JPS6316474A - Disk reproducing device for vehicle - Google Patents

Abstract

PURPOSE:To accurately reproduce information regardless of the acceleration or deceleration of a vehicle by setting the tracking direction approximately vertical to the traveling direction of the vehicle. CONSTITUTION:An actuator 6 is set so that the tracking direction T is approximately vertical to the traveling direction D of the vehicle. In other words, an objective lens 5 is supported movably in the tracking direction T approximately vertical to the direction D and not movable in the direction parallel to the direction D. Therefore, the effects of acceleration or deceleration of the vehicle are not given to the direction T and therefore the information detecting point jumps tracks by a sudden start or stop of the vehicle. While a pickup 4 is driven in the radius direction S of a disk 1 by a slider actuator 8 in response to a slider error signal. This driving direction S is also approximately parallel to the direction D. Thus each actuator is not affected by the acceleration and deceleration of the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc reproducing device for a vehicle, typified by a vehicle navigation device.

[Summary of the invention]

In the present invention, the tracking direction is a direction substantially perpendicular to the traveling direction of the vehicle.

[Conventional technology]

Recently, research has been conducted on vehicle navigation devices that play back map information recorded on a so-called CD-ROM or the like and display the current location of the vehicle to guide the vehicle to a predetermined destination, and some of them have been commercialized. In such a device, there is a focus actuator for focusing a laser beam on a disk (CD-ROM), a tracking actuator for tracking and controlling a spot light on the disk as an information detection point, and a tracking actuator for controlling the tracking of a spot light on the disk as an information detection point, and also for moving the entire pickup in the disk radial direction. A slider actuator and the like are provided to drive the motor.

[Problem that the invention seeks to solve]

Conventional devices have the disadvantage that such actuators are affected by acceleration and deceleration as the vehicle travels, making it impossible to accurately reproduce information.

[Means for solving problems]

The present invention provides a disc reproducing device for a vehicle, which includes a disc, a turntable for rotating the disc, and an actuator for tracking and controlling an information detection point for reproducing information from the disc in a tracking direction substantially perpendicular to the track of the disc. It is characterized in that the direction is substantially perpendicular to the direction of travel of the vehicle.

[Effect]

The information detection point is tracked and controlled by the actuator, and the actuator is installed so that the tracking direction is substantially perpendicular to the traveling direction of the vehicle.

〔Example〕

FIG. 1 is a perspective view of a vehicle disc playback device according to the present invention. In the same figure, 1 is a CD (compact disc), C
It is a disk such as a D-ROM or a video disk, and predetermined information is recorded thereon.

A spindle motor 2 rotates the disk 1 via a turntable 3. 4 is a pickup;
It has a tracking actuator 6 that drives the objective lens 5 in the tracking direction T, and a focusing actuator 7 that drives the objective lens 5 in the focusing direction F.

A slider actuator 8 drives the pickup 4 in the radial direction of the disk 1.

The turntable 3 is arranged substantially horizontally, and rotates the mounted disc 1 substantially horizontally. Laser light emitted from a light source (not shown) built into the pickup 4 is irradiated onto the disk 1 via the objective lens 5, and the reflected light is received by a light receiving element (not shown). The actuator 7 drives the objective lens 5 in the focus direction F (direction perpendicular to the disk 1, that is, parallel to the gravity G) in response to the focus error signal. As a result, the laser beam is focused on the disk 1, and a reproduction signal of the recorded information can be obtained from the output signal of the light receiving element. Further, the objective lens 5 is driven in the tracking direction T by the actuator 6 in response to the tracking error signal. As a result, the spot light serving as the information detection point on the disc 1 is controlled to follow the track. The actuator 6 is installed so that the tracking direction T is substantially perpendicular to the traveling direction of the vehicle. That is, the objective lens 5 is supported so as to be movable in a tracking direction T substantially perpendicular to the direction of travel of the vehicle, but not movably in a direction parallel to the direction of travel of the vehicle. Therefore, even if the vehicle accelerates or decelerates as it travels, this effect will not appear in the tracking direction, and the information detection point will be prevented from jumping off the track due to sudden start or stop. Further, the pickup 4 is driven in the radial direction S of the disk 1 by a slider actuator 8 in response to a slider error signal. This driving direction S is also substantially perpendicular to the direction of travel of the vehicle. In other words, the drive directions T, F, S of each actuator 6.7.8 are all substantially perpendicular to the direction of travel of the vehicle, as shown in FIG. Therefore, each actuator is not affected by acceleration or deceleration of the vehicle.

Although the present invention has been described above with reference to an example in which the present invention is applied to an optical vehicle disc reproducing device, the present invention can also be applied to vehicle disc reproducing devices using systems other than optical.

〔effect〕

As described above, the present invention provides a disc playback device for a vehicle.
A disc, a turntable that rotates the disc,
It is equipped with an actuator that tracks and controls the information detection point for reproducing information from the disk in a tracking direction that is substantially perpendicular to the track of the disk, and the tracking direction is made to be substantially perpendicular to the direction in which the vehicle is traveling, so that it is possible to control the acceleration of the vehicle. It becomes possible to accurately reproduce information without being affected by deceleration.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a vehicle disc playback device of the present invention, and FIG. 2 is an explanatory diagram of the driving direction of each actuator. 1...Disc 2...Spindle motor 3...Turntable 4...Pickup 5...Objective lens 6.7.8...Actuator or higher

Claims (1)

[Scope of Claims] The tracking device comprises a disk, a turntable for rotating the disk, and an actuator for controlling tracking of an information detection point for reproducing information from the disk in a tracking direction substantially perpendicular to the tracks of the disk. A disc reproducing device for a vehicle, characterized in that the direction is substantially perpendicular to the traveling direction of the vehicle.