Patent · US Expired

Apparatus for creating an even illumination of a plurality of title blocks

US4443835A · kind A · utility

22Cited by

3References

16Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Rolf Brautigam · Remscheid, DE
Jurgen Wesemeyer · Nuremberg, DE
Hartmut Zobl · Ergolding, DE

Key dates

Filing date	Aug 31, 1981
Grant date	Apr 17, 1984
Priority date	—
Expiry date	Aug 31, 2001

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S362/812
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A diaphragm having a plurality of apertures each associated with a title block on the front panel of an indicator unit is provided to cause the various title blocks to be illuminated evenly from a light source positioned behind the diaphragm. The size, number and shape of the apertures is so chosen that all of the title blocks are equally illuminated regardless of their size and regardless of their distance to the light source. Indirect light is used to prevent the formation of shadows and light spots on the title blocks.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.