1
Mark M Butterworth, Rene P Helbing: Fluorescent dye added to epoxy of light emitting diode lens. Hewlett Packard Company, December 8, 1998: US05847507 (173 worldwide citation)

A process and apparatus is described to produce efficient light emission over a broad portion of the visible spectrum. A lens containing a fluorescent dye is over molded to a short wavelength light emitter (e.g., a blue LED or laser diode) placed within a reflector cup. The fluorescent dye absorbs a ...


2
Mark M Butterworth: Sensor array and illumination system for a large depth-of-field bar code scanner. Hewlett Packard Company, April 23, 1991: US05010241 (113 worldwide citation)

An improved sensor array and illumination scheme for a bar code scanner use a modified Scheimpflug arrangement optical system that simplifies signal processing. The preferred embodiment includes a detector array comprising a multi-element array of photosensors positioned in one Scheimpflug plane and ...


3
Mark M Butterworth, Laurence M Hubby Jr: Optical display system including a light valve. Hewlett Packard Company, December 21, 1999: US06005722 (98 worldwide citation)

An optical display system includes a light source, a color wheel, an optical train and a light valve. The optical train includes a diffuser element, a compound parabolic concentrator and an integrator. The diffuser element diffuses incoming light to fill in holes in cone half-angle distribution of l ...


4
Mark M Butterworth: Light source assembly for scanning devices utilizing light emitting diodes. Hewlett Packard Company, October 31, 2000: US06139174 (84 worldwide citation)

A light source assembly and method of providing illumination a target surface utilize a fluorescent material to generate composite "white" light from source light of a particular color, i.e., a particular wavelength. The light source assembly is optimally designed for use in scanning devices, such a ...


5
Mark M Butterworth: Use of shutter to control the illumination period in a ferroelectric liquid crystal-based spatial light modulator display device. Hewlett Packard Company, October 3, 2000: US06128049 (50 worldwide citation)

A ferroelectric liquid crystal-based display device comprising a light source, a reflective spatial light modulator, a light output, a beam splitter, and a shutter. The beam splitter is located and aligned relative to the light source, the light output, and the spatial light modulator such that ligh ...


6
Mark M Butterworth: Multiple image autofocus. Aptina Imaging Corporation, Ratner Prestia, April 14, 2009: US07518651 (22 worldwide citation)

A camera provides an autofocus function by capturing a series of images when a lens is at different positions, analyzing the images to identify a best-focused image, and outputting the best-focused image. Unselected images can be discarded. The camera can include a FIFO buffer that receives image da ...


7
Mark M Butterworth: Liquid crystal light valve system with automatic color balance correction. Hewlett Packard Development Company, September 23, 2003: US06624756 (11 worldwide citation)

A liquid crystal-based light valve system with automatic color correction. The invention includes a light input, a liquid crystal-based spatial light modulator, a light output, a light intensity sensor, and a color controller. The light intensity sensor is located along an optical path between the l ...


8
Mark M Butterworth, Mike J Brosnan: Apparatus for capturing and analyzing light and method embodied therein. Avago Technologies ECBU IP, September 2, 2008: US07420542 (7 worldwide citation)

An apparatus including an image sensor is disclosed. The apparatus includes a polarization filter, an image sensor, and a processor connected to the image sensor. The polarization filter is adapted to filter out light polarized in a first direction from a first scene. The image sensor is adapted to ...


9
Vincent C Moyer, Mark M Butterworth, Michael J Brosnan, Roopinder Singh Grewal, Paul Michael Welch, Marshall T Depue, Tong Xie: Contaminant-resistant optical mouse and cradle. Avago Technologies ECBU IP, January 6, 2009: US07474297 (6 worldwide citation)

A contaminant-neutralizing cradle comprises a base and a support surface configured to removably receive a coherently-illuminated mouse. A neutralizing element is disposed on the support surface for alignment with at least one exposed surface of an optics module of the mouse and is configured to neu ...


10
Mark M Butterworth: Light source for tristimulus colorimetry. Hewlett Packard Company, July 27, 1999: US05929999 (6 worldwide citation)

A light source used to measure color involves associating a light emitter that emits light having a first spectral distribution with a wavelength-shifting medium that absorbs the emitted light and re-emits the light at a second spectral distribution that approximates one of the three color curves of ...



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