Image-erecting viewing optical system

Details Image-erecting viewing optical system Image-erecting viewing optical system

2005-01-25

2005-01-25

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Compound lens system

Telescope

C359S834000, C396S382000, C396S384000

Reexamination Certificate

active

06847482

ABSTRACT:
An image-erecting viewing optical system includes a first prism having an incident surface and at least two reflection surfaces, a front lens group of an objective optical system, a second prism having an incident surface and at least two reflection surfaces, a rear lens group of the objective optical system, a field stop, and an eyepiece optical system, in this order from the object. One reflection surface of the first or second prism includes a roof-mirror surface. The following conditions are satisfied:in-line-formulae description="In-line Formulae" end="lead"?sin(θ−ω′)>1
  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?6°<ω<16°  (2)in-line-formulae description="In-line Formulae" end="tail"?whereinθ designates an angle between the incident surface and the first reflection surface of the first prism;ω designates a real field-of-view ω (half amount);ω′ designates an angle between a light ray of a real field-of-view ω (half amount) and the optical axis within the first prism; andn designates the refractive index of the first prism.

REFERENCES:
patent: 5640632 (1997-06-01), Koyama et al.
patent: 6094315 (2000-07-01), Aoki
patent: 6157483 (2000-12-01), Watanabe
patent: 6384969 (2002-05-01), Kanai et al.
patent: 10282422 (1998-10-01), None

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