Pixart Imaging Incorporated

Pixart Imaging Incorporation

Chip Goal Electronics Corporation

Sheng-Yeh Lai

Ming-Hui Kuo

Jeng-Feng Lan

Chien-Teng Huang

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.

Computer input apparatus

The present invention discloses a photo driver circuit with power saving function and a corresponding method thereof. The photo driver circuit with power saving function comprises: a photo sensor device for sensing light and generating a corresponding photo current; a current amplifier amplifying the photo current; an output control circuit for generating a driver output signal according to the output of the current amplifier; and a power saving control circuit for activating a power saving mode in which the power saving control circuit outputs one or more control signals to shut down one or both of the current amplifier and the output control circuit.

Photo driver circuit with power saving function and method thereof

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Hsinchu, Taiwan

Sheng-Yeh Lai