JPS57177115A - Projection lens device - Google Patents

Projection lens device

Info

Publication number
JPS57177115A
JPS57177115A JP6206981A JP6206981A JPS57177115A JP S57177115 A JPS57177115 A JP S57177115A JP 6206981 A JP6206981 A JP 6206981A JP 6206981 A JP6206981 A JP 6206981A JP S57177115 A JPS57177115 A JP S57177115A
Authority
JP
Japan
Prior art keywords
lens
positive
space
projection lens
lens device
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.)
Granted
Application number
JP6206981A
Other languages
Japanese (ja)
Other versions
JPH0151809B2 (en
Inventor
Jihei Nakagawa
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP6206981A priority Critical patent/JPS57177115A/en
Publication of JPS57177115A publication Critical patent/JPS57177115A/en
Publication of JPH0151809B2 publication Critical patent/JPH0151809B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/02—Viewfinders
    • G03B13/16—Viewfinders combined with focusing aids
    • 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 a wide angle lens and to lengthen a back-focus, by providing the first lens consisting of a positive lens, the second lens consisting of a positive lens and the third lens consisting of a negative lens, on the same optical axis, and reducing a space between the second lens and the third lens. CONSTITUTION:The first lens P1 consisting of a positive lens, the second lens P2 consisting of a biconcave positive lens and the third lens P3 consisting of a negative lens are provided in said order on the same optical axis. In case of this invention, a space L2 between the second lens P2 and the third lens P3 is set so as to satisfy 0.6f>L2>0.3f. (Provided that (f) denotes a focal distance of the whole lens system). In this way, a wide angle lens is obtained and a back-focus is lengthened by reducing the space between the second lens P2 and the third lens P3.
JP6206981A 1981-04-23 1981-04-23 Projection lens device Granted JPS57177115A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6206981A JPS57177115A (en) 1981-04-23 1981-04-23 Projection lens device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6206981A JPS57177115A (en) 1981-04-23 1981-04-23 Projection lens device

Publications (2)

Publication Number Publication Date
JPS57177115A true JPS57177115A (en) 1982-10-30
JPH0151809B2 JPH0151809B2 (en) 1989-11-06

Family

ID=13189430

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6206981A Granted JPS57177115A (en) 1981-04-23 1981-04-23 Projection lens device

Country Status (1)

Country Link
JP (1) JPS57177115A (en)

Cited By (14)

* 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
JPS59133517A (en) * 1983-01-21 1984-07-31 Nippon Kogaku Kk <Nikon> Projection lens
JPS6073514A (en) * 1983-09-30 1985-04-25 Hitachi Ltd Lens for projection television
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
JPS61189513A (en) * 1985-02-18 1986-08-23 エヌ・ベー・フイリツプス・フルーイランペンフアブリケン Projection lens system
US4682862A (en) * 1986-01-17 1987-07-28 U.S. Precision Lens Incorporated Projection lens
US4685774A (en) * 1986-01-17 1987-08-11 U.S. Precision Lens, Incorporated Projection lens
US4697892A (en) * 1983-10-18 1987-10-06 U.S. Precision Lens, Inc. Projection lens
US4755028A (en) * 1986-10-14 1988-07-05 U.S Precision Lens, Incorporated Projection lens with an aspherical corrector lens element
US4776681A (en) * 1986-01-17 1988-10-11 U.S. Precision Lens, Incorporated Projection lens
US4801196A (en) * 1984-08-21 1989-01-31 U.S. Precision Lens, Incorporated Wide angle projection lens
US4815831A (en) * 1985-07-11 1989-03-28 U.S. Precision Lens, Incorporated Projection lens with color correction

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5087322A (en) * 1973-12-05 1975-07-14
JPS50145226A (en) * 1974-05-14 1975-11-21
JPS50145227A (en) * 1974-05-14 1975-11-21
JPS55124114A (en) * 1978-09-08 1980-09-25 Us Precision Lens Inc Projector lens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5087322A (en) * 1973-12-05 1975-07-14
JPS50145226A (en) * 1974-05-14 1975-11-21
JPS50145227A (en) * 1974-05-14 1975-11-21
JPS55124114A (en) * 1978-09-08 1980-09-25 Us Precision Lens Inc Projector lens

Cited By (17)

* 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
JPS59133517A (en) * 1983-01-21 1984-07-31 Nippon Kogaku Kk <Nikon> Projection lens
JPH0423764B2 (en) * 1983-01-21 1992-04-23 Nippon Kogaku Kk
JPS6073514A (en) * 1983-09-30 1985-04-25 Hitachi Ltd Lens for projection television
JPH0578010B2 (en) * 1983-09-30 1993-10-27 Hitachi Ltd
US4697892A (en) * 1983-10-18 1987-10-06 U.S. Precision Lens, Inc. Projection lens
US4801196A (en) * 1984-08-21 1989-01-31 U.S. Precision Lens, Incorporated Wide angle 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
JPS61189513A (en) * 1985-02-18 1986-08-23 エヌ・ベー・フイリツプス・フルーイランペンフアブリケン Projection lens system
US4815831A (en) * 1985-07-11 1989-03-28 U.S. Precision Lens, Incorporated Projection lens with color correction
US4682862A (en) * 1986-01-17 1987-07-28 U.S. Precision Lens Incorporated Projection lens
US4776681A (en) * 1986-01-17 1988-10-11 U.S. Precision Lens, Incorporated Projection lens
US4685774A (en) * 1986-01-17 1987-08-11 U.S. Precision Lens, Incorporated Projection lens
US4755028A (en) * 1986-10-14 1988-07-05 U.S Precision Lens, Incorporated Projection lens with an aspherical corrector lens element

Also Published As

Publication number Publication date
JPH0151809B2 (en) 1989-11-06

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