GB672661A - Image projection optical system - Google Patents

Image projection optical system

Info

Publication number
GB672661A
GB672661A GB16789/46A GB1678946A GB672661A GB 672661 A GB672661 A GB 672661A GB 16789/46 A GB16789/46 A GB 16789/46A GB 1678946 A GB1678946 A GB 1678946A GB 672661 A GB672661 A GB 672661A
Authority
GB
United Kingdom
Prior art keywords
image
screen
mirror
projection
disposed
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
GB16789/46A
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.)
PHILCO PRODUCTS Inc
Original Assignee
PHILCO PRODUCTS Inc
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 PHILCO PRODUCTS Inc filed Critical PHILCO PRODUCTS Inc
Publication of GB672661A publication Critical patent/GB672661A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

672,661. Optical projection apparatus. PHILCO PRODUCTS, Inc. June 3, 1946 [June 16, 1945], No. 16789/46. Class 97 (i). The apparatus comprises an image-producing device (e.g. a cathode-ray tube) disposed in the path of projection and causing masking of the aperture of the projection apparatus, means including a cylindrical element for reproducing the image, said element tending to accentuate variations in overall brightness of the image, as viewed from different positions in a viewing plane, caused by variation of aperture area in the direction of the axis of the element and stop means disposed in the path of projection and comprising non-transmissive elements shaped and dimensioned, according to the aforesaid masking, to render the width of the aperture substantially constant in the direction of the axis of the cylindrical element, whereby substantially to eliminate said variations. In one form, the apparatus comprises a cathode-ray tube T, the image on the face t of which is directed by a spherical mirror M through a plate C correcting for the spherical aberrations of mirror M on to a cylindrical screen S, disposed with its axis horizontal, which screen may be of the type disclosed in Specification 6077/48 (as open to inspection under Sect. 91). Between the mirror M and the screen S is located the stop, which comprises opaque members S<SP>1</SP> and S<SP>2</SP> that may be painted on the correcting plate C.
GB16789/46A 1945-06-16 1946-06-03 Image projection optical system Expired GB672661A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US672661XA 1945-06-16 1945-06-16

Publications (1)

Publication Number Publication Date
GB672661A true GB672661A (en) 1952-05-28

Family

ID=22074847

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16789/46A Expired GB672661A (en) 1945-06-16 1946-06-03 Image projection optical system

Country Status (1)

Country Link
GB (1) GB672661A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165960A (en) * 1984-10-22 1986-04-23 Gen Electric Light collection systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165960A (en) * 1984-10-22 1986-04-23 Gen Electric Light collection systems

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