GB664193A - Photographic dark-room lamp - Google Patents
Photographic dark-room lampInfo
- Publication number
- GB664193A GB664193A GB528049A GB528049A GB664193A GB 664193 A GB664193 A GB 664193A GB 528049 A GB528049 A GB 528049A GB 528049 A GB528049 A GB 528049A GB 664193 A GB664193 A GB 664193A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sheet
- bulb
- glass
- dark
- side
- 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
- G02B6/0001—Light guides specially adapted for lighting devices or systems
- G02B6/0011—Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0091—Positioning aspects of the light source relative to the light guide
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
- G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
- G03D17/00—Dark-room arrangements not provided for in the preceding groups; Portable dark-rooms
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
- G02B6/00—Light guides
- G02B6/0001—Light guides specially adapted for lighting devices or systems
- G02B6/0011—Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
- G02B6/00—Light guides
- G02B6/0001—Light guides specially adapted for lighting devices or systems
- G02B6/0011—Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
- G02B6/00—Light guides
- G02B6/0001—Light guides specially adapted for lighting devices or systems
- G02B6/0011—Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/007—Incandescent lamp or gas discharge lamp
- G02B6/0071—Incandescent lamp or gas discharge lamp with elongated shape, e.g. tube
Abstract
664,193. Dark-room lamps. ILFORD, Ltd. Feb. 23, 1950 [Feb. 26, 1949], No. 5280/49. Class 75(iv) A photographic dark-room lamp comprises a sheet or block of glass or transparent synthetic plastic material 5 mounted to present an edge or end surface to an electric bulb 2 so that light enters the glass therethrough and emerges from a side surface, a filter 4 being included so that the light emerging is light to which photographic materials are insensitive. The sheet is held between flanges 6 on the elongated tubular metal housing 1. The emitting side of the sheet is matted or scored with lines 7, the intensity of the matting or the frequency and depth of the lines increasing with the distance from the bulb; the other side of the sheet is polished. The filter may be on the outer surface of the sheet or within the substance of the sheet. The glass sheet may be curved; it may be mounted vertically above a base containing a bulb; it may comprise a flat disc with a central opening for the bulb.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB528049A GB664193A (en) | 1949-02-26 | 1949-02-26 | Photographic dark-room lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB528049A GB664193A (en) | 1949-02-26 | 1949-02-26 | Photographic dark-room lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
GB664193A true GB664193A (en) | 1952-01-02 |
Family
ID=9793135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB528049A Expired GB664193A (en) | 1949-02-26 | 1949-02-26 | Photographic dark-room lamp |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB664193A (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3023304A (en) * | 1958-08-07 | 1962-02-27 | Sinclair Oil & Gas Company | Shadow box |
US3043947A (en) * | 1960-04-08 | 1962-07-10 | Gen Electric | Light distributing lens system |
US3132810A (en) * | 1961-04-17 | 1964-05-12 | Scm Corp | Photographic illumination device |
US3183295A (en) * | 1962-06-11 | 1965-05-11 | Acf Ind Inc | Light pipe |
US3328570A (en) * | 1965-04-09 | 1967-06-27 | Gen Electric | Illuminated panel member |
FR2317719A1 (en) * | 1975-07-10 | 1977-02-04 | Voltam Sa | Inscription display panel visible by day or night - uses transparent plaque with bevelled edge in which light is totally internally reflected |
US4274127A (en) * | 1976-06-09 | 1981-06-16 | Beck Blaine E | Vehicle safety illumination device |
FR2620795A1 (en) * | 1987-09-18 | 1989-03-24 | Courageux Claude | Light Diffuser |
US5055978A (en) * | 1989-12-29 | 1991-10-08 | Gte Products Corporation | Uniform light source |
US5101325A (en) * | 1990-03-20 | 1992-03-31 | General Electric Company | Uniform illumination of large, thin surfaces particularly suited for automotive applications |
US5130898A (en) * | 1989-05-18 | 1992-07-14 | Seiko Epson Corporation | Background lighting apparatus for liquid crystal display |
US5134549A (en) * | 1990-06-19 | 1992-07-28 | Enplas Corporation | Surface light source device |
FR2674611A1 (en) * | 1991-03-30 | 1992-10-02 | Triumph Adler Ag | An illumination of displays, including computer equipment. |
US5359155A (en) * | 1993-03-25 | 1994-10-25 | Tiger Scientific Corp. | Illumination apparatus for a digitizer tablet |
US5461547A (en) * | 1993-07-20 | 1995-10-24 | Precision Lamp, Inc. | Flat panel display lighting system |
US5667289A (en) * | 1989-05-18 | 1997-09-16 | Seiko Epson Corporation | Background lighting apparatus for liquid crystal display |
US5949505A (en) * | 1992-07-13 | 1999-09-07 | Seiko Epson Corporation | Surface-type illumination device and liquid crystal display |
US6578976B2 (en) | 2000-08-18 | 2003-06-17 | Klaus Bothe | Lighting device |
-
1949
- 1949-02-26 GB GB528049A patent/GB664193A/en not_active Expired
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3023304A (en) * | 1958-08-07 | 1962-02-27 | Sinclair Oil & Gas Company | Shadow box |
US3043947A (en) * | 1960-04-08 | 1962-07-10 | Gen Electric | Light distributing lens system |
US3132810A (en) * | 1961-04-17 | 1964-05-12 | Scm Corp | Photographic illumination device |
US3183295A (en) * | 1962-06-11 | 1965-05-11 | Acf Ind Inc | Light pipe |
US3328570A (en) * | 1965-04-09 | 1967-06-27 | Gen Electric | Illuminated panel member |
FR2317719A1 (en) * | 1975-07-10 | 1977-02-04 | Voltam Sa | Inscription display panel visible by day or night - uses transparent plaque with bevelled edge in which light is totally internally reflected |
US4274127A (en) * | 1976-06-09 | 1981-06-16 | Beck Blaine E | Vehicle safety illumination device |
FR2620795A1 (en) * | 1987-09-18 | 1989-03-24 | Courageux Claude | Light Diffuser |
WO1990010823A1 (en) * | 1987-09-18 | 1990-09-20 | Claude Courageux | Light diffuser |
US5667289A (en) * | 1989-05-18 | 1997-09-16 | Seiko Epson Corporation | Background lighting apparatus for liquid crystal display |
US5130898A (en) * | 1989-05-18 | 1992-07-14 | Seiko Epson Corporation | Background lighting apparatus for liquid crystal display |
US5931555A (en) * | 1989-05-18 | 1999-08-03 | Seiko Epson Corporation | Background lighting apparatus for liquid crystal display |
US5055978A (en) * | 1989-12-29 | 1991-10-08 | Gte Products Corporation | Uniform light source |
US5101325A (en) * | 1990-03-20 | 1992-03-31 | General Electric Company | Uniform illumination of large, thin surfaces particularly suited for automotive applications |
US5134549A (en) * | 1990-06-19 | 1992-07-28 | Enplas Corporation | Surface light source device |
FR2674611A1 (en) * | 1991-03-30 | 1992-10-02 | Triumph Adler Ag | An illumination of displays, including computer equipment. |
US5949505A (en) * | 1992-07-13 | 1999-09-07 | Seiko Epson Corporation | Surface-type illumination device and liquid crystal display |
US6108060A (en) * | 1992-07-13 | 2000-08-22 | Seiko Epson Corporation | Surface-type illumination device and liquid crystal display |
US5359155A (en) * | 1993-03-25 | 1994-10-25 | Tiger Scientific Corp. | Illumination apparatus for a digitizer tablet |
US5461547A (en) * | 1993-07-20 | 1995-10-24 | Precision Lamp, Inc. | Flat panel display lighting system |
US6578976B2 (en) | 2000-08-18 | 2003-06-17 | Klaus Bothe | Lighting device |
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