Alexander L Chapman

US Patent:

6624407, Sep 23, 2003

Filed:

Jul 3, 2001

Appl. No.:

09/898375

Inventors:

Dariush Aboonasry - Lexington KY
Christopher Alan Adkins - Lexington KY
Alexander Lloyd Chapman - Lexington KY
Darell Dean Cronch - Georgetown KY
David Michael Cseledy - Lexington KY
Barry Baxter Stout - Lexington KY

Assignee:

Lexmark International, Inc. - Lexington KY

International Classification:

G01D 534

US Classification:

25023114, 341 13, 356616, 356617

Abstract:

An encoder including a light source for emitting light, a photodetector for detecting at least part of the light emitted by the light source, and an encoder film including a plurality of alternating bars and windows and being located between the light source and the photodetector. The encoder includes a mask including a plurality of alternating bars and windows, the mask being located between the light source and the photodetector. The encoder further includes a spacer located between the mask and the encoder film, the encoder film contacting the spacer to maintain a predetermined spacing between the mask and the encoder film.

US Patent:

7126107, Oct 24, 2006

Filed:

Mar 14, 2003

Appl. No.:

10/389644

Inventors:

Adam J. Ahne - Lexington KY, US
Alexander L. Chapman - Lexington KY, US
Patrick L. Kroger - Lexington KY, US
Jay W. Vessels - Lexington KY, US

Assignee:

Lexmark International, Inc. - Lexington KY

International Classification:

G01D 5/34
G01J 9/00

US Classification:

25023113, 25023117, 341 13, 341141

Abstract:

An encoder and related methods for use in a printing device indexing system are provided. In some embodiments, the system comprises a feedroller or other component configured to index media through a printing device, and an encoder disk is coupled to the feedroller. In these embodiments, the system includes a reflective optical detector having a transmitter and a receiver provided adjacent a first surface of the encoder disk, the reflective optical detector being configured to detect the passage of the home position mark as the encoder disk rotates by the reflection of radiation off of the first surface. Also provided in some embodiments are methods for setting a counter to correspond with the home position of a rotatable element by utilizing threshold signal levels.

US Patent:

7391525, Jun 24, 2008

Filed:

Mar 14, 2003

Appl. No.:

10/389576

Inventors:

Alexander L. Chapman - Lexington KY, US
David G. King - Shelbyville KY, US
Patrick L. Kroger - Versailles KY, US
Randall D. Mayo - Georgetown KY, US
Barry B. Stout - Lexington KY, US

Assignee:

Lexmark International, Inc. - Lexington KY

International Classification:

B41J 11/46
B41J 11/55
B41J 11/42
B41J 11/36
B41J 11/00

US Classification:

358 112, 358504, 358406, 399361, 399371, 399395

Abstract:

Methods and systems for calibrating media indexing errors in a printing device are provided. In one embodiment, the method comprises feeding a calibration media through a printing device, sensing the position of the media as it moves through the printing device, sensing positions of a media indexing component as the media moves through the printing device, determining media indexing position errors based upon the sensed positions, and calculating a compensation factor to be applied based upon the errors. In some embodiments, parameters of a line and/or other function are determined from the error data and the parameters are utilized to calculate a compensation factor. Moreover, in some embodiments, it is determined what range the data fits within, and a predetermined compensation factor is determined based upon the range.

US Patent:

20030052261, Mar 20, 2003

Filed:

Sep 19, 2001

Appl. No.:

09/956480

Inventors:

Alexander Chapman - Lexington KY, US
Adam Ahne - Lexington KY, US
Michael Marra - Lexington KY, US
Christopher Adkins - Lexington KY, US
Barry Stout - Lexington KY, US
Patrick Kroger - Versailles KY, US
David Cseledy - Lexington KY, US

International Classification:

G01D005/34

US Classification:

250/231130

Abstract:

An optical encoder assembly for an optical encoder for determining rotation of a rotatable shaft. An encoder housing is non-engageable with the shaft. A receiver plate is attached to the encoder housing, has a first side and a substantially opposing second side, and has a through hole and a window both extending from the first side to the second side, wherein the through hole is engageable with the shaft. An encoder mask is attached to the first side of the receiver plate, has a shaft hole engageable with the shaft, and has a mask grating positioned over the window. A light emitter is aligned to face the first side of the receiver plate and is positioned over the mask grating. A light detector is attached to the second side of the receiver plate and is positioned over the window.

US Patent:

20210266159, Aug 26, 2021

Filed:

Feb 24, 2021

Appl. No.:

17/184173

Inventors:

- Lexington KY, US
ALEXANDER LLOYD CHAPMAN - LEXINGTON KY, US
KEITH BRYAN HARDIN - LEXINGTON KY, US

International Classification:

H04L 9/08
H04L 9/32

Abstract:

The present invention is a diverse acoustical object containing a range of particles that have acoustical wave impedances that are substantially different from the binder. The particles create a substantially different reflection as an acoustic wave is scattered by the particles. A negative reflection is created when the scattered wave is from a particle that has a wave impedance that is substantially less than the binder impedance. Practically, it may be necessary to encase this material in a thin material that will withstand the fabrication process (e.g., air or silicone elastomer could be encased in glass). If the wavelength is large compared to the encasing material thickness, then the reflection will be more dependent on the interior material. A mixture of materials that generate positive as well as negative reflections within the binder would add to the complexity of the PUF.

Author:

Alexander Chapman

ISBN #:

0030591899

Author:

Alexander Chapman

ISBN #:

0801023890