JPH03212858A - Double-side playing disk player - Google Patents

Abstract

PURPOSE:To enable the subject player to commence playing even in the case of setting upside down a disk recorded with information on one side by changing the read surface to the other side to read the recorded information when the recorded information cannot be read from a position corresponding to an information recorded area on one side of the disk. CONSTITUTION:When it is decided that a signal cannot be read out of a disk, a carriage 13 is moved outward to be separated from a 2nd guide member 9 and fitted with a holding pin 24, so that claw parts 32a and 32b are turned into a combining state. Afterward, a planetary gear 28 is rotated in an inner toothed sun gear 26, and rotary member 25 is rotated, and then a carriage 13 is started to rotate in the opposite direction. When the movement of the carriage 13 to the upper side is detected, a motor is reversely rotated, and the carriage 13 is separated from the holding pin 24 to be moved onto a 1st guide member 8, so that the recorded surface on the upper side of the set disk 1 is started to play. By this method, even when the disk recorded with information on its one side is set upside down, the player is capable of playing the disk.

Description

[Detailed description of the invention] Technical field The present invention relates to a double-sided disc player.

Background Art In a double-sided performance disc player, in the case of a disc with information recorded on both sides (A side and B side), such as a video disc, it is necessary to take out the disc in the middle of playing both sides, turn it over, and set it again. It is possible without. By the way, when setting a disc in a player, unless the A side of the disc is set facing a predetermined direction, playback will not start from the A side of the disc. That is, if the disc is set with the B side facing in a predetermined direction, the disc will be played from the B side.

On the other hand, in the case of a disc such as a compact disc where information is recorded only on one side, if the disc is set upside down, the disc will be ejected or stopped.

Therefore, it was necessary to reset the disc.

Summary of the Invention [Object of the Invention] An object of the present invention is to provide a double-sided disc player that can perform performances even when a disc with information recorded only on one side is set upside down. .

[Structure of the Invention] The double-sided performance disc player according to the present invention includes a means for generating a performance start command according to the seventh performance, and a means for generating a performance start command in response to a performance start command, and a means for generating recorded information from one side of the disc by a single pickup in response to a performance start command. means for intermittent reading; means for generating a reversal command signal when the pickup reads recorded information from a position corresponding to the information recording area of the disc; The device is characterized in that it includes means for switching from one side of the pickup to the other side, and means for generating a play start command when the reading side of the pickup is cut off.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a disc 1 set in the player is moved to a turntable 3 by a clamper 2.
It is designed to be clamped on top. Although not shown, the disc I is inserted and set into the player using a tray. A centering member 5 is slidably attached to a spindle 4 that rotationally drives the turntable 3, and a piers 5 is provided between the centering member and the turntable 3 upwardly with respect to the centering member. A coil spring 6 is arranged to provide the following.

The centering member 5 has a tapered surface 5a on its outer periphery, which is fitted into the center hole of the disc 1 to center the disc 1 with respect to the turntable 3.

A cylindrical first guide member 8 and a second guide member 9 are disposed parallel to the recording surface of the disc in the radial direction of the disc 1 and sandwich the disc above and below. Exit part 8a.

It is attached to the chassis 12 via the bracket 9a and the bracket 10. These first and second guide members 8, 9
A carriage 13 is provided so as to be removably attached thereto.

The carriage 13 is equipped with an optical pickup.

A shaft 14 is rotatably provided at the front end of the carriage 13 and is rotationally driven by a motor 15 . A gear 16 and a roller 17 are attached to both ends of the shaft 14, respectively. A pair of rack members 18 and 19 are arranged parallel to the first guide member 8 and the second guide member 9 so as to sandwich the disk 1 between them, and are fixed to the chassis 12. A gear 16 fixed to one end of the shaft 14 can mesh with each of these rack members 18,19. Also, a rail member 2 is provided parallel to each rack member 18 and 19 at a position sandwiching the carriage 13.
1 and 22 are arranged and fixed to the chassis 12. A roller 17 provided at the other end of the shaft 14 rolls on this rail member 21,22. As shown in FIG. 2, the carriage 13 can rotate in the direction of arrow R around the first guide member 8 or the second guide member 9, and when rotating, the carriage 13 and the overhanging portions 8a of each guide member 8, 9 , 9a so that they do not interfere with each other]3
A notch 13a is formed in the.

Each of the outer ends of the first guide member 8 and the second guide member 9 is formed into a pointed end, and the carriage 13 can be attached to and removed from the guide member 8.9 at this pointed end. A retaining pin 24 is arranged to fit onto the carriage 13 detached from each guide member 8.9 and to hold the carriage in place of the guide member. The holding bottle 24 is a disc-shaped rotating member 25
It is planted in. The rotating member 25 is rotatably supported by a support shaft 27 implanted in an internal sun gear 26 that is arranged concentrically with the rotating member. Note that the rotating member 25
is provided to rotate along a plane that intersects with the direction in which the carriage 13 is guided by the first guide member 8 and the second guide member 9, or in this case, along a plane that is orthogonal to the guide direction of the carriage 13. Furthermore, a planetary gear 28 is meshed with the sun gear 26 .

A worm 14a is formed on a shaft 14 rotatably provided on the carriage 13, and a worm wheel 30 provided on the gear ridge 13 supports this worm 14a.
It meshes with the A shaft 31 is provided concentrically and integrally with the worm wheel 30. This shaft 31
One pawl portion 32a (FIG. 2) of the clutch is formed at the tip of the clutch, which is configured to engage the pawl portions with each other, and the other pawl portion 32b (FIG. 2) provided at the center of rotation of the planetary gear 28
(Fig. 1). The rotating member 25 is formed with a U-shaped notch 25a into which the shaft 31 can be inserted. Note that a stop member 34 is provided protruding from the rotating member 25 to slide on the planetary gear 28 and prevent the planetary gear from shifting in the axial direction.

As shown in FIG. 3, the rotating member 25 has a rail portion +4'.
A projecting portion 25b extending toward 22 (or 21) is formed, and the roller 1 separated from the rail member 22
7 is a tapered surface 25 formed at the tip of this projecting portion 25b.
c, and then fits into the four arcuate portions 25d formed at the rear of the tapered surface in a depressed manner. Thereby, the carriage 13 is positioned with respect to the holding pin 24 and the rotating member 25, and will not fall off from the holding bin 24 unless a predetermined force or more is applied. Note that in order for the roller 17 to ride on the tapered surface 25c of the overhang portion 25b from the rail member 22 (or 21), the carriage 13 must first
Whether it is necessary to rotate around the guide member 8 or the second guide member 9, as described above, the carriage 13 is formed with a notch 13a at the engagement portion with both the guide members, and this rotation (arrow R direction) is possible. A gripping member that grips the carriage 13 is composed of the overhanging portion 25b including the tapered surface 25c and the arcuate recess 25d, and the aforementioned holding pin 24.

The sun gear 26 and the planetary gears 28 described above constitute a torque transmission mechanism that transmits torque to the rotating member 25. The torque transmission mechanism, the aforementioned clutch, and the rotating member 25 also move the gripping member including the holding bottle 24 from the attachment/detachment position of one of the first and second guide members 8.9 to the attachment/detachment position of the other. Also, a reversing mechanism is configured to move the two guide members along a plane that intersects the guide direction.

The configuration of the electrical system of the double-sided disc player according to the present invention is shown.

In this player, the disk 1 is rotationally driven by a spindle motor 41, and the recorded signal is read by an optical pickup in the carriage 13. The pickup is carried by a carriage 13 that moves in the radial direction of the disk 1 by a carriage motor 15, and the information reading point (information reading optical spot) of the pickup is freely positioned in the radial direction of the disk 1. In addition, various servo systems such as spindle servo system, focus servo system, tracking servo system, and carriage servo system (
(not shown) is provided.

The spindle motor 41 and the carriage motor 15 are driven by a spindle servo system, a carriage servo system, or a performance section control circuit 45. The performance section control circuit 45 is configured to drive the spindle motor 41 and the carriage motor 15 and perform on/off control of the various servo systems (not shown) in response to commands from the system controller 47.

A band pass filter (BPF) 46 for the RF multiplied signal video FM, which is the read output of the pickup, a low pass filter (LPF) 48 for the analog audio FM signal, and a band pass filter 49 for the digital audio EFM signal.
is supplied to The video FM signal that has passed through the video FM BPF 46 is supplied to a video demodulation circuit 50, where it is demodulated to become a reproduced video signal.

The passing signal of LPF48 is 2.3MHz and 2°8M
The analog audio FM signals of the left and right channels are separated by BPFs 51L and 51R for passing only the Hz audio carrier wave component, and each analog audio signal is demodulated by FM demodulation circuits 52L and 52R to become audio signals of the left and right channels.

On the other hand, the digital audio EFM signal separated from the reproduced RF signal by the digital audio EFM signal BPF 49 is supplied to the EFM demodulation circuit 53 and the synchronization signal detection circuit 64. The EFM demodulation circuit 53 is configured to perform EFM demodulation processing on a pulse signal obtained by slicing the RF multiplied signal to form PCM data, that is, digital data including time-division multiplexed audio signals of both left and right channels and a subcode. ing. This EFM
Digital data including audio information output from the demodulation circuit 53 is supplied to a deinterleaving/interpolation circuit 54. Further, the synchronization signal detected by the synchronization signal detection circuit 64 is supplied to the system controller 7 and also supplied to the deinterleaving/interpolation circuit 54 as a timing signal. The de-interleaving interpolation circuit 54 is
In cooperation with the RAM 55, the digital data whose order has been rearranged by the interleaving performed during recording is restored to its original state and sent to the error correction circuit 56, which outputs a signal indicating that correction is impossible. The error correction circuit 56 is configured to interpolate error data in the output data by an average value interpolation method or the like. Further, the error correction circuit 56 uses CI RC (Cross Inter
leave Reed Sol.

The digital data is supplied to the deinterleaving/interpolation circuit 54 after error correction (non-code), and if correction is not possible, a signal indicating that correction is not possible is output.

The output data of the deinterleaving/interpolation circuit 54 is
A (digital-to-analog) conversion circuit 57 is supplied. The D/A conversion circuit 57 has a demultiplexer that separates digital data including time-division multiplexed left and right channel audio information for each channel, and the left and right channel audio signals are reproduced. The reproduced audio signal is passed through LPF (low pass filter) 5
After unnecessary components are removed by 8L and 58R, digital audio is output.

On the other hand, the subcode output from the EFM demodulation circuit 53 is supplied to the system controller 47. The system controller 47 includes, for example, a processor, ROM, and RAM.
, a timer, etc., and receives commands from the operation unit 68 in response to key operations.

After performing arithmetic operations based on data or programs stored in a RAM or the like, command signals such as play, search, jump, etc. are supplied to the performance section control circuit 45.

In addition, a first
Mounted sensor 66 and a predetermined size (for example, diameter 20cm)
a second mounting sensor 6 that detects the mounting of a disk (m or more);
7 are provided, and the output signals of these mounting sensors 66 and 67 are supplied to the system controller 47. The first mounting sensor 66 is, for example, 6 cI in the radial direction from the disk center.
It is provided at a position corresponding to within I1 and optically detects the attachment of the disk. Further, the second attached sensor 67 is, for example,
It is provided at a position corresponding to 6c+n to 10 cm in the radial direction from the center of the disk to optically detect the mounting of the disk.

Next, the operation of the double-sided performance disc player having the above configuration will be explained. It is assumed that a compact disc is set as disc 1 in the tray.

When the power is turned on, the carriage 13 moves along the second guide member 9 and becomes in a state where signals can be read out from the bottom of the disk 1 by the pickup, which is the initial state.

When a performance start command is issued, the system controller 47 first determines whether the tray has been inserted (closed) into the player as shown in FIG. 5 (step 71).
. When the loading of the tray is detected by a sensor (not shown), it is determined whether or not a disk is on the tray (step 72).

When a compact disc is placed, a detection signal is supplied from the first mounting sensor 66, so the system controller 47 determines whether a compact disc is set.

If both the first and second mounting sensors 66 and 67 do not generate detection signals, the disc is not set and the system is brought to a halt state (step 73). Note that when a video disc with a diameter of 20 cm or more is set as the disc, detection signals are generated from both the first and second mounting sensors 66 and 67.

If a disk is set, a closing operation of the focus servo is started (step 74). Then, it is determined whether focus has been achieved by the closing operation of the focus servo (step 75). This determination is made after a period of time long enough for focus to be achieved has elapsed since the close operation of the focus servo was started. Once the focus is achieved, closing operations of other servos such as the spindle servo system, tracking servo system, carriage servo system, etc. are started (step 76).

Next, the TOC (Table orCo) is extracted from the disk.
It is determined whether or not the recorded signal including the ``tents'' etc. can be read out (step 77). If the signal can be read from the disk, the performance operation is started (step 78).

On the other hand, if it is determined that the signal cannot be read from the disk, this becomes the inversion command signal. Therefore, it is assumed that the disk has been set upside down, and the carriage 13 is moved upward (step 79). That is, the carriage 13 is moved outward, separated from the second guide member 9, and fitted into the holding bin 24. At the same time, the clutch consisting of the pawls 32a and 32b becomes engaged. After this, the motor 15 further rotates, and the planetary gear 28
begins to move within the internal sun gear 26. Then, since the shaft 31 integrated with the worm wheel 30 is fitted into the U-shaped notch 25a of the rotating member 25, the rotating member 25 rotates as the planetary gear 28 shifts. Therefore, the carriage 13 starts reversing. System controller 47
After step 79 is executed, carriage 13 moves to disk 1.
It is determined whether the reversal has been completed so as to correspond to the upper recording surface of (step 80). When upward movement of the carriage 13 is detected by a detection means (not shown), the process moves to step 74, where each servo system operates to reverse the motor 15, and the carriage 13 separates from the holding pin 24 and moves to the second position. 1 guide member 8. After this,
The performance of the upper recording surface of the set disc 1 is started.

Also, if focus cannot be obtained in step 75, the process proceeds to step 79 and the carriage 13 is moved upward.

Although not shown in the flowchart of FIG. 5, if no signal is obtained from the upper side of the disc 1, the disc 1 may be stopped or ejected.

Further, the pickup reversing mechanism in the double-sided disc player is not limited to the above embodiment.

For example, a reversing mechanism for a pickup in a double-sided disc player as shown in the specification and drawings attached to Japanese Patent Application No. 63-81558 may be used.

Effects of the Invention As detailed above, in the double-sided disc player according to the present invention, when recorded information cannot be read by the pickup from a position corresponding to the information recording area on one side of the disc, the reading surface of the pickup relative to the disc is Recorded information is read by switching from one side to the other side. Therefore, even if a disc, such as a compact disc, in which information is recorded on only one side, is set upside down, playback will start, and there is no need to reset the disc.

[Brief explanation of drawings]

FIG. 1 is a side view including a partial cross section of the mechanical part of the double-sided playback player according to the present invention, and FIG. 2 is a side view with respect to FIG.
-■ Arrow view, Figure 3 is a detailed view of some of the main parts of the player in Figure 1, Figure 4 is a block diagram showing the electrical system configuration of the player in Figure 1, and Figure 5 is a diagram of the system controller. This is a flow cheat showing the operation. Explanation of symbols of main parts 1... Disk 3... Turntable 8.9... Guide member 13... Carriage 15... Carriage motor 47... System controller

Claims (1)

[Claims] means for generating a play start command in response to an operation; means for starting readout of recorded information from one side of the disc by a single pickup in response to the play start command; and an information recording area of the disc by the pickup. means for generating a reversal command signal when recorded information cannot be read from a position corresponding to the reversal command signal; means for switching the reading surface of the pickup relative to the disc from one surface of the disc to the other surface in response to the reversal command signal; A double-sided performance disc player comprising means for generating the performance start command when the reading surface of the pickup is switched.