TWI278855B - Driving apparatus for objective lens - Google Patents

Abstract

This invention provides a driving apparatus for objective lens for light pick-up. The driving apparatus for objective lens enables the actuator moving portion, which is formed by a lens holder used to holder an objective lens, to be displaceably supported on the frame. An abutting portion is provided on the pick-up moving portion. An actuator frame integral with the frame is arranged about the two outsides of the pick-up moving portion. Stopper is provided respectively on the left and right upper portion of said actuator frame. Thus, the action beyond specified action toward the disc direction of the moving portion can be limited by the abutment of the stopper with the abutting portion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS (I) Field of the Invention The present invention relates to an optical pick-up objective lens driving device. (2) In the prior art, an optical head system that optically performs signal reading or signal writing on a signal recording medium such as a disc has a casing, and a semiconductor laser and a genus belonging to the illuminating element are assembled therein. The photodetector of the light receiving element. A frame made of a steel plate is disposed in the casing, and an actuator frame integrated therewith is disposed in the vicinity of both side faces of the movable portion including the lens, and a casing is mounted in a lower portion of the frame.

Further, in the lens holder of the movable portion, a support portion is provided on each of the left and right side surfaces as the upper portion on the disc side and the lower portion on the opposite side. The lens holders are respectively supported by the suspension lines on the support portions of the four locations. The other end of each suspension wire is provided with a holding portion for holding the suspension wire, and the holding portion is screwed to the frame. The lens frame supported by the suspension wire is formed integrally with the coil reel, and a protruding abutting portion is provided on the coil reel. Further, a cover made of a steel plate covering the entire movable portion is disposed on the actuator frame. Further, the upper portion of the actuator frame disposed on the left and right side surfaces of the movable portion covers the upper end portions of the cover by a bent plate spring. Therefore, when the inner surface of the bent inner surface of the cover abuts against the abutting portion during the operation, the operation other than the predetermined direction of the movable portion toward the disc direction is restricted. Therefore, the inner surface of the cover and the abutting portion are configured as a stopper mechanism. [Patent Document 1] Japanese Patent Application Laid-Open No. Hei. No. 2000-251298 A 5- φ \ 127 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ As described above, 'arrangement' attaches a cover made of a steel plate for covering the entire movable portion to the actuator frame near both sides of the suspension wire, and the stopper portion of the cover and the upper surface of the coil reel The joints abut each other. However, in the ultra-thin optical pickup, on the one hand, it is necessary to ensure the gap between the disc and the optical pickup cover, and the lens movable amount, and on the other hand, it is necessary to achieve miniaturization, and thus the upper portion of the magnetic circuit can be made. The formation of the stopper depending on the configuration of the optical pickup cover becomes difficult. That is, in the movable range limitation of the objective lens of the prior art, which covers the entire cover of the optical pickup as the stop member, the lens is movable due to the influence of the mounting position deviation of the cover on the lens of the posture control. The range is biased. When there is a deviation in the movable range, the amount above and below the lens holder is made larger than necessary, and the stress of the suspension line is increased. In an extreme case, when an external force (impact) is applied, the contact state of the stopper becomes unbalanced, and thus the suspension line is deformed. The present invention is intended to provide an objective lens driving device that can solve the above problems. (3) Description of the invention

[Means for Solving the Problem] The movable portion of the optical pickup is provided with an abutting portion, and an actuator frame integrated with the frame is disposed near both sides of the movable portion of the optical pickup, at the upper portion of the actuator frame Each of the stoppers is provided, and when the stopper and the abutting portion abut each other, the operation other than the regulation of the movable portion toward the disc direction is restricted. (4) Embodiments Fig. 1 is a perspective view showing an embodiment of an objective lens driving device of the present invention. Fig. 2 is a view showing a part of an essential part of the objective lens driving device shown in Fig. 1 -

A perspective view of the removed state, and Fig. 3 is a perspective view of the objective lens driving device shown in Fig. 1 in a different direction. The objective lens 1 is held on the lens holder 2 while a bobbin 2a is integrally formed at its end. On the bobbin 2a, a focus coil 3 is wound around the inner circumference, and the tracking coils 4, 5 are brought into contact with the focus coil 3 in the bobbin 2a to be wound at a predetermined position.

Further, on the left and right side faces of the lens holder 2, two upper and lower suspension wires 6 which are parallel to each other are disposed. Here, the upper and lower sides of the objective lens driving device are referred to as the upper side, the upper portion, the upper surface, and the upper end, and the portions away from the disk side are referred to as the lower side, the lower side, the lower side, and the lower end. A total of four suspension wires 6 are respectively formed as elastic supports of the lens holder 2. One end of the suspension wire 6 disposed on the upper side is supported by a support portion 2b integrally formed with the lens holder 2, and a sub-support portion 2c provided on an extension line of the support portion 2b which is also integrally formed with the lens holder 2. On the other hand, one end of the suspension wire 6 disposed on the lower side is supported by the support portion 2d integrally formed with the lens holder 2, and the sub-support portion 2e provided on the extension line of the support portion 2d which is also formed integrally with the lens holder 2. . Here, the interval between the sub-supporting portion 2e and the supporting portion 2d is set to be shorter than the interval between the sub-supporting portion 2c and the supporting portion 2b. Then, the other ends of the four suspension wires 6 are welded to the holding member 7 and the printed substrate 8 attached to the holding member 7, respectively. The printed board 8 and the holding member 7 are fixed to the steel frame 9 by screws 1 。. Thus, the objective lens driving portion is supported on the frame 9 in a variable position and elastically. Further, on both side faces of the lens holder 2, an abutting portion 2f projecting outward in the direction of the side surface is integrally formed between the individual support portions 2b and 2d. Further, the focus coil 3 and the tracking coils 4, 5, and the same magnetic -7 are provided.

The pole faces (N poles) are paired with one pair of magnets 1 1 and 12. A pair of magnet turns 12 are attached to the opposing yokes 1 3 and 14 integrally formed with the frame 9. Further, the actuator frame 15 integrated with the frame 9 is disposed in the vicinity of the outer sides along both side faces of the suspension wire 6.

Then, on the actuator frame 15, a steel plate stopper 17 which is provided across the upper end and the lower end thereof is attached. The stopper 17 is attached to the actuator frame 15 by the tensioned claws 17a, 17b provided at the upper end portion and the claws 17c, 17d provided at the lower end portion. At the upper portion of the stopper 17 is provided a flange having an abutting surface 17e that abuts against the abutting portion 2f. The magnetic flux generated from the magnets 1 1 and 12 acts on the effective area of the focus coil 3 and the tracking coils 4, 5. Here, by supplying the focus error signal to the focus coil 3, it is possible to perform control for driving the objective lens 1 together with the lens holder 2 to focus the light beam on the signal surface of the disc. Moreover, by supplying a tracking error signal to the tracking coils 4, 5, tracking control can be performed to follow the signal track of the disc, so that the objective lens 1 can be driven together with the lens holder 2 to track and record on the disc. Signal on.

In the objective lens driving device configured as above, the positional accuracy of the abutting surface 17 e of the stopper 17 provided on the left and right actuator frames 15 integrated with the frame 9 is attached, and is integrally provided The positional accuracy of the abutting portion 2f on the movable portion is high. [Effects of the Invention] In the objective lens driving device of the present invention, the movable portion of the optical pickup is provided with an abutting portion, and the frame is integrated with the frame in the vicinity of the left and right sides of the movable portion of the optical pickup. The actuator frame is provided with a stopper on the upper part of the actuator frame, and by the abutment of the stopper and the abutting portion, the movable frame can be moved by 8 to 123⁄4. ] ..... — The movement of the part toward the disc is restricted. In the prior art, in the configuration in which the cover covers the entire upper portion of the optical pickup, only a small gap between the optical pickup and the entire disk can be ensured, but when the present invention is used, it is ensured that the gap has a margin. . In the prior art, both ends of the steel plate cover attached to the frame are bent to cover the tracking coil and the focus coil, and the bent portion is used as a leaf spring to be used as a stopper. Therefore, when the mounting condition is not good and the cover is floated, the contact state with respect to the stopper becomes a left-right imbalance. On the other hand, in the present invention, since the stoppers are reliably attached to the left and right designated positions, the reference points of the left and right stoppers __ are not changed, and the abutment positions are the same. Therefore, there is an effect that the risk of increasing the stress of the wire due to the floating of the cover is reduced. Further, when the lens posture in the tangential direction in which the entire objective lens mechanism is moved is adjusted, the stopper is integrally displaced from the frame, so that the contact portion with the lens holder can always secure the parallel positional relationship, thereby preventing the generation of the line. The effect of deformation 0

Further, since the abutting portion is integrally molded between the upper and lower side support portions of the left and right side faces of the lens holder, the strength is excellent. (5) Brief Description of the Drawings Fig. 1 is a perspective view showing an embodiment of the objective lens driving device of the present invention. Fig. 2 is a perspective view showing a state in which a part of the main portion of the objective lens driving device shown in Fig. 1 is removed. Fig. 3 is a perspective view of the objective lens driving device shown in Fig. 1 in a different direction. [Description of symbols] One 9 one

1 objective lens 2 lens holder 2a spool 2b, 2d support 2 c, 2 e sub-support 2f abutment 3 focus coil 4, 5 tracking coil 6 suspension wire 7 holding member 8 printed circuit board 9 frame 10 screw 11, 12 magnet 13,14 opposite yoke 15 actuator frame 17 stopper 1 7a, 1 7b claw 1 7c, 1 7d claw 1 7e abutment surface

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Claims (1)

1_页年月日日第93 1 05 650 "Objective lens driving device" patent case (corrected on June 27, 2006) Pickup, patent application scope: 1 · An objective lens driving device, which is a lens holder for holding an objective lens (lens The movable portion of the actuator formed by the holder is variably supported on the frame, and is characterized in that an abutting portion is provided on the movable portion of the optical pickup, in the vicinity of the two outer sides of the movable portion of the optical pickup An actuator frame integrated with the frame is disposed, and a stopper is disposed on each of the left and right upper portions of the actuator frame. The abutting portion of the stopper member abuts the abutting portion to move the movable portion toward the ' Actions other than those specified in the disc direction are limited. [2] The objective lens driving device according to the first aspect of the invention, wherein the abutting portion is respectively provided on the left and right side surfaces of the lens holder which is supported by the movable portion of the actuator in a linear position by a linear suspension line . 3 · The objective lens driving device of claim 2, wherein the abutting portion is one The body molding is disposed between the upper and lower support portions on the left and right sides of the lens holder. 4. The objective lens driving device according to claim 1, wherein the stopper is made of a steel plate and provided with a claw having a tension, and is attached to the actuator frame by the claw. -1