Adaptive sensor and interface

Details Adaptive sensor and interface Adaptive sensor and interface

1996-10-07

1998-05-12

Evans, F. L.

Optics: measuring and testing

Of light reflection

With diffusion

399389, G01N 2147

Patent

active

057514437

ABSTRACT:
A sensor detects the presence of opaque and transparent copy substrates in a substrate transporting path and includes an LED disposed near the transporting path for projecting light toward a reflector on the opposite side of the media transport path and a phototransistor located relative to the LED and reflector to receive light reflected from the reflector which is periodically interrupted by substrates within the transporting path to provide an output proportional to the light received from the LED via the reflector. The operating range of the phototransistor has a linear portion and a saturated portion. A control, electrically connected to the sensor, adjusts the phototransistor to maintain the output signal in the linear portion of the operating range. The sensor is tilted at an angle with respect to the horizontal of a copy substrate to be able to detect transparencies.

REFERENCES:
patent: 3832065 (1974-08-01), Sullivan et al.
patent: 4730932 (1988-03-01), Iga et al.
patent: 4922090 (1990-05-01), Turra et al.
patent: 5139339 (1992-08-01), Courtney et al.
patent: 5329338 (1994-07-01), Merz et al.
patent: 5354995 (1994-10-01), Endo et al.
patent: 5467194 (1995-11-01), Pellinen et al.

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