JPS6240621A - Optical reproducing device - Google Patents

Abstract

PURPOSE:To execute the optical reproduction of an excellent random property and a short access time by executing independently an access to plural optical pickups to which a projecting member is guided by a spiral groove so that it can be led in, and reproducing the information recorded in an optical disk. CONSTITUTION:A projecting member 22 or 23 which is provided on an optical pickup 2 is projected from the pickup 2, and the projecting member is inserted into a spiral groove 130 provided on a disk 13. In this case, since the disk 13 is rotating in parallel to an optical disk 1, the pickup 2 executes an access operation is the radial direction of the optical disk 1as the member 22 or 23 is guided by the groove and led. Said member 22 or 23 is inserted into a right or left hand wind spiral groove, respectively, by projecting from the pickup 2. Also, by selecting one projecting member, the pickup 2 is moved by selecting the outside or inside peripheral direction of the disk 1, and the access of an object optical pickup is realized.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is directed to an optical information recording medium (hereinafter referred to as an optical disk) on which information data, images, or sounds (hereinafter referred to as information) are recorded with a light beam. The present invention relates to an optical playback device that plays back recorded information by irradiating the light.

[Prior Art] Recently, optical disk devices, CD (compact disk) devices, laser video disk devices, and the like that reproduce information from optical disks at high speed and with high quality have been put into practical use.

These conventional optical playback devices generally include one optical pickup, move a light beam in the radial direction of the optical disc, and further control the tracking of the light beam to perform concentric or circular pickup on the rotating optical disc. A light beam is traced along a spiral track, and as the optical disc rotates, information recorded on the track is sequentially detected.
It reproduces the desired information.

[Question to be Solved by the Invention] According to conventional optical playback devices such as L distribution, information recorded on a rotating optical disk is transmitted by an optical pickup to a rotating optical disk. irradiates the optical disc, serially detects recorded information as the optical disc rotates, and obtains reproduced information (so-called serial readout).
For this reason, random accessability is lacking, and access waiting time is required until the desired reproduction information is obtained. That is, for example, by the time the viewer obtains the desired information, he/she will obtain information other than the desired information. In order to solve this problem and obtain random access and high-speed access, it is of course possible to operate several optical playback devices in parallel at the same time, but this requires the installation of a large number of expensive playback devices. Furthermore, a control device is required to control each reproduction device as desired, which causes problems such as the overall size and complexity of the device.

[Means and effects for solving the problems 1] In view of the above-mentioned problems, the present invention rotates a disk having spiral grooves in opposite winding directions in seven rows with an optical disk in an optical playback device, and By arranging two or more optical pickups each having a retractable guided projection member, each optical pickup can access the optical disk independently, improving random access for information reproduction and realizing high-speed access. It is something.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings. In addition,
In the following description of the drawings, the same reference numerals are given to the same members having the same function to avoid duplication of the description.

FIG. 1 is a diagram illustrating a first embodiment of an optical reproducing apparatus according to the present invention. 1 is an optical disk, which is attached to a rotating shaft 12 rotated by a spindle motor 11 and rotated. 2 is an optical pickup; only one of the plurality of pickups is shown in the figure, and the others are omitted. 21 is an objective lens. Projecting members 22 and 23 are retractably installed on the optical pickup 2. 13 is a disc and is an optical disc■
The spiral groove 1 rotates in the opposite direction and winds in opposite directions.
It has 30.

According to this embodiment, when accessing the optical pickup 2, the protrusion member 22 or 23 provided in the optical pickup 2 is made to protrude from the optical pickup 2, and the protrusion member is inserted into the spiral groove provided in the disc 13. be done. At this time, since the circle fi 13 is rotating in 7 rows with the optical disc l, the optical pickup 2 accesses the optical disc l in the radial direction as the projection member 22 or 23 is guided by the spiral groove 130. . The protruding members 22 and 23 are inserted into the Ishinomaki spiral groove or the left-handed spiral groove, respectively, by protruding from the optical pickup 2, and by selecting either one of the protruding members, the optical pickup 2 is inserted into the optical disk l. The optical pickup can be selectively moved in either the outer circumferential direction or the inner circumferential direction to achieve the desired access to the optical pickup.

In addition, 1 includes other optical pickups not shown.

The plurality of optical pickups perform the above access operations independently of each other.

FIG. 2 shows a top view of an embodiment of the disk 13 having a spiral groove. 113 has a right-handed spiral groove 131a from the inner circumference to the outer circumference, a left-handed spiral groove 131b from the inner circumference to the outer circumference, and the outermost part of the Ishinomaki spiral and the innermost part of the left-handed spiral. They are provided so as to be adjacent to each other at a position corresponding to a concave portion approximately in the middle of the radius of the optical disk l.

Projecting member 22 or 23 of the optical pickup 2 indicated by a broken line
protrudes from the optical pickup 2, is inserted into the spiral groove 131a or 131b of the circle 513, and is guided by the spiral groove according to the rotation of the disk (arrow A in the figure), and the optical pickup 2 is inserted into the optical disc (not shown). ) in the radial direction (arrow direction B in the figure) to access it. In the figure, only two of the plurality of optical pickups are shown, and the others are omitted.

FIGS. 3A to 3E are explanatory diagrams illustrating the operation of the above embodiment in more detail. 3rd (A) is a sectional view of a main part of the optical pickup 2 viewed from the rotation direction of the optical disk.

The optical pickup 2 is moved up and down by solenoids 221 and 231, and has a protruding member (pin) 22 which also serves as the axis of the solenoid.
23. 24, (25) is a shaft which will be explained later, 26 is a plate that connects the pins 22 and 23 and is tilted, 27.
(28) is a brake piece which will be explained later. Pin 22.
23 is normally pulled toward the optical pickup 2 by a spring provided between the solenoid and the plate 26 (when the solenoid is not energized), and when the solenoid is energized, it protrudes and inserts its tip into the groove 130 of the disk 13. .

Solenoid 2 when accessing optical pickup 2
21 or 231, the pins 22 and 23 resist the spring.
one of them is made to protrude from the optical pickup 2. The protruding tip of the pin is inserted into the spiral groove 130 of the circle fi13, and the circle i! In Fig. 0, the optical pickup 2 is moved in the radial direction of the optical disc l (6 left and right in the figure) according to the winding direction of the spiral groove by the rotation of the disc 1.
3 rotates in the direction of arrow A in FIG. 2, the pin 23 is guided by the left-handed spiral groove 131b and moves the optical pickup 2 toward the inner circumference of the optical disc.

FIG. 3(B) is a cross-sectional view of the main part of the optical pickup 2 seen from the access direction.

The optical pickup 2 is arranged parallel to the access direction.
The protrusion member, solenoid, etc. are omitted in Figure 0, which is pivotally supported by book shafts 24 and 25, moves in the front and back directions of the figure, and accesses the optical disk (not shown) with a light beam.

FIG. 3(C) is a perspective view showing the relationship between the plate 26, the brake piece, and the shaft. The plate has a cross shape as shown in the figure, and brake pieces 27 (brake pieces 28 on the opposite side are omitted in the figure) made of rubber or plastic are attached to both ends of the arms that protrude to the left and right in the center. be. When either the pin 22 or 23 is driven by a solenoid and protrudes from the optical pickup 2, the plate 26 is tilted and the brake piece 27 (and 28) is connected to the shaft 24 (the opposite shaft 2 in the figure).
5 is omitted), and the brake is released. Therefore, as described above, the pin of the optical pickup amplifier 2 is guided by the circle 113 (not shown) to access the optical beam. When the optical pickup 2 reaches a predetermined position, the energization of the solenoids 221, 231 is stopped, and the pins 22, 23 are separated from the circle fi 13 by the force of the spring, and the plate 26 is held parallel. As a result, the brake pieces 27, 28 are brought into pressure contact with the shaft 24, 25, the brake action is activated, and the optical pickup 2 is fixed at that position. Thus, the light beam tracks a predetermined track under tracking control to reproduce information recorded on the optical disc.

In FIG. 3(D), contrary to the case of FIG. 3(A), the pin 22 is protruded from the optical pickup 2, and the right-handed groove 1 of the circle i13 is
31a to move the optical pickup 2 toward the outer circumference of the optical disc.

FIG. 3(E) shows the braking operation of the optical pickup by the brake pieces 27 and 28, in which the pins 22 and 23 are pulled into the optical pickup 2 by the springs, and the plate 2
6 is parallel, brake piece, 27 (2B) is shaft 24
(25) shows the brake state in which it is pressed.

FIG. 4 is a top view showing another embodiment of the disk 13 having spiral grooves. The disk 13 has spiral grooves in which the winding direction is reversed from the inner periphery to the outer periphery. 132a and 132b are provided concentrically overlapping each other.

Figures 5 (A) and (B) are when the disk shown in Figure 4 is used.
.

The optical pickup 2 and the grooves 132a and 132 in the embodiment of
FIG. 3 is a top view illustrating the operational relationship between

200 is a guide plate which will be explained later, and 201 is a solenoid which rotates an arm-shaped plate 202 which is pivotally supported.

(A) shows the case where when the disk 13 rotates in the direction of the arrow in the figure, the guide plate 200 guides the optical pickup 2 to the left-handed spiral groove (actual kQ) 132a to access the inner circumferential direction. Each figure shows a case in which when the access disk 13 rotates in the direction of the arrow in the figure, the guide plate 200 guides the optical pickup 2 to the right-handed spiral groove (actual 1) 132b to access the outer circumferential direction.

FIG. 6(A) is a sectional view of a main part of another embodiment of the optical pickup 2 in which the disk shown in FIG. 4 is used, viewed from the rotational direction of the optical disk. In the optical pickup 2, solenoids 201 and 203 pivotally support an arm-shaped plate 202 via a shaft 204, and move to LF. The arm plate 202 is rotated by the solenoid 201. A guide plate 200 is provided at the f section of the shaft 204. 27 (2B) is an arm-shaped plate 202
This is a brake piece attached to the. Note that a stopper is provided to restrict the amount of rotation of the arm plate 202 integrated with the shaft 204 by the solenoid 201, but it is not shown.

Solenoid 20 when accessing optical pickup 2
1, the arm-shaped plate 202 is attracted by the solenoid 201 and is supported by the shaft 204 to rotate the guide plate 200. When the solenoid 201 is de-energized, the arm plate 202 is pushed by the spring between the solenoid 201 and the arm plate 202, and the guide plate 200 rotates in the opposite direction. Furthermore, when the solenoid 203 is energized, the shaft 204 moves downward, causing the guide plate 200 to protrude from the optical pickup 2. When the solenoid 203 is de-energized, the shaft 204 is pulled upward by the spring, and the brake pieces 27 and 28 are pulled upward from the shaft 204.
．． According to the above embodiment, the structure between which is pressed against the optical pickup 25 and performs a braking action is shown in a perspective view in FIG. 6(B).
The guide plate 200 is rotated by controlling the arm plate 202 using a spring, and the solenoid 203 is rotated.
is controlled to ON10 F F to protrude the guide plate 200 to form the groove 132a of the circle 9i13 having the fourth spiral groove.
Alternatively, by moving the optical pickup 2 along the optical disc 132b, the optical pickup 2 can be guided and moved as desired in the radial direction of the optical disc, and the optical beam can access the disc.

FIG. 7 is a block diagram showing an embodiment of the optical reproducing apparatus of the present invention. 1 is an optical disk, and there are four optical pickups 2a that can be accessed independently.

2b, 2c, and 2d are arranged radially with respect to the optical disc l. Optical pickups 2a, 2b.

Detection signals 3a, 3b, 3 detecting the return light of the light beams 2c and 2d irradiated onto the optical disk l at the same rate, respectively.
c and 3d are demodulation circuits 4a, 4b, 4c and 4d signal processing circuits 5a, respectively.

0 selection circuit 6 multiplexer 61. which inputs to the selection circuit 6 via 5b, 5c, 5d. D/A converter 62. The filter circuit 63 and the multiplexer 64 are configured as a common block, and the output signal is sent to the sample and hold circuit 7a.

7b, 7c, 7d and amplifiers 8a, 8b, 8c.

The signal is supplied to speakers 9a, 9b, 9c, and 9d via 8d.

According to this embodiment, four optical pickups 2a, 2b,
2c, 2d (7) detection signals 3a, 3b.

3c and 3d are demodulated by demodulation circuits 4a, 4b, 4c, and 4d, and then sent to signal processing circuits 5a, 5b, and 5c.

The 0 selection circuit 6 undergoes error correction and de-interleaving processing in 5d and is inputted to a common selection circuit 6. The 0 selection circuit 6 sequentially switches input signals by a multiplexer 61 and selectively inputs them, and the D/A converter 62 outputs an analog signal. After the signal is converted into , a filter circuit 63 filters out the harmonic part, and a demultiplexer 64 synchronized with the multiplexer 61 selects a circuit again and outputs the signal. Each optical pickup 22
Sample and hold circuits 7a, 7b, 7c, and 7d corresponding to a, 2b, 2c, and 2d hold the input signals until the next signal arrives, and supply sampling outputs to amplifiers 8a, 8b, 8c, and 8d. However, the TEFL voice signal is not reproduced by the speakers 9a, 9b, 9c, and 9d.

Note that when this embodiment is applied to an office ff (audio) playback device, the sampling frequency is set to 44. IN) lz, the number of optical pickups is 4, and the switching frequency of the multiplexer 61 is 178.4 KHz or more.

In addition, in the above description of the embodiment, it is shown that the disks having spiral grooves are mounted together with the rotational axis of the optical disk as a common axis, but the optical disk and the disk do not necessarily have to have the same rotation speed. For example, it is possible to make the disk rotate at twice the rotational speed that is synchronized with the rotation of the optical disk. Further, it goes without saying that the protruding member is driven not only by the lenoid but also by other driving means.

[Effects of the Invention] According to the present invention, a disk having spiral grooves in opposite winding directions is rotated in the same direction as the optical disk, and a projection member guided by the spiral grooves is retractably attached.
Since the above-mentioned optical pickups can be accessed independently to reproduce information recorded on an optical disc, it is possible to provide an optical reproducing device with excellent random access performance and short access time.

[Brief explanation of the drawing]

FIG. 1 is a main part configuration diagram showing the first embodiment of the present invention,
The figure is a top view showing an embodiment of a disk having spiral grooves, FIGS. 3A and 3B are explanatory diagrams for explaining the operation of the embodiment, and FIG. 4 is a top view of an embodiment of a disk having spiral grooves. 5(A) and (B) are a top view showing the embodiment of FIG.
Figure 11, Figures 6 (A) and (B) are sectional views of the concave portion showing other embodiments of the optical pickup when the disk shown in Figure 4 is used, and Figure 7 is a cross-sectional view of the recess of the optical reproducing device of the present invention. It is a block diagram showing an example. l... Optical disk 11... Spindle motor 12... Rotating shaft 13... Discs 2, 2a, 2b, 2c, 2d-... Optical pickup 2
1...Objective lens 22.23...Protrusion member 131...Spiral grooves 131a, 131b, 132a, 132b...Spiral grooves Fig. 1 Fig. 3 (A) F1 Fig. 3 (D ) F1 (E) Figure 6 (A) To 1 (B) 11

Claims (2)

[Claims] (1) A disc equipped with spiral grooves in opposite winding directions that rotates in a plane parallel to the optical disc, and two or more optical pickups that are retractably fitted with protruding members guided by the spiral grooves of the disc. An optical playback device characterized by: (2) The optical reproducing device according to claim 1, wherein the spiral groove is a groove in which the direction of spiral winding is reversed left and right at the central portion of the radius of the disk. 3. The optical reproducing device according to claim 1, wherein the spiral groove is a groove formed by concentrically overlapping spiral grooves in which the winding directions of the spirals are opposite to each other.