A touch pad includes detection means for outputting a variable with respect to an operation surface, and control means for recognizing an operation finger candidate. In a case of one operation finger candidate, when a touch area exceeds a first threshold value, the control means determines the operation finger candidate to be an operation valid target finger. When a touch area does not exceed the first threshold value, the control means determines the operation finger candidate to be an operation invalid target finger. In a case of plural operation finger candidates, when a touch area exceeds a second threshold value indicating an area smaller than the first threshold value, the control means determines the operation finger candidate to be an operation valid target finger. When a touch area does not exceed the second threshold value, the control means determines the operation finger candidate to be an operation invalid target finger.
1. A touch pad comprising:
an operation surface;
a detection unit configured to detect proximity of a finger with respect to the operation surface and output a variable signal based on the detected proximity; and
a control unit configured to recognize at least one operation finger candidate and a number thereof on the basis of the variable signal,
wherein the control unit is further configured:
if the number of the at least one operation finger candidate is equal to or less than N where N is a natural number, determine the at least one operation finger candidate as a valid operation target when a touch intensity of the at least one operation finger candidate exceeds a first touch intensity, and determine the at least one operation finger candidate as an invalid operation target when the touch intensity of the at least one operation finger candidate does not exceed the first touch intensity; and
if the number of the at least one operation finger candidate is equal to or greater than N+1, determine the at least one operation finger candidate as a valid operation target when the touch intensity of the at least one operation finger candidate exceeds a second touch intensity smaller than the first touch intensity, and determine the at least one operation finger candidate as an invalid operation target when the touch intensity of the at least one operation finger candidate does not exceed the second intensity.
2. The touch pad according to claim 1 , wherein the touch intensity is an area of contact of the at least one operation finger candidate with the operation surface, the first touch intensity is a first threshold value of the area of contact, and the second touch intensity is a second threshold value of the area of contact, the second threshold value being smaller than the first threshold value.
3. The touch pad according to claim 1 , wherein N is one.
4. The touch pad according to claim 1 , wherein the control unit is further configured to allow an operation to be performed in accordance with position data of the at least one operation finger candidate if the at least one operation finger candidate is determined as the valid operation target.
5. The touch pad according to claim 1 , wherein the touch intensity is a duration of time for which a predetermined contact area of the at least one operation finger candidate with the operation surface is maintained.
6. The touch pad according to claim 1 , wherein the touch intensity is a pressure applied by the at least one operation finger candidate onto the operation surface.