Lamp unit using short-wave light emitting device

• US 6,501,084 B1
• Filed: 03/31/2000
• Issued: 12/31/2002
• Est. Priority Date: 03/31/1999
• Status: Expired due to Fees

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: Sakai, Kazuhiro, Takahashi, Toshio, Iwasa, Tadanobu, Mukogawa, Takao
• Primary Examiner(s): Berman, Jack
• Assistant Examiner(s): Smith, II, Johnnie L
• Application Number:
  US09/538,946
• Time in Patent Office: 1,005 Days
• Field of Search: 362/249, 250/504.R
• US Class Current: 250/504.00R
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21V 19/004 by deformation of parts or snap action mountings, e.g. using clips
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A short-wave light transmitting diode lamp unit has a printed circuit board disposed in a housing. A plurality of short-wave light emitting diode chips is mounted on the printed circuit board so that a light emission side of the light emitting diode chip faces an opening of the housing. An outer glass as a light transmitting plate is attached to the opening of the housing. The outer glass is made of a glass material having high ultraviolet ray transmittance. The outer glass is prevented from degradation caused by the ultraviolet rays. Thus, the light output efficiency is kept in good level and long lifetime is assured. An overall structure becomes simple, thereby reducing the production costs.

Claims

1. A short-wave light emitting diode lamp unit comprising:

a printed circuit board on which electronic parts are mountable;

a plurality of short-wave light emitting diode chips mounted on the printed circuit board; and

a housing accommodating therein the printed circuit board and the short-wave light emitting diode chips, while having a light transmitting portion provided at least at a location facing a light emission side of the short-wave light emitting diode chip, the light transmitting portion being made of a glass material having high ultraviolet ray transmittance of about 80% or more for ultraviolet rays having a peak wavelength of about 380 nm.

4. A short-wave light emitting diode lamp unit according to claim 1, in which the housing has an airtight structure and is filled with a nitrogen gas therein.

5. A short-wave light emitting diode lamp unit according to claim 1, further comprising a protective film formed on a surface of the short-wave light emitting diode chip, the protective film being made of a transparent resin material having high ultraviolet ray transmittance.

6. A short-wave light emitting diode lamp unit according to claim 1, further comprising a photocatalyst film formed on th e light transmitting portion.

2. A short-wave light emitting diode lamp unit comprising:

a housing having an opening;

a printed circuit board on which electronic parts are mountable, the printed circuit board being disposed inside the housing;

a plurality of short-wave light emitting diode chips mounted on the printed circuit board so that a light emission side of the short-wave light emitting diode chip faces the opening of the housing; and

a light transmitting plate attached to the opening of the housing, the light transmitting plate being made of a glass material having high ultraviolet ray transmittance of about 80% or more for ultraviolet rays having a peak wavelength of about 380 nm.

3. A short-wave light emitting diode lamp unit comprising:

a printed circuit board on which electronic parts are mountable;

a plurality of short-wave light emitting diode chips mounted on the printed circuit board; and

a housing accommodating therein the printed circuit board and the short-wave light emitting diode chips, the housing being made into a tube shape of a glass material having high ultraviolet transmittance of about 80% or more for ultraviolet rays having a peak wavelength of about 380 nm.

7. A short-wave light emitting diode lamp unit comprising:

a printed circuit board on which electronic parts are mountable;

a plurality of short-wave light emitting diode chips mounted on the printed circuit board; and

a resin mold coating the short-wave light emitting diode chip, the resin mold having high ultraviolet ray transmittance.

8. A short-wave light emitting diode lamp unit according to claim 7, further comprising a housing accommodating therein the printed circuit board and the short-wave light emitting diode chips, while having a light transmitting portion provided at least at a location facing a light emission side of the short-wave light emitting diode chip, the light transmitting portion being made of a glass material having high ultraviolet ray transmittance of about 80% or more for ultraviolet rays having a peak wavelength of about 380 nm.

9. A short-wave light emitting diode lamp unit according to claim 7, further comprising:

a spacer placed on an upper surface of the printed circuit board so as to define an accommodating space surrounding the short-wave light emitting diode chips;

a light transmitting plate placed on an upper surface of the spacer so as to shield the accommodating space of the spacer, while facing a light emission side of the short-wave light emitting diode chip, the light transmitting plate being made of a glass material having high ultraviolet ray transmittance of about 80% or more for ultraviolet rays having a peak wavelength of about 380 nm; and

a frame fitted on an upper side of the printed circuit board so that the spacer and the light transmitting plate are held between the printed circuit board and the frame and so that the frame covers an upper surface of the light transmitting plate, the frame having an opening formed at least at a location facing a light emission side of the short-wave light emitting diode chip so as to make the light transmitting plate exposed thereat, thereby permitting a light emitted from the short-wave light emitting diode chip going through the light transmitting plate via the opening.

10. A short-wave light emitting diode lamp unit according to claim 7, in which the resin mold is made of one of a silicone resin, silicone rubber, fluorine-contained resin and fluorine-contained rubber.

11. A short-wave light emitting diode lamp unit according to claim 7, in which the short-wave light emitting diode chips are arrange in a matrix on the printed circuit board, and the resin mold coats each row or each line of the short-wave light emitting diode chips successively and integrally.