JPH08329496A - Optical head - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an optical head capable of effectively suppressing vibration. An objective lens 2, a lens holder 3 for holding the objective lens 2, one end fixed to the lens holder 3, and a wire 4 for elastically supporting the lens holder 3
In the optical head 1 including the lens holder 3, the lens holder 3 has a fixing portion 31 that is a portion to which one end of the wire 4 is fixed, and a receiving portion 32 that receives one end of the wire 4, and in the receiving portion 32. This wire 4 is engaged with one end of the wire 4
The vibration damping member 5 for damping the vibration is disposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head which is a component of an optical pickup device provided in an optical disk drive device, and more particularly to an optical head having a vibration damping structure.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view of a conventional optical head.
Referring to FIG. 4, the conventional optical head 1 includes an objective lens 2
A lens holder 3 for holding the objective lens 2, and a wire 4 having one end fixed to the lens holder 3 and elastically supporting the lens holder 3.

In the case of the conventional optical head, one end of the wire 4 is soldered to the substrate 9 and then the substrate 9 is bonded to the lens holder 3 to fix the wire 4 to the lens holder 3.

A storage portion 30b is formed in the lens holder 3, and a focus coil 6 and a pair of tracking coils 7 are provided in the storage portion 30b. The lens holder 3 is elastically supported on the actuator base by the wire 4 by fixing the other end of the wire 4 to a wire fixing block (not shown) fixed on the actuator base (not shown). It Then, the above-mentioned objective lens 2, lens holder 3, wire 4, focus coil 6, tracking coil 7,
The actuator base, the wire fixing block, and the like form an optical head actuator that forms a part of the optical pickup device.

In this optical head actuator,
A voltage is applied to the focus coil and the tracking coil to excite these coils, and the magnetic force of these coils allows the optical head to move in the focus direction and the tracking direction. When the excitation of the focus coil and the tracking coil is stopped, the optical head returns to its original position by the elastic force of the wire (for example, see Japanese Patent Laid-Open No. 7-37261).

[0006]

As described above, in the conventional optical head, the lens holder is simply elastically supported by the wire and has no vibration damping structure. Therefore, when the optical head moves and stops there due to the magnetic force of the focus coil or tracking coil, or when the magnetic force of the focus coil or tracking coil disappears and the optical head returns to its original position, the optical head vibrates. This vibration is not immediately attenuated, which causes a problem that the track sheet time (the time from the movement and stop of the optical head until the alignment is possible) becomes long. Also,
As described above, since the optical head is simply elastically supported by the wire, the vibration of the portion other than the optical head actuator causes the optical head to resonate, which may hinder the control of the optical head actuator.

Therefore, an object of the present invention is to provide an optical head capable of effectively suppressing vibration.

[0008]

According to the present invention, an objective lens, a lens holder for holding the objective lens, and a wire having one end fixed to the lens holder and elastically supporting the lens holder are provided. In the optical head including the lens holder, the lens holder has a fixing part that is a part to which one end of the wire is fixed, and a receiving part that receives the one end of the wire, and the one end of the wire is engaged in the receiving part. An optical head is obtained in which a vibration damping member for damping the vibration of the wire is arranged.

[0009]

In the optical head of the present invention, the lens holder has the fixing portion and the receiving portion, and the wire has one end fixed to the fixing portion of the lens holder. The receiving portion of the lens holder receives one end of the wire fixed to the fixing portion and holds the vibration damping member. The damping member engages with the wire to damp the vibration of the wire. Therefore,
Even if the wire vibrates, the vibration damping member damps the vibration within a short time.

[0010]

1 is a perspective view of an optical head according to an embodiment of the present invention, FIG. 2 is a plan view of the optical head shown in FIG. 1, and FIG.
3 is a rear view of the optical head shown in FIG.

Referring to FIGS. 1 to 3, this optical head 1
Is an objective lens 2, a lens holder 3, a wire 4,
It has a vibration damping member 5.

In the case of this embodiment, the lens holder 3 comprises a lens holder body 30, a fixing portion 31, and a receiving portion 32.

The lens holder main body 30 has a planer shape of a substantially Japanese character, and its tip portion is a holding portion 30a.
And a rear part thereof is a storage portion 30b. The holding portion 30a is a portion that holds the objective lens 2. The storage portion 30b is a portion for storing the focus coil 6, the pair of tracking coils 7, a yoke portion formed on an actuator base (not shown), and the like.

The fixing portion 31 has a substantially rectangular parallelepiped shape and is provided on both side surfaces of the lens holder body 30 respectively.
It is formed integrally with 0. One ends of the wires 4 are fixed to the upper surface and the lower surface of these fixing portions 31, respectively.

The receiving portion 32 is composed of a plate-like portion 32a and a rod-like portion 32b, and is formed integrally with the lens holder body 30 and the fixing portion 31 on both side surfaces of the lens holder body 30, respectively. The plate-shaped portion 32a has a rectangular plate shape. The rod-shaped portion 32b has a rectangular rod shape, and is integrally formed with the lens holder body 30 on the side surface of the lens holder body 30 together with the plate portion 32a. These plate-like parts 3
The lens holder body 30 is formed by the 2a and the rod-shaped portion 32b.
Four spaces are formed between both side surfaces of the wire and the plate-shaped portion 32a, and one end of the wire 4 is received in each of these spaces.

The wire 4 is composed of a thin wire having elasticity. In this embodiment, there are four wires, one end of which is fixed to the fixing portion 31 of the lens holder 3. In a state where each wire 4 is fixed to the fixing portion 31, a portion near one end of each wire 4 is received in the receiving portion 32 of the lens holder 3, respectively.

In this embodiment, there are four damping members 5, and each damping member 5 is arranged in each of the four spaces defined by the receiving portion 32. These damping members 5 are
It is held by the receiving portion 32 and engages with one end of the wire 4 to damp the vibration of the wire 4. As the vibration damping member 5, a gel-like substance, rubber, silicon or the like is suitable.

In this embodiment, the receiving portion 32 is composed of the plate portion 32a and the rod-like portion 32b. However, the receiving portion 32 is not limited to this, and can be formed by a groove, a recess, a partition or the like formed in the lens holder. You may comprise a part. In the case of this embodiment,
Although the fixing portion 31 is provided so as to project from the side surface of the lens holder body 30, the fixing portion 31 does not necessarily have to be fixed in this way, and for example, a portion in the vicinity of the receiving portion may simply be the fixing portion.

[0019]

According to the optical head of the present invention, the damping member for damping the vibration of the wire is arranged in the receiving portion. Therefore, there is the vibration of the optical head when the optical head moves and stops there, or there is the optical head. The vibration of the optical head when returning from the position to the predetermined position can be immediately attenuated. Therefore, the optical head of the present invention can shorten the track sheet time. Further, resonance of the optical head due to external vibration can be prevented, and as a result, resonance that adversely affects control of the optical head actuator does not occur, so that the control of the optical head actuator can be performed reliably and accurately.

[Brief description of drawings]

FIG. 1 is a perspective view of an optical head according to an embodiment of the present invention.

FIG. 2 is a plan view of the optical head shown in FIG.

FIG. 3 is a rear view of the optical head shown in FIG.

FIG. 4 is a perspective view of an example of a conventional optical head.

[Explanation of symbols]

 1 Optical Head 2 Objective Lens 3 Lens Holder 4 Wire 5 Damping Member 6 Focus Coil 7 Tracking Coil 30 Lens Holder Body 31 Fixing Part 32 Receiving Part

Claims (2)

[Claims] 1. An objective lens, a lens holder for holding the objective lens, and one end fixed to the lens holder,
In an optical head including a wire for elastically supporting the lens holder, the lens holder has a fixing portion that is a portion to which one end of the wire is fixed, and a receiving portion that receives one end of the wire. An optical head, characterized in that a damping member that engages with one end of the wire to damp the vibration of the wire is disposed in the receiving portion. 2. The damping member is made of any one of gel-like substance, rubber and silicon.
The described optical head.