Patent ID: 8564570

Claim:
An optical touch apparatus, comprising: an input interface comprising at least one functional input key; at least one sensing module, disposed around the input interface, for receiving sensing lights and generating a sensing result according to the condition of receiving the sensing lights; and a processing module, coupled to the at least one sensing module, for determining a touch point position formed on the input interface according to the sensing result; wherein the position of the at least one functional input key disposed on the input interface corresponds to the position of the at least one sensing module disposed around the input interface, if N touch points are formed on the input interface at the same time, and M lines are formed between the N touch points and the at least one sensing module, the corresponding relationship between the position of the at least one functional input key disposed on the input interface and the position of the at least one sensing module disposed around the input interface makes N smaller than or equal to M, wherein M and N are positive integers and N is larger than or equal to 2, and the at least one functional input key is correspondingly disposed on suitable position of the input interface according to the position of the at least one sensing module disposed around the input interface to prevent the condition that N is larger than M.