Asahi Kogaku Kogyo Kabushiki Kaisha

Chiharu Mori

Masahiro Kawasaki

Tetsuji Shono

Fumio Urano

Naoyuki Uno

Kunio Mita

Hirokazu Ando

A shutter speed digital display device for cameras equipped with both automatic and manual shutter speed controls is disclosed. A shutter speed display control circuit generates a first digital signal in accordance with the adjustment of the camera's shutter speed by an automatic shutter speed control circuit. The first digital signal is decoded and used to control a light-transmitting liquid crystal device display. In addition, when the camera is in a manual mode of operation, the first digital signal is compared with a second digital signal related to manually adjusted shutter speed. If the comparisons are equal, a coincidence indicator is energized.

Shutter speed digital display device for cameras

An exposure meter circuit is disclosed in which the photoreceptor may be either a photovoltaic element such as a photodiode or a photoconductive element such as a CdS element. The meter is able to provide an indication of various exposure determining factors such as object brightness, shutter speed, aperture, or a fixed point for alignment by appropriate choice of circuit values.

Exposure meter circuit

An electrical system to be used in a camera for controlling exposure time. The electrical system includes a pair of substantially identical constant voltage sources respectively having inputs connected together. A buffer circuit is coupled between an interconnection of these inputs and the collector of a compression transistor to which a photosensitive means is connected and whose base is coupled to one of the constant voltage sources. A timing circuit is coupled to an expansion transistor, whose base is coupled to the other of the constant voltage sources.

Growing community of inventors

Tokyo, Japan

Chiharu Mori