Lens for a visual alarm detector
US12094326B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2019 |
| Grant date | Sep 17, 2024 |
| Priority date | — |
| Expiry date | Jun 19, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A dome lens extending upwardly about a center axis A and outwardly in a radial direction R, having: a first portion forming a first annular ring about the center axis A that includes a first inner surface that is convex, and being oriented so that a first tangent to the first inner surface is at a first angle to the center axis A that is less than forty-five degrees; a second portion being continuous with the first portion and forming a second annular ring about the center axis A and including a second inner surface that is convex, and being oriented so a second tangent to the second inner surface is canted toward the center axis A; a third portion being continuous with the second portion to enclose the lens, forming an annular solid disk about the center axis A, and including a third inner surface that is convex.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.