JP2003196906A - Device for detecting disk mounting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect the mounting of a disk with a small or large diameter inside a device with a simple configuration. <P>SOLUTION: When a disk 2a with a small diameter is mounted, a hook 16a of a detection plate 16 is engaged with a locking piece 14b of a rack plate 14 to prohibit the rack plate 14 from returning to its initial position. A rotary switch 20 issues a particular combination signal at that time, and a logic circuit 32 discriminates the signal to detect the mounting of the disk 2a with a small diameter. When a disk with a large diameter is mounted, a detection lever makes the rotary switch to issue another combination signal, and the logic circuit 32 discriminates the signal to detect the mounting of the disk 2a with a large diameter. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc detecting device capable of detecting whether or not a disc is present in a disc carrying path.

[0002]

2. Description of the Related Art There is known a disc reproducing apparatus which automatically conveys a disc inserted in a disc insertion port to a reproducing position to reproduce the disc. In such a disc reproducing apparatus, it is possible to detect whether or not the disc is in the transport path. In this way, by detecting the disc in the transport path, it is possible to prevent the disc from being damaged by inserting the disc into the disc insertion slot even though the disc is present in the apparatus.

In order to detect a disc in the disc transport path, in the technique disclosed in Japanese Patent Laid-Open No. 2001-155415, a light emitting / receiving element is arranged in the disc transport path. Then, when electricity is applied, these elements detect whether or not the disc is in the transport path.

[0004]

When the light-emitting / light-receiving elements are arranged in the disk transport path as described above, it is inevitable that the structure becomes complicated. SUMMARY OF THE INVENTION It is an object of the present invention to provide a disc detection device that can detect that a large / small diameter disc is inside the device with a simple configuration.

[0005]

DISCLOSURE OF THE INVENTION A disc detecting apparatus according to the present invention comprises a connecting member having an engaged portion and interlocking with a pair of detecting levers, a disc conveying means for conveying a disc, and both detecting levers having a large diameter. Locking means for locking at a position away from the disc and push-up by the inserted disc to a position where it engages with the engaged part of the connecting member, and the engaging part engages with the engaged part for detection. It is composed of a detection member that stops the return of the lever, a pair of switches that output different combination signals depending on whether or not both detection levers are in the initial position, and a logic circuit that receives outputs from both switches. Then, depending on the states of both switches, the logic circuit detects whether or not there is a disk in the transport path.

If the switch is a rotary switch including a wiring board attached to one of the main body of the apparatus and one of the detection levers and a contact attached to the other, the disk detection apparatus can be further simplified. The pair of switches output different combination signals depending on whether the detection levers are in the initial position, the large rotation position, or the small rotation position, and the logic circuit determines this output. By doing so, it is possible to detect and display whether a large or small disc is inserted or neither is inserted.

[0007]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to FIGS. Disc reproducing apparatus 1 shown in FIG.
A disc insertion opening 3 (hereinafter referred to as the insertion opening 3) for inserting the disc 2 is provided on the front surface of the. Inside the main body 1a of the apparatus (hereinafter abbreviated as the main body 1a), a feed roller for holding the disc 2 inserted from the insertion port 3
4 and a guide plate 5 are provided so that the disc 2 can be conveyed by the rotation of the feed roller 4. The feed roller 4 and the guide plate 5 serve as a conveying unit 6.

The guide plate 5 has a pair of detection levers 7a and 7b which rotate according to the size of the disc, and the detection levers 7a and 7b which rotate when the large-diameter disc is conveyed to the reproducing position. Locking lever 8 (locking means) to be fastened to and the rod plate that moves back and forth in conjunction with the rotation of each detection lever 7a, 7b.
9a, 9b and rod plate 9 when this rod plate moves forward
Stop levers 10a, 10b are provided which are disengaged from the pressing pieces 9c of a, 9b and elastically return from the inside of the main body. Further, a turntable 11 and a clamper 12 are arranged inside the main body 1, and the clamper 12 is supported by a support plate 13 so as to be able to come into contact with and separate from the turntable 11.

The pair of detection levers 7a and 7b are provided with a contact piece 7c that engages with the disk 2 inserted into the insertion slot 3 and a gear portion 7e at the center of rotation, and one detection lever 7a (FIG. 6). On the left side), an arc-shaped long groove 7d that can be engaged with the first pin 8a of the locking lever 8 is formed. This pair of detection levers 7a,
The gear portion 7e of 7b has a rack 1 of a rack plate 14 (connecting member).
4e is meshed. The rack 14e is meshed with the gear portion 7e so as to rotate the detection levers 7a and 7b synchronously in opposite directions. Then, a spring 15 is stretched between the rack plate 14 and the guide plate 5, and the spring 1
The reference numeral 5 urges the detection levers 7a, 7b to rotate in a direction in which the contact pieces 7c close the insertion opening 3 via the rack plate 14. And
When the disc 2 is inserted into the insertion slot 3 and one of the detection levers 7a rotates clockwise, the rack plate 14 moves to the other detection lever.
Rotate 7b counterclockwise.

At the position between the insertion opening 3 and the clamper 12 on the guide plate 5, there is provided a detection plate 16 (detection member) which pushes up the tip of the disc 2 when the disc 2 is inserted into the main body 1a. Installed. As shown in FIG. 2, the detection plate 16 is formed of an extremely thin leaf spring, and its base end is fixed to the guide plate 5 with a screw 17. The hook 16a (engagement portion) formed at the tip of the detection plate 16 is engaged with the inclined cam 14a and the locking piece 14b (engagement portion) formed on the rack plate 14. Further, as shown in FIG. 3, a sliding contact piece 16b made of synthetic resin is attached to an intermediate position on the lower surface of the detection plate 16, and the sliding contact piece 16b is projected into the disc transport passage.

The locking piece 14b of the rack plate 14 is formed to have substantially the same width as the hook 16a, and has a projection 14 having a length about half the hook width.
c and the receiving surface 14d are formed. The inclined cam 14a is provided at a position separated from the locking piece 14b by the width of the hook 16a. The locking piece 14b is located above the hook 16a when the rack plate 14 is not moving. Then, the rack plate 14 moves against the force of the spring 15, and the hook 16
After a is pushed up from the guide plate 5, the rack plate 14
When returned by the force of, the receiving surface 14d enters under the hook 16a. At this time, the protrusion 14c of the locking piece 14b abuts the side surface of the hook 16a and is guided by the guide plate 1 by a length half the width of the hook 16a.
4 Return movement is prohibited. That is, the hook 16a is the locking piece 14
When engaged with b, the rack plate 14 is retained at the position where the rack plate 14 has returned and moved by half the width of the hook 16a.
The a and 7b are retained at positions slightly rotated from the initial position.

A rotary switch 20 is attached to one detection lever 7a. This rotary switch 20 is shown in FIG.
Contact attached to the bottom of the detection lever 7a as shown in
21 and a wiring board 22 attached to the guide plate 5. Three contact pieces 23 are formed on the contactor 21, and the wiring board
Four conductive parts that are in contact with the respective contact pieces 23 are formed on 22. These conductive portions are, as shown in FIG. 5, a long conductive portion 24 that slidably contacts the contact piece 23 throughout the entire movement of the contactor 21, and the contact piece 23 from the middle of the movement of the contactor 21 to the end of the movement. It is composed of a short conductive portion 25 that is in sliding contact with the first conductive portion 26 that is in sliding contact with the contact piece 23 before the contact 21 starts to move and a second conductive portion 27 that is in contact with the contact piece 23 at the end of movement.

On the wiring board 22, the contact piece 23 has a first conductive portion.
Before coming off the 26 and contacting the short conductive part 25, the first conductive part 26
A blank portion 28 is formed so as not to contact any of the short conductive portions 25. The rotary switch 20 constitutes first and second switches. As shown in FIG. 5, the first switch 30 includes a long conductive portion 24, a first conductive portion 26, and a second conductive portion.
The second switch 31 is composed of a long conductive portion 24 and a short conductive portion 25.

In the rotary switch 20, when the detection levers 7a and 7b are in the initial position where they are not rotated, the contact piece 23 of the first switch conducts the first conductive portion 26 and the long conductive portion 24. The second switch is turned off because the contact piece 23 is on the blank portion 28 and the long conductive portion 24. In addition, the detection lever 7a,
When 7b is in the slightly moved first moving position, the contact 23 of the first switch is off because the contact 23 is out of the first conductive portion 26, and the contact 23 of the second switch is the blank portion 28 and the long conductive portion. Over 24 and off. Further, when the detection levers 7a and 7b are in the second movement position which is rotated from the first position, the contact piece 23 of the first switch is off from the first conductive portion 26, and the contact piece 23 of the second switch is short. The conductive portion 25 and the long conductive portion 24 are conductive and turned on. When the detection levers 7a and 7b are at the maximum turning position, the contact 23 of the first switch conducts the second conductive portion 27 and the long conductive portion 24 to the on state, and the second switch contacts the contact 23. Turns on by conducting the short conductive portion 25 and the long conductive portion 24.

That is, the rotary switch issues the following ON / OFF signal according to the movement of the contactor 21 accompanying the rotation of the detection lever. Position of contactor First switch Second switch Initial position On Off First moving position Off Off Second moving position Off On Maximum moving position On On Thus, the first and second switches 30 and 31 are set to the position of the contactor 21. In response, four kinds of signals are emitted, and each signal is sent to the logic circuit 32. The logic circuit 32 calculates signals from the two switches 30 and 31 and transmits a signal indicating the position of the contact 21 to the operation control circuit 33. The logic circuit 32 of the present embodiment includes the contact 21
When is moved to the second movement position, the loading motor is activated via the control circuit 33.

The locking lever 8 has a first pin 8a fitted in the long groove 7d and a second pin 8b engaged with the outer circumference of the large-diameter disk.
And are formed. The locking lever 8 is provided with a second pin when the large-diameter disk 8b is conveyed from the insertion opening 3 to the reproduction position.
8b is pushed by the outer periphery of the disc 2b and rotated, and the first pin 8a is fitted into the long groove 7d to bring the contact piece 7c of the detection lever 7a to the maximum rotation position where it does not contact the outer periphery of the large-diameter disc 8b. It works to stop.

Further, the pressing piece 9c of the rod plate described in FIG.
When the stop levers 10a and 10b are engaged,
As shown in, the stopper portion 10c at the tip is located in the disc transport path. When the small-diameter disk 2a is conveyed onto the turntable 11, the stopper portion 10c abuts the outer circumference of the small-diameter disk 2a to match the rotation center of the small-diameter disk 2a with the rotation center of the turntable 11. Further, the rod plates 9a and 9b move forward to move the stop lever 10
When the engagement between a and 10b and the pressing piece 9c is released, the stop lever
10a and 10b elastically return to separate the stopper portion 10c from the disc transport passage.

Further, one rod plate 9b is engaged with a trigger 18 located on the inner side of the turntable 11 of the main body 1. When the disc 2 is fed into the main body 1 by the disc transporting means 6, the trigger 18 is pushed by the outer periphery of the disc 2 and rotates to bring the clamper 12 closer to the turntable 11. By engaging the trigger 18 with the rod plate 9b, the trigger 18
It is possible to set the contact position between the disk 2 and the disk 2 at a position corresponding to the outer diameter of the disk.

The operation of mounting the small diameter disk according to the present invention will be described with reference to FIGS. 6 to 17. In FIG. 6, a state in which the pair of detection levers 7a and 7b is in a position before the small-diameter disc 2a is inserted is shown by a solid line, and a state in which the small-diameter disc 2a is rotated is shown by a virtual line. When the small-diameter disk 2a is inserted, the rack plate 14 moves to the left in the figure by the width of the hook 16a against the force of the spring 15 with the rotation of the detection levers 7a and 7b.

At this time, the hook 16a is located between the locking piece 14b and the inclined cam 10a as shown in FIG. 8, and the sliding contact piece 16b of the detection plate 16 is the upper surface of the small-diameter disk 2a as shown in FIG. And the hook 16a is lifted above the receiving surface 14d. When the detection lever 7a is further rotated, the contactor
21 moves to the second movement position as shown in FIG. 9, and the logic circuit
Reference numeral 32 activates the loading motor via the control circuit 33.

With the insertion of the small-diameter disk 2a, the distance between the abutting pieces c of the pair of detection levers 7a and 7b becomes smaller than the small-diameter disk 2a.
Although it is pushed out by the outer periphery of the detection lever 7 when the maximum outer diameter portion of the disk 2a passes between both contact pieces 7c.
The a and 7b, the rack plate 14, and the rod plates 9a and 9b are moved back by the restoring force of the spring 15. On the other hand, the sliding contact piece 16b of the detection plate 16
Is still riding on the upper surface of the small diameter disc 2a,
The receiving surface 14c of the locking piece 14b enters the lower surface of the hook 16a, and the protrusion 14d abuts the side surface of the hook 16a. Therefore, the hook 16a prohibits the return movement of the rack plate 14 by half the width thereof, and the detection lever is rotated to hold the contact 21 at a position where the contact 21 is slightly rotated. At this time, in the rotary switch 20, as shown in FIG. 10, the contact 21 has returned from the second movement position to the first movement position, and the first and second switches 30 and 31 issue the off / off signals.

When the small-diameter disk 2a is conveyed to a position where its center coincides with the center of the turntable 11 as shown in FIG. 11, the clamper 12 is brought closer to the turntable 11 side via the trigger 18. Also, small diameter disc 2a
The outer periphery thereof comes into contact with the stopper portion 10c, and further conveyance is prohibited. After that, the feed roller 4 is lowered by a mechanism (not shown), and the small-diameter disk 2a is placed on the turntable 11 accordingly, and then the clamper 12 moves the small-diameter disk.
2a is clamped to the turntable 11. Then, as shown in FIG. 12, the small-diameter disc 2a is separated from the guide plate 5, the sliding contact piece 16b, and the feed roller 4, and the disc can be reproduced.

In the process of transporting the small-diameter disc 2a to the reproducing position as described above, the entire small-diameter disc 2a becomes the main body 1a
When the power is turned off when it is taken into the inside of the machine and the presence of the small-diameter desk 2a cannot be visually recognized from the outside, the rotary switch 20 remains at the position where both the first and second switches 30 and 31 issue an off signal. Has been. Then, when the power is turned on again, the logic circuit 32 receives the signal from the rotary switch 20 and receives the signals from the first and second switches 30 and 31.
Can be recognized that the small-diameter disk 2a has been taken into the main body 1a, since both are held at the first movement position where the off signal is issued.

Next, when the operation of taking out the small diameter disc 2a is performed, the feed roller 4 rises after the clamper 12 separates from the small diameter disc 2a. Then, the feed roller 4 is used to lift the small-diameter disc 2a from above the turntable 11 and guide plate 5
When the feed roller 4 rotates in this state, the small-diameter disc 2a is fed toward the insertion slot 3. When the maximum outer diameter portion of the small-diameter disk 2a passes through both abutting pieces 7c in the process of sending out the small-diameter disk 2a, the rotary switch 20
The contact 21 of moves to the second movement position.

Then, the maximum outer diameter portion passes through the abutment piece 7c, and the abutment piece 7c closes the insertion opening 3 so that the detection lever 7a,
When 7b rotates, the contact 21 of the rotary switch 20 moves to the first movement position and the first and second switches 30 and 31 emit an off / off signal. Then, the logic circuit 32 operates the control circuit 33 so as to stop the loading motor by the combination of this signal and the signal at the time of taking out operation. At this time, the detection levers 7a and 7b are in a slightly opened position, and the small-diameter disk 8a
Most of them are sent out of the main body. On the other hand, in the case of a large-diameter disk, about half is sent out of the main body as will be described later.

FIG. 13 shows a state in which the large diameter disc 2b is inserted into the insertion port 3 and the conveyance of the large diameter disc 2a is started. When the large-diameter disk 2a is inserted into the insertion slot 3 and the contact 21 of the rotary switch 20 reaches the second movement position, and the first and second switches 30 and 31 issue an off-on signal, the loading motor is activated. The large-diameter disk a is conveyed toward the reproduction position. Also, insert this large-diameter disc 2a into the insertion slot 3
The sliding contact piece 16b of the detection plate 16 is engaged with the upper surface of the large-diameter disk 2b in the process of being inserted into, and the hook 16a is pushed up from the guide plate 5.

Then, in the process of the large-diameter disk 2b being conveyed, the detection levers 7a, 7b are largely rotated by the contact piece 7c being pushed by the outer periphery of the large-diameter disk 2b. Then, the rack plate 14 also has the spring 15
It moves to the left greatly against the force of. This movement of the rack plate 14 causes the inclined cam 14a of the rack plate 14 to move to the hook 16a of the detection plate 16.
The lower surface of the hook 16a is engaged with the lower surface of the guide plate 5 and the hook 16a is held at a position pushed up from the guide plate 5 as shown in FIG.

After the maximum outer diameter portion of the large-diameter disk 2b passes between the contact pieces 7c, the second pin 8b of the locking lever 8
And the locking lever 8 is rotated against the force of a weak spring (not shown) to push the first pin 8a into the long groove 7d of the detection lever 7a. When the maximum outer diameter portion of the large-diameter disk 2b passes between the contact pieces 7c, the detection levers 7a and 7b rotate in the direction in which the contact piece 7c closes the insertion port 3. However, when the first pin a is pushed into the long groove 7d, the detection lever 7
The a is held in a position where it has been rotated greatly. Then, in the large diameter disc 2d, the maximum outer diameter portion passes the position of the second pin 8b,
As shown by 16, the outer circumference of the large-diameter disk 2b is conveyed to the reproduction position separated from the second pin 8b. Trigger during this transfer process
The large diameter disk 2b is clamped on the turntable 11 by the clamper 12 by the operation of 18 and the clamp mechanism.

On the other hand, the rotary switch 20 is a detection lever.
Since 7a is locked by the locking lever 8 in a position in which it has largely rotated, the contactor 21 reaches the maximum moving position as shown in FIG. 17, and the first switch 30 and the second switch 31 are both ON signals. Is emitting. Then, the logic circuit 32 detects that the large-diameter disk 2b is mounted inside the main body when both the first and second switches 30 and 31 emit the ON signal. That is, the relationship between the rotary switch 20 and the logic circuit 32 when the large-diameter disk 2b is conveyed to the reproducing position is as follows. Position of contact 21 First switch 30 Second switch 31 Judgment of logic circuit 32 Initial position On Off No disk Second moving position Off On Start loading motor Maximum moving position On On Large diameter disk is mounted

When the operation of taking out the large-diameter disc 2b during reproduction is performed, after the clamper 12 separates from the large-diameter disc 2b, the feed roller 4 holds the large-diameter disc 2b on the guide plate 5 from above the turntable 11. lift. Then, the rotation of the feed roller 4 causes the large-diameter disc 2b to be fed toward the insertion slot 3. In the process of sending out the large-diameter disk 2b, after the maximum outer diameter portion of the large-diameter disk 2b passes the contact piece 7c, the contact 21 of the rotary switch 20 moves to the second movement position.

Then, the contact 21 of the rotary switch 20 moves to the second movement position, and the first and second switches 30 and 31 emit a signal to turn on / off. The logic circuit 32 then activates the control circuit 33 to stop the loading motor. At this time, the detection levers 7a and 7b are in a position where the maximum outer diameter portion of the large-diameter disk 2b passes between the contact pieces 7c and is greatly opened.
About half of the large-diameter disk 2b is sent out of the main body.

As described above, in the description of this embodiment, when the small-diameter disk 2a is mounted on the main body 1a, the rack plate 14
The hook 16a of the detection plate 16 is engaged with the locking piece 14b to inhibit the rack plate 14 from returning to the initial position. Then, in response to the prohibition of the return of the rack plate 14, the two switches 30 and 31 of the rotary switch 20 emit an off / off signal, and the logic circuit 32 discriminates this signal and the small-diameter disk 2a is mounted. I am trying to emit the signal shown. Therefore, it is possible to know the mounting state of the large and small diameter discs by using the switch for controlling the loading motor. In particular, when the small-diameter disk 2a is in the conveyance path between the insertion opening and the turntable and which cannot be seen from the outside (the position shown by the broken line in FIG. 6).
Even when the power is turned off, when the power is turned on again, the two switches 30 and 31 emit an off / off signal, so that it can be indicated that the small diameter disk 2a is present in the device.

Further, in the present embodiment, this switch is used as a switch for starting the loading motor when the disc is inserted and a switch for stopping the loading motor when the disc is ejected, so that the switch can be omitted and the structure can be simplified.

[0034]

According to the disk detecting device of the present invention, a connecting member for rotating a pair of detecting levers, a disk conveying means, a locking means for the detecting lever, a detecting member, and a rotating position of the detecting lever are provided. And a switch that emits different signals. Then, an engaged portion that engages with the engaging portion of the detecting member is formed on the connecting member, and when the detection lever returns while the small-diameter disc is conveyed to the reproduction position, the engaging portion and the engaged portion are engaged. The return of the detection lever is prohibited by engaging with the part and the signal from the switch at this time is discriminated by the logic circuit to detect the presence or absence of the disc. As a result, the small diameter disc 2
Even if a is hidden in the conveyance path that cannot be seen from the outside as shown by the broken line in FIG. 6, when the power is turned on, the two switches 30 and 31 issue an off / off signal, so that the disk is inside the device. Can be displayed.

[Brief description of drawings]

FIG. 1 is an external view of a disc reproducing apparatus of the present invention.

FIG. 2 is a perspective view showing a relationship between a rack plate and a detection plate.

FIG. 3 is a side sectional view showing a state in which a small diameter disc is inserted into an insertion opening.

FIG. 4 is a perspective view showing a rotary switch.

FIG. 5 is a switch circuit diagram.

FIG. 6 is a plan view showing a state when a small-diameter disc is inserted into an insertion opening.

FIG. 7 is a side sectional view showing a state in which the small diameter disc is carried from the insertion port to the reproduction position.

FIG. 8 is a diagram showing a relationship between a rack plate and a detection plate when a small-diameter disc is inserted into an insertion port.

FIG. 9 is a switch circuit diagram when the conveyance of a small diameter disc is started.

FIG. 10 is a switch circuit diagram for detecting that a small-diameter disk is mounted.

FIG. 11 is a plan view showing a state where the small-diameter disc is carried to the reproduction position.

FIG. 12 is a side sectional view showing a state when the disc is being reproduced.

FIG. 13 is a plan view showing a state when a large-diameter disc is inserted into an insertion opening.

FIG. 14 is a diagram showing a relationship between a rack plate and a detection plate when a large-diameter disc is inserted into an insertion port.

FIG. 15 is a plan view showing a state where a large-diameter disc is carried to a reproducing position.

FIG. 16 is a switch circuit diagram for detecting that a large-diameter disk is mounted.

[Explanation of symbols]

1 device body 2 discs 3 Disc insertion slot 6 Disc transport means 7a, 7b Detection lever 8 Locking means 14b Engagement part 14 Connection member 15 Elastic member 16a engaging part 16 Detection member 20 Rotary switch 30,31 switch 32 logic circuits

Claims (3)

[Claims] 1. A pair of detection levers (7a, 7b), which are pushed forward by the discs (2a, 2b) inserted in the disc insertion opening (3) to move forward, and return by the elastic force of the elastic member (15). , A coupling member (14) which has an engaged portion (14b) and which opens and closes the pair of detection levers in synchronization with each other, and a disc transporting means for transporting the disc between the disc insertion opening and the reproducing position ( 6), a locking means (8) for locking both of the detection levers at a position apart from the large-diameter disc at the playback position, and a locking means (8) located in the disc transport path between the disc insertion opening and the playback position The small diameter disc is pushed up by the inserted disc to a position where it engages with the engaged portion of the connecting member.
When the detection lever (2a) is inserted and the detection lever returns from the open position to the closing direction, the detection member (16) that engages the engagement portion (16a) with the engaged portion and stops the detection lever during the return. )
And a pair of switches (30, 31) that output different combination signals depending on whether or not both detection levers are in the initial position, and whether or not a disc is inserted according to the output from both switches. A disk detection device comprising a logic circuit (32) for discriminating between. 2. The switch is a rotary switch (20) comprising a wiring board attached to one of the main body of the apparatus and a detection lever on one side and a contact attached to the other. The disk detection device described in 1. 3. A pair of switches output different combination signals depending on whether the detection levers are in an initial position, a large rotation position, or a small rotation position, and the logic circuit. 2. The disc detecting apparatus according to claim 1, wherein the disc detecting device discriminates whether a disc of a large size or a small disc is inserted or none of them is inserted according to the outputs from the both switches.