Patent · US Active

Combined retardation optical device

US7965442B2 · kind B2 · utility

0Cited by

2References

6Claims

0Family size

Assignee

National Taiwan University of Science and Technology · TW

Inventors

Chao Chen · Taipei, TW
Jr-Rung Chen · Taoyuan, TW

Key dates

Filing date	Jun 9, 2008
Grant date	Jun 21, 2011
Priority date	—
Expiry date	Jul 15, 2029

Classification

Technology area (CPC G)Physics
CPC primaryG02B27/286
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A combined retardation optical device includes a first retardation optical plate and a second retardation optical plate. The second retardation optical plate contains a flat portion and a multi-step portion. This multi-step portion has several step-like flat surfaces with predetermined heights. The flat portion contacts with the first retardation optical plate. Both the first retardation optical device and the second retardation optical plate are made from birefringent materials. This invention is easy to switch to a different retardation condition for observation. Plus, there is no need to adjust or replace any element.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.