Methods of sampling a surface having a micro-texture

• US 6,713,752 B2
• Filed: 08/09/2002
• Issued: 03/30/2004
• Est. Priority Date: 10/28/1999
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Hastings, Brian L, Nay, Kevin W, Oliver, Thomas C
• Primary Examiner(s): Le, Que T.
• Assistant Examiner(s): SPEARS, ERIC J
• Application Number:
  US10/215,737
• Publication Number:
  US 20020185617A1
• Time in Patent Office: 599 Days
• Field of Search: 250/208.1, 250/221, 250/222.1, 345/166, 358/474, 358/475
• US Class Current: 250/221
• CPC Class Codes: H04N 1/047 Detection, control or error compensation of scanning velocity or position H04N1/0402 and H04N1/17 take precedence
• CPC Class Codes: H04N 1/107 with manual scanning
• CPC Class Codes: H04N 2201/04712 using unbroken arrays of detectors, i.e. detectors mounted on the same substrate
• CPC Class Codes: H04N 2201/04734 Detecting at frequent intervals, e.g. once per line for sub-scan control
• CPC Class Codes: H04N 2201/04737 by detecting the scanned medium directly, e.g. a leading edge

Abstract

Methods of sampling a surface having a micro-texture upon which an optical navigation circuit tracks movement. An embodiment of the method comprises determining a rate for taking samples of the surface, determining an exposure level of the surface, illuminating the surface at the determined rate for taking samples, and illuminating the surface for each of the samples with pulses of light at the determined exposure level.

Claims

1. A method of sampling a surface having a micro-texture upon which an optical navigation circuit tracks movement, the method comprising:

determining a rate for taking samples on the surface;

determining an exposure level on the surface;

illuminating the surface at the determined rate for taking samples; and

illuminating the surface for each of the samples with pulses of light at the determined exposure level.

2. The method of claim 1, wherein the pulses of light have an intensity selected to produce the determined exposure level.

3. The method of claim 1, wherein the pulses of light have a duration selected to produce the determined exposure level.

4. The method of claim 1, further comprising operating in the optical navigation circuit an electronic shutter for a duration that is selected to produce the determined level of exposure.

5. A method of sampling a surface having a micro-texture for tracking movement with an optical navigation circuit, the method comprising:

determining a sampling rate based upon the micro-texture of the surface;

determining an exposure level based upon the micro-texture of the surface; and

pulsing light onto the micro-texture of the surface at the determined exposure level and the determined sampling rate.

6. The method of claim 5, further comprising selecting an intensity for pulsing the light to produce the determined exposure level.

7. The method of claim 5, further comprising selecting a duration for pulsing the light to produce the determined exposure level.