Lens of gradient dielectric constant and methods of production
US6433936B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2001 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Aug 15, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/0006
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is a lens of gradient dielectric constant and methods for the production of same. The lens includes an inner core comprising a cured or fused substantially homogenous blend of glass spheres, curable or fusible binder and, as needed to increase dielectric constant, a low-loss dielectric material. The inner core preferably has a dielectric constant of about 2.0, and an interstitial void volume (representing trapped air space between elements of the cured or fused material) of from about 30% to about 50%. The lens also includes an outer shell layer comprising a cured or fused substantially homogenous blend of hollow glass spheres and curable or fusible resin. The outer shell layer preferably has a dielectric constant of about 1.0, and an interstitial void volume of from about 30% to about 50%. In addition, the lens includes a minimum of one, and preferably two or more intermediate layers, the intermediate layers having a dielectric constant falling between 1 and 2. The intermediate layers are comprised of a cured substantially homogenous blend of glass spheres, resin and, as needed to increase dielectric constant, a low-loss dielectric material. As is the case with the inner…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.