IT961716B - Perfezionamento nei dispositivi ottici di ingrandimento - Google Patents

Perfezionamento nei dispositivi ottici di ingrandimento

Info

Publication number
IT961716B
IT961716B IT51787/72A IT5178772A IT961716B IT 961716 B IT961716 B IT 961716B IT 51787/72 A IT51787/72 A IT 51787/72A IT 5178772 A IT5178772 A IT 5178772A IT 961716 B IT961716 B IT 961716B
Authority
IT
Italy
Prior art keywords
improvement
optical magnification
magnification devices
devices
optical
Prior art date
Application number
IT51787/72A
Other languages
English (en)
Original Assignee
Opaque Systems 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
Application filed by Opaque Systems Ltd filed Critical Opaque Systems Ltd
Application granted granted Critical
Publication of IT961716B publication Critical patent/IT961716B/it

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
    • G03B21/10—Projectors with built-in or built-on screen
    • 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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Projection-Type Copiers In General (AREA)
IT51787/72A 1971-07-27 1972-07-26 Perfezionamento nei dispositivi ottici di ingrandimento IT961716B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00166512A US3817613A (en) 1971-07-27 1971-07-27 Optical enlarging device

Publications (1)

Publication Number Publication Date
IT961716B true IT961716B (it) 1973-12-10

Family

ID=22603627

Family Applications (1)

Application Number Title Priority Date Filing Date
IT51787/72A IT961716B (it) 1971-07-27 1972-07-26 Perfezionamento nei dispositivi ottici di ingrandimento

Country Status (5)

Country Link
US (1) US3817613A (it)
DE (1) DE2237020A1 (it)
FR (1) FR2147212A1 (it)
GB (1) GB1346038A (it)
IT (1) IT961716B (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IE49059B1 (en) * 1978-10-11 1985-07-24 Licinvest Ag Episcope
FR2463428A1 (fr) * 1979-05-16 1981-02-20 Prestinox Sa Perfectionnements aux visionneuses pour films cinematographiques
US4548485A (en) * 1983-09-01 1985-10-22 Stewart Dean Reading device for the visually handicapped

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA548933A (en) * 1957-11-19 T. Armbruster John Projection magnifiers
US2691916A (en) * 1950-08-03 1954-10-19 W K Kellogg Foundation Projector
US2720136A (en) * 1952-02-18 1955-10-11 W K Kellogg Foundation Projector
US3224321A (en) * 1963-04-24 1965-12-21 Beck Ludwig Heat exhaust suction device for opaque projectors
US3320854A (en) * 1965-05-04 1967-05-23 Opti Copy Inc Optical apparatus
US3642361A (en) * 1967-11-17 1972-02-15 Hellige & Co Gmbh F Illumination of projecting apparatus

Also Published As

Publication number Publication date
FR2147212A1 (it) 1973-03-09
DE2237020A1 (de) 1973-03-29
US3817613A (en) 1974-06-18
GB1346038A (en) 1974-02-06

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