Patent application number | Description | Published |
20100091286 | Filter Design for Colorimetric Measurement - A color detector includes a light source configured to generate light with a spectrum of wavelengths; a plurality of filters in optical communication with the light source, wherein each filter is configured to pass a bandwidth of wavelengths around a different peak wavelength; and a plurality of photodetectors, each configured to receive light passed through a respective filter of the plurality of filters. The bandwidth of each filter is configured to Correspond to a bandwidth of a curve from a set of standard color matching functions. A method for improving color detection accuracy in a color detector includes matching a bandwidth passed by each of a plurality of color filters with a bandwidth and peak wavelength of a Commission Internationale de I'Eclairage (CIE) color matching function; and separately detecting an amount of light passed by each the filter. | 04-15-2010 |
20100321694 | COLOR DETECTOR HAVING AREA SCALED PHOTODETECTORS - A color detector includes a light source, a filter, and a photodetector. The photodetector outputs a signal proportional to the amount of a predetermined color of light that passes through the corresponding filter. When used in an array, each filter may have different transmission characteristics, and each color signal may have a different magnitude and/or signal-to-noise ratio. This may be corrected for by adjusting the area of each of the photodetectors and corresponding filters. In other words, the areas if the photodetectors may be configured to equalize the color signal of a reference color and thereby maximize the signal-to-noise ratio of the color signals the sensor is intended to measure. The area of the photodetector may be based on a response curve of the photodetector as a function of wavelength, a response curve of the filter as a function of wavelength, and the amount of light as a function of wavelength generated by the light source, among other factors. | 12-23-2010 |
20110007302 | Hard copy re-emission color measurement system - Hard copy re-emission color measurement system, comprising a light arrangement for emitting light onto a hard copy, a light detector arranged to detect light re-emitted by the hard copy, and a control circuit configured to process the detected re-emitted light. The light arrangement is arranged to separately and simultaneously emit a first light having wavelengths longer than an ultraviolet wavelength and a second light having wavelengths in the ultraviolet range. The light arrangement is provided with a light guide arranged to guide the first and second light on an at least partly overlapping region on a hard copy. | 01-13-2011 |
20110096343 | IDENTIFYING A COLOR PROFILE FOR AN ILLUMINANT - A method includes collecting, within a printer body, ambient light entering the printer body. Characteristics of the collected ambient light are measured. A color profile based on the measured characteristics is identified. The identified color profile is provided for use in forming a color image on a medium. | 04-28-2011 |
20110211196 | COLOR MEASUREMENT DEVICE - A color measurement device includes a light pipe and a light source. The light pipe is oriented length-wise towards a color sample surface along a first axis that is non-perpendicular to the surface. A color sample is positioned on the surface. The light pipe has a near opening, a far opening, and a face at the far opening. The near opening is closer to the color sample than the far opening. The light source is positioned near the far opening of the light pipe, and is to output light along a second axis and into the light pipe at the far opening. The light reflects off the surface after exiting the light pipe at the near opening. The second axis is non-perpendicular to the face of the light pipe at the far opening. The light non-uniformly illuminates the color sample after exiting the light pipe at the near opening. | 09-01-2011 |
20110310389 | COLOR SENSOR - A color sensor array includes a plurality of sensors. Each of the plurality of sensors has a width dimension and a length dimension that is elongated with respect to the width dimension. The length dimensions of the sensors are substantially equal to one another and parallel to an illumination plane. Each of the plurality of sensors includes a face defined by opposing first and second elongated sides and opposing first and second non-elongated sides. The first non-elongated sides of the plurality of sensors are aligned with one another along an axis that is substantially perpendicular to the illumination plane. | 12-22-2011 |
20120013906 | GRIN LENS ARRAY LIGHT PROJECTOR AND METHOD - One aspect is a light source assembly in a drop detection arrangement. The light source assembly includes a light source and a gradient-index lens array to at least partially collimate light from the light source and to project a collimated light beam into the drop detection arrangement in a direction transverse to a drop direction of droplets in the drop detection arrangement. The light source assembly produces the light beam such that it has a beam width in a direction transverse to the drop direction that is larger than a beam height in the drop direction. | 01-19-2012 |
20120038923 | COLLECTION OPTICS FOR A COLOR SENSOR - An optical system includes a lens, a pupil relay, and an aperture stop positioned at a focal point of the lens between the lens and the pupil relay. The lens is configured to collect a plurality of light bundles. Each light bundle emanates from a field point of an object plane and has a center ray substantially parallel to an optical axis of the lens. The lens is configured to direct the center ray of each light bundle through the aperture stop and onto the pupil relay. The pupil relay is configured to image a plane of the aperture stop onto a sensor array. | 02-16-2012 |
20130148124 | COLOR SENSING DEVICE - A color sensing apparatus ( | 06-13-2013 |
20140078213 | DROP DETECTOR - In one example, a drop detector includes a light source for illuminating drops passing through a drop zone, multiple light detectors near the light source for detecting light scattered off drops passing through the drop zone, and multiple lenses each configured to focus light from the drop zone on one of the light detectors. In one example, each light detector is arranged in the same plane with all of the other light detectors. In one example, the lenses are configured to focus light from two different spaces in the drop zone on different detectors or groups of detectors. In one example, the lenses are configured to focus light from a single space in the drop zone on multiple detectors. | 03-20-2014 |