Discharge lamp

Patent metadata

Field	Value
Publication number	US-10354856-B2
Application number	US-201716095909-A
Country	US
Kind code	B2
Filing date	Apr 12, 2017
Priority date	Apr 28, 2016
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A discharge lamp includes a discharge vessel. A xenon gas is sealed within the discharge vessel so as to serve as a light emitting gas, the discharge vessel is made from quartz glass, a pair of electrodes are arranged so as to face each other in the discharge vessel, and the discharge vessel has a chip portion. The chip portion is made from a glass member that has a composition different from that of the discharge vessel, and the glass member has a transmittance of 50% or more over a wavelength range from 170 nm to 300 nm.

First claim

The invention claimed is:

1. A discharge lamp for use with a projector or a general illumination device, the discharge lamp comprising a discharge vessel such that a xenon gas is sealed within the discharge vessel so as to serve as a light emitting gas, the discharge vessel being made from quartz glass, a pair of electrodes being arranged so as to face each other in the discharge vessel, and the discharge vessel having a chip portion and a light emitting part,
the chip portion being disposed on an outer peripheral surface of the light emitting part of the discharge vessel, and made from a glass member that has a composition different from the discharge vessel, and the glass member of the chip portion having a transmittance of 50% or more over an entire wavelength range from 170 nm to 300 nm.

2. The discharge lamp for use with a projector or a general illumination device according to claim 1 , wherein the chip portion is made from quartz glass that contains metallic impurities 1 ppm or less.

3. The discharge lamp for use with a projector or a general illumination device according to claim 1 , wherein a concentration of an OH group of the glass member that constitutes the chip portion is between 100 ppm and 400 ppm.

4. The discharge lamp for use with a projector or a general illumination device according to claim 2 , wherein a concentration of an OH group of the glass member that constitutes the chip portion is between 100 ppm and 400 ppm.

5. The discharge lamp for use with a projector or a general illumination device according to claim 1 , wherein the quartz glass of the discharge vessel has a greater capability of absorbing ultraviolet light than the glass member of the chip portion, and
the glass member of the chip portion only has a transmittance of 50% or more over an entire wavelength range from 170 nm to 300 nm.

6. The discharge lamp for use with a projector or a general illumination device according to claim 5 , wherein the discharge vessel is made from fused quartz glass, and the chip portion is made from synthetic quartz glass.

Assignees

• Ushio Electric Inc

Inventors

• Sasaki Yuichi
• Yamane Takumi

Classifications

• H01J61/86

  with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection · CPC title

• H01J7/22

  Tubulations therefor, e.g. for exhausting; Closures therefor · CPC title

• H01J61/16

  having helium, argon, neon, krypton, or xenon as the principle constituent · CPC title

• C03C3/06 Primary

  with more than 90% silica by weight, e.g. quartz {(C03C3/045 takes precedence)} · CPC title

• H01J61/302

  characterised by the material of the vessel · CPC title