Portable unitary battery powered hand-held magnifying apparatus

Details Portable unitary battery powered hand-held magnifying apparatus Portable unitary battery powered hand-held magnifying apparatus

Filed on

1983-03-07

Date issued

1986-03-25

Examiner

Punter, William H.

Other Related Categories

350250, G02B 2502, G02B 2704

Type

Patent

Status

active

Patent number

045779279

Description

ABSTRACT:
A portable unitary battery powered hand-held magnifying apparatus which is especially useful for examining gems includes a tubular battery casing with a penlight bulb mounted at its end to provide the necessary dark field illumination for showing inclusions in a gem. A ten power triplet type magnifying lens is hingedly mounted to the end of the tube for convenient carrying but when moved 90.degree. its lens' axis is then perpendicular to the nominal light axis. The light bulb is in a parabolic reflector to provide substantially parallel rays. The focal distance of the lens is at the light axis where a gem would be placed for examination.

REFERENCES:
patent: 2150916 (1939-03-01), Forgea
patent: 2178371 (1939-10-01), Eichenberger
patent: 3837735 (1974-09-01), Guillet
"The Optical Industry & Systems Directory" 1976, Published by the Optical Publishing Co., pp. D-23.

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