Patent ID: 9571728
Date: 2017-02-14
CPC Classifications: H01L,H04N

Claim:
1. An image acquisition apparatus comprising: an image-acquisition optical system that includes at least one lens and that collects light from a subject; an image acquisition element that includes an image sensor and that acquires an image of the light collected by the image-acquisition optical system; a micro-lens array having an array of multiple micro-lenses arranged such that each micro-lens covers multiple pixels of the image acquisition element; and a focal-length changing section that includes a plurality of lenses, that is disposed at a pupil position of the image-acquisition optical system, that divides the pupil position into a plurality of areas, and that changes, for each of the plurality of areas, a focal length so as to focus light passing therethrough at a plurality of different focal positions, wherein the image-acquisition optical system includes a plurality of lenses that are disposed along an optical axis of the image-acquisition optical system, wherein the plurality of areas are arranged in a direction perpendicular to the optical axis of the image-acquisition optical system and have powers different from each other, and wherein one of the plurality of lenses of the image-acquisition optical system disposed at a subject side and another one of the plurality of lenses of the image acquisition optical system disposed at an image side are in common with respect to the light passing through the plurality of areas.