Illuminating optical system for cutting infrared light by relief

Details Illuminating optical system for cutting infrared light by relief Illuminating optical system for cutting infrared light by relief

1998-02-03

2000-08-08

O'Shea, Sandra

Illumination

Light source and modifier

Including selected wavelength modifier

362257, 362311, 362317, 362326, 359558, 359566, 359569, F21V 904

Patent

active

060991461

ABSTRACT:
An illumination optical system for cutting infrared light by a relief type optical element includes a light source and a relief type diffraction optical element having a rectangular sectional-shaped grating having an equal area of land and groove areas so that primarily zero order light can be used for illumination while higher order and infrared light may be filtered out. A relief pattern has characteristics such that a ratio .beta. of a width of a plurality of respective concave portions to a pitch of adjacent convex portions is in a range of 0.34.ltoreq..beta..ltoreq.0.66 and a groove depth d is in a range of 0.85 d.sub.0 .ltoreq.d.ltoreq.1.09 d.sub.0. Excessive heat from infrared light and higher order light may be eliminated without the use of an infrared cutter.

REFERENCES:
patent: 3463914 (1969-08-01), Lutter
patent: 5523815 (1996-06-01), Tamura
Mark's Standard Handbook for Mechanical Engineers, tenth edition, 1996.

Affiliated with

Also associated with

Rating

Illuminating optical system for cutting infrared light by relief does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Illuminating optical system for cutting infrared light by relief, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Illuminating optical system for cutting infrared light by relief will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1143676