1
Mark M Butterworth, Rene P Helbing: Fluorescent dye added to epoxy of light emitting diode lens. Hewlett Packard Company, December 8, 1998: US05847507 (178 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 (115 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 (87 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
Jeffrey N Miller, Mark M Butterworth, Rene P Helbing: Methods and systems for detecting selections on a touch screen display. Avago Technologies Fiber IP, December 8, 2009: US07629968 (8 worldwide citation)

Light beam focusing components direct light from the top surface of a touch screen display to one or more imagers. The imager or imagers capture one or more images of the top surface of the touch screen display. A processing unit analyzes the image or images to determine the position of an input dev ...


9
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 ...


10
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 ...