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CD apparatus

一种光盘装置、控制方法的技术，应用在光束引导装置、用光学方法记录/重现、光束源等方向，能够解决光头小型化困难、成本上升、光盘装置小型化困难等问题

Inactive Publication Date: 2007-04-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned conventional optical disc device, in order to ensure the installation space of the tilt sensor, it becomes difficult to miniaturize the optical head.
Therefore, it becomes difficult to miniaturize the optical disc device
In addition, the tilt sensor itself also constitutes a factor that increases the cost of the optical disc device.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0135] Fig. 5 is a block diagram showing a first embodiment of an optical disc device according to the present invention. In the optical disk drive 801, the optical disk 100 is mounted on a motor 101 corresponding to the rotating device, and rotates at a predetermined number of rotations. The motor 101 is controlled by a motor control unit 102 corresponding to the rotation control device. The number of revolutions of the motor 101 is set by a microcomputer 130 (hereinafter referred to as microcomputer 130 ). The rotation detection unit 131 outputs a pulse every time the motor 101 makes one rotation. Hereinafter, this signal is referred to as a 1-rotation signal (PG). The 1 rotation signal is sent to the microcomputer 130 .

[0136] The optical disc 100 has a substrate with a predetermined thickness, and irradiates a light beam to a data surface which is one surface of the substrate. On the data surface, a spiral track made of unevenness is formed. In the optical head 114,...

no. 2 Embodiment

[0214] Fig. 9 is a block diagram showing a second embodiment of the optical disc device of the present invention. In the optical disk drive 802 shown in FIG. 9, like the first embodiment, the same reference numerals are assigned to the same components.

[0215] In the optical disc device 802 , the objective lens 103 is attached to the movable part of the actuator 309 . The actuator 309 includes a focusing coil 352 , a tracking coil 351 , a tilting coil 350 and four permanent magnets (not shown). The focusing coil 352 , the tracking coil 351 , and the tilting coil 350 correspond to a focusing direction moving device, a tracking direction moving device, and an objective lens tilting device, respectively.

[0216] When a voltage is applied to the focusing coil 352 using the focus drive unit 302, a current flows through the coil to generate magnetic flux. When the magnetic flux generated by the focusing coil 352 acts on the magnetic flux of the permanent magnet, the objective le...

no. 3 Embodiment

[0230] Fig. 11 is a block diagram showing a third embodiment of the optical disc device of the present invention. In the optical disk drive 803 shown in FIG. 11, the same reference numerals are given to the same components as those in the second embodiment.

[0231]In the optical disc device 803 , the FE signal output from the FE signal generation unit 115 is sent to the focus drive unit 302 through the phase compensation unit 116 and the subtraction unit 500 . The focus drive unit 302 flows a current corresponding to an input signal to the focus coil 352 through the drive current detection unit 310 . The drive current detection unit 310 detects the current flowing through the focusing coil 352 . The output of the drive current detection unit 310 is sent to the microcomputer 506 and one - terminal of the subtraction unit 500 (terminal indicated by "-1" in the figure). At this time, the terminal a and the terminal d of the switch 501 are connected. In addition, the other - t...

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Abstract

An optical disc apparatus comprises: rotating means for rotating an information recording medium; a light source for irradiating a light beam onto a data side of the information recording medium; converging means for converging said light beam; focus error detecting means for detecting a difference between said data side and the focus of the light beam converged by said converging means; focus direction transferring means for transferring said converging means in a direction perpendicular to said data side; focus controlling means for driving said focus direction transferring means based on the output of said focus error detecting means in such a way that said light beam converges on said data side in a predetermined state; tracking direction transferring means for transferring said light source in the radius direction of said information recording medium; and tilt calculating means for calculating average values of the outputs of said focus controlling means obtained for a period of time, which is an integer multiple of a period during which said information recording medium makes one rotation at two different points in said radius direction and calculating an inclination of said data side based on said average values at said two different points.

Description

technical field [0001] The present invention relates to an optical disc device which records data on a recording medium such as an optical disc by using a light beam and reproduces the data recorded on the recording medium. In particular, it relates to an optical disc device having a mechanism for controlling an incident angle of a light beam to a data surface of a recording medium. Background technique [0002] In an optical disc device, the angle at which the data plane deviates from the vertical to the optical axis of a light beam irradiated on a recording medium such as the optical disc device is called a tilt angle, and a case where the tilt angle is not zero is called a tilt. As the recording density of recording media such as optical discs increases, control of the tilt angle becomes an important issue. When the skew angle occurs, the deterioration of the jitter of the recording or reproduction signal becomes noticeable, and it becomes difficult to ensure the perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/09G11B7/125G11B7/135G11B7/095
CPCG11B7/094G11B7/0956G11B7/0945
Inventor 近藤健二久世雄一藤亩健司山田真一渡边克也阿部雅祥
Owner PANASONIC CORP