JPH05101425A - Two-axis actuator - Google Patents

Abstract

PURPOSE:To facilitate working, to provide a dumping effect and to automate a suspension assembling by constituting the suspension with a leaf spring stuck with an adhesive tape. CONSTITUTION:A tape 31 with an adhesive agent is stuck to the surfaces of the leaf springs 12 and 15 of a suspension 2 of this actuator. In this case, by the function of the tape 31 with the adhesive agent, the leaf springs 12 and 15 of the suspension are provided with the dumping effect. Also, since workings of piercing the leaf springs 12 and 15, etc., are operated by press work on the adhesive agent of the tape 31, a manufacturing cost is reduced. Further, the tape 31 with the adhesive agent is stuck to the leaf springs 12 and 15 and the assembling of the suspension 2 is automated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biaxial actuator which is provided in a disk recording / reproducing apparatus or the like and performs focus adjustment and tracking adjustment of an optical pickup.

[0002]

2. Description of the Related Art FIG. 3 shows a schematic structure of a biaxial actuator for performing focus adjustment and tracking adjustment of an optical pickup. In FIG. 3, an optical pickup 3 is attached to one end of a base 1 via a suspension 2 so as to be vertically and horizontally movable. A pair of focus coils 4 and a tracking coil (not shown) are provided on both left and right sides of the optical pickup 3, and an objective lens 5 is attached to the tip thereof. And the focus coil 4
When the optical pickup 3 is energized, the optical pickup 3 moves to the arrow A-A.
By rotating in the vertical direction indicated by and energizing the tracking coil, the tracking coil is rotated in the horizontal direction indicated by arrow BB. A laser diode 6 and a photodiode 7 are provided on both side surfaces of the base 1, respectively.

4 to 6 show an example of the configuration of a conventional suspension. In these drawings, the suspension 2 includes a base-side mounting portion 11, one end of each of which is connected to the base-side mounting portion 11, and a pair of upper and lower leaf springs 12 arranged substantially horizontally and a leaf spring 12 Is connected to each other, and a leaf spring 15 that connects the optical pickup side mounting portion 14 and the connecting member 13 is formed. The leaf spring 15 is arranged in a substantially vertical direction, and both ends thereof are connected to the centers of the connecting member 13 and the mounting portion 14 in the width direction, respectively. The leaf springs 12 and 15 are provided with lightening portions 12a and 15a, respectively, in order to reduce the spring constant.

When using the suspension 2 having the leaf springs 12 and 15 as described above, it is necessary to damp the movement of the objective lens 5. For this reason, conventionally, as shown in FIG. 6, a rubber sheet 22 is sandwiched between two thin spring plates 21 to provide a damping effect.

[0005]

However, in order to form the leaf spring as described above, three parts, that is, the two spring plates 21 and the rubber sheet 22 are required, which causes a problem that the cost is high. It was Further, automation of manufacturing was also difficult. In addition, an etching step is required to carry out the lightening process, resulting in an increase in cost.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a biaxial actuator capable of providing a damping effect by using a leaf spring which is easy to process and inexpensive.

[0007]

A biaxial actuator according to the present invention has a suspension that supports an objective lens portion of an optical pickup so that the objective lens portion can move vertically and horizontally, and focus adjustment and tracking adjustment of the optical pickup can be performed via the suspension. In the two-axis actuator to perform,
It is characterized in that the suspension is composed of a leaf spring to which an adhesive tape is adhered.

[0008]

In the biaxial actuator having the above construction, the leaf spring having the damping effect can be manufactured at a low cost by a simple process of simply adhering the adhesive tape to the leaf spring.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the biaxial actuator of the present invention will be described below with reference to the drawings.

1 and 2 show the configuration of an embodiment of the present invention. In these figures, parts corresponding to those of the conventional example shown in FIGS. 4 and 5 are designated by the same reference numerals, and description thereof will be omitted as appropriate. The feature of this embodiment is that the leaf spring 12,
In that the adhesive tape 31 is adhered to the surface of 15,
The configuration of the other parts is the same as that of the conventional suspension 2. The adhesive tape 31 is formed by coating or integrally mixing a rubber-based, silicon-based, acrylic-based pressure-sensitive adhesive on a base material such as polyester or polyimide.

According to this embodiment, the leaf springs 12 and 15 of the suspension 2 can be given a damping effect by the action of the adhesive tape 31. In addition, the leaf spring 12,
Since processing such as thinning of 15 can be performed by press processing before adhering the tape 31, the manufacturing cost can be reduced. Further, the leaf spring 1 of the adhesive tape 31
It is also possible to automate the bonding to 2, 15 and the assembly of the suspension 2.

[0012]

As described above, according to the biaxial actuator of the present invention, the suspension made of the leaf spring to which the tape with the adhesive is adhered is easy to manufacture and inexpensive. It can be used to delay the damping effect. It also enables automation of suspension assembly.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of a suspension of an embodiment of a biaxial actuator of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a perspective view showing a configuration of an example of an optical pickup to which an embodiment of the present invention is applied.

FIG. 4 is a plan view showing a configuration of a suspension according to an example of a conventional biaxial actuator.

5 is a side view of FIG.

FIG. 6 is a vertical cross-sectional view showing the configuration of an example of a conventional spring plate.

[Explanation of symbols]

 2 Suspension 3 Optical pickup 5 Objective lens 12,15 Leaf spring 31 Tape with adhesive

Claims (1)

[Claims] 1. A biaxial actuator having a suspension for movably supporting an objective lens portion of an optical pickup vertically and horizontally, and adhering the suspension to a biaxial actuator for performing focus adjustment and tracking adjustment of the optical pickup via the suspension. A biaxial actuator comprising a leaf spring to which an adhesive tape is adhered.