US2770712A - Illuminated dial plate - Google Patents
Illuminated dial plate Download PDFInfo
- Publication number
- US2770712A US2770712A US265683A US26568352A US2770712A US 2770712 A US2770712 A US 2770712A US 265683 A US265683 A US 265683A US 26568352 A US26568352 A US 26568352A US 2770712 A US2770712 A US 2770712A
- Authority
- US
- United States
- Prior art keywords
- plate
- dial
- lamp
- dial plate
- piece
- 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 - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/18—Edge-illuminated signs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/50—Selection of substances for gas fillings; Specified pressure thereof
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/02—Indicating arrangements
- H03J1/04—Indicating arrangements with optical indicating means
- H03J1/044—Illumination of the tuning dial; On and off switching of the illumination; Circuits related with illumination
Definitions
- This invention relates to improvements in dials having a dial plate of transparent material which areparticularly useful in radio receivers.
- dial plates were always made of glass, there is an increasing use of dial plates of transparent plastic material, such, for example, as polymethacrylate.
- Plastic dial plates however, often give rise to difliculties due to the heat produced by the dial lamp, which may result in weakening and, after some time, dim-ness of the plastic material. Previously, this has been an o'bjection to the use of particular plastics having definite advantages, for example, polystyrene, the price of which is relatively low.
- the invention has for its object to obviate these difiiculties, which are in general inherent with the use of dial plates of a material having little resistance to heat. This is eifected by providing a connecting piece between the incandescent lamp and the dial plate, this piece being made of a transparent material which has greater resistance to heat than the material of the dial plate.
- Figure 1 shows the front view of a radio receiver according to the invent-ion.
- Figure 2 is a perspective view of the invention from the rear side of the dial.
- Figure 3 shows in section another embodiment of the invent-ion.
- the receiver shown in Fig. 1 comprises a front wall which comprises, as usual, a frame 1 having a board provided behind the aperture, in which an aperture 3 for the loudspeaker is provided and covered by a cloth.
- a dial plate 15 in suitable grooves of the frame 1, a pointer 7 being adapted to move behind this plate.
- the connecting piece 17 provision is made for a recess 9 and an illuminating lamp III, which is arranged in a manner such that its light falls laterally on the connecting piece 17 and emerges at the markings of the station dial, so that these marks are distinctly illuminated.
- dial plates of poorly heat-resistant material for example plastic
- dial plates of poorly heat-resistant material for example plastic
- plastics having a slightly greater heat resistance such for example, as polymethacrylate, but they are materially more costly than plastics having low weakening temperatures, such as for example, polystyrene.
- Fig. 2 illustrates, viewed from the rear side of the dial, howthe major part of the dial can be made of inexpensive plastic according to the invention.
- a trapezoidal connecting piece 17 of transparent sheet material is arranged between the vertical dial plate 15, made for example, of polystyrene, and the incandescent lamp 11, at right angles to the plate'1 5.
- the transparent sheet material in piece 17 has a higher weakening point than polystyrene and can be for example, polymethacrylate or glass.
- the incandescent lamp 11 is housed in a recess at the short parallel edge of the trapezoidal (horizontal) connecting piece 17 and the long parallel edge loosely engages the lower edge of the plate 15 or is secured thereto with the use of transparent adhesive.
- Rays emanating approximately horizontally from the lamp 11 are collected by the connecting plate 17 and propagated to the lower edge of the dial plate 15.
- the rays fall on the rear side in a horizontal direction into the plate 15; however, on the front side, at the lower edge, the plate 15 has a facet, i. e. a slanting surface 19, which is at an angle of approximately 45 to the rear side of the plate and which reflects the horizontal incident inside of the plate approximately in a vertical direction.
- the plate 15 is insulated from the heat produced by the incandescent lamp 11.
- the cooling of the incandescent lamp is particularly favorable, since a vertical flow of air can freely brush past the lamp.
- structural advantage is obtained by the present invention since the dial occupies little space and since the plate 17 extends primarily along the bottom of the cabinet.
- the trapezoidal intermediate piece ensures furthermore a uniform distribution of the light in the plate 15.
- the plate 17 can be made of two plates of this kind and may be arranged in line with the plate 15.
- the intermediate piece 17 may have a particular color or differently colored parts, so that a color effect may be obtained in a colorless dial plate.
- Fig. 3 shows, in an axial sectional view, a second embodiment of the intermediate piece 21, which is, in this case, primarily rod-shaped; one end thereof may be secured in a fitting circular aperture in the dial plate 23.
- the rod has a cup-shaped cavity 24, in which the incandescent lamp 11 is housed.
- the rod has a re-entrant profile 25 of such a shape that primarily axially incident light rays are projected into the plate 23 in radial directions.
- This construction is particularly suitable for dial plates, with which the incandescent lamp is arranged approximately opposite the center of the dial plate.
- a dial for use in radio receivers comprising an incandescent lamp, a transparent dial plate composed of a thermoplastic resin material which will be deformed or discolored when positioned adjacent to said lamp, said dial plate having a bottom marginal edge which slants angularly upwards, and a transparent connecting piece arranged between said lamp and said dial plate and angularly thereto, said piece being adapted to transmit light from said lamp to said dial plate through said bottom marginal edge and said piece being composed of a thermoplastic resin material exhibiting a value of resistance to heat at which said piece is not substantially deformed or discolored when adjacent said lamp.
- a dial for use in radio receivers comprising an incandescent lamp, a transparent dial plate composed of a thermoplastic resin material which will be deformed or discolored when positioned adjacent to said lamp, said dial plate having a bottom marginal edge which slants angularly upwards, and a transparent connecting piece in the form of a trapezoidal plate arranged between said lamp and said dial plate and angularly thereto, said piece being adapted to transmit light from said lamp to said dial plate through said bottom marginal edge, said piece being composed of a thermoplastic resin material ex hibiting a value of resistance to heat at which said piece is not substantially deformed or discolored when adjacent said lamp and having a recess in the shorter parallel edge in which is located said incandescent lamp, the longer parallel side of said connecting piece engaging said dial plate, and the air heated by said lamp being adapted to escape in a substantially vertical direction without contacting said connecting piece.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Details Of Measuring Devices (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL159216A NL82025C (fr) | 1951-02-12 | 1951-02-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2770712A true US2770712A (en) | 1956-11-13 |
Family
ID=41119335
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US265683A Expired - Lifetime US2770712A (en) | 1951-02-12 | 1952-01-09 | Illuminated dial plate |
Country Status (5)
Country | Link |
---|---|
US (1) | US2770712A (fr) |
DE (1) | DE944739C (fr) |
FR (1) | FR1050731A (fr) |
GB (1) | GB708203A (fr) |
NL (2) | NL82025C (fr) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2854509A (en) * | 1951-08-04 | 1958-09-30 | Alden Products Co | Facsimile optical scanning apparatus |
US2868960A (en) * | 1956-02-07 | 1959-01-13 | Arthur V Appel | Instrument dial illuminator |
DE1173267B (de) * | 1961-08-14 | 1964-07-02 | M K Juchheim Thermometerfabrik | Vorrichtung zum lichtelektrischen Betaetigen von Grenzwertkontakten und zum Beleuchten der Anzeigemittel bei Zeigereinbauinstrumenten |
US3148834A (en) * | 1961-11-22 | 1964-09-15 | Sperry Rand Corp | Illumination system |
US3248554A (en) * | 1961-12-13 | 1966-04-26 | Sperry Rand Corp | Uniform intensity illumination system |
US3761704A (en) * | 1972-01-06 | 1973-09-25 | Matusushita Electric Ind Co Lt | Dial illuminating device |
JPS5194684U (fr) * | 1975-01-27 | 1976-07-29 | ||
JPS5194683U (fr) * | 1975-01-27 | 1976-07-29 | ||
JPS51103651U (fr) * | 1975-02-18 | 1976-08-19 | ||
US4026635A (en) * | 1974-10-18 | 1977-05-31 | Ab Teleplan | Indicator for displaying text or symbols on small surfaces |
US4085436A (en) * | 1976-10-14 | 1978-04-18 | Allen Weiss | Ring light converter for electronic flash units |
US4447118A (en) * | 1981-09-21 | 1984-05-08 | The Boeing Company | Optical information transfer system |
US4564286A (en) * | 1983-06-09 | 1986-01-14 | Xerox Corporation | Illumination device |
US5255162A (en) * | 1991-05-07 | 1993-10-19 | Pioneer Electric Corporation | Lighting device for a grille of a car stereo |
US6932499B2 (en) * | 1995-03-22 | 2005-08-23 | Canon Kabushiki Kaisha | Light conductive member, illuminating device having the same, and information processing apparatus having the illuminating device |
US20060203463A1 (en) * | 2005-03-08 | 2006-09-14 | Sumitomo Wiring Systems, Ltd. | Light guiding body and lighting apparatus having the same |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1290996B (de) * | 1958-06-27 | 1969-03-20 | Siemens Ag | Beleuchtbare Anzeigevorrichtung fuer Geraete der elektrischen Nachrichtenuebertragungs- und Messtechnik |
GB1463061A (en) * | 1973-05-22 | 1977-02-02 | Lucas Electrical Ltd | Illuminable element |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1714242A (en) * | 1927-04-19 | 1929-05-21 | Paramount Famous Lasky Corp | Reflector arc |
US2071284A (en) * | 1935-10-23 | 1937-02-16 | Bendix Radio Corp | Indicating device |
US2150836A (en) * | 1937-02-27 | 1939-03-14 | Weston Electrical Instr Corp | Electrical measuring instrument |
US2413848A (en) * | 1944-02-02 | 1947-01-07 | Simpson Ray | Illuminated instrument |
GB595003A (en) * | 1944-02-02 | 1947-11-25 | Ray Simpson | Improvements in means for illuminating indicating instruments |
US2560117A (en) * | 1947-01-31 | 1951-07-10 | Robert W Mallary | Sign |
US2611018A (en) * | 1949-06-24 | 1952-09-16 | Westinghouse Brake & Signal | Mimic diagram panel |
-
0
- NL NL7309453.A patent/NL159216B/xx unknown
-
1951
- 1951-02-12 NL NL159216A patent/NL82025C/xx active
-
1952
- 1952-01-09 US US265683A patent/US2770712A/en not_active Expired - Lifetime
- 1952-02-08 GB GB3384/52A patent/GB708203A/en not_active Expired
- 1952-02-09 DE DEN5071A patent/DE944739C/de not_active Expired
- 1952-02-11 FR FR1050731D patent/FR1050731A/fr not_active Expired
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1714242A (en) * | 1927-04-19 | 1929-05-21 | Paramount Famous Lasky Corp | Reflector arc |
US2071284A (en) * | 1935-10-23 | 1937-02-16 | Bendix Radio Corp | Indicating device |
US2150836A (en) * | 1937-02-27 | 1939-03-14 | Weston Electrical Instr Corp | Electrical measuring instrument |
US2413848A (en) * | 1944-02-02 | 1947-01-07 | Simpson Ray | Illuminated instrument |
GB595003A (en) * | 1944-02-02 | 1947-11-25 | Ray Simpson | Improvements in means for illuminating indicating instruments |
US2560117A (en) * | 1947-01-31 | 1951-07-10 | Robert W Mallary | Sign |
US2611018A (en) * | 1949-06-24 | 1952-09-16 | Westinghouse Brake & Signal | Mimic diagram panel |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2854509A (en) * | 1951-08-04 | 1958-09-30 | Alden Products Co | Facsimile optical scanning apparatus |
US2868960A (en) * | 1956-02-07 | 1959-01-13 | Arthur V Appel | Instrument dial illuminator |
DE1173267B (de) * | 1961-08-14 | 1964-07-02 | M K Juchheim Thermometerfabrik | Vorrichtung zum lichtelektrischen Betaetigen von Grenzwertkontakten und zum Beleuchten der Anzeigemittel bei Zeigereinbauinstrumenten |
US3148834A (en) * | 1961-11-22 | 1964-09-15 | Sperry Rand Corp | Illumination system |
US3248554A (en) * | 1961-12-13 | 1966-04-26 | Sperry Rand Corp | Uniform intensity illumination system |
US3761704A (en) * | 1972-01-06 | 1973-09-25 | Matusushita Electric Ind Co Lt | Dial illuminating device |
US4026635A (en) * | 1974-10-18 | 1977-05-31 | Ab Teleplan | Indicator for displaying text or symbols on small surfaces |
JPS5754126Y2 (fr) * | 1975-01-27 | 1982-11-24 | ||
JPS5194683U (fr) * | 1975-01-27 | 1976-07-29 | ||
JPS5194684U (fr) * | 1975-01-27 | 1976-07-29 | ||
JPS51103651U (fr) * | 1975-02-18 | 1976-08-19 | ||
JPS555992Y2 (fr) * | 1975-02-18 | 1980-02-12 | ||
US4085436A (en) * | 1976-10-14 | 1978-04-18 | Allen Weiss | Ring light converter for electronic flash units |
US4447118A (en) * | 1981-09-21 | 1984-05-08 | The Boeing Company | Optical information transfer system |
US4564286A (en) * | 1983-06-09 | 1986-01-14 | Xerox Corporation | Illumination device |
US5255162A (en) * | 1991-05-07 | 1993-10-19 | Pioneer Electric Corporation | Lighting device for a grille of a car stereo |
US6932499B2 (en) * | 1995-03-22 | 2005-08-23 | Canon Kabushiki Kaisha | Light conductive member, illuminating device having the same, and information processing apparatus having the illuminating device |
US20060203463A1 (en) * | 2005-03-08 | 2006-09-14 | Sumitomo Wiring Systems, Ltd. | Light guiding body and lighting apparatus having the same |
US7566138B2 (en) * | 2005-03-08 | 2009-07-28 | Sumitomo Wiring Systems, Ltd. | Light guiding body and lighting apparatus having the same |
Also Published As
Publication number | Publication date |
---|---|
NL159216B (nl) | |
FR1050731A (fr) | 1954-01-11 |
DE944739C (de) | 1956-07-12 |
GB708203A (en) | 1954-04-28 |
NL82025C (fr) | 1956-07-16 |
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