Discharge lamp device

• US 5,220,235 A
• Filed: 08/11/1992
• Issued: 06/15/1993
• Est. Priority Date: 04/20/1990
• Status: Expired due to Fees

• Current Assignee: Koito Manufacturing Company Limited
• Original Assignee: Koito Manufacturing Company Limited
• Inventors: Yoshida, Yonemasa, Nagasawa, Masakazu, Irisawa, Shinichi, Numajiri, Yasuyoshi, Wakimizu, Yukio
• Primary Examiner(s): Yusko, Donald J.
• Assistant Examiner(s): Patel, Ashok
• Application Number:
  US07/927,722
• Time in Patent Office: 308 Days
• Field of Search: 313/25, 313/112, 313/113, 313/315, 313/318, 362/255, 362/293, 315/73
• US Class Current: 313/25
• CPC Class Codes: H01J 61/34 Double-wall vessels or containers
• CPC Class Codes: H01J 61/40 by light filters; by coloured coatings in or on the envelope
• CPC Class Codes: H01J 61/82 Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr

Abstract

A discharge lamp device having an insulator base made of a synthetic resin integrally bonded to a globe holding member made of ceramic wherein a discharge lamp is attached. Also provided is a pair of lead supports for supporting the discharge lamp at its opposite ends. The discharge lamp and lead supports are completely surrounded by an ultraviolet ray shielding globe which is fixed to globe holding member. The globe effectively absorbs harmful ultraviolet rays having a wavelength in a predetermined wavelength range.

Claims

1. A discharge lamp device comprising:

a discharge lamp;

an insulating base member comprising a globe holding portion made of ceramic integrally fixed to a front surface of a base portion made of synthetic resin;

an ultraviolet ray shielding globe surrounding said discharge lamp, said globe having a closed forward end portion and an open rearward end portion; and

a pair of lead supports projecting forward from said insulating base member for supporting said discharge lamp, wherein said open rearward end portion of said globe is fixed to said globe holding portion so that said open globe is fixed to said globe holding portion so that said open rearward end portion is closed and said discharge lamp and said pair of lead supports are completely covered.

2. The discharge lamp device as claimed in claim 1, wherein said globe is covered with an ultraviolet ray absorbing film for absorbing ultraviolet rays emitted by said discharge lamp.

3. The discharge lamp device as claimed in claim 1, wherein said globe is cylindrically shaped.

4. The discharge lamp device as claimed in claim 1, wherein said lead supports support said discharge lamp at the opposite ends of said discharge lamp.

5. The discharge lamp device as claimed in claim 1, wherein a plurality of air vents are provided communicating from said front surface side of said base to a side of said base for providing permeability between the inside and outside of said globe.

6. The discharge lamp device as claimed in claim 5, wherein said base portion has formed therein at least one groove and said globe holding portion has formed therein at least one hole, said at least one groove and said at least one hole being arranged such as to form said plurality of air vents.

7. The discharge lamp device as claimed in claim 1, wherein said base portion and said globe holding portion have holes formed therein for inserting said pair of lead-supports therethrough, said pair of lead-supports being inserted through an insulator cylindrical body thereby preventing any of said ultraviolet rays from being emitted to said outside of said globe via said base portion and said globe holding portion holes.

8. The discharge lamp device as claimed in claim 7, wherein said insulator cylindrical body is made of ceramic and is adhesively fixed to said holes of said base portion and said globe holding portion.

9. The discharge lamp device as claimed in claim 2, wherein said ultraviolet ray shielding film is a multi-layer film, said multi-layer film absorbing a first set of ultraviolet rays having a predetermined wavelength and causing the cancellation of a second set of ultraviolet rays having a second predetermined wavelength.

10. The discharge lamp device as claimed in claim 2, wherein a thickness of said ultraviolet ray shielding film varies along a longitudinal direction of said globe so that absorption of said ultraviolet rays remains uniform along said longitudinal direction of said globe.

11. A discharge lamp device comprising:

a discharge lamp;

an insulating base member made of synthetic resin having formed to a front surface thereof metal fittings for fixing to said front surface a globe-holding plate made of ceramic by bending said metal fittings, said globe-holding plate having lead-support insertion holes formed therein;

a pair of lead supports for supporting said discharge lamp projecting from said insulating base member through said lead-support insertion holes of said globe-holding plate; and

an ultraviolet ray shielding globe for surrounding said discharge lamp, said globe having an open end portion, said open end portion being fixedly bonded to said globe holding plate by an inorganic adhesive agent;

wherein ultraviolet rays emitted by said discharge lamp are completely absorbed by said ultraviolet ray shielding globe and prevented from being emitted to the outside of said globe.