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US 9,175,985 B2Granted
Hybrid photodetector
AssigneeHewlett-Packard Indigo B.V.
InventorsEli Velner, Moshe Porat-Forshlager, Bar-Navi Michael
Life of this patent
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Abstract
A hybrid photodetector employing both transmissive and reflective detection techniques for detecting objects having differing light transmission and reflection properties are in conveyance.
Claims20
A hybrid photodetector comprising:
- a light source to direct a light beam across a travel path of an object;
- a transmission sensor to receive the light beam and to output a transmission-sensor voltage responsive to changes in the received light beam, the changes in the received light beam being caused by the object diminishing propagation of the light beam across the travel path;
- a reflection sensor to receive a reflection of the light beam from the object and to output a reflection-sensor voltage responsive to changes in the received reflection of the light beam from the object;
- and
- circuitry to combine the transmission-sensor voltage and the reflection-sensor voltage into a composite voltage.
2 more elements
A printing system for printing on substrates having differing light transmission and reflection properties;
- the system comprising:
- a conveyer system;
- and
- a hybrid photodetector operatively linked to the conveyer system, the photodetector including:
- a light source to direct a light beam across a travel path of a substrate being conveyed on the conveyor system,
- a transmission sensor to receive the light beam and to output a transmission sensor voltage responsive to changes in the received light beam, the changes in the received light beam being caused by the substrate diminishing propagation of the light beam across the travel path,
- a reflection sensor to receive a reflection of the light beam from the substrate and to output a reflection sensor voltage responsive to changes in the received reflection of the light beam from the substrate;
- and
- circuitry to combine the transmission sensor voltage and the reflection sensor voltage into a composite voltage.
6 more elements
A method of detecting substrates having differing light transmission and reflection properties, the method comprising:
- directing a light beam from a light source across a travel path of a substrate;
- receiving the light beam in a transmission sensor;
- outputting, from the transmission sensor, a transmission-sensor voltage responsively to a diminishment of intensity of the light beam received by the transmission sensor when the substrate begins to traverse the light beam;
- receiving a reflection of the light beam from the substrate in a reflection sensor;
- outputting, from the reflection sensor, a reflection-sensor voltage responsively to a change in the reflection of the light beam from the substrate;
- and
- combining the outputted transmission-sensor voltage and the outputted reflection-sensor voltage into a composite voltage.
4 more elements
Dependencies are inferred from the claim text.