Crystal diffraction lens with variable focal length

Details Crystal diffraction lens with variable focal length Crystal diffraction lens with variable focal length

1988-12-29

1991-04-02

Arnold, Bruce Y.

X-ray or gamma ray systems or devices

Photographic detector support

Dental

350607, 350610, 350360, 35016217, 378 84, 378145, G02B 2600, G02B 2744, G02B 518, G21K 106

Patent

active

050043196

ABSTRACT:
A method and apparatus for altering the focal length of a focusing element o one of a plurality of pre-determined focal lengths by changing heat transfer within selected portions of the element by controlled quantities. Control over heat transfer is accomplished by manipulating one or more of a number of variables, including: the amount of heat or cold applied to surfaces; type of fluids pumped through channels for heating and cooling; temperatures, directions of flow and rates of flow of fluids; and placement of channels.

REFERENCES:
patent: 2853617 (1958-09-01), Berreman
patent: 4190327 (1980-02-01), Hughes
patent: 4253739 (1981-03-01), Carlson
patent: 4314742 (1982-02-01), Dye et al.
patent: 4382657 (1983-05-01), Lemaitre
patent: 4415234 (1983-11-01), Meyers
patent: 4426131 (1984-01-01), Gowan
patent: 4429411 (1984-01-01), Smither
patent: 4461018 (1984-07-01), Ice et al.
patent: 4737973 (1988-04-01), Ogawa et al.

Affiliated with

Also associated with

Rating

Crystal diffraction lens with variable focal length does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Crystal diffraction lens with variable focal length, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crystal diffraction lens with variable focal length will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-324212