Stop control device

Details Stop control device Stop control device

1980-06-11

1982-06-08

Adams, Russell E.

G03B 956

Patent

active

043337201

ABSTRACT:
A stop device of the type using a physical property member which is arranged to have its light transmission factor variable and to form a light shielding part and a light transmitting part for effecting adjustment of an aperture value by adjusting the area of the light transmitting part. The area of the light transmitting part for each stopping step of the aperture is determined in relation to the light shielding part and the light transmission factor of the light transmitting part to obtain an effective T number.

REFERENCES:
patent: 3476029 (1969-11-01), Schreckendgust
patent: 3955208 (1976-05-01), Wick et al.
patent: 4054890 (1977-10-01), Shimomura
patent: 4218120 (1980-08-01), Kawamura et al.
patent: 4251141 (1981-02-01), Stemme et al.

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