Exposure amount adjusting device

Details Exposure amount adjusting device Exposure amount adjusting device

1988-10-12

1990-01-30

Gellner, Michael L.

G03B 906

Patent

active

048976814

ABSTRACT:
An exposure amount adjusting device comprises a stepping motor which serves as a drive source and includes a rotor, a stator and an exciting coil; and an exposure amount adjusting arrangement which is driven by the stepping motor. The exposure amount adjusting arrangement includes a fixed member having an aperture to give a passage to light, a positioning member and a bearing which are arranged away from the aperture, the positioning member determining the position of the stator, the bearing rotatably carrying the stator; a rotary member which has another light passing aperture and is arranged to be driven by the rotor; and light shielding blades which are swingably carried by both the fixed and rotary members and arranged to vary their aperture shielding areas according to a rotating position of the rotary member.

REFERENCES:
patent: 4152064 (1979-05-01), Hashimoto et al.
patent: 4806813 (1989-02-01), Sumi et al.

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