Achromatic and athermalized reimager
First Claim
Patent Images
1. An achrathermalized reimager comprising:
- a front objective defining an optical axis;
a relay optic arranged on said optical axis downstream of said front objective;
said front objective being both achromatic and athermalized including precisely one negative lens made of a material selected from the group consisting of ZnSe and ZnS and one positive lens made of chalcogenide glass.
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Abstract
An achrathermalized reimager includes a front objective defining an optical axis and a relay optic arranged on the optical axis downstream of the front objective. The front objective is both achromatic and athermalized and includes precisely one negative lens made of a material selected from the group consisting of ZnSe and ZnS and one positive lens made of chalcogenide glass.
31 Citations
23 Claims
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1. An achrathermalized reimager comprising:
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a front objective defining an optical axis; a relay optic arranged on said optical axis downstream of said front objective; said front objective being both achromatic and athermalized including precisely one negative lens made of a material selected from the group consisting of ZnSe and ZnS and one positive lens made of chalcogenide glass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An achrathermalized reimager comprising:
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precisely four lenses; first and second ones of said four lenses defining a front objective and third and fourth ones of said four lenses defining a relay optic; said first and said third lenses each being a positive lens and said second and said fourth lenses each being a negative lens; and
,said second and fourth lenses each being made of ZnSe or ZnS.
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22. A reimager having an intermediate image comprising:
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four or five lenses configured such that the reimager is achromatic over more than 80% of the depth of field for a wavelength range including 8 to 10 μ
m; and
,said lenses being configured to be athermal over a temperature range of at least ±
30°
C. referred to the normal temperature 20°
C. and over more than 60% of the depth of field.
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23. A reimager having an intermediate image comprising:
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four or five lenses configured such that the reimager is achromatic over more than 65% of the depth of field for a wavelength range including 7.5 to 10.5 μ
m; and
,said lenses being configured to be athermal over a temperature range of at least -40°
C. to +70°
C. and over more than 60% of the depth of field.
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Specification