Title:
フィラメントランプ
Document Type and Number:
Japanese Patent JP7393735
Kind Code:
B2
Abstract:
To provide a filament lamp in which removal of a reflection film formed inside an arc tube is suppressed.SOLUTION: A filament lamp comprises: a cylindrical arc tube which exhibits transmissivity to light; a filament which extends in the arc tube along a tube axis direction of the arc tube; and a reflection film which extends in the tube axis direction of the arc tube, and whose cross-sectional shape formed when being cut by a plane perpendicular to the tube axis direction of the arc tube has a first end and a second end in a circumferential direction of an inner wall surface of the arc tube. The reflection film is configured such that, in the circumferential direction of the arc tube, a film thickness at the first end and the second end is thinner than a film thickness at a central portion located between the first end and the second end.SELECTED DRAWING: Figure 1
Inventors:
Tadakazu Kawamura
Takafumi Mizoshiri
Satoru Furue
Takafumi Mizoshiri
Satoru Furue
Application Number:
JP2020000957A
Publication Date:
December 07, 2023
Filing Date:
January 07, 2020
Export Citation:
Assignee:
Ushio, Inc.
International Classes:
H01K1/32; H01K1/28; H05B3/44
Domestic Patent References:
| JP2010177027A | ||||
| JP59058752A | ||||
| JP52074635A | ||||
| JP60054159A | ||||
| JP2006302719A |
Foreign References:
| US20090316268 | ||||
| US5536991 |
Attorney, Agent or Firm:
Patent Attorney Corporation Junias International Patent Office