• 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:
    FIELD: electronic reproduction technique. The purpose of the invention is to achieve a high intensity and uniform illumination of a color original. An optoelectronic reader for progressive reading of images of color originals contains a color original 1, a flat lens 2, a macroobject 3, a row of photodiodes 4, a light source 5, a condenser 6, a rotating wheel with filters 7, a collimator 8, a fiber-optic converter 9, input and output 10 and 11 surfaces, a cylindrical lens 12, color separation filters 13. The light flux from the light source enters the rotating wheel with filters, having several filters for (color) decomposition of light into ko colors, the fiber-optic cross-section transducer, the output cross-section of which
    公开号:SU1743377A3
    申请号:SU874202495
    申请日:1987-04-30
    公开日:1992-06-23
    发明作者:Гебхардт Аксель
    申请人:Др. -Инж. Рудольф Хелль Гмбх (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to an optoelectric-1 device for progressive scanning of color originals in the reproduction technique by a light source, the light of which through a filter wheel enters a fiber-optic transducer cross section.
    The purpose of the invention is to achieve a high intensity and uniformity of illumination of a color original, as well as reading opaque color originals.
    FIG. 1 and 2 shows a functional diagram of the device, options; in fig. 3 - the same section; in fig. 4 - the same, top view; in fig. 5 and 6 - the same options; in fig. 7 - scanning device, cross section; in fig. 8 and 9 - rotating wheel with filters; in fig. 10 and 11 show a modification of the device for illuminating a transparent material with a two-stage image; in fig. 12 and 13 is a variant of the ray path of the scanning device upon insertion of a cylindrical lens; in fig. 14 is a graph of spectral sensitivity curves for R, G, B.
     An optoelectronic reader for progressive reading of images of color originals contains a color original 1, a flat lens 2, a macro lens 3, an optoelectronic converter containing a series of photodiodes 4, a light source 5, a condenser 6, a rotating wheel with filters 7, a collimator 8, a fiber optic converter 9 with input 10 and output 11 surfaces; cylindrical lens 12, color separation filters 13. The device (Fig. 3) contains cylindrical lenses 14 and 15, fiber line 16-18. The device (Fig. 5) contains
    light source 5, condenser 6, rotating wheel with filters 7, cylindrical lens 12, color original 1.
    The device in FIG. 10 and 11 contains
    fiber line 18, a cylindrical lens 12, a translucent screen 19, a second cylindrical lens 20. FIG. 12 shows a variant of the device for inserting an additional Fresnel lens 21, comprising a beam of rays 22, a fiber line 18, a separate beam 23, a diffusing screen 24, a secondary beam 25.
    The light source 5 in the form of a halogen lamp, for example, 0.5 A, 12 V, 50 W, creates
    White light. Condenser 6 focuses the image of the helix on a rotating filter wheel with filters containing an interference filter, as well as a fitted mass filter to obtain primary colors (R, G, B). This image of the helix on the filter is particularly rational, since this achieves a high efficiency of the filter wheel. Light is collimated by a lens and fed to a round
    cross-section of a fiber-optic cross-section converter (line circumference). The outputs of the fibers formed to the cross section converter line are depicted with
    using a cylindrical lens (PMMA) on the illuminated original, a line of light appears in the form of a light strip, due to which cyclical occurs due to a rotating filter wheel with filters
    Illumination of the original primary colors. Possible opaque and transparent lighting (Fig. 10).
    In the invention, xenon lamps can be used as a light source, and instead of a filter wheel, an adjustable acoustic-optical filter. AT
    A scanner for a high resolution scanner uses one-dimensional lines of photodiodes. Linear lines of photodiodes provide up to 5,000 image elements in length, while two-dimensional photodiode complexes (ODS — Arrays are consistent with the television standard (for example, Fairchlld SSD 211, 488x3800 images).
    For the proposed device, the use of a fiber optic transducer of the cross section, since taking into account a point source of light (halogen lamp, xenon arc lamp), a light line can be obtained with a linear shape. The light of a point source of light can simply cyclically switch with the color filters, and thus, when scanning a color image, it is bypassed with only one line of photodiodes. The optical efficiency is significantly higher with progressive illumination than with illumination on a plane, the signal-to-noise ratio (the effect of light scattering) is improved compared to illumination on a plane, and the correction of lighting irregularities depending on the image location, such as marginal light attenuation, scanning vignetting lens, less expensive than a two-dimensional device.
    The lighting device (Fig. 7) may consist of a lamp unit with a light source, a condenser b, an infrared barrier filter, a rotating wheel 7 with filters, a collimator 8 that gives light to the input cross section of the transducer 9 of the cross section, whose input cross section is matched with diameter of the light beam. For reasons of optimal use of light, the lamp housing can be mirrored to the light source 5 in order to simultaneously illuminate two fiber optic transducers 9 of the cross section.
    Due to the condenser 6 with a diaphragm number of about one in between the intermediate image, the lamp coil is increased approximately three times on the rotating wheel with filters 7. The collimator 8 collimates the light beam so that the beam has a uniform density of light and easily fills the input of the cross section converter.
    The surface 11 of the input transducer cross-section varies in size, depending on the length of the scanned line (opaque / transparent). By choosing the focal length of the collimator 8
    the beam diameter is matched with the diameter of the transducer cross section.
    Rotating wheel 7 with filters (Fig. 8 and 9) consists of three sectors at 120 °
    minus the edges of the filter holders. The filter wheel sectors contain color separation filters 13 (red, green, blue), and additional mass filters, i.e. colored glasses that are common
    spectral absorption is consistent with those known on the original.
    FIG. 12 and 13 show another rational design of the device, consisting in the insertion of a field lens. With
    large field angles of view (in the space of the inventions) decrease the image brightness due to the vignetting of the scanning lens and the illumination. Using a field lens, i.e. Frenel's cylindrical lens 21 can compensate for this decrease in luminance at the edges of the image. The course of the rays makes it obvious by the example of a beam of 22 rays, which comes out of the fiber line 18, this principle of operation. A separate beam 29 from the beam 22 is scattered on the diffusing screen 24 into the secondary beam 25. This beam is focused by a cylindrical lens 12 on the original 1 and at the same time
    cylindrical lens 2 Fresnel deflected to the pupil of the scanning optical system. A separate beam 22 without lens 21 does not fall on the pupil of the scanning optical system, which does not occur
    dimming at the edge of the image. In addition, a wide band of the original is highlighted by a separate light guide, due to which overlap is obtained in the original, the averaging is also obtained
    the luminance of a large number of light guides, which leads to a more uniform display inside the scanned line.
    FIG. 14 shows the v (A) filter characteristics for obtaining spectral portions of red, green, blue from white light. At the same time, the characteristics of the filter were matched with the sensitivity characteristics of the row of photodiodes. For red, green, blue, dichroic filters are used during color scanning, to which filter filters are connected in parallel to correct the filter characteristics. colored glass. To correct the amplitudes of red, green, blue to the same height, if necessary, a neutral filter is additionally connected in parallel, for which conventional neutral glasses are used.
    When reproducing a color original in black and white, a single filter with a characteristic corresponding to the sensitivity of the eye is used instead of color filters. This characteristic is also called the V (I) -characteristics and is presented as a function. This allows for the correct transmission of tones in black and white reproduction.
    The advantage of an optoelectronic reading device is that it bypasses one line of photodiodes, and also that other optical nodes, other than the filter wheel, should not move. In addition, the device provides uniform illumination of the line at the edges of the lines with significant light output, t . high efficiency is provided. Both color reproduction and black and white are possible, as well as both opaque and transparent scanning of large originals. You can use the same optical unit for these different purposes during production. Instead of a macro lens, a GRIN is used — a fiber-optic system in combination with a row of photodiodes that has the length of the scanned string. Thanks to this device, an extremely compact design is possible.
    When using rows of photodiodes that already decompose the color, there may be no filter wheel. With these lines of photodiodes, several photodiodes are matched with each image element, which, due to the anticipation of the corresponding dichroic filters, provides the desired color signals.
    权利要求:
    Claims (9)
    [1]
    Claim 1. Optoelectronic reader for progressive reading of images of color originals, containing optoelectronic converter located on one optical axis, consisting of a row of photodiodes for receiving light transmitted or reflected by a color original, light source, color separation filters, fiber-optic converter cross section, located between the light source and the color original, the output surface of the cross section converter being ene in a color original, and fiber cross-section converter exit surface oriented in a linear optic device, characterized in that, in order to achieve high intensity and uniformity of illumination on the color original traveling path of the light flux from
    light source to the row of photodiodes; a condenser, a collimator, a cylindrical lens, a macro lens are introduced, and color separation filters are made in
    as a rotating wheel with filters, a condenser is located between the light source and filters for separating colors, a collimator between a rotating wheel with filters and the entrance surface of the cross section former, a cylindrical lens between the entrance surface of the cross section converter and a color original, a macro lens between the color original and
    5 by an optoelectronic converter made as a series of photodiodes, a color original between a cylindrical lens and a macro lens, the cross section of the input surface of the transducer matching with the cross section of the beam of light coming out of the collimator, the cylindrical lens extending along the entire length of the output surface of the transducer of the cross section , but
    5 color separation filters of the rotating wheel with filters are spectrally matched with photodiodes with white and transparent originals.
    [2]
    2, An optoelectronic reading device for progressively reading images of color originals, containing an optoelectronic converter located on the same optical axis, consisting of a series of photodiodes for receiving the light transmitted by or transmitted by the color original, a light source, color separation filters, a fiber optic transducer located between the light source and the color
    0, the output surface of the cross section converter is directed to the color original, and the fiber optic cross section converter in the output surface is oriented to a linear fiber device, characterized in that, in order to achieve high color and uniform illumination of the color original along the path light
    0 from the light source to the photodiode row, a condenser, collimator, cylindrical lens, macro lens are inserted, the condenser and collimator being located between the light source and the output surface
    5 fiber optic transducer cross section, a cylindrical lens - between the output surface of the fiber optic transducer cross section and a color original, macro lens and color separation filters - between
    a color original and a series of photodiodes of an optoelectronic converter, and a color original between a cylindrical lens and a macro lens, the cross section of the input surface of the fiber optic converter matched with the cross section of the light rays emanating from the collimator, the cylindrical lens is located throughout the entire length of the output surface fiber optic transducer cross section, color separation filters are located directly in front of a row of photodiodes an electronic converter and combined with them, and the color separation filters are spectrally matched with photodiodes with white and transparent originals.
    [3]
    3. Reader according to paragraphs. 1 and 2, characterized in that the light source is in the form of a white point source of a halogen or xenon lamp.
    [4]
    4. Device on PP. 1 and 2, characterized in that for a black-and-white reproduction of a color original, a filter with a characteristic v (A) is introduced, where A is the wavelength of transmitted light.
    [5]
    5. Device on PP. 1 and 2, characterized by that, in order to read opaque color originals, two lighting devices were introduced, the optical axes of which are oriented at an angle of 45 ° to the reading line.
    [6]
    6. A device according to claim 1, characterized in that the color separation filters of the rotating wheels with filters consist each of one dichroic filter, one or several colored glass plates and one neutral filter.
    [7]
    7. The device according to paragraphs. 1 and 2, characterized in that the photodiode series of the optoelectric converter has a read line length.
    [8]
    8. Device on PP. 1 and 2, characterized in that a strip-shaped diffusion plate and the next cylindrical lens are arranged between the cylindrical lens and the color original for reading transparent color originals.
    [9]
    9. The device according to paragraphs. 1 and 2, characterized in that a Fresnel lens is located between the scattering plate and the second cylindrical lens.
    FIG. 2
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    Ј Matt
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    FIG. b
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    Fig.i
    Phie. 7
    YU
    FIG. 9
    at
    Fig.12
    300
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    FIG. M
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19863614888|DE3614888A1|1986-05-02|1986-05-02|OPTICAL ARRANGEMENT FOR LINEAR LIGHTING OF SCAN TEMPLATES|
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