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1. (WO2018198674) LIGHT MEASUREMENT DEVICE

Pub. No.:    WO/2018/198674    International Application No.:    PCT/JP2018/013729
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Sat Mar 31 01:59:59 CEST 2018
IPC: G01J 1/42
G01J 1/44
G01J 3/50
G01M 11/00
Applicants: KONICA MINOLTA, INC.
コニカミノルタ株式会社
Inventors: MASUDA Satoshi
増田 敏
Title: LIGHT MEASUREMENT DEVICE
Abstract:
The present invention broadens the brightness range that can be measured by a light measurement device without making the light measurement device more complicated. In this light measurement device, a light sensor receives light from a display and outputs a photocurrent corresponding to the light. An integrator continuously integrates the photocurrent over time and outputs an integrated signal. A required measured value accuracy, approximate light brightness, and period of variation in light brightness and color over time are acquired. An exposure time is determined from the required accuracy and the approximate brightness. An integration time is determined such that the integrator is not saturated and the exposure time is a common multiple of the period and integration time. The integrator is controlled such that an exposure period includes at least one integration period, the length of the exposure period is the determined exposure time, the individual length of at least one integration period is the determined integration time, and the integrator integrates the photocurrent in at least one integration period and outputs at least one integrated signal for each integration period. A measured value is calculated from the at least one integrated signal.