Claims
- 1. A method for making viewers for different working distances, comprising the steps of:
- (a) providing eyepieces, each eyepiece defining a first curved surface and a second curved surface, said first curved surfaces of all of said eyepieces having the same radii of curvature and the second curved surfaces having various radii of curvature;
- (b) providing a lens barrel adapted to receive an objective lens and one of said eyepieces;
- (c) assembling one of said eyepieces to one end of said lens barrel such that said second curved surface faces outwardly;
- (d) providing objective lenses, each objective lens defining a first curved surface and a second curved surface, the radii of curvatures for said first curved surfaces of each of said objective lenses being the same, and the radii of curvatures for said second curved surface for each of said objective lenses being the same; and
- (e) assembling an objective lens to an opposing end of said lens barrel such that it faces said first curved surface of one of said eyepieces to form a viewer with a predetermined working distance, said working distance being changed by changing the radii of curvature for said second curved surface of said one eyepiece with the same radii of curvature of said first and second surfaces of said objective lens.
- 2. The method for making viewers as recited in claim 1, wherein said objective lenses are doublet lenses.
Parent Case Info
This application is a Divisional of application Ser. No. 08/114,870, filed on Aug. 31, 1993, now U.S. Pat. No. 5,463,500.
US Referenced Citations (21)
Divisions (1)
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Number |
Date |
Country |
Parent |
114870 |
Aug 1993 |
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