Optical: systems and elements – Compound lens system – Variable magnification
Patent
1994-09-01
1995-12-26
Nguyen, Thong Q.
Optical: systems and elements
Compound lens system
Variable magnification
359409, 359420, 359421, G02B 2300
Patent
active
054792932
ABSTRACT:
A portable apparatus useful for close range physical examinations, in particular for use as a colposcope, is described. The portable apparatus includes a stereoscopic optical unit, a main frame lens holder, an auxiliary frame lens holder, a light and mount therefor, a filter and mount therefor, and support structure which allows the component parts to be maintained in precise optical alignment and allows the apparatus to be worn by a user in the manner of eyeglasses. These components are constructed and arranged to provide for an undistorted short focal length and magnification as necessary for clear close range visualization of body tissue. The apparatus provides for increased magnification so that visualization of blood vessels and the like can be readily discerned without the need for bulky expensive equipment. This allows for screening and earlier diagnosis in a time and cost efficient manner.
REFERENCES:
patent: 4274128 (1981-06-01), Malis
patent: 4488790 (1984-12-01), Beecher
patent: 4637696 (1987-01-01), Wilkins
patent: 4886340 (1989-12-01), Kanda
patent: 5249002 (1993-09-01), Chou et al.
"Beecher Mirage" binocular system brochure published by Beecher Research Company--2 pages.
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