Share Email Print
cover

Optical Engineering • Open Access

Flat-plate magnifier for magnifying the view of a distant object
Author(s): Masataka Shirasaki; Takehiro Kodaira; Hiroshi Yamaguchi; Tsuneo Takei

Paper Abstract

An optically magnifying device for viewing a distant object is proposed. Since this device can be made in the form of a thin plate and can also have a large viewing area, a flat-plate magnifier is realized. The flat-plate magnifier mounted onto an eyeglass frame as a substitute for each lens provides a light-weight, hands-free magnifier. The flat-plate magnifier is made as a 3 to 4-mm-thick plastic plate and can be made up to 30 to 40 mm in diameter. The flat-plate magnifier is a two-dimensional array of magnifying modules and each magnifying module consists of a micromagnifier and a ray angle adjuster. The micromagnifier comprises a concave mirror and a convex mirror and magnifies the view. The ray angle adjuster is a transparent wedge and expands the viewing area. The flat-plate magnifier is designed so that the achromatic condition is satisfied by cancelling the angular dispersion produced by the micromagnifier with that of the ray angle adjuster. A prototype of the flat-plate magnifier with a diameter of 9 mm and a magnification power of 3 was demonstrated.

Paper Details

Date Published: 19 September 2014
PDF: 11 pages
Opt. Eng. 53(9) 095107 doi: 10.1117/1.OE.53.9.095107
Published in: Optical Engineering Volume 53, Issue 9
Show Author Affiliations
Masataka Shirasaki, Independent (United States)
Takehiro Kodaira, Nittoh Kogaku K.K. (Japan)
Hiroshi Yamaguchi, Nittoh Kogaku K.K. (Japan)
Tsuneo Takei, Nittoh Kogaku K.K. (Japan)


© SPIE. Terms of Use
Back to Top