JP2001351257A - Drive device for optical system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability for assembling an optical system device. SOLUTION: A fixing member 4 is provided with an iron made actuator base 10 to which a magnet 9 is fixed, a first spring holder 11 which is superposed on the actuator base 10 and also has a surface in which the other ends of wires 3a, 3b are arranged, a second spring holder 12 having a first surface which is superposed on the surface of the first spring holder 11 and a second surface in which the other ends of wires 3c, 3d are arranged, and a third spring holder 13, having a surface which is superposed on the second surface of a second arranging member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to information recording and / or
Also, the present invention relates to an optical system driving device provided in an optical recording / reproducing device that performs reproduction optically.

[0002]

2. Description of the Related Art In such an optical system driving device, a holding member for holding a lens, a conductive elastic member (a wire, a suspension or the like) having one end fixed to the holding member, and the holding member are movable. Fixing members for fixing the other ends of the first to fourth conductive elastic members as described above, for example,
JP-A-5-217175 and JP-A-8-2638
No. 65 is described.

The optical system driving device described in the above-mentioned Japanese Patent Application Laid-Open No. 5-217175 has a fixing member in which a groove for fixing one end of a wire is formed vertically. in this case,
In order to fix one end of the wire to the fixing member, one end of the wire is set in a corresponding groove, and is clamped.

On the other hand, Japanese Unexamined Patent Publication No.
The optical system driving device described in Japanese Patent Application Laid-Open No. 5 (1999) -2005 has a base as a fixing member in which a groove for fixing one end of a suspension is formed up and down. In this case, the fixing of one end of the suspension to the corresponding groove of the base is performed by an adhesive.

[0005]

However, in the optical system driving device described in JP-A-5-217175, grooves for fixing one end of the wire are formed above and below the fixing member. When setting the wire from above the fixing member, it is necessary to turn the fixing member upside down during assembly, and the workability of assembling the device is not good. If the wire is set by any other method, the work becomes complicated, and as a result, the workability of assembling the device is deteriorated. In addition, the wires arranged in the upper and lower grooves of the fixing member are fixed by a common wire holder, but in this case, a jig or the like is required to hold the wires during the work, and the workability of assembling the device is increased. Becomes worse.

In the optical system driving device described in Japanese Patent Application Laid-Open No. 8-263865, grooves for fixing one end of the suspension are formed above and below the base, so that the workability of assembling the device is not good.

An object of the present invention is to provide an optical system driving device having good workability in assembly.

[0008]

According to the first aspect of the present invention, there is provided an optical system driving apparatus comprising: a holding member for holding a lens;
A first-fourth conductive elastic member having one end fixed to the holding member, and a fixing member fixing the other end of the first-fourth conductive elastic member such that the holding member is movable. A first arrangement member having a surface on which the other ends of the first and second conductive elastic members are arranged, and a first arrangement member superimposed on the surface of the first arrangement member.
And a second arrangement member having a second surface on which the other ends of the third and fourth conductive elastic members are arranged.

According to the optical system driving device of the first aspect,
At the time of assembling the device, it is only necessary to sequentially arrange the first arrangement member, the first and second conductive elastic members, the second arrangement member, and the third and fourth conductive elastic members. The device can be assembled from one side of the device, and as a result, the workability of device assembly is improved.

According to a second aspect of the present invention, the optical system driving device is characterized in that the fixing member further includes a third arrangement member having a surface overlapping with the second surface of the second arrangement member. Things. Also in this case, since it is only necessary to arrange the third and fourth conductive elastic members next to each other, the workability of assembling the device is improved.

According to a third aspect of the present invention, in the optical system driving device, the space for filling the damping gel is formed by the adjacently disposed members and the conductive elastic member existing between the disposed members. It is characterized by the following. Since such a space can be formed only by arranging the arrangement member and the conductive elastic member in this order, it is possible to obtain good damping characteristics while maintaining good workability in assembling the device.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical system driving device according to the present invention will be described in detail with reference to the drawings. FIG.
FIG. 2 is a perspective view of a first embodiment of the optical system driving device according to the present invention, and FIG.
FIG. 3 is an exploded perspective view of the embodiment.

In such an optical system driving device, a holding member 2 for holding the lens 1, four wires 3a to 3d each having one end fixed to the holding member 2, and the holding member 2 can be moved. And fixing members 4 for fixing the other ends of the wires 3a to 3d as described above.

The holding member 2 includes a lens holder 5 to which the lens 1 is fixed, and a bobbin 8 fixed to the lens holder 5 and having a driving focus coil 6 and tracking coils 7a and 7.

The wires 3a-3d are, for example, 0.1 mm in diameter.
It is a beryllium copper wire of 0 mm. The fixing member 4
An iron actuator base 10 to which a magnet 9 is fixed;
A first spring receiver 11 having a surface superposed on the actuator base 10 and having the other end of the wires 3a and 3b disposed thereon; a first surface and wires 3c and 3c superposed on the surface of the first spring receiver 11; The second spring member 12 includes a second spring receiver 12 having a second surface on which the other end of the 3d is disposed, and a third spring receiver 13 having a surface overlapped with the second surface of the second arrangement member.

With such a configuration, the lens holder 5
Are perpendicular to the surface of an optically recordable and / or reproducible disc-shaped medium (for example, an optical disk) (not shown) by four wires 3a to 3d (Z direction in a three-dimensional coordinate system) and It is movably supported in the radial direction (X direction).

The focus coil 6 is wound around a bobbin 8, and tracking coils 7a and 7b are fixed thereto. Here, instead of fixing the focus coil 6 directly to the lens holder 5 as an air-core coil, by winding the bobbin 8, it is possible to prevent the deformation of the focus coil 6 from interfering with the inner magnet 9. .

At both ends of the bobbin 8, reference pins 8a and 8b for positioning are provided, and receiving portions 5a and 5b of the lens holder 5 are provided.
b, the displacement of the magnet 9, the focus coil 6, and the tracking coils 7a and 7b can be minimized.

The four wires 3a-3d are shown in FIGS.
As shown in (1), they are sandwiched and fixed by the first to third spring supports 11-13. Specifically, the wire 3
a and 3b are inserted into the grooves 14 for fixing the wires of the lens holder 5.
a, 14b and a groove 11 for fixing the wire of the first spring receiver 11
grooves 11a and 11b in a state where
An adhesive is applied to the second spring support 1 on the first spring support 11.
Place 2. As a result, the wires 3a and 3b
It is fixed by the spring support 11 and the second spring support 12.

Next, the wires 3c and 3d are adhered to the grooves 12a and 12b in a state where the wires 3c and 3d are arranged in the grooves 14c and 14d for fixing the wires of the lens holder 5 and the grooves 12a and 12b for fixing the wires of the second spring receiver 12, respectively. The agent is applied, and the third spring support 13 is placed on the second spring support 12. Thus, the wires 3c and 3d are fixed by the second spring bearing 12 and the third spring bearing 13.

Before arranging the wires 3a-3d, the grooves 11
An adhesive can be applied to each of a, 11b, 12a, and 12b. As the adhesive for the grooves 11a, 11b, 12a, and 12b, a material having the property of ultraviolet curing and heat curing is used, and the portion where the adhesive protrudes is quickly cured by irradiating the ultraviolet, and the portion where the ultraviolet cannot be irradiated. Is cured by heating. As an adhesive,
Those having the properties of ultraviolet curing and anaerobic curing can also be used.

The first spring support 11 is a reference pin 1 for accurately positioning the second spring support 12 and the third spring support 13.
3a and 13b. The second spring support 12 is provided with the reference pin 1.
It has a reference hole 15a into which the reference hole 3a is inserted, and an elongated hole 15b into which the reference pin 13b for absorbing an error in the interval is inserted. Similarly, the third spring support 13 has a reference hole 16a into which the reference pin 13a is to be inserted, and an elongated hole 16b into which the reference pin 13b is to be inserted to absorb a gap error. Accurate positioning can be performed by fitting the reference pins 13a, 13b into the reference holes 15a, 16a and the elongated holes 15b, 16b, respectively.

In this manner, the first to third spring supports 11-1 are provided.
3 is fixed, a space 17 is formed around the wires 3a-3d.
a-17d are formed (the spaces 17a, 1 in FIG. 5 are formed).
Only 7c is shown. ). Each of these spaces 17a to 17d is filled with a gel (for example, silicon gel) 18. Space 1
Since 7a-17d is surrounded by one of the first or third spring receiver 11 or 13, the second spring receiver 12, and one of the wires 3a-3d, there is no possibility that the filled gel 18 flows out. As a result, a damping effect can be reliably obtained.

The space 17a, 17b is filled with silicon 18 through filling holes 19a, 19b (only 19a is shown in FIG. 1) formed by the first and second spring supports 11 and 12, and the spaces 17c, 17d. Silicon 18 to
Is filled with the filling holes 19c,
Start from 19d.

The holding member 2 and the first to third spring supports 11-13 to which the wires 3a to 3d are fixed are fixed to the actuator base 10. The actuator base 10 has reference holes 20a and 20b (only the reference hole 20a is shown in FIG. 2), and the reference holes 20a and 20b have the first holes.
The reference pins 21a and 21b of the spring receiver 11 are fitted respectively, and the holding member 2 and the first to third spring receivers 11 to 13 are mounted at accurate positions.

In order to fix the wires 3a to 3d to the holding member 2, that is, the lens holder 5, one ends of the wires 3a to 3d are placed on the grooved projections 21a to 21d of the lens holder 5, respectively. Is applied to the protrusions 21a to 21d, whereby the wires 3
a-3d are fixed to the projections 21a-21d, respectively.

In order to supply power from the focus coil 6 and the tracking coils 7a and 7b to the wires 3a to 3d, four grooves 22a-2 formed in the lens holder 5 are provided.
2d (only the grooves 22a, 22c, and 22d are shown in FIG. 1), the ends of the winding start and end of each coil are taken out, and tangled and soldered to the protrusions 21a to 21d for each wire.

For the entanglement, the ends of the ends of each coil are plated with solder (preliminary soldering), and the wires 3a-3d are connected to the projections 21a-
Each is wound one or more times around 21d and soldered. In this manner, the projections 21a to 21d are entangled with the wires 3a to 3d, thereby preventing the tip of the wires 3a to 3d from generating resonance due to soldering.

The lens holder 12 is made of two kinds of LCP (liquid crystal polymer) having high heat resistance, and the operation is performed quickly, so that there is no possibility that the lens holder 12 is melted. Further, by forming each coil with a copper wire, disconnection of the pre-soldered portion is prevented.

In order that the first to third spring supports 11-13 can be pressed by a jig when the wires 3a to 3d are bonded, the top shape of the second spring support 12 is set as shown in FIG. The jig pressing portion 22 of the spring receiver 11 is secured, so that the wires 3a to 3d can be fixed more accurately.

The operation of the thus configured optical system driving device will be described. Laser light emitted from an optical system (not shown) is reflected by a mirror (not shown) arranged below the lens 1 and forms a spot on a medium (not shown) by the lens 1. Light reflected from the medium is again transmitted to the lens 1
And returned to the optical system via mirror, focus error,
A tracking error and a recording signal are detected. When a focus error and / or a tracking error is detected, the focus coil 6 is connected through the wires 3a to 3d.
The lens holder 5 is driven in a predetermined direction by passing a current through the tracking coils 7a and 7b. Thus, the lens 1 and the lens holder 5 having the same
Is subjected to focus control and tracking control.

In the present embodiment, the first to third spring supports 11
By using -13, the wire fixing operation can be simplified as compared with a conventional optical system driving device using a single spring receiver.

When a single spring receiver is used, the bonding operation is performed after the wire is passed through a hole having substantially the same diameter as the wire.
For example, in the case of a wire made of beryllium copper having a diameter of 0.10 mm, it is necessary to pass the wire through a hole having a diameter of 0.11 to 0.15 mm. At that time, the wire may hit the spring receiver, and the wire may be bent. Such a bent wire is naturally a defective product. In addition, it is very difficult to pass a wire through a hole having a diameter of 0.11 to 0.15 mm, and the operation requires skill. However, in this embodiment, there is no need to pass the wire through the hole,
That is, the wires 3a-3d are connected to the first and second spring receivers 1.
It suffices to place them on the first and the second, and as a result, the work is simplified, so that good workability is obtained.

Also, the wires 3a, 3
After placing the second b, the second spring receiver 12 is placed and the second
After placing the wires 3c and 3d on the spring support 12 of
Since the assembly method in which the spring receiver 13 is placed is not required, it is not necessary to turn the device upside down during the assembly, so that the workability is improved, and there is no possibility that the wire is bent during the operation of turning the device upside down. In addition, since the operation for fixing the next two wires 3c and 3d is started after the two wires 3a and 3b are securely fixed, there is no possibility that the wires are displaced during the operation, and assembling a high-precision device. Will be able to

FIG. 7 is a perspective view of a second embodiment of the optical system driving device according to the present invention. In the present embodiment, the leaf springs 31a to 31d are used instead of the wires, and accordingly, the first to third spring supports 32-34 and the lens holder 35 are used.
Are partially modified.

The tip 36a-3 of the leaf springs 31a-31d
6d (only the tip portions 36a, 36c and 36d are shown in FIG. 7) has a shape such that a coil can be tied and soldered as shown in FIG. Groove 32 of first spring receiver 32
a, 32b, grooves 33a, 33b of the second spring receiver 33 and grooves 35a, 35b, 35c, 35d of the lens holder 35.
(Only the grooves 35a, 35c and 35d are shown in FIG. 7.) Each has substantially the same width as that of the corresponding leaf spring 31a-31d so that the corresponding leaf spring 31a-31d can be arranged. Also,
The second spring support 33 and the third spring support 34 correspond to the corresponding grooves 32.
a, 32b, 33a, and 33b have protrusions to be fitted respectively.

The depth d of the grooves 32a, 32b and the thickness t of the leaf springs 31a, 31b are made substantially the same, the projection of the second spring receiver 33 is omitted, and the first spring receiver 32 and the second spring receiver 32 are omitted. The leaf springs 31a and 31b can be interposed between the spring support 33 and the spring support 33. Naturally, the depth of the grooves 33a, 33b and the leaf springs 31a, 31
It is also possible to make the thickness of 1b substantially the same, omit the protrusion of the third spring receiver 34, and sandwich the leaf springs 31c, 31d between the second spring receiver 33 and the third spring receiver 34.

According to the present embodiment, the grooves 32a, 32
b, 33a, 33b, 35a, 35b, 35c, 35d
Springs 31a, 31b, 31c,
31d can be fixed, so that the grooves 32a, 32
b, 33a, 33b, 35a, 35b, 35c, 35d
, And the manufacturing of the first to third spring supports 32-34 is simplified.

FIG. 10 is a perspective view of an optical system driving device according to a third embodiment of the present invention. In the present embodiment,
The third spring receiver 34 is omitted from the optical system driving device shown in FIG. 7, that is, only the first and second spring receivers 41 and 42 are provided. The leaf springs 43a and 43b are fixed in the same manner as in the second embodiment, and the leaf springs 43c and 43d are fixed.
Are fixed in the grooves 42a and 42b of the second spring receiver 42 by applying an adhesive.

In this case, by making the grooves 42a, 42b relatively deep and filling the grooves 42a, 42b with gel,
Almost the same damping effect as in the first and second embodiments can be obtained.

According to the present embodiment, the first and the second
The number of parts and the number of manufacturing steps are reduced as compared with the embodiment, and as a result, the optical system driving device can be configured at a low cost.

[0042]

According to the present invention, when assembling the optical system driving device, the first arrangement member, the first and second conductive elastic members, the second arrangement member, and the third and fourth conductive elastic members are combined. Since the devices need only be arranged in order, the device does not need to be turned over, and can be assembled from one side of the device. As a result, the workability of assembling the device is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of an optical system driving device according to the present invention.

FIG. 2 is an exploded perspective view of the optical system driving device of FIG.

FIG. 3 is an exploded perspective view of a fixing member of the optical system driving device in FIG.

FIG. 4 is a front view of a fixing member of the optical system driving device of FIG. 1;

FIG. 5 is a sectional view of the optical system driving device in FIG. 1;

FIG. 6 is a top view of the first and second spring supports of FIG. 1;

FIG. 7 is a perspective view of an optical system driving device according to a second embodiment of the present invention.

8 is a front view of a fixing member of the optical system driving device in FIG.

FIG. 9 is a partially enlarged front view of a fixing member of the optical system driving device of FIG. 7;

FIG. 10 is a perspective view of an optical system driving device according to a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lens 2 Holding member 3a, 3b, 3c, 3d Wire 4 Fixing member 5, 35 Lens holder 5a, 5b Receiving part 6 Focus coil 7a, 7b Tracking coil 8 Bobbin 8a, 8b, 13a, 13b, 21a, 21b Reference pin 9 Magnet 10 Actuator base 11, 32, 41 First spring support 11a, 11b, 12a, 12b, 14a, 14b, 1
4c, 14d, 22a, 22b, 22c, 22d, 32
a, 32b, 33a, 33b, 35a, 35b, 35
c, 35d, 42a, 42b Groove 12, 33, 42 Second spring support 13, 34 Third spring support 15a, 16a, 20a, 20b Reference hole 15b, 16b Slot 17a, 17b, 17c, 17d Space 18 Gel 19a, 19b, 19c, 19d Filling holes 21a, 21b, 21c, 21d Projecting portion 22 Jig holding portion 31a, 31b, 31c, 31d, 43a, 43b, 4
3c, 43d Leaf spring 36a, 36b, 36c, 36d Tip

Claims (3)

[Claims] 1. A holding member for holding a lens, first to fourth conductive elastic members each having one end fixed to the holding member, and the first to fourth conductive members so that the holding member is movable. A first arrangement member having a surface on which the other ends of the first and second conductive elastic members are arranged, the first arrangement member comprising: a fixing member for fixing the other ends of the conductive elastic members. An optical system drive comprising: a first arrangement member having a first surface superposed on one arrangement member surface and a second arrangement member on which the other ends of the third and fourth conductive elastic members are arranged. apparatus. 2. The optical system driving device according to claim 1, wherein the fixing member further includes a third arrangement member having a surface overlapping with the second surface of the second arrangement member. 3. The optical device according to claim 1, wherein a space for filling the gel for damping is formed by adjacently arranged members and a conductive elastic member existing between the arranged members. System drive.