초록 ▼

A microwave lens is constructed of a homogeneous body of closed cell rigid polyurethane foam with aluminum flakes dispursed throughout and having a configuration defining an axis and opposed lens surfaces. The method of the invention includes selecting a mold having a cavity of the appropriate confi

A microwave lens is constructed of a homogeneous body of closed cell rigid polyurethane foam with aluminum flakes dispursed throughout and having a configuration defining an axis and opposed lens surfaces. The method of the invention includes selecting a mold having a cavity of the appropriate configuration, preheating the mold, and filling the mold with a mixture of low density polyurethane foam components and fine aluminum flakes evenly dispersed throughout the foam structure allowing the mixture to cool and form a body of the appropriate configuration.

대표청구항 ▼

A method of making a microwave lens comprising the steps of: selecting a mold having a cavity of the desired configuration for the controlled directing of microwaves; polishing the walls of said cavity; preheating said mold to a predetermined temperature; selecting and preparing a mixture consisting

A method of making a microwave lens comprising the steps of: selecting a mold having a cavity of the desired configuration for the controlled directing of microwaves; polishing the walls of said cavity; preheating said mold to a predetermined temperature; selecting and preparing a mixture consisting of low density polyurethane foam components and fine aluminum flakes; filling said mold cavity with said mixture; selecting a venting cover having a predetermined venting characteristic; installing the cover on the mold cavity; allowing the mold to cool and simultaneously allowing the contents to expand and cool; opening said mold by removing said venting cover; and removing the formed lens from the mold.