JPH076489A - Disk player - Google Patents

Abstract

PURPOSE:To play back both of a CD and an MD by one disk player. CONSTITUTION:A circular recessed part 24 functioning as a placing part for a 12cm-CD, a circular recessed part 25 functioning as a placing part for an 8cm-CD, and a square recessed part 26 functioning as a placing part for the MD are formed on the upper surface of a tray 23. Sensors 31, 32 and 33 are provided in the recessed parts, 24 and 26. In the case all the sensors 31, 32 and 33 are turned on, that the 12cm-CD is placed is judged; and in the case the sensor 31 is turned off and the sensors 32 and 33 are turned on, that the MD is placed is judged; and in the case the sensors 31 and 32 are turned off and only the sensor 33 is turned on, that the 8cm-CD is placed is judged; then a signal corresponding to each case is transmitted to a controller, so that a motor is driven and the optical pickup 16 is moved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player capable of reproducing both CD (compact disc) and MD (mini disc).

[0002]

2. Description of the Related Art When playing a CD, the disc is set on a tray, the disc is pulled up to a turntable in the player body while the tray is placed, and the inner diameter of the disc is held between the turntable and the clamper. I am trying to rotate it. On the other hand, the MD has a disc housed in a square case, and when reproducing the disc, a turntable is inserted from one side of the case to be engaged with an inner diameter portion of the disc to rotate.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Not only the diameter dimension is different from D, but the clamp diameter and the clamp mechanism are also different, so that separate players had to be prepared in order to reproduce the CD and MD.

Further, since the writing position of TOC (total operation code) is different between CD and MD, only the CD or MD can read the TOC only by the conventional rest switch operating mechanism.

[0005]

In order to solve the above problems, the first invention of the present application sets a disc on a tray, pulls the disc together with the tray to a predetermined position in the main body, and rotates the disc by a turntable. Also, in the disc player in which the pits formed on the disc are optically read by the optical pickup, the tray is provided with a mounting portion according to the type of the disc, and the mounting portion or the main body is provided with the type of the disc. A number of turntables are provided according to the type of disc.The turntables can be individually moved to the clamp position.When the turntables move to the clamp position, the turntables engage the clutch. The rotation of one of them can be transmitted to the other.

In the second invention of the present application, a tray for pulling the disc into a predetermined position in the player main body, a turntable for rotating the disc pulled in the main body by the driving force of the spindle motor, and the disc are formed on the disc. In a disc player equipped with an optical pickup for optically reading pits, the turntables are provided in the number corresponding to the type of disc, and these turntables can be individually moved to a clamp position and further moved to the clamp position. In this state, the turntables are engaged with each other via a clutch so that the rotation of one can be transmitted to the other, and the optical pickup is mounted on a moving body. This moving body moves the optical pickup to the total operation code reading position. The rest switch stops its movement when Merare, also rest switch was set to be actuated by one of rest switch actuator provided on the rest switch pusher or the movable body facing the operating position of rest the switch in conjunction with the movement of the turntable.

[0007]

When the disc is pulled into the main body, the optical pickup, the spindle motor, the CD turntable and the MD turntable move in the disc direction together with the base plate. In the case of MD, the MD turntable engages with the disc as it is, and in the case of CD, the CD turntable further moves along the axis of the spindle motor to clamp the CD with the clamper.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a plan view of a disc player according to the present invention, FIG. 2 is a vertical sectional view of the disc player, and FIGS. 3A to 3C are sectional views of trays on which 12 cm CD, 8 cm CD and MD are placed. It is a figure.

The disc player has a base plate 2 arranged in a box-shaped main body 1. A sub plate 3 is attached to the lower surface of the base plate 2, and the sub plate 3 is in contact with a cam 5 which is rotated by a motor 4. By driving the motor 4, the base plate 2 moves up and down.

A spindle motor 6 is fixed to the lower surface of the vertically moving base plate 2, a shaft 7 of the spindle motor 6 penetrates through the base plate 2 and protrudes upward, and a turntable 8 for MD is fixed to the tip thereof. The turntable 8 is provided with a recess 8a for engaging with the MD on the upper surface and a clutch 8b on the lower surface.

The spindle 7 of the spindle motor 6 has a CD
The turntable 9 is rotatably inserted. The turntable 9 is located below the turntable 8, and a clutch 9a that engages with the clutch 8b when the turntable 9 rises is formed on the upper surface of the turntable 9. Further, a spring is provided between the turntable 9 and the base plate 2. 10 is disassembled and the turntable 9 is biased upward.

On the other hand, a motor 11 is provided on one side of the base plate 2, and a gear 12 rotated by the motor 11 is provided.
The fan gear 13 is meshed with the fan gear 13, the base end of the restricting piece 14 is attached to the rotating shaft of the fan gear 13, and the tip end of the restricting piece 14 is engaged with the lower part of the turntable 9 to move the spring 1
The turntable 9 is prevented from rising along the axis 7 with an elastic force of zero. The motor 11 drives to drive the gear 1
2. When the restriction piece 14 rotates counterclockwise in FIG. 2 around the base end portion via the fan-shaped gear 13, the turntable 9 rises along the shaft 7.

Two parallel rails 15 are provided on the base plate 2, and an optical pickup 16 is movably engaged between the rails 15.

Further, from one side portion of the base plate 2, a leaf spring 18 having a clamper 17 attached to the tip end portion is extended to the upper surface side of the base plate 2, and a U-shaped leaf spring 19 is extended to the lower surface side. These leaf springs 18 and 19 are connected at their base ends, and when the tip of the leaf spring 19 lowers, the tip of the leaf spring 18 also lowers.

On the other hand, the motor 2 is provided in the box-shaped body 1.
0, pulley 2 rotated by this motor 20
1. A pinion 22 which is rotated by the pulley 21 is arranged, and the pinion 22 is meshed with the rack of the tray 23. Then, by driving the motor 20, the tray 23 moves in and out through the opening 1a of the box-shaped main body 1.

The tray 23 has a circular recess 24 as a mounting portion for a 12 cm CD, a circular recess 25 as a mounting portion for an 8 cm CD, and a rectangular recess 26 as a mounting portion for an MD on the upper surface thereof. , 25, and 26 are formed with window portions 27 facing the turntables 8 and 9 and the optical pickup 16 from below, and the turntable when the tray is pulled into the box-shaped main body 1 on the lower surface of the tray 23. Grooves 28 are formed to avoid interference with 8 and 9.

The sensor 3 is provided in the recesses 24 and 26.
1, 32, 33 are provided. The sensor 31 is a 12 cm CD
Is a sensor for detecting that the
Is a sensor that detects that an MD is placed, and the sensor 33 is a sensor that detects that an 8 cm CD is placed. These sensors 31, 32, 33 do not necessarily have to be provided in the recesses 24, 26 and may be arranged in the main body 1.

The sensors 31, 32, 33 can be, for example, known optical sensors in which a light emitting diode and a photodiode are combined. That is, when all the sensors 31, 32, 33 are turned on, it is determined that the 12 cm CD is placed,
When the sensor 31 is off and the sensors 32 and 33 are on, it is determined that the MD is placed, and the sensors 31 and 32 are off,
When only the sensor 33 is on, it is determined that the 8 cm CD has been placed, and signals corresponding to each are sent to the control device,
Drive the motors 4 and 11 or the optical pickup 16
And so on.

Performances of an MD and a CD by the disc player having the above structure will be described with reference to FIGS. First, as shown in FIG. 1, the MD is placed on the tray 23 pulled out from the main body 1. Then, as described above, it is detected that the MD is mounted by a combination of turning on and off the sensors 31, 32, 33. And M
The tray 23 on which D is placed is pulled into the main body 1 by driving the motor 20, and the MD center is positioned immediately above the turntable 8.

After that, the motor 4 is driven to rotate the cam 5 to raise the spindle motor 6 and the turntable 8 together with the base plate 2. As the turntable 8 is raised, as shown in FIG.
It engages with the inner diameter portion of the disk of the MD via 7. Incidentally, MD
In the case where is detected, the motor 11 is not driven, and the turntable 9 compresses the spring 10 and remains positioned below the shaft 7. The clamper 17 is also separated upward.

On the other hand, the optical pickup 16 is a disc T
Move to the OC (Total Operation Code) reading position. Since this TOC is provided at different positions on the CD and the MD, the optical pickup 16 is based on the detection signal.
Moves.

CD (12 cm CD or 8 cm CD)
Is detected by a combination of ON / OFF of the sensors 31, 32, 33, the base plate 2 is moved up by the driving of the motor 4 and the motor 11 is driven to rotate the regulating piece 14 counterclockwise around the base end portion. Rotate in the direction. Then, the turntable 9 is released from the regulation and is lifted along the shaft 7 by the elastic force of the spring 10, so that the turntable 9 has a clutch 9a and the turntable 8 has a clutch 8b.
And are engaged. By this engagement, the turntable 9 is rotated by the spindle motor 6 via the turntable 8.

Further, as shown in FIG. 5, the clamper 17 rotates downward in synchronization with the rise of the turntable 9 to clamp the CD between the turntable 9 and the clamper 17,
The rotation of the turntable 9 is transmitted to the CD.

6 and 7 show the spring 1 according to the above embodiment.
Clutches 8b and 9 for the turntables 8 and 9
On the contrary, in this embodiment, the turntable 8 is provided with a magnet 8c, the turntable 9 is provided with an iron plate 9b attracted to the magnet 8c, and the clutches 8b and 9a are attracted by magnetic force. It is made to engage. In the case of MD, as shown in FIG. 6, the clamp mechanism is the same as in FIG.

FIG. 8 is a plan view similar to FIG. 1 showing another embodiment for mounting the sensor. In this embodiment, there are two sensors, that is, the sensor 31 (this sensor is the sensor of the previous embodiment). (Same as 31), a sensor 34 is provided. This sensor 34 is provided at a position where it is turned on by 8 cm CD and not turned on by MD.

In this case, as shown in FIG.
When the sensor 31 is turned on, it is determined that a general 12 cm CD is placed, and when the sensor 31 is turned off, the sensor 3
When 4 is on, it is determined that the 8 cm CD is mounted, and when both sensors 31 and 34 are off, it is determined that the MD is mounted, and the optical pickup is moved to the lead-in area of the MD. Then read the TOC. And TOC
If the TOC cannot be read, it is judged that there is no disc in the tray. With this configuration, the number of sensors can be reduced and the same judgment as described above can be made.

FIGS. 10 to 15 show a disc player according to the second invention, and the second invention mechanically keeps the optical pickup always TOC regardless of whether it is MD or CD.
It is designed so that it can be stopped at the reading position. Here, FIG. 10 is a plan view showing a state in which the optical pickup of the disc player according to the second invention is stopped at the TOC reading position of the MD, and FIG. 11 is a view taken along the line AA of FIG.
12 is a plan view showing a state in which the optical pickup of the disc player according to the second invention is stopped at the TOC reading position of the CD, FIG. 13 is a view as seen from the direction of arrows BB in FIG. 12, and FIG.
Is a perspective view showing the positional relationship between the rest switch and the rest switch pusher in the case of MD, and FIG. 15 is a perspective view showing the positional relationship between the rest switch and the rest switch pusher in the case of CD.

A rest switch 40 is attached to the base plate 2. When the rest switch 40 is turned on, the movement of the moving body 41 to which the optical pickup 16 is attached is stopped. Here, the rest switch 40 is turned on by a rest switch actuator 42 provided on the moving body 41 or a rest switch pusher described later.

A plate 44 is swingably supported on the base plate 2 via a shaft 43, and the plate 44 is biased upward by a plate spring 45. Further, a standing piece 46 is provided on one side of the plate 44, and the plate 4
A rest switch pusher 47 is slidably attached to the tip of 4. The rest switch pusher 47 is biased toward the moving body 41 by a spring (not shown).

The rest switch pusher 47 is provided with an upright piece 48 extending upward. The upright piece 48 is in a position where the rest switch 40 can be turned on when the upright piece 48 is in the upper position, and the rest switch 40 is in the down position.
Below.

In the above, when playing MD,
As described above, the turntable 9 for the CD is lowered, and when the turntable 9 is lowered, the lower surface of the turntable 9 comes into contact with the standing piece 46 of the plate 44 from above,
The plate 44 is swung downward against the leaf spring 45.

Then, as shown in FIG. 14, since the rest switch pusher 47 is lowered, even if the moving body 41 to which the optical pickup 16 is attached moves.
Since the moving body 41 and the rest switch pusher 47 are vertically displaced from each other, only the moving body 41 moves with the rest switch pusher 47 left as shown in FIG. 10, and the rest switch actuator of the moving body 41 is moved. 42 turns on the rest switch 40. When the rest switch 40 is turned on, the moving body 41 is stopped, and the length of the rest switch actuator 42 is set so that the optical pickup 16 substantially coincides with the TOC position of the MD at this stop position.

On the other hand, when playing a CD, the CD turntable 9 is raised as described above. Then, the plate 44 rises, and the rest switch pusher 47 is in the upper position as shown in FIG. As a result, when the moving body 41 attached with the optical pickup 16 moves, the moving body 41 hits the rest switch pusher 47,
The rest switch pusher 47 is pushed, and the standing piece 48 of the rest switch pusher 47 turns on the rest switch 40 as shown in FIG. When the rest switch 40 is turned on, the moving body 41 stops, and the length of the rest switch pusher 47 is set so that the optical pickup 16 substantially coincides with the TOC position of the CD at this stop position.

[0034]

As described above, according to the present invention,
The tray is equipped with a sensor that discriminates the disc type, and a turntable that rotates the disc is provided that corresponds to the disc type, and the turntable that corresponds to the disc type that is discriminated is engaged with the inner diameter of the disc. Alternatively, since the disc is rotated by holding the inner diameter portion, one player can be used as both a CD and an MD. Further, since only one tray and one spindle motor are required, the mechanism is simple and the device does not become large.

Further, the rest switch pusher is interlocked with the vertical movement of the turntable, the rest switch is turned on by the rest switch pusher in the case of CD, and the rest switch actuator provided in the moving body of the optical pickup in the case of MD. Since the rest switch is turned on, the optical pickup can be reliably stopped at the TOC writing position even if the TOC writing positions of the CD and MD are different.

[Brief description of drawings]

FIG. 1 is a plan view of a disc player according to the present invention.

FIG. 2 is a vertical sectional view of the disc player.

3A is a sectional view of a tray on which a 12 cm CD is placed, and FIG. 3B is a sectional view of a tray on which an 8 cm CD is placed.
(C) is a cross-sectional view of the tray on which the MD is placed.

FIG. 4 is a cross-sectional view showing a state where a turntable is inserted in the MD inner diameter portion.

FIG. 5 is a cross-sectional view showing a state where the CD inner diameter portion is clamped.

FIG. 6 is a sectional view similar to FIG. 4 showing another embodiment.

FIG. 7 is a sectional view similar to FIG. 5, showing another embodiment.

FIG. 8 is a plan view similar to FIG. 1 showing another embodiment.

9 is a flowchart explaining a disc discriminating method in another embodiment shown in FIG.

FIG. 10 is a plan view showing a state where the optical pickup of the disc player according to the second invention is stopped at the TOC reading position of MD.

FIG. 11 is a view taken along the line AA of FIG.

FIG. 12 is a plan view showing a state in which the optical pickup of the disc player according to the second invention stops at the TOC reading position of the CD.

13 is a view as seen from the direction of arrows BB in FIG.

FIG. 14 is a perspective view showing a positional relationship between a rest switch and a rest switch pusher in the case of MD.

FIG. 15 is a perspective view showing a positional relationship between a rest switch and a rest switch pusher in the case of a CD.

[Explanation of symbols]

1 ... Disc player main body, 2 ... Base plate, 4,
6, 11, 20 ... Motor, 5 ... Cam, 7 ... Spindle motor shaft, 8 ... MD turntable, 9 ... CD turntable, 10 ... Spring, 16 ... Optical pickup, 17 ... Clamper, 23 ... Tray, 24, 25, 26
... Recesses as disk mounting portions, 31, 32, 33, 3
4 ... Sensor, 40 ... Rest switch, 41 ... Moving body, 4
2 ... Rest switch actuator, 44 ... Plate,
45 ... Leaf spring, 47 ... Rest switch pusher, 48 ...
Standing piece.

Claims (2)

[Claims] 1. A tray for pulling a disc into a predetermined position in a player main body, a turntable for rotating the disc pulled in the main body by a driving force of a spindle motor, and a light for optically reading a pit formed on the disc. In a disc player including a pickup, the tray is provided with a mounting portion according to the type of the disc, and the mounting portion or the player main body is provided with a sensor for discriminating the type of the disc. The number of turntables is provided according to the type of disc,
These turntables are individually movable to the clamp position, and in the state where the turntables are further moved to the clamp position, the turntables engage with each other via a clutch so that one rotation can be transmitted to the other. Disc player. 2. A tray for pulling a disc into a predetermined position in a player main body, a turntable for rotating the disc pulled in the main body by a driving force of a spindle motor, and a light for optically reading a pit formed on the disc. In a disc player equipped with a pickup, the turntables are provided in the number corresponding to the type of disc, and these turntables can be individually moved to a clamp position, and the turntables are moved to each other in the clamp position. It is engaged via a clutch so that one rotation can be transmitted to the other, and the optical pickup is attached to a moving body, and this moving body is moved by a rest switch when the optical pickup moves to the total operation code reading position. Is stopped and the rest switch The disc player is operated by either one of a rest switch pusher that faces the operating position of the rest switch in conjunction with the movement of the turntable or a rest switch actuator provided on the moving body.