US2119542A - Prism - Google Patents

Prism Download PDF

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Publication number
US2119542A
US2119542A US132353A US13235337A US2119542A US 2119542 A US2119542 A US 2119542A US 132353 A US132353 A US 132353A US 13235337 A US13235337 A US 13235337A US 2119542 A US2119542 A US 2119542A
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United States
Prior art keywords
face
prism
angle
rays
reflecting
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Expired - Lifetime
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US132353A
Inventor
Otto K Kaspereit
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Individual
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Individual
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Priority to US132353A priority Critical patent/US2119542A/en
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Publication of US2119542A publication Critical patent/US2119542A/en
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Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms

Definitions

  • This invention relates to a prism.
  • the purpose of the invention is to provide a one-piece prism designed to deviate the line of sight through an angle of 90 in the horizontal plane and through an angle of 45 in the vertical plane and to invert and revert the image.
  • FIG. 1 is a plan view
  • Fig. 2 is a view in rear elevation
  • Fig. 3 is a view in end elevation.
  • angles of alpha are equal to 67 30 and the angle beta is equal to 45.
  • the prism consists of a single block having parallel front and rear faces respectively 5 and 6. Only a portion of the front face 5 is employed as an entrant face 5 and opposite this portion is a reflecting face 1 making an angle of 45 therewith.
  • the left end portion of the prism therefore constitutes a right-angle reflecting prism whose bottom face 8 is disposed horizontally.
  • the prism has an inclined reflecting face 9 disposed in the path of the rays reflected by the face I and at an angle of 67 30' to the vertical line of the prism as indicated by the angle alpha in Fig. 2.
  • the right end of the prism forms an emergent face I at an angle of 67 30' to the reflecting face 9 and perpendicular to the path of the rays reflected by the face 9.
  • the upper face ll of the prism is a plane continuous surface.
  • the rays of light entering the prism at the face are deviated by the reflecting face 1 through an angle of 90 in the horizontal plane and are directed onto the face 9 which deviates them through an angle of 45 in the vertical plane.
  • An inspection of the horizontal rays a, b, c, and the vertical rays 0., b, e, shows that the image will appear inverted and reverted in the emergent face I0.

Description

JbUl bll HUUIH June 7, 1938. 0. K. KASPEREIT PRISM Filed March 22, 1937 Fig-5- mm m PM r V5. D nanfl u K Patented June 7, 1938 UNITED STATES QCZNL'H TKUUHi PATENT OFFICE 1 Claim.
(Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.
This invention relates to a prism.
The purpose of the invention is to provide a one-piece prism designed to deviate the line of sight through an angle of 90 in the horizontal plane and through an angle of 45 in the vertical plane and to invert and revert the image.
A practical embodiment of the invention is illustrated in the accompanying drawing, in which Fig. 1 is a plan view,
Fig. 2 is a view in rear elevation,
Fig. 3 is a view in end elevation.
Referring to the drawing by characters of reference, the angles of alpha are equal to 67 30 and the angle beta is equal to 45.
The prism consists of a single block having parallel front and rear faces respectively 5 and 6. Only a portion of the front face 5 is employed as an entrant face 5 and opposite this portion is a reflecting face 1 making an angle of 45 therewith. The left end portion of the prism therefore constitutes a right-angle reflecting prism whose bottom face 8 is disposed horizontally. The prism has an inclined reflecting face 9 disposed in the path of the rays reflected by the face I and at an angle of 67 30' to the vertical line of the prism as indicated by the angle alpha in Fig. 2. The right end of the prism forms an emergent face I at an angle of 67 30' to the reflecting face 9 and perpendicular to the path of the rays reflected by the face 9. The upper face ll of the prism is a plane continuous surface.
The rays of light entering the prism at the face are deviated by the reflecting face 1 through an angle of 90 in the horizontal plane and are directed onto the face 9 which deviates them through an angle of 45 in the vertical plane. An inspection of the horizontal rays a, b, c, and the vertical rays 0., b, e, shows that the image will appear inverted and reverted in the emergent face I0.
I claim:
A single prism for inverting and reverting an image embodying an entrant face for rays of light, a first reflecting face disposed at an angle of 45 to the entrant face for deviating the rays of light through 90, a second reflecting face making an angle of 67 30 with a plane perpendicular to the path of the rays deviated by the first reflecting face and receiving the rays of light from the first reflecting face and deviating them through an angle of 45 to the plane perpendicular to the path of the reflected rays and an emergent face making an angle of 67 30' with the second reflecting face.
OTTO K. KASPEREIT.
US132353A 1937-03-22 1937-03-22 Prism Expired - Lifetime US2119542A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US132353A US2119542A (en) 1937-03-22 1937-03-22 Prism

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Application Number Priority Date Filing Date Title
US132353A US2119542A (en) 1937-03-22 1937-03-22 Prism

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US2119542A true US2119542A (en) 1938-06-07

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2841048A (en) * 1954-04-29 1958-07-01 Du Pont Yarn defect monitor
US2909845A (en) * 1956-08-20 1959-10-27 Keith L Mikesell Compass
US3044344A (en) * 1960-04-15 1962-07-17 Joel T Hartmeister Range finding device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2841048A (en) * 1954-04-29 1958-07-01 Du Pont Yarn defect monitor
US2909845A (en) * 1956-08-20 1959-10-27 Keith L Mikesell Compass
US3044344A (en) * 1960-04-15 1962-07-17 Joel T Hartmeister Range finding device

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