JP2615148B2 - Disc player - Google Patents

Description

The present invention relates to a disc reproducing apparatus for reproducing two or more types of discs such as a video disc having a diameter of 30 cm and a compact disc for audio having a diameter of 12 cm. And a disk loading device provided with a detection mechanism for detecting the disk size.

[Conventional technology]

As a disk size detection mechanism in this type of conventional disk loading device, the disk size detection mechanism operates immediately after the carry on which the disk is placed is transferred to the turntable, and the size of the disk to be reproduced is reduced. Which of two or more types was detected.

[Problems to be Solved by the Invention] However, the movement of the pickup for reproducing the signal of the disk to the disk reproduction start position is performed after the detection of the disk size, and the rotation speed of the disk is reduced to the required rotation speed. It takes a long time to reach, and therefore, it takes a long time to start reproduction.

In addition, since the detection element for detecting the disk size is generally fixed to the chassis, the distance between the disk and the detection element is long, so that not only a high-sensitivity element is required, but also light rays entering from the outside and There is also a drawback that a malfunction occurs due to the influence of external brightness or the like.

The present invention is to solve the above-mentioned disadvantages of the disk size detection mechanism in the conventional disk loading device, and by reducing the distance between the disk and the detection element, despite the fact that a low-sensitivity detection element is sufficient. Provided is a detection mechanism which is not affected by external light and is free from malfunction.

Also, by detecting the disk size during the loading of the disk and performing various operations necessary for disk reproduction before the disk clamp,
The purpose is to shorten the time until the start of reproduction.

[Means for solving the problem]

The present invention relates to a means of a disk loading device for achieving the above-mentioned object, in which a sensor is provided on a base member which conveys a carry capable of concentrically mounting disks of two or more sizes, and a carry driving means is provided. A disk of a size does not arrive above the sensor, and a disk of another size is one in which the detecting means detects the position where the carry is moved to the position where the disk arrives, and operates the sensor.

(Operation)

In the disc loading device of the present invention, the carry driving means operates, the large-diameter disc comes above the sensor of the base member from the position where the carry is projected from the player and the disc is placed, but the small-diameter disc is placed at that location. The detection means detects that the state has not come to the point where the state of the sensor is not reached, and operates the sensor.

Then, when a large-diameter disk is placed on the carry, the sensor is turned on by its reflection, but when the diameter is small, there is no reflection and the sensor remains off.

In this way, the disc size is determined based on ON / OFF of the sensor, and an operation corresponding to the disc size is issued to a mechanism such as a pickup that operates according to the disc size.

After this detection, the carry driving means continues its operation to complete the carry-in operation into the player.

Thereafter, the operation of the clamp operating means causes the disk to be transferred to the ten table and the disk to be clamped by the clamper, so that the disk can be reproduced.

(Example of the invention)

Next, a part of the embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a chassis, and a pair of left and right side plates 4 having two vertical guide holes 2 and two horizontal guide holes 3 formed on both right and left sides thereof are provided upright.

Pins 5 slidable up and down in the guide holes 2 are inserted into the two vertical guide holes 2 of the pair of left and right side plates 4 respectively. 6 is fixed to a slide frame 7 fixed to both left and right sides.

A pin 8 slidable in the guide hole 3 is inserted into each of the two horizontal guide holes 3 of the side plate 4. A pair of left and right slide plates 9 are fixed.

Therefore, the motor base 6 can slide up and down with respect to the side plate 4, and the slide plate 9 can slide back and forth.

The left and right slide frames 7 are respectively provided with two rollers 10 inward toward each other. The rollers 10 are concentric so that the video disk 11 and the compact disk 12 can be concentrically mounted thereon. The guide groove 13b of the carry 13 provided with a typical step portion 13a is inserted.

Therefore, the carry 13 can slide back and forth with respect to the motor base 6.

Further, a pin 5 is inserted into the vertical guide hole 2 of the side plate 4.
Another pin 14 is inserted slidably into each,
A clamp plate 15 is fixed to the inner end of the pin 14, so that the clamp plate 15 can slide up and down with respect to the chassis 1.

On the lower surfaces of the pair of left and right slide plates 9, projections 9 a are projected, and protrusions 9 a of the left and right slide plates 9 are inserted into grooves 16 a at both ends of a lever 16 pivotally supported on the center of the chassis 1.
Is inserted.

Therefore, when one slide plate 9 moves forward, the other slide plate 9 moves backward so that the pair of slide plates 9 operate symmetrically.

One slide plate 9 has horizontal portions 17a, 17
b, 17c are provided with cam holes 17 and horizontal portions 18a, 1 at both ends.
A cam hole 18 provided with 8b is formed as a pair of two cam holes.

Similar cam holes 17 and 18 are formed in the other slide plate 9 as two sets. However, since this slide plate 9 operates in the opposite direction to one slide plate, the cam holes 17 and 18 are formed. 1
8 is inclined in the opposite direction to the cam holes 17 and 18 of one slide plate 9.

The pin 5 of the slide frame 7 is inserted into the cam hole 18 after passing through the vertical guide hole 2, and the pin 14 of the clamp plate 15 is inserted into the cam hole 17 after passing through the vertical guide hole 2.

A guide hole 19 is formed in the slide frame 7 in the front-rear direction. The rack 2 is slidably mounted along the guide hole 19, and a slide plate is provided in a vertical groove 20 a of the rack 20. One of the pins 9 is inserted after passing through the horizontal guide hole 3.

Therefore, the slide plate 9 moves in the horizontal direction in conjunction with the movement of the rack body 20 in the horizontal direction.

On the other hand, a motor 21 is mounted on the lower surface of the motor base 6, and drives a gear 24 rotatably inserted on a shaft 23 on the lower surface of the motor base 6 from the motor 21 via a series of interlocking gears 22. It is supposed to.

The gear 24 is provided with a boss 24a.
, One gear 25 is rotatably inserted.

The gear 25 is provided with a hole 25a, and the ball 26 inserted into the hole 25a has a cam surface 2 having a step 24b of the gear 24.
It comes to ride on 4c.

And when this ball 26 rides on the cam surface 24c, the ball 26 projects above the upper surface of the gear 25, but when it rides on the low surface 24d formed by the step portion 24b, It is immersed in the upper surface of the gear 25.

The motor base 6 has a recess 6a for receiving the protruding ball 26.

On the lower surface of the gear 25, when the gear 24 rotates in the direction opposite to the arrow A in FIG.
A protruding portion 25b that rotates the interlock 25 is formed.

Further, a high gear portion 24e having a further higher tooth thickness is formed in a gear portion on the peripheral surface of the gear 24, and this high gear portion 24e can mesh with the rack 20b of the rack body 20.

On the upper surface of the gear 25, a cam surface 25d formed in the recess 25c is formed, and the cam surface 25d and the rack body are formed.
A roller 27 is interposed between the recess 20c and the recess 20c.

The roller 27 is supported by the cut-and-raised portion 6b of the motor base 6, and is movable only in a direction orthogonal to the rack body 20.

Therefore, when the cam surface 25 is in contact with the roller 27, a part of the roller 27 fits into the concave portion 26c of the rack body 20, and the rack body 2
The movement in the front-back direction of 0 is stopped.

However, when the recess 25c comes to the position of the roller 27, the roller 2
Since the gear 7 moves in the direction of the gear 25 and can escape from the concave portion 20c, the operation of the rack body 20 in the front-rear direction is allowed.

The gear 25 includes a gear 29 meshing with the rack 28 of the carry 13.
When the gear 25 rotates coaxially with the gear 29a, the carry 13 is driven in the front-rear direction.

As shown in FIG. 6, a rotating body 31 is rotatably mounted on the clamp plate 15 by a bearing 30. The rotating body 31 is moved downward while the clamper 33 is pressed down by a spring 32. Is slidably supported.

Further, the rotating body 31 is provided with a center 34 that is inserted into a center hole of the upper disc of the video disc 11 on which the two discs are bonded and performs centering of the upper disc, and a spring 35.
And slidably mounted in the up-down direction while being urged downward.

On the other hand, the video disc 11 and the compact disc 12 are sandwiched between the clamper 33 and a spindle for rotating the compact disc 12.
The turntable 37 attached to the 36 has a spring 39 which is inserted into the center hole of the disc on the lower surface side of the two video discs 11 and which performs centering thereof.
Slidably up and down while being urged upward by the

An encoder 40 for detecting the rotation angle of the gear 24 is attached to the lower surface of the gear 24. The encoder 40 generates a signal as shown in FIG. 30 according to the rotation angle of the gear 24.

28 and 29 based on the rotation angle of the gear 24, I is a disc replacement position, II is a position at which a sensor 41 described later detects the size of the disc, and III is a tray position. The waiting period, the stop position of the disk, and IV are positions where the loading operation is reversed when the pickup (not shown) reproduces the upper surface side and the lower surface side of the two bonded disks.

V is a position where the clamper 33 presses the video disk 11 to reproduce the lower surface side (hereinafter referred to as A-side clamp), and VI is a position where the clamper 33 presses the video disk 11 to reproduce the upper surface side of the video disk 11 ( (Hereinafter referred to as B-side clamp).

The above-mentioned sensor 41 is attached to the motor base 6, and FIG.
Shows the relationship with the disk size detection position.

Next, the operation of the disk loading device of this embodiment will be described.

Normally, the pins 5, 14 are at the stop positions III of the cam holes 18, 17 in FIG.

That is, since the pin 5 is located at a position slightly lowered from the cam hole 18, the motor base 6 and the carry 13 are connected to the vertical guide hole 2.
Is falling slightly.

In addition, since the pin 14 is slightly lowered in the cam hole 17, the clamp plate 15 is also slightly lowered in the guide hole 2.

At this time, the center of the circular step portion 13a is brought into the center of the clamper 33 by the engagement of the gear 29 and the rack 28,
Matches the center of the turntable.

Then, the rack body 20 is configured such that the rollers 27
Since the gear 24 is inserted into the concave portion 20c and removed from the concave portion 20c, and the high gear portion 24e of the gear 24 and the rack 20b are engaged with each other, the rack 24b can slide in the front-rear direction according to the rotation of the gear 24.

When the eject command is given at the stop position of III, the motor 21 rotates and a series of interlocking gears
The gear 24 is rotated via the gear 22 in the direction opposite to the arrow A in FIG.

Then, by the rotation of the gear 24, the high gear portion 24e drives the rack 20b of the rack body 20, moves the slide plate 9, and moves the pins 14,5 to the horizontal portions 17a, 18a of the cam holes 17,18. Let it.

Next, since the step portion 24b of the gear 24 passes under the ball 26, the ball 26 falls to the low surface 24d, the upper portion of the ball 26 comes out of the concave portion 6a of the motor base 6, and the gear 25 becomes rotatable.

At the same time, the other step 24b of the gear 24 is
In 5b, the gear 25 is rotated together with the gear 24.

Due to the rotation of the gear 25, the concave portion 25c of the cam surface 25d is separated from the position of the roller 27, and at this time, the concave portion 20c of the rack body 20 comes to the position of the roller 27, so that the roller 27 is pressed by the cam surface 25d and the rack body 20 Of the rack body 20
Prevent movement.

Therefore, the slide plate 9 is also stopped, and the clamp plate
15. The motor base 6 keeps the highest position.

The rotation of the gear 25 is transmitted from the gear 29a meshing with the gear 29a to the rack 28 by the gear 29, and the carry 13 at the ascending position is moved by the highest movement of the motor base 6, so that the carry 13 is a video disc 11, a compact The disk 12 is sent out to a disk exchange position I where the disk 12 can be placed.

Thus, when the carry 13 is sent out to the exchange position, the angle at that time is detected by the encoder 40 and the motor 21 is detected.
Is to be stopped.

In this way, when the carry 13 is at the disc change position of I, the video disc 11 is placed on the carry 13 or the compact disc 12 is placed on the step 13a, and a loading command is given or the carry 13 is pushed. As a result, the gear 24 rotates and the detection signal of the encoder 40 is switched (I in FIG. 30), and the motor 21 starts rotating in the direction opposite to that in the above-described ejecting operation.

The rotation of the motor 21 is transmitted to the gear 24, which rotates in the direction of arrow A in FIG.

At this time, the ball 26 is in contact with the step portion 24b and is about to be pushed up by the step portion 24b. However, since the motor base 6 is located on the ball 26, the pushing up is prevented.

Therefore, the button 26 is not pushed up from the hole 25a and maintains the engagement with the step 24b, whereby the gear 25 rotates together with the gear 24.

Since the gear 25a meshes with the gear 25, the rack 28 meshing with the gear 29 is driven, and the carry 13 moves in the direction of being drawn into the player.

Then, when the disk size reaches the discrimination position of II in FIG. 29, the encoder 40 detects the rotation angle of the gear 24 at that time as shown in FIG. 30, and operates the sensor 41.

When the video disc 11 is placed on the carry 13, the sensor 41 is turned on by reflection, but since the compact disc 12 does not come above the sensor 41, there is no reflection, and the sensor 41 is in the OFF state. It is.

When this sensor 41 is ON, as Figure 30, by operation of the switch SW _2, a pickup (not shown) is moved to the inside of the video disc 11.

Further, when the sensor 41 is OFF, similarly by operation of the switch SW _1, the pickup is moved to the inside of the compact disc 12.

As a result, it is possible to shorten the time until the disc is reproduced.

In this way, even after the disc size is determined, the motor 21 continues to rotate, and the drive of the gear 29 by the gear 25 continues the operation of the carry 13 so that the center of the disc mounted thereon and the clamper Retreat to the position where 33 centers coincide.

However, before reaching this position, the cam surface of gear 25
The concave portion 25c of 25d reaches the position of the roller 27.

At the same time, the high gear portion 24e of the gear 24 is
Since the rack body 20 meshes with 0b, the rack body 20 starts to move.

Therefore, the roller 27 fitted in the concave portion 20c is
From the cam surface 25d, and the rack body 20 starts operating by the meshing.

Then, as described above, the center of the disc and the clamper 33
Of the motor base 6 when the center of
Reach 6a.

Since the ball 26 is subjected to a pushing force by the step 24b, the ball 26 escapes from the step 24b and enters the recess 6a.

Accordingly, the interlock between the gear 24 and the gear 25 is released, and the rotation of the gear 25 is stopped by the ball 26 being fitted into the concave portion 6a, and the gear 25 is stopped.
24 continues to rotate further, and the rack body 2 is
Keep moving 0.

The slide plate 9 also moves in conjunction with the movement of the rack body 20, and the pins 14 fitted in the cam holes 17 and the pins 5 fitted in the cam holes 18 are lowered along the inclination.

Thus, when the slide plate 9 reaches the stop position of III in FIG. 28, the encoder 40 detects this by the rotation angle of the gear 24 and stops the motor 21 as shown in FIG.

At this time, the carry 13 also moves down due to the lowering of the pin 5, and the disc mounted on this carries the turntable 37.
The clamp plate 15 is in the position before it was transferred to
And the clamper 33 is not clamping the disk.

At the stop position of III, when a command for reproducing the lower surface of the disk (hereinafter referred to as A-side reproduction) is given, the motor 21 rotates in the same direction again.

Therefore, the rack body 20 moves in the same direction again, and the motor base 6 is lowered by the pins 5, so that the carry 13 is also lowered, and the disk placed thereon is transferred to the turntable 37.

Then, the clamp plate 15 is also lowered by the pin 14, and the clamper 33 presses the disk from the upper surface, and the center 38 is in the state of the A surface clamp inserted into the center hole of the disk on the lower surface side.

In this A-side clamp, the pin 14 is
And the encoder 40 detects the position of V at this time based on the rotation angle of the gear 24, as shown in FIG.
Stop rotation of 21.

Thereafter, the focus is turned on by a pickup (not shown), and the disc A surface is reproduced.

In the case of the video disc 11, two discs may be attached to each other.
Reproduction of the upper surface of the video disc 11 (hereinafter referred to as B-surface reproduction)
In this case, a B-side clamp is required to correct the eccentricity due to the misalignment of the two discs bonded together.

Therefore, at the end of the A-side reproduction or when a B-side reproduction instruction is given during the A-side reproduction, the motor 21 rotates in the reverse direction, so that the slide plate 9 moves in the opposite direction to the above, and
5, 14 reach the IV position from V.

Then, the encoder 40 detects this as shown in FIG. 30 and stops the motor 21.

During this stop period, the pickup reverses and moves to the upper surface side of the disk to prepare for B-side reproduction.

The position of the pins 5 and 14 depends on the disc
37, but the clamper 33 rises and the center 34
Is canceled.

When the reversal of the pickup is completed, the motor
21 rotates in the opposite direction to that described above, and the slide plate 9 also moves with this, so that the pin 14 reaches the position I of the horizontal portion 17b of the cam hole 17.

That is, since the height of the pin is lowered, the disc remains on the turntable 37, but even after the clamper 33 presses the disc against the turntable 37, the clamp plate
Reference numeral 15 indicates that the center 34 is further lowered, the center 34 pushes down the center 38, the center 34 is fitted into the center hole of the upper disk, and the B-side clamp for centering the upper disk is performed.

Then, the focus is turned on and the reproduction of the B side is performed.

Further, when the B-side reproduction command is given at the stop position of III, the motor 21 rotates in the same direction again.

Then, while performing the same operation as in the case of the above-described A-side reproduction, it passes through the position V and reaches the position VI, and the encoder 40
Detects this and stops the motor 21 as shown in FIG.

At the position of VI, the B-side clamping is performed as described above,
Surface reproduction is performed.

As described above, when an instruction to reproduce the A side is given during the reproduction of the B side or at the end of the reproduction of the B side, the motor 21 rotates in the reverse direction, and the reproduction is performed in the same manner as the reproduction from the A side to the B side. VI
Movement from the position to the IV position is performed.

The operation by the movement to the IV position is the same as described above, and the centering of the disk is released.

When the reversal of the pickup is completed, the motor 21
Is reversed again to move to the V position, and the A-side clamping and A-side regeneration as described above are performed.

Further, at the end of the A-side reproduction, the B-side reproduction, or by the reproduction stop command, the motor 21 rotates in the reverse direction, moves the slide plate 9 again in the reverse direction, and reaches the stop position of III.
The clamp of the disk is released by raising the clamper 33, the disk is transferred from the turntable 37 to the carry 13, and the motor 21 is also stopped.

Further, when the eject command is given at the stop position of III, the carry 13 carries out the disk to the disk exchange position of I as described above.

〔The invention's effect〕

As described above, according to the present invention, the size of the disc can be determined while the carry is being conveyed to the carry-in position in the player. Thereafter, while the operation of transferring the disk onto the turntable, the clamping operation by the clamper, and the like are performed, the waiting position of the pickup can be changed due to the difference in the disk size. Compared to the conventional disk size detection mechanism for detecting the time, it is possible to shorten the time until the start of reproduction.

Also, since the sensor for detecting the disk size is provided on the base member that carries the carry, the distance between the disk and the sensor is short, so that a low-sensitivity detection element can be used, and the unit price of the detection element can be reduced. it can.

Further, since the distance between the two is short, the sensitivity of the disk reflection increases, and the disk size can be accurately determined without being affected by disturbance or external light.

[Brief description of the drawings]

1 is an exploded perspective view of a main part, FIG. 2 is an exploded perspective view of a gear interlocking mechanism, FIG. 3 is a plan view, and FIG. 5 is a front view, FIG. 6 is a cross-sectional view of the center part of the turntable, and the left half is when the clamp plate is raised. FIG. 7 is a plan view of the gear interlocking mechanism at the position I, FIG. 8 is a cross-sectional view thereof, and FIG. 9 is a plan view of the gear interlocking mechanism when the rollers are switched. 10, FIG. 10 is a cross-sectional view thereof, FIG. 11 is a plan view of FIG. 7 when the carry is stored, FIG. 12 is a cross-sectional view thereof, FIG. 13 is a plan view of FIG. 14 is a sectional view thereof, FIG. 15 is a side view showing the clamp plate 15 corresponding to FIG. 7, FIG. 16 is a side view showing the carry 13 corresponding to FIG. 7, and FIG. 18 is a side view showing the clamp plate 15 at the time of clamping the A side, FIG. 18 is a side view showing the carry 13 corresponding to FIG. 17, and FIG. 19 is a side view showing the clamp plate 15 at the time of clamping the B side of FIG. Fig. 20, Fig. 20 is a side view showing the carry 13 corresponding to Fig. 19, Fig. 21 is a plan view of the motor base, Fig. 22 is its front view, Fig. 23 is a plan view of the rack body, Fig. 24 Is a plan view of the gear 24, FIG. 25 is a sectional view thereof, FIG. 26 is a plan view of the gear 25, FIG. 27 is a sectional view thereof, FIG. 28 is a side view showing a relationship between the cam hole and the pin, FIG. The figure is a plan view showing the movement of the carry, and FIG. 30 is a time chart showing the relationship between the encoder and FIGS. 28 and 29. 6 ... Motor base, 11 ... Video disc, 12 ... Compact disc, 13 ... Carry, 21 ... Motor, 24
… Gear, 29… gear, 33… clamper, 37… turntable, 40… encoder, 41… sensor.

Claims (1)

(57) [Claims] 1. A carrier on which discs of two or more sizes can be placed concentrically, and a carrier provided in a player and moved between a projecting position of the player projecting from the player and a carry-in position in the player. A disc player for reproducing a disc carried into a player, the disc player comprising a base member for supporting and a carry driving means for moving the carry between the two positions, wherein the base member is placed on the carry. A sensor for detecting the presence or absence of a disk is provided, and a disk of a certain size among the disks mounted during the movement of the carry does not arrive above the sensor, and a disk of another size arrives above the sensor. Detecting the presence or absence of a disk placed on the carry by operating the sensor at this time. Disc player to do.