Telescope with rear converter and rear conversion lens and teles

Details Telescope with rear converter and rear conversion lens and teles Telescope with rear converter and rear conversion lens and teles

1994-12-23

1996-12-31

Nguyen, Thong

Optical: systems and elements

Compound lens system

359399, 359675, 359646, 359673, 359744, 359674, G02B 2136, G02B 2300, G02B 1502, G02B 1300

Patent

active

055899765

ABSTRACT:
A telescope includes a master telescope whose aberration has been independently corrected and which has an objective lens and an ocular lens. A rear conversion lens is provided on the image side of the objective lens of the master telescope and is made of a single lens having a concave surface that faces an object side. The rear conversion lens meets the requirements defined by the following relationships: f.sub.o '/f.sub.o >1 and 0.5<(dx.sub.2 /dh.sub.2)/(dx.sub.1 /dh.sub.1)<1.3, wherein "f.sub.o " represents the focal length of the objective lens of the master telescope; "f.sub.o '" represents the resultant focal length of the objective lens of the master telescope and the rear conversion lens; "dx.sub.1 /dh.sub.1 " represents an inclination of an incident surface of the rear conversion lens at an incident point thereof, upon which light is incident at a height h.sub.1 ; "dx.sub.2 /dh.sub.2 " represents an inclination of an emission surface of the rear conversion lens at an emission point thereof, at which light is emitted from the rear conversion lens at a height h.sub.2 ;h.sub.1 =0.36(f.sub.o).sup.2 /mf.sub.o ; h.sub.2 =0.36(f.sub.o) /m, and m is the magnification of said master telescope.

REFERENCES:
patent: 4286844 (1981-09-01), Nagler
patent: 4900141 (1990-02-01), Ohshita
patent: 5140467 (1992-09-01), Hotta et al.

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