US2234227A - Projection receiver - Google Patents

Projection receiver Download PDF

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Publication number
US2234227A
US2234227A US180018A US18001837A US2234227A US 2234227 A US2234227 A US 2234227A US 180018 A US180018 A US 180018A US 18001837 A US18001837 A US 18001837A US 2234227 A US2234227 A US 2234227A
Authority
US
United States
Prior art keywords
screen
image
oblique
projection
optical
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 - Lifetime
Application number
US180018A
Other languages
English (en)
Inventor
Below Fritz
Lindner Paul
Schwartz Erich
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.)
FIRM FERNSEH AG
Original Assignee
FIRM FERNSEH AG
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 FIRM FERNSEH AG filed Critical FIRM FERNSEH AG
Application granted granted Critical
Publication of US2234227A publication Critical patent/US2234227A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof

Definitions

  • the magnetic focusing field is periodically varied with a vertical or frame deflection by either sending a periodically undulating direct current through the focusing coil proper or by providing an auxiliary coil supplied with alternating current.
  • a corresponding variation of the focal length can be obtained by use of varying focusing voltages in the case of electrostatic focusing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US180018A 1936-12-16 1937-12-15 Projection receiver Expired - Lifetime US2234227A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE507582X 1936-12-16

Publications (1)

Publication Number Publication Date
US2234227A true US2234227A (en) 1941-03-11

Family

ID=6546798

Family Applications (1)

Application Number Title Priority Date Filing Date
US180018A Expired - Lifetime US2234227A (en) 1936-12-16 1937-12-15 Projection receiver

Country Status (4)

Country Link
US (1) US2234227A (de)
AT (1) AT157643B (de)
FR (1) FR830888A (de)
GB (1) GB507582A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2438022A (en) * 1945-03-22 1948-03-16 Rca Corp Projection device for television apparatus
US2466338A (en) * 1946-02-21 1949-04-05 Philco Corp Skewed schmidt television projector with directive screen
US2489835A (en) * 1945-11-14 1949-11-29 Philco Corp Optical projection system having apertured concave image forming mirror
US2508764A (en) * 1945-05-22 1950-05-23 William C Miller Optical projection system
US3023668A (en) * 1957-02-21 1962-03-06 Upjohn Co Portable slide projector
US4880300A (en) * 1988-05-06 1989-11-14 Payner Leonard E Vision saver for computer monitor
US5200859A (en) * 1988-05-06 1993-04-06 Ergonomic Eyecare Products, Inc. Vision saver for computer monitor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE914020C (de) * 1947-05-24 1954-06-24 Philips Nv Anordnung fuer Fernsehempfaenger des Projektionstyps
US3115544A (en) * 1956-04-25 1963-12-24 Hazeltine Research Inc Color-television receivers and deflection yokes
GB2185360B (en) * 1986-01-11 1989-10-25 Pilkington Perkin Elmer Ltd Display system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2438022A (en) * 1945-03-22 1948-03-16 Rca Corp Projection device for television apparatus
US2508764A (en) * 1945-05-22 1950-05-23 William C Miller Optical projection system
US2489835A (en) * 1945-11-14 1949-11-29 Philco Corp Optical projection system having apertured concave image forming mirror
US2466338A (en) * 1946-02-21 1949-04-05 Philco Corp Skewed schmidt television projector with directive screen
US3023668A (en) * 1957-02-21 1962-03-06 Upjohn Co Portable slide projector
US4880300A (en) * 1988-05-06 1989-11-14 Payner Leonard E Vision saver for computer monitor
US5200859A (en) * 1988-05-06 1993-04-06 Ergonomic Eyecare Products, Inc. Vision saver for computer monitor

Also Published As

Publication number Publication date
FR830888A (fr) 1938-08-11
AT157643B (de) 1939-12-27
GB507582A (en) 1939-06-16

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