Michael Lee Christensen
Engineers at Chimney Park Dr, Fort Collins, CO

6614563, Sep 2, 2003

Mar 30, 1999

09/281600

Patrick A Batten - Ft Collins CO
Michael L Christensen - Windsor CO
John G Thelen - Fort Collins CO

Hewlett-Packard Development Company, L.P. - Houston TX

H04N 104

358487, 358475, 358497

A transparency adaptor is described that includes a flat panel illuminator within the scanner lid of the scanner. The flat panel illuminator provides backlighting for scanning transparencies, such that light passes through the transparency only once and into the scanner optics within the scanner base. When the flat panel illuminator is lit during a scanning process, the light source within the scanner is not lit. In a second embodiment, the flat panel illuminator is removeably attached to the scanner lid. Another alternative is for the flat panel illuminator adapter to be a separate from the scanner, such that it is placed over a transparent document when needed, either plugging into the scanner or a separate power source during the scanning process.

6018161, Jan 25, 2000

Jul 31, 1998

9/127454

Patrick A. Batten - Fort Collins CO
Michael L. Christensen - Windsor CO
Martha A. Chavez - Greeley CO

Hewlett-Packard Company - Palo Alto CA

H01J 314

250234

An adapter for scanning transparent images using a reflective scanner. The adapter receives light from a lamp inside the scanner and redirects the light through the transparent image and back into the scanner. The scanner has an offset between an illumination line and a scan line. An angle of the adapter relative to the surface of a platen on the scanner is dependent on the distance between the illumination line and the scan line. At least one angle adjuster is provided on the adapter to enable the adapter to be used on scanners having different offsets. In addition, the adapter is made wider than the transparent image to be scanned, so that when the scan line is at a leading or trailing edge of the transparent image, the adapter still captures light from the lamp within the scanner.

5753908, May 19, 1998

Jan 9, 1997

8/780912

Michael L. Christensen - Windsor CO

Hewlett-Packard Company - Palo Alto CA

H01J 502

250239

An apparatus and method for achieving alignment of a photosensor array in an imaging device is disclosed. The photosensor array is mounted in an integrated circuit package having a plurality of downwardly extending leads. The leads are received in a plurality of sockets which are attached to and extend through the retina board. A pair of holes are provided extending through the retina board proximate the ends of the integrated circuit package. An actuator, such as a screw, is associated with each hole such that the actuator is able to contact the rear surface of the integrated circuit package. In this manner, one of the actuators may be used to apply a force to one end of the integrated circuit package in order to move that end away from the retina board and thus achieve alignment with the light beam. After the desired alignment has been achieved, some of the integrated circuit package leads may be soldered within their respective sockets in order to lock the integrated circuit package and photosensor array in place. Alternatively, some of the sockets may be omitted such that the corresponding integrated circuit package leads may be soldered directly to the retina board in order to lock the package in place.

6147343, Nov 14, 2000

Jul 23, 1998

9/121793

Michael L. Christensen - Windsor CO

Hewlett-Packard Company - Palo Alto CA

H01J 314

250234

Disclosed herein is a method and apparatus for compensating for temperature-induced scan line drift in a photoelectric imaging apparatus. A scan line drift compensation mechanism may be placed in contact with at least one of the optical components, e. g, a mirror, contained within the optical system of a photoelectric imaging apparatus. The scan line drift compensation mechanism may be formed from two members, each having a different coefficient of thermal expansion. In this manner, the scan line drift compensation mechanism is able to exert a force on the optical component in response to a change in temperature.

6316767, Nov 13, 2001

Sep 17, 1999

9/398264

Dan C Paxton - Loveland CO
Michael L Christensen - Windsor CO
Eugene W Pakenham - Ft Collins CO

Hewlett-Packard Company - Palo Alto CA

H01J 314, H01J 516, H01J 4014, H04N 104

250234

An apparatus for connecting electrical power to an exposure lamp in an image scanner in response to the detection of ambient light by a light sensor located under the scanner's cover. Such an apparatus provides an apparent reduction in exposure lamp warm-up time, with associated improvement in operator productivity, while minimizing exposure lamp operational life degradation and excessive energy consumption caused by leaving the exposure lamp turned on. Once the exposure lamp is turned on, a timing circuit is used in the preferred embodiment to disconnect electrical power from the exposure lamp so that if the scanner's cover is left open or closed, the exposure lamp will not be left on for excessively long periods of time.

6166829, Dec 26, 2000

Apr 28, 1998

9/067785

Michael L. Christensen - Windsor CO
Stephen J. Cook - Loveland CO

Hewlett-Packard Company - Palo Alto CA

H04N 1024

358473

An optical image scanner includes a scan head that is mounted onto a guide member with a bias torque that reduces uncertainty in position of the scan head. A drive member, such as a belt or cable, is attached to the scan head with an offset relative to a centerline of the guide member. A tensioning device ensures that the drive member asserts force on the scan head at each of the attachment points. As a result, a bias torque is placed onto the scan head, relative to the guide member, reducing uncertainty in position. For bidirectional movement, the biasing torque is the same for either direction of travel.

5895913, Apr 20, 1999

Jan 9, 1997

8/781781

Michael L. Christensen - Windsor CO

Hewlett-Packard Company - Palo Alto CA

H01J 314, H01L 2700

250235

Apparatus for sensing an initial position of a moveable carriage mounted within a housing of an imaging device may comprise a detector having a plurality of light sensitive elements for detecting objects within a field of view. At least one of the light sensitive elements is an image sensing element and at least one of the light sensitive elements is a position sensing element. A reference mark is positioned on the housing so that is within the field of view of the position sensing element of the detector when the carriage is at about a home position. An image data processor connected to the detector and responsive to the output signals generated thereby determines whether the reference mark is within the field of view of the position sensing element of the detector.