JPH06314432A - Optical system supporting device - Google Patents

Abstract

PURPOSE:To provide the optical system supporting device which is small in size, light in weight and excellent in control characteristic. CONSTITUTION:This optical system supporting device is constituted to support a holding member for supporting an optical element, such as objective lens via a supporting member in such a manner that this holding member is displaced in a prescribed direction. A leaf spring-like supporting spring 9 is used as the supporting member described above and a gelatinous damping material 10 is applied thereon. A clearance 9m between a slender spring end 9a and projecting parts 9b, 9c is narrowed to the extent that the gelatinous damping material is not made to flow outward by surface tension. The flanks of the optical system supporting device 9b are provided with wall parts 9p. There is no need for providing the holding member, fixing member, etc., with structures for holding the damping material. The optical system supporting device which is small in size and has the stable control characteristic is obtd. at a low cost. The size and weight of the optical pickup are thus reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supports an optical system supporting device, particularly an optical system such as an objective lens for projecting a light spot on an information recording medium in an optical information recording and / or reproducing device such as an optical disk. The present invention relates to a supporting device suitable for.

[0002]

2. Description of the Related Art Conventionally, in an optical system supporting device such as an objective lens for irradiating a light spot on a recording medium, a damping means is added to the supporting mechanism for stable control so as to suppress unnecessary resonance. I am trying.

As one of the damping means, there is a gel-like damping material. When applying a gel damping material instead of a rubber damping material to the end of a wire that is generally used as a supporting member of an optical system supporting device, the end of a linear wire spring is used. If the gel-like damping material is simply applied to the parts, the damping material may sag, and this may cause variations in the characteristics. Then, as a conventional example in which a gel filling and holding member is provided, Japanese Patent Laid-Open No. 2-232824 (Reference 1) discloses the following configuration.

In FIGS. 13A and 13B showing the conventional structure, the objective lens 101 is fixed to the lens holder 102. Four metal wires 103 arranged in parallel are soldered to the base substrate 105 fixed to the base 104 and the holder substrate 106 fixed to the lens holder 102 at both ends with solder 107. As a result, the lens holder 102 is supported in a cantilever manner. The damper case 108 has two holes and forms a fixed portion side together with the base 104. Gel damping material 109
(Thermoplastic or UV curable silicone-based gel) is configured to be filled and held in the hole of the damper case 108, and a pin 102a formed in a part of the lens holder 102 in the damping material 109 thereof. Has been inserted.

Further, the above document 1 also discloses the configuration shown in FIGS. 14A and 14B. This one also uses a container-shaped structure to hold the gel-like damping material, and the gel-like damping material 109 is filled and held in the container-like structure formed in a part of the lens holder 102. The wire 103 penetrates this. Also, the base 104
Gel-like damping material 1 on the container-like structure formed in a part of
09 is filled and held, and the wire 103 is passed through this.

Further, as a damping means for the supporting member of the optical system supporting device, there is an example in which rubber or the like is used in addition to the one using a gel-like damping material.
It is known from Japanese Patent Publication No. 6 (reference 2) and the like. The damping means of the support member in the publication is a case where a leaf spring structure as shown in FIG. 15 is used. Leaf spring 201
Is formed to have a thickness of about 0.1 mm, and fixing portions 202 and 203 are provided in the vicinity of both ends of the main body which is substantially linear as a whole, and the fixing portions 202 and 203 are provided near the both ends. Positioning holes 204 and 205 are formed. The projections 206 and 207 on both ends are soldered with the focus coil, the terminal of the tracking coil, the FPC for power supply, etc. to supply power.

A spring portion 208 is formed at the center of one of the fixing portions 203 in the extending direction of the leaf spring 201, and projections 209 projecting in the extending direction of the leaf spring 201 are formed on both sides of the spring portion 208. A protrusion 210 is formed at the tip of the protrusion so as to protrude in a direction orthogonal to the extending direction of the leaf spring 201. The leaf spring 20 is provided on the other side of the fixed portion 204 in the extending direction of the leaf spring 201.
The support portion 211 is formed to be narrow in the extending direction. The support portion 211 and the protrusion 210 are connected by a long spring portion 212 so that the entire leaf spring 201 together with the spring portion 208 is deformed in the focus direction and the tracking direction.

A spring portion 20 continuous with one fixed portion 203
8, almost the entire vicinity of the protrusion 209 and the protrusion 210,
A damper material 213 made of butyl rubber is attached to almost the entire vicinity of the support portion 211 continuous to the other fixed portion 204 and the entire long spring portion 212.
The damper material 213 has a narrow width at a portion corresponding to the long spring portion 212.

[0009]

However, in the optical information recording / reproducing apparatus, downsizing and speeding up are one of the important factors for realizing high performance, and for that purpose, the optical system supporting the optical system is used. It is desired to further reduce the size and weight of the device. FIG. 13 and FIG.
In the case of the configuration of 4, the container-like structure is required to hold the gel-like damping material. This is a holding member,
Alternatively, when it is provided on the fixed member, the member becomes large. Further, when the damping material holding member is provided as a separate part, the number of parts increases and the optical system supporting device becomes large. Therefore, in the configuration of the conventional example, the optical system supporting device or the movable part of the device becomes large,
This hinders the reduction in size and weight of the device.

Further, in the example of the above-mentioned document 2,
Generally, the rubber damping material is formed integrally with the support member using a mold. On the other hand, the gel-like damping material is fixed by potting the damping material on a corresponding portion of the support member and then irradiating it with ultraviolet rays or applying heat to cure it. Therefore, if it is intended to apply a gel damping material to the support member of the above example, it will be applied to the leaf spring as shown in FIG. 15, but if the damping material is applied on the leaf spring, However, the damping material may flow out to the peripheral portion of the leaf spring and spread thinly, so that the required characteristics may not be obtained. Further, Document 2 does not particularly take into consideration the distance between the protrusions of the spring portion.

Further, if it is desired to use a support member that uses an inexpensive wire wire instead of the leaf spring, there is no need to provide a container-like structure as in Document 1, and the end of the spring is simply gel-like. When the damping material is applied, stable characteristics cannot be obtained because the damping material flows. In the prior art, a wire support is used as a supporting member, and a gel-like damping material is used as a damper material, so that an optical system supporting device having an appropriate configuration can be obtained in terms of control characteristics, size reduction, and weight reduction. That also
It's extremely difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical system supporting device which can solve the above problems and which is small and lightweight and has excellent control characteristics.

[0013]

An optical system supporting device of the present invention comprises an optical element, a holding member for holding the optical element,
A support member that supports the holding member so that it can be displaced,
In an optical system supporting device including a driving means for driving the holding member in a predetermined direction, a holding portion for holding a gel damping material is provided at at least one position of the supporting member, and the gel damping material is arranged there. It is characterized by doing so.

[0014]

According to the present invention, in the optical system supporting device for supporting the holding member for supporting the optical element such as the objective lens so as to be displaceable in the predetermined direction through the supporting member, a gel-like damping is applied to the supporting member. A material holding portion is provided, and a gel damping material is provided therein. By doing so, it is not necessary to provide a structure for holding the damping material on the holding member, the fixing member, etc., so that a stable and controllable characteristic can be obtained with a compact and inexpensive structure, and accordingly, the compact size of the optical pickup can be obtained. Also, weight reduction makes this easy.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention,
FIG. 1 is a perspective view of the entire optical system supporting device, FIG. 2 is a coil connection explanatory view, and FIG. 3 is a detailed view of a spring end portion. In FIG. 1, reference numeral 1 denotes an objective lens for irradiating a light spot on an information recording medium in an optical information recording / reproducing apparatus. The objective lens 1 is fixed to the upper surface of a holding member 4 that holds the objective lens 1. In the present example, the focus coil 2 and the tracking coil 3 are bonded and fixed to the holding member 4 on both side surfaces on both sides in the tangential direction (Y). In this example, the holding member 4 also has spring fixing portions 4a on the upper and lower sides on both side surfaces on both sides in the tracking direction (X).

The base 5 is formed by molding sheet metal or resin. An outer yoke 6a formed by bending a sheet metal and an inner yoke 6b are fixed on the base 5, and a magnet 7 is fixed inside the outer yoke 6a. Two magnetic circuits are arranged at positions symmetrical with respect to the objective lens 1 in the tangential direction (see FIG. 2). In this example, the means for driving the holding member 4 which holds the objective lens 1 which is an optical element is configured to include these magnetic circuit, focus coil 2 and tracking coil 3.

A fixing member 8 is fixed to the outside of one outer yoke 6a. The fixing member 8 has a spring fixing portion 8a at each of the four corners. In the present embodiment, in order to displaceably support the holding member 4, four plate-shaped springs 9 formed by pressing a metal plate (see FIG. 2).
Is used (the detailed configuration is explained in FIG. 3 below),
Each spring 9 has a fixed portion 4 a of the holding member 4 at one end thereof.
And the other end thereof is adhesively fixed to the fixing portion 8a of the fixing member 8, whereby the holding member 4 is cantilevered so as to be movable in the focus direction (Z) and the tracking direction (X). To support. The holding member 4 is supported so that the inner yoke 6b fixed to the base 5 is located in the hollow portion of the tracking coil 3 fixed to the side surface of the holding member 4.

The electrical connection and the like of the coil portion fixed to the holding member 4 are as shown in FIG. 2, for example. As shown in the drawing, the focus coil 2 is a coil of air core winding, and the tracking coil 3 is a coil of two continuous winding cores, which are respectively bonded and fixed to a holding member 4 as shown in FIG. . In the present embodiment, the terminals of the two focus coils 2 and the tracking coil 3 are soldered to the relay board 11 and connected in series. On the other hand, attach the tip of each spring 9 to the relay board 11
And is electrically connected to the optical system supporting device fixing portion side through the springs 9 of the four metal plates. By doing so, power can be supplied to the coils 2 and 3, and the objective lens 1 is driven to a predetermined position by utilizing the electromagnetic force generated by the magnetic circuit.

As described above, the spring 9 used to support the holding member 4 and to electrically connect the coils 2 and 3 with electricity.
The details of the end portion of the shape are as shown in FIG. The spring 9 is formed by pressing a metal plate of beryllium copper or the like, and has a thin beam shape over almost the entire length as shown in the schematic shape of FIGS. 1 and 2.

On the other hand, as shown in FIG. 3, beam-shaped spring end portions 9a are provided near the fixed portions at both ends thereof, and the spring end portions 9a are narrower in width than the central portion. On both sides of the spring end 9a, there are protrusions 9 protruding in the extending direction of the spring 9.
b is provided, and a protrusion 9c is provided near the protrusion 9b on the central spring 9 in a direction substantially perpendicular to the extending direction of the spring 9. Protrusions 9b on both sides protruding in the extending direction
As shown in the figure, each tip end of the projection 9c reaches a position beyond the formation portion of the projection 9c, and the tip of the projection 9c faces each inner side of the projection 9b. Has become. Further, as for the gap 9m of the bent shape (hook shape) which is formed between the spring end 9a and the projections 9b and 9c, a gel-like damping material will be described in advance as described later. When applied, the dimension is such that it does not flow out due to surface tension, for example, 0.
It is set so as to be narrowed to about 05 to 0.5 mm. Further, the outer side surfaces of the protruding portions 9b on both sides are bent as shown in the figure, whereby wall portions 9p are provided on the side surfaces of the protruding portion 9b.

In the present embodiment, each spring 9 is molded so as to have the above-mentioned shape, and then a gel-like damping material 10 which is hardened by ultraviolet rays or the like is applied to the end portion of the structure shown in FIG. , Cure. The four springs 9 thus obtained are used for the assembly and electrical connection as shown in FIGS.

Next, the operation of the damping operation and the like by the optical system supporting device in this embodiment will be described. In the optical information recording / reproducing apparatus having the optical system supporting device having the above-mentioned configuration, the optical information recording / reproducing apparatus is a light beam emitted from an optical unit (not shown) including a light emitting element such as an LD and a light receiving element. The holding member 4 of the optical system supporting device of FIG.
Information is read and written by projecting onto the surface of the recording medium through the upper objective lens 1.

In such recording / reproduction, as previously mentioned, the objective lens 1 is driven to a predetermined position during focus or tracking control by supplying power to the required coil through the spring 9, and at this time, the holding member 4 When the movable part of the device is displaced, the spring end 9a is deformed,
Along with this, the damping material 10 held as shown in FIG. 3 on the spring end 9a and the projections 9b, 9c is deformed to absorb the vibration energy. In addition, the spring 9 is twisted and deformed at the time of rolling resonance of the movable portion of the apparatus, but the deformation is enlarged by the protrusion 9c provided substantially at right angles to the extending direction of the spring 9, so that high damping is achieved against rolling resonance. The effect is obtained.

Here, in the optical system supporting device of the present embodiment having a holding portion for the damping material 10 provided on the spring end portion 9 and the gel damping material is applied to the holding portion, a plate-like shape is provided. Even if it is a spring material, the damping material 10 is properly held therein, and as a result, damping is better performed. It is not necessary to provide a structure for holding the gel damping material on the holding member 4, the fixing member 8 or the like. As described above, the gap 9m between the spring end 9a and the protrusions 9b and 9c is made narrow so that the gel-like damping material does not flow out due to the surface tension. Flows a little in the direction in which the spring 9 extends, but since the wall 9p is erected on the side surface of the protrusion 9b, most of it is retained and retained here. Therefore, as discussed above, it is possible to prevent the applied damping material from flowing out to the peripheral portion of the leaf spring and spreading thinly when the damping material is applied onto the leaf spring, and thus it is difficult to obtain desired characteristics. It is also avoided. The deformation of the spring 9 is shown in FIG.
Since it concentrates in the vicinity of the spring end portion 9a, the damping material flowing in the extending direction of the spring 9 does not significantly affect the characteristics. Therefore, according to this configuration, the primary resonance and other sub-resonance of the movable portion of the device are appropriately damped, and stable control characteristics can be obtained.

According to this embodiment, it is possible to obtain a suitable optical system supporting device for the objective lens 1 which has a stable control characteristic and which is compatible with a small and lightweight optical pickup. The holding member 4 and the fixing member 8 are not enlarged in order to hold the damping material, no special member is added, and therefore the number of parts is not increased, and the gel-like damping material 10 is appropriately provided. be able to. Therefore, stable control characteristics can be obtained, and further, the optical system supporting device and the movable portion of the device can be reduced in size and weight, and it is possible to easily meet the demands for miniaturization and high speed of the optical information recording / reproducing device. it can.

FIG. 4 shows a modification of the above embodiment (first embodiment). In this example, as shown in the same drawing, walls 9d and 9e are further provided on the both end portions of the spring 9. By adding the wall portions 9d and 9e in this way, it is possible to regulate the flow out of the gel in the extending direction of the spring 9 when the gel damping material is applied, and a better effect can be obtained. Also in this example, similarly to the above example, by providing a holding portion for the damping material 10 in the vicinity of the end of the spring 9 which is a supporting member, the member for holding the damping material is enlarged or a special member is added. It is possible to dispose the damping material on the support member without needing to do so, and therefore it is possible to realize an optical system support device that is small and lightweight and has excellent control characteristics.
The optical pickup can be reduced in size and weight, which leads to reduction in size and performance of the optical information recording / reproducing device.

FIG. 5 shows another embodiment (second embodiment) of the present invention. In this embodiment, an inexpensive metal wire is used for the support spring instead of the leaf spring as in the first embodiment, and FIG. 5 is an enlarged view of the vicinity of the spring fixed end. The wire-shaped spring 19 has a spring end portion 1 as shown.
The tip is bent in a J shape at the portion 9a. on the other hand,
As shown in FIG. 5, positioning bosses 14 are provided on the fixing portions 4a and 8a for fixing the springs of the holding member 4 and the fixing member 8 shown in FIG. 1, and the bent portions of the tips of the springs 19 are applied and fixed. .

The gel-like damping material 10 is applied between the spring end portion 19a and the projection portion 19b formed by bending the tip of the spring 19 and extending substantially parallel to the extending direction of the spring 19.
Here, the gap between the spring end portion 19a and the protrusion portion 19b is set such that the applied damping material does not flow out due to surface tension and is sandwiched between the spring end portion 19a and the protrusion portion 19b. For example, the width is preset to about 0.05 to 1 mm. The rest of the configuration is similar to that of the first embodiment.

In the optical system supporting device according to the present embodiment, when the movable part of the device is displaced, the damping material 10 sandwiched between the spring 19 and the protrusion 19b is deformed and vibrates as the spring end 19a is deformed. To suppress unnecessary resonance of the movable part of the device. Also in this embodiment using the wire-shaped spring material, the holding member 4 and the fixing member 8 do not have the conventional container-like structure for holding the gel-like damping material as shown in FIGS. It is understood that the optical system supporting device is small and lightweight, and according to the configuration of this embodiment, the optical system supporting device is realized by combining the wire and the gel damping material as the supporting member. According to this embodiment, similarly, a holding member or a fixing member for holding the damping material can be enlarged, or a gel-like damping material can be provided without adding a special member, so that stable control characteristics can be obtained. In addition, the size and weight of the optical system supporting device and the movable part of the device can be reduced, and since the spring material made of wire is used, the cost can be reduced.

Next, still another embodiment (third embodiment) of the present invention will be described with reference to FIGS. In this example, the electrical connection of the coil portion and the shape configuration of the spring are different from those of the first embodiment as follows, and the other points are the same as those of the first embodiment. The main part will be described below. First, regarding the electrical connection of the coil portion, FIG. 6 shows a mode of electrical connection of the coils 2 and 3 fixed to the holding member 4 in this embodiment. The focus coil 2 is composed of an air-core winding coil, and the tracking coil 3 is composed of two continuous-winding air-core coils. As in the first embodiment, the holding member 4 is used.
Adhesively fixed to each. Here, in this embodiment, as shown in FIGS. 6 and 7, two focus coils 2 and a tracking coil 3 are connected in parallel, and the terminals 2a and 3a of the coils 2 and 3 are the tip portions of the springs 9. Solder directly to (the tip of the holding member 4 side).

That is, FIG. 7 is a detailed view of the vicinity of the soldered portion where the spring tip is applied. The spring 9 is constructed so that a part of the tip portion thereof exceeds the holding member side fixing portion 4a.
At the tip edge of q, as shown, in the extending direction of the spring 9,
Two grooves 15 each having a width corresponding to the wire diameter of the used coil are provided. Each of the four springs 9 shown in FIG.
The groove 15 has such a groove 15. 2 for each spring 9
As shown in FIG. 7, terminals 2a, 2a and terminals 3a, 3a on each end side (one end side, the other end side) of the two focus coils 2 and 2 and the two tracking coils 3 are provided in the groove 15 of the book. The solder 16 is used for soldering.

In the first embodiment, the terminals of the coils are connected in series via the relay board 11, and such a connection can be made normally, but this embodiment requires this relay board. Since it does not, the number of parts can be reduced in this respect as well. Further, as shown in FIG. 7, two coil terminals (terminal 2a and terminal 2a or terminal 3a and terminal 3a) can be soldered at once and directly to the spring 9, and the number of soldering points can be reduced. Therefore, the work man-hour can be reduced. Further, since a space for attaching the relay board is not required, there is an advantage that the holding member 4 can be made smaller in size also from this point.

Next, FIG. 8 shows an enlarged view of the other spring end portion (end portion on the fixing member 9 side) in this embodiment. In this embodiment, the spring material is formed by etching or pressing a metal plate. However, an S-shaped bent portion as shown in FIG. 8 is formed near the end of the thin beam-shaped spring 9 over substantially the entire length. 9r is provided, and each bent portion 9r is provided with a protruding portion 9s that protrudes substantially parallel to the extending direction of the spring 9. Further, the side surface of the protruding portion 9s is bent as shown to form a wall portion 9p to provide a damping material holding portion. The gel-like damping material 10 is applied here. In the case of the present embodiment, when the movable part of the device is displaced, the damping material 10 sandwiched between the spring bent part 9r and the protrusion part 9s is deformed to absorb the vibration as the spring 9 is deformed, and the movable part of the device is unnecessary. Suppress resonance.

Even with the configuration of this embodiment as described above,
It is possible to increase the size of the holding member or the fixing member for holding the damping material, or to provide a gel-like damping material without adding a special member, so that stable control characteristics can be obtained and the optical system supporting device and The movable part of the device can be reduced in size and weight, a relay board is not required for electrical connection of the coil, and a soldering place and labor can be reduced, so that cost can be reduced.

FIG. 9 shows still another embodiment (fourth embodiment) of the present invention. This figure is a detailed view of the vicinity of the spring end portion in this example, and the tip of the spring 19 is the round hole 1 of the fixing portion 4a of the holding member 4.
It is adhesively fixed through 7. In this way, as shown in FIG. 9 by taking the configuration near the spring end portion on the holding member 4 side as an example, in the present embodiment, the wire-shaped spring 1 is used as the support spring.
9 is used, and round holes 17 are formed in the spring fixing portions 4a and 8a of both the holding member 4 and the fixing member 8, respectively. It is to be adhesively fixed through.

Further, in the vicinity of the ends of the four springs 19,
A bent portion 19e as shown in FIG. 9 is provided, and the gel-like damping material 10 is applied thereto. The inter-wire spacing at the bent portion 19e is also the same as that of the second wire formed by the wire-shaped spring material.
As mentioned in the example, the damping material is held therein so that it does not flow out. The rest of the configuration is similar to that of the first embodiment.

In the optical system support device according to this embodiment, when the movable part of the device is displaced, the bent part 19 of the spring 19 is moved.
e is deformed, and accordingly, the damping material 10 held on the bent portion 19e is deformed to absorb the vibration, and unnecessary resonance of the movable portion of the device can be suppressed. The effects of such a configuration are similar to those of the first embodiment and the like, and a compact and lightweight optical system supporting device having good control characteristics can be realized easily and inexpensively. When a wire-shaped spring material is used, this may be done.

Still another embodiment (fifth embodiment) of the present invention will be described with reference to FIGS. 10A and 10B. In this embodiment, as a support spring, FIG. 10A is an enlarged view of the end portion of the spring.
As shown in the B-B cross section of FIG. 9B, a coil spring 29 in which a metal wire is closely wound in a cylindrical shape is used, and
The space near the center of the coil spring 29 wound with the metal wire is filled with the gel damping material 10. In the present embodiment, four such structures are used to support the holding member 4. The adhesive fixing of the holding member 4 and the fixing member 8 to the spring fixing portions 4a and 8a may be the same as that of the fourth embodiment, for example. Other configurations may be similar to those of the first embodiment.

In the case of the optical system supporting apparatus according to this embodiment using the coil spring 29, when the movable portion of the apparatus is displaced, the damping material 10 in the coil spring 29 is deformed to absorb the vibration, and the movable portion of the apparatus is unnecessary. Resonance can be suppressed. Also in this embodiment, the same effect as that of the first embodiment can be obtained.

Next, still another embodiment (sixth embodiment) of the present invention will be described with reference to FIGS. FIG. 11 shows the overall configuration of the optical system supporting device according to the present embodiment.
2 is an enlarged view of the vicinity of the spring end portion. Since the overall basic structure of the device is the same as that of the first embodiment, the same reference numerals are given to the same components in FIG. The main differences will be described below.

In this embodiment, the support spring is a spring 39 formed by press-molding two springs, as shown in FIG. That is, in the case of each of the above-described embodiments, a total of four support springs are used, but in this example, two springs 39 are used. As shown in FIG. 12, the spring 39 is configured to be reinforced by bending the side surface of the central portion of the beam-shaped portion 39h at the center thereof. Also, this beam-shaped portion 39h
Only the both ends 39g of the
1) in the Z direction). This is realized, for example, by appropriately setting a cut portion or the like.

The displacement in the tracking direction (X direction in FIG. 11) is performed at the root portion 39i of the beam-shaped portion 39h.
A part of the beam-like portion 39h is cut out, and a slit is provided in the end portion main body portion 39n. Further, as shown in FIG. 12, by bending a part of the leaf spring itself near the end of the spring,
The holding portions for the damping material indicated by the reference numeral 39j are formed, and the portions 39j and the end portions 39g of the beam-shaped portions are formed.
The gel-shaped damping material 10 is surrounded by the box by the
To fill. As a result, the gel damping material 10 is surrounded by the bent portion of the spring 39 and the like in almost five directions including the end body portion 39n. Therefore, when filling the damping material, for example, if the gel damping material is applied with the arrow A direction in FIG. 12 facing upward, the gel damping material is prevented from flowing out, and the gel damping material is made uniform in thickness. The damping material 10 can be appropriately arranged on the spring 39 side of the two-piece type. Spring 39
Also, a fixing hole 18 is formed in the end body portion 39n. In this embodiment, the fixing projections 4b and 8b of the holding member 4 and the fixing member 8 are aligned with each other so that the holding member 4 and the fixing member 8 are bonded and fixed.

In this embodiment, when the movable part supported by the two springs 39, 39 is displaced, the damping material 10 filled between the springs is deformed to absorb the vibration, which is unnecessary. Resonance can be suppressed. Also in this case,
The holding member 4 and the fixing member 8 do not have a conventional container-like structure for holding the gel-like damping material. Also with the configuration of the present embodiment as described above, it is possible to provide the damping member without enlarging the holding member 4 and the fixing member 8 or adding a special member. Therefore, stable control characteristics can be obtained, and the optical system supporting device and the movable part of the device can be made smaller and lighter.
Since the book spring is integrally formed, it is possible to further reduce the number of parts and the number of working steps in this respect as well.

The present invention is not limited to the above embodiment. For example, the present invention can be applied not only to the supporting device for supporting the objective lens as the optical element in two directions shown in each of the above-described embodiments, but also to the supporting device only in the focus direction, and also to the supporting device for the galvano mirror.
Further, a liquid damping material can be used instead of the gel damping material. Further, in the embodiment, a metal plate, a wire, or the like is used as the support spring as the support member of the optical system supporting device, but the present invention is not limited to these, and a resin spring or the like is also the same.

[0045]

According to the present invention, the holding member for the damping material is provided on the support member for supporting the holding member for the optical element, so that the member can be made larger or a special member can be used for holding the damping material. The damping material can be arranged on the support member without adding the. Therefore, an optical system supporting device having a small size, a light weight, and excellent control characteristics can be obtained, and the optical information recording and / or reproducing device can be made smaller and have higher performance.

[Brief description of drawings]

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

FIG. 2 is a diagram for explaining a coil connection in the example.

FIG. 3 is likewise a detailed view for explaining the end portion of the spring.

FIG. 4 is a diagram showing a modified example of a spring end portion.

FIG. 5 is an enlarged view of the vicinity of a spring fixed end, showing a main part in another embodiment of the present invention.

FIG. 6 is a diagram for explaining the electrical connection of the coil, showing the main part in still another embodiment of the present invention.

FIG. 7 is also a detailed view of a soldering portion at the end of the spring.

FIG. 8 is a detailed view of the vicinity of the end of the spring.

FIG. 9 is a detailed view of the vicinity of a spring end, showing a main part in still another embodiment of the present invention.

FIG. 10 is an enlarged view of a spring end and a cross-sectional view of the spring, showing a main part in still another embodiment of the present invention.

FIG. 11 is a perspective view showing the overall configuration of an apparatus according to still another embodiment of the present invention.

FIG. 12 is an enlarged view of the vicinity of a spring end portion in the same example.

FIG. 13 is a diagram showing a conventional example.

FIG. 14 is a diagram showing another conventional example.

FIG. 15 is a diagram showing still another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Objective lens 2 Focus coil 2a Terminal 3 Tracking coil 3a Terminal 4 Holding member 4a Fixed part 4b Convex part 5 Base 6a Outer yoke 6b Inner yoke 7 Magnet 8 Fixing member 8a Fixed part 8b Convex part 9 Spring 9a Spring end part 9b, 9c Projection 9m Space 9d, 9e, 9p Wall 9q Tip 9r Bent 9s Projection 10 Gel-like damping material 11 Relay board 14 Boss 15 Groove 16 Solder 17 Round hole 18 Hole 19 Spring 19a Spring end 19b Projection 19e Bent portion 29 Coil spring 39 Spring 39g End portion 39h Beam-like portion 39i Root portion 39j Holding portion portion 39n End portion main body portion

Claims (1)

[Claims] 1. An optical system comprising an optical element, a holding member for holding the optical element, a support member for movably supporting the holding member, and drive means for driving the holding member in a predetermined direction. In the system supporting device, a holding portion for holding a gel damping material is provided at at least one position of the supporting member, and the gel damping material is arranged here.