JPH0377586B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a disk player having a clamp mechanism that moves a disk in a direction perpendicular to a turntable surface and clamps and fixes the disk onto the turntable. Regarding.

(b) Prior Art Recently, optical disc players that use optical pickups to reproduce signals recorded on discs have become popular. Since the disc player needs to rotate the disc at high speed during playback, it is equipped with a clamp mechanism that clamps and fixes the disc on the turntable. Such a disk player is described, for example, in Japanese Patent Laid-Open No. 139186/1986. In the disc player described in the above-mentioned publication, when the loading part, which is configured to be able to slide horizontally between an open position where the disc is attached/detached and a closed position where the disc is played, comes to the closed position. The disk mounting section on which the disk of the loading section is placed is vertically lowered, and the disk is crimped and fixed onto the turntable by a clamp mechanism. The disk crimped and fixed on the turntable in this way is rotated at high speed,
Played with optical pickup.

(C) Problems to be Solved by the Invention By the way, in the above-mentioned disc player, when taking out the disc from the disc playback state, usually the stop button is operated to stop the disc rotation, and then the loading section is opened. Since it is necessary to perform an opening operation, the operation is cumbersome. Therefore, if you directly open the loading section without operating the stop button, the turntable will stop rotating, the disk will be released from the turntable, and the clamp will raise the disk mounting section. However, if the turntable rotation is simply stopped and the clamp is released, the clamp may be released while the disc is rotating, which may cause damage to the disc. Ta.

(d) Means for solving the problems The present invention has been made in view of the above points, and includes a sliding member that is slid from the first position to the second position when the loading section is opened. a first switch that is switched when the sliding member reaches the first position; a second switch that is switched when the sliding member reaches the second position; and the first and second switches. Generates a control signal in response to the state,
When the first switch is switched during playback of a disc, the control signal for stopping the rotation of the turntable is switched, and when the second switch is switched, the compression of the disc onto the turntable is released. The present invention is characterized in that it includes a control signal generation circuit that generates a control signal for rotating the drive motor in the direction shown in FIG.

(e) Effect The present invention sets a time difference between the timings at which the first and second switches are switched so that the second switch is switched after the first switch is switched during the opening operation of the loading section.
The rotation of the turntable is stopped before the disc clamp release operation is performed.

(F) Embodiment FIG. 1 is a plan view showing the loading section in the closed position, FIG. 2 is a plan view showing the loading section in the open position, and FIG. 3 is a plan view showing the loading section in the closed position. 1 is a plan view showing a state between an open position and an open position, 1 is a loading section having a disk mounting section 1a on which a disk 13 is placed; 2 is an optical pickup; 3 is a drive motor serving as a drive source; 4 is a first gear fixed to the rotating shaft 3a of the drive motor 3; 5 is a second gear having a first tooth row 5a and second and third tooth rows 5b and 5c that engage with the first gear 4; Gear 6 is the second tooth row 5 of the second gear 5
A third gear 7 having a first tooth row 6a and a second tooth row 6b that engage with the third gear 6 is fixed to the loading portion 1, and a third gear 7 that has a first tooth row 6a and a second tooth row 6b that engage with the second tooth row 6b of the third gear 6. 8 is a sliding member that slides when the loading section 1 is opened; 9 is the third gear 6;
a rotary lever that rotates around a shaft 9c so as to be able to assume the first, second and third states depending on the rotational position of the lever;
A fourth gear 10 rotates around a rotation shaft 9d on the rotation lever 9 and has a first tooth row 10a and a second tooth row 10b that engage with the third tooth row 5c of the second gear 5. , 11 is a fifth gear that engages with the second tooth row 10b of the fourth gear 10, 12 is a second rack that is fixed to the optical pickup 2 and is engaged with the fifth gear 11, and 14 is the sliding gear. A first switch is controlled by the sliding movement of the member 8, and a second switch 15 is controlled according to the state of the rotary lever 9. As shown in FIG. 4, the third gear 6 has a first tooth row 6a on its outermost periphery that engages with a second tooth row 5b of the second gear 5.
However, a notch 6c is provided in a part of the first tooth row 6a. Further, the third gear 6
has a second row of teeth 6b that engages with the first rack 7, and a notch 6d is also provided in a part of the second row of teeth 6b. Further, the third gear 6 has a pin 6e and a groove 6f, and the third gear 6 has a pin 6e and a groove 6f.
When the end 9a of the pivot lever 9 is engaged with the pin 6e, the pivot lever 9 is in the first state, and when the protrusion 9b of the end 9a is fitted into the groove 6f, the pivot lever 9 is in the first state. 2 states, the second tooth row 5b of the second gear 5 and the third gear 6 other than the first and second states
When the rotary lever 9 is engaged with the first tooth row 6a of the rotary lever 9, the rotary lever 9 is in the third state. Furthermore, the third
The gear 6 is formed with a guide groove 6h having a cam portion 6g, so that the disk clamp plate 16 can be lowered by the cam portion 6g.

On the other hand, as shown in FIG. 5, the disk clamp plate 16 has a crimping part 18 for crimping the disk 13 to the turntable 17, and has protrusions 19a and 19b on both sides, respectively. A guide pin 20 is provided that projects from the straight line connecting the guide pin 19b. As shown in FIG. 6, the disk clamp plate 16 is rotatable about a straight line connecting the protrusions 19a and 19b, and the guide pin 20 is inserted into the guide groove 6h of the third gear 6. It has been inserted.

Further, as shown in FIG. 7, the sliding member 8 is configured to be slidable with respect to the chassis 22 by a spring 21 so as to have an elastic force, and is projected from the upper surface through a hole 22a of the chassis 22. protrusion 8a
and has a movable terminal 14 of the first switch 14 on the side.
It has a protruding piece 8b that comes into contact with a, and has a pressing part 8c that presses a protruding part 9e of the rotating lever 9 at its tip.

FIG. 8 shows the first and second switches 14 and 15.
23 is a first switch, 24 is a three-terminal second switch having a movable terminal 24a, first and second terminals 24b and 24c, and 25 is a circuit diagram showing a control system of the drive motor 3 in the switching operation. A control signal generation circuit generates control signals from the first to third output terminals 25a to 25c in accordance with the states of the first and second switches 23 and 24; 26 is the first and second output of the control signal generation circuit 25; a differential amplifier that generates a positive or negative voltage according to control signals output from terminals 25a and 25b; 27 a drive motor that rotates clockwise or counterclockwise according to the output voltage of the differential amplifier 26; 28 is a spindle motor that rotates the disk 29, and 30 is the third output terminal 25c of the control signal generation circuit 25.
This is a spindle motor stop circuit that stops the rotation of the spindle motor 28 according to a control signal output from the spindle motor 28. The first switch 23, second switch 24, and drive motor 27 are the first switch 14, second switch 15, and drive motor 3 shown in FIGS. 1 to 3, respectively.

The above-mentioned circuit is constructed as shown in the flowchart of FIG. That is, the control signal generation circuit 25 is composed of a microcomputer, and constantly judges the switching states of the first and second switches 23 and 24, and outputs the first to third output terminals 25a to 25c according to the judgment. It is configured to output a control signal from.

To explain the above-mentioned circuit using the flowchart of FIG. 9, first, the control signal generating circuit 25
It is determined whether the switch 23 is closed (step), and if the first switch 23 is closed, the control signal generation circuit 25 generates a control signal from the third output terminal 25c, and the spindle If the motor 28 is rotating, the spindle motor stop circuit 30 supplies current to the spindle motor 28 in the opposite direction to that during rotation, causing the spindle motor 28 to suddenly stop (steps and steps).
Then, the control signal generating circuit 25 determines whether or not the second terminal 24c, in which the movable terminal 24a of the second switch 24 is connected to the second terminal 24c, is in the closed state (step), and if YES, The control signal generating circuit 25 generates a positive voltage from the first output terminal 25a, generates a negative voltage at the output terminal of the differential amplifier 26, and rotates the drive motor 27 counterclockwise (step). In this case, it is determined whether a positive voltage is being generated from the second output terminal 25b of the control signal generating circuit 25 (step).
If YES in the step, the process proceeds to the step, where the positive voltage generated from the second output terminal 25b is stopped and a positive voltage is generated from the first output terminal 25a, and if NO, the control signal is In the generating circuit 25, the movable terminal 24a of the second switch 24 is connected to the first terminal 24b.
4b is in the closed state (step).
If NO in the step, the control signal generating circuit 25 generates a positive voltage from the second output terminal 25b, generates a positive voltage at the output terminal of the differential amplifier 26, and causes the drive motor 27 to move clockwise. Rotate (step). and after or at said step or
In the case of NO or in the case of YES in the step, the process proceeds to a step of determining whether or not the second terminal 24c of the second switch 24 is in the closed state. If YES in the step, the drive motor 27 is stopped (step); if NO, it is determined whether a positive voltage is generated from the second output terminal 25b of the control signal generation circuit 25 (step). . If NO in the step, it is determined whether a positive voltage is being generated from the first output terminal 25a of the control signal generating circuit 25 (step). If YES in the step, the first switch of the second switch 24
It is determined whether the terminal 24b is closed (step), and if NO, the process moves to a playback control sequence in which various control operations necessary to play the disc 29 are performed (step). In the above step
If YES, the drive motor 27 is stopped in step, and then the process moves to the step described above. Then, after the above-mentioned step or is performed, or if the answer is YES or NO, the process returns to the step again, and thereafter the above-described steps are repeated.

Now, as shown in FIG. 1, assuming that the loading section 1 is in the closed position, the disk clamp plate 16 is lowered, and the disk 13 is crimped onto the turntable 17 by the crimping section 18.
The protrusion 9b of the end 9a of the rotary lever 9 fits into the groove 6f of the third gear 6, and the rotary lever 9 is in the second state, and the third tooth row 5c of the second gear 5 and the fourth gear 10
The notch 6c of the first tooth row 6a of the third gear 6 is opposed to the second tooth row 5b of the second gear 5. Therefore, the rotation of the drive motor 3 is not transmitted to the third gear 6, but is transmitted to the fourth gear 10 via the first gear 4 and the second gear 5.
In addition, as shown in FIG. 6, the disk clamp plate 1
The guide pin 20 of No. 6 is connected to the guide groove 6 of the third gear 6.
Since the guide pin 20 is pushed in the direction of the arrow A by the cam part 6g, the crimp part 18 of the disk clamp plate 16 is pushed in the direction of the arrow B by the lever principle. The disc 13 is clamped onto the turntable 17 by the crimp portion 18 .

On the other hand, at this time, the first terminal 15b of the second switch 15 is in the closed state due to the second state of the rotary lever 9, and the pickup 2 is moved in accordance with the playback control sequence (steps in FIG. 9). in a state.

In the above-mentioned state, when a track number is specified and playback is started, the spindle motor 31 rotates, rotating the disk 13, and the drive motor 3 is energized, the pickup 2 is driven, and the disk 13 is energized. is played.

Stop the disc player that is in playback mode,
If you want to eject the disk, just open it. When the opening operation is performed, the sliding member 8
is pressed and slid in the direction of arrow C in FIG. When the sliding member 8 is slid in the direction of arrow C, first, the protrusion 8b of the sliding member 8 causes the first
Since the switch 14 is closed (the first position of the sliding member 8), the spindle motor is stopped (step), and in the subsequent sliding movement, the rotating lever 9 is pushed by the pressing portion 8c of the sliding member 8. The portion 9e is pressed (the second position of the sliding member 8). When the protrusion 9e is pressed, the rotary lever 9 is urged in the direction of arrow D, and the groove 6f of the third gear 6 is disengaged from the rotary lever 9, so that the rotary lever 9 is displaced from the second state to the third state, and the second switch 15 is also displaced from the closed state of the first terminal 15b to the neutral state in which the movable terminal 15a is not connected to both the first and second terminals 15b and 15c. , drive motor 3
rotates clockwise (step). at the same time,
Since the protrusion 8a of the sliding member 8 presses the rib 6i provided on the back surface of the third gear 6, the third gear 6
rotates slightly, and the first tooth row 6a of the third gear 6 and the second tooth row 5b of the second gear 5 engage with each other. For that reason,
The clockwise rotation of the drive motor 3 is transmitted to the third gear 6 via the first and second gears 4 and 5,
The third gear 6 rotates in the direction of arrow E. Said third
When the gear 6 rotates in the direction of arrow E, the guide pin 20 of the disk clamp plate 16 is gradually released from the pressure in the direction of arrow A by the cam portion 6g of the guide groove 6h, and accordingly moves in the opposite direction of arrow A. As a result, the crimping portion 18 of the disk clamp plate 16 is moved in the opposite direction of arrow B, and accordingly the disk 13 is raised and a clamp release operation is performed in which the disk 13 is moved away from the turntable 17. At this time, since the notch 6d of the second tooth row 6b of the third gear 6 faces the first rack 7, the loading portion 1 does not slide even if the third gear 6 rotates.

When the third gear 6 further rotates and the disk clamp plate 16 moves to a predetermined position, the second tooth row 6b of the third gear 6 and the first rack 7 engage with each other, as shown in FIG. become. Therefore, the loading portion 1 slides in the direction of arrow F in accordance with the rotation of the third gear 6. At this time, the rotation lever 9 is
Since b is in contact with the outer peripheral portion of the third gear 6, the third state is maintained.

When the third gear 6 rotates by a predetermined angle and the loading section 1 reaches the open position, as shown in FIG.
The pin 6e of the third gear 6 is engaged with the end 9a of the rotating lever 9. Therefore, the rotary lever 9 is displaced to the first state, and the movable terminal 15a of the second switch 15 is connected to the second terminal 15c, so that the rotation of the drive motor 3 is stopped (switched) and the disc player The eject operation is completed.

(G) Effects of the Invention As described above, according to the present invention, simply by performing the opening operation, the rotation of the spindle motor is first stopped, and then the clamp release operation is performed, so that a single operation is performed. It is possible to provide a disk player that can perform an eject operation without damaging the disk during operation.

[Brief explanation of drawings]

The figures show examples of the present invention.
Fig. 1 is a plan view showing the loading part in the closed position, Fig. 2 is a plan view showing the loading part in the open position, and Fig. 3 shows the loading part in the closed position and the open position. FIG. 4 is a plan view showing the third gear used in FIGS. 1 to 3, FIG. 5 is a perspective view showing the disk clamp plate, and FIG. 6 is a clamped state. Fig. 7 is a perspective view showing the main parts; Fig. 8 is a sectional view showing the main parts;
The figure is a circuit diagram showing the control system of the present invention, and FIG. 9 is its flowchart. Explanation of main drawing numbers, 1...Loading part, 3...
... Drive motor, 4... First gear, 5... Second gear, 6... Third gear, 8... Sliding member, 9... Rotating lever, 14... First switch, 15... Third gear 2
Switch, 16... Disc clamp plate, 17...
... Turntable, 25 ... Control signal generation circuit,
30...Spindle motor stop circuit.

Claims (1)

[Claims] 1. A disk player equipped with a clamp mechanism that moves a disk in a direction perpendicular to a turntable surface and presses and fixes the disk onto the turntable, including a drive motor that drives the clamp mechanism and a drive motor on which the disk is placed. a loading section that is movable between an open position for loading and unloading the disk and a closed position for regenerating the disk; via 2nd
a sliding member that is slid into a first position;
A first switch that is switched when the sliding member reaches the second position, a second switch that is switched when the sliding member reaches the second position, and a control signal is generated in response to the states of the first and second switches. When the first switch is switched during playback of a disc, a control signal is generated to stop the rotation of the turntable, and when the second switch is switched, the disc is pressed onto the turntable. and a control signal generating circuit that generates a control signal to rotate the drive motor in the direction in which the loading section is released, and when the loading section is opened, the disc is turned by the time difference between the first switch and the second switch. A disc player characterized in that the rotation of the turntable is stopped before the pressure on the table is released.