Exposure control device in a camera
First Claim
Patent Images
1. An exposure control device in a camera, which comprises an iris composed of a pair of iris diaphragms each having an exposure space, which define an iris aperture and each have a guide slot and a pin hole;
- a driving motor which is driven in accordance with brightness of a subject to be taken as an image;
a rocking lever mounted on said driving motor and provided on its both end portions with driving pins which are in engagement with said pin holes formed in said iris diaphragms; and
a base plate having an exposure opening about an optical axis and guide pins slidably fitted one into each guide slot of the iris diaphragms so as to permit the iris diaphragms to move in substantially opposite directions with said rocking lever being, operated by said driving motor, said base plate being provided on its upper surface with guide ribs which come into contact with at least one of said iris diaphragms.
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Abstract
A pair of iris diaphragms are each connected to a driving pin formed on either free end of a rocking lever at one point and are each supported slidably by a single guide pin formed on a base plate, thereby to move smoothly without wobbling. By driving the rocking lever with a motor, the iris diaphragms move in opposite directions to form an iris aperture for determining correct exposure in fast response to the brightness of a subject to be taken as an image.
28 Citations
15 Claims
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1. An exposure control device in a camera, which comprises an iris composed of a pair of iris diaphragms each having an exposure space, which define an iris aperture and each have a guide slot and a pin hole;
- a driving motor which is driven in accordance with brightness of a subject to be taken as an image;
a rocking lever mounted on said driving motor and provided on its both end portions with driving pins which are in engagement with said pin holes formed in said iris diaphragms; and
a base plate having an exposure opening about an optical axis and guide pins slidably fitted one into each guide slot of the iris diaphragms so as to permit the iris diaphragms to move in substantially opposite directions with said rocking lever being, operated by said driving motor, said base plate being provided on its upper surface with guide ribs which come into contact with at least one of said iris diaphragms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- a driving motor which is driven in accordance with brightness of a subject to be taken as an image;
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13. An exposure control device in a camera, which comprises an iris composed of a pair of iris diaphragms each having an exposure space, which define an iris aperture and each have a guide slot and a pin hole;
- a driving motor which is driven in accordance with brightness of a subject to be taken as an image;
a rocking lever provided on its both end portions with driving pins which are in engagement with said pin holes formed in said iris diaphragms;
a link having one end connected to said driving motor and a free end connected to said rocking lever to transmit rotational motion of said motor to said rocking lever;
a base plate having an exposure opening about an optical axis and guide pins slidably fitted one into each guide slot of the iris diaphragms so as to permit the iris diaphragms to move in substantially opposite directions with said rocking lever being operated by said driving motor; and
a guard cover for covering said diaphragms in conjunction with said base plate, which is fixed onto said base plate, said base plate being provided on its upper surface with guide ribs which come into contact with at least one of said iris diaphragms, and said guard cover being provided on its lower surface with longitudinal guide ribs coming into contact with at least one of said iris diaphragms. - View Dependent Claims (14, 15)
- a driving motor which is driven in accordance with brightness of a subject to be taken as an image;
Specification