Light-quantity control device

Details Light-quantity control device Light-quantity control device

1994-12-15

1998-01-06

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310254, 3542341, 3542711, H02K 100, H02K 112, G03B 908, G03B 902

Patent

active

057058733

ABSTRACT:
An optical apparatus having a light-quantity control device includes:
a) a rotating member having a plurality of magnetic poles;
b) a stator having a plurality of magnetic pole sections opposed to the rotating member;
c) a coil for exciting the stator;
d) an input device for inputting driving speed information as the driving speed of the rotating member;
e) an output device for outputting to the coil a driving signal for rotatably driving the rotating member less than one full rotation thereof on the basis of the driving speed information;
f) a detecting device for directly detecting a movement state of the rotating member and outputting a detection signal which varies approximately linearly with the position of the rotating member representing movement state information;
g) a forming device for forming rotating speed information of the rotating member from the detection signal;
h) a correcting device for correcting the driving speed information by the use of the rotating speed information, the correcting device providing a corrected driving speed information; and
i) a light-quantity adjusting member adapted to be displaced by the rotation of the rotating member.

REFERENCES:
patent: 3935524 (1976-01-01), Cap et al.
patent: 4319822 (1982-03-01), Tezuka et al.
patent: 4467233 (1984-08-01), Moren et al.
patent: 4575652 (1986-03-01), Gogue
patent: 4672253 (1987-06-01), Tajima et al.
patent: 4691132 (1987-09-01), Bertram et al.
patent: 4700098 (1987-10-01), Kawashima
patent: 4725752 (1988-02-01), Shirani et al.
patent: 4739125 (1988-04-01), Watanabe et al.
patent: 4874975 (1989-10-01), Hertich
patent: 4884091 (1989-11-01), Nawagomi
patent: 4897681 (1990-01-01), Yamamoto et al.
patent: 4952830 (1990-08-01), Shirakawa
patent: 5000534 (1991-03-01), Watanabe
patent: 5015893 (1991-05-01), Shiozawa
patent: 5072162 (1991-12-01), Sato et al.
patent: 5111098 (1992-05-01), Pecu et al.
patent: 5196940 (1993-03-01), Sato
patent: 5264896 (1993-11-01), Lee et al.
patent: 5361110 (1994-11-01), Haraguchi
patent: 5371633 (1994-12-01), Kawamura et al.
patent: 5418588 (1995-05-01), Chigira
patent: 5430519 (1995-07-01), Shimada et al.
patent: 5489959 (1996-02-01), Akada

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