Lens shutter for a single lens reflex camera

Claim 2

A lens shutter for a single lens reflex camera comprising, two sectors only, means pivotally mounting said two sectors for movement alternately and individually each in a same sequence from a first stationary position laterally spaced from an exposure aperture for focusing the camera to a second position for closing said exposure aperture and to a third position for opening said exposure aperture, and control means for controlling the movement of said sectors alternately and individually in said sequence for sequentially closing and opening the exposure aperture with each sector and including locking means to determine the time of an exposure with one of the sectors.

Claim 3

A lens shutter for a single lens reflex camera according to claim 1, in which said means pivotally mounting the two sectors comprises means mounting the sectors in said first position on one side of said exposure aperture and on an opposite side of said aperture when said sectors are at said third position.

Claim 4

A lens shutter for a single lens reflex camera according to claim 1, in which said means pivotally mounting the two sectors comprises means operable pivotally individually in movement of said sectors from said first position to said third position, and means interconnecting the sectors for joint rotation from said third position to said first position.

Claim 5

A lens shutter for a single lens reflex camera according to claim 3, in which said means pivotally mounting the sectors mount said sectors with one sector superposed over the other sector in said first and second positions and for travel between said positions in parallel planes, and said means interconnecting the sectors comprising a pin on said one sector extending between said two planes for engagement by the other of said sectors upon movement from said third position to said first position when said shutter is cocked, and said means pivotally mounting said other shutter comprises pivoted means for cocking the shutter.

Claim 6

In a single lens reflex camera having a shutter aperture and an exposure initiating lever, an improved lens shutter device comprising first and second planar shutter sections, first and second sector-mounting means having said first and second sectors fixed respectively thereto for pivotal movement in parallel planes between respective, first, second and third sector positions, wherein both said sectors are disposed to block the shutter aperture when in their respective second positions, and are fully displaced from blocking the shutter aperture when in their respective first and third positions, and wherein said respective first and third positions for each said sector are on opposed sides of said shutter aperture, and lock means coupled to Said exposure initiating lever for releasably engaging said first and second sector mounting means for controlling movement of said sectors in response to actuation of the exposure initiating lever, wherein said first sector is controlled by said lock means to move intermittently from its said first position to its said second position and then to its said third position while said second sector is held in its said first position, and subsequently said second sector is controlled to move intermittently from its said first position to its said second position and then to its said third position while said first sector is held in its said third position, and wherein a film exposure can be effected when said first sector is in its said third position and said second sector is in its said first position.

Claim 7

In a single lens reflex camera having a shutter aperture and an exposure initiating lever, an improved lens shutter device comprising first and second planar shutter sections, first and second sector-mounting means having said first and second sectors fixed respectively thereto for pivotal movement in parallel planes between respective, first, second and third sector positions, wherein both said sectors are disposed to block the shutter aperture when in their respective second positions, and are fully displaced from blocking the shutter aperture when in their respective first and third positions, and wherein said respective first and third positions for each said sector are on opposed sides of said shutter aperture, and lock means coupled to Said exposure initiating lever for releasably engaging said first and second sector mounting means for controlling movement of said sectors in response to actuation of the exposure initiating lever, wherein said first sector is controlled by said lock means to move intermittently from its said first position to its said second position and then to its said third position while said second sector is held in its said first position, and subsequently said second sector is controlled to move intermittently from its said first position to its said second position and then to its said third position while said first sector is held in its said third position, and wherein a film exposure can be effected when said first sector is in its said third position and said second sector is in its said first position.

Claim 8

An improved lens shutter device as set forth in claim 5, further comprising a magnetizable element fixed to said second sector, electromagnet means disposed adjacent said first position of said second sector for attracting said magnetizable element to releasably hold said second sector in its said first position while said electromagnet means is energized, delay circuit means for energizing said electromagnet means and including a switch, and means for actuating said switch upon movement of said first sector from its said second position to its said third position, wherein said delay circuit means deenergizes said electromagnet after a predetermined time interval measured from said actuation of said switch to release said second sector for movement to its said second position.