Patent ID: 6344643
Filing Date: 2002-02-05
Classification: G06F

Abstract:
An encoder wheel module and circuit board arrangement for an optical mouse with scrolling function, comprising:a circuit board having a microswitch known as a third button switch for special mouse operations; a mount mounted on said circuit board adjacent to said microswitch, said mount comprising a bottom frame, a suspension arm spaced above said bottom frame, a connecting portion connected between said bottom frame and said suspension arm at a rear side remote from said microswitch, and a narrow, forwardly extended gap defined between said bottom frame and said suspension arm in front of said connecting portion, said suspension arm having a front tongue suspending above said microswitch for triggering said microswitch; an optical encoder wheel supported on said suspension arm, said optical encoder wheel having a plurality of equiangularly spaced radial slots; a transmitter mounted on said mount at one side and connected to said circuit board and controlled by said circuit board to emit a light beam through the radial slots at said optical encoder wheel; and an optical detector mounted on said mount at one side opposite to said transmitter and connected to said circuit board and controlled by said circuit board to read the light beam transmitted by said transmitter; wherein said mount is made in integrity, such that when said optical encoder wheel is depressed, said microswitch is triggered by the front tongue of said suspension arm to accomplish third button activation so as to perform the predefined function.