US3186299A - Device to increase the resolving power in projections on a translucent screen, particularly fit for photogrammetric appliances - Google Patents

Device to increase the resolving power in projections on a translucent screen, particularly fit for photogrammetric appliances Download PDF

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Publication number
US3186299A
US3186299A US181247A US18124762A US3186299A US 3186299 A US3186299 A US 3186299A US 181247 A US181247 A US 181247A US 18124762 A US18124762 A US 18124762A US 3186299 A US3186299 A US 3186299A
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US
United States
Prior art keywords
screen
photogrammetric
projections
appliances
increase
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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
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US181247A
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English (en)
Inventor
Parenti Gino
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.)
OTTICO MECCANICA INTALIANA SOC
Ottico Meccanica Intaliana Socpaz
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OTTICO MECCANICA INTALIANA SOC
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    • 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
    • G03B21/54—Accessories
    • G03B21/56—Projection screens

Definitions

  • the purpose of this invention is to ensure a good definition of the projected images, also to maintain a considerable uniformity of the distribution of the intensity of the illumination of the screen.
  • the description of the invention may more easily be followed in reference to the added illustrating design which represents, by way of a not limited example, a preferred performance. In the illustration:
  • FIG. 1 represents a screen mounted on a frame
  • FIG. 2 is a section of the same according to the hatched plan IIII of FIG. 1.
  • a screen is represented with such roughness as to ensure a uniform distribution of the luminosity of the image.
  • Said screen is mounted on frame 2 on the lower end of which are made two holes 3, while at the upper end two pivots 4 are fitted free to turn in their proper seats.
  • pivots 13 are fixed in the holes 3 and made con- 3,186,299 Patented June 1, 1965 joint with plate 5.
  • the arrangement of pivots 13 and the size of the holes 3, taking into account the eccentricity of pivots 4 with respect to the helicoidal wheels 11, are such as to allow the frame 2 and therefore the formation plan of the projected image, a uniform circular movement of which the trajectory, by virtue of the flanges of pivots 13, constantly will be on the layer located by the above-mentioned collection plan of the projected image.
  • a cover 14 whilst it protects the mechanical parts in movement, prevents the observer from seeing this, so that the projected image on screen 1 appears to him clear and perfectly defined.
  • the effect of the roughness of the translucent screen will be of less influence to the clearness of the image and therefore the image will turn out to admit the relief also in the smallest details.
  • the considerable grade of roughness which it was possible to adopt for the translucent surface of the screen will permit to observe the projected image, endowed by luminous intensity almost uniform from the centre to the margins of the drawing.
  • An optical device comprising a single translucent screen having a rough surface and adapted to receive a projected image, a frame carrying said screen and having two upper corner portions and two lower corner portions, two symmetrically disposed pivots mounted in said upper corner portions, a supporting plate, a motor carried by said plate, an elongated shaft driven by said motor, two endless screws keyed upon said shaft, two helicoidal wheels meshing with said screws, each of said pivots being eccentrically mounted in a separate helicoidal wheel and being rotatable therewith, said two lower corner pontions having circular symmetrically disposed uniform holes, and two pivots mounted in said plate, the two last-mentioned pivots engaging the side walls of said holes and having diameters which are smaller than those of said holes.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Eye Examination Apparatus (AREA)
US181247A 1961-03-22 1962-03-21 Device to increase the resolving power in projections on a translucent screen, particularly fit for photogrammetric appliances Expired - Lifetime US3186299A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT501861 1961-03-22

Publications (1)

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US3186299A true US3186299A (en) 1965-06-01

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US181247A Expired - Lifetime US3186299A (en) 1961-03-22 1962-03-21 Device to increase the resolving power in projections on a translucent screen, particularly fit for photogrammetric appliances

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US (1) US3186299A (it)
CH (1) CH381886A (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3473862A (en) * 1967-03-06 1969-10-21 Singer General Precision Optical screen orbital movement system
US3610728A (en) * 1969-04-07 1971-10-05 Eastman Kodak Co Screen orbiting mechanism
US4317618A (en) * 1979-05-02 1982-03-02 Fuji Photo Film Co., Ltd. Vibrating screen for image projection

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1969909A (en) * 1931-08-19 1934-08-14 Luther G Simjian Motion picture moving screen
US2525596A (en) * 1949-01-21 1950-10-10 Jones & Lamson Mach Co Optical projection screen
US2780136A (en) * 1952-03-10 1957-02-05 Richard T Erban Kinoptic devices

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1969909A (en) * 1931-08-19 1934-08-14 Luther G Simjian Motion picture moving screen
US2525596A (en) * 1949-01-21 1950-10-10 Jones & Lamson Mach Co Optical projection screen
US2780136A (en) * 1952-03-10 1957-02-05 Richard T Erban Kinoptic devices

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3473862A (en) * 1967-03-06 1969-10-21 Singer General Precision Optical screen orbital movement system
US3610728A (en) * 1969-04-07 1971-10-05 Eastman Kodak Co Screen orbiting mechanism
US4317618A (en) * 1979-05-02 1982-03-02 Fuji Photo Film Co., Ltd. Vibrating screen for image projection

Also Published As

Publication number Publication date
CH381886A (it) 1964-09-15

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