NL90813C - - Google Patents

Info

Publication number: NL90813C
Authority: NL; Netherlands

Application number

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.)

1950-07-18

Publication of NL90813C publication Critical patent/NL90813C/xx

Classifications

- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
- G02B15/145125—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +--++

Landscapes

Physics & Mathematics (AREA)
General Physics & Mathematics (AREA)
Optics & Photonics (AREA)
Lenses (AREA)
Mechanical Light Control Or Optical Switches (AREA)
Exposure Or Original Feeding In Electrophotography (AREA)

NL90813D 1950-07-18 NL90813C (xx)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
GB17981/50A GB685945A (en)	1950-07-18	1950-07-18	Improvements in or relating to variable magnification optical systems

Publications (1)

Publication Number	Publication Date
NL90813C true NL90813C (xx)

Family

ID=10104576

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
NL90813D NL90813C (xx)	1950-07-18

Country Status (4)

Country	Link
US (1)	US2663223A (xx)
DE (1)	DE1032571B (xx)
GB (1)	GB685945A (xx)
NL (1)	NL90813C (xx)

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB713024A (en) *	1951-10-05	1954-08-04	Watson W & Sons Ltd	Improvements in or relating to variable magnification optical systems
US2720817A (en) *	1953-04-23	1955-10-18	Taylor Taylor & Hobson Ltd	Control devices for variable focal length optical objectives
GB760588A (en) *	1953-10-09	1956-11-07	Watson W & Sons Ltd	Improvements in or relating to variable magnification optical systems
US2782683A (en) *	1954-02-18	1957-02-26	Joseph B Walker	Selective electrical lens adjusting machanisms for variable magnification systems
DE1074874B (de) *	1954-02-18	1960-02-04	Long Island N Y Frank Gerard Back Glen Cove (V St A)	Objektiv mit veränderlicher Brennweite
FR1120271A (fr) *	1955-01-24	1956-07-03		Objectif à longueur focale variable
US2766658A (en) *	1955-05-20	1956-10-16	Schwesinger Gerhard	Variable focal length focusing lens system and device therefor
US2908199A (en) *	1957-05-03	1959-10-13	Edward K Kaprelian	Variable focal length lens system
US2940373A (en) *	1958-05-06	1960-06-14	Berg	Mounting and operating means for zoom lenses for television and motion picture cameras
US3004471A (en) *	1958-06-06	1961-10-17	Taylor Taylor & Hobson Ltd	Control devices for optical objectives of variable focal length
US3027805A (en) *	1958-10-22	1962-04-03	Canon Camera Co	Zoom lens system
US3023673A (en) *	1958-12-12	1962-03-06	Bell & Howell Co	Variable magnification afocal lens member
NL253793A (xx) *	1959-07-14
DE1108935B (de) *	1959-09-29	1961-06-15	Rodenstock Optik G	Optisches System mit veraenderlicher Brennweite
US3029700A (en) *	1959-11-25	1962-04-17	Eastman Kodak Co	Variable magnification afocal lens converter
DE1167555B (de) *	1959-11-25	1964-04-09	Kodak Ag	Afokales Objektivvorsatzsystem mit veraenderlicher Vergroesserung
DE1183354B (de) *	1960-04-01	1964-12-10	Vockenhuber Karl	Kamera, insbesondere Schmalfilmkamera
US3360326A (en) *	1965-02-24	1967-12-26	Isco Optische Werke Gmbh	High-speed varifocal objective
US3591256A (en) *	1968-04-15	1971-07-06	Xerox Corp	Variable magnification lens system
US3549250A (en) *	1968-04-29	1970-12-22	Axel Pantenburg	Slide projector with continuously variable detail magnification
US3600066A (en) *	1969-06-02	1971-08-17	Xerox Corp	Optical assembly with supplemental lens means
JPS5652291B2 (xx) *	1973-02-13	1981-12-11
JPS5141354B2 (xx) *	1973-02-24	1976-11-09
US4056308A (en) *	1976-03-03	1977-11-01	Xerox Corporation	Variable focal length reflector lens system
US4061419A (en) *	1976-03-03	1977-12-06	Xerox Corporation	Variable magnification lens system
US4156933A (en) *	1977-07-28	1979-05-29	Pandres Dave Jr	Ratio preserving control system
WO1979000072A1 (en) *	1977-07-28	1979-02-22	D Pandres	Ratio preserving control system
CH621414A5 (xx) *	1977-11-15	1981-01-30	Gretag Ag
JPS578515A (en) *	1980-06-19	1982-01-16	Canon Inc	Zoom lens
JPS6057335A (ja) *	1983-09-08	1985-04-03	Asahi Optical Co Ltd	複写機の変倍装置
JPS6076730A (ja) *	1983-10-03	1985-05-01	Asahi Optical Co Ltd	変倍複写機のズ−ムレンズ鏡筒
JP3723643B2 (ja) *	1996-08-12	2005-12-07	ペンタックス株式会社	高変倍ズームレンズ系
DE19837135C5 (de) *	1997-09-29	2016-09-22	Carl Zeiss Meditec Ag	Afokales Zoomsystem

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US1790232A (en) *	1927-03-21	1931-01-27	Paramount Publix Corp	Photographic apparatus
US1947669A (en) *	1931-09-28	1934-02-20	Bell & Howell Co	Lens of variable equivalent focal length
US2107305A (en) *	1934-03-02	1938-02-08	Dartmouth College	Adjustable lens system
US2235364A (en) *	1935-03-24	1941-03-18	Gramatzki Hugh John	Afocal camera lens attachment
US2159394A (en) *	1936-06-09	1939-05-23	Paramount Productions Inc	Variable equivalent focal length lens
US2165341A (en) *	1936-07-28	1939-07-11	Eastman Kodak Co	Photographic objective
US2353565A (en) *	1943-11-04	1944-07-11	Isadore Nochlin And Sam Schwar	Optical view finder
US2454686A (en) *	1946-07-30	1948-11-23	Frank G Back	Varifocal lens for cameras
US2501219A (en) *	1947-11-03	1950-03-21	Watson W & Sons Ltd	Variable magnification optical system
US2514239A (en) *	1948-07-02	1950-07-04	Watson W & Sons Ltd	Variable magnification optical system
GB646409A (en) *	1948-07-02	1950-11-22	Watson W & Sons Ltd	Improvements in or relating to variable magnification optical systems

0
- NL NL90813D patent/NL90813C/xx active
1950
- 1950-07-18 GB GB17981/50A patent/GB685945A/en not_active Expired
1951
- 1951-07-13 US US236482A patent/US2663223A/en not_active Expired - Lifetime
- 1951-07-17 DE DEW6277A patent/DE1032571B/de active Pending

Also Published As

Publication number	Publication date
US2663223A (en)	1953-12-22
GB685945A (en)	1953-01-14
DE1032571B (de)	1958-06-19

Publication	Publication Date	Title
AT195820B (xx)	1958-02-25
AT165408B (xx)	1950-02-25
FR954721A (xx)	1950-01-05
BE494875A (xx)
BE494864A (xx)	1950-07-17
BE494655A (xx)
BE494643A (xx)
BE494442A (xx)
BE494262A (xx)	1950-07-01
BE494252A (xx)
BE494127A (xx)
BE494028A (xx)
BE494021A (xx)
BE493852A (xx)
BE493522A (xx)
BE493509A (xx)
BE493420A (xx)
BE493380A (xx)
BE493367A (xx)	1950-05-16
BE493362A (xx)
BE493351A (xx)
BE493329A (xx)
BE493328A (xx)
BE493326A (xx)
BE489017A (xx)