GLASS SUBSTRATE WITH LIGHT DIRECTIVITY AND ILLUMINATOR EMPLOYING THE SAME

• Main Authors: EINISHI, TOSHIHIKO, YAMASHITA, NAOTO, KAGA, NAOKO, UMEDA, HIRONORI, SUETSUGU, TATSUYA, KADONO, KOHEI
• Format: Patent
• Language: English; French; German
• Published: 21.05.2008
• Subjects: BLASTING; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GLASS; HEATING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED; JOINING GLASS TO GLASS OR OTHER MATERIALS; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; MINERAL OR SLAG WOOL; NON-PORTABLE LIGHTING DEVICES; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; SYSTEMS THEREOF; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

The present invention provides a high-precision planar light source with a sufficiently uniform luminance and sufficient light directivity to direct light to travel in a specific direction, using a simple production process. More specifically, the invention provides: a glass substrate with light directivity produced by applying a paste containing at least one member selected from the group consisting of lithium compounds, sodium compounds, potassium compounds, rubidium compounds, cesium compounds, copper compounds, silver compounds, and thallium compounds, an organic resin, and an organic solvent to one or both sides of a glass substrate containing an alkali metal as a glass component, and then performing heat treatment at a temperature lower than the softening temperature of the glass substrate; and a planar light source using the glass substrate.