| 摘要 |
PROBLEM TO BE SOLVED: To enhance sensitivity of a CCD by enhancing the condensation efficiency through a microlens. SOLUTION: A microlens 21 has a multilayer structure of an upper layer part 19a and a lower layer part 18a having a refractive index lower than that of the upper layer part 19a. Since the microlens 21 has a refractive index different in the central part 21a and in the peripheral part 21b, a peripheral light 22b impinging on the peripheral part 21b is condensed at a photodiode 13 just like a central light 22a impinging on the central part 21a.
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