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US 5,970,268 AGranted
Shutter device of camera having a light blocking member with a variable starting position
AssigneeCanon Kabushiki Kaisha
InventorChikara Aoshima
Life of this patent
Estimating the term…
Abstract
A shutter device having a first light blocking member which travels from a closed state to a fully open state for making exposure, and which is driven by a first motor. A second light blocking member travels from a predetermined position to a closed state for making exposure, and is driven by a second motor. A control circuit controls the driving actions of the first and second motors, and a varying mechanism varies, according to a set condition, the predetermined position at which the second light blocking member starts travelling for making exposure.
Claims12
A shutter device comprising:
- a) a first light blocking member arranged to travel from a closed position to a fully open position for making exposure;
- b) a first motor arranged to drive said first light blocking member;
- c) a second light blocking member arranged to travel from a starting position to a closed position for making exposure;
- d) a rotary member arranged to engage said second light blocking member and to rotate to cause said second light blocking member;
- e) a second motor arranged to drive said second light blocking member;
- f) a transmission member to which a driving force of said second motor is constantly transmitted, said transmission member having a first region in which said transmission member transmits the driving force of said second motor to said rotary member and a second region in which said transmission member does not transmit the driving force of said second motor to said rotary member;
- g) control means for controlling driving actions of said first and second motors;
- and
- h) varying means for varying the starting position of said second light blocking member, wherein said varying means varies a change-over position between the first region and the second region of said transmission member according to a set condition.
6 more elements
A camera having a shutter device comprising:
- a) a first light blocking member arranged to travel from a closed state to a fully open state for making exposure;
- b) a first motor arranged to drive said first light blocking member;
- c) a second light blocking member arranged to travel from a starting position to a closed state for making exposure;
- d) a rotary member arranged to engage said second light blocking member and to rotate to cause said second light blocking member;
- e) a second motor arranged to drive said second light blocking member;
- f) a transmission member to which a driving force of said second motor is constantly transmitted, said transmission member having a first region in which said transmission member transmits the driving force of said second motor to said rotary member and a second region in which said transmission member does not transmit the driving force of said second motor to said rotary member;
- g) control means for controlling driving actions of said first and second motors;
- h) photographing condition setting means for setting a photographing condition;
- and
- i) varying means for varying the starting position of said second light blocking member, wherein said varying means varies a change-over position between the first region and the second region of said transmission member according to the photographing condition set by said photographing condition setting means.
7 more elements
Dependencies are inferred from the claim text.