NO121919B - - Google Patents

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Publication number
NO121919B
NO121919B NO159723A NO15972365A NO121919B NO 121919 B NO121919 B NO 121919B NO 159723 A NO159723 A NO 159723A NO 15972365 A NO15972365 A NO 15972365A NO 121919 B NO121919 B NO 121919B
Authority
NO
Norway
Prior art keywords
filter
band
crystal
crystals
filter according
Prior art date
Application number
NO159723A
Other languages
English (en)
Norwegian (no)
Inventor
R Appeldorn
Original Assignee
Minnesota Mining & Mfg
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
Application filed by Minnesota Mining & Mfg filed Critical Minnesota Mining & Mfg
Publication of NO121919B publication Critical patent/NO121919B/no

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/06—Projectors or projection-type viewers; Accessories therefor affording only episcopic projection
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S353/00—Optics: image projectors
    • Y10S353/04—Opaque

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
NO159723A 1964-09-28 1965-09-16 NO121919B (xx)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US399651A US3293982A (en) 1964-09-28 1964-09-28 Overhead projector with an unsymmetrical reflective supporting stage

Publications (1)

Publication Number Publication Date
NO121919B true NO121919B (xx) 1971-04-26

Family

ID=23580395

Family Applications (1)

Application Number Title Priority Date Filing Date
NO159723A NO121919B (xx) 1964-09-28 1965-09-16

Country Status (12)

Country Link
US (1) US3293982A (xx)
AT (1) AT279207B (xx)
BE (1) BE670154A (xx)
BR (1) BR6573548D0 (xx)
CH (1) CH457901A (xx)
DE (1) DE1472179C2 (xx)
DK (1) DK116398B (xx)
ES (1) ES317843A1 (xx)
GB (1) GB1122217A (xx)
NL (1) NL6512484A (xx)
NO (1) NO121919B (xx)
SE (1) SE311768B (xx)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459475A (en) * 1966-11-14 1969-08-05 James Wortz Lucas Overhead projector
US3525566A (en) * 1968-07-24 1970-08-25 Gerald Altman Projection devices and graphic materials therefor
JPS51933Y1 (xx) * 1969-06-17 1976-01-12
GB1273501A (en) * 1970-01-23 1972-05-10 Combined Optical Ind Ltd Improvements in and relating to mirrors
GB1297107A (xx) * 1970-01-23 1972-11-22
GB1300540A (en) * 1970-06-02 1972-12-20 Combined Optical Ind Ltd Vehicle rear-view mirrors
US3908056A (en) * 1973-09-10 1975-09-23 Minnesota Mining & Mfg Optically decorative web
DE2507515C2 (de) * 1975-02-21 1983-03-24 Demolux Gmbh & Co Kg, 6070 Langen Schreibprojektor
DE2747916C3 (de) * 1977-10-26 1980-12-11 Fa. Ed. Liesegang, 4000 Duesseldorf Schreibprojektor
US4492442A (en) * 1979-10-04 1985-01-08 Gaudyn Tad J Three dimensional projection arrangement
JPS5879731U (ja) * 1981-11-26 1983-05-30 ソニー株式会社 リアプロジエクタ装置
DE3233257A1 (de) * 1982-09-08 1984-03-08 Demolux Gmbh & Co Kg, 6070 Langen Overhead-projektor
DE3711542A1 (de) * 1987-04-06 1988-11-10 Demolux Overhead-projektor
US5255029A (en) * 1987-04-30 1993-10-19 Nview Corporation Liquid crystal display for projection systems
US5227821A (en) * 1987-04-30 1993-07-13 Nview Corporation Liquid crystal display for projection systems
US4775232A (en) * 1987-07-10 1988-10-04 Spectra, Inc. Catadioptric projection lantern
CA1327468C (en) * 1988-09-12 1994-03-08 Dennis F. Vanderwerf First surface fresnel reflector for liquid crystal display
US4943156A (en) * 1988-09-12 1990-07-24 Minnesota Mining And Manufacturing Company Off axis fresnel reflector for liquid crystal display
US4953971A (en) * 1988-10-17 1990-09-04 Highfill Robert R Interactive image projection apparatus
US4986651A (en) * 1989-08-04 1991-01-22 Minnesota Mining And Manufacturing Company Overhead projector with centerless Fresnel lens reflective stage
US5135301A (en) * 1991-01-22 1992-08-04 Minnesota Mining And Manufacturing Company Reflective overhead projector with alternate light sources
JPH0559448U (ja) * 1992-01-14 1993-08-06 松原電機工業株式会社 ディスプレイ装置
JP3655972B2 (ja) * 1996-08-16 2005-06-02 大日本印刷株式会社 反射型スクリーン及び前方投影システム
JP4675746B2 (ja) * 2005-10-26 2011-04-27 株式会社デンソー 計器用文字盤

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2407680A (en) * 1945-03-02 1946-09-17 Minnesota Mining & Mfg Reflex light reflector
US2588373A (en) * 1947-10-08 1952-03-11 Richard T Erban Kinoptic device
US2495320A (en) * 1948-03-27 1950-01-24 Holophane Co Inc Luminaire for surgical lighting
US2647437A (en) * 1949-05-17 1953-08-04 Instr Dev Lab Inc Picture unit for stereopticons
US2986062A (en) * 1956-09-25 1961-05-30 Toledo Scale Corp Weighing scale
US2914997A (en) * 1956-10-03 1959-12-01 Polaroid Corp Combined range and view finder for cameras
US3051041A (en) * 1959-05-25 1962-08-28 Xerox Corp Image projection
DE1153915B (de) * 1961-04-26 1963-09-05 Leitz Ernst Gmbh Schreibprojektor
US3203306A (en) * 1961-09-25 1965-08-31 Lefferts Peter Optical ray concentrator
USB322986I5 (xx) * 1963-01-04

Also Published As

Publication number Publication date
ES317843A1 (es) 1967-03-01
NL6512484A (xx) 1966-03-29
DE1472179C2 (de) 1975-09-18
DK116398B (da) 1970-01-05
CH457901A (de) 1968-06-15
AT279207B (de) 1970-02-25
SE311768B (xx) 1969-06-23
BE670154A (xx) 1966-03-28
DE1472179B1 (de) 1975-02-13
GB1122217A (en) 1968-07-31
BR6573548D0 (pt) 1973-09-11
US3293982A (en) 1966-12-27

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