Method of optimization of measurement time for optical mouse sensor

摘要

A method for operating an optical sensing device having a light source and a photodetector device with at least one photosensitive element, said method comprising the steps of: (i) illuminating a surface portion with radiation by means of said light source; (ii) detecting radiation reflected from the illuminated surface portion with said at least one photosensitive element; (iii)while said surface portion is being illuminated, integrating an output signal of said at least one photosensitive element over time; (iv)comparing the output signal integration level with a first integration reference level during integration; (v) interrupting said integration step (iii) if said output signal integration level has reached said first integration reference level, or getting back to comparison step (iv) until a first integration period has elapsed if said output signal integration level has not reached said first integration reference level, and wherein said method further comprises the steps of: (vi) comparing said output signal integration level with a second integration reference level smaller than said first integration reference level, after said first integration period has elapsed; (vii) interrupting said integration step (iii), if said output signal integration level has reached at least said second integration reference level.