JP2706089B2 - Optical system support device of optical recording / reproducing device - Google Patents

Description

The present invention relates to an optical recording / reproducing apparatus for recording and reproducing information optically by projecting a light spot on a recording medium such as a disk via an objective lens. And an optical system supporting device.

[Conventional technology]

In order to accurately record and reproduce information with an optical recording / reproducing device, it is necessary to control a driving device so that a light spot correctly follows an information track. For this reason, there is a type in which the movable member is supported by an elastic support member so that the objective lens can be moved in a focusing direction parallel to the optical axis thereof and in a tracking direction orthogonal thereto, and is displaced by an electromagnetic driving means. As the elastic support member, a thin metal wire or a thin metal plate is used. There are various positioning methods for fixing the elastic support member to a fixed member or a movable member provided with a lens. For example, as shown in JP-A-60-10430 (FIG. 27) and JP-A-60-197941, a linear elastic support member 56 is inserted into a hole formed in a holder 55 or a connecting member. Parts, and Japanese Patent Application Laid-Open Nos. 60-263347 and 60-263347.
No. 246032, in which the end of the support spring is fitted into a groove formed in a fixed frame or the like, or as shown in JP-A-60-98530, the end of a leaf spring. To a fixed support.

[Problems to be solved by the invention]

However, when the drive unit of the optical system is reduced in size, the wire diameter or the thickness of the metal wire or metal plate as the elastic support member is reduced to 0.
It has to be extremely small, 1 to 0.2 mm. On the other hand, the movable member and the fixed member that hold the elastic support member are often formed of synthetic resin or formed by mechanical processing such as pressing. In this case, the minimum hole diameter and groove width that can be formed are determined by the mold strength. The lower limit is about 0.3 mm in consideration of the decrease of the height. For this reason, when the end of the elastic support member is positioned by inserting or the like into the hole or groove of the movable member or the fixed member, the end in the hole or groove is
It moves about 0.1 to 0.2 mm, which makes it impossible to accurately maintain the relative positional relationship between the movable member, the fixed member, and the elastic support member, resulting in eccentricity and inclination of the optical axis of the objective lens. In particular, in the case of an objective lens having a numerical aperture of 0.5 or more used for a high recording density optical disk such as a magneto-optical disk or a moving image file, a slight inclination of the optical axis causes a large aberration, and writing to the optical disk. There is a problem that characteristics such as reading from an optical disk and the like are deteriorated. Further, there is also a problem that the objective lens is unexpectedly displaced or harmfully oscillated when driven in the focus direction and the tracking direction, which makes it difficult to control the objective lens by servo. On the other hand, when the end of the leaf spring is applied to the fixing member, it must be held down in some way until the end of the leaf spring is completely fixed, resulting in poor workability and deformation. There was also danger.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problems. An optical system supporting apparatus of an optical recording / reproducing apparatus which can be easily and properly performed when an elastic supporting member is fixed to a fixed member or a movable member. The purpose is to provide.

[Means and actions for solving the problem]

The present invention provides an optical recording / reproducing apparatus which connects a movable member holding an optical system to a fixed member via a plurality of elastic support members to support the optical system so that the optical system can be driven in at least one direction. In the optical system supporting apparatus, at least one of the movable member and the fixed member is formed along with the axial direction of the elastic supporting member formed of a material having high rigidity, and the elastic supporting member positioning that supports the outer surface of the elastic supporting member in a point or line contact manner. A space in which the width of the elastic support member in a direction perpendicular to the axial direction is larger than the positioning space so as to form a space for use, and an end of the elastic support member is positioned in the positioning space.

Thus, the space between the positioning portion and the elastic support member is made small while the space for positioning the elastic support member is large, so that the positioning of the elastic support member can be performed easily and properly. .

〔Example〕

FIG. 1 is an overall view of an optical system driving device using the present invention. The objective lens 1 has a focus coil 2 wound thereon,
The tracking coil 3 is fixed to the movable member 4 to which the tracking coil 3 is bonded. An outer yoke 6 and an inner yoke 7 are provided on the base 5, and a magnet 8 is bonded inside the outer yoke 6 to form two sets of magnetic circuits. One outer yoke 6
A fixed member 9 is fixed to the fixed member 9, and four round holes 11 and 12 are formed in the fixed member 9 and the movable member 4 so as to correspond to each other. Inserted into 11 and 12 and fixed. The movable member 4 is supported on the fixed member 9 by four metal wires so as to be movable in the focus direction and the tracking direction. Then, a driving force is generated, and the movable member 4 moves in each direction.

FIG. 2A shows the relationship between the elastic support member and the round holes of the movable member and the fixed member, which is a first embodiment of the optical system support device. The round holes 11 and 12 are formed in the movable member 4 and the fixed member 9 at an angle θ ₁ and θ _{2 with} respect to the axis of the metal wire 10. When viewed from the axial direction of the metal wire 10, this hole is similar to a part of the hole cross-section penetrating, and the diameter of the elastic support member axial penetration portion (hereinafter abbreviated as the penetration portion) is defined as the diameter of the metal wire. Make the minimum diameter enough to insert 10. The diameter of the penetrating portion thus formed can be set to 0.05 mm or less. FIG. 2B shows the relationship between the penetrating portion E and the hole cross-sectional diameters φD ₁ and φD ₂ . Therefore, when the metal wire 10 is inserted into the penetrating portion E, it is supported so as to be in contact at two points and is properly positioned. The penetrating portion E is formed on each of the movable member 4 and the fixed member 9, and both of them are aligned on the axis of the metal wire 10.

FIG. 3 shows a second embodiment of the present invention, in which a square hole 13 is formed on the movable member and the fixed member unlike the first embodiment, and the axis of the square hole 13 is It is inclined by the angle θ. According to this embodiment, the metal wire 10 is inserted into the through hole F.
Is inserted, it is supported so as to be in contact at four points, so that more appropriate positioning can be performed. Hereinafter, the movable member 4 will be described as an example.

FIG. 4 shows a third embodiment of the present invention, in which a triangular hole 14 is formed in the movable member 4 and when the metal wire 10 is inserted into the through portion G as shown in FIG. It is supported to touch. There is an effect similar to that of the third embodiment.

FIG. 5 shows a fourth embodiment of the present invention, in which a leaf spring 15 is used as an elastic support member.
The hole to be formed is a square hole 16. Penetration H
Is set substantially equal to the end face of the leaf spring 15, so that positioning can be performed more appropriately.

FIG. 6 to FIG. 10 show the fifth to ninth embodiments, which are different from the above embodiments and show an embodiment in which a groove is formed instead of a hole. The hole continuous to the groove entrance has various shapes including a notch circle, and the through portions along the axis of the elastic support member are formed like H, I, J, K, L, M respectively . In these embodiments, when the metal wire 10 and the leaf spring 15 as the elastic support members are inserted, they can be inserted from the groove entrance, so that it is very easy and the production efficiency can be improved. Moreover, the proper positioning of the elastic support member in the through portion after insertion is the same as in the above-described embodiment.

FIG. 11 shows a tenth embodiment of the present invention. In forming a hole in a movable member, the center is eccentrically formed from both sides, and a portion where two holes overlap each other is defined as a penetrating portion N as a metal wire 10. Is inserted. By making the penetrating portion N a minimum diameter enough to allow the metal wire 10 to be inserted, the inserted metal wire 10 is supported so as to be in contact at two places in the penetrating portion N and is properly positioned. . Eleventh
FIGS. C and D show an embodiment in which the leaf spring 15 is positioned instead of the metal wire 10.

FIG. 12 shows an eleventh embodiment of the present invention. Unlike the tenth embodiment, the holes formed from both sides of the movable member 4 are diamond-shaped holes 24,2.
5 is assumed. In this embodiment, the metal wires 10 are supported so as to be in contact with each other at four locations in the through portion O, so that more appropriate positioning can be performed.

FIG. 13 shows a twelfth embodiment of the present invention, in which holes 26 and 27 formed from both sides of the movable member 4 are triangular holes. In the case of this embodiment, the metal wires 10 are supported and positioned so as to be in contact with each other at three places in the through portion P.

In the tenth embodiment to the twelfth embodiment, through holes are formed by combining holes of the same shape. However, holes having different shapes may be combined, and the shape of the holes is also limited. It goes without saying.

14A and 14B show a thirteenth embodiment of the present invention, which is a modification of the embodiment in which holes are formed from both sides of the movable member 4. FIG.
That is, a hole is formed from one side, but a cutout surface that is open to the outside is formed from the opposite side, and a through portion Q along the axis of the metal wire 10 is formed by both. In this embodiment, the metal wire 10 is supported at least in the plane 29 and in the through hole Q. In this embodiment, the structure of the mold is simpler, and the manufacturing cost of the mold is reduced. Further, since the insertion of the metal wire 10 is easy, the production efficiency is improved. However, the effect that the positioning of the metal wire 10 can be performed properly is the same as that in which the holes are formed from both sides of the member. FIGS. 14C and 14D show an embodiment in which the leaf spring 15 is positioned instead of the metal wire.

FIG. 15 shows a fourteenth embodiment of the present invention,
Unlike the embodiment, a diamond-shaped hole is formed from one side, and a cutout surface which is open to the outside is formed from the opposite side, and a through portion R is formed. In this embodiment, the metal wire has a flat surface 31 and a through portion R.
It is supported so that it touches in three places.

It goes without saying that the shape of the hole to be combined with the cutout surface is not limited to a round or rhombic hole.

FIGS. 16A and 16B show a fifteenth embodiment of the present invention in which holes 34 and 35 are formed from both sides of the movable member 4 and a groove 33 is formed in the center to form a penetrating portion S. In this embodiment, the mold is easy to manufacture and the cost is low.
Are supported so as to be in contact with each other at three points, and positioning can be performed properly as in the other embodiments. FIGS. 16C and 16D show an embodiment in which the leaf spring 15 is positioned instead of the metal wire 10. FIG.

17 to 19 show a sixteenth embodiment to an eighteenth embodiment of the present invention, in which holes and grooves are combined to form a through portion for inserting an elastic support member. FIG. 17 shows the positioning of the metal wire 10 by the U-shaped groove 36 and the round hole 37, and FIG.
In FIG. 19, the leaf spring 15 is positioned by the square groove 40 and the square hole 41.

FIG. 20 shows the nineteenth embodiment of the present invention and is an overall view of an optical system driving device. One end of the metal wire 10 is
And is inserted into a hole 43 formed by the plate 42 and positioned and fixed. The other end of the metal wire 10 is inserted and fixed in a hole 45 formed by the fixing member 9 and the plate 44. Fig. 21-
FIG. 23 is an enlarged view of a member forming a hole. As shown in FIG. 21, a trapezoidal groove 9a is formed on the side surface of the fixing member 9, and when the side surface 44a of the plate 44 is abutted and fixed, a hole 45 is formed as shown in FIG. When the metal wire 10 is inserted into the hole 45, the outer surface of the metal wire is supported so as to be in contact with the inside of the hole 45 at three places. As shown in FIG. 23, a hole is similarly formed between the groove 4a and the side surface of the plate by the projection of the movable member 4 and the plate 42. In these cases, it is easy to insert the metal wires 10 of the holes 43 and 45 by making only the mouth into which the metal wires 10 are inserted large.

FIGS. 24A and 24B show a twentieth embodiment of the present invention, in which the fixing member 9 and the plate 44 are integrally formed of plastic or the like.
Reference numeral 44 is connected by a connecting portion 44c so as to be capable of instigating. The insertion of the metal wire 10 into the hole 45 formed by the groove 9a formed on the side surface of the fixing member 9 and the side surface 44a of the plate 44 is the same as in the nineteenth embodiment. In this case, as shown in FIG. 24B, the claw portion 44b of the plate 44 is engaged with the concave portion 9b of the fixing member 9, and the fixing member 9 and the plate 44 are abutted and fixed.

FIGS. 25A and 25B show a twenty-first embodiment of the present invention, in which a recess is formed in a fixing member 47 and a plate 46 is brought into contact with the recess. A triangular hole 47b is formed in the fixing member 47, and an insertion hole 48 at the end of the metal wire is formed by abutting the plate 46.

26A and 26B show a twenty-second embodiment of the present invention, in which a fixing member 49 is formed with a diamond-shaped hole 49a, and a pin 50 with one corner of a diamond-shaped pillar cut off is fitted into the hole 49a. And the side 50a of the pin 50 and the hole 4
9a and 9a form an insertion hole 51 at the end of the metal wire.

The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the elastic support member is not limited to a metal wire having a circular cross section or a leaf spring having a rectangular cross section, and may be an ellipse or a polygon. The material does not need to have a uniform cross-sectional shape, and the material is not limited to metal but may be a polymer material such as plastic. The cross-sectional shape of the hole or groove into which the end of the elastic support member is inserted may be a polygon, an ellipse, an ellipse, or the like. The central axis of the elastic support member and the central axis of the insertion hole or groove are not limited to be parallel, and may have a certain angle.

It is needless to say that the supported optical member is not limited to the objective lens, but may be another lens, a prism, a mirror, a light emitting / receiving element, or the like.

〔The invention's effect〕

As described above, according to the present invention, it is possible to assemble the elastic support member by fixing its end to a hole or groove larger than the cross-sectional width of the elastic support member, so that the production efficiency is improved and the positioning after fixing is fixed to the hole or groove of minimum width. As described above, proper positioning can be easily realized. Therefore, inclination of the optical axis of the lens and harmful resonance vibration can be prevented.

In addition, when forming holes and grooves in the movable member and the fixed member, the mold can be designed to have a sufficient margin, so that the life of the mold is prolonged and the production cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a driving device using the optical system supporting device of the present invention, FIGS. 2A and 2B are cross-sectional views showing a first embodiment of the optical supporting device, and FIGS. 4A and 4B are cross-sectional views of the fourth embodiment. FIGS. 5A and 5B are cross-sectional views of the fourth embodiment. FIG. 6 is a cross-sectional view of the fifth embodiment. 7 is a cross-sectional view of the sixth embodiment, FIG. 8 is a cross-sectional view of the seventh embodiment, FIGS. 9A and 9B are cross-sectional views of the eighth embodiment, and FIGS. Sectional views of the ninth embodiment, FIGS. 11A, B, C, and D are cross-sectional views of the tenth embodiment, FIGS. 12A and 12B are cross-sectional views of the eleventh embodiment, and FIGS. 14A, B, C, and D are cross-sectional views of the thirteenth embodiment, FIGS. 15A and 15B are cross-sectional views of the fourteenth embodiment, and FIGS. 16A, B, C, and D. Is a cross-sectional view of the fifteenth embodiment, FIGS. 17A and B are cross-sectional views of the sixteenth embodiment, FIGS. 18A and B are cross-sectional views of the seventeenth embodiment, and FIG. 19 is a cross-sectional view of the eighteenth embodiment. FIG. 20 shows the entirety of the drive device according to the nineteenth embodiment. 21 to 23 are enlarged explanatory views of a member forming a hole according to the 19th embodiment, FIGS. 24A and 24B are side views showing the 20th embodiment, and FIGS. 25A and 25B are 26A and 26B are front views showing the twenty-second embodiment, and FIG. 27 is an exploded perspective view of a conventional driving device. DESCRIPTION OF SYMBOLS 1 ... Objective lens, 4 ... Movable member 9 ... Fixed member, 10 ... Metal wire 11 ... Round hole, 12 ... Round hole

Claims (3)

(57) [Claims] An optical system supporting apparatus for an optical recording / reproducing apparatus, wherein a movable member for holding an optical system is connected to a fixed member via a plurality of elastic supporting members, and the optical system is movably supported in at least one direction. In at least one of the movable member and the fixed member, a space for elastic support member positioning is formed along the axial direction of the elastic support member formed of a material having high rigidity and supporting the outer surface of the elastic support member at a point or a line. An optical recording / reproducing apparatus, wherein a space in which a width in a direction orthogonal to the axial direction of the elastic support member is larger than the positioning space is formed, and an end of the elastic support member is positioned in the positioning space. Optical system support device for the device. 2. The optical system supporting device for an optical recording / reproducing apparatus according to claim 1, wherein said positioning space is formed by selecting or combining holes, grooves, and planes. 3. The optical system supporting apparatus of an optical recording / reproducing apparatus according to claim 1, wherein said positioning space is formed by a combination of two members.