JPH05303816A - Md detecting mechanism, md shutter opening and closing mechanism and cd/md compatible player using the same - Google Patents

Abstract

PURPOSE:To provide the player capable of using both CD and MD. CONSTITUTION:An MD is placed on a tray 14, and when the MD comes under a sensor arm 10, a contact member 13 is brought into contact with a cartridge of the MD and is pushed back, so that the sensor arm 10 is slid. Consequently, a sensor arm link 7 is turned, and a shutter arm 1 is pushed by the sensor arm link 7, and is turned. A 1st rack gear 15 and a shutter arm gear 4 are meshed together, and the tip of the shutter arm is turned to an MD shutter opening starting position. A shutter arm ring 2 is inserted into a shutter opening and closing groove, and the shutter is released from its locking to open the shutter. Upon completion of opening the shutter, a 2nd rack gear 16 is meshed with the shutter arm gear 4, and the shutter arm 1 is fed out of the disk surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD / MD dual-use disc player capable of using both CD and MD.

[0002]

2. Description of the Related Art Conventionally, a compact disc (hereinafter referred to as C
(Abbreviated as “D”) has become popular and various CD players have been developed. FIG. 4 is an external view of a CD. FIG. 4 (A) shows
The top view and FIG. 4B are cross-sectional views. The outer diameter of the CD is
There are 12 cm and 8 cm, and the thickness is 1.2.
mm, the central opening has a diameter of 15 mm.

Various methods have been devised as a conventional CD loading method, one of which is the front loading method. FIG. 5 is a schematic view of a conventional CD front loading method.
In the figure, 31 is a tray, 32 is a CD mounting space, 33 is a U-shaped hole, 34 is a CD, 35 is an optical pickup, 36 is a turntable, and 37 is a part of the case. In FIG. 5, the solid line shows the state in which the tray is pulled out, and the dotted line shows the state in which the tray is pulled in.

The front loading system is a CD loading space 3 on a tray 31 which is projected in front of the player.
The CD 34 is placed on the disc 2 and the tray 31 is pulled into the player to transfer the CD 34 onto the turntable 36 in the player for loading. The tray 31 has a U-shaped hole 33 through which the turntable 36 and the CD 34 are clamped and information is read by the optical pickup 35. The optical pickup 35 is arranged behind the turntable 36 and seeks in the front-rear direction. With such an arrangement, downsizing of the entire player is realized.

Recently, a mini disk (hereinafter abbreviated as MD) has newly appeared as an audio medium (JAS).
Journal, 1991, August issue, pages 37-42).

FIG. 6 is an external view of the MD, which is shown in FIG.
Is a bottom view, and FIG. 6B is a side view. In the figure, 41 is M
A D cartridge, 42 is a shutter, and 43 is a shutter opening / closing groove. As shown, MD cartridge 41
Has an approximately thin plate shape, and has a width of about 72 mm, a length of about 68 mm, and a thickness of about 5 mm. An optical disk or a magneto-optical disk on which information is actually recorded is stored in this cartridge. The shutter 42 is of a slide type. When a protrusion is inserted into the shutter opening / closing groove 43 and the shutter 42 is pressed, a lock (not shown) of the shutter 42 is released, and by further pressing, the shutter 42 slides and the shutter 42 moves. open. The opened shutter 42 is locked again by sliding it back to the closed position.

For writing and reading of information, the shutter 42 is slid to expose the read / write opening provided in the MD cartridge 41, and the disc accommodated in the MD cartridge 41 is irradiated with light to reflect light. Information is read by receiving light, and information is written using magnetism.

For 12 cm and 8 cm CDs, equipment has been developed which allows both of them to be played by one player. It is considered that with the spread of MD, there is an increasing demand for a so-called compatible device that can use both CD and MD. The compatibility machine is more advantageous to the user in terms of space and cost than a case where a CD player and an MD player are separately provided.

The MD is designed to record information in the same manner as a CD, and the drive system of a pickup and a motor can use the same mechanism as a conventional CD player. However, since the MD and the CD have different shapes as described above, they cannot be used as they are. One of the reasons is the opening and closing of the shutter.
In the case of a CD, the disc itself is exposed, but in the MD, the disc is contained in the cartridge, and it is necessary to open the shutter to expose the disc inside. Therefore, when considering a CD and MD compatible machine,
Only in the case of MD, a mechanism for opening and closing the shutter is necessary. Further, in order to realize a CD / MD compatible machine, it is necessary to load the MD as well as the CD.

As described above, the opening and closing of the MD shutter can be performed by inserting the protrusion into the shutter opening and closing groove and pressing the shutter.

A method for opening and closing the shutter of the MD will be described below. FIG. 7 is a schematic view showing an example of the shutter opening / closing mechanism of the MD. In the figure, 51 is a tray and 52 is an MD
The cartridge 53 is a shutter opening / closing pin.

FIG. 7 is illustrated on the premise of the front loading method described as the conventional CD loading method. The tray 51 is assumed to move from right to left during loading. At that time, the MD is placed on the tray 51 so that the shutter faces the side wall. When loading is started and the tray 51 is moved to a predetermined position, the shutter opening / closing pin 53 is projected and inserted into the shutter opening / closing groove provided in the MD cartridge 52. Even if the shutter opening / closing pin 53 is not moved back and forth, as the tray 51 moves further,
The shutter opening / closing pin 53 pushes and opens the shutter of the MD.

On the contrary, when closing the shutter, the shutter opening / closing pin 53 is caused to project as the tray 51 moves from the left to the right, and the tray opening / closing pin 53 is inserted into the shutter opening / closing groove on the opposite side to the opening of the shutter. After that, the shutter is closed as the tray 51 moves.

Thus, the shutter of the MD can be opened and closed by the simple structure of the shutter opening / closing pin 53.
However, in this case, since the direction in which the MD is placed is the direction in which the shutter faces the side wall, the optical pickup for reading the MD information needs to be arranged beside the turntable. As described with reference to FIG. 5, it is advantageous to arrange the optical pickup behind the turntable in order to reduce the size of the player. The above-mentioned method cannot be applied to the opening and closing of the MD shutter in a player in which an optical pickup is arranged behind a turntable.

The mechanism for opening and closing the shutter is a CD
Since it is not necessary at the time of, it is necessary to determine the type of the loaded disc and operate the mechanism for opening and closing the shutter.

[0016]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a player capable of utilizing both CD and MD. ..

[0017]

According to the present invention, in the invention as set forth in claim 1, a sensor arm base and a sensor arm are provided in an MD detection mechanism for detecting passage of MD when MD or CD passes. One or more sensor arm fulcrums provided on the base, and a sensor arm slidably locked to the sensor arm fulcrums,
The sensor arm has a contact member that does not contact the CD when passing the CD and contacts the MD cartridge when passing the MD, and the contact member contacts the MD cartridge.
The sensor arm slides when the contact member is retracted in a direction substantially perpendicular to the direction of movement of the D cartridge, and the MD
Is detected.

According to the second aspect of the invention,
In an MD shutter opening / closing mechanism for opening and closing an MD shutter, a shutter arm rotatably supported at one point and abutting the MD shutter, a shutter arm urging means for urging the shutter arm to an initial position, and a shutter arm Is provided with a shutter arm guide for restricting the movement of the.

According to the third aspect of the invention, when the MD and the CD are conveyed, in the MD shutter opening / closing mechanism that is biased only when the MD is conveyed, the shutter arm pivotally supported at one point. And a fan-shaped shutter arm gear that interlocks with the shutter arm around the fulcrum of the shutter arm, a shutter arm biasing unit that biases the shutter arm to an initial position, an MD detection mechanism, and an MD detection mechanism, The present invention is characterized by having a sensor arm for rotating the shutter arm at the time of MD detection, and first and second rack gears provided on the tray.

According to a fourth aspect of the present invention, in the MD shutter opening / closing mechanism according to the third aspect, the MD detecting mechanism according to the first aspect is provided as the MD detecting mechanism.

Further, in the invention described in claim 5, the MD / CD dual-use disc player is characterized by having the MD shutter opening / closing mechanism according to claims 2 to 4.

[0022]

According to the present invention, in the MD detecting mechanism according to claim 1, when the MD is conveyed and passes through the detecting mechanism, the abutting member is retracted so that the sensor arm slides. Further, by locking the interlocking member, it becomes possible to control the mechanism section according to the MD detection result.

In the MD shutter opening / closing mechanism according to claim 2, the shutter arm contacts the MD cartridge only during MD conveyance, and the movement of the shutter arm regulated by the shutter arm guide causes the shutter arm to be inserted into the shutter opening / closing groove of the MD. It can be inserted and the shutter of the MD can be opened. Moreover, since the shutter arm is biased to the initial position by the shutter arm biasing means, the shutter of the MD can be pressed to close the shutter.

Further, in the MD shutter opening / closing mechanism according to the third aspect, when the MD is conveyed, the MD detecting mechanism detects the MD and rotates the interlocking sensor arm and shutter arm to move the first rack gear to the first rack gear. The shutter arm gear is engaged, the shutter arm is arranged in front of the MD, and the shutter is opened as the MD is conveyed. Then, the second rack gear and the shutter arm gear are used to move the shutter arm to a position not related to the driving of the MD. The shutter of the MD can be opened by placing it on the. Further, the shutter can be closed by the reverse operation.

Further, in the MD shutter opening / closing mechanism according to claim 4, the MD detecting mechanism of the MD shutter opening / closing mechanism according to claim 3 is the MD according to claim 1.
By using the detection mechanism, the MD shutter opening / closing device can be driven with a simple configuration.

According to the fifth aspect of the invention, by using the MD shutter opening / closing mechanism according to the second to fourth aspects, it is possible to provide a disc player capable of using both MD and CD.

[0027]

1 is a schematic view showing a first embodiment of a shutter opening / closing device in an MD / CD dual-use player of the present invention, and FIG. 2 is an enlarged view of a shutter arm guide used in the embodiment of FIG. Is. In the figure, 1 is a shutter arm, 2 is a shutter arm ring, 3 is a shutter arm fulcrum, 5 is a shutter arm biasing spring, 6 is a shutter arm guide, and 20 is an MD.

The shutter arm 1 is rotatably fixed about a shutter arm fulcrum 3. Further, a predetermined tension is applied to the shutter arm 1 by a shutter arm biasing spring 5.
A shutter arm ring 2 having an uneven surface is attached to the tip of the shutter arm 1, and the shutter arm ring 2 contacts the MD 20. Since the unevenness is provided to increase the frictional resistance, it may be omitted or may be subjected to an appropriate surface treatment. Further, the shutter arm 1 is configured to penetrate a guide hole provided in the shutter arm guide 6, and the operation of the shutter arm is controlled by the shape of the guide hole. The outline of the shutter arm guide 6 and its guide hole is shown in FIG.

The operation of the first embodiment of the present invention will be described.
The MD is set on the tray so that the shutter comes in the loading direction. At this time, the shutter arm 1 is moved to the M
When D is loaded, it is arranged at a position where it abuts against the end of the MD cartridge. Further, the height of the shutter arm 1 can be adjusted by the shutter arm guide 6 as shown in FIG.
It is held at the inner position, that is, at a position higher than the height at which the shutter opening / closing operation described below is performed. As already mentioned, the thickness is different between CD and MD. Therefore, when the disc is MD when the disc is placed on the tray and conveyed, the upper side of the cartridge of the MD contacts the shutter arm ring 2 at the tip of the shutter arm 1, but the disc is the CD. The CD passes under the shutter arm 1 without coming into contact with the shutter arm ring 2. By this, MD is detected and MD
The subsequent opening and closing operations of the shutter can be performed only when is loaded.

When the MD is loaded, the end of the MD cartridge contacts the shutter arm ring 2. With the transfer of the MD, the shutter arm is pushed and rotated by the MD cartridge. Then, as the shutter arm 1 moves, the position of the guide hole of the shutter arm guide 6 through which the shutter arm 1 penetrates changes, and the shutter arm 1 is lowered to a lower position. Then, the shutter arm ring 2 that was in contact with the MD cartridge is inserted into the shutter opening / closing groove of the MD.

The MD is conveyed as it is, and the shutter of the MD is pushed and opened by the shutter arm ring 2. After the shutter is fully opened, by further transporting the MD, the shutter arm ring 2 moves to the front surface of the shutter so as to ride on the shutter portion, and the loading of the MD is completed.

On the contrary, when the MD is taken out, the MD
The shutter arm ring 2 located on the front surface of the shutter is pressing the shutter by the tension of the shutter arm biasing spring. for that reason,
When the shutter arm 1 rotates with the movement of the MD, the shutter moves together with the shutter arm ring 2, and the shutter can be closed.

As described above, the MD can be set on the tray so that the shutter comes in the loading direction, loaded and read, and the optical pickup can be arranged at the rear of the turntable. In addition to this, the shutter of the MD can be opened and closed. Further, the shutter arm guide 6 adjusts the height of the shutter arm 1 so that it also has a function of detecting MD.

However, the loading of the disc requires the operation of placing the disc on the turntable after the disc is conveyed onto the turntable. There are generally two methods for this operation method, one of which is a method of lowering the tray and placing a disk on the turntable. When this method is used, the shutter opening / closing mechanism described above also needs to be lowered when the loaded disc is an MD. As a method of lowering the shutter opening / closing mechanism, by rotating the shutter arm 1,
Various methods are conceivable, such as inserting a protrusion into a groove provided in advance on the tray, and configuring the shutter opening / closing mechanism to move the shutter opening / closing mechanism in conjunction with the descent of the tray.

3A and 3B are schematic views showing a second embodiment of the shutter opening / closing device in the MD / CD dual-use player of the present invention. FIG. 3A is a top view and FIG. 3B is a side view. is there. In the figure, 1 is a shutter arm, 2 is a shutter arm ring, 3 is a shutter arm fulcrum, 4 is a shutter arm gear, 5 is a shutter arm urging spring, 7 is a sensor arm link, 8 is a sensor arm link fulcrum, and 9 is Sensor arm base, 10 sensor arm, 11 and 12 sensor arm fulcrum, 13 contact member, 14 tray, 15 first rack gear, 16 second rack gear, 17 12 cm CD mounting space,
18 is an 8 cm CD mounting space, 19 is an MD mounting space, and 21 is a mechanical base.

The shutter arm 1 is rotatably fixed to a mechanical base 21 at a shutter arm fulcrum 3. A shutter arm biasing spring 5 is provided at the shutter arm fulcrum 3 to apply tension to the shutter arm 1. The shutter arm biasing spring 5 may be of a type in which the shutter arm 1 is simply pulled by a spring as in the first embodiment, but in this embodiment, the shutter arm 1 has a large rotation range and is extended. Since the spring may interfere with the disk, the one surrounding the shutter arm fulcrum 3 as shown in FIG. 3 is used. One end of the shutter arm biasing spring 5 is fixed to the mechanical base 21, and the other end is locked to the shutter arm 1.

A shutter arm gear 4 is provided at the shutter arm fulcrum 3 and is configured to rotate in association with the rotation of the shutter arm 1. At the tip of the shutter arm 1, there is provided a shutter arm ring 2 having irregularities or fine sawtooth grooves formed on its surface in order to increase frictional resistance with the contact surface of the shutter. You may form the layer with large frictional resistance.

The sensor arm 10 is slidably attached to the sensor arm base 9 at sensor arm fulcrums 11 and 12. A contact member 13 is provided on the sensor arm 10. Further, the sensor arm 10 is configured to interlock with the sensor arm link 7. The sensor base 9 is fixed to the mechanical base 21.

The sensor arm link 7 is rotatably fixed at the sensor arm link fulcrum 8, and rotates in response to the sliding of the sensor arm 10. The tip of the sensor arm link 7 is arranged so as to contact the shutter arm 1 or the shutter arm ring 2, and when the shutter arm 1 is in a standby state, the sensor arm link 7 is rotated to push the shutter arm 1 to release the shutter. The shutter arm gear 4 interlocked with the arm 1 is rotated to a position where it meshes with the first rack gear of the tray 14.

The tray 14 is provided with an MD mounting space 19 in addition to the 12 cm CD mounting space and the 8 cm CD mounting space which have been conventionally provided.
Further, first and second rack gears 15 and 16 are provided on the side of the tray 14, and mesh with the shutter arm gear 4 to rotate the shutter arm 1 as the tray 14 moves.

The operation of the second embodiment will be described. First, in a state in which a disc can be placed on the tray 14, each unit is in a standby state. That is, the shutter arm 1
The tension of the shutter arm biasing spring 5 causes the tray 14 to be positioned at the end of the moving area. At this time, the teeth of the shutter arm gear 4 are at positions where they do not mesh with the rack gears 15 and 16 provided on the tray 14. The sensor arm 10 is in a state where the contact member 13 is projected on the moving path of the MD, and the shutter arm ring 2 is in contact with the sensor arm link 7 (position in FIG. 3).

M is placed in the MD mounting space 19 on the tray 14.
A case where D is placed will be described. In this case, the mounting direction of the MD is set such that the shutter is at the back of the player, as in the first embodiment.

When the movement of the tray 14 is started and the MD comes under the sensor arm 10, the contact member 13 contacts the cartridge of the MD, and the contact member 13 moves as the MD moves.
Is pushed away, and the MD is detected by this operation. The sensor arm 10 slides in a direction substantially perpendicular to the movement direction of the tray 14 in conjunction with the push-out of the contact member 13. As the sensor arm 10 slides, the sensor arm link 7 rotates, the tip of the sensor arm link 7 pushes the shutter arm 1, and in the direction opposite to the tension of the shutter arm biasing spring 5, the shutter arm 1 Rotates. Along with the rotation of the shutter arm 1, the tooth tips of the shutter arm gear 4 are rotated so as to be on the movement line of the rack gear of the tray 14 (position in FIG. 3).

While the MD cartridge is pushing the contact member 13, the first rack gear 15 provided on the tray 14 reaches the shutter arm gear 4, and both gears mesh with each other, so that the shutter arm gear 4 moves. It is rotated with the movement of the first rack gear 15. The shutter arm 1 is rotated along with the rotation of the shutter arm gear 4, and the tip of the shutter arm 1 is rotated until the shutter opening start position of the MD is reached. Tray 1 in this position
The engagement between the first rack gear 15 of No. 4 and the shutter arm gear 4 is completed. The shutter arm 1 tries to return to the standby position by the tension of the shutter arm urging spring 5, but at this time the MD
Reaches the tip position of the shutter arm 1 (position in FIG. 3).

The shutter arm ring 2 at the tip of the shutter arm 1 contacts the MD cartridge and is pushed as the MD moves, and the shutter arm 1 continues to rotate. At this time, the shutter arm ring is inserted into the shutter opening / closing groove provided in the MD cartridge,
The shutter arm ring 2 unlocks the shutter and starts opening the shutter.

The MD moves as it is, and the shutter of the MD is pushed and released by the shutter arm ring 2. After the shutter is fully opened, further movement of the MD causes the shutter arm ring 2 to move to the front surface of the shutter so as to ride on the shutter portion and complete the opening of the shutter (position in FIG. 3).

At the time when the shutter is released, the second rack gear 16 provided on the tray 14 reaches a position where it meshes with the shutter arm gear 4. The shutter arm 1 is further rotated by both gears and is sent out to a position outside the disk surface (position in FIG. 3).

In the process of carrying out the MD, the second rack gear 1
6, the shutter arm gear 4 rotates, the shutter arm 1 rotates to the shutter open completion position of the MD cartridge, and the shutter arm ring 2 contacts the front surface of the shutter of the MD (position in FIG. 3). Second
After the engagement between the rack gear 16 and the shutter arm gear 4 is completed, the shutter arm ring 2 presses the shutter of the MD cartridge by the tension of the shutter arm biasing spring 5. At this time, since the surface of the shutter arm ring 2 is provided with irregularities, the shutter and the shutter arm ring 2 do not slip and move with the rotation of the shutter arm 1 to close the shutter (the position in FIG. 3). ).

Upon completion of closing the shutter of the MD cartridge, the first rack gear 15 and the shutter arm gear 4 mesh with each other, the shutter arm 1 is rotated to a position near the standby position (position in FIG. 3), and then opened. , Tension causes the shutter arm 1 to move to the standby position (see FIG.
Return to the inside position).

When a CD is placed on the tray 14, the CD
Does not touch the contact member 13 and passes below it, so the sensor arm 10, the sensor arm link 7, and the shutter arm 1 do not move from the standby position. Further, the shutter arm gear 4 does not mesh with the first and second rack gears provided on the tray 14. Therefore, conventional CD loading is performed.

As described above, the MD can be set on the tray so that the shutter comes in the loading direction, loaded and read, and the optical pickup can be arranged at the rear of the turntable. In addition, the shutter of the MD can be opened and closed by driving the shutter arm 1 and the like only when loading the MD.

According to the shutter opening / closing mechanism described as the second embodiment, the method of placing the disc on the turntable by raising the turntable from below the disc is used. However, it is possible to open and close the shutter of a good MD. That is, the shutter arm 1 is located at the end of the tray 14 in the standby position, and after the shutter is opened,
It is placed at a position rotated from the cartridge surface of the MD to the back of the disc by the second rack gear 16. Therefore, it is possible to retract the shutter arm 1 to a region other than the region where the maximum diameter of 12 cmCD rises.

[0053]

As is apparent from the above description, according to the present invention, it is possible to detect an MD with a simple structure, and by providing a shutter opening / closing mechanism, it is possible to improve the MD detection result. Therefore, the shutter of the MD can be opened and closed. Further, according to the shutter opening / closing mechanism of the present invention, the MD can be set in the tray so that the shutter comes in the loading direction, loaded and read, and the optical pickup is arranged at the rear of the turntable. Therefore, the player can be downsized. Furthermore, by installing such a shutter opening / closing mechanism, M
The effect is that a player for both D and CD can be provided.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a shutter opening / closing device in an MD / CD dual-use player of the present invention.

2 is an enlarged view of a shutter arm guide used in the embodiment of FIG.

FIG. 3 is a schematic diagram showing a second embodiment of the shutter opening / closing device in the MD / CD dual-use player of the present invention.

FIG. 4 is an external view of a CD.

FIG. 5 is a schematic diagram of a conventional CD front loading method.

FIG. 6 is an external view of an MD.

FIG. 7 is a schematic view showing an example of a shutter opening / closing mechanism of an MD.

[Explanation of symbols]

 1 shutter arm 2 shutter arm ring 3 shutter arm fulcrum 4 shutter arm gear 5 shutter arm urging spring 6 shutter arm guide 7 sensor arm link 8 sensor arm link fulcrum 9 sensor arm base 10 sensor arm 11, 12 sensor arm fulcrum 13 Contact member 14 Tray 15 First rack gear 16 Second rack gear 17 12cm CD mounting space 18 8cm CD mounting space 19 MD mounting space 20 MD 21 Mechanical base

Claims (5)

[Claims] 1. An MD detection mechanism for detecting passage of MD when MD or CD passes, a sensor arm base, one or a plurality of sensor arm fulcrums provided on the sensor arm base, and the sensor arm fulcrum. The sensor arm slidably locked to the sensor arm is provided on the sensor arm and does not contact the CD when passing through the CD.
There is a contact member that contacts the MD cartridge when passing through D, the contact member contacts the MD cartridge, and the sensor member slides by retracting the contact member in a direction substantially perpendicular to the traveling direction of the MD cartridge. MD detection mechanism characterized by detecting the. 2. An MD shutter opening / closing mechanism for opening and closing an MD shutter, comprising a shutter arm rotatably supported at one point and abutting the MD shutter, and a shutter arm urging member for urging the shutter arm to an initial position. And a shutter arm guide for restricting the movement of the shutter arm.
Shutter opening / closing mechanism. 3. When the MD or the CD is transported, the MD
In an MD shutter opening / closing mechanism that is urged only when a sheet is conveyed, a shutter arm that is rotatably supported at one point, a fan-shaped shutter arm gear that interlocks with the shutter arm around a fulcrum of the shutter arm, and a shutter arm. Shutter arm urging means for urging the shutter to the initial position, the MD detection mechanism, and the MD detection mechanism,
An MD shutter opening / closing mechanism, which has a sensor arm for rotating the shutter arm at the time of MD detection, and first and second rack gears provided on the tray. 4. The MD shutter opening / closing mechanism according to claim 3, comprising the MD detecting mechanism according to claim 1 as the MD detecting mechanism. 5. An MD / CD dual-use disc player comprising the MD shutter opening / closing mechanism according to any one of claims 2 to 4.