Apparatus for measuring the reflectance of strips having non-uniform color
First Claim
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1. A reflectance gauge, comprising:
- a housing;
a circuit board mounted inside the housing;
a plurality of discrete illumination sources oriented in a predetermined pattern and mounted on the circuit board;
a slit formed in the circuit board;
an optical detector array mounted beneath the circuit board;
a first mirror coupled to the housing below the slit;
a focusing lens adapted to receive light from the first mirror;
a second mirror mounted below the circuit board and positioned to direct light from the focusing lens to the optical detector array.
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Abstract
An optical system for measuring the reflectance of flat strips having potentially optically non-uniform surfaces. In one embodiment the systems includes an array of discrete light sources, wherein each light source is driven by its own individual current, such that the pattern reflected onto a photodector is substantially uniform in intensity.
23 Citations
19 Claims
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1. A reflectance gauge, comprising:
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a housing; a circuit board mounted inside the housing; a plurality of discrete illumination sources oriented in a predetermined pattern and mounted on the circuit board; a slit formed in the circuit board; an optical detector array mounted beneath the circuit board; a first mirror coupled to the housing below the slit; a focusing lens adapted to receive light from the first mirror; a second mirror mounted below the circuit board and positioned to direct light from the focusing lens to the optical detector array. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A reflectance gauge comprising:
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a circuit board having a top side, a bottom side, and a slit formed therethrough; a plurality of LEDs mounted in a predetermined pattern to the top side of the circuit board; an optical detector array mounted to the bottom side of the circuit board; a flat optical sample mounted above the circuit board and positioned to reflect light shining from the LEDs through the slit; and a pair of mirrors mounted below the circuit board and positioned to direct light from the slit to the detector; wherein each LED is driven by an independent predetermined current and wherein the light shining from the set of LEDs forms an emission pattern. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An optical measurement device, comprising:
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a flat optical sample; an LED array having a predetermined pattern adapted to illuminate the flat optical sample; and an optical detector array positioned to receive light from the LED array reflected by the flat optical sample; wherein each LED is driven by an independent predetermined current and wherein the flat optical sample is illuminated to reflect light with substantially constant intensity onto the optical detector array. - View Dependent Claims (16, 17, 18, 19)
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Specification