JPS60239981A - Optical disc reproducing device - Google Patents

Abstract

PURPOSE:To make the position control possible without high-precision mechanical position detection by performing the track jump control of a pickup device until an index signal or the like recorded in an inside peripheral position of an optical disc is detected. CONSTITUTION:When an optical disc 1 is set and an operation switch is operated, an optical pickup device 15 is moved to the innermost side of the disc 1 and is detected by a detecting switch 16. Then, the device 15 is returned to the outside peripheral side of the disc 1 by a prescribed length. If an object lens 13 of the optical pickup device 15 is within a music signal recording area, the device 15 is moved to the inside peripheral side of the disc, namely, the second information signal area where the index signal or the like is recorded. Thus, the device 15 is moved to a correct position, and the operation mode of the device 15 is switched when the first music number data, the last music number data, and required time data are stored in a memory, and music signals are reproduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention reads and reproduces music signals and video signals recorded on an optical disc by irradiating the optical disc with a laser beam, and adjusts the diameter of the optical disc. The present invention relates to an optical disc playback device equipped with an optical pink amplifier device that can be moved in a direction.

[Background technology and its problems]

Conventionally, an optical disc playback device has a disc table that is rotationally driven by a spindle motor, and an optical disc is mounted on this disc table and rotated, and an optical system including a laser light source such as a semiconductor laser, various photodetectors, etc. The optical pink amplifier device is configured to run in the normal direction of the recording trunk formed on the optical disk from the inner circumferential side to the outer circumferential side of the optical disk, and emit light from the semiconductor laser, etc. There has been provided an optical disk in which a laser beam is irradiated vertically from the bottom side of the optical disk to traverse the recording trunk, and a predetermined information signal recorded on the recording trunk is reproduced in its entirety.

By the way, as shown in FIG. 1, the optical disc 1 used in the disc playback device configured as described above is provided with a mounting part 3 having a fitting hole 2 in the center for mounting on the disc table. The information signal is pulse-coded as a focus train between an inner lead part 4 formed at the outer circumference of the mounting part 3 and an outer lead part 5 formed at the outermost part of the optical disc. A signal recording section 6 in which signals are recorded at high density is formed. In this signal recording section 6, a first information signal consisting of a music signal for each song and a control signal indicating the song number data, elapsed time data, etc. of this song is recorded sequentially from the inner circumference '&1Jvh to the outer circumference. At the same time, a so-called T OC (t
A recording area called an available of content area is provided.

In the optical disc playback device as described above, when playing back the optical disc, first the TO
After reading at least the data necessary for the playback operation of this optical disc from the second information signal recorded in the C area and storing it in the memory provided in this optical disc playback device, the above first information signal is read. The entire reproduction operation of the information signal is started.

However, the information signals on the optical disc are recorded with high density, and the TOC area is formed over several hundred trunks within an extremely narrow range of, for example, 1 to 2 Mn in the radial direction of the optical disc. be. Therefore,
In order to read the second information signal in the TOC area, it is necessary to control the movement of the optical pink amplifier device with high precision so that its objective lens faces the TOC area,
The detection switch for detecting all the moving positions of this optical pink amplifier device also needs to be equipped with a high-precision, large-sized device such as a microswitch, which requires high cost and requires a large installation space. Furthermore, it is necessary to take measures to position and mount the detection switch with high precision, which causes difficulties.

[Purpose of the invention]

Therefore, in view of the above-mentioned circumstances, the present invention has been devised to accurately control the movement of the optical pink amplifier device to a position where the second information signal can be read, without performing highly accurate mechanical position detection using a detection switch. The purpose of the present invention is to provide an optical disc playback device.

[Summary of the invention]

That is, in order to achieve the above-mentioned object, the present invention has a detection switch for detecting an optical pink amplifier device provided at a position corresponding to the inner circumferential position of the optical disc, and when this detection switch is operated, this detection switch is provided. The output of the detection switch drives the optical pink amplifier device by a preset distance toward the outer periphery, and the optical pink amplifier device is driven to the inner periphery position of the optical disc related to a first information signal such as a music signal recorded on the optical disc. After the recorded second information signal is detected and stored in the memory, the next operating mode is entered.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described in detail according to the drawings.

As shown in FIG. 2a, the signal recording section of the optical disc 1 used in the optical disc reproducing apparatus according to the present invention is provided with a TOC area 7 in which a second information signal is recorded at the innermost circumference. A music signal recording area 8 in which a first information signal is recorded is provided on the outer peripheral side of the TOC area 7. That is, in the music signal recording area 8, music signals from 71 to 10n and control signals indicating the song number data, elapsed time data, etc. are multiplexed and recorded as the first information signal. has been done. The TOC area 7 also contains, for example, the first track number data, the last track number data, and all of the above-mentioned tracks recorded on the optical disc 1, which are necessary for the playback operation of the optical disc playback device. A control signal indicating the required time data of the recorded music, etc. is recorded as the second information signal over, for example, several hundred ranks.

Further, as shown in FIG. 3, the optical disc reproducing apparatus according to the present invention includes a disc table 9 on which the optical disc 1 is mounted, and a spindle motor 11 that is rotatably driven via 10 spindle shafts on the disc table 9r. a pink amplifier main body 12 which is moved in the radial direction of the optical disc 1 by a pink amplifier drive motor, and an objective lens 13 held by the pink amplifier main body 12 and attached to the optical disc 1. On the other hand, it is equipped with an optical pink amplifier device 15 having a two-axis single drive device 14 that is electromagnetically driven in the focusing direction and the tracking direction.

one! Additionally, this optical disc reproducing apparatus is provided with a detection switch 16 at the inner peripheral position of the optical disc 1 mounted on the disc table 9 for detecting the optical pink-up loading position. This detection switch 16 is activated when the optical pink amplifier device 15 moves from the outer circumferential side of the optical disc 1 to the inner circumferential side, and for example, when the objective lens 13 passes through the TOC area 7, the pink amplifier body 12 to detect the moving position of the optical pink amplifier device 15. The detection switch 16 is a so-called leaf switch, which has a pair of reed pieces, which are compressed by the object to be detected and come into contact with each other, and has a simple structure, is small, and is inexpensive. It will be done. The optical pink amplifier device 15 detected by the detection switch 16 having such a configuration is moved a predetermined distance in the outer circumferential direction of the optical disc 1 from its detection position by the pink amplifier drive motor. There is. This moving distance is such that the objective lens 13 of the optical pink amplifier device 15 is reliably set to the optical pink amplifier device 15 regardless of the detection position error due to the detection error of the detection switch 16 or the drive error of the pink amplifier drive motor. The value is set so that it is returned to the area of the signal recording section of the disc 1.

Furthermore, in such an optical disk reproducing apparatus, the optical pink amplifier device 15 is moved to a position where its objective lens 13 faces the TOC area 7 of the optical disk 1, and the data recorded there are For example, a control circuit as shown in FIG. 4 is provided for reading the second information signal. This control circuit includes a control signal extraction circuit 18 that extracts only the control signal from the valley information signal reproduced by the reproduction circuit 17 and converted into a digital signal, and a determination circuit 20 that determines whether the indicated song number data and the address data indicated in the TOC area 7 are the same or not, and supplies a pink amplifier drive signal to one input terminal of the OR circuit 19 when they are not the same; A memory 21 extracts and stores three data of the first track number data, last track number data, and required time data of the second information signal from the control signal, and the memory 21 stores the three data. 71), and a confirmation circuit 22 which confirms whether the data has been stored (71) or not, and supplies a pink amplifier drive signal to the other input terminal of the OR circuit 19 if the data has not been stored yet.

And the driving device 23 of the optical pink amplifier device 5
When the pink amplifier drive signal is supplied to any input terminal of the OR circuit 19, the two-axis drive device 14 is driven based on the output of the OR circuit 19, and the objective lens 13 is driven. The trunk jump control operates to move the optical disc 1 to the inner circumferential side by, for example, 100 recording trunks.

In the optical disc playback device configured as described above, when the optical disc 1 is loaded and the play operation switch is operated, the optical pink amplifier device 15 activates the inner part of the optical disc 1 as shown in FIG. It is moved toward the circumferential side and is detected by the detection switch 16 as shown in FIG. 2C. Then, as described above, the optical pink amplifier device 15 is returned to the outer circumferential side of the optical disc 1 by a predetermined distance as shown in FIG. 2d. In this state, the optical jump device 15 has its objective lens 13 attached to the optical disk 1.
A sword will be placed in a position facing the signal recording section of
Two-axis drive device 1 of this optical pink amplifier device 15
4, a semiconductor laser, a photodetector, etc. are set to a driving state. Therefore, a reproduction operation by this optical pink amplifier device 15 is performed. When the position of the objective lens 13 of the optical pink amplifier device 5 is within the music signal recording area 8, the determination circuit 20 outputs the pink amplifier drive signal, and the optical pink amplifier device 15 outputs the pink amplifier drive signal. is moved to the inner circumferential side of the optical disc 1, that is, to the TOC area 7 side, by trunk jump control. Further, the objective lens 13 is
Even if the data is within the OC area 7, if the three data to be stored in the memory 21 are not stored, trunk jump control is performed based on the pink amplifier drive circuit of the confirmation circuit 22, and the optical pink amplifier device 1
5 is moved to the inner circumferential side of the optical disc 1. In this way, the optical pink amplifier device 15 shown in FIG.
The trunk jump control is repeated until the trunk jump control is moved to an appropriate position facing the TOC area 7 as shown in FIG. When the optical pink amplifier device 15 is moved to the appropriate position and the three data are reliably read, the operation mode of the optical pink amplifier device 15 is switched, and the music signal is reproduced.

It should be noted that the present invention is not limited to the above-described embodiments; for example, the control circuit may be entirely configured within a microcomputer.

〔Effect of the invention〕

As is clear from the above-described embodiment 1, according to the present invention, in order to accurately move the optical pink amplifier device to a position corresponding to the recording area of the second information signal, the optical pink amplifier device There is no need to perform highly accurate mechanical position detection. Therefore, instead of a complex, large, and expensive detection switch, a simple, small, and inexpensive detection switch can be used.In addition, the detection switch can be positioned and installed with high precision. This also eliminates the need for adjustment screws and the like, thereby reducing the number of parts and simplifying the adjustment and assembly of the detection switch.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an optical disc, FIG. 2 is a schematic diagram illustrating the operation of an optical pink amplifier device for the signal recording section of the optical disc, and FIG. 3 is a structure of an optical disc playback device. FIG. 4 is a schematic diagram showing a partially cutaway side view of the optical disc reproducing apparatus, and FIG. 1... Optical disc 600 signal recording section 7 -TOC area 15... Optical pink amplifier device 16... Detection switch 18... Control signal extraction circuit 20... e judgment circuit 21... Memory 22... ...Confirmation circuit 23...Pink amplifier drive circuit patent applicant Sony Corporation representative Patent attorney Mimi Koike 1) Sakae Mura −

Claims (1)

[Claims] A detection switch i for detecting the optical pink amplifier device is provided at a position corresponding to the inner circumferential position of the optical disc, and when this detection switch is operated, the optical big amplifier device is preset by the output of this detection switch. the second information signal recorded on the inner circumferential position of the optical disc, which is related to the first information signal such as a music signal recorded on the optical disc, and stores it in a memory. After that, the optical disc playback device enters the following operating mode.