Abstract:
A focal plane shutter arrangement in which a first group of shutter-opening blades and a second group of shutter-closing blades are actuated by respective pairs of operating levers. The shutter blades are principally supported for parallel movement by means other than the operating levers. Each group of shutter blades has a rectangular slit-forming shutter blade having a straight edge. This blade is moved in a parallel manner in which it is constantly maintained with its straight edge normal to a plane passing transversely of the shutter aperture. The shutter blades are guided in their movement by either arcuate or rectilinear slots and are actuated by a rod connected to the lever system. The shutter blades in each group are supported in independent support except for one which is supported from the slit-forming shutter blade of its respective group. The focal plane shutters is accordingly made compact and the inertia of the individual shutter blade groups is reduced or minimized.
Abstract:
A focal plane shutter and shutter blade operating devices for a camera. The focal plane shutter has a plurality of shutter blades arranged in two separate groups operated independently of each other as a shutter-opening blade group and a shutter-closing blade group. A shutter blade operating mechanism comprises a pair of separate devices for opening and closing the shutter with the two groups independently of each other driven in the same direction. Each shutter blade-operating device has a slit-forming or aperture-forming shutter blade in each group driven separately from the other shutter blades of the groups. A main shutter blade-driving lever and an auxiliary parallel lever are both pivotally connected to each slit-forming shutter blade in each group of shutter blades. These two levers in each group of shutter blades are connected to the slit-forming blades with pivots in a common plane and with these pivots on the blade spaced equally from the respective centers of rotation of the parallel levers. The parallel levers function in a parallel arrangement to maintain aperture-forming straight edges travelling across the exposure aperture of the shutter uniformly.
Abstract:
A device for making time settings and time corrections in a digital clock. The time-indicating elements other than the last time unit indicating element are preliminarily set to a time that is to be set in the clock. The clock driving circuit is prepared by manually opening a switch for disenabling thereof automatically when the least time unit time-indicating element assumes a selected position. The position of the least time unit element is sensed by a sensor and when it arrives at the selected position a second switch in parallel with the first-mentioned switch is automatically opened by the sensor so that the driving circuit is disenabled and the time indicated on the clock least time unit time-indicating element is retained. The driving circuit is enabled by manually controlling or closing of the first-mentioned switch upon coincidence of real time, as indicated by a time standard signal, with the time set into the clock. When the driving circuit is energized under manual control it automatically restores itself for the manual and automatic sequential operations necessary to automatically disenable it and enable it in making time settings and corrections.
Abstract:
A shutter-operating mechanism which has an actuating lever for actuating the shutter blades and a holding lever coaxially disposed. The holding lever is releasably held in a cocked condition by an electromagnet and cooperates with a driving cam, which drives the actuating lever and is pivotally mounted thereon, in shifting its point of rotation to a fixed fulcrum for effecting a planetary gear-like movement in actuating the shutter blades. The axis of the actuating lever and holding lever, the fixed fulcrum, and the point of contact of the holding lever and the driving lever in executing the shift of the point or axis of rotation of the driving levers lie in a common plane during the opening and closing of the shutter blades thereby reducing the sliding contact between elements and minimizing the loss of force due to friction.
Abstract:
A focal plane shutter of a camera having two sets or groups of blades. One set of shutter blades opens the shutter aperture and the second set of shutter blades closes the aperture. Both sets of shutter blades are actuated in the same direction for opening the shutter and closing it. The shutter blades are actuated by principal and supplementary driving members of respective driving mechanisms. Each driving mechanism has a principal or main driving lever that drives the shutter blades of a corresponding set of shutter blades except one which is driven stably and uniformly by a corresponding auxiliary driving member.
Abstract:
An electrically-operated shutter provided with a change-over device or arrangement for effecting daylight and flash photography automatically shifting from a daylight mode to a flash photography mode as a function of the detected brightness level of the field being photographed. One embodiment provides for manually presetting the camera for flash photography which is then automatically carried out with an automatic change-over from a daylight photography mode to a flash photography mode. When carrying out daylight photography the power source energy is used in control and in energizing an electromagnet that controls the exposure termination under control of a delay circuit. When taking flash exposure the delay circuit is not employed and a fixed exposure time is used. The power supply is then used to energize the flashbulb and the accuracy of the shutter timing is unaffected as might be the case if the power source were energizing both the flashbulb and driving or energizing the shutter. The same shutter-operating elements are used in both modes of operation and the change-over arrangement eliminates the use of the delay circuit when the brightness level is below a predetermined level so that flash photography becomes necessary.
Abstract:
A time-detecting system for a digital interval timer comprises a plurality of detecting wheels mounted for rotation independently of each other upon a detection shaft. The time-indicating wheels of the timer are also mounted for rotation independently of each other upon the detection shaft and each timing wheel is positioned on the shaft adjacent one of the detecting wheels. Each detecting wheel includes a set of projections which extend toward its associated timing wheel and each timing wheel has a corresponding set of holes for receiving therein the projections when the detecting wheels and timing wheels are angularly aligned with respect to each other. A biasing spring urges the detection shaft in one direction to force the detecting wheels against their associated timing wheels so that when the projections and holes on each set of wheels are in alignment, the biasing spring will force the detection shaft in one direction causing the projections to slide into their respective holes. The movement of the detection shaft thus provides an output indicating that the reference time set in the timer coincides with the actual time displayed by the time-indicating wheels.
Abstract:
An actuator device for use with an interval timer comprises a manually displaceable setting member displaceable between a nonworking position and a working position and a locking lever for releasably locking the setting member in its working position whereby an output device may be actuated by the setting member when same is moved into its working position. The setting member is biased into its nonworking position by a biasing spring and is maintained in its working position against the restoring force of the biasing spring by the locking lever. The locking lever is mounted for pivotal movement into a locking position in response to manual depression of the setting member to thereby prevent return movement of the setting member and is mounted for tilting movement to an unlocking position in response to either further manual depression of the setting member or in response to movement of an external output member to thereby permit the setting member to return to the nonworking position.
Abstract:
An electromagnetic control mechanism for an electric shutter of a camera. The shutter-operating mechanism is controlled by a biased control lever which is linked to the armature of an electromagnet that controls release of the control lever which releases the shutter-operating mechanism for closing the shutter. A pressure-applying member applies a biasing force or pressure to the armature urging it to its attracted position which is maintained by the electromagnet when energized prior to removal of this pressure force. The application of this pressure force eliminates any effect of ''''play'''' in the mechanical connection between the armature and the biased control lever, which is released by the electromagnet when de-energized, so that a smooth, positive and precise closing of the shutter is effected.
Abstract:
A focal plane shutter having a set or group of shutter-opening shutter blades and a set or group of shutter-closing shutter blades each consisting of a plurality of shutter blades for opening a shutter exposure aperture and closing it. Driving mechanism is provided for each group with a driving main lever supported on one side of the exposure aperture. A shutter blade operating auxiliary lever is supported on a corresponding one of the driving main levers and one end of this auxiliary lever is rotatably connected with a slit-forming shutter blade and a slot guides the travel of this end of the auxiliary lever to operate the slit-forming blade in parallel motion to define a uniform rectangular slit as the aperture is opened and closed.