Self-ballasted lamp having a light-transmissive member in contact with light emitting elements and lighting equipment incorporating the same

• US 8,678,618 B2
• Filed: 09/20/2010
• Issued: 03/25/2014
• Est. Priority Date: 09/25/2009
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Lighting & Technology Corporation (Toshiba Corporation)
• Inventors: Sakai, Makoto, Shibano, Nobuo, Nishimura, Kiyoshi, Ogawa, Kozo, Kamata, Masahiko, Tanaka, Toshiya, Matsuda, Shuhei, Segawa, Masao, Watanabe, Miho
• Primary Examiner(s): MAY, ROBERT J
• Application Number:
  US12/885,849
• Publication Number:
  US 20110074290A1
• Time in Patent Office: 1,282 Days
• Field of Search: 362/294, 362/373, 362/311.02, 362/267, 36224902-24903, 362/249.04, 362/249.16, 362/363
• US Class Current: 362/294
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21Y 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2107/40 on the sides of polyhedrons, e.g. cubes or pyramids
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A self-ballasted lamp includes: a base body; a light-emitting module and a globe which are provided at one end side of the base body; a cap provided at the other end side of the base body; and a lighting circuit housed between the base body and the cap. The light-emitting module has light-emitting portions each using a semiconductor light-emitting element, and a support portion projected at one end side of the base body, and the light-emitting portions are disposed at least on a circumferential surface of the support portion. A light-transmissive member is interposed between the light-emitting module and an inner face of the globe.

Claims

1. A self-ballasted lamp comprising:

a base body comprising a partitioning wall portion projected at one end side and a heat radiating portion exposed to an outside on another end side opposite the one end side;

a light-emitting module which is supported by a support portion and comprises;

a plurality of light-emitting portions, each including a semiconductor light-emitting element, and

the support portion projected at the one end side of the base body, and in or on which the plurality of light-emitting portions are respectively disposed at least on a circumferential surface of the support portion;

a globe which is provided at the one end side of the base body so as to cover the light-emitting module;

a light-transmissive member filled between the light-emitting module and an inner face of the globe so as to be in contact with the semiconductor light-emitting element and the support portion, and thermally conducting heat of the semiconductor light-emitting element to the globe;

a cap provided at the another end side of the base body opposite to the one end side;

a lighting circuit housed between the partitioning wall portion of the base body and the cap; and

an insulating unit interposed between the support portion and the partitioning wall portion.

2. The self-ballasted lamp according to claim 1, wherein

a distance between the light-emitting portions of the light-emitting module and the inner face of the globe is 2 mm or less.

3. The self-ballasted lamp according to claim 1, wherein

the insulating unit has a thermal conductivity of 0.1 W/mk or less.

4. The self-ballasted lamp according to claim 1, wherein

the light-transmissive member is made of silicone resin in which light-diffusing materials are dispersed.

5. Lighting equipment comprising:

an equipment body having a socket; and

the self-ballasted lamp according to claim 1 which is attached to the socket of the equipment body.

6. The self-ballasted lamp according to claim 1, wherein

the light-transmissive member fills a gap between the light-emitting surface of the light emitting portions and the inner face of the globe.