Electric lamp and discharge devices – With optical device or special ray transmissive envelope – Polarizer or special ray transmission
Patent
1987-12-10
1989-06-06
Boudreau, Leo H.
Electric lamp and discharge devices
With optical device or special ray transmissive envelope
Polarizer or special ray transmission
313489, H01J 6116, H01J 6135
Patent
active
048374784
ABSTRACT:
The invention is concerned with an illuminator to radiate light rays in the near-infrared region, and a near-infrared ray image pick-up device which irradiates the near-infrared light radiated from this illuminator onto an object to be pictured, and captures light reflected from the object for image pick-up. By constructing the illuminator with an electric discharge lamp and a filter which removes the visible region and permit the near-infrared region to pass therethrough out of light rays radiated from this electric discharge lamp, there can be provided a near-infrared ray radiation illuminator having a high efficiency and low deterioration characteristic. And, at the same time, by constructing a near-infrared ray image pick-up device with this near-infrared ray radiation illuminator and an image pick-up device which captures reflected light of the near-infrared ray radiated from the illuminator to be irradiated onto the object for the image pick-up, the image pick-up can be done without notice of a human being, whereby, when the device is used as a crime-preventing monitoring device, the monitoring of an intruder can be done perfectly, and, when it is used as a visitor congnition device, there is no disagreeable feeling on the part of the visitor by his being dazzled by illuminating light or his knowledge of being pictured by the device.
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Anzai Yoshinori
Saikatsu Takao
Saito Masato
Tsuchihashi Michihiro
Boudreau Leo H.
Mitsubishi Denki & Kabushiki Kaisha
Wieder K.
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