Barclay J Tullis

US Patent:

6362573, Mar 26, 2002

Filed:

Mar 30, 2000

Appl. No.:

09/539489

Inventors:

Rene Helbing - Palo Alto CA
Barclay J. Tullis - Palo Alto CA
Ken A. Nishimura - Fremont CA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

H05B 3702

US Classification:

315155, 315149, 315308

Abstract:

An apparatus and method are described for monitoring the life of an arc lamp bulb. The apparatus includes a memory that stores a threshold property value. An arc lamp bulb property sensor acquires a current arc lamp bulb property value. A control circuit compares the current arc lamp bulb property value with the threshold property value. The control circuit generates an end-of-life notification signal when the current arc lamp bulb property value meets the threshold property value.

US Patent:

6472887, Oct 29, 2002

Filed:

Jun 28, 2000

Appl. No.:

09/606417

Inventors:

Barclay J. Tullis - Palo Alto CA
Carl Picciotto - Menlo Park CA
Jun Gao - Mountain View CA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G01R 2726

US Classification:

324663, 324662, 324671, 73304 C

Abstract:

One embodiment of the invention is a capacitive sensor for sensing the amount of material in a container. This embodiment includes an oscillator that generates an oscillating signal. This oscillator includes an integrating amplifier that is formed by (1) an operational amplifier that has a low-impedance output and a virtually-grounded input, and (2) a capacitor that has a capacitance which depends on the amount of material in the container. The capacitor connects between the low impedance output and the virtually-grounded input of the operational amplifier In some embodiments, the operational amplifier includes a first amplifier and a second amplifier that are connected in series, with an output of the second amplifier fed back through the capacitor to the input of the first amplifier.

US Patent:

6516131, Feb 4, 2003

Filed:

Apr 4, 2001

Appl. No.:

09/825821

Inventors:

Barclay J. Tullis - Palo Alto CA 94303

International Classification:

G02B 600

US Classification:

385137, 385 65

Abstract:

Presented are structures and methods by which to align fiber optics side-by-side or end-to-end; to align fiber optics to features in supporting substrates or to objects on supporting substrates; and to align substrates to one another. Alignment grooves are included with particular properties that permit the groove to participate in the moving of a fiber into alignment. A fiber is used in a tapered channel as an alignment key enabling accurate tuning of an optical coupling ratio and efficiency of fiber-optic side-polished couplers, multiplexers, taps, splitters, joiners, filters, modulators and switches. Substrates made of crystal are presented having variable-width grooves and in some cases also variable-depth grooves which form guiding and constraining pathways for fiber optics. The reader will readily appreciate the novel structures and methods applicable to realize manufacturable fiber optics to perform all-fiber photonic functions.

US Patent:

6517180, Feb 11, 2003

Filed:

Mar 27, 2001

Appl. No.:

09/819102

Inventors:

Barclay J Tullis - Palo Alto CA
Ross R. Allen - Belmont CA
Jun Gao - Mountain View CA
Carl E Picciotto - Menlo Park CA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

B41J 201

US Classification:

347 19

Abstract:

A print monitoring approach is provided in which sequences of irregular two-dimensional frames of image information are captured at a resolution sufficiently high to enable details of individual droplets to be identified. The approach may be used to monitor individual droplets deposited on a medium, such as a sheet of paper, by an inkjet printhead. An optical detector having an irregular two-dimensional array of closely spaced sensor elements is mounted for movement with the inkjet printhead or other print assembly. A processor is responsive to the image frames from the optical detector to adjust print quality parameters when the physical characteristics of the imaged droplets are detected as being outside of a preselected range of acceptability. The physical characteristics that are resolved may include gyrational information or different droplet position information. Optical dot gain can also be measured.

US Patent:

6535243, Mar 18, 2003

Filed:

Jan 6, 1998

Appl. No.:

09/003265

Inventors:

Barclay J. Tullis - Palo Alto CA

Assignee:

Hewlett- Packard Company

International Classification:

H04N 5225

US Classification:

3482071, 34833311, 3482112, 348 1402

Abstract:

A method and system allow a hand-held digital camera to access and store large volumes of digital image data utilizing a wireless communications link between a host computer and the camera. In an embodiment of the invention, imaging optics and a photosensor array capture image data that represents an image of a subject. A transceiver integrated into the hand-held digital camera then transmits the image data to a host computer via a wireless communications link. The host computer stores the image data, or a copy of the image data, and retransmits related image data or, alternatively, the same image data back to the hand-held digital camera via the wireless communications link. Once the image data is received by the hand-held digital camera, an electronic image is formed by a display device that is integrated into the camera. The host computer may process the digital image data into enhanced digital image, thereby enabling the camera to display an enhanced electronic image of a subject. The communications link between the hand-held digital camera and the host computer can transfer data at a sufficiently high bandwidth to provide virtually real-time feedback to a computer operator.

US Patent:

6535685, Mar 18, 2003

Filed:

Jul 19, 2001

Appl. No.:

09/909957

Inventors:

Barclay J. Tullis - Palo Alto CA 94303

International Classification:

G02B 636

US Classification:

385137, 385134, 385 30

Abstract:

Structures and methods using crystalline substrates enable precise and accurate manufacture of side-polished fiber optics. A groove constrains a fiber and includes multiple lengthwise portions with constant widths and depths. Where the depth(s) are small enough, the fiber can be side-polished to create a side-polished region. To either end of a side-polished region, groove depths are made large enough to protect the fiber from side-polishing. The curvature(s) of the fiber away from the side-polished region into deeper portions of the groove are controlled by at least the lengths and depths of the multiple lengthwise portions of the groove. A variety of 2, 3, and 4-port fiber optic apparatuses can be constructed using the disclosed structures.

US Patent:

6552698, Apr 22, 2003

Filed:

May 2, 2000

Appl. No.:

09/563182

Inventors:

Richard C. Walker - Palo Alto CA
Pierre H. Mertz - Mountain View CA
Barclay J. Tullis - Palo Alto CA

Assignee:

Agilent Technologies, Inc. - Palo Alto CA
Hewlett-Packard Company - Palo Alto CA

International Classification:

G09G 500

US Classification:

345 7, 345 8

Abstract:

An immersive display system which provides for an optical correlator for imaging a surface and generating data representative of the position or movement of the optical correlator and any object physically associated with the optical correlator. Imagery is generated and displayed on a display device in accordance with the data generated by the optical correlator.

US Patent:

6563101, May 13, 2003

Filed:

Jan 19, 2000

Appl. No.:

09/487100

Inventors:

Barclay J. Tullis - Palo Alto CA 94303

International Classification:

H01L 2700

US Classification:

2502081, 348275

Abstract:

Described is an image tracking device that includes an array of light-sensitive elements. A row and a plurality of columns define the array, and an intersection of the row with one of the columns defines a cell frame. The row and columns are arranged in non-rectilinear geometry. Each cell frame has a frame area, and one of the light-sensitive elements is disposed in each cell frame. Each light sensitive element has an active area that generates an electrical signal indicative of light from a portion of an image that is incident within the cell frame containing that element. A fill-factor is defined by the ratio of the active area in a cell frame to the frame area of that cell frame. Two-dimensional motion of an image that is incident on the array can be tracked by whole-frame correlations between successive images from the array thereby eliminating the need for localized correlations throughout the array and subsequent curvilinear transformation algorithms to convert motion data throughout the image from an otherwise rectilinear array into data that is representative of the actual two-dimensional motion of the object. Geometric distortions produced by an optical system that focuses an image on the array or by curved object surfaces can be corrected or compensated for by arranging the array in a non-rectilinear shape that matches the geometric distortion in the image. For example, the array can have a pincushion shape or a barrel shape to compensate for pincushion distortion or barrel distortion respectively.