Micro actuator for controlling focal depth

Details Micro actuator for controlling focal depth Micro actuator for controlling focal depth

2006-07-18

2006-07-18

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S814000, C359S824000, C369S013170, C369S044110, C369S044140, C369S044190, C369S044230, C369S112010, C369S112080, C369S115000

Reexamination Certificate

active

07079329

ABSTRACT:
A micro actuator for controlling a focal depth includes: a lens for forming a focal point by focusing light coming from a light source; a lens mounting unit having a lens mounted therein and allowing the lens to move in one axial direction; and an electromagnetic force generator consisting of a constant magnetic field generating member having a magnetic field in a predetermined direction and a variable magnetic field generating member for changing direction and strength of a magnetic field according to direction and amount of a current, installed at and around the lens mounting unit and causing the lens to move in a direction of an electromagnetic force generated by interaction of the two magnetic field generating members. The micro actuator for controlling a focal depth can be fabricated in a ultra-compact size, available for a mass production, and has a fast response speed.

REFERENCES:
patent: 5515346 (1996-05-01), Watanabe et al.
patent: 6243350 (2001-06-01), Knight et al.
patent: RE37428 (2001-10-01), Watanabe et al.
patent: 6845066 (2005-01-01), Shingo
patent: 6850472 (2005-02-01), Miyazaki et al.
patent: 2005/0083791 (2005-04-01), Watanabe et al.
patent: 63-094442 (1998-04-01), None

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