Optical imaging system having an electronically variable focal length and optical image sensor provided with such a system
First Claim
1. An optical imaging system having an electronically variable focal length, comprising a system of lenses and a liquid crystal layer, characterized in that the system of lenses is divided into a plurality of sectors having different, constant focal lengths and in that the liquid crystal layer forms part of an electronically variable diaphragm including at least first and second terminals disposed on the surface of said layer for selecting sectors of the system of lenses and hence selecting a focal length.
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Abstract
An imaging system having an electronically variable focal length is obtained by arranging, one after the other, a lens system (10) different sectors of which have different focal lengths and a liquid crystal diaphragm (20). By selecting sectors of the lens system with the aid of the diaphragm, an object (30) can be sharply imaged also at different object lengths in an image plane (40).
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Citations
7 Claims
- 1. An optical imaging system having an electronically variable focal length, comprising a system of lenses and a liquid crystal layer, characterized in that the system of lenses is divided into a plurality of sectors having different, constant focal lengths and in that the liquid crystal layer forms part of an electronically variable diaphragm including at least first and second terminals disposed on the surface of said layer for selecting sectors of the system of lenses and hence selecting a focal length.
Specification