Lens barrel apparatus for automatic focusing

Details Lens barrel apparatus for automatic focusing Lens barrel apparatus for automatic focusing

1991-09-04

1993-06-15

Arnold, Bruce Y.

Optical: systems and elements

Lens

With support

359823, G02B 702

Patent

active

052204618

ABSTRACT:
A novel lens barrel which includes a comparatively small number of parts, has a comparatively low weight and can be produced at a comparatively low cost. The lens barrel apparatus comprises an outer shell, a lens holding member holding a focusing lens thereon and mounted in the outer shell for movement in a direction of an optic axis of the focusing lens, and an actuator including an actuating coil secured to one of the lens holding member and the outer shell and wound around a coil bobbin. The actuator further includes a magnet secured to the other of the lens holding member and the outer shell in a coaxial relationship with the actuating coil around the optic axis, and a detecting coil is wound on the coil bobbin in an overlapping relationship with the actuating coil for detecting a speed of movement of the focusing lens.

REFERENCES:
patent: 5138497 (1992-08-01), Blanding
patent: 5140471 (1992-08-01), Kasahara
Patent Abstracts of Japan, vol. 8, No. 82, Apr. 14, 1984.
Patent Abstracts of Japan, vol. 12, No. 216, Jun. 21, 1988.
Patent Abstracts of Japan, vol. 12, No. 233, Jul. 5, 1988.
Patent Abstracts of Japan, vol. 10, No. 165 Jun. 12, 1986.
Patent Abstracts of Japan, vol. 14, No. 279, Jun. 15, 1990.

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