GB764464A - Improvements in and relating to dial or panel lighting - Google Patents
Improvements in and relating to dial or panel lightingInfo
- Publication number
- GB764464A GB764464A GB2521/55A GB252155A GB764464A GB 764464 A GB764464 A GB 764464A GB 2521/55 A GB2521/55 A GB 2521/55A GB 252155 A GB252155 A GB 252155A GB 764464 A GB764464 A GB 764464A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dial
- lamp
- edge
- parabolic
- electric
- 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
-
- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B19/00—Indicating the time by visual means
- G04B19/30—Illumination of dials or hands
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G9/00—Visual time or date indication means
- G04G9/0023—Visual time or date indication means by light valves in general
- G04G9/0029—Details
- G04G9/0035—Details constructional
- G04G9/0041—Illumination devices
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Details Of Measuring Devices (AREA)
Abstract
764,464. Indicating-apparatus. GENERAL ELECTRIC CO. Jan. 27, 1955 [Jan. 27, 1954], No. 2521/55. Class 106 (4). [Also in Groups XI and XVIII] A dial or panel lighting arrangement for indicating-apparatus comprises a sheet of lightconducting transparent material covering an area which is to be viewed, a portion of the sheet which may extend beyond this area being contoured by an edge of parabolic shape with a' source of light at the focal point of the parabolic edge. The dial 1 of an electric clock may be edge-lit from an electric lamp 3 in series with a few turns of wire coupled to the clock motor transformer and with a carbon pressure type resistor with adjusting.knob 5 for controlling the intensity of illumination. The lamp 3 is located at the focal point of two inclined parabolically shaped edges of an extension of the dial 1 of glass or a suitable plastic material and a reflecting edge coating 18a may be provided. The lamp 3 is shielded at the front by a cap 21 and is also shielded by a member 22 so that light may pass from the lamp only into the dial 1. Numerals and the dial pattern are indented on the rear surface 2 of the dial and increase in depth as their distance from the lamp increases to keep their illumination uniform. Alternatively the dial may taper in thickness. The dial cup 24, 25 aids in reflecting light back into the dial. The two parabolic surfaces prevent shadows from a central. stack, otherwise a single parabolic surface will suffice. A. similar arrangement may be used to illuminate a number of instruments mounted on a panel either from. a single source or from separate sources for each instrument.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US764464XA | 1954-01-27 | 1954-01-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB764464A true GB764464A (en) | 1956-12-28 |
Family
ID=22132065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2521/55A Expired GB764464A (en) | 1954-01-27 | 1955-01-27 | Improvements in and relating to dial or panel lighting |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB764464A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2447936A (en) * | 2007-03-28 | 2008-10-01 | Visteon Global Tech Inc | Instrument illumination system |
-
1955
- 1955-01-27 GB GB2521/55A patent/GB764464A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2447936A (en) * | 2007-03-28 | 2008-10-01 | Visteon Global Tech Inc | Instrument illumination system |
| GB2447936B (en) * | 2007-03-28 | 2011-09-07 | Visteon Global Tech Inc | Illumination system |
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