前苏联专利SU929021A3 Device for retrieving data recorded on disk

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优先权

专利摘要:
The invention concerns the reading by optical means of data recorded along a track on a disc; an address code, which increases one unit at each step, is recorded on the disc at the same time as the data. The optical reader contains a device for the fast movement of the reading head in a direction radial to the disc, a device for counting the number of track grooves thus crossed, a device for automatic access to some given data which contains a device for detecting addresses recorded and a programmed control circuit which triggers fast movement or a step by step movement of the reading head depending on whether the reading head is far from the track groove whose address has been recorded or is near to this track groove.
公开号:SU929021A3
申请号:SU772472886
申请日:1977-04-22
公开日:1982-05-15
发明作者:Ромеа Рене；Тома Мишель
申请人:Томсон-Бранд (Фирма)；
IPC主号:

专利说明:

NW) A DEVICE FOR SEARCHING INFORMATION RECORDED ON A DISC
one
The invention relates to automation and computer technology and can be used, for example, in creating optical memory systems of computers.
Devices are known for searching information recorded on a disk in the form of spiral tracks, the action of which is based on moving the photodetector head along the disk radius under the influence of control commands formed by the corresponding electronic units 1.
The closest in technical essence of a device for searching information recorded on a disk is a device comprising an optically coupled light source, a lens and a photoreceiver head optically coupled to a disc, consisting of an optically coupled read lens, a splitter, and a photodetector, a fast moving engine and a slow moving engine
displacements kinematically associated with a photodetector head, a coarse search unit and a precision search unit, the outputs of which are connected to the inputs of fast and slow motion engines, respectively, the control unit, the first and second groups of which are connected to the inputs of the exact search unit and the first group of inputs of the coarse search unit respectively, and associated with the sensor disk of the beginning of the search and the sensor of the end of the search, the outputs of which are connected to the first and second inputs of the control unit (respectively).
The main disadvantage of this device is its low speed. Thus, for example, if it is necessary to select the desired image from the volume of 40,000 images recorded on a disk, the search time can be as long as 16–18 s.
The purpose of the invention is to reduce the search time for information recorded on a disk.
The goal is achieved by the fact that a serially included demodulator, a detector address circuit and a memory block, a serially connected threshold circuit, a filter and a driver amplifier are added to a known device for searching information recorded on a disk, the demodulator input is connected to the output of the photodetector head, the output of the memory unit is connected to the first group of inputs of the control unit, the input of the threshold circuit is connected to the output of the photoreceiver head, the output of the amplifier of the imager is connected to About the input of the coarse search block, and a third group of outputs of the control block is connected to the corresponding inputs of the memory block.
The coarse search block contains a counter, a decoder, and two circuits 14, the counter outputs are connected to the decoder inputs, the decoder output is connected to the forward inputs of the first and second AND circuits, and the inverse inputs of the AND circuits and the counter inputs are block inputs.
The control unit comprises a subtracting unit, a program setting unit associated with the subtraction unit, a synchronizer unit associated with the subtraction unit, four address registers associated with the program setting unit and a subtraction unit, and an information register associated with the subtraction unit.
FIG. 1 is a block diagram of a device for searching information recorded on a disc; in fig. 2 is a block diagram of a coarse search block; FIG. 3 block diagram of the control unit
A device for searching information recorded on a disk contains a light source 1, a lens 2, a detector addressing circuit 3, a memory memory block 5, a control unit 5, a coarse search unit 6, an exact search unit 7, a fast displacement engine 8, a motor 9 slow moving, a photodetector head 10, consisting of a read lens 11, a beam splitter 12 and a photodetector 13 demodulator 1, a threshold circuit 15 a filter 16, an amplifier driver 17, a search start sensor 18 and a sensor 19
the end of the search (, figure 1). Position 20 H in figure 1 marked the disc with the recorded information on it.
BLOCK 6 rough search contains
the counter 21, the decoder 22, the first circuit And 23 and the second circuit And 2 (figure 2).
BLO.K 5 controls contains subtraction node 25, node 26. program instructions, synchronizer 27, four
address register 28-31 and information register 32.
The operation of the device to search for information on the disk is as follows.
The search for information specified by the search index, either stored in G block 4 or determined by block 5, is carried out in two phases. The first 0 phase of the coarse search, during which the photodetector head 10 of the engine 8 is rapidly moved by the number n of tracks recorded on the disk 20, predetermined by the difference between the original information index read by HEAD10 and the search index. The reading of information is carried out by a light spot formed in
the result of the interaction of the source ;; veta 1, the lens 2, the beam splitter 12 and the lens 11 of the head 10. During the second phase — the exact search phase — the head 10, under the influence of the engine 9, makes step jumps, the image index is read in both half-frames and compared with the search index. In working condition, the disk 20 rotates around its axis at a constant yi- speed. The read signals generated at the output of the photoreceiver 13 are demodulated by demodulator 1 and fed to the input of circuit 3. To count the tracks intersected during the fast movement of the head 10 along the radius of the disk 20, the signals taken from the output of the photoreceiver 13 are represented. sequence of high-frequency pulses. Each high-frequency pulse corresponds to the transition of the photodetector head 10 to the next recording track. High-frequency pulses are sequentially passed through circuit 15, the filter

权利要求:
Claims (3)
[1]
1b, the amplifier driver 17 and enter the block 6 at the input of the counter 21, which counts the tracks intersected by the head 10. When the read spot reaches the ends of the spiral recording track, the sensor 18 sends to the block 5 a signal corresponding to the beginning of the track, and the sensor 19 signal corresponding to the end of the track. The detector address circuit 3 transmits the address signals formed by a sequence of binary elements, and the clock signals in the rhythm of the arrival of the binary elements of the address signal to the block. The block transmits to block 5 either the address corresponding to the address signal or the previously announced address of the search image. Unit 5 receives signals from sensors 18 and 19 and generates control signals for fast and slow movement, fed to the inputs of blocks 6 and 7, respectively. In addition, block 5 performs the polling commands for block k. In this block 6 is transferred the number of n-, calculated and stored in the block k. The address of the image to be read is transferred from block k to block 5 where it is compared with the address read earlier. The head 10 is at this stop position in the image. If the value of n exceeds a given number, block 5 through block 6 moves the head 10 until the number of crossed tracks is equal to the difference between the number n and the specified number. Then there is a stop on the image and a determination of the new address corresponding to the new position of the head 10 If the difference between the address, respectively. the new position of the head 10 and the specified address does not exceed the specified number, the coarse search phase is stopped and further search is performed in the slow search mode. The image address is detected at each jtuare and compared with the specified address. The use of this device significantly reduces the search time for information recorded on the disk. Thus, for example, the device will select one image from the total number of images recorded on the disc, reaching “0000. for a time not exceeding a few seconds. Claims 1. Device for searching information
o | "raLJuji i.
1 g l p 1/3 -
OjannLJI. r-tr4) 16 an optically coupled light source, an objective lens and a photoreceiver head optically coupled to a disk, consisting of an optically coupled readout lens, a beam splitter and a photoreceiver, a fast displacement engine and a slow displacement engine, kinematically associated with a photoreceiver head , the coarse search unit and the exact search unit, the outputs of which are connected to the inputs of fast and slow moving motors, respectively, the control unit, the first and second groups of outputs of which are connected to the inputs of the exact block search and the first group of inputs of the coarse search block, respectively, and a disk start search sensor and a search end sensor, the outputs of which are connected to the first and second inputs of the control unit, respectively, characterized in that, in order to shorten the search time, entered in series are a demodulator, a detector address circuit and a memory block, a successively on threshold circuit, a filter and a driver amplifier, with the input of the demodulator connected to the output of the photoreceiver head, you od block memory connected to the first group of inputs of the control unit, the input of the threshold circuit is connected to the output of the photodetector head, the output of the amplifier shaper connected to the input coarse search block, and a third group control unit outputs connected to respective inputs of the memory unit,
[2]
2. The device according to claim 1, wherein the coarse search block contains a counter, a decoder and two AND circuits, the counter outputs are connected to the decoder inputs, the decoder output is connected to the first and second direct inputs, and the inverted inputs of the AND circuits and the inputs of the counter are the inputs of the block.
[3]
3. The device according to claim 1, characterized in that the control unit contains a subtraction node, a green program assignment associated with the evil subtraction, a synchronizer associated with the subtraction node, four registries of addresses associated with the node
792902 8
and the information register associated1-US Patent No. 3833769,
with a knot vuchita nor. G11 B 7 / QO, publ. 197 Sources of information, 2. For France N ° 22 18569,
taken into account during examination. G11 7/00, 1976 (prototype

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同族专利:

公开号 | 公开日

DE2718092A1|1977-11-10|

DE2718092C2|1985-02-21|

NL7704296A|1977-10-25|

JPS6114590B2|1986-04-19|

IT1086888B|1985-05-31|

CA1093691A|1981-01-13|

FR2349191B1|1982-03-19|

JPS52152704A|1977-12-19|

FR2349191A1|1977-11-18|

CS254952B2|1988-02-15|

PL115268B1|1981-03-31|

NL183909C|1989-02-16|

GB1573031A|1980-08-13|

US4106058A|1978-08-08|

CS262277A2|1987-07-16|

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法律状态:

优先权:

申请号 | 申请日 | 专利标题

FR7612067A|FR2349191B1|1976-04-23|1976-04-23|

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