Illumination – Illuminated scale or dial – Internal light source
Patent
1997-04-17
1998-11-24
Sember, Thomas M.
Illumination
Illuminated scale or dial
Internal light source
362 23, 362 84, 116286, G01D 1128
Patent
active
058398104
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/DE95/01664 field on Nov. 25, 1995.
BACKGROUND INFORMATION
German Patent Application No. 29 13 139 describes an illuminated measurement pointer. In this a dial face, over which a pointer is rotatably mounted, is applied onto a disk that is at the same time light-conveying. Light is coupled into the light-conveying disk by means of a lamp. The light emerges from the light-conveying disk through the dial face toward an observer, thus serving to illuminate the dial face.
SUMMARY OF THE INVENTION
The display gauge according to the present invention advantageously reduces the installation depth of the display gauge because of the flat design of electroluminescent displays. In addition, the display gauge according to the present invention consumes particularly little current, since the light yield of the electroluminescent display is relatively high. The display gauge according to the present invention is moreover particularly economical to manufacture, since in addition, no optically transparent material is required as a light guide.
Conductor paths on the back of the support plate serve, advantageously, to connect the electrical components to an electrical circuit. Conductor paths can moreover be produced very easily on the support plate by means of known methods, for example photolithography or screen printing.
The electroluminescent display can be adhesively bonded in the form of a finished display, in particular as available commercially, onto the support plate, but can also be produced in particularly space-saving and uncomplicated fashion by printing the individual components for the electroluminescent display onto the support plate.
A connection from the electroluminescent display to the electrical components on the back side of the support plate can be made in very space-saving fashion by means of through-contacting, and in very uncomplicated fashion with a contact element extending around one edge of the support plate.
The electroluminescent display can be manufactured particularly simply, and at the same time is particularly easy to activate, by the fact that an electroluminescent layer is applied, together with a structured electrically conductive layer, onto a common support layer that is guided from the front side of the support plate to the back side of the support plate, in particular because the electrically conductive layer on the back side of the support plate can serve to deliver signals to activate the electroluminescent layer.
If the electrically conductive layer on the back side of the support plate is populated with electrical components, there results the advantage that the electrically conductive layer can at the same time comprise the supply contacts for the electroluminescent layer, and can serve as a layer, having conductor paths, for an electrical circuit.
The display gauge according to the present invention is particularly easy to manufacture if the support layer, along with at least the electrically conductive layer applied thereonto, is flexible, since the support layer can be produced first, along with the electroluminescent layer and the electrically conductive layer, on a planar surface of the flexible support layer, and then a simple bending of the support layer, along with at least the electrically conductive layer, around the support plate can serve to connect the front side and the back side of the support plate correspondingly to the support layer.
An adhesive bonding procedure proves to be particularly cost-saving for mounting the support layer on the support plate.
The same also applies to mounting of the dial face on the electroluminescent layer.
The display gauge according to the present invention is particularly suited for being combined with a pointer drive mechanism and a pointer driven thereby, by the fact that a recess in the support plate for passage of the shaft of the pointer drive mechanism serves, since it is particularly simple in terms of production engineering, to arrange a recess in the arrangement consisting of supp
REFERENCES:
patent: 2908806 (1959-10-01), Cohen
patent: 3069509 (1962-12-01), Sherron
patent: 3219008 (1965-11-01), Harris et al.
Friedl Bernhard
Hersel Walter
Mueller-Sybrichs Ralf
Oreans Derk
Robert & Bosch GmbH
Sember Thomas M.
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