JPH01134511A - Damping device for mobile object - Google Patents

Abstract

PURPOSE:To accurately position the mobile objects despite the undesired force applied to the moving directions of the mobile objects by fixing two mobile objects having the same mass at a belt set at a position where both mobile objects try to move in the directions opposite to each other. CONSTITUTION:The mobile objects 14 and 15 of the same mass are set symmetrically to each other centering on an optical disk 1. The information are recorded on both sides of the disk 1 and read by the pickups 5A and 5B respectively. The carriages 4A and 4B forming the objects 14 and 15 are fixed by arms 13A and 13B at a position of a belt 12 hooked between pulleys 16 and 17 where the objects 14 and 15 move in the direction opposite to each other. When the undesired forces such as impacts, vibrations, etc., are applied to the moving directions of both objects 14 and 15, the forces of the same degree and same direction are applied to both objects. These forces are offset via the belt 12 and therefore the movements of both objects 14 and 15 are prevented. Thus these objects 14 and 15 are accurately positioned.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a braking device for a moving body that can be positioned with high precision in the direction of movement.

[Conventional technology]

FIG. 3 is a block diagram showing a conventional braking device for a movable body disclosed in, for example, Japanese Unexamined Patent Publication No. 58-211363, and is applied to an optical disk device.

In the figure, (11 is a disc-shaped optical disk on which information is recorded by an optical method, and is rotated at high speed by a spindle motor (21). (3) is near the optical disk (1), It is a cylindrical guide rail provided along the radial direction.(4) is a carriage which is a linearly driven moving body and has a figure 8 cross-sectional shape.
It is bilaterally symmetrical and is installed on the guide rail (3),
The optical disc (11) is driven at high speed in the radial direction along the guide rail (3). 151 is a pickup installed on the carriage (4), which reads information recorded on the optical disc (1) and drives the optical disc (11) at high speed. +11 to record information.

Figure 4 shows the drive mechanism of the carriage (4).
FIG. 4 is a partial front view of FIG. 3 viewed from the moving direction of the carriage (4). (6) is a prismatic center yoke fixed to both sides of the carriage (4). (7) is the yoke (6
) is a voice coil wound around the (81 is a magnet placed around the voice coil (7) so as to surround it from three sides.The above yoke (6), coil (7), and magnet (8) are used to drive the carriage (4). (9) is a flat rail provided near the magnet (8). The concave portions are bearings provided on both sides of the carriage (4). It rotates. αυ rotates while pressing the dovetail and guide rail (3) symmetrically from an oblique direction using two bearings provided in the center of the carriage (4).

A conventional braking device for a moving body is configured as described above, and a pickup (5) on a carriage (4) is used to read information on an optical disk (11) or record information on the optical disk (11).
1 to a predetermined position, a driving current flows through the voice coil (7), and an electromagnetic force acts between the magnetic field created by the yoke (61 and the magnet (8)). The yoke +61 and carriage (4) are connected to the guide rail (
3). When the pickup (5:) reaches a predetermined position, the drive current stops flowing and the carriage (4) stops.Then, the carriage (4)
The bearing αυ is controlled in the left and right direction by the idle rail (3) and moves smoothly on the guide rail (3). Furthermore, these, the bearing (1), and the flat rail (91) prevent the carriage (4) from shifting in the vertical direction.

[Problem that the invention seeks to solve]

In the conventional braking device for a moving body as described above, displacement of the carriage (41) can be suppressed in a direction perpendicular to the direction of movement of the carriage (4), but in the direction of movement of the carriage (4) If a force due to shock or vibration is applied in the same direction as the carriage (4), the positional shift of the carriage (4) cannot be prevented and accurate positioning becomes difficult.

This invention was made to solve such problems, and provides a braking device for a moving body (carriage) that can accurately position the moving body even if unnecessary force is applied in the moving direction of the moving body (carriage). The purpose is to

[Means for solving problems]

The braking device for a movable body according to the present invention has a second movable body that has the same mass as a linearly driven first movable body and can move in parallel to this movable body, and a second movable body that is wound between a pulley and a second movable body that has the same mass as a first movable body that is driven linearly. , which has a portion that is parallel to the moving direction of the moving body and moves in mutually opposite directions, and a belt to which each of the moving bodies is connected is provided at each of the portions.

[Effect]

In this invention, since the masses of the two moving bodies are equal and each is fixed to the belt at the point where it is intended to move in the opposite direction, even if unnecessary force is applied in the direction of movement of the moving bodies, the mass will be equal. A force in the same direction acts on each moving body, and this force is canceled out through the belt.

〔Example〕

FIG. 1 is a block diagram showing a braking device for a movable body according to the present invention, when applied to an optical disk device. ￥J2
The figure is a partial front view showing the drive mechanism of FIG. 1 viewed from the direction of movement. In Figures 1 and 2, (1) to (3)
and 151 to υ are the same as those of the conventional device.

(4A) is a carriage that is installed on the guide rail (3A) and driven linearly along the guide rail (3A), and is bilaterally symmetrical and has a figure-8 cross-sectional shape, with one end being a bell). Arm (13A) fixed to tA2J,
Pickup (5A), center yoke (6A),
Voice coil (7A), bearing (IOA).

(IIA). The carriage (4A), arm (13A), pickup (5A), etc. constitute a first moving body I that is linearly driven. The second moving body has the same mass as the first moving body I and can move parallel to the first moving body I with the optical disc (1) in between. It has a symmetrical structure with the moving body αno, and has a carriage (sum) and an arm (13B).
, pickup (5B), etc. The frame and frame are pulleys (belt wheels) that rotate around central axes located at two distant points on the axis of symmetry. The above belt (17
J is wound between the boos IJ (161, (17)), and the above arm (
13A) and (13B) for each mobile object I.

u9 is connected.

In the braking device for a moving body configured as described above,
Optical disc (with 11 pieces in between, upper and lower moving body α4), (
151 have the same mass and are arranged symmetrically. Information is recorded on both sides of the optical disc Il+, and the information recorded on each side can be read with each pickup (5A) and (5B). Therefore, unlike the conventional apparatus, there is no need to turn over the optical disc fi+. The method of driving the pickup (5A), (5)1) fixed on the carriage C4k), (4)1), configured on the moving bodies α4), (15)1) is the same as the conventional method.

However, since both carriages (4A) and (4B) are fixed to belt az and are designed to move in opposite directions, normally one carriage (4A) or (4i, l
) and not the other. However, from the beginning both moving bodies α4) are on both sides of the optical disc (1).
(15) is used to synchronize recording on both sides, or when both drive mechanisms are operated in precise synchronization, it is necessary to read the information on both sides of the optical disc (11) at the same time. is also possible.

In addition, in this device, in the moving direction of the moving bodies I and α4,
Even if unnecessary forces such as shocks and vibrations are applied, each moving object C
14), (151 have the same mass, and the arm (13A
), (13) Due to 1), the bell) acts, and this force is canceled out via the belt α';!J, thereby preventing the movement of the movable bodies ua, (Ls. Therefore, the device is capable of accurately positioning the movable bodies H, (15).

In addition, in the above embodiment, the case where exactly the same moving body side (1s) is provided on the upper and lower sides of the optical disc [11 was shown, but if the total mass of the upper and lower moving bodies is made equal, the pickup on one side (5B) and center yoke (□□□)
etc. may be omitted.

In addition, in the above embodiment, two boos IJ (16),
Although the case where (L?) is located on the above-mentioned axis of symmetry has been shown, there may be two or more pulleys, or there may be no pulleys located on the above-mentioned axis of symmetry. It is only necessary that the belt (121) wound around the pulley achieves the same effect as in the above embodiment.

Furthermore, the moving object braking device according to the present invention can be applied to devices other than optical disk devices.

[Effects of the Invention] As explained above, the present invention includes a second moving body that has the same mass as the first moving body and can move parallel to it, and a second moving body that has the same mass as the first moving body and can move in parallel with the first moving body, and Since the structure has parts that move in the same direction, and a belt to which the above-mentioned moving bodies are connected is provided at each part, even if an unnecessary force is applied in the direction of movement, each moving body has the same magnitude and the same direction. Since these forces are canceled out through the belt, the position of the movable body does not shift and the movable body can be accurately positioned.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a braking device for a movable body showing an embodiment of the present invention, FIG. 2 is a partial front view of FIG. 1 showing a drive mechanism,
Fig. 3 is a configuration diagram showing the conventional device, and Fig. 4 shows the drive mechanism! F, a partial front view of FIG. 3; In the figure, (lz is the belt, αxun is the first moving body, (
19 is a second moving body, and (161 and C17) are pulleys. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A first movable body that is driven linearly, a second movable body that has the same mass as the movable body and can move in parallel to the movable body, and a plurality of pulleys; It has a part that is parallel to the moving direction of the moving body and moves in mutually opposite directions,
A braking device for a movable body, comprising a belt to which each of the movable bodies is connected at each location.