JP2006172589A - Access control method for optical pickup and access control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adaptively shorten recovery time by optimizing latency time depending on rotational speed of an optical disk and a position of an optical pickup. <P>SOLUTION: The method is an access control method for the optical pickup in which data, read from an optical disk 10 via an optical pickup 11, is temporarily stored in a shock proof memory 15. The method includes a step for determining the rotational speed of the optical disk and a position of the optical pickup on the optical disk during data connection operation, a step for setting up the connection operation starting position depending on the rotational speed and the position of the optical pickup, a step for moving the optical pickup to the connection operation starting position and performing the access to the data connection position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical pickup access control method and an optical pickup access control device mounted on an optical disk (CD) device, and more particularly to a shock proof technique.

  If the optical pickup is just landed at the data connection position on the optical disk, there may be a case where the data connection cannot be performed correctly due to factors such as mechanical variation. The shock proof connection operation avoids this inconvenience. In the shockproof connection operation, the optical pickup is landed at the connection operation start position that is a position several frames before the data connection position, and the optical pickup is moved toward the data connection position from there. As a result, the optical pickup can surely reach the data connection position.

  Hereinafter, the prior art will be described with reference to the drawings.

  FIG. 1 is a block diagram showing the configuration of the optical disk apparatus. In FIG. 1, 10 is an optical disk, 11 is an optical pickup, 12 is an optical pickup driver, 13 is a servo LSI, 14 is a microcomputer, and 15 is a shock-proof memory.

  The laser emitted from the laser integrated with the optical pickup 11 is reflected by the optical disc 10 and reaches the optical pickup 11 through the lens. The optical pickup 11 converts this into an electric signal, amplifies it, generates a focus error signal and a tracking error signal, and inputs them to a servo LSI 13 that also serves as signal processing. The servo LSI 13 performs focus servo processing from the focus error signal, amplifies the control signal through the optical pickup driver 12, and controls the focus motor (not shown) to perform lens focus control. Also, tracking servo and traverse servo processing is performed from the tracking error signal, and the control signal is amplified through the optical pickup driver 12 to perform tracking control. Finally, CLV (Constant Linear Velocity) servo processing is performed by the synchronization signal, and the rotational speed of a spindle motor (not shown) that rotates the optical disk 10 is controlled.

  A signal processing circuit provided in the servo LSI 13 demodulates the signal read from the optical disk 10 and stores it in the shock proof memory 15. At this time, the data stored in the shock proof memory 15 is DA-converted from the shock proof memory 15 by the DF-DAC in the servo LSI 13 and analog audio is output.

  Next, processing in the case of performing a voice search in the conventional optical disc apparatus will be described with reference to FIG.

  In step S41, the microcomputer 14 moves the optical pickup 11 to the connection operation start position, and proceeds to step S42. Next, in step S42, the process waits until the optical pickup 11 moves to the data connection position. After the movement is completed, the process proceeds to step S43 to start data connection.

According to the shock proof connection operation based on the above algorithm, the optical pickup can surely reach the data connection position even if there is a mechanical variation or the like, and the data connection in the shock proof memory can be realized with high accuracy.
JP-A-10-228754 (page 3-4, FIG. 1-2)

  By the way, it is preferable that the optimum value of the waiting time at the time of data connection changes adaptively if the rotation speed of the optical disk changes. Moreover, it is preferable that the optimum value of the waiting time at the time of data connection also changes adaptively if the position of the optical pickup on the optical disk changes.

  However, in the above-described conventional optical pickup control method, the waiting time until the optical pickup moves from the connection operation start position to the data connection position is always constant regardless of the rotation speed of the optical disk and the optical pickup position. . In this case, the recovery time at the time of the earthquake shock including the data connection time cannot be reduced in order to improve the shock proof function (seismic resistance).

  An object of the present invention is to solve the above-described problems and to optimize the waiting time according to the optical disk rotation speed and the optical pickup position and adaptively shorten the recovery time.

  In order to solve the above problems, the present invention takes the following measures.

As a first solving means, an optical pickup control method according to the present invention includes:
An optical pickup access control method for temporarily storing data read from an optical disc via an optical pickup in a shock proof memory,
Determining the rotation speed of the optical disc during data connection operation;
Setting a connection operation start position according to the rotation speed;
Moving the optical pickup to the connection operation start position and then accessing the data connection position.

An optical pickup access control device that realizes this optical pickup access control method is:
An optical pickup access control device for temporarily storing data read from an optical disc through an optical pickup in a shock proof memory,
Means for determining the rotation speed of the optical disc during data connection operation;
Means for setting a connection operation start position according to the rotation speed;
Means for accessing the data connection position after moving the optical pickup to the connection operation start position.

  According to this, the standby time before data connection can be optimized according to the optical disk rotation speed before the data connection operation in the shock proof, and standby waste due to an increase in the rotation speed can be reduced.

  By the way, this solution cannot optimize the standby time according to the change of the optical pickup position. The second solution means described below is to solve such problems in consideration.

As a second solution, the optical pickup control method according to the present invention includes:
An optical pickup access control method for temporarily storing data read from an optical disc via an optical pickup in a shock proof memory,
Determining the position of the optical pickup on the optical disc during a data connection operation;
Setting a connection operation start position according to the optical pickup position;
Moving the optical pickup to the connection operation start position and then accessing the data connection position.

An optical pickup access control device that realizes this optical pickup access control method is:
An optical pickup access control device for temporarily storing data read from an optical disc through an optical pickup in a shock proof memory,
Means for determining the position of the optical pickup on the optical disc during data connection operation;
Means for setting a connection operation start position according to the optical pickup position;
Means for accessing the data connection position after moving the optical pickup to the connection operation start position.

  According to this, the standby time before data connection can be optimized according to the optical pickup position before the data connection operation in the shock proof, and standby waste due to a change in the optical pickup position can be reduced.

  By the way, with this solution, the waiting time cannot be optimized by the rotation speed of the optical disk. The third solution means described below is to solve such problems in consideration.

As a third solution, the optical pickup control method according to the present invention is:
An optical pickup access control method for temporarily storing data read from an optical disc via an optical pickup in a shock proof memory,
Determining the rotational speed of the optical disc and the position of the optical pickup on the optical disc during a data connection operation;
Setting a connection operation start position according to the rotation speed and the optical pickup position;
Moving the optical pickup to the connection operation start position and then accessing the data connection position.

An optical pickup access control device that realizes this optical pickup access control method is:
An optical pickup access control device for temporarily storing data read from an optical disc through an optical pickup in a shock proof memory,
Means for determining the rotational speed of the optical disc and the position of the optical pickup on the optical disc during the data connection operation;
Means for setting a connection operation start position according to the rotation speed and the optical pickup position;
Means for accessing the data connection position after moving the optical pickup to the connection operation start position.

  According to this, the waiting time before data connection can be optimized according to the combination of the optical disk rotation speed and the optical pickup position before the data connection operation in the shock proof, resulting from the change in the rotation speed and the optical pickup position. It is possible to reduce waiting waste.

  According to the first solution of the present invention, the waiting time before data connection can be optimized according to the rotation speed of the optical disk before the data connection operation in the shock proof, thereby reducing waiting waste caused by the increase in rotation speed. can do.

  According to the second solution of the present invention, the waiting time before data connection can be optimized according to the optical pickup position before the data connection operation in the shock proof, and standby waste due to a change in the optical pickup position can be achieved. Can be reduced.

  According to the third solution of the present invention, the waiting time before data connection can be optimized according to the combination of the optical disk rotation speed and the optical pickup position before the data connection operation in the shock proof, and the change in the rotation speed In addition, standby waste due to a change in the optical pickup position can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The optical disc apparatus according to the embodiment of the present invention has a block configuration as shown in FIG. 1 as in the prior art. That is, in order to reproduce the optical disk 10, an optical pickup 11, an optical pickup driver 12, a servo LSI 13, a microcomputer (microcomputer) 14, and a shock proof memory 15 are provided. The normal operation excluding the voice search process is the same as that of the conventional optical disc apparatus, and thus description thereof is omitted.

(Embodiment 1)
The optical pickup control method according to the first embodiment of the present invention will be described below with reference to the flowchart shown in FIG. Here, it is assumed that the audio reproduction operation has already started.

  In step S11, the microcomputer 14 determines the current reproduction speed, that is, the rotation speed of the optical disc 10. In the microcomputer 14, data connection positions corresponding to the respective rotation speeds are set as table data in advance. The connection operation start position is set from the table data prepared in the microcomputer 14 in accordance with the rotational speed determined in steps S12 to S14. FIG. 3 shows an example of table data. The address of the connection operation start position is obtained by subtracting a predetermined number of frames from the data connection position. As the rotation speed increases, the number of subtracted frames decreases. This optimizes the waiting time according to the rotation speed, and always makes the recovery time the minimum necessary.

  In step S15, the optical pickup 11 is moved to the set connection operation start position for access, and in step S16, it is confirmed whether the optical pickup 11 has reached the data connection position of the shock proof memory 15. When the optical pickup 11 reaches the data connection position, data connection is performed in step S17, and the reproduction operation is continued.

  According to the access control technology of the optical pickup of the present embodiment, the standby time at the time of data connection can be optimized according to the change in the rotation speed of the optical disk, and the time required at the time of data connection can be shortened.

(Embodiment 2)
The optical pickup control method according to the second embodiment of the present invention will be described below with reference to the flowchart shown in FIG. Here, it is assumed that the audio reproduction operation has already started.

  In step S <b> 21, the microcomputer 14 determines at which position (inner circumference, middle, outer circumference) of the optical disc 10 the current optical pickup 11 is located. In the microcomputer 14, a data connection position corresponding to the position of the optical pickup on the optical disc 10 is set in advance as table data, and a connection operation start position is set according to the determined optical pickup position. FIG. 5 shows an example of table data. As for the address of the connection operation start position, the number of frames to be subtracted decreases as the optical pickup position becomes the outer peripheral side. This optimizes the standby time according to the optical pickup position, and always minimizes the recovery time.

  In step S22, access is performed by moving the optical pickup 11 to the set connection operation start position, and in step S23, it is confirmed whether the optical pickup 11 has reached the data connection position of the shock proof memory 15. When the optical pickup 11 reaches the data connection position, data connection is performed in step S24, and the reproduction operation is continued.

  According to the access control technology of the optical pickup of the present embodiment, the standby time at the time of data connection can be optimized according to the change of the position of the optical pickup on the optical disc, and the time required at the time of data connection can be shortened.

(Embodiment 3)
The optical pickup control method according to Embodiment 3 of the present invention will be described below with reference to the flowchart shown in FIG. Here, it is assumed that the audio reproduction operation has already started.

  In step S31, the microcomputer 14 determines the current optical disk rotation speed and the optical pickup position, and sets a connection operation start position from table data prepared in the microcomputer 14 in advance. FIG. 7 shows an example of table data. As for the address of the connection operation start position, the number of frames to be subtracted decreases as the rotational speed increases and as the optical pickup position moves toward the outer periphery. This optimizes the standby time according to the rotational speed and the optical pickup position, and always minimizes the recovery time.

  In step S32, access is performed by moving the optical pickup 11 to the set connection operation start position, and in step S33, it is confirmed whether the optical pickup 11 has reached the data connection position of the shock proof memory 15. When the optical pickup 11 reaches the data connection position, data connection is performed in step S34, and the reproduction operation is continued.

  According to the access control technology of the optical pickup of the present embodiment, the waiting time at the time of data connection can be optimized according to the change in the rotation speed of the optical disc and the change in the position of the optical pickup, and the time required at the time of data connection can be shortened. be able to.

  INDUSTRIAL APPLICABILITY The present invention is useful as an access control method / control device for an optical pickup mounted on an optical disc apparatus for audio with a shockproof memory.

Block diagram showing the configuration of an optical disc apparatus common to the present invention and the prior art The flowchart which shows operation | movement of the access control method of the optical pick-up of Embodiment 1 of this invention. Configuration diagram of table data in the microcomputer in the optical pickup access control apparatus according to the first embodiment of the present invention. Flowchart showing the operation of the optical pickup access control method according to the second embodiment of the present invention. Configuration diagram of table data in the microcomputer in the optical pickup access control apparatus according to the second embodiment of the present invention. Flowchart showing the operation of the optical pickup access control method according to the third embodiment of the present invention. Configuration diagram of table data in the microcomputer in the optical pickup access control apparatus according to the third embodiment of the present invention. The flowchart which shows operation | movement of the access control method of the optical pick-up in a prior art.

Explanation of symbols

10 Optical Disk 11 Optical Pickup 12 Optical Pickup Driver 13 Servo LSI
14 Microcomputer
15 Shockproof memory

Claims (6)

An optical pickup access control method for temporarily storing data read from an optical disc via an optical pickup in a shock proof memory,
Determining the rotation speed of the optical disc during data connection operation;
Setting a connection operation start position according to the rotation speed;
And an access control method for the optical pickup, including the step of accessing the data connection position after moving the optical pickup to the connection operation start position. An optical pickup access control method for temporarily storing data read from an optical disc via an optical pickup in a shock proof memory,
Determining the position of the optical pickup on the optical disc during a data connection operation;
Setting a connection operation start position according to the optical pickup position;
And an access control method for the optical pickup, including the step of accessing the data connection position after moving the optical pickup to the connection operation start position. An optical pickup access control method for temporarily storing data read from an optical disc via an optical pickup in a shock proof memory,
Determining the rotational speed of the optical disc and the position of the optical pickup on the optical disc during a data connection operation;
Setting a connection operation start position according to the rotation speed and the optical pickup position;
And an access control method for the optical pickup, including the step of accessing the data connection position after moving the optical pickup to the connection operation start position. An optical pickup access control device for temporarily storing data read from an optical disc through an optical pickup in a shock proof memory,
Means for determining the rotation speed of the optical disc during data connection operation;
Means for setting a connection operation start position according to the rotation speed;
An access control device for an optical pickup, comprising: means for accessing the data connection position after moving the optical pickup to the connection operation start position. An optical pickup access control device for temporarily storing data read from an optical disc through an optical pickup in a shock proof memory,
Means for determining the position of the optical pickup on the optical disc during data connection operation;
Means for setting a connection operation start position according to the optical pickup position;
An access control device for an optical pickup, comprising: means for accessing the data connection position after moving the optical pickup to the connection operation start position. An optical pickup access control device for temporarily storing data read from an optical disc through an optical pickup in a shock proof memory,
Means for determining the rotational speed of the optical disc and the position of the optical pickup on the optical disc during the data connection operation;
Means for setting a connection operation start position according to the rotation speed and the optical pickup position;
An access control device for an optical pickup, comprising: means for accessing the data connection position after moving the optical pickup to the connection operation start position.

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