Aspheric projection lens system utilizing concave image

Details Aspheric projection lens system utilizing concave image Aspheric projection lens system utilizing concave image

1978-12-11

1981-02-03

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358237, 350443, H04N 931, H04N 574, G02B 304

Patent

active

042492050

ABSTRACT:
An aspheric projection lens system utilizes a single element aspheric projection lens for projecting a concave image from a concave cathode ray tube face plate, or the like onto a suitable projection surface.

REFERENCES:
patent: 2172775 (1939-09-01), Schmidt-Ott et al.
patent: 2530397 (1950-11-01), Merte
patent: 2884833 (1959-05-01), Pohl
Rumsey, "A `Sky Lens` for an Auroral Spectrograph", Optica Acta, vol. 8, No. 1, Jan. 1961, pp. 17-19. _

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