GB336288A - Improvements in or relating to arrangements for illuminating the dials of instruments - Google Patents
Improvements in or relating to arrangements for illuminating the dials of instrumentsInfo
- Publication number
- GB336288A GB336288A GB21388/29A GB2138829A GB336288A GB 336288 A GB336288 A GB 336288A GB 21388/29 A GB21388/29 A GB 21388/29A GB 2138829 A GB2138829 A GB 2138829A GB 336288 A GB336288 A GB 336288A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dial
- dials
- light
- rays
- instruments
- 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
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
-
- G—PHYSICS
- G12—INSTRUMENT DETAILS
- G12B—CONSTRUCTIONAL DETAILS OF INSTRUMENTS, OR COMPARABLE DETAILS OF OTHER APPARATUS, NOT OTHERWISE PROVIDED FOR
- G12B11/00—Indicating elements; Illumination thereof
- G12B11/02—Scales; Dials
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
- Details Of Measuring Devices (AREA)
Abstract
336,288. Pioneer Instrument Co., Inc., (Assignees of Urfer, A.). March 26, 1929, [Convention date]. Dials and scales, illuminating.-The dials of instruments are indirectly and uniformly illuminated by an externally disposed source of light and optical means comprising an optical body disposed in the casing and formed with a curved reflecting surface whereby the emitted rays are distributed by internal reflection uniformly over the dial area. As shown in Figs. 2 and 3, an instrument casing 13, carrying a dial 12 and cover glass 14, is mounted by means of a flange 17, 18 in a dashboard 11. The casing is drilled at 22 to receive a light distributing body 21 shaped as shown in Figs. 4 and 5 with a curved reflecting surface so as to permit rays from an external source of light such as a filament 19 to pass through and be reflected into a flat pencil of rays to illuminate the dial. To prevent shadows appearing at a remote part of the dial the optical body 21 is positioned so that the divergent rays strike the rear surface of the cover glass and are reflected therefrom on to the dial. A single source of light may be employed to illuminate the dials of a plurality of dashboard instruments symmetrically placed with respect thereto so as to receive the same degree of illumination.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US336288XA | 1929-03-26 | 1929-03-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB336288A true GB336288A (en) | 1930-10-13 |
Family
ID=21871493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21388/29A Expired GB336288A (en) | 1929-03-26 | 1929-07-11 | Improvements in or relating to arrangements for illuminating the dials of instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB336288A (en) |
-
1929
- 1929-07-11 GB GB21388/29A patent/GB336288A/en not_active Expired
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