Abstract: An exposure control device for the shutter of a camera wherein an opening member opens the aperture of the shutter to start exposure, a closing member closes the aperture to complete exposure, an opening hook and a closing hook retain at a charged position the opening member and the closing member, respectively. A control member is released by shutter release operation to control the exposure time by shutter release operation to control the exposure time and to successively release said opening member and said closing member. A governor delays the motion of said control member in proportion to desired exposure times. An interlocking lever is adjustable to a first range where it is actuated by the movement of the control member to push the closing hook and to a second range where it is actuated by the movement of the opening member to push the closing hook. An adjusting lever supports the interlocking lever operable within the first and second ranges.

Abstract: A plurality of separate shutter blades are arranged in a plane defined between a pair of base plates each having a shutter exposure aperture. Projections are provided on the base plates for urging the respective blades to be held in intimate contact with each other when the blades are in a position where they cover the aperture.

Abstract: A camera shutter mechanism including a shutter opening member mounted for pivoting about a first axis between a closed position corresponding to a closed shutter and an open position corresponding to an open shutter, and a shutter closing member mounted for pivoting about a second axis between an open position corresponding to an open shutter and a closed position corresponding to a closed shutter. A movable driving member includes a coupling mechanism for releasably coupling the driving member to the shutter opening member to permit moving the shutter opening member by moving the driving member, and for releasing the shutter opening member from the driving member when the shutter opening member is moved from the open to the closed position. A first spring biases the driving member to move the shutter opening member from the closed to the opened position to initiate exposure, and a second spring biases the shutter closing member to move from the opened to the closed position to terminate exposure.

Abstract: A camera shutter includes a pair of spaced apart base plates supporting the various shutter components. At least one of the base plates is formed entirely of synthetic resin material which is electrically insulative and which possesses lubricating properties. The synthetic resin base plate has a set of tubular portions extending toward and connected to the other base plate and also has a set of shafts turnably supporting some of the shutter components, such as the control lever and control cam. The synthetic resin base plate also includes a hollow winding frame about which is wound a coil and in which is slidably inserted an armature to form an electromagnet for use in controlling the shutter operation. The use of a synthetic resin base plate dispenses with the necessity of separate lubrication and enables formation of a smaller shutter.

Abstract: A camera shutter mechanism including an actuating lever for actuating the mechanism, a biasing spring biasing the actuating lever to operate, and a hook lever for releasably holding the actuating lever against the action of the biasing spring. The actuating lever includes a pin extending outwardly therefrom, and a resilient cylindrical bushing loosely fitting around the pin, with the pin positioned so that the spring bears against the bushing to push the bushing against the pin. The pin is positioned so that structure for returning the actuating lever from a rest position to a cocked position pushes against the bushing when returning the actuating lever.

Abstract: A clutch of the single-plate dry-disc type is structured to include annular friction facings secured to opposite surfaces of a supporting plate of a clutch plate and a plurality of recesses or shallow grooves are defined in the surface of one of the annular friction facings. The shallow grooves extend from the inner periphery of the one annular friction facing and terminate short of the outer periphery thereof.Accelerated air streams are introduced from the exterior through the fly wheel into the plurality of grooves so as to aid in separation of the friction facing of the clutch plate from the engaging surface of a fly wheel as a result of a hydrodynamic force created by the air streams. Furthermore, slots are defined in the surface of the friction facing in addition to the grooves so as to provide discharge passages for powder which has been produced due to wear or attrition of the friction facings.

Abstract: A camera shutter control mechanism for controlling a shutter opening comprises an opening member movable in an opening direction for opening the shutter opening to start an exposure and a closing member movable in a closing direction for closing the shutter opening to terminate the exposure. Opening and closing pawls releasably lock the opening and closing members in their charged positions. An operating member actuates the opening pawl so as to release the opening member for movement in the opening direction and during the course of such movement, the opening member actuates an interlock lever which in turn actuates an adjustable fulcrum lever for actuating the closing pawl to release the closing member for movement in the closing direction. An exposure period setting member is arranged so as to adjust the operation of the fulcrum lever with respect to the closing pawl and for selectively effecting movement of the fulcrum lever to operative and inoperative positions.

Abstract: A control device of the shutter for a camera, which is equipped with shutter blades opening and closing an opening for the exposing operation. A control member actuated by the operation of shutter release and starting an opening member begins the exposing operation at the end of said operation, and an electromagnet connected to an electronic delaying circuit adjusts the time of finishing exposure. A magnetic control lever having a magnetic portion opposing said electromagnet and formed with synthetic resin, and a spring exerting a force for separating said magnetic portion of said magnetic control lever from said electromagnet, is constructed such that a flexible portion which presses said magnetic portion on the attracting face of said electromagnet against said spring is formed of synthetic resin on the engaging portion of at least one of said magnetic control lever and said control member.

Abstract: A shutter operating mechanism of a camera shutter which has an opening blade and a closing blade operated sequentially to open and close a shutter aperture for an exposure comprises an opening spring normally biasing the opening blade to move from a closed position in which the opening blade covers the shutter aperture to an open position in which the opening blade uncovers the shutter aperture; a second spring normally biasing the closing blade to move from a closed position in which the closing blade covers the shutter aperture to an open position in which the closing blade uncovers the shutter aperture; and a third spring normally biasing the closing blade to move from said open position to said closed position, the arrangement being such that when the shutter is charged, the opening blade and closing blade are in said closed position and when the shutter is released, the closing blade is moved under the bias of said second spring from said closed position to said open position, then the opening blade is m

Abstract: A camera shutter has a set of shutter blades movable from an initial closed position in which the blades close an exposure aperture to an open position opening the exposure aperture and then to a final closed position again closing the exposure aperture. Opening and closing driving members sequentially drive the shutter blades from the initial closed position to the open position and then to the final closed position to effect an exposure. A cocking mechanism coacts with the opening and closing driving members for cocking the camera shutter to move the shutter blades from the final closed position to the initial closed position in readiness for taking an exposure. A rebound preventing device is provided for preventing rebound of the shutter blades after reaching their final closed positions and comprises a notched pin on a lever of the cocking mechanism engageable with a hook portion of the closing drive member to thereby prevent rebounding of the shutter blades.

Abstract: In a single lens reflex camera, the shutter base plate is provided with a recess in which the reflecting mirror is mounted. This permits the mirror to be closer to the film plane and hence permits the imaging plane, prism and viewing lens of the view finder to be closer to the optical axis of the camera lens, thus reducing the overall size of the camera.

Abstract: An electrically operated shutter in which an exposure aperture is opened by actuation of a shutter blade opening member and closed by actuation of a shutter blade closing member and exposure time is controlled in accordance with the duration of excitation of an electromagnet. The shutter is comprised of a disengaging member for causing said shutter blade closing member to actuate upon being attracted to the electromagnet during excitation thereof, and an engaging member for causing the shutter blade opening member to actuate upon being actuated by the movement of a control member if the shutter is released. When the electromagnet is not normally energized, the disengaging member is engaged by a cam portion of the engaging member on the initial operating period of shutter release and disengaged upon lapse of a preselected time from the shutter opening operation.

Abstract: The operating mechanism for a camera shutter comprises a pivoted actuating member for opening the shutter and a pivoted actuating member for closing the shutter. A driving spring for biasing each of the actuating members in actuating direction has one end acting on the respective actuating member and the other end supported by a ratchet wheel which is coaxial with respective actuating member so that the spring bias can be varied by rotary movement of the ratchet wheel. Spring finger portions of a spring plate which overlies the shutter operating mechanism engage the ratchet wheels to retain them in selected angular positions against the reaction forces of the respective springs. Portions of the spring plate support the spring fingers intermediate their attachment to the spring plate and their free ends engaging the respective ratchet wheels.

Abstract: A camera shutter having an aperture, shutter opening blades which travel from a position covering the aperture to a rest position uncovering the aperture to initiate exposure, and shutter closing blades which travel from a position away from the aperture to a position covering the aperture to terminate exposure, and a shutter blade stabilizing device. The stabilizing device includes an elastic member for frictionally pressing at a leading portion of the shutter opening blades at which the driving force is applied to the blades, when the blades are at the rest position, and a member for pressing against the shutter opening blades at a trailing portion of the blades at a portion where the driving force is applied, when the shutter opening blades are at the rest position. The elastic member and the member for pressing together prevent movement of the shutter opening blades when they are at the rest position.

Abstract: A shutter having two groups of shutter blades. One group of shutter blades opens the shutter and a second group of blades closes the shutter. A shutter-opening actuation member releasably locked by a locking pawl when the shutter is cocked, actuates the shutter-opening group of shutter blades for taking an exposure. A shutter-closing actuation member releasably locked by a second locking pawl actuates the shutter-closing group of shutter blades for completing the taking of an exposure. An electromagnet in an exposure control circuit is energized during the taking of an exposure and deenergized to control the exposure time and terminate the exposure. A control member that controls the release of the control member by its locking pawl is biased by a single spring.

Abstract: A camera shutter having a plurality of shutter blades operable from a shutter-closing operative position to a shutter-opening operative position and back to the shutter-closing operative position. An opening driving lever and a closing driving lever are provided for operating the shutter blades to their operative positions. A rebound preventing arrangement is provided by providing pins fixed on the opening and driving levers and making provision on a cocking lever for holding the driving levers from rebounding upon reaching their terminal operating positions in activating the shutter blades in opening and closing the shutter. The pins on the driving levers are engaged at these terminal positions by the locking lever and releasably held to preclude rebounding thereby to preclude rebounding of the shutter blades.