US 2019/0196159 A1Published application

Anamorphic refractive objective lens assembly

AssigneeRaytheon Company

InventorsMarco A. Avila, Douglas J. Hartnett, Mark Noethen

Life of this patent

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Abstract

Aspects and embodiments are generally directed to compact anamorphic refractive objective lens assemblies. In one example, a refractive objective lens assembly includes a passively athermal anamorphic lens group including at least a first cylindrical lens having a surface optically powered in a first dimension, the first anamorphic lens group positioned to receive thermal infrared radiation, a focus cell positioned to receive the radiation from the anamorphic lens group, the focus cell including a first group of lenses each having a rotationally symmetric surface optically powered in the first dimension and a second dimension orthogonal to the first dimension, a relay lens group positioned receive the radiation from the focus cell, the relay lens group including a second group of lenses each having a rotationally symmetric surface optically powered in both the first and second dimensions, and a dewar assembly including a cold stop and an optical detector.

Claims7

Dependent claims

A refractive objective lens assembly comprising:

a passively athermal anamorphic lens group positioned to receive thermal infrared radiation and including a first cylindrical lens, a second cylindrical lens, and a third cylindrical lens each having a surface optically powered in a first dimension, the anamorphic lens group being configured to athermalize a first focal length of the refractive objective lens assembly in the first dimension;
a focus cell positioned to receive the thermal infrared radiation from the anamorphic lens group and including a first group of lenses each having a rotationally symmetric surface optically powered in at least a second dimension orthogonal to the first dimension, the first group of lenses being configured to adjust the first focal length and a temperature sensitive second focal length of the refractive objective lens assembly in the second dimension;
and
a relay lens group positioned to receive the thermal infrared radiation from the focus cell, the relay lens group including a second group of lenses each having a rotationally symmetric surface optically powered in at least the second dimension.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 16/290,435Filed 1 Mar 2019
Priority: 19 Jun 2017
Published: 27 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G02B 13/08
Optical objectives specially designed for the purposes specified below: anamorphotic objectives
G02B 7/028
For lenses: with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
G02B 13/0045
Having at least one aspherical surface: having five or more lenses
G02B 13/0095
Optical objectives specially designed for the purposes specified below: relay lenses or rod lenses

Family

Application15/626,965Division · filed 19 Jun 2017
Application16/290,435Division
US 10,281,694 B2Related patent
US 10,976,528 B2Related patent
US 2018/0364458 A1Published application
US 2019/0196159 A1This patent

From the US filing history. Foreign family members aren’t listed.