JPS61265778A - Support device for moving body - Google Patents

Abstract

PURPOSE:To decrease a mechanical play and to prevent tilt of a moving member by fitting a counter balance to the moving member so as to be a parallel link mechanism with a support member whose fitting part uses an elastic member. CONSTITUTION:A couple of guard shape rubber members 8 are provided to prescribed positions of a steel rod 7 and a support member fitting part 6 provided to a moving member 1, a fulcrum member 3 and a counter balance member 4 is fitted in a way to be clipped by the members 8 to take the mass balance in both vertical and forward/backward directions of the member 1. Thus, a mechanical play is decreased and the tilt of the moving member is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a support device for a movable body, and particularly to a support device for a movable body suitable for supporting a movable body such as an optical head.

2. Description of the Related Art In recent years, optical recording and reproducing devices such as compact disc (CD) players have become widespread, and portable devices have also begun to appear. For such applications, it is important to eliminate posture differences.

FIG. 5 shows an example of a conventional movable body support device.

In FIG. 6, 200 is a lens holder that holds a lens 201 and is a movable body. A precisely finished bearing 203 is press-fitted into the hole 202 of the lens holder 200. A fixed body 204 serves as a yoke for the magnet 206. 206 is a support shaft press-fitted into the fixed body 204;
It is inserted into the bearing 203.

In the movable body support structure configured in this way, the lens 201 moves vertically and horizontally (Japanese Patent Application Laid-Open No. 67-210466
issue).

Problems to be Solved by the Invention In the above configuration, in the case of left and right movement of the lens (movement that rotates about the support shaft 206), counterbalancing the lens 201 is movable, but it is movable in the vertical direction, that is, the support axis 20
It is difficult to counterbalance the movement in the sliding direction with respect to 6. In addition, vibration resistance is important for portable use, and the support shaft 206 and bearing 20
Since there is a mechanical play of 30 to 60 micrometers between 3 and 3, sufficient vibration resistance performance cannot be obtained.

In view of the above problems, the present invention provides a support device for a movable body in which the mass is balanced in all directions with respect to the fulcrum and there is little mechanical play.

Means for Solving the Problems In order to solve the above problems, the movable body support device of the present invention includes a movable member, a fulcrum member, and a movable member arranged so as to balance the mass of the movable member with respect to the position of the fulcrum member. a counterbalance member, a support member for coupling the movable member/fulcrum member/counterbalance member to each other, and a support member mounting portion provided on each of the movable member/fulcrum member/counterbalance member; A pair of roughly collar-shaped elastic members are provided to sandwich the support member mounting portions provided at a plurality of predetermined positions of the support member, and the support member supports the movable member, the fulcrum member, and the counterbalance member. It has a configuration in which they are connected to form a parallel link mechanism.

The above-mentioned movable member is generally an object driven by some kind of driving means. The fulcrum member is a fixed part that holds a system consisting of a movable member and a counterbalance member that balances the mass of the movable member. The support member is a plate-shaped or rod-shaped member, and if it is made of metal, it can also be used as an electrical lead wire. The elastic member is generally made of rubber or the like, and has two brim-like shapes provided at predetermined locations on a rod-shaped or plate-shaped support member, and can be used as a movable member, fulcrum member, It serves to attach the support member to the counterbalance member.

Effects The present invention has the above-mentioned configuration, and thus becomes a movable body support device that has a simple configuration and has a well-balanced mass in all directions for the movable member, and since the connecting portion is a rubber member, there is little substantial mechanical play. Furthermore, since a parallel link mechanism is used, there is no inclination of the optical axis of the lens even when used in an optical head.

EXAMPLE Hereinafter, a movable body support device according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention, and shows an example in which the invention is applied to an optical head of a special optical recording/reproducing machine. In FIG. 1, 1 is a lens holder which is a movable member, and 2 is a lens fixed to the lens holder 1. As shown in FIG. Reference numeral 3 denotes a fulcrum member, which is fixed to a fixed base 5. 4 is a counterbalance member whose mass is balanced with the lens holder 1 and lens 2 with respect to the fulcrum member position. Reference numeral 9 denotes a support member, and a pair of brim-shaped rubber members 8 are provided at predetermined locations on a round steel bar 7, and the movable member, fulcrum member,
The support member attachment portions 6 provided on each of the counterbalance members are sandwiched between a pair of brim-shaped rubber members 8 for attachment. FIG. 2 shows an enlarged view of the rubber member 8. Reference numeral 10 denotes a magnet attachment part provided on the movable member 1 at a position symmetrical to the fulcrum member 3, and a magnet 11 is attached to each of the fulcrum member 3 and the magnet attachment part 10. 13 and 14 are a focusing coil and a tracking coil, respectively, which are attached to the movable member 1. 12 is the internal yoke,
Provided to increase magnetic efficiency. 3 parts,
That is, movable member 1. Fulcrum member 3, counterbalance member 4
The position of the support member mounting portion 6 is determined so that the support member 9 with the attached support member 9 forms a parallel link.

In the configurations of FIGS. 1 and 2, the counterbalance member 4 is a movable member. Since the mass of the lens boulder 1 can be balanced in both the focusing direction (up and down in FIG. 1) and the tracking direction (front and back in FIG. 1), it is not affected by the attitude of the device. In addition, since the support is a parallel link, it has excellent features such as no tilting of the optical axis of the lens.

FIG. 3 shows the elastic member (1.
Another example (corresponding to No. 8) will be shown.

Depending on the use, it may be better for the elastic member to have anisotropy. In other words, in the case of an optical head, the focus direction,
The tracking direction is very soft, and it is better to make it stronger in other directions. For this reason, reinforcing rubber 9, which has a roughly brim-like shape in FIG. 3, is used which is provided in a radial manner and partially serves as a reinforcing material.

In the support member shown in FIGS. 2 and 3, the round bar 21.31 and the support member attachment portion 6 (the first
It is supported by the hole shown in the figure), and wear due to friction in this part may become a problem. Therefore, the shape of the end of the mounting hole of the support member mounting portion 6 can be rounded, and the round bar 2
1.31 parts may also be improved by wrapping it in a rubber member during molding. In addition, other parts of the round bar (22.32 in Figures 2 and 3) may also be wrapped in rubber to suppress resonance. These can be easily done during rubber molding.

FIG. 4 shows another embodiment of the elastic member of the support member used in the present invention. In the elastic member shown in FIGS. 2 and 3, as described above, the steel round bar and the mounting hole of the support member mounting portion are in principle in contact with each other. This embodiment attempts to improve this point.

In FIG. 4, 4b is a support member mounting portion corresponding to 6 in FIG. 1, 47 is a round bar made of steel, and 48 is an elastic member. The support member mounting portion 46 has an opening into which a round rod 47 can be inserted, and also has a hole larger in diameter than the round rod 47. Therefore, the structure is not supported by this hole and the round rod. A concentric convex portion 49 is provided inside the elastic member 48, and this portion holds the circular portion 6o of the support member mounting portion 46 from the outside. Therefore, when this support member is used, essentially hard materials do not come into contact with each other and there is no risk of wear.

Effects of the Invention As described above, the present invention provides a counterbalance to a movable member by attaching a parallel link mechanism using a support member using an elastic member at the mounting portion, which is not affected by a difference in posture and is mechanically stable. It has excellent features such as less play and the movable member does not tilt.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a movable body support device according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of a support member that is a component of FIG. 1, and FIG. 3 is a diagram showing another embodiment of the support member. Perspective view shown, No. 4
Figures (A) and (B) are a side sectional view and a front view of main parts of another embodiment, and FIG. 6 is an exploded perspective view of a conventional support device. 1... Movable member, 3... Fulcrum member, 4
...Counterbalance member, 6...Support member mounting portion, 9...Support member, 8...
・Elastic member. Name of agent: Patent attorney Toshio Nakao and 1 other person9-
11 Support member 2I Fig. 3 8 Fig. 4 (a) (”
口゛）Figure 5

Claims (1)

[Claims] a movable member, a fulcrum member, a counterbalance member arranged to balance the mass of the movable member with respect to the fulcrum member position, and a support member for interconnecting the movable member, the fulcrum member, and the counterbalance member. a support member provided on each of the movable member, fulcrum member, and counterbalance member; and a pair of generally brim-shaped members provided at a plurality of predetermined positions on the support member so as to sandwich the support member mounting portion. 1. A support device for a movable body, comprising an elastic member, wherein the support member connects the movable member, the fulcrum member, and the counterbalance member to form a parallel link mechanism.