Lens system for moisture sensor device
US5278425A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1993 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | Jan 19, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/02
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A moisture sensor device for detecting the degree of wetting of a transparent pane by drop-shaped precipitation. The sensor device is provided with a beam guide element, which is affixed to the pane by an optical adhesive. A beam transmitter and a beam receiver are each associated with a lens. Such a sensor device solves the problem of guaranteeing optimum conditions for the generation and output of rays into and out of a beam guide element. Aspherical lenses are associated with and arranged at a short distance from the beam transmitter and the beam receiver. Each lens has a surface facing the beam transmitter or beam receiver which in outline is fashioned according to a polynomial selected to be equal to or greater than the third degree and is developed to form a body of rotation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.