SE7407134L - PROJECTION OPTICS - Google Patents

PROJECTION OPTICS

Info

Publication number
SE7407134L
SE7407134L SE7407134A SE7407134A SE7407134L SE 7407134 L SE7407134 L SE 7407134L SE 7407134 A SE7407134 A SE 7407134A SE 7407134 A SE7407134 A SE 7407134A SE 7407134 L SE7407134 L SE 7407134L
Authority
SE
Sweden
Prior art keywords
lens
focal length
elements
main
main lens
Prior art date
Application number
SE7407134A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE382262B (en
Inventor
G Vogel
B Moller
J-E Astero
Original Assignee
Lindaco 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 Lindaco Ltd filed Critical Lindaco Ltd
Priority to SE7407134A priority Critical patent/SE382262B/en
Priority to NO751480A priority patent/NO139872C/en
Priority to GB1726775A priority patent/GB1474847A/en
Priority to ES436963A priority patent/ES436963A1/en
Priority to IT22916/75A priority patent/IT1037780B/en
Priority to CA226,075A priority patent/CA1050314A/en
Priority to DE19752519991 priority patent/DE2519991A1/en
Priority to FR7515205A priority patent/FR2273290B1/fr
Priority to AU81292/75A priority patent/AU496288B2/en
Priority to BE156716A priority patent/BE829494A/en
Priority to AT398475A priority patent/AT351828B/en
Priority to SU752136683A priority patent/SU625640A3/en
Priority to FI751515A priority patent/FI751515A/fi
Priority to CH679275A priority patent/CH585910A5/xx
Priority to BR4278/75A priority patent/BR7503348A/en
Priority to DD186283A priority patent/DD120942A5/xx
Priority to HU75LI276A priority patent/HU175781B/en
Priority to CS753750A priority patent/CS192543B2/en
Priority to JP50063946A priority patent/JPS513228A/ja
Priority to NL7506296A priority patent/NL7506296A/en
Priority to DK238075A priority patent/DK238075A/en
Priority to PL1975180786A priority patent/PL104910B1/en
Publication of SE7407134L publication Critical patent/SE7407134L/en
Publication of SE382262B publication Critical patent/SE382262B/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
    • G02B9/14—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - +
    • G02B9/16—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - + all the components being simple
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens

Abstract

1474847 Projection lens systems LINDACO Ltd 25 April 1975 [29 May 1974] 17267/75 Heading G2J In a projection system the lens system comprises a main positive lens, which may be composed of a plurality of elements, and a positive field lens, which may also be composed of a plurality of elements, the field lens being disposed between the object and the main lens, and the main lens having a focal length between 1À2 and 2À5 times the focal length of the system, the system focal length being greater than 400 mm. and having a relative aperture greater than 1:3À5. In a preferred form the main lens is a triplet and the outermost elements have a refractive index less than 1À53, while the central element has a refractive index less than 1À65. In a system of 600 mm. focal length the main lens is conveniently of 900 mm. focal length. The field lens may be of one or two elements, may be a Fresnel lens, and may be of plastics material. It is preferably comparable in size with the object and located mid way between the object and the main lens. It may be axially moveable for focussing. The invention is particularly useful for overhead projectors especially with diffusely radiating objects, e.g. Pictures, T.V. screens etc.
SE7407134A 1974-05-29 1974-05-29 PROJECTION OPTICS. SE382262B (en)

Priority Applications (22)

Application Number Priority Date Filing Date Title
SE7407134A SE382262B (en) 1974-05-29 1974-05-29 PROJECTION OPTICS.
NO751480A NO139872C (en) 1974-05-29 1975-04-24 PROJECTION OPTICS.
GB1726775A GB1474847A (en) 1974-05-29 1975-04-25 Projection lens system
ES436963A ES436963A1 (en) 1974-05-29 1975-04-25 Projection lens system
IT22916/75A IT1037780B (en) 1974-05-29 1975-04-30 PROJECTION LENS SYSTEM
CA226,075A CA1050314A (en) 1974-05-29 1975-05-01 Projection lens system
DE19752519991 DE2519991A1 (en) 1974-05-29 1975-05-05 PROJECTION SYSTEM
FR7515205A FR2273290B1 (en) 1974-05-29 1975-05-15
AU81292/75A AU496288B2 (en) 1974-05-29 1975-05-19 Projection lens system
BE156716A BE829494A (en) 1974-05-29 1975-05-26 PROJECTION OBJECTIVE
AT398475A AT351828B (en) 1974-05-29 1975-05-26 PROJECTION LENS
SU752136683A SU625640A3 (en) 1974-05-29 1975-05-26 Projection objective lens
FI751515A FI751515A (en) 1974-05-29 1975-05-26
CH679275A CH585910A5 (en) 1974-05-29 1975-05-27
BR4278/75A BR7503348A (en) 1974-05-29 1975-05-27 PROJECTION LENS SYSTEM
DD186283A DD120942A5 (en) 1974-05-29 1975-05-27
HU75LI276A HU175781B (en) 1974-05-29 1975-05-27 Projector lens system
CS753750A CS192543B2 (en) 1974-05-29 1975-05-28 Projection lens
JP50063946A JPS513228A (en) 1974-05-29 1975-05-28
NL7506296A NL7506296A (en) 1974-05-29 1975-05-28 PROJECTION LENS SYSTEM.
DK238075A DK238075A (en) 1974-05-29 1975-05-28 PROJECTION OPTICS
PL1975180786A PL104910B1 (en) 1974-05-29 1975-05-28 LENS PROJECTION LAYOUT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7407134A SE382262B (en) 1974-05-29 1974-05-29 PROJECTION OPTICS.

Publications (2)

Publication Number Publication Date
SE7407134L true SE7407134L (en) 1975-12-01
SE382262B SE382262B (en) 1976-01-19

Family

ID=20321270

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7407134A SE382262B (en) 1974-05-29 1974-05-29 PROJECTION OPTICS.

Country Status (21)

Country Link
JP (1) JPS513228A (en)
AT (1) AT351828B (en)
BE (1) BE829494A (en)
BR (1) BR7503348A (en)
CA (1) CA1050314A (en)
CH (1) CH585910A5 (en)
CS (1) CS192543B2 (en)
DD (1) DD120942A5 (en)
DE (1) DE2519991A1 (en)
DK (1) DK238075A (en)
ES (1) ES436963A1 (en)
FI (1) FI751515A (en)
FR (1) FR2273290B1 (en)
GB (1) GB1474847A (en)
HU (1) HU175781B (en)
IT (1) IT1037780B (en)
NL (1) NL7506296A (en)
NO (1) NO139872C (en)
PL (1) PL104910B1 (en)
SE (1) SE382262B (en)
SU (1) SU625640A3 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4311366A (en) * 1978-03-01 1982-01-19 J. H. Dallmeyer Limited Image focusing system
US4380374A (en) * 1981-04-16 1983-04-19 Minnesota Mining & Manufacturing Company Variable focal length projection lens for use on overhead projectors
JP2691566B2 (en) * 1988-06-14 1997-12-17 旭光学工業株式会社 Magnifying projection lens
JP2954217B2 (en) * 1987-12-09 1999-09-27 株式会社日立製作所 Projection lens

Also Published As

Publication number Publication date
CH585910A5 (en) 1977-03-15
ATA398475A (en) 1979-01-15
AU8129275A (en) 1976-11-25
FR2273290B1 (en) 1980-07-11
SE382262B (en) 1976-01-19
IT1037780B (en) 1979-11-20
NO139872B (en) 1979-02-12
PL104910B1 (en) 1979-09-29
CA1050314A (en) 1979-03-13
SU625640A3 (en) 1978-09-25
NO139872C (en) 1979-05-23
GB1474847A (en) 1977-05-25
BR7503348A (en) 1976-04-27
AT351828B (en) 1979-08-10
FR2273290A1 (en) 1975-12-26
DK238075A (en) 1975-11-30
CS192543B2 (en) 1979-08-31
NO751480L (en) 1975-12-02
ES436963A1 (en) 1976-12-01
JPS513228A (en) 1976-01-12
DD120942A5 (en) 1976-07-05
HU175781B (en) 1980-10-28
FI751515A (en) 1975-11-30
DE2519991A1 (en) 1975-12-18
NL7506296A (en) 1975-12-02
BE829494A (en) 1975-09-15

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