Pixart Imaging Incorporated

Pixart Imaging Incorporation

Ming-Hui Kuo

Sheng-Yeh Lai

A computer input apparatus is disclosed which has improved safety control. Computer input devices with coherent light sources are popular. However, coherent light sources may cause serious and unrecoverable injuries to human eyes. Accordingly, there are several safety specifications defined by manufacturers and governments. Therefore, an improved device is disclosed that includes a calibration circuit and a fault detection circuit to control the operation current of a coherent light source to be within the safety specifications range, and to monitor for fault conditions. Furthermore, a computer input apparatus with coherent light source can be operated without the traditional optical lens.

Computer input apparatus having a fault detection circuit for detecting current flowing through a light source

Computer input apparatus having a calibration circuit and a fault detection circuit for regulating current to a light source

Computer input apparatus having a calibration circuit for regulating current to the light source

A computer input apparatus is disclosed which has improved safety control. The computer input apparatus includes a calibration circuit to control the operation current of a coherent light source to be above a minimum threshold required for normal operations, but below an upper threshold for safety reason. The computer input apparatus includes a fault detection circuit to monitor fault conditions. When this computer input apparatus employs a coherent light source, it does not require any optical lens to diminish optical power.

Growing community of inventors

Taipei, Taiwan

Ming-Hui Kuo