Photographic camera with focal plane shutter and interchangeable objective shutter

Claim 2

A photographic camera having both a focal plane shutter and an objective shutter, electronic circuit means for controlling opening and closing movements of both shutters, a selector member movable between two positions for respectively selecting the focal plane shutter or the objective shutter for effective exposure operation, and switching means operatively connected to said selector member, said switching means being effective when said selector member is in one position to set said electronic circuit means so that said focal plane shutter will open before and close after exposure-making operation of said objective shutter and when in another position to set said electronic circuit means so that said objective shutter will open before and close after exposure-making operation of said focal plane shutter, both of said shutters completing their full individual operating cycles regardless of which shutter is selected for making the exposure.

Claim 3

A camera as defined in claim 1, in which said objective shutter is in an interchangeable objective unit detachably mounted on a body portion of the camera.

Claim 4

A camera as defined in claim 2, in which said objective unit containing an objective shutter may be replaced on the camera body by a simple objective unit without a shutter, said camera body portion and said simple unit having cooperating interlocking means to prevent said selector member from being moved from focal plane shutter selecting position to objective shutter selecting position so long as said simple objective unit remains mounted in effective position on said camera body portion.

Claim 5

A camera as defined in claim 3, in which said interlocking means includes means for moving said selector member from objective shutter selecting position to focal plane shutter selecting position by the act of mounting said simple objective unit on the camera body portion, if it is attempted so to mount said simple unit while said selector member is in objective shutter selecting position.

Claim 6

A camera as defined in claim 2, in which the electronic circuit means includes a plurality of Schmitt-trigger devices equipped with RC-members and includes holding electromagnets having armatures which constitute function blocking means for individual operating cycles of the two shutters, the holding magnets (540, 548) of the interchangeable objective shutter being arranged within the shutter and being conductively connected with the remainder of the electronic circuit means within the camera body portion by releasable contacts (K1, K2).

Claim 7

A camera as defined in claim 5, in which the camera is a single lens mirror reflex camera with a mirror swingable between a picture taking position and a viewing position, and in which the parts are so arranged that prior to initiation of an exposure cycle said mirror is in viewing position and said focal plane shutter is closed and said objective shutter is open, and that during an exposure cycle said mirror is shifted to picture taking position and both of the shutters perform a running down cYcle from their respective positions mentioned.

Claim 8

A camera as defined in claim 5, wherein said electronic circuit means includes four different delay switching stages (A1, A2, A3, A4) with a Schmitt-trigger device in each stage, the first and fourth switching stages determining a preliminary delay and a terminal delay, respectively, the second switching stage determining a delay during the opening of the first shutter or for a self portrait, and the third switching stage determining a delay which controls the duration of exposure.

Claim 9

A camera as defined in claim 7, in which the first switching stage starts to operate near the beginning of an exposure cycle, and operation of each switching stage initiates the operation of the next succeeding switching stage.

Claim 10

A camera as defined in claim 1, further including a flash circuit having a flash switch for actuating a flash when an exposure is made by the focal plane shutter and a different flash switch for actuating a flash when an exposure is made by the objective shutter, said switching means connected to said selector member being effective to determine which of said flash switches will be effective.

Claim 11

A photographic camera comprising a focal plane shutter, an objective shutter, a first electromagnetic element effective upon predetermined alteration of its magnetic state to initiate an opening movement of said focal plane shutter, a second electromagnetic element effective upon predetermined alteration of its magnetic state to initiate an opening movement of said objective shutter, a third electromagnetic element effective upon predetermined alteration of its magnetic state to initiate a closing movement of said objective shutter, a fourth electromagnetic element effective upon predetermined alteration of its magnetic state to initiate a closing movement of said focal plane shutter, electric circuit means for causing predetermined alteration of the respective magnetic states of said four elements in timed sequence, and change-over switch means selectively settable to cause said electric circuit means to alter the magnetic states of said elements in either one of two sequential orders, said switch means in one setting causing said circuit means to cause said predetermined alteration of the first, second, third, and fourth elements in timed sequence in that order when an exposure is to be made by said objective shutter, said switch means in another setting causing said circuit means to cause said predetermined alteration of the second, first, fourth, and third elements in timed sequence in that order when an exposure is to be made by said focal plane shutter.

Claim 12

A photographic camera comprising a focal plane shutter, an objective shutter, a first electromagnetic element effective upon predetermined alteration of its magnetic state to initiate an opening movement of said focal plane shutter, a second electromagnetic element effective upon predetermined alteration of its magnetic state to initiate an opening movement of said objective shutter, a third electromagnetic element effective upon predetermined alteration of its magnetic state to initiate a closing movement of said objective shutter, a fourth electromagnetic element effective upon predetermined alteration of its magnetic state to initiate a closing movement of said focal plane shutter, electric circuit means for causing predetermined alteration of the respective magnetic states of said four elements in timed sequence, and change-over switch means selectively settable to cause said electric circuit means to alter the magnetic states of said elements in either one of two sequential orders, said switch means in one setting causing said circuit means to cause said predetermined alteration of the first, second, third, and fourth elements in timed sequence in that order when an exposure is to be made by said objective shutter, said switch means in another setting causing said circuit means to cause said predetermined alteration of the second, first, fourth, and third elements in timed sequence in that order when an exposure is to be made by said focal plane shutter.

Claim 13

A camera as defined in claim 10, in which said electric circuit means includes four trippable switching stages arranged in predetermined sequence with each subsequent stage tripped by operation of the next preceding stage, and in which said switching stages are operatively connected to said four electromagnetic elements in a respective sequence determined by the setting of said change-over switch means.

Claim 14

A camera as defined in claim 10, in which said predetermined alteration of the magnetic state of each electromagnetic element, effective to cause initiation of the specified movement of its associated shutter, is alteration from an energized magnetic state to a de-energized non-magnetic state.

Claim 15

A camera as defined in claim 12, in which said electric circuit means includes four trigger stages arranged in sequence and each including Schmitt trigger means, the stages being interconnected to each other in such manner that each stage after the first one is triggered by operation of the next preceding stage, said circuit means initially energizing all of said elements to a magnetic state, operation of said stages serving to de-energize said elements one by one successively in timed relation to each other.