Irving R Abel from 22 Partridge Rd, Lexington, MA 02420, Phone: 781 274-0092

Autofocus System For Infrared Imaging Device
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US Patent:

45933227, Jun 3, 1986
Filed:

Jan 14, 1985
Appl. No.:

6/690909
Inventors:

Irving R. Abel - Lexington MA
Assignee:

Honeywell Inc. - Minneapolis MN
International Classification:

H01J 3149
US Classification:

358227
Abstract:

Apparatus for continuously determining the position of best focus of an objective lens and a system having a video output. The technique uses a transmissive plate of variable thickness located on one side of the field stop of the optical system associated with the video output. The plate covers the full vertical field of the system and covers on the order of 30 to 40 resolution elements in the horizontal direction. The plate is divided vertically into platelets of different thicknesses which are distributed in such a way as not only to cover the range of defocus of the system, but to discriminate against possible variations in scene content. The plate is placed outside the active area which will be displayed by the video; therefore the variations in thickness and in focus introduced by the plate are not displayed on the video, but are only used for the purpose of continuously determining the position of best focus. A spherical shell of zero power may be placed between the objective lens and the field stop in order to create a bias so that focal shifts introduced by the plate may be distributed about a nominal position, rather than all in a positive direction.

Symmetrical 1:1 Photographic Objective Lens
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US Patent:

43198090, Mar 16, 1982
Filed:

Apr 15, 1980
Appl. No.:

6/140529
Inventors:

Irving R. Abel - Lexington MA
Assignee:

The United States of America as represented by the Secretary of the Air
Force - Washington DC
International Classification:

G02B 962
US Classification:

350464
Abstract:

An objective lens system of the Double Gauss type wherein negative lens elements are symmetrically disposed on both sides adjacent the stop, each negative element being a cemented doublet comprising a double convex negative and a positive lens element. A cemented doublet positive lens component is next positioned at the outside of each of the negative elements and a single positive lens is positioned at the outside of each of the inner positive lens components.

Wide Field Reflective Optical Apparatus
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US Patent:

39633284, Jun 15, 1976
Filed:

Jan 17, 1974
Appl. No.:

5/434210
Inventors:

Irving R. Abel - Lexington MA
Assignee:

Honeywell Inc. - Minneapolis MN
International Classification:

G02B 1706
US Classification:

350294
Abstract:

The disclosure describes a wide field reflective optical system comprising an afocal fore telescope and an imaging system. The afocal telescope comprises first and second confocal paraboloidal reflectors, an aperture stop located in front of the first reflector at a distance equal to its focal length, and a field stop located at the common focal point of the reflectors. The imaging system is an improvement of the Schmidt principle and comprises an aspheric corrector reflector that reflects radiation from the second paraboloidal reflector onto a plane reflector. The plane reflector is located in front of a spherical reflector that focuses radiation at its focal plane through an aperture in the plane reflector.

Compact Optical System
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US Patent:

44114990, Oct 25, 1983
Filed:

Nov 7, 1980
Appl. No.:

6/204968
Inventors:

Irving R. Abel - Lexington MA
Marcus R. Hatch - Arlington MA
Assignee:

Honeywell Inc. - Minneapolis MN
International Classification:

G02B 1708
US Classification:

350442
Abstract:

An improved, compact optical system comprising a concave primary mirror and a convex secondary mirror. The primary mirror converges radiation to the secondary mirror. The secondary mirror comprises a lens having a first and a second surface. The second surface is coated with reflective material. The radiation received by the lens is refracted at the first surface, reflected back from the second surface, and then refracted once again by the first surface. The first and second surfaces have a shape for providing control of field curvature.

Optical System Having A Dual Field Of View
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US Patent:

43547427, Oct 19, 1982
Filed:

Nov 10, 1980
Appl. No.:

6/205365
Inventors:

Irving R. Abel - Lexington MA
Marcus R. Hatch - Arlington MA
Assignee:

Honeywell Inc. - Minneapolis MN
International Classification:

G02B 1708
US Classification:

350442
Abstract:

An optical system having a dual field of view. The system includes a wide-angle objective comprising a lens, a concave primary mirror, and a movable convex secondary mirror having a first position and a second position. When in the first position, the secondary mirror permits the wide-angle objective to focus radiation. When in the second position, the secondary mirror prevents radiation from being focused by the wide-angle objective. The combination of the secondary mirror when in the second position and the primary mirror comprise a narrow-angle objective with the primary mirror converging radiation to the secondary mirror and the secondary mirror focusing radiation. Thus, the optical system has a wide-angle field of view whenever the secondary mirror is in the first position and a narrow-angle field of view whenever the secondary mirror is in the second position.

Switch-While-Scan Optical System
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US Patent:

44866623, Dec 4, 1984
Filed:

Dec 27, 1982
Appl. No.:

6/453646
Inventors:

Irving R. Abel - Lexington MA
Assignee:

Honeywell Inc. - Minneapolis MN
International Classification:

H01J 3149
US Classification:

250334
Abstract:

An optical system produces sensor data from at least two fields of view (which may be centered differently) in a sequence selected to satisfy two simultaneous functions of the sensor.

Shade Reducing Aperture Stop For Thermal Imaging Systems
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US Patent:

41091493, Aug 22, 1978
Filed:

Jun 3, 1977
Appl. No.:

5/802996
Inventors:

Irving R. Abel - Lexington MA
Bruce R. Reynolds - Hudson MA
Assignee:

Honeywell Inc. - Minneapolis MN
International Classification:

G01J 100
G02B 2106
US Classification:

250347
Abstract:

An aperture stop is provided near the detector imaging lens of a thermal imaging system to prevent the infrared detector from viewing portions of the thermal imaging system itself, particularly the walls of the optical housing and the housing of the scanner within the optical housing. This eliminates "shading" problems which can occur in thermal imaging systems having a moving scanner within the optical housing.

Reflective Schmidt System With Nonrotationally Symmetric Corrector
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US Patent:

45764522, Mar 18, 1986
Filed:

Jun 2, 1983
Appl. No.:

6/500462
Inventors:

Irving R. Abel - Lexington MA
Marcus R. Hatch - Waltham MA
Assignee:

Honeywell Inc. - Minneapolis MN
International Classification:

G02B 510
US Classification:

350620
Abstract:

Wide field of view correction for wide spectral band imaging systems is achieved in reflective versions of the Schmidt and Schmidt-Cassegrain systems by the use of a fold mirror which also serves as a corrector plate. A method for fabricating the corrector plate is described.