JPH0454600Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk mounting device, and more particularly to a tray type disk mounting device.

Many disc playback devices use a tray-type disk mounting device, in which a tray is provided that can be moved in and out of the main body of the disk playback device, the disk is placed on the tray, and the disk is pulled into the main body of the device along with the tray to be installed. has been done.

In this disk mounting device, if the disk is misaligned from a predetermined position on the tray, the disk may not be mounted properly and the disk may be damaged.

Therefore, it is necessary to correctly place the disk at a predetermined location on the tray.

BACKGROUND ART Conventionally, a portion of a tray on which a disk is placed is formed into a concave shape, so that the disk can be easily placed correctly on a predetermined portion.

Problems to be Solved by the Invention However, there is a possibility that the disk may be placed slightly off from the position where it should be placed. In this case as well, there is a problem in that the disk mounting operation progresses, and in some cases, the disk mounting may not be successful and the disk may be damaged.

An object of the present invention is to provide a disk mounting device that solves the above problems.

Means for Solving the Problems The present invention provides a disk player in which a tray, which is located at a position protruding outward from the main body of the disc playback device and on which a disk is placed, is pulled into the main body of the disk playback device by a motor, and the disc is mounted on the tray. In the mounting device, a first detection device optically detects the leading outer peripheral edge of the disk in the drawing direction and the center hole of the disk during the drawing process, and a first detection device that optically detects the disk when the disk is correctly placed. and a second detection device that optically detects the detected portion provided on the tray in a positional relationship corresponding to the outer peripheral edge and the center hole. The device is installed in a positional relationship such that the devices detect each at the same time, and based on the information regarding the detection operation time of each of the detection devices, it is possible to detect a disk placement error at both the outer peripheral edge and the center hole of the disk. The disc mounting device is configured to include: a disk placement error detection circuit that detects a disk placement error; and a motor control circuit that reverses the motor in response to a disk placement error detection signal from the detection circuit.

Function The system is configured to detect not only the outer periphery of the disk but also the center hole of the disk to detect errors in placing the disk, so not only normal disk placement errors but also errors in the outer periphery of the disk can be detected. It is also possible to detect special types of placement errors, such as the center hole being out of alignment with the outer peripheral edge of the disk when it is placed, resulting in high reliability.

Embodiment FIG. 1 shows a disk mounting device which is an embodiment of the present invention.

2 and 3 are a perspective view and a plan view of the disk mounting device.

In each figure, reference numeral 1 denotes a compact disc playback device, which is capable of playing both a standard compact disc 2 with a diameter of 12 cm and a small compact disc 3 with a diameter of 8 cm. The diameter of the center hole is for each disk 2,
All three are equal.

4 is the main body of the compact disc playback device, and 5 is a tray.

The tray 5 is movable in the directions of arrows _X1 and _X2 ,
It is possible to enter and exit the disc playback device main body 4.

The tray 5 has a standard disk placement part 6 on which the standard disk 2 is placed, and a small disk placement area 7 on which the small disk 3 is placed, which have different depths and are arranged in a shallow dish shape and concentrically. It is formed into a shape. O is the center.

When the standard disk 2 or the small disk 3 is placed on the tray 5 protruding forward from the front panel 13 of the playback device main body 4 and a predetermined operation is performed, the tray drive motor 8 is started and the pulley 9 is rotated.
A wire 11 that is stretched between pulleys 9 and 10 and fixed to the tray 5 at both ends runs, and the tray 4 is guided by a guide rod 12 and moves in the direction of arrow _X1 , and is pulled into the playback device main body 4. and the disc is mounted on a turntable (not shown).

Reference numeral 20 denotes a first optical detection device, which includes an infrared light emitting diode 21 and a phototransistor 22, which are arranged vertically facing each other with a tray 5 in between. This is provided at a position P ₁ in a portion of the playback device main body 4 immediately inside the tray opening 23 and opposite to the center line 24 in the moving direction of the tray 5 .

As will be described later, this first optical detection device 20 firstly detects a portion of the outer periphery of the disks 2 and 3 placed on the tray 5 on the side of the playback device main body 4, that is, in the upper direction in the drawing direction. First part 2a, 3a
, and secondly, the center holes of the disks 2 and 3 are detected.

Note that in order to prevent the detection device 20 from making false detections, a portion of the tray 5 corresponding to the center line 24 is formed as an elongated opening 25.

30 is a second optical detection device, which includes a light emitting diode 31 and a phototransistor 32 (both connected to the fifth
The phototransistor 33 is installed at a predetermined position _P2 inside the main body 4 of the playback device.

This detection device 20 is fixed to the inner part of the side surface of the tray 5 and detects a slit member 34 as a detected portion that moves the tray 5 together.

As shown in FIG. 4, the slit member 34 has walls 35, 36, 37, 38 and an opening 3 between
It has a shape consisting of 9, 40, 41, and 42.

Here, as shown by the two-dot chain line in FIG. 4, the cross section along the center line 24 when the disks 2 and 3 are properly placed on the tray 5 corresponds to the part on the side of the playback device main body 4 from the center. Let me think about it. The wall portion 35 is a portion facing the outer peripheral edge portion 2a of the standard disk 2,
The wall portion 36 is a portion facing the outer peripheral edge 3a of the small disk 3, the wall portion 37 is a portion facing the inner peripheral edge portions 2b, 3b of each disk 2, 3, and the wall portion 38 is a portion facing the center hole of each disk 2, 3. It is arranged at a part opposite to 2c and 3c. That is, the shape and dimensions of the slit member 34 are determined so that the positional relationship is the same as the positional relationship between the outer peripheral edge, inner peripheral edge, and center hole of the disks 2 and 3 when properly placed on the tray 5.

The second optical detection device 30 detects when the outer peripheral edge 3a of the disc 2 placed on the tray 5 on the player main body 4 side reaches a position where it is detected by the first optical detection means 20. It is provided at a position where the leading wall portion 35 of the slit member 34 is detected.

That is, the first and second optical detection devices 20, 30
When the standard disk 2 is placed correctly, the outer peripheral edge 2a and the wall 35 are detected almost simultaneously, and when the small disk 3 is placed correctly, the outer peripheral edge 2a and the wall 35 are detected at the same time. 3a and the wall portion 36 are arranged in such a positional relationship that they are detected substantially simultaneously.

Reference numeral 50 denotes a disk placement error detection circuit, which specifically has the configuration shown in FIG. This detection circuit 5
0 detects an error in disk placement (setting) during the tray pull-in operation based on the detection operations of the first and second detection devices 20 and 30. The configuration and operation of this detection circuit 50 will be described later.

A motor control circuit 51 outputs a motor reversal signal when a disk placement error detection signal is applied from the circuit 50 during the retracting operation of the tray 5.

This signal is applied to motor drive circuit 52 in FIG. 5, causing motor 8 to rotate in reverse.

As a result, the tray 5 is pushed back from the middle in the direction of arrow _X2 , and damage to the disks 2 and 3 is prevented.

When the disks 2 and 3 are placed correctly, the detection signal is not output, the tray 5 is pulled in to the final position, and the disks 2 and 3 are correctly placed.

Next, the detection circuit 50 will be explained.

60 is a D-flip-flop which processes the positional information of the outer edge of the standard disk 2.

61 is a D-flip-flop which outputs a placement error detection signal.

62 is a binary counter, and each disk 2, 3
Outputs the position information of the center hole.

The AND gates 63, 64, and 70 cooperate with the FF 60 and the like to detect a disk placement error based on the position information of the outer peripheral edge of the disk.

AND gates 65 and 70 are binary counters 62
etc., to detect disk placement errors based on the position information of the disk center hole.

The switch _SW1 is in the state shown in FIG. 5, and the light emitting diodes 21 and 31 are emitting light.

First, the detection signal from the second optical detection device 30, which serves as a reference, will be explained.

When the motor 8 rotates normally and the tray 5 is drawn in the direction of arrow _X1 , the slit member 34 passes through the photo interrupter 33, and the walls 35, 36, etc. are shielded from light.

As a result, the voltage at the part in FIG. 5 becomes L level when light is blocked and becomes H level when light is not blocked.
Changes as shown in the figure. In the figure, the sections .about. in FIG. 4 are shown in correspondence with each other.

This voltage is applied to the clock terminal of the binary counter 62 via the hysteresis inverter 66, and the outputs of the terminals Q ₁ , Q ₂ , Q ₃ are as shown in FIG.
It will look like this.

The counter value is 0 in section, the counter value is 1 in section, the counter value is 2 in section, the counter value is 3 in section, and the counter value is 4 in section.

As a result, the output of the AND gate 70 connected to the terminals Q ₁ and Q ₂ becomes as shown in FIG.
It becomes H in this section, and L in other sections.

Also, the above voltage is applied to FF via inverter 67.
60 and one input gate of AND gate 63.

Note that the circled numbers in FIG. 5 indicate the parts in the circuit, and the circled numbers in FIG. 6 indicate the voltage waveforms of the parts indicated by the corresponding numbers in FIG.

Next, as shown in FIG. 8A, the standard disk 2
The operation when the tray 5 is correctly placed and the outer peripheral edge 2a is aligned with the position S on the tray 5 will be described.

The first detection device 20 detects each position of the standard disk 2, and the voltage at the portion in FIG. 5 changes as shown in FIG. 6.

First, when the outer peripheral edge part 2a enters between the light emitting diode 21 and the phototransistor 22, the light is blocked by the standard disk 2 itself, and the voltage at that part becomes H.
level, and when the center hole 2c faces each other, the light shielding is released and the voltage becomes L level.

This voltage is applied to the clock terminal of the FF 60 via the hysteresis inverter 68 and the inverter 69, and at time _t1 , the output of the Q terminal attempts to reach the H level.

However, since time t ₁ is within the above interval, Q
The output of the terminal does not become H but remains L.

Therefore, the output of the AND gate 63 becomes L, the output of the AND gate 64 also becomes L, and the output of the Q terminal of the FF 61 maintains L.

Motor 8 continues to rotate normally, and tray 5 moves in the direction of arrow X ₁
direction, and the disc 2 is drawn into the playback device main body 4.

The center hole 2c of the disk 2 is the first inspection device 20
When facing the center hole 2c, the voltage at that part becomes L, and when the center hole 2c passes through, the voltage becomes H.

Since the section of voltage L includes the above section, the output of AND gate 70, that is, one input of AND gate 64 is at H level, but the other input of AND gate 64 is at L level,
The output of the AND gate 64 is set to L level. Therefore, the output of the Q terminal of the FF61 remains at L.

As a result, the motor 8 continues to rotate normally, and the tray 5
moves in the direction of arrow _X1 to the final position, and standard disk 2 is mounted.

In this way, the disk is mounted after confirming the placement position of both the outer peripheral edge of the disk and the center hole.

Next, an explanation will be given of the operation when a placement error as shown in FIG. 7B occurs.

In this case, the outer peripheral edge 2a is detected later than usual, and the voltage in the middle part of FIG.
It changes as shown in 6a. The time point t ₂ (S ₁ ) when the voltage reaches the H level is outside the interval and within the interval. Therefore, FF60 is not cleared and the output of this Q terminal becomes H.

As a result, the output of the AND gate 63 becomes H as shown in FIG.

At this time, the output of the AND gate 70 is L. The output side of the AND gate 70 is an inverter 71
is connected to one input terminal of the AND gate 64 through the input terminal 64 of the AND gate 64.
The voltage of a is H.

When the output of the AND gate 63 becomes H, both inputs of the AND gate 64 become H, and its output becomes H as shown in FIG.

This is added to the clock terminal of FF61,
The output of this Q terminal is H as shown in Figure 6.
becomes. As described above, an error in placing the disk 2 is detected.

This is outputted from circuit 50 as an error signal and applied to circuit 51 to reverse the motor.

As a result, the tray 5 that has been pulled in halfway is pushed back to its original position in the direction of arrow _X2 . When the tray 5 is pushed back to its original position, the reset switch SW ₂ provided on the back side of the front panel 13 is pushed by the operator 80 provided on the tray 5 and turned on, as shown in FIG. 3, and the FF 61 is turned on. cleared. The operator only has to correct the placement error of the disk 2 and perform the mounting operation again.

If the mounting position of the standard disk 2 is shifted in the opposite direction from the above case, as in the above case,
In the circuit 50, the first detection device 20 is connected to the outer peripheral edge 2a.
A placement error is detected at the moment when this is detected.

Next, as shown in FIG. 8C, the small disk 3
The operation when the tray 5 is placed normally and the outer peripheral edge 3a coincides with the position T on the tray 5 will be described.

The first detection device 20 detects each position of the small disk 3, and the voltage of the part in FIG.
It changes as shown in 6b.

First, when the outer peripheral edge 3a enters between the light emitting diode 21 and the phototransistor 22, the light is blocked by the small disk 3 itself, and the voltage at that part becomes H.
level, and when the center hole 3c faces each other, the light shielding is released and the voltage becomes L level.

This voltage is applied to the clock terminal of the FF 60 via a hysteresis inverter 68 and an inverter 69, and at time _t3 , the output of the Q terminal attempts to reach the H level.

However, since time t ₃ is within the above interval, Q
The output of the terminal does not become H but remains L.

Therefore, the output of the AND gate 63 becomes L, the output of the AND gate 64 also becomes L, and the output of the Q terminal of the FF 61 maintains L.

Motor 8 continues to rotate normally, and tray 5 moves in the direction of arrow X ₁
direction, and the disc 2 is drawn into the playback device main body 4.

The center hole 3c of the disk 3 is the first inspection device 20
When facing, the voltage of the part becomes L, and when the center hole 3c passes, it becomes H.

Since the section of the voltage L includes the above section, the output of the Q terminal of the FF 61 remains at L.

As a result, the motor 8 continues to rotate normally, and the tray 5
moves in the direction of arrow _X1 to the final position, and the small disk 3 is mounted.

In this way, the small disk 3 is also mounted after confirming the placement position of both the outer peripheral edge and the center hole.

Next, an explanation will be given of the operation when a placement error as shown in FIG. 8D occurs.

In this case, the outer peripheral edge 3a is detected earlier than usual, and the voltage in the middle part of FIG.
It changes as shown in 6c. The time point t ₄ T ₁ when the voltage reaches the H level is outside the interval d and within the interval. For this reason, FF60 is not cleared and this Q
The output of the terminal becomes H.

As a result, the output of the AND gate 63 becomes H as indicated by 7a in FIG.

At this time, similarly to the above, the output of the AND gate 70 is L, and the input terminal 6 of the AND gate 64
The voltage of 4a is H.

When the output of the AND gate 63 becomes H, both inputs of the AND gate 64 become H, and its output becomes H as shown at 8a in FIG.

This is added to the clock terminal of FF61,
The output of this Q terminal becomes H as shown at 9a in FIG. As described above, an error in placing the disk 3 is detected.

This is output as an error signal from the circuit 50 and applied to the circuit 51, and the motor 8 is reversed.

As a result, the tray 5 that has been pulled in halfway is pushed back to its original position in the direction of arrow _X2 , the reset switch _SW2 is turned on, and the FF61 is cleared.

The operator only has to correct the placement error of the disk 3 and perform the mounting operation again.

If the mounting position of the standard disk 2 is shifted in the opposite direction from the above case, as in the above case,
In the circuit 50, the first detection device 20 is connected to the outer peripheral edge 3a.
A placement error is detected when this is detected.

As described above, the detection circuit 50 detects a placement error when the outer peripheral edge of the disk is detected in the section , , regardless of the type of disk to be placed.

Next, as a special case, as shown in FIG. 8E, the case where the outer periphery 2a of the standard disk 2 is aligned with the position T of the outer periphery 3a of the small disk 3 when it is correctly placed. explain.

When the standard disk 2 is drawn in together with the tray 5, the voltage in the middle portion of FIG. 5 changes as shown at 6d in FIG.

Time point _t1 should originally be within section b, but since it is within the section where the clear signal is supplied to FF60, the output of the Q terminal does not become H but remains L, and the output of FF61 The output of the Q terminal 4 also maintains L, and although it is originally a placement error, the detection circuit 50 does not detect the placement error at the time of outer edge detection.

Tray 5 is further drawn in.

Since the position of the center hole 2c is shifted from the position where the center hole should originally be, the voltage of the portion is still at H level at the boundary between the two sections.

In the interval, the output of the AND gate 70, that is, one input of the AND gate 65 becomes H. Therefore, when moving from the section to the AND gate 6
The output of No. 5 becomes H as shown in FIG.

This is added to the clock terminal of FF61,
The output of this Q terminal becomes H as shown by 9ab in FIG.

Therefore, when the center hole 2c is detected, the disk 2
A placement error is detected, and the tray 5 is pushed back.

Contrary to the above, a case will be explained in which, as shown in FIG. 8F, the outer peripheral edge 3a of the small disk 3 is aligned with the position S of the outer peripheral edge 2a of the standard disk 2 when placed normally. do.

When the disk 3 is drawn in together with the tray 5, the voltage in the middle part of FIG. 5 changes as shown at 6e in FIG.

Time point _t1 should originally be within the interval, but since it is within the interval where the clear signal is supplied to FF60, the output of the Q terminal is not H but remains L, and the output of FF61 is Q terminal output is also L
Even though it is originally a placement error, the detection circuit 50 does not detect the placement error at the time of detecting the outer peripheral edge.

Tray 5 is further drawn in.

Since the position of the center hole 3c is shifted from the position where the center hole should originally be, the voltage of the part is still at H level at the boundary between the two sections.

In this interval, the output of the AND gate 70, that is, one input of the AND gate 65 becomes H. Therefore, at the point when the interval shifts to empty, the output of the AND gate 65 becomes H as shown at 10a in FIG.

This is added to the clock terminal of FF61,
The output of this Q terminal becomes H as shown at 9c in Figure 7.
becomes.

Therefore, when the center hole 3c is detected, the disk 3
A placement error is detected, and the tray 5 is pushed back.

Moreover, as a mounting error, as shown in FIGS. 8G and 8H, the position of the outer peripheral edge may be shifted laterally from the correct position.

In this case, the voltage in the middle part of FIG. 5 changes as shown at 6f and 6g in FIG. center hole 2
Since c and 3c are shifted from point 0, the light shielding is not canceled and the voltage remains at H.

Therefore, the output of the AND gate 65 becomes H as indicated by 10b in FIG. 7 at the point when the section shifts to empty.

This is added to the clock terminal of FF61,
The output of this Q terminal becomes H as shown at 9d in FIG.

Therefore, a misplacement of the disk 2 is detected at the time when the center holes 2c, 3c should be detected, and the tray 5 is pushed back.

Effects of the Device As explained above, according to the present invention, disc placement errors are detected not only at the outer edge of the disk but also at the center hole of the disk. Although the outer periphery of the disk is aligned with the outer periphery of the disk when it is correctly placed, it is also possible to detect special placement errors such as the center hole being misaligned. It is reliable and can reliably prevent accidents in which the disk is damaged due to the tray being pulled in due to incorrect placement. It also has the advantage of being effective when applied to an apparatus that reproduces two types of disks with different diameters.

[Brief explanation of drawings]

1 is a block diagram of an embodiment of the disk mounting device of the present invention, FIG. 2 is a perspective view of the disk mounting device of FIG. 1, FIG. 3 is a plan view of the disk mounting device of FIG. 1, and FIG. The figure shows the slit member in correspondence with the disk, FIG. 5 is a circuit diagram of the disk placement error detection circuit, FIGS. 6 and 7 are diagrams showing voltage waveforms at various parts in FIG. 5, and FIG. Figures A and B are diagrams showing normal disk placement states, and Figures 8C to 8H are diagrams showing various aspects of disk placement errors. DESCRIPTION OF SYMBOLS 1...Compact disc playback device, 2...Standard compact disc, 3...Small compact disc, 2a, 3a...Outer periphery, 2b, 3b...
...Inner peripheral edge, 2c, 3c...Center hole, 4...Compact disc playback device body, 5...Tray, 6
...Standard disk rest, 7... Small disk rest, 8... Tray drive motor, 20... First optical detection device, 21... Infrared light emitting diode,
23...Phototransistor, 24...Center line,
30... second optical detection device, 31... light emitting diode, 32... phototransistor, 33...
...Photo interrupter, 34...Slit member (detected part), 35-38...Wall part, 39-42...
...opening, 50...disk placement error detection circuit,
51...Motor control circuit, 52...Motor drive circuit, 60, 61...D-flip-flop, 62
... Binary counter, 63-65, 70 ... AND gate, 66, 68 ... Hysteresis inverter, 67, 69, 71 ... Inverter.

Claims (1)

[Scope of Claim for Utility Model Registration] A disc mounting device for mounting the disc by drawing a tray on which a disc is placed, which is located at a position protruding outward from the main body of the disc playback device, into the main body of the disc playback device by a motor, a first detection device that optically detects the leading outer peripheral edge of the disk in the retracting direction and the center hole of the disk during the retracting process; and the outer peripheral edge of the disk when the disk is correctly placed. and a second detection device that optically detects the detected portion provided on the tray in a positional relationship corresponding to the center hole, and when the disk is placed correctly, both detection devices are substantially in contact with each other. A disk which is arranged in a positional relationship such that each detection device detects each at the same time, and which detects a disk placement error with respect to both the outer peripheral edge and the center hole of the disk, based on information regarding the detection operation time of each of the detection devices. A disk mounting device comprising: a placement error detection circuit; and a motor control circuit that reverses the motor in response to a placement error detection signal from the detection circuit.