Patent ID: 8456452

Claim:
An optical pen mouse capable of magnifying a displayed object, comprising: a magnification setting unit a configured to receive an input magnification (M) to adjust a size of an object to be displayed on a monitor of a computer; and a microcomputer configured to calculate input coordinate values (X,Y) including a horizontal coordinate value and a vertical coordinate value based on an electrical signal from the light receiving unit and, when the magnification (M) is received from the magnification setting unit ( 130 ), to calculate display coordinate values (X′,Y′) based on the input coordinate values (X,Y) and the magnification (M), to convert the calculated display coordinate values (X′,Y′) into a coordinate data code and to output the coordinate data code; wherein the microcomputer comprises: a control unit configured to calculate current coordinate values (X,Y) based on an electrical signal from the light receiving unit, and to convert the current coordinate values (X,Y) and the display coordinate values (X′,Y′) into coordinate data codes; a magnification storage unit configured to store the magnification (M), received from the magnification setting unit under control of the control unit; and a display coordinate calculation unit configured to calculate the display coordinate values (X′,Y′) based on addition of remainders, obtained through division of the input coordinate values (Xn ,Yn) by the magnification (M), to subsequent input coordinate values (Xn+1,Yn+1) and division of values resulting from the addition by the magnification (M).