Konishiroku Photo Industry Co., Ltd.

Kunio Nakajima

Michio Yagi

Kazuhisa Aratame

Yasutsugu Nakagawa

Kaneo Saito

Haruhiko Momose

Saburo Yoneyama

Takehiko Hamaguchi

Sizuo Ishii

A single lens reflex camera is provided with a photocell so positioned in the camera as to receive thereon light incident through the lens and reflected onto the photocell by the mirror. During each photographing operation, the mirror is pivotally elevated so that the incident light is no longer received by the photocell. The camera electronics monitors the photocell output which is representative of the magnitude of light received by the photocell and, unless a relatively rapid change in photocell output is detected during a photographing operation, an alarm is actuated to indicate failure of the mirror to properly pivot.

Single lens reflex camera equipped with mirror elevation detector and

An automatic film feeding apparatus for a camera includes a first switch operable in response to the opened or closed position of the camera rear cover, a second switch operable in response to the position of a film counter, a third switch operable in accordance with the position of a film strip in a camera, and an electronic control circuit for operating a film winding motor drive mechanism in response to predetermined states of the first, second, and third switches.

Automatic film feeding apparatus for photographic camera

Disclosed is an apparatus adapted to be used in a single lens reflex camera for detecting whether a correct focal adjustment has been made. The apparatus includes a pair of focal point detecting optical systems placed relative to each other on symmetrical positions with respect to an extending optical axis which is turned by an optical reflecting means, at the rear of a semitransparent movable mirror. A position where an image of an object on a main optical axis of the object lens, is focused by said object lens when an observing point of the object is placed in a position with an infinity distance, is determined as a basic point. The optical axes of said pair of focal point detecting optical systems cross with each other at said basic point. A photo-electric detecting plate is arranged in the vicinity of a film surface. A position on said detecting plate where an image of the object on said basic point is projected by said focal point detecting optical systems is determined as a cardinal point. A correct focusing is detected electrically when the observing point of the object is projected onto said cardinal point.

Apparatus for detecting focal point

A motor driving device for a camera is provided in which the motor is placed in an energizing circuit which includes a governor. A switch is provided in parallel with the governor and is adapted to be operated by a relay. When the switch is opened, the governor can effectively control the speed of the motor in order to prevent overrunning of the film during the winding operation. When the switch is closed, the governor is short-circuited and the motor can run to wind the film or control exposure.

Growing community of inventors

Hachioji, Japan

Kunio Nakajima