Micro non-imaging light concentrators for image sensors with a lenslet array

• US 5,352,886 A
• Filed: 03/30/1993
• Issued: 10/04/1994
• Est. Priority Date: 03/30/1993
• Status: Expired due to Fees

• Current Assignee: The United States of America As Represented By The Secretary of Agriculture
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Kane, Jonathan S.
• Primary Examiner(s): Nelms, David C.
• Assistant Examiner(s): LE, QUE TAN
• Application Number:
  US08/039,656
• Time in Patent Office: 553 Days
• Field of Search: 250/216, 250/208.1, 250/208.2, 250/208.6, 359/626, 359/869, 359/853, 359/709, 359/712, 359/708, 356/121
• US Class Current: 250/216
• CPC Class Codes: G01J 1/04 Optical or mechanical part supplementary adjustable parts
• CPC Class Codes: G01J 1/0422 using light concentrators, collectors or condensers
• CPC Class Codes: G02B 3/0025 Machining, e.g. grinding, polishing, diamond turning, manufacturing of mould parts
• CPC Class Codes: G02B 3/0056 arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085

Abstract

An array of micro-sized converging light transmissive channels is positioned between a lenslet array and an array of pixel detectors. The result is that the detectors are substantially smaller than upper portions of the channels and non-optical components may be positioned between the detectors. The side walls of the channels are reflective and have a hyperbolic or parabolic shape to maximize the acceptance angle of rays entering the device for maximum efficiency. A method of producing the channels employing a micro-sized machine bit is also disclosed.

Claims

1. A light ray concentrating light image sensor device comprising:

(a) an array of light image detectors for detecting picture elements of a light image viewed by said image sensor device;

(b) an array of converging light transmissive channels having light reflective portions therein and upper portions and lower portions smaller than the upper portions, the lower portions thereof being aligned with the light image detectors; and

(c) a lenslet array, the lenslets thereof being aligned with said converging light transmissive channels.

2. The device of claim 1 wherein said light image detectors are substantially smaller than the upper portions of the converging light transmissive channels thereby enabling non-optical components to be positioned between said light image detectors if desired.

3. The device of claim 2 wherein said upper portions have diameters of 100-200 microns and said lower portions have diameters of 2-50 microns.

4. The device of claim 1 wherein said light reflective portions have parabolic or hyperbolic shapes, thereby to maximize the acceptance angle of light rays entering the converging light transmissive channels to in turn maximize the efficiency of the device.

5. The device of claim 2 wherein said light reflective portions have parabolic or hyperbolic shapes, thereby to maximize the acceptance angle of light rays entering the converging light transmissive channels to in turn maximize the efficiency of the device.

6. The device of claim 3 wherein said light reflective portions have parabolic or hyperbolic shapes, thereby to maximize the acceptance angle of light rays entering the converging light transmissive channels to in turn maximize the efficiency of the device.