JPH08329495A - Optical head actuator - Google Patents

Abstract

PURPOSE: To provide an optical head actuator for which it is not necessary to fit a tracking coil to a lens holder. CONSTITUTION: A focusing coil receiving part 40 having a recessed groove is provided in the columnar surface of a lens holder 10' and a focusing coil 14 is wound along the focusing coil receiving part 40. First and second tracking coil winding frame parts 41 and 42 are projectingly provided in both ends of the first main surface 11 of the lens holder 10' in the winding direction of the focusing coil 14, first and second tracking coils 21 and 23 are wound around the parts 41 and 42. Third and fourth tracking coil winding frame parts are projectingly provided on both ends of the focusing coil 14 of the second main surface 12 of the lens holder 10' in the winding direction of the focusing coil 14 and a third tracking coil 23 and a fourth tracking coil are wound on these.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head actuator provided in an optical disk drive device.

[0002]

2. Description of the Related Art Referring to FIG. 3, a conventional optical head actuator has a columnar lens holder 10. Specifically, the lens holder 10 has a quadrangular prism shape. The columnar lens holder 10 has a columnar surface, and the first and second main surfaces 11 and 12 of the columnar surface face each other.
The objective lens holder 13 for pickup is held on one end surface of the lens holder 10. The focusing coil 14 is wound around the cylindrical surface of the lens holder 10 so as to be substantially orthogonal to the central axis of the lens holder 10. First and second tracking coils 21 and 22
Are attached to the focusing coil 14 at both ends of the first principal surface 11 in the winding direction of the focusing coil 14. That is, the first and second tracking coils 21 and 22 formed by winding in advance are resin-bonded. Similarly, the third and fourth tracking coils 23 and 24 are used for focusing coil 14 of second main surface 12.
Focusing coil 14 on both ends in the winding direction of
It is attached by resin bonding on top.

Referring to FIG. 4, another conventional optical head actuator has a columnar lens holder 10. In this case, the lens holder 10 has a hexagonal column shape. This columnar lens holder 10 also includes first and second main surfaces 11 and 12 facing each other as part of the columnar surface. The objective lens holder 13 is held on one end surface of the lens holder 10. The focusing coil 14 is wound around the cylindrical surface of the lens holder 10 so as to be substantially orthogonal to the central axis of the lens holder 10. The first and second tracking coils 21 and 22 are resin-bonded onto the focusing coil 14 at both ends of the first principal surface 11 in the winding direction of the focusing coil 14. Similarly,
The third and fourth tracking coils (not shown) are attached to the focusing coil 14 by resin bonding on both ends of the second principal surface 12 in the winding direction of the focusing coil 14.

This optical head actuator has an actuator base 30 that functions as a fixed base that supports the lens holder 4 so that it can be displaced in the vertical direction (that is, the focusing direction) and the horizontal direction (that is, the tracking direction). 2 on both sides of the lens holder 4
One end of each suspension wire 31 made of a wire material having elasticity is fixed and the suspension wires 3
The other end of 1 is fixed to the actuator base 30.

First and second magnets 33 and 34 are fixed to two inner surfaces of the yoke 32 having a concave cross section, which face each other. These first and second magnets 33
One end surface of the yoke 32 having a concave cross section is fixed to the actuator base 30 so that the first and second main surfaces 11 and 12 face each other.

The lens holder 4 is provided with holes 35 and 36 near the first and second main surfaces 11 and 12. Each of these holes 35 and 36 has a yoke 3
The yokes 37 and 38 connected to 2 are inserted.

In this structure, the driving device for displacing the lens holder 10 includes a focusing coil 14, first and second tracking coils 21 and 22, and third and fourth tracking coils which are formed in the lens holder 10. Coil (not shown) and actuator base 3
And a magnetism generating portion including first and second magnets 33 and 34. With this driving device, the lens holder 10 is moved in the up-down direction (that is, the focusing direction) and the left-right direction (that is, the actuator base 30).
It is configured to be displaceable in the tracking direction).

In the optical head actuator shown in FIG. 3, the actuator base 30, the suspension wire 31, the yoke 32, the first and second magnets 33 and 34, in practice, as in the optical head actuator shown in FIG. Although the holes 35 and 36 and the yokes 37 and 38 are provided, they are not shown in FIG. 3 for the sake of simplifying the description.

[0009]

In the optical head actuator shown in FIGS. 3 and 4, as described above,
Only the focusing coil 14 is wound around the lens holder 10, and the first to fourth tracking coils 21 to 24 are formed in separate steps, and the first to fourth tracking coils 21 formed by these windings are formed. Nos. 24 to 24 are resin-bonded to a predetermined portion on the focusing coil 14, and a bonding or sticking step is required, and there is a drawback that workability during manufacturing is poor.

Therefore, it is an object of the present invention to provide an optical head actuator having improved workability in manufacturing.

Another object of the present invention is to provide an optical head actuator which does not require a separately prepared tracking coil to be attached to a lens holder.

[0012]

According to the present invention, a columnar lens holder having a columnar surface, and first and second main surfaces of the columnar surface facing each other, and this lens are provided. A lens for pickup held on one end surface of the holder, and a focusing coil wound around the pillar surface of the lens holder so as to be substantially orthogonal to the central axis of the lens holder,
First and second tracking coils are provided on both ends of the first main surface in the winding direction of the focusing coil, and are provided on both ends of the second main surface in the winding direction of the focusing coil. Third and fourth
In the optical head actuator having a tracking coil, the lens holder is provided on the pillar surface of the lens holder, and the focusing coil receiver is formed by a concave groove extending in a direction substantially orthogonal to a central axis of the lens holder. The focusing coil is wound along the focusing coil receiving portion, and the lens holder is further provided on both ends of the first main surface in the winding direction of the focusing coil. First done
And a second tracking coil winding frame portion, and third and fourth tracking coil winding frame portions projecting from both ends of the second main surface in the winding direction of the focusing coil. The first, second, third, and fourth tracking coils are wound around the first, second, third, and fourth tracking coil winding frame parts. An optical head actuator is obtained.

Further, according to the present invention, each of the first and second tracking coil winding frame portions is provided on the first main surface so as to sandwich the focusing coil receiving portion. A pair of winding frame elements, and each of the third and fourth tracking coil winding frame portions is a pair protruding from the second main surface with the focusing coil receiving portion sandwiched therebetween. An optical head actuator is obtained which has the reel element of

[0014]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a columnar lens holder 10 used in an optical head actuator according to an embodiment of the present invention.
It is shown. FIG. 2 shows this columnar lens holder 1
An optical head actuator according to an embodiment of the present invention using 0'is shown.

In FIG. 1, this columnar lens holder 1
Similarly to the lens holder 10 shown in FIGS. 3 and 4, 0 ′ also has a pillar surface, and the first and second main surfaces 1 of the pillar surface 1
1 and 12 face each other. This lens holder 19
The objective lens 13 is held on one end surface of the ′. A focusing coil receiving portion 40 formed of a concave groove extending in a direction substantially orthogonal to the central axis of the lens holder 10 'is provided on the pillar surface of the lens holder 10'.

As shown in FIG. 2, the focusing coil 14 is wound around the focusing coil receiving portion 40.

1 and 2, the lens holder 10
The first and second tracking coil winding frame parts 41 and 42 are provided at both ends of the first principal surface 11 of the ‘′ in the winding direction of the focusing coil 14. Further, at both ends of the second principal surface 12 of the lens holder 10 'in the winding direction of the focusing coil 14, a third tracking coil winding frame portion 43 and a fourth tracking coil winding frame portion (not shown) are provided. Is projected. As shown in FIG. 2, the first, second, and third tracking coil bobbin portions 41, 42, and 43, and the fourth tracking coil bobbin portion have the first, second, and third tracking coils. Coil 2
1, 22, and 23 and a fourth tracking coil (not shown in FIG. 2; fourth tracking coil 24 in FIG. 3).
Equivalent to. ) Is wound.

As shown in FIGS. 1 and 2, the first and second
Each of the tracking coil winding frame parts 41 and 42 has a pair of winding frame elements projectingly provided on the first main surface 11 of the lens holder 10 ′ with the focusing coil receiving part 40 interposed therebetween. Similarly, each of the third tracking coil winding frame part 43 and the fourth tracking coil winding frame part is also provided on the second main surface 12 of the lens holder 10 ′ with the focusing coil receiving part 40 interposed therebetween. It has a pair of projecting reel elements.

In the optical head actuator shown in FIG. 2, the actuator base 30, the suspension wire 31, the yoke 32, the first and second magnets 33 and 34, and the optical head actuator shown in FIG. Although the holes 35 and 36 and the yokes 37 and 38 are provided, these are not shown in FIGS. 1 and 2 for simplification of description.

[0021]

As described above, according to the present invention, there is no need to attach or adhere a separately prepared tracking coil to a lens holder, and an optical head actuator with improved workability in manufacturing is provided. Obtainable.

[Brief description of drawings]

FIG. 1 is a perspective view of a columnar lens holder used in an optical head actuator according to an embodiment of the present invention.

2 is a perspective view of an optical head actuator according to an embodiment of the present invention, which uses the columnar lens holder of FIG. 1. FIG.

FIG. 3 is a perspective view of a conventional optical head actuator.

FIG. 4 is a perspective view of another conventional optical head actuator.

[Explanation of symbols]

 10 Lens Holder 10 ′ Lens Holder 11 First Main Surface 12 Second Main Surface 13 Objective Lens 14 Focusing Coil 21 First Tracking Coil 22 Second Tracking Coil 23 Third Tracking Coil 24 Fourth Tracking Coil 40 Focusing coil receiving portion 41 First tracking coil winding frame portion 42 Second tracking coil winding frame portion 43 Third tracking coil winding frame portion

Claims (2)

[Claims] 1. A pillar-shaped lens holder having a pillar surface, and first and second main surfaces of the pillar surface facing each other, and a pickup held on one end surface of the lens holder. Lens, a focusing coil wound around the pillar surface of the lens holder so as to be substantially orthogonal to the central axis of the lens holder, and both ends of the first main surface in the winding direction of the focusing coil. First provided in the section
And an optical head actuator having a second tracking coil and third and fourth tracking coils provided on both ends of the second main surface in the winding direction of the focusing coil, wherein the lens holder includes: The focusing coil receiving portion is provided on the pillar surface of the lens holder and includes a concave groove extending in a direction substantially orthogonal to the central axis of the lens holder, and the focusing coil is provided along the focusing coil receiving portion. The lens holder is further wound, and the lens holder further includes first and second tracking coil winding frame portions projecting from both ends of the focusing coil in the winding direction of the focusing coil, and the first and second tracking coil winding frame portions. Third and fourth tracking coils provided on both ends of the main surface of the focusing coil in the winding direction of the focusing coil. A winding frame portion, and the first, second, third, and fourth tracking coil winding frame portions include the first, second, third, and fourth tracking coils. An optical head actuator, characterized in that the optical head is wound. 2. A pair of winding element elements projectingly provided on the first main surface in a state where each of the first and second tracking coil winding frame portions sandwiches the focusing coil receiving portion. And each of the third and fourth tracking coil winding frame parts includes a pair of winding frame elements projectingly provided on the second main surface with the focusing coil receiving part interposed therebetween. Claim 1 characterized by having.
The optical head actuator described in 1.