Patent ID: 6456800
Filing Date: 2002-09-24
Classification: G03B

Abstract:
A frame size changing device for a camera to change a frame size by masking part of an aperture defining the maximum size of said frame, comprising:a pair of light-shielding curtain members, said pair of light-shielding curtain members being flexible; a pair of drawing mechanisms located outside of said aperture, said pair of drawing mechanisms being biased to draw said pair of curtain members to move away from said aperture, respectively; a manually operable member that is manually operated to move within a predetermined movable range, said pair of curtain members to be inserted in and retracted from said aperture in accordance with the movement of said operable member; a holding mechanism that holds said manually operable member at a desired position within said movable range; said manually operable member is connected to an end of one of said pair of curtain members, an end of the other one of said pair of curtain members is connected with said end of one of said pair of curtain members through an interlocking mechanism; and wherein said interlocking mechanism includes a belt, one end of said belt being secured to the end of one of said pair of curtain members, said belt being turned round a shaft member that is fixed to said camera, the other end of said belt being connected to the end of the other one of said pair of curtain members, said pair of curtain members moving in opposite directions with respect to the center line of said aperture.