Minolta Camera Kabushiki Kaisha

Mikio Uematsu

Yoshihiro Okui

Kazuhiko Naruse

Hiroshi Furukawa

Norihisa Hosoi

Izumi Horie

Shinji Shimizu

Taketoshi Kawamura

Seiki Yamaguchi

A photographic color temperature meter capable of measuring light including stationary light and flash light. The meter controls timing of light measurements so that light measurement is performed during the time when stationary light and flash light are included and when only stationary light is included. Thereafter, calculation of color temperature only of flash light is performed.

Color temperature meter for use in photographing

A light measurement device includes a photoelectric converter for receiving light from an object to be measured and converting the light to a measuring electrical energy in accordance with the intensity of the light, an offset amount measurement device for measuring the offset amount of the photoelectric converter, temperature measurement device for measuring a first temperature of the photoelectric converter when measuring the offset amount, and a second temperature of the photoelectric converter when measuring the light from the object, a memory device for storing a characteristic of the photoelectric converter with respect to temperature, correction amount calculation device for calculating a correction amount based on the characteristic, the first temperature, and the second temperature, and a light intensity calculation device for calculating a light intensity based on the measuring electrical energy, the offset amount, and the correction amount.

Light measurement device

Growing community of inventors

Osaka, Japan

Mikio Uematsu