Patent ID: 8957849
Filing Date: 2015-02-17
Classification: G01D,G06F

Abstract:
1. An optical scrolling module for a mouse, the mouse having a housing and a circuit board disposed in the housing, the optical scrolling module comprising: a light source disposed on the circuit board for providing a light beam; a light incident surface, a reflective surface and a contact surface, wherein the light incident surface is configured for the light beam to be incident on the light incident surface, and the contact surface is adapted for the light beam to pass through and be reflected by a finger; and an image sensor disposed on the circuit board, wherein all of the light beam is transmitted through the light incident surface and then reaches the reflective surface before reaching the contact surface and the finger, the light beam is scattered and reflected by the finger and then a portion of the light beam is transmitted to the image sensor, the light beam is reflected to the contact surface but the light beam is not emitted to the sensor when the finger is removed, the contact surface is a plane surface, and a depth of field of the first condenser is between 5 millimeters and 30 millimeters.