Light-selective prism, projection display apparatus using the same, and method of manufacturing light-selective prism
US6411449B1 · kind B1 · utility
13Cited by
10References
8Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 1, 1999 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Apr 1, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A red-reflecting film and a blue-reflecting film are formed in a substantially X shape on joint surfaces defined by the respective side faces of four columnar prisms or right-angle prisms. The red-reflecting film is continuously formed without separating at an intersection of the two reflecting films. The blue-reflecting film is, on the other hand, divided into two pieces by the red-reflecting film and an adhesive. It is preferable that that four columnar prisms are obtained from one block of sheet glass. This arrangement ensures an improvement in properties of a resulting light-selective prism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.