Importance

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Abstract

An encoder wheel module and circuit board arrangement for an optical mouse with scrolling function, which includes a circuit board having a microswitch, a mount mounted on the circuit board, the mount having an integrally-formed bottom frame, an integrally-formed suspension arm spaced above the bottom frame, and an integrally-formed connecting portion connected between the bottom frame and the suspension arm at a rear side, the suspension arm having a front tongue suspending above the microswitch, an optical encoder wheel supported on the suspension arm, a transmitter mounted on the mount at one side and controlled by the circuit board to emit a light beam through radial slots at the optical encoder wheel, and an optical detector mounted on the mount at one side opposite to the transmitter and controlled by the circuit board to read the light beam transmitted by the transmitter, wherein the optical encoder wheel not only provides scrolling up and scrolling down functions when rotating the encoder wheel, but also provides third button functions when depressing the encoder wheel. Depressing the encoder wheel consequently forces the suspension arm and its front tongue down to activate the third button switch to perform special mouse operations.

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First Claim