Title:
【発明の名称】超広帯域色消しレンズ
Document Type and Number:
Japanese Patent JP2683463
Kind Code:
B2
Abstract:
An ultra-wide band achromatic lens which provides simultaneous multiband coverage from the visible to the very near infrared range of the energy spectrum. The lens (10) is made of three alternating elements 12, 14 and 16 of calcium fluoride or magnesium oxide in relative optical alignment. In a first embodiment, the elements are arranged in a Cooke triplet with a first positive (convergent) element 12 of calcium fluoride, a second negative (divergent) element 14 of magnesium oxide, and a third positive element 16 of calcium fluoride. In a second embodiment, a wide-angle triplet is provided with a first negative element 12 of magnesium oxide, a second positive element 14 of calcium fluoride, and a third element 16 of magnesium oxide. In both embodiments, the invention provides an achromatic optical system which is simultaneously corrected for chromatic and other aberrations over the multiband wavelength range from the visible to the very near infrared portion of the energy spectrum, i.e., .5 microns to 5 microns.
Inventors:
Caesar A Sepulveda
Application Number:
JP17547791A
Publication Date:
November 26, 1997
Filing Date:
July 16, 1991
Export Citation:
Assignee:
Santa Barbara Research Center
International Classes:
G02B1/02; G02B9/06; G02B9/16; G02B13/14; (IPC1-7): G02B13/14; G02B1/02; G02B9/16
Domestic Patent References:
| JP5969711A | ||||
| JP5789715A |
Other References:
久保田広外２名編 「光学技術ハンドブック」 （昭４３−１０−２５） 朝倉書店 ＰＰ．９６６〜９６７
Attorney, Agent or Firm:
Takehiko Suzue