Patent ID: 7800045

Claim:
An optical module for an optical mouse which moves over a working surface to detect a relative movement, comprising: a light source, including: a housing having a light-emitting surface; and a light emitting chip, disposed in said housing, for emitting light through said light-emitting surface of said housing; a light-guiding unit, including: a fixing portion forming a fixing space for fastening said light source; and a light-guiding portion for guiding said light emitted by said light source fastened in said fixing space; a first lens, disposed within said fixing space of said fixing portion; a second lens, disposed within said fixing space of said fixing portion at a position between said light source and said first lens; and a sliding unit, disposed on said second lens for adjusting a first relative distance between said first lens and said second lens and a second relative distance between said second lens and said light source; wherein said second lens substantially focuses said light emitted by said light source to a focal point of said first lens, and thereby said light after leaving said first lens being incident onto said working surface in a substantially collimated way.