| US 7,567,341 B2 | ||
| Optical navigation device adapted for navigation on a transparent structure | ||
| David W. Dolfi, Los Altos, Calif. (US); Ramakrishna Kakarala, Santa Clara, Calif. (US); and Annette Claire Grot, Santa Clara, Calif. (US) | ||
| Assigned to Avago Technologies ECBU IP (Singapore) Pte. ltd., Singapore (Singapore) | ||
| Filed on Sep. 28, 2007, as Appl. No. 11/864,301. | ||
| Application 11/864301 is a continuation in part of application No. 11/734244, filed on Apr. 11, 2007. | ||
| Application 11/734244 is a continuation in part of application No. 11/618427, filed on Dec. 29, 2006. | ||
| Prior Publication US 2008/0158540 A1, Jul. 03, 2008 | ||
| Int. Cl. G01P 3/36 (2006.01) | ||
| U.S. Cl. 356—28 [701/223] | 21 Claims |
| 1. A method for adapting an optical navigation device for navigation on a transparent structure where the transparent structure
overlays an opaque surface, the method comprising:
establishing a navigation window for navigation tracking;
detecting reflected light within the navigation window;
generating an output signal in response to the detected light; and
adjusting a characteristic of the navigation window in response to the output signal, wherein adjusting a characteristic of
the navigation window comprises:
adjusting a characteristic of the navigation window to primarily detect light that is reflected from the opaque surface when
the amount of detected light that is reflected from the opaque surface is greater than the amount of detected light that is
reflected from a top surface of the transparent structure; and
adjusting a characteristic of the navigation window to primarily detect light that is reflected from the top surface of the
transparent structure when the amount of detected light that is reflected from the top surface of the transparent structure
is greater than the amount of detected light that is reflected from the opaque surface.
|