JPH0661138B2 - Optical disk tracking device - Google Patents

Description

The present invention relates to a tracking device for tracing a laser beam emitted from an optical system along a track marked on an optical disc in an optical recording / reproducing device.

[Conventional technology]

Conventionally, a tracking drive device of an optical recording / reproducing device has a structure as shown in FIG.

In the figure, the turntable device 10 is a turntable 2
The disk 1 placed on the disk is driven by a motor 3 to rotate, and when eccentricity occurs, the tracking error detector 7 detects the reproduction signal from the optical pickup 4
A tracking error signal is generated. This signal is divided into a low frequency component and a high frequency component by the filter 9,
The low frequency component is applied to the optical pickup feeding mechanism 5 via the optical pickup feeding mechanism drive circuit 8. The high frequency component is applied to the objective lens actuator drive circuit 6 of the optical pickup 4 to cause the objective lens to follow the track.

[Problems to be solved by the invention]

Recently, optical recording / reproducing devices have been used for moving image files having a high data transfer rate by increasing the rotation speed of an optical disk. As a result, the frequency of eccentricity increases and it is difficult to perform accurate tracking servo.

[Means for solving problems]

Therefore, according to the present invention, the pickup and the turntable are moved in the directions opposite to each other in the radial direction of the optical disc. Therefore, the high frequency component of the tracking error signal detected through the optical pickup device is added to the objective lens actuator of the optical pickup. The low frequency component is distributed to the turntable device and the pickup device to perform tracking control.

[Action]

The low-frequency component of the tracking error signal detected through the optical pickup device is controlled so that the turntable and the optical pickup are moved in opposite directions, so that the respective movement amounts are small and high-speed tracking control is performed. .

〔Example〕

The present invention will be described in detail below with reference to examples. First
The figure shows an embodiment of the present invention. The same parts as those in the conventional example shown in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. When the eccentricity occurs due to the rotation of the disk 1, a tracking error signal is generated from the tracking error detector 7 as described above, and the high frequency component of this signal drives the objective lens of the optical pickup 4, and the low frequency component is The turntable feed mechanism 13 is driven via the turntable feed mechanism drive circuit 14 and the pickup feed mechanism 5 is driven in the opposite direction to the turntable 1 via the optical pickup feed mechanism drive circuit 8 by a predetermined distribution value. To do.

As an example, the low frequency components may be added to the optical pickup and the turntable feeding mechanisms 5 and 13 by half, and the feeding operation for each may be moved in the opposite direction by the same amount. As described above, the objective lens actuator in the optical pickup 4, the optical pickup feed mechanism 5, and the turntable feed mechanism 13 are controlled to track the optical disc.

〔The invention's effect〕

As described above, the turntable feed mechanism and the optical pick-up feed mechanism are controlled to feed in the opposite directions, so the travel distance is shared during the track search, so high-speed search can be performed. Regarding the followability from a low speed to a high speed by a servo at a small distance, the turntable feed mechanism side improves the low speed followability due to the driving force of the feed mechanism and the weight driven, and the optical pick-up feed mechanism side becomes lighter. Can be achieved,
Excellent in high-speed followability, these are combined to stabilize tracking control, and high-speed and reliable reproduction can be performed.

[Brief description of drawings]

FIG. 1 is a diagram showing a tracking drive device of an optical recording / reproducing device of the present invention, and FIG. 2 is a diagram showing a tracking device of a conventional optical recording / reproducing device. DESCRIPTION OF SYMBOLS 1 ... Optical disk 2 ... Turntable 3 ... Spindle motor 4 ... Optical pickup 5 ... Optical pickup sending mechanism 6 ... Objective lens actuator drive circuit 7 ... Tracking error detector 8 ... Optical pickup sending mechanism drive circuit 9 ... Filter 10 ... Turntable device 12 ... Distributor 13 ... Turntable feeding mechanism 14 ... Turntable feeding mechanism drive circuit

Claims (1)

[Claims] 1. An apparatus for rotatably driving an optical disk mounted on a turntable, detecting a tracking error signal with an optical pick-up opposed to the optical disk, and controlling the tracking of the optical pick-up in response to the signal to record or reproduce. In the above, a circuit for dividing the tracking error signal into a low frequency component and a high frequency component, an objective lens driving means for driving the objective lens of the optical pickup in accordance with the high frequency component, and an optical component in accordance with the low frequency component An optical pick-up feeding mechanism for moving the pick-up in the tracking direction and a turntable feeding mechanism for moving the turntable in the tracking direction of the optical disc according to the low frequency component are provided, and the moving direction of the optical pick-up and the turntable The feature is that the traveling direction of the Tracking apparatus for an optical disc to be.