Magnification device lens assembly

Details Magnification device lens assembly Magnification device lens assembly

1994-07-21

1996-11-12

Fulton, Christopher W.

Geometrical instruments

Straight-line light ray type

Multisight line

33251, G03B 1302, G02B 2500

Patent

active

055727956

ABSTRACT:
A magnification device lens assembly for sharpening the focus of the field of view of a magnification device to provide greater accuracy includes a base portion having first and second apertured ends; the first end being interconnected with a magnification device lens; and an extension portion extending outwardly from the second end of the base portion; the first end of the extension portion being interconnected with the second end of the base portion and the second end of the extension portion having an aperture with a diameter smaller than the diameter of the base portion and smaller than the magnification device lens for sharpening the focus of the field of view of the magnification device.

REFERENCES:
patent: 42983 (1864-05-01), Wood
patent: 1353151 (1920-09-01), Deming
patent: 3315362 (1967-04-01), Palmer
patent: 3381381 (1968-05-01), Ruchlis
patent: 3390931 (1968-07-01), Luning et al.
patent: 4283860 (1981-08-01), Rucker
patent: 4850113 (1989-07-01), Doll
patent: 4926560 (1990-05-01), Kilgore et al.
patent: 5201135 (1993-04-01), Cowles

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