Achromatized and athermalized two-lens reimager
First Claim
Patent Images
1. A reimager comprising:
- precisely two positive lenses conjointly defining an optical axis and a depth of focus;
said two positive lenses further defining an intermediate image plane between said two positive lenses wherein an intermediate image of an object at infinity is generated by a first one of said two positive lenses and wherein said intermediate image is further imaged into an image plane by the second one of said two positive lenses; and
,said positive lenses being configured so that said reimager has a chromatic longitudinal aberration within said depth of focus and has a thermal image position variation which is smaller than said depth of focus for temperature variations within a range of at least +30°
about an intermediate temperature value.
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Abstract
A reimager comprises precisely two positive lenses wherein the chromatic longitudinal aberration lies within the depth of focus and the thermal image position variation likewise lies within the depth of focus over a temperature range of more than ±30° (in the embodiment from -40° C. to +70° C.). Aspheric and diffractive surfaces are utilized and, if required, are joined on respective lens surfaces (31, 51, 53, 71, 73).
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Citations
14 Claims
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1. A reimager comprising:
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precisely two positive lenses conjointly defining an optical axis and a depth of focus; said two positive lenses further defining an intermediate image plane between said two positive lenses wherein an intermediate image of an object at infinity is generated by a first one of said two positive lenses and wherein said intermediate image is further imaged into an image plane by the second one of said two positive lenses; and
,said positive lenses being configured so that said reimager has a chromatic longitudinal aberration within said depth of focus and has a thermal image position variation which is smaller than said depth of focus for temperature variations within a range of at least +30°
about an intermediate temperature value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification