摘要:
An electromagnetic device for driving a shutter includes a moving coil which is arranged to rotate in the magnetic field of a stator. A current supply arrangement for supplying exciting current to the moving coil includes a pair of insulated side pieces fixed about the rotational axis of the coil and connected to both terminals of the moving coil, and a pair of elastic rod-shaped brushes pressed against the side pieces on diametrically opposite sides of the rotational axis. A slide surface on each slide piece is provided with at a pair of flatened portions against which the elastic rod-shaped brushes are pressed so as to hold the shutter blades at a stop position.
摘要:
In the disclosed camera, a switchover arrangement automatically shifts from an automatic exposure mode to a flash mode in response to a charge completion signal from a flash device. A line electrically connects a terminal capable of receiving the charge completion signal from the flash unit to the switchover arrangement. A switch connected to the connecting line applies a signal of a value corresponding to the charge completion signal from a signal source in the camera to the switchover arrangement to cause the latter to effect a switchover to the flash mode in response thereto in the same manner as when a charge completion signal is applied thereto.
摘要:
In a slit exposure shutter having leading and trailing blades driven to run down to make an exposure and to return to their initial positions by an electromagnetic drive source, this source is provided with electromagnetically operated latch means for holding the leading and trailing blades in either one of the terminal ends of running down and returning movement thereof. Another feature is that the above-described latch means is constructed by utilizing the magnetic attraction force of at least one of the stationary and movable electromagnetic members of the drive source.
摘要:
A slit exposure shutter which has an electromagnetic drive source and is arranged to have shutter blades moved by rotation of a rotor not exceeding a half turn to perform exposure effecting and returning travels. The weight of the shutter blades and that of the rotor are arranged to be approximately in balance by having the rotation shaft of the rotor eccentrically disposed in a position deviating from the center of the rotor.
摘要:
In making reflection mirrors for optics, a technique is provided for making up a reflection mirror not of a glass-system material but of metallic material, and a method for high-precision mirror-machining of a metal plate is also disclosed.
摘要:
A camera having an electromagnetic driving source for operating a focal plane shutter in the camera, includes a shutter base plate and a driving arm pivoted on the base plate for swinging movement in a plane parallel to the plate. A group of thin shutter blades are supported on the driving arm parallel to the surface of the base plate. The output shaft of a motor is coupled with the driving arm, and either one of the rotor of the motor, or a permanent magnet forming a part of the stator of the motor, provides magnetic flux parallel to the axis of the output shaft, thereby causing the rotor to rotate the output shaft and drive the focal plane shutter.
摘要:
A slit exposure shutter having the front and rear screens thereof respectively arranged to be driven by a source of an electromagnetic driving force is provided with a minimum slit width insuring means which prevents uneven exposure resulting from difference in travelling speed between the front and rear shutter screens during a high speed shutter operation and particularly prevents a total absence of the slit, the shutter is also provided with a nullifying means which nullifies the insuring means when the shutter screens are on their return travels.
摘要:
An exposure control device for a single lens reflex camera has an exposure calculating mechanism for determining the amount of exposure in accordance with desired shutter time, aperture value, film sensitivity and brightness of the object to be photographed. The exposure calculating mechanism is carried along one external wall of a casing for the reflex mirror of the camera.
摘要:
A winding device is provided with a first guide roller for bringing the tongue of the film into contact with a frictional member on the outer periphery of a takeup spool, and a second guide roller for conforming the film tongue to the takeup spool when the film is wound on the takeup spool by almost one turn, wherein the free end portion of a support plate for the second guide roller is extended concentrically to the pivot shaft of the support plate.
摘要:
A focal plane shutter mechanism for a single lens reflex camera has its shutter blades driven by an electromagnetic driving source, with setting of shutter blades to their running start positions being mechanically effected in association with mirror driving means thereby diminishing power consumption, and with the shutter blades being electromagnetically driven only during a film exposure.