Patent ID: 8030726
Filing Date: 2011-10-04
Classification: H01L

Abstract:
1. A solid-state image sensor comprising: a semiconductor substrate having: (a) a front surface; (b) a rear surface; and (b) a first hardness; an edge detection portion formed in the semiconductor substrate in a thickness direction from the front surface, the edge detection portion having a length in a depth direction, the edge detection portion having a second hardness, the second hardness being larger than the first hardness, the semiconductor substrate having a portion removed by chemical mechanical polishing until a position where the edge detection portion is exposed; a photo conversion element provided in the semiconductor substrate, the photo conversion element configured to absorb light to perform photoelectric conversion, the photo conversion element having a thickness corresponding to the length in the depth direction of the edge detection portion; and means for acquiring incident light from the rear surface by reading out a signal from the photoelectric conversion element, the means being formed on the front surface.