OPTICAL DENSITY DETERMINATION METHODS AND APPARATUS
First Claim
1. An optical density determination apparatus comprising:
- a first light source configured to emit a first light beam in a first direction towards a substrate;
a second light source configured to emit a second light beam in a second direction towards the substrate, the second direction being different than the first direction;
a first sensor configured to sense light of the first light beam reflected from the substrate;
a second sensor configured to sense light of the second light beam reflected from the substrate; and
wherein the first and second sensors are configured to provide signals indicative of the light sensed by the first and second sensors and which are useable to determine optical density of the substrate.
1 Assignment
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Accused Products
Abstract
At least some aspects of the disclosure are directed towards densitometers and methods of determining optical density of printed images upon media. According to one example, an optical density determination apparatus includes a first light source configured to emit a first light beam in a first direction towards a substrate; a second light source configured to emit a second light beam in a second direction towards the substrate, the second direction being different than the first direction; a first sensor configured to sense light of the first light beam reflected from the substrate; a second sensor configured to sense light of the second light beam reflected from the substrate; and wherein the first and second sensors are configured to provide signals indicative of the light sensed by the first and second sensors and which are useable to determine optical density of the substrate.
6 Citations
15 Claims
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1. An optical density determination apparatus comprising:
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a first light source configured to emit a first light beam in a first direction towards a substrate; a second light source configured to emit a second light beam in a second direction towards the substrate, the second direction being different than the first direction; a first sensor configured to sense light of the first light beam reflected from the substrate; a second sensor configured to sense light of the second light beam reflected from the substrate; and wherein the first and second sensors are configured to provide signals indicative of the light sensed by the first and second sensors and which are useable to determine optical density of the substrate. - View Dependent Claims (2, 3, 4)
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5. An optical density determination apparatus comprising:
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a densitometer comprising a face plane configured to emit a light beam towards a substrate and to receive light of the light beam which was reflected by the substrate, and wherein the densitometer is configured to provide a signal indicative of optical density of the substrate as a result of the received light; and a support configured to position the densitometer in a configuration with the face plane tilted with respect to the substrate along at least one axis wherein the densitometer emits the light beam towards the substrate at a different angle with respect to a substrate normal vector compared with an arrangement where the face plane is substantially parallel with the substrate. - View Dependent Claims (6, 7, 8, 9)
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10. An optical density determination method comprising:
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using a first light source, emitting a first light beam in a first direction towards a substrate; using a second light source, emitting a second light beam in a second direction towards the substrate, the second direction being different than the first direction; sensing light of the first light beam reflected from the substrate; sensing light of the second light beam reflected from the substrate; and using the sensed light of the first and second light beams, determining optical density of the substrate. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification