JPS6352372A - Both sides reproducing disk player - Google Patents

Abstract

PURPOSE:To obtain a disk player superior in operability by constituting the disk player so that reproducing is started from a desired disk face without taking front and rear faces of the disk into consideration at the time of setting the disk. CONSTITUTION:If the lower face of a disk 2 is not the face which is designated by an A/B designating button 1a and should be reproduced, a feed motor 5 is so controlled that a mobile base 6 immediately reaches the innermost peripheral part on the upper face of the disk 2 after short-time reproducing operation, and a pickup 4 starts scanning. At this time, a spindle motor 25 is so controlled that it is rotated in the direction opposite to that for scanning of the disk lower face. The mobile base 6 reaches the innermost peripheral part of the lower face of the disk after completion of scanning, and the spindle motor 25 is reversed again in this position, and the pickup 4 scans the lower face of the disk. Consequently, the mobile base 6 is moved to A B A C A when the disk is set with a face A turned up and a face B turned down and the face A is designated by the button 1a or the disk is set with the face B turned down and the face A turned up and the face B is designated.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a disc player that reproduces information recorded on both sides of a disc.

(B) Conventional technology Conventionally, when playing a disc recorded on both sides with a pre-emptive video disc player, when the reproduction of the information on one side is completed, the disc is removed, and after being turned over, the other side is played. It was necessary to play that aspect. Therefore, even if the front or back side of a disc is inserted incorrectly, the disc must be ejected, turned over, and reinserted.

JP-A-57-169936 proposes a technique that enables continuous reproduction of both sides with a single pickup.

In the conventional technology, by connecting the pickup to a moving member via a crank rotation member so as to be rotatable by 180 degrees with respect to the disk surface, one pickup can continuously record or reproduce both sides of an optical disk. An optical disc device is disclosed.

(C) Problems to be Solved by the Invention The prior art described above can perform continuous playback of a disc without ejecting the disc and turning it over. No countermeasures have been taken against this problem, and the pickup cannot be automatically moved to the desired playback surface specified by the user, so it is necessary to flip the disc over as before.

2) Measures to solve the problem Detect the facing surface of the pickup when the disc is mounted, compare it with a desired playback surface specified in advance, and always move the pickup to the specified playback surface based on this comparison output. It is characterized by

Since the present invention is constructed as described above, playback is started from the desired disc surface regardless of the state in which the disc is loaded in the disc player.

(f) Example An embodiment of the present invention will be described below with reference to the drawings.

Figure 2 shows the appearance of an original format video disc player, with a front panel (1) and a disc (2) on the front.
Disc tray (disk loading section) (3) to set the
However, it is horizontally movable between two positions: a storage position and a drawer position. The disk (2) placed on the disk tray (3) is clamped to a turntable driven by a spindle motor (7). In addition, the disk (
Video signals are recorded on both sides of 2).

The operation section of the front panel (1) has various operation buttons such as PLA'l] and stop button, as well as an A button that specifies whether to start playback from side A or side B of the disc (2).
/B designation button (designation means) port") is provided.

FIG. 6 is a perspective view of the main parts of the pick amplifier feeding device, in which a big amplifier (4) and a feed motor (pickup moving means) (5) are fixed on a movable base (6).

A bracket (7) is glued to the right end of the movable base (6), and a gear (8) is fixed to the motor shaft through the bracket (7). Also, this bracket (7)
A pinion (pickup moving means) (9) that meshes with the gear (8) is supported by the shaft. On the left side of the movable base (6), there are two 0-ra (pickup moving means) CI
O+(11) is pivotally supported.

(It is a rack that meshes with the single-piece pinion (9), and has a lower linear portion (12) extending horizontally on the lower chassis, and an upper i portion extending parallel to the lower linear portion (12a) on the lower surface of the upper chassis. The linear portion (12c) and the U-shaped connecting portion (12b) that connects both linear portions are integrated into one body.The connecting portion (12
On the inner surface of b), a guide groove into which the pinion shaft (9a) can be loosely fitted extends in a U-shape.

The circle is a guide rail on which the roller shaft αD slides, and like the rack @, the lower linear part (14th) and the upper linear part (14th)
It consists of a connecting part (14b) that connects the four straight parts and both straight parts. The inner surface of the connecting part (14b) has a guide groove (15) into which a roller shaft (10) can be loosely fitted, similar to the rack hitter, and the sliding surface of the roller 0α (11) has a roller guide groove (15). ) is formed, and the cylindrical pole fixed to the upper and lower chassis groups CD1 is the idle pole, which is arranged parallel to the rack az and the linear part lζ of the guide rail circle. The ball (161 (1η) is screwed onto the chassis with screws 09 interposed between the cylindrical fixing member and the chassis as shown in FIG. 4.

A fitting hole for fitting the guide ball (IC) is formed on the lower surface of the movable base (6). It is notched.

Note that the disc (2) placed on the disc tray (3)
) C Upper and lower linear parts (12a) (14a) - (12C
X14C) is clamped by the turntable ■.

Next, we will explain the operation of the device of this embodiment. In the 5TOP mode, the standby position shown by A in FIGS. 5 and 6, that is, the lower linear portion (12a)
The movable base (6) is located immediately in front of 14b and 14l.

Side A or B is specified in A/B side designation J (1a), and either side A or B of the disc (2) is placed on the bottom side and the other side is placed on the disc tray (3). After installing it so that it is on the upper side, turn on the PLAY button to shift to PLAY mode, the feed motor (5) starts driving, and its driving force is transmitted to the pinion (9), which meshes with the rack a. The position indicated by B, that is, the lower straight part (12a
The movable base (6) moves to the tip position of X14.

At this position, the pickup (4) faces the innermost circumference of the bottom surface of the disk (2). After this, the spindle motor starts rotating, and the set meal of the disk (2) by the big 7 hoop (4) is extremely (This is done for only a short time. Due to this extremely short playback, the color video signal on the bottom side of the disk (2), the audio signal of 2 channels, and the video signal are reproduced within the predetermined horizontal scanning period of the vertical blanking period. The added digital code is extracted. After these various signals are demodulated, they are inserted between the digital code separation circuits as shown in FIG.
Only digital codes are extracted.

Further, the digital code is input to a disc side detection circuit (detection means) (41) to separate only the disc side data and identify the surface of the disc (2) facing the bit up (4) in the initial state, i.e. The disc side data forms a digital code together with frame number data, program time data, chapter number data, etc., and is used to identify whether it is side A or side B.

The disc side data thus obtained is input to the comparison circuit (comparison means) (port) together with the output of the A/B designation button (1a), and a match between the two is determined.

As a result of the comparison, the two match, that is, the lower surface of the disk (2), which is the surface facing the pickup, is the A/B designation button (1a).
), the feed motor control circuit (43) is not supplied with any signals other than the tracking control signal, and the spindle motor control circuit (44) is supplied with the spindle motor control signal. To continue the forward rotation of the prisoner (control signal is supplied, pickup (4)
The scanning continues.

During this set meal, the tracking control circuit of the pickup operates, and this output is supplied to the feed motor (5), which scans the lower surface of the disk and moves it to the movable base (6).
is in the outer circumferential direction of the disk (2), that is, the lower linear portion (12
a) Move above (14a) in the direction of connecting portions (12b) and (14b). When the scanning of the lower surface of the disk is completed, the movable base (6) reaches the tips of the upper linear portions (12C) (14C) via the connecting portions (12b) (14b) '2-, and reaches the top of the upper surface of the disk (2). When the inner circumference position is reached, the spindle motor simultaneously rotates in the opposite direction, and the pickup (4) scans the bottom surface of the disk in the same way as the movable base (
6) moves in line with the outer circumference of disk +21.

While the pickup (4) is scanning the disk (2), the lower linear part (12 (14) of the movable base (6) is shown in FIG. 7. The guide ball 06) is engaged. The reason why there is a fitting shape in the hole is to prevent the pickup 141 from wobbling in the upward and horizontal directions and to improve the tracking accuracy of the pickup.The upper straight portion (12C) The same applies to the movement in (14C).

FIG. 8 shows the moving state of the movable base (6) at the connecting portions (12b) (14b). The pinion sleeve (9a) and the roller shaft (10 are loosely fitted into the guides a, (16) Entry movement plan B1 is made. When the scanning of the upper surface of the disk is completed, the movable base (6) returns to the holding position and enters a standby state, and the spindle motor stops.

Comparison circuit (As a result of the comparison using @, the two do not match. In other words, the lower side of the disk (2), which is the opposite side of the pickup (4), is pressed with the A/B designation button (1a). The desired playback surface If not, after a very short playback operation on the innermost circumference of the disc, the movable base (6) immediately connects the lower straight parts (12a) (14a) and the connecting parts (12b) (14).
b) and the feed motor control circuit so as to reach the innermost circumference of the upper surface of the disk +21 via the upper linear part (12CX14c)! 43) The feed motor (5) is controlled by i, and the pickup (4) starts scanning the upper surface of the disk (2).At this time, the spindle motor is controlled so that it rotates in the opposite direction to scanning the lower surface of the disk. Controlled by circuits (goods). When the scanning of the upper surface of the disk is completed, the movable base (6) reaches the innermost periphery of the lower surface of the disk after passing through the connecting parts (12b) and (14b) and the lower linear part (12 and 14), and reaches this position. Then, the spindle motor rotates in the opposite direction again, and the lower surface of the disk of the pickup (4) is further scanned.When the scanning of the lower surface of the disk is completed, the movable bee cutter 6) returns to the holding position and enters the standby state, and the spindle motor (5) is stopped.

Therefore, load the disc (2) on the disc tray (3) with the A side facing down and the B side facing up, and press the A/B designation button (1a).
) to specify the A side, or if you install it with the B side at the bottom and the A side at the top and specify the 8 side, the movable base (6)
moves from A-B to A4C-A in Figure 6, and in the opposite case to the above, that is, when it is installed with side A facing down and side B facing up, 8
If you specify the surface, or specify the A side with the B side on the bottom and the A side on the top, the movable base (6) will be A+B-4A-
Moves +C-+A→B→A. However, the first A-+
When moving B-A, reproduction of the lower surface of the disk is performed only for a very short time in order to detect the opposing surface.

FIG. 9 is a flowchart showing the series of operations described above. In this flowchart, PU is picked up (4
), and step ω indicates that the pickup (4) reaches the innermost circumference of the lower surface of the disk (Step 151) indicates that the pickup (4) reaches the innermost circumference of the upper surface of the disk.

In this embodiment, once the A/B designation button (1a) is used to touch either side A or B, once the playback of the specified disc side is completed, the playback of the other side is automatically started. Continuous (detection means), (42)
... Comparison circuit (comparison means).

When the regeneration of only the designated Ic surface is completed without regeneration, it is also possible to return the movable base (6) to the full-length position and regenerate only one surface.

(G) Effects of the Invention As described above, according to the present invention, it is possible to start playback from a desired disc surface without having to consider the front or back side of the disc when loading the disc, and the disc player has excellent operability. It is extremely effective.

[Brief explanation of drawings]

The drawings all relate to one embodiment of the present invention, and FIG. 1 is a circuit diagram;
Figure 2 is an external view, Figure 3 is a perspective view of the main parts, Figure 4 is an explanatory diagram of the guide ball, Figure 5 is a top view, Figure 6 is a side view, and Figure 7 is an explanatory diagram during horizontal movement. , Section 8 is an explanatory diagram during a U-turn, and FIG. 9 is a flowchart.

Claims (1)

[Claims] (1) A pickup that reproduces information from both the front and back surfaces of a disc, a disc mounting section on which the disc is mounted, and a detection means that detects the opposing surface of the pickup when the disc is mounted on the disc mounting section. a designation means for designating a desired playback surface on the disc; a comparison means for comparing the output of the detection means and the output of the designation means; a pickup movement for moving the pickup to the playback surface based on the output of the comparison means. A double-sided disc player comprising means.