Infrared reflectance densitometer

Details Infrared reflectance densitometer Infrared reflectance densitometer

1983-08-24

1985-11-12

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250341, 355 14D, 356445, G01N 2147, G03G 1508

Patent

active

045530335

ABSTRACT:
An integral, compact infrared reflectance densitometer including a substrate supporting an LED, a control photodiode to compensate for component degradation, a background photodiode to compensate for background radiation, and a large area photodiode to provide an electrical signal representative of the amount of toner particles on the photosensitive surface. Also carried on the substrate is a field lens to focus light rays reflected from the photosensitive surface onto the signal photodiode. The substrate is precisely secured to a molded housing having integral collector and collimating lenses. Four extending pins on the housing engage four apertures on the substrate to locate the substrate with respect to the housing and align the LED and field lens carried on the substrate with the collector and collimating lenses of the housing. Also carried on the substrate is an aperture box to permit a portion of the LED light to project through the collimating lens to the photosensitive surface and a portion of the light to be reflected onto the control photodiode to control light output. The light rays reflected from the photosensitive surface are gathered in a collector lens and projected through the field lens to be focused onto the signal photodiode. An L-shaped clip and an appendage with an elongated aperture extend from opposite ends of the housing to position and align the infrared reflectance densitometer in the reproduction machine with respect to the photosensitive surface.

REFERENCES:
patent: 3659556 (1972-05-01), Mutschler
patent: 3712203 (1973-01-01), Kishi et al.
patent: 3756192 (1973-09-01), Locklar et al.
patent: 3830401 (1974-08-01), Benwood et al.
patent: 3854050 (1974-12-01), Peterson et al.
patent: 4146325 (1979-03-01), Lange
patent: 4207467 (1980-06-01), Doyle
patent: 4457615 (1984-07-01), Seanor
patent: 4458152 (1984-07-01), Bonora
Troy et al., "Reducing Stray Light Errors in the Hunter Multipurpose Reflectometer", J. Opt. Soc. Am., 40 (2), Feb. 1950, pp. 80-82.

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