JP2002208135A - Disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk player capable of surely initializing an optical pickup by controlling the operation of the optical pickup for a request for opening a lid. SOLUTION: The disk player 100 is provided with a main body 1 for loading a disk, a LID (lid) 2 rotatably supported on the main body 1, a pressing means for pressing the LID 2 in an open state by a spring 4, and a locking means for holding the lid in a closed state by engagement between a cam lock part 5 and a LID lock part 6. When requested to open the LID 2 during disk player, after disk servo stop processing, an optical pickup 9 is returned to a specified initial position (innermost peripheral side), and then the engagement between the cam lock 5 and the LID lock part 6 is released to open the LID 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus for reproducing a disk such as a compact disk (CD), and more particularly, to a disk reproducing apparatus having a cam lock type lid control function.

[0002]

2. Description of the Related Art Conventionally, a disc player such as a CD has an optical pickup, and when a reciprocating sled is located at the innermost circumference of the player, it is called a start limit switch provided at the innermost circumference. It has been confirmed that the optical pickup is initialized by pressing the button of the switch by the thread.

[0003]

However, in the conventional disk player, when a user requests to open the lid during reproduction of the disk or the like, the mechanism immediately shifts the lid to the open state after performing a servo stop process. The lid sometimes opened with the sled and the start limit separated. In particular, in a disk player of a type in which a lid is rotatably supported on a main body on which a disk is mounted, it is often arranged at a position where a sled can be directly touched. For this reason, if the lid is opened with the sled separated from the start limit switch, if foreign matter such as large dust enters the space between the sled and the start limit switch, the optical pickup cannot be initialized thereafter. However, there is a problem that the function of detecting the initialization of the optical pickup by the start limit switch does not operate normally.

[0004] It is an object of the present invention to provide a disk reproducing apparatus capable of reliably initializing an optical pickup by controlling the operation of the optical pickup when a lid opening request is made.

[0005]

The present invention has the following features in order to achieve the above object. In the following description of the means and the like, a configuration corresponding to the embodiment is exemplified by parentheses. Reference numerals and the like are reference numerals of the attached drawings.

According to the first aspect of the present invention, there is provided a main body for mounting a disk (for example, main body 1 in FIG. 1B) and a lid rotatably supported by the main body (for example, FIG. 1B). LID of
2) and urging means for urging the lid to an open state (for example,
1 (a) and locking means (for example, the cam lock 5 and the LID lock portion shown in FIGS. 1 (a) and 1 (b)) for locking the lid in a closed state regardless of the biasing by the biasing means. 6), command means (for example, the key input unit 16 and the CPU 14 in FIG. 4) for outputting an open command to release the lock and shift the closed lid to the open state to the lock means,
A disc player (e.g., the disc player 100 of FIG. 1) having a command to stop driving of a motor performing a disc reproducing operation when an open command is issued by the command means during disc reproduction. Operation control means (for example, CPU 14 in FIG. 4) for moving the optical pickup to a predetermined position in the radial direction of the disk, wherein the lock means includes a motor for which the operation control means performs a disk reproducing operation. When the drive is stopped and the optical pickup is moved to a predetermined position, the lock is released and the lid in the closed state is shifted to the open state.

According to the first aspect of the present invention, when an open command is issued by the command means during reproduction of a disc,
Operation control means for stopping the drive of the motor performing the reproduction operation of the disk and moving the optical pickup to a predetermined position in the radial direction of the disk, wherein the lock means controls the operation of the disk to perform the reproduction operation of the disk. When the drive of the motor being performed is stopped and the optical pickup is moved to a predetermined position, the optical pickup is moved to a predetermined position by releasing the lock and shifting the lid in the closed state to the open state. After that, by moving the lid to the open state, it is possible to speed up the reproduction operation of the disc after the lid is moved to the closed state.

According to a second aspect of the present invention, in the first aspect of the present invention, the lock means includes a first lock member (for example, an LID lock portion 6 in FIG. 1B) provided on the lid. A second lock member (e.g., the cam 5 shown in FIG.
3).

According to the second aspect of the present invention, the lock means engages the first lock member provided on the lid with the second lock member provided on the main body, thereby providing a component. The number of points is small, and the manufacturing cost can be reduced.

According to a third aspect of the present invention, in the first or the second aspect of the present invention, detecting means for detecting whether or not the optical pickup is at a predetermined position (for example, the SLT shown in FIG. 2)
When the optical pickup is detected to be at a predetermined position by the detection means, the engagement between the first lock member and the second lock member by the lock means is released. Opening means (for example, FIG. 4) for outputting a release signal to an electric key (for example, the electromagnetic plunger 51 of FIG. 3A) having a second lock member at the distal end.
CPU 14).

According to the third aspect of the present invention, a detecting means for detecting whether or not the optical pickup is at a predetermined position; and when the detecting means detects that the optical pickup is at a predetermined position, Opening means for outputting a release signal for releasing the engagement between the first lock member and the second lock member by the lock means to an electric key having a second lock member at a distal end portion. By releasing the lock of the lid after the optical pickup is moved to the predetermined position, the opening operation control of the lid becomes easy.

According to a fourth aspect of the present invention, in the first aspect of the invention, when the optical pickup is detected to be at a predetermined position by the detecting means, the operation control means includes an optical pickup. The output of a movement signal for moving the pickup is stopped.

According to the fourth aspect of the present invention, when the detecting means detects that the optical pickup is at a predetermined position, the operation control means outputs a movement signal to a motor for moving the pickup. By stopping, the efficiency of the opening operation control of the lid can be improved.

The invention described in claim 5 is the invention according to claims 1, 3, and 4.
In the invention according to any one of the above, the predetermined position is:
It is characterized in that it is the radially innermost position of the disk mounted on the main body.

According to the fifth aspect of the present invention, the predetermined position where the optical pickup moves is the radially innermost position of the disk mounted on the main body, so that the innermost peripheral position is determined. Foreign matter such as dust can be prevented from entering the side position, and the optical pickup can be securely initialized.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, the configuration will be described.

FIG. 1 shows a plan view (a) and a sectional view (b) of a disc player 100 to which the present invention is applied.

In FIG. 1, a disc player 100
Includes a main body 1 and an LID (lid) 2 that covers a disc mounted on a turntable 8 described below from above. The main body 1 includes a spring 4, a cam lock 5, a turntable 8, an optical pickup 9, a traverse 10, and a LID SW.
(Lid switch) 11, Damper 13, SLT SW22
Having. The LID 2 is supported by the support shaft 3 so as to be rotatable in the arrow direction with respect to the main body 1, and has an LID lock portion 6 and a clamper 7.

As shown in FIG. 1 (a), the spring 4 is provided at a portion connecting the main body 1 and the LID 2 along the support axis direction, and constantly biases the LID 2 in the opening direction.

The convex cam lock 5 is provided at a position facing the spring 4 on the opening side of the main body 1, and is biased in the opening direction by the spring 4 when the LID 2 is closed.
Lock 2

The concave LID lock 6 is provided at a position facing the spring 4 on the opening side of the LID 2, and when the LID 2 is closed, the cam lock 5 and the LID lock 6 engage. The closing operation for LID2 is manually performed for LID2.
By pressing down.

The clamper 7 is supported by the inner wall of the LID 2, and a turntable 8 on which a disk is placed is provided on the upper side of the main body 1. The clamper 7 and the turntable 8 are opposed to each other. When the LID 2 is in the closed state, the disc mounted on the turntable 8 is held between the clamper 7 and the turntable 8 from above and below. Has become.

The LID SW (lid switch) 11 is shown in FIG.
As shown in (b), the substantially fan-shaped rotating piece 12 provided on the support shaft 3 of the LID 2 presses the LID SW 11 by the closing operation of the LID 2 provided near the support shaft 3 of the main body 1. As a result, the button at the tip of the LID SW11
N, and when the LID 2 shifts to the open state, the rotating piece 12
Is turned off from the LID SW11. That is, when the LID 2 is in the open state, the CPU
14 monitors whether or not the LID 2 is shifted to the closed state based on whether or not the LID SW 11 is turned on.

The damper 13 has a gear as shown in FIG. 1B, and is attached to the main body 1 so that the gear always meshes with a gear provided on a circumferential portion of the rotating piece 12. I have. When LID2 transitions from the closed state to the open state,
The damper 13 also turns with the turning of the turning piece 12,
Since the rotational resistance is generated in the damper gear, the sudden opening operation of the LID 2 due to the urging force of the spring 4 is suppressed.

Next, the optical pickup 9 and the SLT S
Details of W22 will be described with reference to the main part configuration diagram near the traverse 10 shown in FIG.

As shown in FIG. 2, the turntable 8, the optical pickup 9, the sled 1
8a, a thread support shaft 18b, a thread motor 18c, gears 18d and 18e, a spindle motor 20a, a disk rotation shaft 20b, and an SLT SW22.

The optical pickup 9 is provided in the sled 18a, and irradiates a laser beam to the disk during reproduction of the disk to read data recorded on the disk from the reflected light.

The sled 18a has an optical pickup 9 inside thereof and is reciprocally attached to a sled support shaft 18b provided in a radial direction of a disc mounted on the turntable 8, so that the sled 18a can be used for reproducing a disc. Then, under the control of the tracking sled servo circuit 18, it reciprocates in the traverse 10 along the sled support shaft 18b.

The thread motor 18c is connected to the gear 18d and rotates the gear 18d based on a thread drive signal applied from a tracking thread servo circuit 18, which will be described later, during reproduction of a disk or the like.

The gear 18e is provided at the tip of the thread support shaft 18b (on the inner side of the disk) so as to always mesh with the gear 18d.
And rotates in conjunction with the rotation of the gear 18d, for example, during reproduction of a disc. The rotation of the gear 18e rotates the thread support shaft 18b, and the thread 18a reciprocates along the thread support shaft 18b.

The spindle motor 20a is provided below the turntable 8, and drives the disk mounted on the turntable 8 based on a spindle drive signal applied from a spindle servo circuit 20, which will be described later, when reproducing the disk. The rotation is driven around the rotation shaft 20b as a center axis.

The SLT SW (start limit switch) 22 is provided in the vicinity of the spindle motor 20a, and when the optical pickup 9 is initialized, the sled 18a moved to the innermost circumference presses the button at the tip of the SLT SW 22. As a result, an ON operation is performed, and an ON signal is
Output to When the thread 18a moves to the outer peripheral side, the thread 18a separates from the SLT SW 22 and
Shift to FF operation.

Next, the configuration of the main part of the cam lock 5 (plan view)
Is shown in FIG. The cam lock 5 includes an electromagnetic plunger 51 as an electric key, a rotating shaft 52, a cam 53, and a helical spring 54.

The spring 54 has one end fixed to the main body 1 and the other end fixed to the tip 53a of the cam 53. The tip 53a is connected to the other end 53b of the cam 53 by L.
It is always urged in the direction to engage with the ID lock portion 6.

The cam 53 has a spring 54 fixed to a tip 53a at one end thereof, and the tip 53a is engaged with a movable iron core 51a, which will be described later, protrudes from the electromagnetic plunger 51. When the LID 2 is closed, the other end 53 b of the cam 53 is brought into contact with the LID 2 by the bias of the spring 54.
The locking portion 6 is engaged.

When the LID 2 shifts from the closed state to the open state, the other end 53a of the cam 53 moves against the urging force of the spring 54, and the cam 5 moves with the suction operation of the movable core 51a.
3 rotates about the rotation shaft 52 as a rotation center as a whole, and the engagement between the distal end portion 53b and the LID lock portion 6 is released.

The inside of the electromagnetic plunger 51 is shown in FIG.
As shown in (b), it is configured as a solenoid having a movable iron core 51a provided inside a fixed iron core 51c around which a coil 51b is wound.

When a current flows through the coil 51b based on an unlock signal input from the CPU 14 to be described later when the LID 2 shifts from the closed state to the open state, the fixed iron core 51c becomes an electromagnet and the movable iron core 51a becomes an electromagnetic. It is sucked into the plunger 51.

FIG. 4 is a diagram showing a functional configuration inside the disc player 100 to which the present invention is applied. This figure 4
, The disc player 100 includes a cam lock unit 5, an optical pickup 9, an LID SW11, and a CPU 1.
4, display unit 15, key input unit 16, signal processing circuit 17,
It comprises a tracking thread servo circuit 18, a focus servo circuit 19, a spindle servo circuit 20, a D / A converter 21, and an SLT SW22.

The CPU 14 controls the key input unit 1 by the user.
ROM (Read O)
Various control operations are performed according to the operation program stored in the nly memory. For example, the CPU 14
When an LID2 Open request is made by operating the n key, LID Open processing (or pickup initialization processing) described later is executed (see FIG. 5).

The display unit 15 is an LCD (Liquid Crystal D)
isplay), and performs necessary display processing based on the display control of the CPU 14. For example, the display unit 15
Displays TOC (Table Of Contents) information such as a progress time and a track number at the time of disc reproduction, an operation mode, and the like.

The key input unit 16 includes a play key, a stop key,
It is configured with various operation keys such as LID Open key,
An operation signal by a key operation is output to the CPU 14.

The signal processing circuit 17 performs an arithmetic processing of information detected from the disk by the optical pickup 9 by a reproducing operation of the disk, and generates a tracking error signal,
A focus error signal, a spindle error signal, and the like are generated and output to the tracking thread servo circuit 18, the focus servo circuit 19, and the spindle servo circuit 20. The control signal input from the CPU 14 in accordance with the reproduction instruction from the user by operating the reproduction key is transmitted to the tracking thread servo circuit 18 and the focus servo circuit 1.
9, and to the spindle servo circuit 20.

Further, the signal processing circuit 17 applies E to the data read from the disk by the optical pickup 9.
FM (Eight to Fourteen Modulation) decoding processing,
And CIRC (Cross Interleave Reed-Solomon Code)
A decoding process is performed, the data is read out at a predetermined timing, and output to the D / A converter 21. Also, CP
A thread outer circumference movement signal, a thread inner circumference movement signal, and a thread movement stop signal input from U14 are output to the tracking thread servo circuit 18.

The tracking thread servo circuit 18
During reproduction of the disc, a tracking drive signal is generated based on various signals input from the signal processing circuit 17 to control the two-axis mechanism of the optical pickup 9, and a thread drive signal is generated and applied to the thread motor 18c. This enables the optical pickup 9 to move in the radial direction of the disk.

The focus servo circuit 19 generates a focus drive signal based on a focus error signal input from the signal processing circuit 17 at the time of reproducing a disk.
The two-axis mechanism of the optical pickup 9 is controlled by the focus drive signal and the tracking drive signal, and the distance between the optical pickup 9 and the signal surface of the disk is always kept constant.

The spindle servo circuit 20 applies a spindle drive signal to a spindle motor 20a that supports the turntable 8 on which the disk is mounted, based on various signals input from the signal processing circuit 17 during reproduction of the disk. By doing so, the spindle motor 20a is controlled at a constant linear velocity (CLV: Constant Linear Velocity), and the disk is driven to rotate.

The D / A converter 21 converts the digital audio signal processed by the signal processing circuit 17 into an analog audio signal when reproducing the disc, and outputs the analog audio signal to an amplifier (not shown). The analog audio signal amplified by this amplifier circuit is
It is output to the outside as a playback sound.

The structure and function of the cam lock 5 are as follows.
As described with reference to FIG. 3, the configurations and functions of the optical pickup 9, the LID SW 11, and the SLT SW 22 are the same as those described with reference to FIGS. 1 and 2, and thus description thereof will be omitted. .

Next, the operation of this embodiment will be described. L
The LID Open processing (or pickup initialization processing) from the generation of the LID Open request by the operation of the ID Open key to the actual opening will be described with reference to the flowchart of FIG.

First, the CPU 14 checks whether or not an LID Open request has been generated by operating the LID Open key (step S1). If there is an Open request (step S1;
Yes), outputting a stop signal to the tracking thread servo circuit 18 and the focus servo circuit 19,
A servo stop process is executed (Step S2). On the other hand, if it is determined that there is no LID Open request (step S
1; No), the CPU 14 terminates the LID Open process as it is.

When the servo stop process in step S2 is completed, the CPU 14 checks whether or not the SLT SW 22 is ON (step S3). SLT SW
When the ON signal is detected from the SLT 22 and it is determined that the SLT SW 22 is in the ON state (Step S3; Yes), the CPU
14 outputs to the signal processing circuit 17 a sled outer peripheral movement signal for moving the sled 18a to the outer peripheral side by driving the motor 18c (step S4).

On the other hand, when determining that the SLT SW 22 is in the OFF state (step S3; No), the CPU 14
Assuming that the thread 18a is located at a position away from the SLT SW 22, a thread inner circumference movement signal for moving the thread 18a to the inner circumference side by driving the motor 18c is output to the signal processing circuit 17 (step S13).
The state of W22 is detected (step S10).

During the movement of the sled 18a on the outer peripheral side by the driving of the motor 18c in step S4, the CPU 14
It is confirmed whether or not the thread 18a has separated from the SLT SW 22 and has shifted to the OFF state (step S5).
If it is determined that the state has been shifted (step S5; Yes),
The timer is set to 50 milliseconds (step S6), and the outer peripheral movement of the sled 18a by driving the motor 18c is continued for another 50 milliseconds. This is SLT SW2
This is to prevent erroneous recognition (such as chattering) of the state detection of No. 2.

During the counting of the timer set in step S6, the CPU 14 constantly checks whether or not the counting by the timer has been completed (step S7), and continues this checking work until the counting by the timer is completed (step S7). Step S7; No).

When the counting of the timer set in step S6 ends (step S7; Yes), the CPU 14
Again, it is confirmed whether or not the SLT SW 22 is in the ON state (step S8). At this time, if the SLT SW 22 is in the ON state (step S8; Yes), despite the fact that the thread 18a is moving around by the driving of the motor 18c, the CPU 14 regards the thread 18a as an abnormal state, and In order to continue the outer peripheral movement by driving the motor 18c, the process proceeds to step S5.

In step S8, SLT SW22
Is determined to be in the OFF state (step S8; N
o) Considering that the thread 18a is in the normal state,
A signal for moving the inner circumference of the sled to be moved to the inner circumference side by the driving of 8c is output to the signal processing circuit 17 (step S9), and the outer circumference movement of the sled 18a is switched to the inner circumference movement.

Next, the CPU 14 sets the SLT SW 22
Is turned on (step S1).
0), if it has not been turned on yet (step S1)
0; No), the inner peripheral movement of the sled 18a by driving the motor 18c is continued (step S14), and step S1 is performed.
After returning to 0, the state of the SLT SW 22 is detected again.

In step S10, SLT SW2
When the ON signal is detected from S2 and it is determined that the SLTSW 22 has shifted to the ON state (Step S10; Yes), C
The PU 14 outputs a sled movement stop signal to the signal processing circuit 17 to stop the sled 18a from moving inward by driving the motor 18c (step S11). Next, the CPU 14 outputs an unlock signal to the cam lock unit 5 to permit the LID 2 to shift to the open state (step S12), and ends the LID Open process.

As described above, according to the disc player 100 of the present embodiment, the LID
When there is an Open request for LID2, the thread 18a is moved to the innermost circumference, the optical pickup 9 is returned to the initial position, and then the LID2 is opened. Therefore, immediately after the LID2 transitions to the closed state, the TOC reading of the disc can be performed, and the speed of the disc reproducing operation can be increased.

When the LID 2 is in the open state, the thread 18a is always positioned at the innermost periphery, so that the SLT
Foreign matter such as large dust can be prevented from entering the space between the SW 22 and the thread 18a, and the initialization of the optical pickup 9 can be reliably performed.

[0062]

According to the disk reproducing apparatus of the first aspect of the present invention, after the optical pickup is moved to a predetermined position and then the lid is opened, the lid is moved to the closed state. The speed of the reproducing operation of the disc can be increased.

According to the disk reproducing apparatus of the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, the number of parts is small and the manufacturing cost can be reduced.

According to the disk reproducing apparatus of the third aspect, in addition to the effects of the first or second aspect, by unlocking the lid after the optical pickup is moved to a predetermined position. In addition, the opening operation of the lid can be easily controlled.

According to the disk reproducing apparatus of the fourth aspect, in addition to the effects of the first to third aspects, the efficiency of the lid opening operation control can be improved.

According to the disk reproducing apparatus of the fifth aspect of the present invention, in addition to the effects of the first or third aspect of the present invention, in addition to the radially innermost circumference of the disk mounted on the main body. Foreign matter such as dust can be prevented from entering the side position, and the optical pickup can be securely initialized.

[Brief description of the drawings]

FIG. 1 is a plan view (FIG. 1A) and a cross-sectional view (FIG. 1B) of a disc player 100 to which the present invention is applied.

FIG. 2 is a plan view showing a configuration of a main part near a traverse 10;

FIGS. 3A and 3B are diagrams showing a main configuration of the cam lock portion 5 (FIG. 3A) and a diagram showing the inside of an electromagnetic plunger 51 (FIG. 3B).

FIG. 4 is a block diagram showing a functional configuration of a disc player 100 to which the present invention is applied.

FIG. 5 is a flowchart illustrating LID Open processing according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 LID (lid) 3 Support shaft 4 Spring 5 Cam lock 51 Electromagnetic plunger 51a Movable iron core 51b Coil 51c Fixed iron core 52 Rotating shaft 53 Cam 53a, 53b Cam tip part 54 Helical spring 6 LID lock part 7 Clamper 8 turns Table 9 Optical pickup 10 Traverse 11 LID SW (lid switch) 12 Rotating piece 13 Damper 14 CPU 15 Display unit 16 Key input unit 17 Signal processing circuit 18 Tracking thread servo circuit 18a Thread 18b Thread spindle 18c Thread motor 18d, 18e Gear Reference Signs List 19 focus servo circuit 20 spindle servo circuit 20a spindle motor 20b disk rotation axis 21 D / A converter 22 SLT SW (start limit switch) 100 disk player

Claims (5)

[Claims] 1. A main body on which a disk is mounted, a lid rotatably supported by the main body, an urging means for urging the lid to an open state, and irrespective of urging by the urging means. A disc reproducing apparatus comprising: a lock unit that locks the lid in a closed state; and a command unit that outputs an open command to release the lock and shift the closed lid to an open state to the lock unit. When an open command is issued by the command unit during the reproduction of the disk, the operation of the motor that is performing the reproduction operation of the disk is stopped, and the operation control unit that moves the optical pickup to a predetermined position in the disk radial direction is provided. The apparatus further comprises: a lock unit that, when the operation control unit stops driving a motor that is performing a disk reproducing operation, and moves the optical pickup to a predetermined position, releases the lock and closes the optical pickup. Disk reproducing apparatus characterized by shifting the lid in the open state that. 2. The device according to claim 1, wherein said lock means includes a first lock member provided on said lid, and a second lock member provided on said main body and engaged with said first lock member. 2. The disc reproducing apparatus according to claim 1, wherein A detecting means for detecting whether or not the optical pickup is at a predetermined position; and a first lock by the lock means when the optical pickup is detected to be at a predetermined position. 3. An opening means for outputting a release signal for releasing the engagement between the member and the second lock member to an electric key having the second lock member at the distal end thereof. The disc reproducing device according to the above. 4. When the detecting means detects that the optical pickup is at a predetermined position, the operation control means includes:
4. The disk reproducing apparatus according to claim 1, wherein output of a movement signal for moving the optical pickup is stopped. 5. The disk according to claim 1, wherein the predetermined position is a radially innermost position of a disk mounted on the main body. Playback device.