Multifocal objective
First Claim
1. A lens system having an image-forming objective which is capable of forming sharp images of objects at at least two different distances from said objective, a corrective element (3) divided into at least two fields of differing refractive power being arranged at one focal plane (F) of the objective, said corrective element (3) being arranged in the objective focal plane (F) which is located closest to a said object, and an entrance pupil of said objective being located at its forward focus in the direction of said object.
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Accused Products
Abstract
The present invention relates to an image-forming objective which is capable of forming sharp images of objects at at least two different distances from the objective, there being arranged at one focal plane of the objective a corrective element divided into at least two fields in which the refractive power differs between them.
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Citations
8 Claims
- 1. A lens system having an image-forming objective which is capable of forming sharp images of objects at at least two different distances from said objective, a corrective element (3) divided into at least two fields of differing refractive power being arranged at one focal plane (F) of the objective, said corrective element (3) being arranged in the objective focal plane (F) which is located closest to a said object, and an entrance pupil of said objective being located at its forward focus in the direction of said object.
Specification