GB2008789B - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- GB2008789B GB2008789B GB7842659A GB7842659A GB2008789B GB 2008789 B GB2008789 B GB 2008789B GB 7842659 A GB7842659 A GB 7842659A GB 7842659 A GB7842659 A GB 7842659A GB 2008789 B GB2008789 B GB 2008789B
- Authority
- GB
- United Kingdom
- Prior art keywords
- zoom lens
- zoom
- lens
- 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
Links
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
- G02B15/142—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 two groups only
-
- 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
- G02B15/143—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 three groups only
- G02B15/1431—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 three groups only the first group being positive
- G02B15/143105—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 three groups only the first group being positive arranged +-+
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Lens Barrels (AREA)
- Automatic Focus Adjustment (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1392277A CH621414A5 (US07223432-20070529-C00017.png) | 1977-11-15 | 1977-11-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2008789A GB2008789A (en) | 1979-06-06 |
GB2008789B true GB2008789B (en) | 1982-04-07 |
Family
ID=4396495
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7842659A Expired GB2008789B (en) | 1977-11-15 | 1978-10-31 | Zoom lens |
Country Status (7)
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56159614A (en) * | 1980-05-13 | 1981-12-09 | Asahi Optical Co Ltd | Copying variable magnification lens system |
US4894682A (en) * | 1986-09-30 | 1990-01-16 | Canon Kabushiki Kaisha | Variable magnification copying apparatus |
US6657670B1 (en) * | 1999-03-16 | 2003-12-02 | Teco Image Systems Co., Ltd. | Diaphragm structure of digital still camera |
CN102791155B (zh) | 2009-12-25 | 2015-05-27 | Ykk株式会社 | 钮扣安装用上模 |
AU2017246680B2 (en) | 2016-04-04 | 2021-02-04 | Arq Ip Limited | Solid-liquid crude oil compositions and fractionation processes thereof |
US9777235B2 (en) | 2016-04-04 | 2017-10-03 | Allard Services Limited | Fuel oil compositions and processes |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1947669A (en) * | 1931-09-28 | 1934-02-20 | Bell & Howell Co | Lens of variable equivalent focal length |
GB398307A (en) | 1932-06-16 | 1933-09-14 | Arthur Warmisham | Improvements in variable focus lenses |
DE650907C (de) * | 1934-08-28 | 1937-10-05 | Hugh Iwan Gramatzki | Optisches System |
US2159394A (en) * | 1936-06-09 | 1939-05-23 | Paramount Productions Inc | Variable equivalent focal length lens |
NL90813C (US07223432-20070529-C00017.png) * | 1950-07-18 | |||
US3436145A (en) * | 1964-09-17 | 1969-04-01 | Ednalite Corp | Focusing lens pair combined with photocopying objective |
US3495895A (en) * | 1966-09-01 | 1970-02-17 | Rodenstock Optik G | Apochromatic,symmetrical,wide-angle objective lens system |
AT287341B (de) * | 1969-08-14 | 1971-01-25 | Eumig | Pankratisches Projektionsobjektiv |
US3625595A (en) * | 1970-01-26 | 1971-12-07 | Bell & Howell Co | Self-compensating symmetrical lens system |
JPS491242A (US07223432-20070529-C00017.png) * | 1972-04-17 | 1974-01-08 | ||
US3752565A (en) * | 1972-02-18 | 1973-08-14 | Shima Kogaku Kk | Zoom lens apparatus |
GB1386175A (en) * | 1972-06-02 | 1975-03-05 | Rank Organisation Ltd | Lenses |
US3883228A (en) * | 1973-07-09 | 1975-05-13 | Minnesota Mining & Mfg | Variable magnification zoom lens |
JPS5852201B2 (ja) * | 1974-04-04 | 1983-11-21 | ミノルタ株式会社 | 変倍レンズ |
CH580821A5 (US07223432-20070529-C00017.png) * | 1974-06-13 | 1976-12-15 | Bertele Ludwig | |
US4009928A (en) * | 1975-06-27 | 1977-03-01 | Back Frank G | Three element varifocal lens systems |
US4056308A (en) * | 1976-03-03 | 1977-11-01 | Xerox Corporation | Variable focal length reflector lens system |
DE2703914C2 (de) * | 1976-03-03 | 1986-06-26 | Xerox Corp., Rochester, N.Y. | Vario-Objektiv zur Abbildung zwischen einem festen endlichen Objekt-/Bildebenenabstand |
-
1977
- 1977-11-15 CH CH1392277A patent/CH621414A5/de not_active IP Right Cessation
-
1978
- 1978-10-09 JP JP12371978A patent/JPS5491223A/ja active Pending
- 1978-10-11 IT IT51471/78A patent/IT1106040B/it active
- 1978-10-27 US US05/955,250 patent/US4247168A/en not_active Expired - Lifetime
- 1978-10-31 GB GB7842659A patent/GB2008789B/en not_active Expired
- 1978-11-13 DE DE19782849128 patent/DE2849128A1/de active Granted
- 1978-11-14 FR FR7832135A patent/FR2408846A1/fr active Granted
Also Published As
Publication number | Publication date |
---|---|
DE2849128C2 (US07223432-20070529-C00017.png) | 1989-11-23 |
JPS5491223A (en) | 1979-07-19 |
US4247168A (en) | 1981-01-27 |
GB2008789A (en) | 1979-06-06 |
DE2849128A1 (de) | 1979-05-17 |
IT1106040B (it) | 1985-11-11 |
IT7851471A0 (it) | 1978-10-11 |
CH621414A5 (US07223432-20070529-C00017.png) | 1981-01-30 |
FR2408846A1 (fr) | 1979-06-08 |
FR2408846B1 (US07223432-20070529-C00017.png) | 1984-01-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19941031 |