Microsoft Technology Licensing, LLC

Jianping Xie

Jun Xu

Yuan Kong

Tianpeng Zhao

Hai Ming

Craig Steven Ranta

Deyong He

Huaqiao Gui

Liang Lv

Lei Guo

Wei Huang

Bo Yi

A computer input device includes a light source assembly forming an incident light beam that strikes an area on a surface beneath the input device with large incident angle. A light sensing assembly in the input device is positioned to receive scattered light and includes a band-pass filter. A barrier is located directly above the area where the light beam is incident on the top surface to prevent light from traveling directly from the light source assembly to the light sensing assembly.

Pointing device with optical positioning on low-diffusive surfaces

An input device encodes motion using a laser self-mixing velocimeter. The laser beam is directed at a disk or other moving member. As light from that beam is reflected back into the emitting cavity of the laser, the beam power output fluctuates because of the self-mixing effect and generates a beat signal. The beat signal frequency is used to determine the speed of the member's motion. The direction of motion is also determined based on the beat signal. A difference frequency analog phase locked loop filters the beat signal. A zero-point control disables motion detection when the average beat signal amplitude falls below a threshold. A triangle modulator generates a triangle wave for the laser bias current, with the triangle wave frequency being a submultiple of the beat signal frequency.

Input device using laser self-mixing velocimeter

Optical tracking systems, method, and devices are described in which optical components detect light within a substantially planar region adjacent to a user device. Tracking logic may receive signals output by the optical components and determine coordinates associated with a movement of a pointing object through the substantially planar region. The tracking logic may then provide for translation of the coordinates into an action on a display, such as, for example, a movement of a cursor or other icon on the display.

Method and system for optical tracking of a pointing object

A laser range finder includes a laser and a photosensitive element. The laser projects a beam onto a target surface. A backscattered portion of the laser beam returns to the laser from the target surface and enters the laser emitting cavity. Variations in laser output power are detected by the photosensitive element, which provides a 'beat' signal to a frequency detection circuit. The frequency detection circuit includes a difference frequency analog phase locked loop (DFAPLL) providing a purified form of the beat signal. The frequency of the purified beat signal is determined and used to calculate distance to the target surface.

Self-mixing laser range sensor

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Hefei, China

Jianping Xie