JPS6316481A - Disk reproducing device for vehicle - Google Patents

Abstract

PURPOSE:To accurately reproduce information regardless of the acceleration/ deceleration of a vehicle by setting a turntable approximately vertical and at the same time setting the rotary plane of the turntable approximately in parallel with the traveling direction of the vehicle. CONSTITUTION:A turntable 3 is set so that its rotary plane is set approximately in parallel with the traveling direction D of the vehicle. Therefore, the focusing direction F is approximately vertical to the direction D. Thus an objective lens 5 is moved in the direction F by the acceleration or deceleration of the vehicle to avoid collision with a disk 1. In the case of an optical disk device, the production of a tracking error signal as well as the production of information are difficult unless focus servo control is applied. Therefore, it is desirable to set the direction F vertical to the direction D (in the direction where the effects of acceleration/deceleration are reduced).

Description

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

[Summary of the invention]

In the present invention, the disk is rotated substantially vertically, and its rotating surface is made substantially parallel 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 an apparatus, as shown in FIG. 4, a disk l placed on a turntable 3 is rotated by a spindle motor 2, and a laser beam is directed onto a disk (CD-ROM) 1. A focus actuator for focusing, a tracking actuator for tracking and controlling the spot light on the disk as an information detection point, and a slider actuator for driving the entire pickup in the disk radial direction are provided.

[Problem that the invention attempts to solve]

In conventional devices, the disk 1 is rotated in a horizontal plane in this way, so especially when a video disk with a relatively large diameter is used as the disk 1, the outer edge of the disk may hang downward. there were. As a result, even if the position of the information detection point is controlled by each actuator, it is difficult to accurately reproduce the information.

[Means for solving problems]

The present invention provides a disc playback device for a vehicle, which includes a disc, a turntable that rotates the disc, and an actuator that drives an information detection point that plays back information from the disc in the radial direction of the disc, and the turntable is rotated substantially vertically. Along with that.

It is characterized in that its rotating surface is approximately parallel to the traveling direction of the vehicle.

[Effect]

The turntable is arranged so that its rotating surface is substantially perpendicular and substantially parallel 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 vertically, and rotates the disc 1 placed thereon substantially vertically. As a result, as shown in FIG. 3, the surface of the disk 1 becomes parallel to the direction of gravity G, and the ends of the disk 1 are prevented from sagging. Further, a laser beam emitted from a light source (not shown) built into the pickup 4 is irradiated onto the disk 1 via the objective lens 5.
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) 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. Since the turntable 3 is installed so that its rotating surface is substantially parallel to the direction of travel of the vehicle, the focus direction F is substantially perpendicular to the direction of travel of the vehicle. Therefore, the objective lens 5 is prevented from moving in the focus direction F due to acceleration or deceleration of the vehicle and colliding with the disk 1. In the case of an optical disc device, unless focus servo is applied, it is difficult not only to reproduce information but also to generate a tracking error signal. Therefore, it is preferable that the focus direction F is perpendicular to the traveling direction of the vehicle (a direction that is less affected by acceleration and deceleration).

- the force objective 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. 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.

The driving direction S and the tracking direction T are substantially parallel to the direction of travel of the vehicle. In other words, the driving directions T, F, S of each of the seven cutuators 6, 7, 8 are arranged as shown in FIG. It is also theoretically possible to make the directions S and T perpendicular to the direction of travel of the vehicle (parallel to the Z-axis direction) while keeping the focus direction F perpendicular to the direction of travel of the vehicle. However, in this case, the relationship with respect to the direction G of one gravitational force is reversed depending on whether the pickup 4 is driven in the inner circumferential direction of the disk 1 or the outer circumferential direction, so that the driving force changes greatly. Therefore, it is preferable to make the directions S and T substantially parallel to the directions as in the embodiment.

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,
The information detection point for reproducing information from the disc is provided with an actuator that drives it in the radial direction of the disc, and the turntable is made approximately vertical and its rotating surface is approximately parallel to the traveling direction of the vehicle. This not only prevents the disc from sagging, but also enables accurate reproduction of information without being affected by acceleration or deceleration of the vehicle.

[Brief explanation of drawings]

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

Claims (1)

[Claims] A disc, a turntable that rotates the disc, and an actuator that drives an information detection point that reproduces information from the disc in the radial direction of the disc, the turntable being rotated substantially vertically. A disc reproducing device for a vehicle, characterized in that the rotating surface thereof is substantially parallel to the traveling direction of the vehicle.