Fuji Jukogyo Kabushiki Kaisha

Hisaya Takahashi

Atsushi Namba

Toshiya Arakawa

Mikio Ono

Provided herein is a light-emitting apparatus capable of achieving both improved durability and higher brightness with an inexpensive and simple construction. A heat resistant glass substrateis mounted in a vacuum chamber, and while an anode electrode(and a light emitter) is mounted on the glass substrate, the glass substrateis separated from a glass substrate. This precisely protects the vacuum chamberfrom thermal damage due to light emission upon excitation, even when the current density between the cathode electrodeand the anode electrodeis controlled at a high level to cause the light emitterto emit light at high brightness. Accordingly, this eliminates the need to make the entire vacuum chamberexcessively heat-resistant, permitting construction from an inexpensive material such as soda-lime glass; consequently both improvements in the durability of the light-emitting apparatusand enhancement in brightness thereof can be accomplished with an inexpensive and easy construction.

Light-emitting apparatus having a heat-resistant glass substrate separated through a vacuum layer from a glass substrate used as the light projection plane

Provided herein is a light-emitting apparatus which is capable of causing the light emitted at the entire face of a fluorescent material to be exteriorly emitted with no interference and with enhanced light emission efficiency, thereby attaining an exteriorly radiated high brightness light. A cathode electrodeis mounted on a periphery of a transmission member, the anode electrodeis also mounted on a domain opposite to a light transmission member, and the surfaceof the fluorescent materialto be mounted on a top layer of the anode electrodeis formed with a concave face. In accordance therewith, even when the cathode electrodeis offset mounted on a periphery of the light transmission memberit can be caused to precisely face the surfaceof the fluorescent materialand the excitation light from the entire face of the surfaceof the fluorescent materialcan made incident onto the light transmission memberwithout interference from the cathode electrodeor the like.

Light-emitting apparatus

A light-emitting apparatus of the present invention maintains an anode electrodeat a higher positive electric potential than a cathode electrode, applies an electric field to a cold-cathode electron emission sourceby controlling a gate voltage applied to the cathode electrodewith a gate electrode, and emits excitation light from a phosphorirradiated by an electron beam released from the cold-cathode electron emission source. The light-emitting apparatus of this invention emits the excitation light not only from the opposite side of the electron beam-irradiated surface of the phosphorthrough a glass substrate, but also from the electron bean-irradiated surface of the phosphorby reflecting the excitation light with a gate reflection surfaceon the gate electrodeand emitting it through an unobstructed area Ro of the glass substrate. This eliminates the wasted excitation light emitted and absorbed within the apparatus as in the conventional light-emitting apparatuses to thereby improve the luminous efficiency and substantially increase the amount of light emitted outside from the entire illumination surface.

Growing community of inventors

Kanagawa, Japan

Hisaya Takahashi