MULTIPLE MAGNIFICATION OPTICAL SYSTEM WITH SINGLE OBJECTIVE LENS
First Claim
1. A multiple magnification optical system for viewing a specimen, comprising:
- a single objective lens;
the objective lens having a focal length equal to F0;
the objective lens having a principal plane;
a gradient-index lens;
the gradient-index lens positioned to receive light passing throughthe objective lens;
a beam splitter;
the beam splitter creating first and second optical axes;
the beam splitter positioned to receive light passing through the gradient-index lens;
a first camera aligned in the first optical axis;
a first lens in the first optical axis;
the first lens having a focal length equal to F1;
the first lens situated a distance F1 from the first camera;
a second camera aligned in the second optical axis;
the second camera situated a distance from the principal plane of the objective lens equal to 2F0;
so that a first magnification of the specimen at the first camera is obtained where the working distance of the objective lens from a specimen is equal to F0, and a second magnification of the specimen at the second camera is obtained where the working distance of the objective lens from the specimen is equal to 2F0.
2 Assignments
0 Petitions
Accused Products
Abstract
A multiple magnification optical system (220) for viewing a specimen has a single objective lens (100) focused upon a specimen (115) at a given working distance (180). A graded-index lens (120) is positioned to receive light passing through the objective lens (100) from the specimen (115) and preserve the phase of the light entering from the objective (100). A beam splitter (130) splits the light exiting the gradient-index lens (120) into a first optical axis (200) and a second optical axis (210). The objective lens (100) is located within the chamber of a vacuum instrument, and the beam splitter (130) and parts following in the optical train are located outside the vacuum chamber. A first lens (130) is aligned in the first optical axis (200) between the beam splitter (130) and a first camera (150) to focus a magnified image at the first camera (150). A second camera (170) is situated along the second optical axis (210) a distance from the rear principal plane (110) of the objective lens (100) so as to obtain unity magnification when the working distance (180) of the objective lens (100) is set at twice its focal length. Multiple magnifications can be obtained with a single objective lens (100) by moving the optical system (220) axially to set different working distances to a specimen, and by using multiple beam splitters (130), or combinations thereof.
28 Citations
8 Claims
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1. A multiple magnification optical system for viewing a specimen, comprising:
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a single objective lens; the objective lens having a focal length equal to F0; the objective lens having a principal plane; a gradient-index lens; the gradient-index lens positioned to receive light passing through the objective lens; a beam splitter; the beam splitter creating first and second optical axes; the beam splitter positioned to receive light passing through the gradient-index lens; a first camera aligned in the first optical axis; a first lens in the first optical axis; the first lens having a focal length equal to F1; the first lens situated a distance F1 from the first camera; a second camera aligned in the second optical axis; the second camera situated a distance from the principal plane of the objective lens equal to 2F0; so that a first magnification of the specimen at the first camera is obtained where the working distance of the objective lens from a specimen is equal to F0, and a second magnification of the specimen at the second camera is obtained where the working distance of the objective lens from the specimen is equal to 2F0. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification