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JPS56125716A - Projection lens for three primary color projection type large-size television - Google Patents

Projection lens for three primary color projection type large-size television

Info

Publication number
JPS56125716A
JPS56125716A JP2954580A JP2954580A JPS56125716A JP S56125716 A JPS56125716 A JP S56125716A JP 2954580 A JP2954580 A JP 2954580A JP 2954580 A JP2954580 A JP 2954580A JP S56125716 A JPS56125716 A JP S56125716A
Authority
JP
Japan
Prior art keywords
lens
convex
aspherical
primary color
plastic
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.)
Pending
Application number
JP2954580A
Other languages
Japanese (ja)
Inventor
Yoshihiro Ishida
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.)
Ishida Scales Manufacturing Co Ltd
Ishida Co Ltd
Original Assignee
Ishida Scales Manufacturing Co Ltd
Ishida Co 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 Ishida Scales Manufacturing Co Ltd, Ishida Co Ltd filed Critical Ishida Scales Manufacturing Co Ltd
Priority to JP2954580A priority Critical patent/JPS56125716A/en
Publication of JPS56125716A publication Critical patent/JPS56125716A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To obtain sufficient amount of light, by providing aspherical concave lens, convex lens made of plastic and convex lens made of glass in the order from a cathode-ray tube integrally with the 2nd and 3rd lenses and providing adjustably to the 1st lens. CONSTITUTION:In the order from the cathode-ray tube 1, the aspherical concave lens 3 made of plastic, plastic lens 4 having aspherical convex at the 1st lens side and sperical convex at another side, and convex lens 5 made of glass, are provided. The 1st lens is fixed to the external barrel 6, the 2nd lens 4 and the 3rd lens 5 are fixed to the inner barrel 7, and it can be adjusted to the 1st lens integrally. Since the 1st lens 3 is aspherical and the aperture can be increased, uniform the sufficient light can be given to the entire screen.
JP2954580A 1980-03-08 1980-03-08 Projection lens for three primary color projection type large-size television Pending JPS56125716A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2954580A JPS56125716A (en) 1980-03-08 1980-03-08 Projection lens for three primary color projection type large-size television

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2954580A JPS56125716A (en) 1980-03-08 1980-03-08 Projection lens for three primary color projection type large-size television

Publications (1)

Publication Number Publication Date
JPS56125716A true JPS56125716A (en) 1981-10-02

Family

ID=12279089

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2954580A Pending JPS56125716A (en) 1980-03-08 1980-03-08 Projection lens for three primary color projection type large-size television

Country Status (1)

Country Link
JP (1) JPS56125716A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58125007A (en) * 1982-01-20 1983-07-25 Matsushita Electric Ind Co Ltd Projection lens
JPS6180119A (en) * 1984-09-27 1986-04-23 Matsushita Electric Ind Co Ltd Projecting optical device
JPS61147213A (en) * 1984-12-20 1986-07-04 Matsushita Electric Ind Co Ltd Compact projection lens
JPS61180214A (en) * 1985-02-06 1986-08-12 Matsushita Electric Ind Co Ltd Compact projection lens
JPH11149041A (en) * 1997-09-10 1999-06-02 Hitachi Ltd Projecting lens device and projection type picture display device using the device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58125007A (en) * 1982-01-20 1983-07-25 Matsushita Electric Ind Co Ltd Projection lens
JPS6218894B2 (en) * 1982-01-20 1987-04-24 Matsushita Electric Ind Co Ltd
JPS6180119A (en) * 1984-09-27 1986-04-23 Matsushita Electric Ind Co Ltd Projecting optical device
JPS61147213A (en) * 1984-12-20 1986-07-04 Matsushita Electric Ind Co Ltd Compact projection lens
JPS61180214A (en) * 1985-02-06 1986-08-12 Matsushita Electric Ind Co Ltd Compact projection lens
JPH11149041A (en) * 1997-09-10 1999-06-02 Hitachi Ltd Projecting lens device and projection type picture display device using the device

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