Actuator for objective lenses

Details Actuator for objective lenses Actuator for objective lenses

2000-06-26

2001-12-11

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With support

C359S813000, C359S824000

Reexamination Certificate

active

06330120

ABSTRACT:

TECHNICAL FIELD
The present invention relates to an object lens actuator for use in optical disk devices and other applications.
BACKGROUND OF THE INVENTION
As a support structure for an object lens actuator for optical disk devices, it is conventionally known to resiliently support a lens holder retaining an object lens with a wire member extending from a base member as disclosed in Japanese UM registration No. 2521564. In this conventional arrangement, a piece of viscoelastic material is used for damping the resonant vibrations of the wire member and other parasitic vibrations.
However, this conventional arrangement has the following problems.
1) Because the viscoelastic material piece is placed adjacent to the mounting part of the wire member, the deformation of the spring member caused by the movement of the holder is relatively small. Therefore, the shear force acting between the wall of the space surrounding the free end of the wire member and the spring member is so small that an adequate damping effect may not be produced.
2) Because of the need to fill the viscoelastic material into the space surrounding the mounting portion of the wire member, the work efficiency is low.
3) Because the viscoelastic material is required to be filled into the space which is larger than the outer profile of the wire member, when the viscoelastic material is required to be cured by ultraviolet radiation, the space is required to be formed with transparent resin material (transmitting ultraviolet radiation) so that there is a restriction on the selection of the resin material.
SUMMARY OF THE INVENTION
To eliminate such problems of the prior art, and achieve an adequate damping effect while improving the work efficiency in forming the damping means, the present invention provides an object lens actuator, comprising a lens holder retaining an object lens, a resilient support member extending from a base member toward the lens holder for resiliently supporting the lens holder with respect to the base member, and drive means for actuating the lens holder in focusing and tracking directions, further comprising: an auxiliary damping member extending from at least one of the lens holder and the base member along the length of the resilient support member; and damper means provided between the resilient support member and the auxiliary damping member or between two of the auxiliary damping members; or further comprising a pair of auxiliary damping members extending from the lens holder and base member, respectively, along the length of the resilient support member; and damper means provided between the opposing ends of the auxiliary damping member.


REFERENCES:
patent: 5579176 (1996-11-01), Ikegame et al.
patent: 6163416 (2000-12-01), Uekusa et al.
patent: 6259671 (2001-07-01), Shibusaka
patent: 62145540 A (1987-06-01), None
patent: 3125337 A (1991-05-01), None
patent: 2521564 (1992-10-01), None
patent: 5076331 A (1993-03-01), None
patent: 7105551 A (1995-04-01), None
patent: 8194960 A (1996-07-01), None
Microfilm of the specification and drawings first annexed to the request of Japanese Utility Model Application No. 403549/1990 (Laid-open No. 90015/1992), Aug. 6, 1992.
Patent Abstracts of Japan, JP62145540A, http://www.patents.ibm.com/cgi-bin/viewpat.cmd/JP62145540A2, JPO & Japio, 1987, 1stp.
Patent Abstracts of Japan, JP3125337A, http://www.patents.ibm.com/cgi-bin/viewpat.cmd/JP03125337A2, JPO & Japio, 1991, 1stp.
Patent Abstracts of Japan, JP5076331A, http://www.patents.ibm.com/cgi-bin/viewpat.cmd/JP05076331A2, JPO & Japio, 1993, 1stp.
Patent Abstracts of Japan, JP7105551A2, http://www.patents.ibm.com/cgi-bin/viewpat.cmd/JP07105551A2, JPO, 1995, 1stp.
Patent Abstracts of Japan, JP8194960A, http://www.patents.ibm.com/cgi-bin/viewpat.cmd/JP08194960A2, JPO, 1996, 1stp.

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