Abstract:
TURE SETTING MEMBER IS ALSO SET TO SETTING WHICH REPRESENTS THE DIFFERENCE BETWEEN A MAXIMUM SETTING AND A PRE-SET SETTING IN ACCORDANCE WITH THE ROTATION ANGLE OF A ROTATABLE RING IN THE LENS BARREL OF THE CAMERA.
A SHUTTER CONTROL IS ADJUSTABLE TO THE LOWEST SPEED THAT WILL PROVIDE A NON-BLURRED PHOTOGRAPH WHEN A SHUTTER SPEED SETTING MEMBER IS POSITIONED AT AN AUTOMATIC EXPOSURE POSITION WHEREIN THE EXPOSURE SETTING IS DETERMINED AS A FUNCTION OF SHUTTER DIAPHRAGM APERTURE AND FILM SPEED SETTINGS. THE VIEWFINDER DISPLAYS BOTH INDICATIONS OF THE INTENSITY OF LIGHT AND THE EXPOSURE CONDITION SET BY THE SHUTTER CONTROL APPARATUS. THE DIAPHRAGM APER-
Abstract:
In a motor-driven system for a still camera provided with a motor for advancing a film and cocking the shutter, with an electromagnet for controlling the shutter and with a network for controlling said motor and said electromagnet, an electronic circuit portion of the network is fed by one battery having a substantially constant-voltage but of small capacity, such as a mercury battery, and the electromagnet and the motor are fed by another battery of larger less expensive capacity, but having a voltage characteristic less constant than the one battery, such as manganese battery, so that the delicate electronic circuit portion has a substantially lengthy operating period.
Abstract:
An exposure control circuit is caused to store a voltage representative of the light intensity of a selected principal object within the object field to be photographed by a manually operated member which disconnects a photosensitive element from a capacitive storage element. Operation of the manual member causes a switch interconnecting the photosensitive element with the capacitive storage element to be opened and a restraining member is provided for maintaining the switch in an opened condition until an exposure has been terminated. A cocking member operated in conjunction with the cocking of the camera causes the switch to be closed in preparation for another photograph.
Abstract:
In a still camera having a motor for advancing a film, the motor is actuated by means of a trigger-signal which is to be produced after an adjusted delay time after deenergization of an electromagnet for holding a previously opened shutter in the open state to the start of rotation of the motor. By adjusting the pause time appropriately, the film starts advancing without redundant delay, thereby enabling the efficient consecutive taking of many pictures over a predetermined period of time.
Abstract:
An automatic exposure control device for a photographic camera provided with an exposure control circuit including a light receiving element receiving the scene light passing through an objective lens and a diaphragm, and operating in accordance with photographic conditions such as the generated current of said light receiving element, the set shutter speed and the set film sensitivity in the camera, an electromagnetic coil whose magnetic field varies according to the output of said exposure controlling circuit, and a retaining member retaining the diaphragm in a fully open state so biased that the aperture will be reduced from its fully open condition. While closing the switch of the exposure controlling circuit prior to the shutter is initiated for actuating the exposure controlling circuit, releasing the retaining member thereby causes the diaphragm to start reducing the aperture size and when the brightness of the scene light passing through said objective lens and the diaphragm becomes the correct value with respect to the set shutter speed and the set film sensitivity, the diaphragm aperture is prevented from being reduced according to the variation of the magnetic field of said electromagnetic coil for controlling the diaphragm aperture.
Abstract:
A single lens reflex camera having a pentagonal prism view finder is provided with an additional prism disposed on the rooftype reflection surface of the pentagonal prism. The light rays from exposure condition information indicating devices such as a diaphragm opening indicator and a range finder may be caused to fall upon the pentagonal prism, through the additional prism. The light rays are reflected on the front lower reflection plane of said pentagonal prism which directs the rays to an eyepiece so that the exposure condition information is visible in the vision field of the finder.
Abstract:
A photographic camera capable of making multiple exposures on a single film frame, the camera being of the type in which the advance of a single frame of film and the cocking of the shutter are effected by a single winding operation. The camera is provided with a first gear member rotatable for transmitting the rotary movement of the winding operation to a cocking member of the shutter, a second gear member rotatable for transmitting the rotary movement of the winding operation to a film winding spool through a friction clutch means, a third gear member rotatable for transmitting the rotary movement of the winding operation to a film transporting sprocket by way of a clutch means, a push button member actuatable for disconnecting the clutch means, and a blocking member for maintaining the clutch means in the disconnected condition and blocking the rotation of the film winding spool in the forward film winding direction against the action of the friction clutch means. The camera may be placed in a condition ready for double exposures simply by pressing the push button member, and after completion of the shutter cocking, the film winding spool is automatically relieved from the blocking action of the blocking member and the clutch is connected for associating the shutter cocking mechanism again with the film winding mechanism.
Abstract:
Switching mechanism in an exposure control device for a photoconductive camera reduces unnecessary battery consumption by disconnecting the power source from a light measuring circuit and a mechanism for actuating shutter closing during those times when either the output of the light measuring circuit and/or the actuation of the shutter are not required. Manually operative individual switches respectively interconnect the light measuring circuit and the shutter actuation mechanism with the power source. A button switch movable between first and second positions engages with a locking member to prevent actuation of the shutter release button to prevent interconnection of the shutter actuating mechanism with the power source when an exposure time setting member is set to an automatic exposure position and the button switch is in the first position for opening the switch interconnecting the light measuring circuit with the battery source. Rotation of the exposure time setting member to any one of a number of positions rotates the locking member enabling the release button to be depressed and the interconnection of the shutter actuating mechanism with the battery source.
Abstract:
A shutter speed indication device comprises a following pointer coaxially rotated with the meter pointer and interlocking with a shutter speed setting dial for setting manual and automatic exposure time control to indicate the limit of the exposure time within which camera movement will not affect the taking of a photograph.