• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A recording/reproducing apparatus having an optical pickup device which is efficient in light use having little spherical aberration. The recording and/or reproducing apparatus includes an optical pickup having an objective lens, disposed opposite a disk, having a light passing region divided into central, intermediate and periphery regions corresponding to a near axis area, an intermediate axis area and a far axis area of incident light, where the curvature of the central and peripheral regions is optimized for a thin disk and that of the intermediate region is optimized for a thick disk, a light source irradiating light toward a disk through the objective lens; a photo detector for detecting light reflected from the disk, and a beam splitter, disposed between the objective lens and the light source, for transmitting light from the light source toward the objective lens and for diffracting light reflected from the disks toward the photo detector; and a processing unit to process an information signal to control the incident light generated by the light source, and to process the detected light from the photodetector. Therefore, the optical pickup device can be used for both compact disks (CDs) that are thick using light beam passing the near and intermediate regions of said objective lens, and digital video disks (DVDs) that are thin using light beam passing the near and far axis regions of said objective lens, and detect signals without picking up noise regardless of the thickness of the disk.
    公开号:US20010005352A1
    申请号:US09/789,522
    申请日:2001-02-22
    公开日:2001-06-28
    发明作者:Chul-woo Lee；Jang-hoon Yoo
    申请人:Lee Chul-Woo；Yoo Jang-Hoon；
    IPC主号:G11B7-1374
    专利说明:
    [0001] This application claims the benefit of Korean Application No. 96-3603, filed Feb. 14, 1996, in the Korean Patent Office, the disclosure of which is incorporated herein by reference. [0001]
    [0002] This is a continuation application of U.S. Ser. No. 09/467,385, filed Dec. 21, 1999, now pending; which is a continuation-in-part application of U.S. Ser. No. 09/291,031 filed on Apr. 14, 1999, now pending; which is a continuation of U.S. Ser. No. 08/933,249 filed Sep. 18, 1997, now patented; which is a continuation of U.S. Ser. No. 08/779,521, filed Jan. 7, 1997 now abandoned. [0002] BACKGROUND OF THE INVENTION
    [0003] 1. Field of the Invention [0003]
    [0004] The present invention relates to a recording/reproducing apparatus having an optical pickup device, and more particularly, to a recording/reproducing device having an optical pickup device which enables reading out of information from optical disks having different thicknesses and enables recording information thereon. [0004]
    [0005] In the optical pickup of the recording/reproducing device, an objective lens faces a recording surface of an optical disk for focusing light to record information onto the recording surface of the disk or receiving light reflected from the surface of the disk to read information. [0005]
    [0006] 2. Description of the Related Art [0006]
    [0007] Recently, research on an optical drive has been conducted in which the drive can seat disks having different thicknesses by adopting a lens device including both a hologram lens and a refractive lens. [0007]
    [0008] FIGS. 1 and 2 show focusing states of a conventional optical pickup device of light incident by zero order diffracted light and 1st order diffracted light on a thin disk and a thick disk, respectively. A refractive lens [0008] 2 and a hologram lens 1 are disposed in sequence along an optical path from each of disks 3 a and 3 b. The hologram lens 1 has a lattice pattern 11 for diffracting light that passes through the hologram lens 1. Thus, while light 4 emitted from a light source (not shown) passes through the hologram lens 1, light is divided into a diffracted 1st order light 41 and a non-diffracted zero order light 40, respectively. While the diffracted 1st order light 41 and the non diffracted zero order light 40 pass through each of the objective lenses 2, the light 41 and 40 are focused with different intensities, thereby forming a focus on the thin disk 3 a and on the thick disk 3 b.
    [0009] The lens device described above can record information on disks having different thicknesses and read out information therefrom using zero order light and 1st order light. However, as the incident light is divided into zero order light and 1st order light, the efficiency of light use is lowered. That is, since the incident light is divided into zero order light and 1st order light by the hologram lens [0009] 1, the actual amount of light used for recording information is only 15%. Also, when information is reproduced, information is included in only one of zero order light and 1st order light. Thus, 1st order light or zero order light without information is detected by a photo detector and the detected light may produce noise. The above problem can be overcome by processing the hologram lens of the lens device. However, this requires a high precision process of etching a fine pattern on the hologram, thereby increasing the manufacturing cost. SUMMARY OF THE INVENTION
    [0010] It is an object of the present invention to provide an optical pickup device wherein parts thereof can be manufactured and assembled easily at low cost. [0010]
    [0011] It is another object of the present invention to provide a recording and/or reproducing apparatus which has high efficiency of light use and low spherical aberration. [0011]
    [0012] To achieve the above and other objects, there is provided a recording and/or reproducing apparatus comprising an optical pickup device and a processing unit, wherein the optical pickup device comprises a light source; an objective lens facing a disk having a light passing region divided into central, intermediate and periphery regions respectively corresponding to a near axis area, an intermediate axis area and a far axis area of incident light, wherein the curvature of the central and peripheral regions are optimized for a thin disk and that of the intermediate region is optimized for a thick disk; a photo detector for detecting light reflected from the disk; a beam splitter, disposed between the objective lens and the light source, for transmitting/reflecting light from the light source toward the objective lens and for reflecting/transmitting light reflected from the disks toward the photo detector; and the processing unit processes an information signal to control the incident light generated by the light source, and processes the detected light from the photodetector. [0012] BRIEF DESCRIPTION OF THE DRAWINGS
    [0013] The above and other objects and advantages of the present invention will become more apparent by describing in detail a preferred embodiment thereof with reference to the attached drawings in which: [0013]
    [0014] FIG. 1 is a schematic diagram of a conventional lens device having a hologram lens focusing on a thin disk; [0014]
    [0015] FIG. 2 is a schematic diagram of the lens device of FIG. 1 focusing on a thick disk; [0015]
    [0016] FIG. 3 is a schematic diagram of an optical pickup device according to the present invention; [0016]
    [0017] FIGS. 4 and 5 are perspective and front views of an objective lens adopted into the optical pickup device according to the present invention; [0017]
    [0018] FIG. 6 is a diagram showing an optical path through the objective lens of the optical pickup device according to the present invention; [0018]
    [0019] FIG. 7 is a magnified view of portion A in FIG. 6; [0019]
    [0020] FIG. 8 is a block diagram of a recording/reproducing apparatus for implementing the present invention. [0020] DETAILED DESCRIPTION OF THE INVENTION
    [0021] According to an optical pickup device of the present invention, to prevent the generation of spherical aberration from light of an intermediate area when information is reproduced from a thick disk, such that the intermediate area is located between a near axis area and a far axis area relative to a central optical axis, the curvature of an intermediate region corresponding to the intermediate area of the light is optimized with respect to the thick disk. Also, the light receiving area of a photo detector is limited so that light of the far axis area cannot be reached thereto when information is reproduced from the thick disk. Here, the near axis area represents an area around a central axis of the lens with negligible aberration. Also, the far axis area represents an area relatively far from the optical axis compared with that of the near axis area, and the intermediate area represents an area between the near and far axis areas. [0021]
    [0022] FIG. 8 is a block diagram of a recording/reproducing apparatus for implementing the present invention. The function of the recording/reproducing apparatus for recording/reproducing A/V (audio/video) data using a recordable and rewriteable disk is largely divided into recording and reproduction. [0022]
    [0023] During recording, an AV codec [0023] 110 compression-codes an externally applied AV signal according to a predetermined compression scheme and supplies size information for the compressed data. A digital signal processor (DSP) 120 receives the compressed A/V data supplied from the AV codec 110, adds additional data for error correction code (ECC) processing thereto, and performs modulation using a predetermined modulation scheme. A radio frequency amplifier (RF AMP) 130 converts the modulated data from the DSP 120 into a radio frequency (RF) signal. Then, a pickup 140 records the RF signal supplied from the RF AMP 130 on a disk mounted on a turn table of the pickup 140. A servo 150 receives information necessary for servo control from a system controller 160 and stably performs a servo function for the mounted disk.
    [0024] During playback of information data stored on the disk, the pickup [0024] 140 picks up the optical signal from the disk having the information data stored therein, and the information data is extracted from the optical signal. The RF AMP 130 converts the optical signal into an RF signal, and extracts the servo signal for performing a servo function, and modulated data. The DSP 120 demodulates the modulated data supplied from the RF AMP 130 corresponding to the modulation scheme used during modulation, performs an ECC process to correct errors, and eliminates added data. The servo unit 150 receives information necessary for servo control from the RF AMP 130 and the system controller 160, and stably performs the servo function. The AV codec 110 decodes the compressed A/V data supplied from the DSP 120 to output an A/V signal. The system controller 160 controls the overall system for reproducing and recording the information data from and on the disk mounted on the turn table of the pickup 140.
    [0025] FIG. 3 is a schematic diagram of an optical pickup device used in the pickup [0025] 140 according to the present invention. Like a general optical pickup device, an objective lens 20, a beam splitter (separation unit) 60 and a detecting lens 40 are disposed in sequence on an optical path between a disk 30 and a photo detector 90, and a light source 80 is located on another optical path from the beam splitter 60. The disk 30 may either be a thin (digital video) disk 30 a or a thick (compact) disk 30 b.
    [0026] In the optical pickup device having the above structure according to the present invention, FIGS. 4 and 5 show perspective and front views of the objective lens [0026] 20, respectively. The reference symbol WDD denotes the distance between the objective lens and the thin disk 30 a, and WDC denotes the distance between the objective lens and the thick disk 30 b. That is, in a reading or writing operation, the working distance for the thin disk 30 a is larger than that for the thick disk 30 b.
    [0027] The objective lens [0027] 20 has a doughnut- or ring-shaped intermediate region A2 on at least one side, having an outer diameter which is less than the total significant light passing area diameter. Also, a central region A1 and a periphery region A3 are placed inside and outside of the intermediate region A2, respectively. Here, the curvatures of the central and peripheral regions A1 and A3 are optimized for a thin digital video disk (DVD), and that of the intermediate region A2 is optimized for a thick compact disk (CD). Also, depending on circumstances, the intermediate region A2 may be divided into a plurality of subregions. Preferably, the photo detector 90 is designed for only receiving light passed through the central and intermediate regions A1 and A2 of the objective lens 20 when information is reproduced from the thick disk, in which light of the far axis area is not detected by the photo detector 90. The central region A1 is a circular region, the intermediate region A2 is a first disk-shaped region and the periphery region A3 is a second disk-shaped region.
    [0028] Thus, as shown in FIGS. 6 and 7, when information is reproduced from the thick CD [0028] 30 b, only light inside the dashed line is focused on the thick CD 30 b. Here, since light of the near axis area passes through the objective lens, less spherical aberration is generated, even though the curvature of the central region A1 corresponding to the near axis area is optimized for the thin DVD 30 a. Also, when reproducing information from the thin DVD 30 a, light passes through the central and peripheral regions A1 and A3 whose curvature is optimized for the thin DVD 30 a, thereby forming a focus on a surface including information of the thin DVD 30 a.
    [0029] When a numerical aperture (NA) of the regions corresponding to the near and intermediate axis areas is less than 0.4, a small focus can be formed on the thick CD [0029] 30 b, wherein the small focus is optimized for the CD disk. According to experimentation, it is preferable that the width of the ring-shaped intermediate region is greater than 50 μm from the thin DVD 30 a for a stable reproducing characteristic. Also, the data of the objective lens 20 for each region which is optimized for the CD and DVD are summarized in Tables 1 and 2, respectively.
    [0030] Table 1 shows lens data at the intermediate region A[0030] 2 which is optimized for the thick CD 30 b, and Table 2 shows lens data at the central and periphery regions A1 and A3 optimized for a thin DVD 30 a. In these tables, the references to “front,” “back,” and “disk” represent the front surface of the objective lens 20, the back surface of the objective lens 20 and the surface of the disk, respectively. That is, in Table 1, the data for the curved surfaces “front,” “back,” and “disk” refer to the data of the front surface of the objective 20 lens at the intermediate region A2, the back surface of the lens at the intermediate region A2, and the surface of the thick CD 30 b, respectively, and in Table 2, the data for the curved surfaces “front,” “back,” and “disk” refer to the data of the front surface of the objective lens 20 at the central and periphery regions A1 and A3, the back surface of the lens at the central and periphery regions, and the surface of the thin DVD 30 a, respectively.
    [0031] As described above, according to the optical pickup device of the present invention, the thick CD and the thin DVD can be compatibly adopted and a signal can be detected without picking up noise regardless of the thickness of the disk. Also, the objective lens can be manufactured easily by a general compression or injection molding, thereby reducing manufacturing costs. [0031] TABLE 1 Data at the intermediate region of the objective lens Curved Refractive Aspherical Surface Curvature Thickness Index Coefficient front  2.40632 2.600000 1.505 K = 0.00000 A = −3.51258E-03 B = −6.19938E-04 C = −2.32191E-04 D = 0.00000 back −5.11700 1.563295 1.580 K = −24.72000 A = 4.46350E-03 B = −3.69750E-03 C = 8.23880E-04 D = −7.45950E-05 disk ∞ 1.200000 1.550 Not Applicable
    [0032] [0032] TABLE 2 Data at the central and periphery regions Curved Refractive Aspherical Surface Curvature Thickness Index Coefficient front  2.09200 2.600000 1.505 K = −0.872110 A = 4.79500E-03 B = 6.25260E-05 C = 1.24380E-05 D = −1.76880E-04 back −5.11700 1.563295 K = −24.72000 IC: Yes CUF = 0.000000 A = 4.46350E-03 B = −3.69750E-03 C = 8.23880E-04 D = −7.45950E-05 disk ∞ 0.600000 1.550 Not Applicable
    权利要求:
    Claims (11)
    [1" id="US-20010005352-A1-CLM-00001] 1. A method of focusing a light source onto an optical memory medium in an optical device compatible with different types of optical memory media, said method comprising the steps of:
    generating an information signal to control emission of a light from a light emitting source;
    focusing a first portion of said light onto said optical memory medium independent of a type of said optical memory medium;
    focusing a second portion of said light onto said optical memory medium if said optical memory medium is a first predetermined type;
    focusing a third portion of said light onto said optical memory medium if said optical memory medium is a second predetermined type; and
    processing the first through third portions of said light;
    wherein a first working distance between an objective lens and a near surface of said optical memory medium of said first predetermined type having a first thickness is greater than a second working distance between said objective lens and a near surface of said optical memory medium of said second predetermined type having a second thickness greater than the first thickness.
    [2" id="US-20010005352-A1-CLM-00002] 2. The method as claimed in
    claim 1 , wherein only said first and second portions of said light are focused onto said optical memory medium if said optical memory medium is said first predetermined type and only said first and third portions of said light are focused onto said optical memory medium if said optical memory medium is said second predetermined type.
    [3" id="US-20010005352-A1-CLM-00003] 3. The method as claimed in
    claim 1 , wherein a thickness of said first predetermined type is greater than a thickness of said second predetermined type.
    [4" id="US-20010005352-A1-CLM-00004] 4. The method as claimed in
    claim 2 , wherein said first predetermined type is a compact disk and said second predetermined type is a digital video disk.
    [5" id="US-20010005352-A1-CLM-00005] 5. A recording and/or reproducing apparatus device compatible with disks having different thicknesses, comprising:
    an optical pickup device comprising
    a light source to emit a light beam,
    an objective lens to focus the light beam on the disks having the different thicknesses, and
    a photo detector to detect the light beam reflected from the disks having the different thicknesses; and
    a processing unit to process an information signal to control the light generated by the light source, and to process the detected light from the photo detector;
    wherein a first working distance between the objective lens and a near surface of a first one of the disks having a first thickness is greater than a second working distance between the objective lens and a near surface of a second one of the disks having a second thickness greater than the first thickness.
    [6" id="US-20010005352-A1-CLM-00006] 6. The recording and/or reproducing apparatus as claimed in
    claim 5 , wherein the objective lens has at least one region to focus the light beam onto the disks independent of the thicknesses of the disks.
    [7" id="US-20010005352-A1-CLM-00007] 7. The recording and/or reproducing apparatus as claimed in
    claim 5 , wherein a first working distance between the objective lens and a near surface of a first one of the disks having a first thickness is greater than a second working distance between the objective lens and a near surface of a second one of the disks having a second thickness greater than the first thickness.
    [8" id="US-20010005352-A1-CLM-00008] 8. A recording and/or reproducing apparatus device compatible with disks having different thicknesses, comprising:
    an objective lens to focus a light beam on the disks having the different thicknesses, wherein the objective lens has a ring region;
    a processing unit to process an information signal to control the light beam transmitted to said objective lens, and to process the light beam reflected from said one optical memory medium and transmitted through said objective lens;
    wherein a first working distance between the objective lens and a near surface of a first one of the disks having a first thickness is greater than a second working distance between the objective lens and a near surface of a second one of the disks having a second thickness greater than the first thickness.
    [9" id="US-20010005352-A1-CLM-00009] 9. The recording and/or reproducing apparatus as claimed in
    claim 8 , wherein the ring region has a different optical characteristic from regions of the objective lens other than the ring region.
    [10" id="US-20010005352-A1-CLM-00010] 10. A recording and/or reproducing apparatus device compatible with disks having different thicknesses, comprising:
    an optical pickup device comprising
    a light source to emit a light beam,
    an objective lens to focus the light beam on the disks having the different thicknesses, wherein the objective lens has at least one region to focus the light beam onto the disks independent of the thicknesses of the disks, and
    a photo detector to detect the light beam reflected from the disks having the different thicknesses; and
    a processing unit to process an information signal to control the light beam generated by the light source, and to process the detected light beam from the photo detector;
    wherein a first working distance between the objective lens and a near surface of a first one of the disks having a first thickness is greater than a second working distance between the objective lens and a near surface of a second one of the disks having a second thickness greater than the first thickness.
    [11" id="US-20010005352-A1-CLM-00011] 11. A recording and/or reproducing apparatus compatible with optical memory media of different thicknesses, comprising:
    an objective lens having at least one region which focuses light onto one of the optical memory media independent of the thickness of the one optical memory medium; and
    a processing unit to process an information signal to control the light beam transmitted to said objective lens, and to process the light beam reflected from said one optical memory medium and transmitted through said objective lens;
    wherein a first working distance between the objective lens and a near surface of a first one of the optical memory media having a first thickness is greater than a second working distance between the objective lens and a near surface of a second one of the optical memory media having a second thickness greater than the first thickness.
    类似技术:
    公开号 | 公开日 | 专利标题
    US8848502B2|2014-09-30|Recording/reproducing apparatus having an optical pickup device to read from and record information to disks of different thicknesses
    US5737294A|1998-04-07|Objective lens with two numerical apertures for reading/writing two optical discs
    US6285646B1|2001-09-04|Optical pickup using objective lens compatible with a plurality of optical disks
    US5909424A|1999-06-01|Optical pickup device and method to read from and record information to disks of different thicknesses
    CN1162851C|2004-08-18|Objective glass, reproducing apparatus and method thereof
    JP2002025094A|2002-01-25|Pickup device
    US5892748A|1999-04-06|Optical pickup for reading or recording information on a recording surface
    KR100670968B1|2007-01-17|Optical head and optical disc device
    US7170844B2|2007-01-30|Optical pick-up apparatus and correction lens for use in the apparatus
    JP3919276B2|2007-05-23|Optical head and optical disk apparatus
    US6023449A|2000-02-08|Optical pickup for adjusting focus error signal offset and having widely separated photodetector elements
    US7079471B1|2006-07-18|Optical pickup using two laser beam sources of different wavelengths for an optical disk drive and a converter to optimize a light beam reflected off an optical disc for detection based on reflected light beam wavelength
    JP3896617B2|2007-03-22|Optical pickup device
    EP0786766A2|1997-07-30|Optical pickup device and reproducing apparatus for optical recording medium
    US6639889B1|2003-10-28|Recording/reproducing apparatus including an optical pickup having an objective lens compatible with a plurality of optical disk formats
    JP3277140B2|2002-04-22|Objective lens and optical pickup device
    KR20050046591A|2005-05-18|Optical pick-up
    KR100265734B1|2000-09-15|Compatible optical pickup apparatus
    KR100255308B1|2000-05-01|Optical pick-up
    JP3396608B2|2003-04-14|Optical recording / reproducing device
    JPH09251661A|1997-09-22|Recording and reproducing device and method
    KR100423853B1|2004-07-07|Optical Disc Player
    KR100682689B1|2007-02-15|Optical pick up having a multiple light emitting devices
    KR100234254B1|2000-01-15|High density recording/reproducing pickup for multi-type disc
    KR20020065156A|2002-08-13|Tilt detecting method in an optical pickup
    同族专利:
    公开号 | 公开日
    US20030193877A1|2003-10-16|
    US6259668B1|2001-07-10|
    US20030002402A1|2003-01-02|
    US8503272B2|2013-08-06|
    US8848502B2|2014-09-30|
    US6882614B2|2005-04-19|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2233591A|1937-09-24|1941-03-04|Dulovits Jeno|Soft effect screen lens|
    US3305294A|1964-12-03|1967-02-21|Optical Res & Dev Corp|Two-element variable-power spherical lens|
    US4074314A|1973-10-01|1978-02-14|U.S. Philips Corporation|Apparatus for optically reading a record carrier and correcting focus error|
    US3958884A|1974-04-24|1976-05-25|Vickers Limited|Interferometric apparatus|
    US4210391A|1977-09-14|1980-07-01|Cohen Allen L|Multifocal zone plate|
    US4266534A|1977-10-08|1981-05-12|Olympus Optical Co., Ltd.|Illumination unit for endoscope|
    US4545653A|1981-01-07|1985-10-08|Digital Recording Corporation|Focusing elements and system for producing a prescribed energy distribution along an axial focal zone|
    US4566762A|1982-09-02|1986-01-28|Nippon Kogaku K.K.|Dual focus optical system|
    US4501493A|1982-10-28|1985-02-26|Sony Corporation|Apparatus for detecting a position of an optical pickup|
    US4733943A|1982-11-17|1988-03-29|Pioneer Electronic Corporation|Pickup for optical disc|
    US4612437A|1983-02-10|1986-09-16|Sony Corporation|Focussing error detecting apparatus for use in an optical disc reproducing device, an auto-focus camera or image-pickup device|
    US4741605A|1983-03-29|1988-05-03|Ab Svensk Filmindustri|Multifocal objective|
    US4631397A|1983-05-31|1986-12-23|Sony Corporation|Focussing error detecting apparatus employing a composite lens|
    US5142411A|1987-09-24|1992-08-25|Werner J. Fiala|Multifocal birefringent lens system|
    US4904856A|1987-12-09|1990-02-27|Sharp Kabushiki Kaisha|Optical pickup device with diffraction sensing|
    US4918679A|1988-01-21|1990-04-17|U.S. Philips Corporation|Optical record carrier scanning apparatus providing optoelectronic positioning of the scanning spot|
    US5195072A|1988-03-25|1993-03-16|Tosoh Corporation|Error detecting device for optical head|
    US4938573A|1988-07-05|1990-07-03|Olympus Optical Co., Ltd.|Objective lens system|
    US4995715A|1988-07-20|1991-02-26|Cohen Allen L|Diffractive multifocal optical device|
    US5161148A|1988-08-05|1992-11-03|Matsushita Electric Industrial Co., Ltd.|Optical pick-up using wavelength guide with grating coupler therein|
    US4995714A|1988-08-26|1991-02-26|Cohen Allen L|Multifocal optical device with novel phase zone plate and method for making|
    US5161040A|1989-01-30|1992-11-03|Seiko Epson Corporation|Optical system with aberration suppression and optical head utilizing the same|
    US5120120A|1990-07-27|1992-06-09|Cohen Allen L|Multifocal optical device with spurious order suppression and method for manufacture of same|
    US5235581A|1990-08-09|1993-08-10|Matsushita Electric Industrial Co., Ltd.|Optical recording/reproducing apparatus for optical disks with various disk substrate thicknesses|
    US5153778A|1991-06-19|1992-10-06|At&T Bell Laboratories|Powerless field-corrective lens|
    US5164584A|1991-06-24|1992-11-17|Ncr Corporation|Optical scanner with power efficient lens|
    US5737300A|1991-09-07|1998-04-07|Fuji Xerox Co., Ltd.|Optical dish device|
    US5438187A|1991-11-01|1995-08-01|Spectra-Physics Scanning Systems, Inc.|Multiple focus optical system for data reading applications|
    US5303221A|1992-06-10|1994-04-12|Pioneer Electronic Corporation|Optical pickup for an optical disc reproducing system|
    US5583843A|1992-06-26|1996-12-10|Matsushita Electric Industrial Co., Ltd.|Compound holographic optical element with two superposition hologram patterns for converging and diffracting a light beam|
    US5446565A|1993-02-01|1995-08-29|Matsushita Electric Industrial Co., Ltd.|Compound objective lens having two focal points|
    US5815293A|1993-02-01|1998-09-29|Matsushita Electric Industrial Co., Ltd.|Compound objective lens having two focal points|
    US5349471A|1993-02-16|1994-09-20|The University Of Rochester|Hybrid refractive/diffractive achromatic lens for optical data storage systems|
    US5473471A|1993-04-16|1995-12-05|Matsushita Electric Industrial Co., Ltd.|Complex lens with diffraction grating|
    US5612942A|1993-11-19|1997-03-18|Nec Corporation|Optical head|
    US5615199A|1993-12-20|1997-03-25|Hitachi, Ltd.|Optical head apparatus|
    US5930214A|1994-01-19|1999-07-27|Kabushiki Kaisha Toshiba|Recording/reproducing optical head apparatus compatible with different optical media|
    US5703856A|1994-08-12|1997-12-30|Matsushita Electric Industrial Co., Ltd.|Optical head and optical data recording and reproducing apparatus having the same|
    US5526338A|1995-03-10|1996-06-11|Yeda Research & Development Co. Ltd.|Method and apparatus for storage and retrieval with multilayer optical disks|
    US5708638A|1995-03-15|1998-01-13|U.S. Philips Corporation|Device for optically scanning a recording medium by focusing the best focus or the paraxial focus to the information layer|
    US5754512A|1995-05-30|1998-05-19|Matsushita Electric Industrial Co., Ltd.|Correction elements to lower light intensity around an optical axis of an optical head with a plurality of focal points|
    US5696750A|1995-06-05|1997-12-09|Nec Corporation|Optical head apparatus for different types of disks|
    US5703862A|1995-06-07|1997-12-30|Samsung Electronics Co., Ltd.|Dual focus objective lens with two curvatures for focussing light on two different kinds of disks with different thicknesses|
    US5986779A|1995-08-18|1999-11-16|Matsushita Electric Industrial Co., Ltd.|Multiple focus lens, an optical head apparatus and an optical information recording-reproducing apparatus|
    US5665957A|1995-08-30|1997-09-09|Samsung Electronics Co., Ltd.|Lens device comprising light blocking means and an optical pickup apparatus using the lens device|
    US5587981A|1995-09-05|1996-12-24|Kamatani; Yasuo|Multi-standard optical disk reading method having distinction process|
    US5802037A|1995-10-04|1998-09-01|Samsung Electronics Co., Ltd.|Optical detector with two detecting regions for reproducing and recording information on two kinds of disks having different thicknesses|
    US5724335A|1995-10-25|1998-03-03|Konica Corporation|Objective lens for recording and reproducing for use in an optical information recording medium|
    US5790503A|1995-11-22|1998-08-04|Matsushita Electric Industrial Co., Ltd.|Optical head|
    US5768031A|1995-12-01|1998-06-16|Lg Electronics Inc.|Objective lens|
    US5835283A|1996-01-19|1998-11-10|Nec Corporation|Condenser lens for optical disks|
    US5777803A|1996-02-23|1998-07-07|Industrial Technology Research Institute|Objective lens for optical pick-up head of optical disk drive|
    US6052237A|1996-03-08|2000-04-18|U.S. Philips Corporation|Objective lens and scanning device using such an objective lens|
    US5796683A|1996-03-26|1998-08-18|Sanyo Electric Co., Ltd.|Magneto-optical recording device having a controllable polarizing filter|
    US5917800A|1996-04-26|1999-06-29|Daewoo Electronics Co., Ltd.|Optical pickup device for reproducing discs of two types with different densities by double beam focuses of different sizes|
    US5659533A|1996-07-23|1997-08-19|Sampo Corporation|Method of using a single pick-up head to read and store data on discs of different thicknesses and structure of a pick-up head apparatus therefor|
    US6061324A|1996-10-23|2000-05-09|Konica Corporation|Method for recording/reproducing optical information recording medium, optical pickup apparatus, objective lens and design method of objective lens|
    US6091691A|1997-02-13|2000-07-18|Samsung Electronics Co., Ltd.|Optical pickup having an objective lens compatible with a plurality of optical disk formats|
    GB508448A|1937-09-24|1939-06-30|Jeno Dulovits|Improvements in soft effect attachments for use with photographic objectives|
    DE726352C|1939-09-14|1942-10-12|Sendlinger Optische Glaswerke|Magnifying glass|
    JPS6273429A|1985-09-26|1987-04-04|Toshiba Corp|Position detector for optical pickup|
    JPH0315003A|1989-03-16|1991-01-23|Omron Corp|Grating lens and light converging grating coupler|
    JPH0429048B2|1989-05-01|1992-05-15|Sankyo Seiki Seisakusho Kk||
    JPH03244450A|1990-02-23|1991-10-31|Nidek Co Ltd|Two-focus artificial lens|
    US5281797A|1991-12-26|1994-01-25|Hitachi, Ltd.|Short wavelength optical disk head having a changeable aperture|
    US5281979A|1992-11-04|1994-01-25|Eastman Kodak Company|Laser printer calibration|
    JP2559006B2|1993-01-13|1996-11-27|松下電器産業株式会社|Optical head|
    JP2559011B2|1993-08-25|1996-11-27|松下電器産業株式会社|Optical head|
    US5729510A|1994-01-19|1998-03-17|Kabushiki Kaisha Toshiba|Optical head used for recording on optical recording medium having various thicknesses, warpage and the like|
    JP3435249B2|1994-03-11|2003-08-11|株式会社東芝|Optical head device and lens|
    JPH08203115A|1995-01-26|1996-08-09|Matsushita Electric Ind Co Ltd|Optical system|
    JP2995003B2|1995-05-08|1999-12-27|三洋電機株式会社|Optical playback device|
    KR100373673B1|1995-05-08|2003-05-09|산요 덴키 가부시키가이샤|Optical recording and playback device and optical pickup|
    KR100234248B1|1995-06-07|1999-12-15|윤종용|Dual focusing objective lens for optical pickup|
    ES2323629T3|1995-08-30|2009-07-22|Samsung Electronics Co., Ltd.|LENS DEVICE AND OPTICAL RECEIVING DEVICE USING THE LENS DEVICE.|
    US5907530A|1995-08-30|1999-05-25|Samsung Electronics Co., Ltd.|Optical pickup device|
    KR970012379A|1995-08-31|1997-03-29|배순훈|Dual Focus Optical Pickup|
    KR970017245A|1995-09-29|1997-04-30|배순훈|Dual Focus Optical Pickup|
    JPH09120623A|1995-10-24|1997-05-06|Sony Corp|Apparatus for detecting thickness and warp of optical disk|
    US5838502A|1995-11-15|1998-11-17|Lg Electronics Inc.|Objective lens for optical pickup apparatus|
    JPH09145994A|1995-11-24|1997-06-06|Konica Corp|Objective lens for recording and reproducing optical information recording medium|
    JP3553241B2|1995-11-24|2004-08-11|シャープ株式会社|Optical disk drive|
    JPH09145995A|1995-11-27|1997-06-06|Konica Corp|Optical system for recording and reproducing optical information recording medium|
    KR0166233B1|1995-11-27|1999-03-20|배순훈|Subminiature dual focus optical pick-up device|
    KR100269105B1|1995-12-07|2000-10-16|윤종용|Recording and reproducing optical pickup for various thickness disc|
    JP4006032B2|1995-12-28|2007-11-14|株式会社日立製作所|Objective lens and optical head|
    KR100238266B1|1996-02-14|2000-02-01|윤종용|Optical device|
    KR100230253B1|1996-02-14|1999-11-15|윤종용|Object lens device and manufacturing method thereof and optical pickup using it|
    US5867468A|1996-03-11|1999-02-02|Matsushita Electric Industrial Co., Ltd.|Optical pickup with a vertically movable aperture means|
    KR0176595B1|1996-04-30|1999-04-15|김광호|Objective lens device and optic pick-up device using objective lens device|
    KR100189910B1|1996-05-15|1999-06-01|윤종용|Optical pickup|
    JP3426084B2|1996-05-24|2003-07-14|シャープ株式会社|Optical recording / reproducing device|
    US5809000A|1996-05-31|1998-09-15|Daewoo Electronics, Co., Ltd.|Optical pickup system for reading optical disks of different thicknesses|
    KR0185953B1|1996-06-29|1999-04-15|김광호|Method for discriminating dvd or cd of dvd system|
    KR980011158A|1996-07-31|1998-04-30|배순훈|Optical pick-up device|
    US5883874A|1996-07-31|1999-03-16|Daewoo Electronics Co., Ltd.|Optical pickup system for selectively reading a multiple number of optical disks|
    KR100209916B1|1997-02-13|1999-07-15|윤종용|Optical pickup for various disc specification|
    KR100514323B1|1997-12-05|2005-12-08|삼성전자주식회사|Optical pickup with objective lens compatible with multiple optical discs|
    US6088322A|1998-05-07|2000-07-11|Broome; Barry G.|Single objective lens for use with CD or DVD optical disks|US6449235B1|1998-04-04|2002-09-10|Lg Electronics, Inc.|Optical pick-up apparatus and optical recording/reproducing apparatus using the same|
    JP2002092934A|2000-07-08|2002-03-29|Samsung Electronics Co Ltd|Compatible type optical pickup device using single light source|
    TW556178B|2000-10-26|2003-10-01|Konishiroku Photo Ind|Optical pickup apparatus and objective lens|
    CN101221782B|2002-02-26|2010-09-22|松下电器产业株式会社|Optical element and optical head device using the same|
    JP2003322793A|2002-05-08|2003-11-14|Pentax Corp|Objective lens for optical head|
    JP2005209295A|2004-01-23|2005-08-04|Sankyo Seiki Mfg Co Ltd|Optical head device|
    KR20070103877A|2006-04-20|2007-10-25|삼성전자주식회사|Compatible optical pickup apparatus having high efficiency and optical recording and/or reproducing employing the same|
    US20080019232A1|2006-07-21|2008-01-24|Samsung Electronics Co., Ltd.|Object lens and optical pick-up device having the same|
    KR101312633B1|2007-04-04|2013-10-04|삼성전자주식회사|Hologram optical device and compatible optical pickup and optical information storage medium system employing the same|
    法律状态:
    2006-04-04| CC| Certificate of correction|
    2008-09-24| FPAY| Fee payment|Year of fee payment: 4 |
    2012-09-24| FPAY| Fee payment|Year of fee payment: 8 |
    2016-11-25| REMI| Maintenance fee reminder mailed|
    2017-04-19| LAPS| Lapse for failure to pay maintenance fees|
    2017-05-15| STCH| Information on status: patent discontinuation|Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
    2017-06-06| FP| Expired due to failure to pay maintenance fee|Effective date: 20170419 |
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960003603A|KR100238266B1|1996-02-14|1996-02-14|Optical device|
    KR96-3603||1996-02-14||
    US77952197A| true| 1997-01-07|1997-01-07||
    US08/933,249|US5909424A|1996-02-14|1997-09-18|Optical pickup device and method to read from and record information to disks of different thicknesses|
    US09/291,031|US6147955A|1996-02-14|1999-04-14|Optical pickup device to read from and record information to disks of different thicknesses|
    US09/467,385|US6259668B1|1996-02-14|1999-12-21|Recording/reproducing apparatus having an optical pickup device to read from and record information to disks of different thicknesses|
    US09/789,522|US6882614B2|1996-02-14|2001-02-22|Recording/reproducing apparatus having an optical pickup device to read from and record information to disks of different thicknesses|US09/789,522| US6882614B2|1996-02-14|2001-02-22|Recording/reproducing apparatus having an optical pickup device to read from and record information to disks of different thicknesses|
    US10/225,177| US8503272B2|1996-02-14|2002-08-22|Recording/reproducing apparatus having an optical pickup device to read from and record information to disks of different thicknesses|
    US10/441,111| US8848502B2|1996-02-14|2003-05-20|Recording/reproducing apparatus having an optical pickup device to read from and record information to disks of different thicknesses|
    [返回顶部]