Seikosha Co., Ltd.

Yuji Nakajima

Shinji Nagaoka

Hiroshi Yamazaki

Shigeru Tagami

Koji Sato

Seiichi Imano

Teruyo Hayakawa

Tomihiko Aoyama

Isamu Ishii

A camera has a shutter which may also constitute a diaphragm. In a multi-flash mode the shutter selectively has a maximum aperture at an onset or at the end of the time base. The flash occurs in synchronism with a shutter waveform shaped by this aperture area and a time base element. In a second embodiment, a second diaphragm setting circuit is provided, in diaphragm priority photography, for computing a measurement value of a distance to a subject and a second diaphragm value from the guide number during an emission of flashed light. The diaphragm is set to the computed second diaphragm value, ad an electronic flash is energized with a desired aperture area. The diaphragm is set to an initial value to effect the photography at a time other than during the emission of flashed light. A timing circuit may be provided for setting the diaphragm to the second diaphragm value. The aperture area may be increased or decreased for diaphragm matching with the quantity of flashed light and the distance to the subject during diaphragm priority flash photography.

Flash synchronizing device

A range meter for a camera has a plurality of irradiation sources for irradiating beams in different directions, and a plurality of receivers for receiving reflected irradiation, the receivers providing outputs responsive to the point of the respective receiver that receives irradiation. In order to adapt the meter for measurement in different distance ranges, the outputs of the receivers are sensed in response to irradiation from different sets of the sources.

Range meter for camera

A distance measuring system for a camera includes a plurality of light sources arranged in a row, and a receiver for receiving light reflected from a subject. The receiver outputs a signal corresponding to the position thereon at which light is received, and is a function of the direction of propogation of the light from its source and the distance to the object. The distance to the subject is calculated from the output of the receiver. The sources are selectively energized by manual control so that the system is adaptable for measurement in a plurality of different distance ranges. A display may be provided to mark a spot on an image of the subject, to enable the user to determine the subject that had been used for the distance determination.

A range meter for a camera includes a row of light sources for propagating light to a subject from different directions, and a receiver for receiving reflected light. The receiver provides an output corresponding to a spot thereon at which light is received. The light sources are energized selectively, so that the light sources at the end of the row emit less than the light sources at the center of the row.

A range finder for use with a still camera and the like, projects an infrared light beam to an object and the light beam reflected from the object is detected by a split photosensor. The photosensor is made up of two photodiodes connected in opposite polarity relationship so that a differential photocurrent produced by the diode pair is amplified. The reflected light beam is tracked so that the photosensor provides a zero output, and the distance to the object is determined from the time needed to detect the zero photosensor output.

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Chiba, Japan

Yuji Nakajima