Patent ID: 8334500
Filing Date: 2012-12-18
Classification: G02B,G06K

Abstract:
1. An image pickup apparatus, comprising: an optical system comprising one or more glass lenses and one or more plastic lenses, wherein a power of each of the plastic lenses is lower than a power of all of the glass lenses and a power of the optical system; an image pickup device operable to pick up an object image that has passed through the optical system as an out-of-focus dispersed object image comprising an area with a large-depth-of-field light and a blurred area; an image processing device operable to generate an image signal with a smaller blur than that of a signal of the out-of-focus dispersed object image; wherein the optical system comprises an optical wavefront modulation element that modulates an optical transfer function, and a phase of the optical wavefront modulation element satisfies the following relation: where m and n are integers, j is an index variable and |x|≦1, and |y|≦1, z is a depth from an optical axis of the optical system, x and y are directions along two axes perpendicular to the optical axis and to each other, and C is an aspheric surface coefficient.