JPH01279430A - Optical system support for optical system recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain easy and proper positioning of an elastic support member by forming a hole and a slot larger than the cross section width of the elastic support member and inserting and fixing the elastic support member end to the hole and the slot. CONSTITUTION:Round holes 11, 12 are formed to a moving member 4 and a stationary member 9 with a tilt of angles theta1, theta2 with respect to the axial line of a metallic wire 10. Only part of the cross section of the holes when viewing the axial direction of the metallic wire 10 is regarded to be penetrated and the diameter of a through-part E in the axial line direction of the elastic support member is selected to be a minimum diameter sufficiently affording the insertion of the metallic wire 10. With the metallic wire 10 inserted to the through-part E, the wire is supported in a way of two point contact and positioned properly. Thus, proper positioning is simply realized.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical recording and reproducing device that optically records and reproduces information by projecting a light spot onto a recording medium such as a disk through an objective lens. The present invention relates to an optical system support device.

(Prior Art) In order to accurately record and reproduce information using an optical recording and reproducing device, it is necessary to control a driving device so that a light spot correctly follows an information track. For this purpose, there is a system in which a 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 and in a tracking direction perpendicular thereto, and the movable member is displaced by an electromagnetic drive means. A thin metal wire or a thin metal plate is used as the elastic support member, and there are various positioning methods when fixing the elastic support member to a fixed member or a movable member provided with a lens. For example, JP-A-60-10430 (Fig. 28), JP-A-60-10430 (Fig.
As shown in Japanese Patent No. 1-107941, the end portion of a linear elastic support member 56 is inserted into a hole formed in a holder 55, a connecting member, etc.
-263347, Japanese Patent Application Laid-Open No. 60-246032, the end of the support spring is fitted into a groove formed in a fixed frame, etc., and Japanese Patent Application Laid-Open No. 60-9
As shown in Japanese Patent No. 8530, there is a device in which the end of a temporary spring is pressed against a fixed support.

[Problem to be solved by the invention]

However, when the optical system drive device is downsized, the wire diameter or plate thickness of the metal wire or metal plate that is the elastic support member is reduced to 0.
It has to be extremely small, 1 to 0.2 m. On the other hand, movable members and fixed members that hold elastic support members are often molded from synthetic resin or machined by pressing, etc. In this case, the minimum hole diameter and groove width that can be formed are determined by the mold strength. Considering the decrease in J・! Then, the limit is about 0.3 mm. Therefore, when the end of the elastic support member is inserted into the hole or groove of the movable member or the fixed member and positioned, the end moves within the hole or groove by 0.1 to 0.2 degrees. The relative positional relationship between the movable member, the fixed member, and the elastic support member cannot be maintained accurately, resulting in eccentricity or inclination of the optical axis of the objective lens. In particular, the numerical aperture used for high recording density optical disks such as magneto-optical disks and video files is 0.
5 or more has a problem in that a slight inclination of the optical axis causes large aberrations, resulting in deterioration of characteristics such as writing to and reading from an optical disk. Furthermore, when driven in the focusing direction and the trunking direction, the objective lens undergoes unexpected displacement or harmful vibrations, making it difficult to control the objective lens using a servo. On the other hand, when the end of the temporary spring is pressed against the fixing member, the end of the temporary spring must be held down in some way until it is completely fixed, which is difficult to work with and may cause deformation. There were also risks.

The present invention is proposed in order to solve the above problems, and is an optical system support device for an optical recording/reproducing device that enables easy and proper fixing of an elastic support member to a fixed member and a movable member. The purpose is to provide the following.

[Means and effects for solving the problem] In order to achieve the above object, the present invention connects a movable member that holds an optical system to a fixed member via a plurality of elastic support members, and the optical system is connected to at least its light. In an optical system support device for an optical recording and reproducing device that supports driveably in an axial direction and a direction perpendicular thereto, at least one of the movable member and the fixed member is provided with an outer surface of the elastic support member along the axial direction of the elastic support member. In order to form a space for positioning the elastic support member to be supported, a space whose width in a direction perpendicular to the insertion direction of the elastic support member is larger than the positioning space is formed, and the end portion of the elastic support member is placed in the surface positioning space. It is inserted and fixed.

As a result, although the space for positioning the elastic support member is large, the gap between the positioning portion and the elastic support member is small, making it possible to easily and properly position the elastic support member. .

〔Example〕

FIG. 1 is an overall view of an optical system driving device using the present invention. The objective lens 1 is fixed to a movable member 4 to which a focusing coil 2 is wound and a tracking coil 3 is bonded. The base 5 is provided with an outer yoke 6 and an inner yoke 7, and a magnet 8 is bonded to the inside of the outer yoke 6, forming two sets of magnetic circuits. A fixing member 9 is fixed to one of the outer yoke 6, and four round holes 11 and 12 are formed in correspondence with the fixing member and the movable member 4, and four round holes 11 and 12 are formed at the ends of four metal cottons 10. The parts are inserted into the round holes 11 and 12 and fixed with adhesive. The movable member 4 is movably supported by four metal wires relative to the fixed part O 9 in the focusing direction and the tracking direction. Due to this action, a driving force is generated and the movable member 4 moves in each direction.

FIG. 2A shows the relationship between the elastic support member, the movable member, and the circular hole of the fixed member, and is a first embodiment of the optical system support device. The round holes 11, 12 are formed at a certain angle θ1. with respect to the axis of the metal wool 10. The movable member 4 and the fixed member 9 are formed to be inclined by θ2. When viewed from the axial direction of the metal wool 10, this hole is the same as if only a part of the large cross section penetrated through it.
The diameter of this elastic support member axial direction penetrating portion (hereinafter abbreviated as the penetrating portion) is set to a minimum diameter sufficient to allow insertion of the metal wire 10.

The diameter of the through-hole formed in this way can also be 0.05 mm or less. Penetration part E and large cross-sectional diameter φDI+ φD
Figure 2B shows the relationship with 2. therefore,
When the metal wire 10 is inserted into the penetration part E, it is supported and properly positioned so that it contacts at two points.

The penetrating portions E are formed in each of the movable member 4 and the fixed member 9 so that both 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 in the movable member and the fixed member, unlike the first embodiment, and the axis of the square hole 13 is relative to the axis of the metal wire 10. It is tilted by an angle θ. According to this embodiment, when the metal cotton 10 is inserted into the through hole F, it is supported so as to touch at four points, so that more appropriate positioning is possible. Hereinafter, the movable member 4 will be explained 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 penetration part G as shown in FIG. supported so that they touch each other. There is an effect similar to that of the third embodiment.

FIG. 5 shows a fourth embodiment of the present invention, in which a temporary spring 15 is used as an elastic support member, and a movable member 4
The hole formed in is a square hole 16. Penetration part H
Since it is made equal to the end surface of the leaf spring 15, more appropriate positioning can be achieved.

FIGS. 6 to 10 show fifth to ninth embodiments, and unlike the above embodiments, grooves are formed instead of holes. The holes continuous to the groove entrances have various shapes including round notches, and through holes along the axis of the elastic support member are formed as Hll, J, L, and M, respectively. In these embodiments, it is very easy to insert the metal wire 10 and the plate spring 15, which are the elastic support members, because they can be inserted from the groove entrance, and production efficiency can be improved. Furthermore, the elastic support member is properly positioned within the through-hole after insertion, as in the previous embodiment.

FIG. 11 shows a tenth embodiment of the present invention. When forming a hole in a movable member, the center is eccentrically formed from both sides, and the overlapping part of the two holes is used as a through part N to hold a metal wire 10. It is designed to insert . By making this through-hole N a minimum diameter sufficient to allow insertion of the metal wool 10, the inserted metal wire 10 is supported and properly positioned so as to touch at two locations within the through-hole N. . FIGS. 11C and 11D show an embodiment in which a temporary spring 15 is positioned instead of the metal cotton 10.

FIG. 12 shows an eleventh embodiment of the present invention.
Unlike the embodiment, the holes formed from both sides of the movable member 4 are diamond-shaped holes 24 and 25. In this example, metal wire 1
0 is supported so as to be in contact with each other at four locations within the penetrating portion 0, so that more appropriate positioning can be achieved.

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 wire 10 is supported and positioned so as to be in contact with each other at three locations within the penetrating portion P.

In the 10th to 12th embodiments, the through holes are formed by combining holes of the same shape, but holes of different shapes may be combined, and there are no limitations on the shape of the holes. Needless to say, there is no such thing.

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. In other words, a hole is formed from one side, but a cutout surface that is open to the outside is formed from the other side, and the metal wire 10 is formed by both sides.
A penetrating portion Q is formed along the axis. In this embodiment, the metal wires 10 are in contact with each other at least at a plane 29 and are supported in contact within the through hole Q. In this embodiment, the structure of the mold is simpler and the manufacturing cost of the mold is lower. Also,
Since the metal wire 10 can be easily inserted, production efficiency is improved.

However, the effect of properly positioning the metal wire 10 is similar to that obtained by forming holes from both sides of the member. FIGS. 14C and 14D show an embodiment in which temporary C: pxs is positioned instead of the metal wire.

FIG. 15 shows a fourteenth embodiment of the present invention, which differs from the thirteenth embodiment in that a diamond-shaped hole is formed from one side and a cutout surface open to the outside is formed from the other side, and the through-hole R was formed. In this embodiment, the metal wire is supported so as to be in contact with the plane 31 at three locations within the through-hole R.

It goes without saying that the shape of the hole to be combined with the notch surface is not limited to round or diamond-shaped holes.

16A and 16B show the movable member 4 in the fifteenth embodiment of the present invention.
Holes 34 and 35 are formed from both sides of the hole 34, and a groove 33 is formed in the center to form a through portion S. Although this embodiment also makes it easy to manufacture the mold and reduces the cost, the metal wire 10 is supported so as to be in contact with the plane 33 at three points inside the penetration part S, and the positioning can be performed appropriately as in the other embodiments. Ru. Figure 16C
, D shows an embodiment in which a temporary spring 15 is positioned instead of the metal wire 10.

17 to 19 show the 16th to 18th embodiments of the present invention.
This is an embodiment in which a hole and a groove are combined to form a through part for inserting an elastic support member. FIG. 17 shows the positioning of the metal wire 10 using the U-shaped groove 36 and the round hole 37, FIG. 18 shows the positioning of the metal wire 10 using the square groove 38 and the triangular hole 39, and FIG. The temporary spring 15 is positioned with the square hole 41.

FIG. 20 shows a nineteenth embodiment of the present invention and is an overall view of an optical system driving device. One end of the metal cotton 10 is inserted into a hole 43 formed by the movable member 4 and the plate 42, and is positioned and fixed. The other end of the metal wire 10 is inserted into a hole 45 formed by the fixing member 9 and the plate 44, and is positioned and fixed. FIGS. 21 to 23 are enlarged views of members forming holes. As shown in FIG. 21, a trapezoidal groove 9a is formed in 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, it is supported so that the outer surface of the metal wire contacts the inside of the hole 45 at three locations. 23rd
As shown in the figure, a hole is similarly formed between the groove 4a and the plate side surface by the protrusion of the movable member 4 and the plate 42. In these cases, insertion becomes easier if only the mouth of the hole 43, 45 into which the metal cotton 10 is inserted is made larger.

FIGS. 24A and 24B show a twentieth embodiment of the present invention, in which a fixing member 9 and a plate 44 are integrally molded of plastic or the like, and the plate 44 is connected so as to be able to move at a connecting portion 44c. Inserting the metal cotton 10 into the hole 45 formed by the groove 98 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 claws 44b of the plate 44 are engaged with the recesses 9b of the fixing member 9, and the fixing member 9 and the plate 44 are
Touch and fix.

25A and 25B show a 21st embodiment of the present invention,
A recess is formed in the fixing member 47, and the plate 46 is brought into contact with this recess. A triangular hole 47b is formed in the fixing member 47, and by abutting the plate 46, a hole 48 for inserting the end of the metal wire is formed.

26A and 26B show a 22nd embodiment of the present invention,
A diamond-shaped hole 49a is formed in the fixing member 49, and this hole 49a
A pin 50 with one corner of a rhombic column cut off is fitted into the pin 50, and a hole 51 for inserting the end of the metal wire is formed between the side 50a of the pin 50 and the hole 49a.

27A and 27B show a 23rd embodiment of the present invention,
It is suitable for positioning leaf springs. A recess 52a is formed on the upper and lower surfaces of the fixing member 52, and the plate 53 is fixed in contact with the protruding walls on both sides of the recess, thereby forming a hole 54, into which the end of the leaf spring is inserted and positioned. Plate 5
Instead of 3, wrap a belt around the fixing member 52 and tighten the hole 5.
4 may be formed.

The present invention is not limited to the above embodiments, but can be modified in many ways. For example, the elastic support member is not limited to a metal wire having a circular cross section or a plate spring having a rectangular cross section, but may be an ellipse or a polygon. Further, the cross-sectional shape does not have to be like that, and the material is not limited to metal, but may be a polymeric 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 also be polygonal, elliptical, oval, 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 being parallel, but may be at a certain angle.

It goes without saying that the supported optical member is not limited to the objective lens, but may be other lenses, prisms, mirrors, light emitting/receiving elements, etc.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to assemble the elastic support member by inserting its end into a hole or groove that is larger than the cross-sectional width, which improves production efficiency. Since this is done in the same manner as above, proper positioning can be easily achieved. Therefore, tilting of the optical axis of the lens and harmful resonance vibrations can be prevented.

Also, when forming holes and grooves in movable and fixed members,
Since the design dimensions of the mold can be made with sufficient margin, the life of the mold can be extended, and production costs can be kept low.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a driving device using the optical system support device of the present invention, FIGS. 2A and B are sectional views showing the first embodiment of the optical support device, and 31] A and B are Cross-sectional view of the second embodiment, Figures 4A and B
is a sectional view of the third embodiment, FIGS. 5A and B are sectional views of the fourth embodiment, FIG. 6 is a sectional view of the fifth embodiment, and FIG. 7 is a sectional view of the sixth embodiment. Figure 8 is a sectional view of the seventh embodiment, Figures 9A and B are sectional views of the eighth embodiment, Figures 10A and B are sectional views of the ninth embodiment, and Figures 11A and B.
, C, and D are cross-sectional views of the tenth embodiment; FIGS. 12A and B are cross-sectional views of the eleventh example; FIGS. 13A and B are cross-sectional views of the twelfth example; FIGS. 14A and B; C and D are cross-sectional views of the 13th embodiment, Figures 15A and B are sectional views of the 14th embodiment, Figures 16A, B, C, and D are sectional views of the 15th embodiment, and Figure 17A. ,
B is a sectional view of the 16th embodiment, FIGS. 18A and B are sectional views of the 17th embodiment, FIGS. 19A and B are sectional views of the 18th embodiment, and FIG. 20 is a sectional view of the 19th embodiment. FIGS. 21 to 23 are enlarged explanatory views of members forming holes according to the nineteenth embodiment; FIGS. 24A and B are side views showing the twentieth embodiment; FIGS. Figures A and B are front views showing the 21st embodiment, Figures 26 A and B are front views showing the 22nd embodiment, Figures 27 A and B are explanatory views showing the 23rd embodiment, and Figure 28 is a front view showing the 22nd embodiment. FIG. 2 is an exploded perspective view of a conventional drive device. 1... Objective lens 4... Movable member 9...
Fixing member 10...Metal wire 11...Round hole
12... Round hole Fig. 2 A, T1 joint T04 Fixing material 9 Fig. 3 A B //1 Fig. 4, 4 8 mouth) Fig. 8 Fig. 9 A 73 Fig. 10 A B Fig. 11 A B CD No. Figure 2 Figure 13 Figure 14 A B CD Figure 15 A B Figure 16 A B CD Figure 17 A B Figure 18 A B Figure X9 1 Figure 21 Figure 23 Figure 24 Figure 7b Procedure Supplement Official document (method) August 18, 1988 Director General of the Japan Patent Office Yoshi 1) Moon Yi, Indication of the case 1988 Patent Application No. 107519 2 Name of the invention Optical system support device for optical recording and reproducing device 3 , Relationship with the case of the person making the amendment Patent Applicant (037) Olympus Optical Industry Co., Ltd. 4, Agent July 26, 1988 1, page 17, line 5 of the specification is amended as follows. “The 19th embodiment is a cross-sectional view of the 18th embodiment.”Representative patent attorney
Akira Sugimura Hidegai 1 person

Claims (1)

[Claims] 1. A movable member that holds the optical system is connected to a fixed member via a plurality of elastic support members, and the optical system is supported so as to be movable at least in the direction of its optical axis and in a direction perpendicular thereto. In the optical system support device of an optical recording and reproducing device, an elastic support member positioning space is formed in at least one of the movable member and the fixed member, along the axial direction of the elastic support member and supporting an outer surface of the elastic support member. , an optical recording and reproducing apparatus characterized in that a space is formed whose width in a direction perpendicular to the insertion direction of the elastic support member is larger than the positioning space, and an end portion of the elastic support member is inserted and fixed in the positioning space. Optical system support device. 2. The optical system support device for an optical recording/reproducing apparatus according to claim 1, wherein the positioning space is formed by selecting or combining holes, grooves, and flat surfaces. 3. The optical system support device for an optical recording/reproducing apparatus according to claim 1, wherein the positioning space is formed by a combination of two members.