Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1990-07-10
1992-06-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2504841, 358138, H01J 4014
Patent
active
051226510
ABSTRACT:
A device for measuring a luminance of a fluorescent screen of a cathode ray tube includes a photoelectric conversion device for receiving light from the fluorescent screen and converting the light to electrical energy, an integral device for integrating the electrical energy, a measurement device for measuring the glowing interval time of the cathode ray tube, and a control device for controlling the integral device so as to integrate the electric energy for a general integral time corresponding to the interval time. Also, this device has a calculation device for calculating an offset integrated electrical energy corresponding to a bias component of the photoelectric conversion device, another calculation device for calculating a true integrated electrical energy by subtracting the offset integrated electrical energy from the measured general integrated electrical energy.
REFERENCES:
patent: 4933558 (1990-06-01), Carter et al.
patent: 5032769 (1991-07-01), Kawakami
Brochure of the Minolta Camera Co. disclosing a TV Color Analyzer II, at p. 11, Apr. 1989.
Furukawa Hiroshi
Naruse Kazuhiko
Okui Yoshihiro
Allen S.
Minolta Camera Kubushiki Kaisha
Nelms David C.
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