GB305227A - Improvements in or relating to incandescent electric lamps - Google Patents
Improvements in or relating to incandescent electric lampsInfo
- Publication number
- GB305227A GB305227A GB3449/29A GB344929A GB305227A GB 305227 A GB305227 A GB 305227A GB 3449/29 A GB3449/29 A GB 3449/29A GB 344929 A GB344929 A GB 344929A GB 305227 A GB305227 A GB 305227A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bulb
- reflector
- glass
- coincident
- relating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/28—Envelopes; Vessels
- H01K1/32—Envelopes; Vessels provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/162—Incandescent light sources, e.g. filament or halogen lamps
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
305,227. Pech, J. L. Feb. 3, 1928, [Convention date]. Bulbs. - Portions of the bulb of an electric lamp, which serves as an extra-focal luminous source in a reflector, are rendered opaque to prevent the passage of rays that would be submitted to double reflection between the glass bulb and the reflector and would give rise to virtual luminous points not coincident with the luminous source. The bulb A, Fig. 1, has a rectilinear filament B which is coincident with the axis CD of the parabolic reflector E, of which the focus is indicated at F. The portion M, defined by the line HI, is rendered opaque by means of a varnish or paint which may be incorporated in the glass, or applied, internally or externally, to the bulb. A translucent substance may be used such that the resultant rays from the reflector after reflection from the glass bulb are negligible. Reference has been directed by the Comptroller to Specifications 10146/12, 18549/12, 203,471 and 269,029.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR648112T | 1928-02-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB305227A true GB305227A (en) | 1930-06-02 |
Family
ID=9002458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3449/29A Expired GB305227A (en) | 1928-02-03 | 1929-02-01 | Improvements in or relating to incandescent electric lamps |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR648112A (en) |
| GB (1) | GB305227A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0470496A3 (en) * | 1990-08-07 | 1992-08-26 | Toshiba Lighting & Technology Corporation | Incandescent lamp and reflector type projection lamp |
-
1928
- 1928-02-03 FR FR648112D patent/FR648112A/en not_active Expired
-
1929
- 1929-02-01 GB GB3449/29A patent/GB305227A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR648112A (en) | 1928-12-05 |
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