Optical: systems and elements – Lens – With support
Patent
1993-10-12
1995-07-11
Ben, Loha
Optical: systems and elements
Lens
With support
359694, 359697, G02B 702, G02B 1514
Patent
active
054326397
ABSTRACT:
An apparatus for detecting an initial position of a movable lens in a lens barrel in which a lens holder retaining the lens is reciprocally movable parallel to an optical axis of the lens. The apparatus includes a magnet arrangement which has north and south polarities and is secured to either the outer periphery of the lens holder or the inner periphery of the lens barrel. A magnet flux detecting device is secured to whichever of the outer periphery of the lens holder or the inner periphery of the lens barrel to which the magnet arrangement is not secured, and is arranged such that it faces a boundary between the polarities of the magnet arrangement. The detecting device detects magnetic flux density of the magnet arrangement and outputs a voltage based on the detected magnetic flux density. The initial position of the lens is determined when the output voltage indicates zero or approximately zero.
REFERENCES:
patent: 3041416 (1962-06-01), Kuhrt
patent: 3199630 (1965-08-01), Engel et al.
patent: 3329833 (1967-07-01), Dorsch
patent: 3344347 (1967-09-01), Stevens
patent: 3473109 (1969-10-01), Maaz et al.
patent: 4043642 (1977-08-01), Hirose et al.
patent: 4086519 (1978-04-01), Persson
patent: 4086533 (1978-04-01), Ricouard et al.
patent: 4318038 (1982-03-01), Munehiro
patent: 4325614 (1982-04-01), Grimes
patent: 4361805 (1982-11-01), Narimatsu et al.
patent: 4401944 (1983-08-01), Narimatsu et al.
patent: 4403515 (1983-09-01), Iwasaki
patent: 4740064 (1988-04-01), Kono et al.
patent: 4750821 (1988-06-01), Yamamoto et al.
patent: 4996545 (1991-02-01), Enomoto et al.
Patent Abstracts of Japan, vol. 14, No. 25, of Jan. 18, 1990.
Patent Abstracts of Japan, vol. 6, No. 198, of Oct. 7, 1982.
Patent Abstracts of Japan, vol. 11, No. 110, of Apr. 7, 1987.
Ben Loha
Kananen Ronald P.
Nguyen Thong
Sony Corporation
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