GB664193A - Photographic dark-room lamp - Google Patents

Photographic dark-room lamp

Info

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
Grant status
Application
Patent type
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
Application number
GB528049A
Inventor
James Mitchell
Francis Albert Roads
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ilford Ltd
Original Assignee
Ilford Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081Mechanical 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
    • G02B6/0086Positioning aspects
    • G02B6/0091Positioning aspects of the light source relative to the light guide
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03DAPPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D17/00Dark-room arrangements not provided for in the preceding groups; Portable dark-rooms
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means 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
    • G02B6/0038Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0058Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061Means 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
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066Light 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
    • G02B6/007Incandescent lamp or gas discharge lamp
    • G02B6/0071Incandescent 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.
GB528049A 1949-02-26 1949-02-26 Photographic dark-room lamp Expired GB664193A (en)

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 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)

* Cited by examiner, † Cited by third party
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

Cited By (21)

* Cited by examiner, † Cited by third party
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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