JPS59154675A - Optical reproducing device - Google Patents

Abstract

PURPOSE:To reduce a retrieval time of a desired track by performing coarse retrieval with an absolute position of an objective address being addition of a position data of difference between an read address and an objective address to the absolute position of an objective address when the difference between the address read after coarse retrieval and the objective address is a prescribed number of lines or over. CONSTITUTION:A microcomputer 18 calcultes the difference between a present address and an objective address, and when the result is a prescribed number of lines (e.g., + or -50 lines) or over and the retrieval is the 2nd times or over, the absolute position data of the objective address is added with a moving amount data + or -d of a linear motor 21 corresponding to the result of subtraction by the microcomputer 18, the result is taken as a data S+ or -d of the objective address, an optical carrying stand 23 is moved to the objective position, the present address is read, and when the number of lines is 50 lines or below, a command is given from the microcomputer 18 to a jumping drive circuit 25 for attaining jumping and the desired objective address is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to optical information processing and relates to a two-dimensional optical reproducing device.

Conventional configurations and their problems In recent years, optical recording and reproducing equipment has been used as a large-capacity storage medium.
Attention has been paid. A conventional optical reproducing device will be explained below. A large number of video signals or digitized codes are recorded by listening to an address signal on a disc-shaped optical recording medium (hereinafter referred to as a disc), and the Iro code at a specific address is searched from this disc and recorded. One reproducing device has been proposed. This type of means involves converging the light beams generated from a light source onto a disk and recording them concentrically or spirally on the disk.
Control the optical heather so that it is located in the rack 1-7
A photodetector detects the reflected light of the light beam from the disk or the transmitted light that passes through the disk, and reads the address signal of the track to which the light beam is currently directed from the detection output. On the other hand, a light source and an optical device for reading the connected signals are installed in the moving part of the transportation body, such as a linear motor, so that it can move in a direction almost perpendicular to the track, and any track can be searched. It becomes possible. At this time, an external school such as a differential transformer type position comb sensor is used to measure the absolute position of the conveying body. , which detects the position of the transporting body corresponding to the disk 10-2, and detects that the transporting body has moved close to the desired track position by the output of the external steel; Stop the transfer 1- (- Finish the rough search. Then, apply tracking, read the current address, and jump the light beam towards the specified address (hereinafter referred to as light beam 1), jump from one track to another. However, in the above configuration, the address information is added to the track and recorded/from among this large amount of signal information. When searching for information in a specific area, the address position of the disk and the linear motor are determined depending on the disc core runout, the temperature expansion of the disc, the accuracy of the linear ball's stop, the accuracy of the detection of 1 row, 10, 10, etc. As the absolute position changes due to movement, the difference between the current address and the imaginary specified address may become large after reading the current address after a coarse search that has been moved to the vicinity of the specified location, and the number of jumps for a fine search may become large. This has the disadvantage that more stable jumping is required due to the followability of the linear Chi-Yu, and a long time is required for the search, making it a permanent feature of high-speed searches.

Purpose of the Invention The present invention solves the above-mentioned drawbacks of the conventional example, and the difference between the read address and the target address after a rough search to move close to the desired location is determined by IJ = resolution of absolute positioning of the motor. If the number exceeds a certain level due to the speed of fine search by jumping, etc., use the position data of the address difference as the absolute position of the destination address. Therefore, one objective is to provide an optical playback device that shortens the search time for a desired track.

Structure of the Invention The present invention provides a linear motor for moving a column steel position sensor corresponding to an information track and an optical head close to the information track, a circuit for detecting the address signal 3 of the information track, and a track from the other track. Optical type equipped with a circuit for jumping to main device - yes, position sensor
By detecting the absolute position of the track and the address information position on the track, and changing the destination position 16 based on the address information on the track, the desired track can be searched at high speed. be. .

DESCRIPTION OF THE EMBODIMENTS FIG. 1 is a block diagram of an optical reproducing apparatus according to an embodiment of the present invention. In FIG. 1, a light beam 2 generated from a semiconductor laser 1 is transmitted through an intermediate lens 3. It passes through the bino splitter 4, changes its direction by the laser beam/cum mirror, and is converged by the converging lens 6 onto the beam 70. The reflected light 9 is reflected from the disk 7, which is placed on the disk rotation motor 80, and then passes through the converging lens 6 and is reflected by the mirror.
5, the direction is changed by the beam splitter 4, and the output port of the 2-split photodetector 10 is changed by the beam splitter 4, and the output port of the 2-split photodetector 10; 11b, and their respective outputs are applied to the differential amplifier 12 to obtain and amplify the difference Cj. The difference signal obtained by the differential amplifier 12 is sent to the tracking element and the drive circuit 1 via the king control circuit 13, which includes a lead/lag compensation circuit for compensating the phase of the servo system.
4 will be done manually. The dragging element 16 is driven by the output of the drive circuit 14, and the angle of the tracking mirror 6 attached to the tracking element 15 is changed so that the spot focused on the disk 7 scans the track. Tou noking is performed.

- On the other hand, the output of the 2-split photodetector 1Q is L at the regeneration circuit 16.
I', added to tl, video-(bow, digital playback signal is obtained. Upon completion, the address number of the truck is read out and inputted to the microcomputer 18 (hereinafter referred to as microcomputer).

When the address of the desired track is specified in the operation unit 19 and a search command is issued, - the microcomputer 18! 11. The difference between the current address and the specified address is 41n, and if the result is 11 or more than a certain number (for example, 6Q), the microcomputer 18 selects the booter or linear driver corresponding to the specified address. is output to. Linear motor split surface j circuit 2o
Then, the specified address data is converted to analog IT pressure by the digital-to-analog converter 1, and then the linear motor 2
to drive. Linear motor 21 (1)'ii) Moving part 22
The semiconductor laser 1. Intermediate L/ns 3. Hino, Sujiritta 4. Tracking element 15. If the converging lens 6 and the photodetector 10 are arranged on the same substrate as the optical transfer stage 23, then it is possible to use Qy h"i'. Therefore, IJ = a motor 2 tons) When Mil moves backward) 'f'-school transfer t-ton 23 is also 111
■ Rear 1-1 (b 1.-1 The optical beam 2 moves in the direction of Ij, which is almost perpendicular to the top and bottom directions of the disk 7. Also, a differential transformer type position sensor 24 Optical (multi-feed table 23
Detect the position of ``Iijiii! corresponding to the address 1!
The entire movable part 22 of the linear motor is controlled by the linear motor control circuit 20, and the e-movement is carried out to perform a rough search.

After the rough search, the address after the move is read out, and the difference from the specified address is sent to the microcomputer 18 and it is read again.If the difference is within a certain number of bells, the microcomputer 18 reads the number of bells as the result. The jumping finger A) is the jumping 1 drive circuit 25.
The output corresponding to the number of jumps from the jumping 1 drive circuit 25 is superimposed with the output of the trigger control circuit 13 in the driver circuit 14, and the output from the jumper 1 drive circuit 25 is superimposed with the output of the trigger control circuit 13. By changing the angle of 1-1, a dense search is performed to detect the target address.
(As for F41-device, its operation will be explained below.

Figure 2 shows the search flow of the present invention, with one operation console, L
■When target address N1 is input and a search command is issued,
No. tJ2 The current track number of the disk γ detected by the R separate circuit 17 (read the current address N2 by the microcomputer 18-C, and use the microcomputer 18 to subtract the target address N1 and the current address N2)/this result If N3 is zero, it is the target address and the search ends. If the decrease result is N3 or not zero, but there is a certain number of lines (for example, ±6Q lines) or more, and it is the first search, data S at the absolute position of the destination address N1 is sent to Miko/2.
Calculated with 0, the data S is sent to the near motor control circuit 20, and the light spot is scanned at the end of the scan.
The drive unit 22 moves the optical transfer table 23, and moves the optical transfer table 230 to the position where the output of the position sensor 24 which detects position 1β corresponds to the destination address N1. After moving, turn on tracking, read the current address N2 again, and select the destination address N.
The subtraction result N3 with 1 is not zero but more than ±50 lines, and 2
In the case of the search more than the first time, the linear motor 21 corresponding to the subtraction result N3 is added to the absolute position data S of the destination address N1.
The movement amount data NI Ld is applied by the microcomputer 18 to 1-7, the result is sent to the linear motor control circuit 2Q as the data S+cl of the destination address N1, tracking is turned off, and the optical transfer table 23 is moved at the destination position 1. Turn off tracking [- Read the current address If N3 is not zero and the number is 50 or more, the microcomputer 1st will send the jumping drive circuit 26 a command of N3 to start jumping <-j Obtain the desired [ ] address that is not available.

As described above, in this embodiment, by sending absolute position data according to the amount of error of the destination address to the linear motor control circuit, it is possible to prevent disc core runout, disc temperature expansion, linear motor control circuit, etc. Stopping accuracy □Depending on the detection accuracy of the position sensor, the disc
Even if the address position of 1 changes 1-, it is possible to search for the desired toe at high speed without adjusting the control circuit of the linear motor. The optical reproducing device of the present invention is arranged horizontally on an external scale detecting means corresponding to an information track.
′ change (1sa-m″1′戊 is “9(, f ′″0～0～
Pashima: It is possible to quickly search for a track on a desired disc: □, and its value in the IIZ industry is great.
1□

[Brief explanation of drawings]

Fig. 1 is a block diagram of an optical reproducing device according to an embodiment of the present invention, and Fig. 2 is a block diagram of an optical reproducing device according to an embodiment of the present invention.
7...Address identification circuit, 18...Microcontroller: His-p-, 20...Lini: Amotor space control 1il path, 21-...Linear 1-
24...Position sensor, 25...Jumping drive circuit. Name of agent: Patent attorney Toshio Nakao fl-/J.
1st leg Figure 4. Figure 2

Claims (2)

[Claims] (1) The information recorded on the disc recording unit 10 corresponds to the rack/external scale means, and the position corresponding to the output of this external scale means is set to a target value of 1 to 1. A first moving means that does not move near the information truck, and a second moving means that jumps the optical beam to another track [-1 After operating the first moving means, the
[7] An optical reproducing device 6', characterized in that the first movement 'fX and stage are operated again using a value that takes into account the difference between the signal track and the desired track as a target value. (2) The l-rack difference is set within a range that is faster than the difference between the information track and the desired track or the moving time of the second moving means. optical birth device.