G - Physics – 02 – B
Patent
G - Physics
02
B
88/106
G02B 9/34 (2006.01) G02B 11/20 (2006.01) G02B 25/00 (2006.01)
Patent
CA 1084744
Title: Magnifier. Abstract of the disclosure: A magnifier having a relative aperture exceeding f/1, an angle of view wider than 2 x 25°, and a pupil distance longer than 0.9 f, in particular for viewing the anode screen of an image intensifier tube forming part, for example, of a viewing device mounted on a vehicle. As viewed in the direction of the observer, the magnifier comprises, in succession, a) a first component consisting of a positive lens; b) a second component consisting of a positive power lens; c) a third component consisting of a meniscus-shaped lens concave to the observer and comprising two lens components cemented together; d) a fourth component consisting of a positive power lens; the sum of the powers of the two refractive surfaces of the second component having a value of between 0.15/f and 0.55/f, the power of the refractive surface of the third component facing the observer having a value of between 0.63/f and 1.03/f, and the sum of the powers of the two refractive surfaces of the fourth component ranging from 0.45/f to 0.65/f. The magnifier has a large pupil distance, so that the scene on which the viewer is focussed can be properly observed even when the vehicle moves in a bumpy terrain, and yet has a back focal length long enough to allow the use of a plane parallel-sided plate on the anode screen of the image intensifier tube in a thickness sufficient to diminish light diffraction effects and internal reflections therein.
273014
Fetherstonhaugh & Co.
N. V. Optische Industrie "de Oude Delft"
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