Registers – Coded record sensors – Particular sensor structure
Patent
1983-07-27
1989-04-04
Trafton, David L.
Registers
Coded record sensors
Particular sensor structure
235462, 235472, 235465, 250566, 250553, G06K 710
Patent
active
048188476
ABSTRACT:
Apparatus for optically reading printed information by radiating light onto printed information to be reflected thereby, receiving the reflected light through an optical system and converting the image of the reflected light into a corresponding electric signal. The light source employs red light emitting diodes which radiate highly bright red light having a wavelength peak at about 660 nm so that the image sensor can receive a highly contrasting reflected light from the information printed in black on a white base. The light source further or alternatively employs infrared light emitting diodes for radiating the light having a peak wavelength at about 925 nm so that the image sensor can also received a highly contrasting reflected light from information printed in black on a blue or green base.
REFERENCES:
patent: 3684868 (1972-08-01), Christie et al.
patent: 3911270 (1975-10-01), Traub
patent: 4101784 (1978-07-01), Key et al.
patent: 4210802 (1980-07-01), Sakai
patent: 4315245 (1982-02-01), Nakahara et al.
patent: 4408120 (1983-10-01), Hara et al.
patent: 4440248 (1984-04-01), Teraoka
Hara Masahiro
Okamoto Atutoshi
Oshima Tadao
Sakai Toshiyasu
Takai Hiromitsu
Nippondenso Co. Ltd.
Trafton David L.
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