FR2408846A1 - Objectif a focale variable - Google Patents
Objectif a focale variableInfo
- Publication number
- FR2408846A1 FR2408846A1 FR7832135A FR7832135A FR2408846A1 FR 2408846 A1 FR2408846 A1 FR 2408846A1 FR 7832135 A FR7832135 A FR 7832135A FR 7832135 A FR7832135 A FR 7832135A FR 2408846 A1 FR2408846 A1 FR 2408846A1
- Authority
- FR
- France
- Prior art keywords
- variable focal
- objective
- focal objective
- median element
- elements
- 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
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)
- Automatic Focus Adjustment (AREA)
- Lens Barrels (AREA)
Abstract
LA PRESENTE INVENTION CONCERNE UN OBJECTIF A FOCALE VARIABLE CONSTITUE PAR TROIS ELEMENTS DISPOSES DANS UNE MONTURE, ET UN DIAPHRAGME MONTE SUR UN DE CES ELEMENTS, L'ELEMENT MEDIAN ETANT MOBILE PAR RAPPORT AUX DEUX AUTRES. L'ELEMENT MEDIAN EST CARACTERISE PAR UN POUVOIR DE REFRACTION POSITIF, QUI EST LE PLUS GRAND EN VALEUR ABSOLUE. L'OBJECTIF SELON L'INVENTION EST PLUS SPECIALEMENT DESTINE A ETRE MONTE SUR LES APPAREILS DE REPRODUCTION OU LES TIREUSES PHOTOGRAPHIQUES.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1392277A CH621414A5 (fr) | 1977-11-15 | 1977-11-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2408846A1 true FR2408846A1 (fr) | 1979-06-08 |
FR2408846B1 FR2408846B1 (fr) | 1984-01-13 |
Family
ID=4396495
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7832135A Granted FR2408846A1 (fr) | 1977-11-15 | 1978-11-14 | Objectif a focale variable |
Country Status (7)
Country | Link |
---|---|
US (1) | US4247168A (fr) |
JP (1) | JPS5491223A (fr) |
CH (1) | CH621414A5 (fr) |
DE (1) | DE2849128A1 (fr) |
FR (1) | FR2408846A1 (fr) |
GB (1) | GB2008789B (fr) |
IT (1) | IT1106040B (fr) |
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 |
WO2011077571A1 (fr) | 2009-12-25 | 2011-06-30 | Ykk株式会社 | Matrice supérieure pour montage de bouton |
US9777235B2 (en) | 2016-04-04 | 2017-10-03 | Allard Services Limited | Fuel oil compositions and processes |
AU2017246680B2 (en) | 2016-04-04 | 2021-02-04 | Arq Ip Limited | Solid-liquid crude oil compositions and fractionation processes thereof |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2159394A (en) * | 1936-06-09 | 1939-05-23 | Paramount Productions Inc | Variable equivalent focal length lens |
US2663223A (en) * | 1950-07-18 | 1953-12-22 | Watson W & Sons Ltd | Variable magnification optical system |
US3625595A (en) * | 1970-01-26 | 1971-12-07 | Bell & Howell Co | Self-compensating symmetrical lens system |
US3883228A (en) * | 1973-07-09 | 1975-05-13 | Minnesota Mining & Mfg | Variable magnification zoom lens |
US4009928A (en) * | 1975-06-27 | 1977-03-01 | Back Frank G | Three element varifocal lens systems |
GB1495062A (en) * | 1974-06-13 | 1977-12-14 | Bertele L | Objectives having variable focal length |
Family Cites Families (12)
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 |
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 |
JPS491242A (fr) * | 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 |
JPS5852201B2 (ja) * | 1974-04-04 | 1983-11-21 | ミノルタ株式会社 | 変倍レンズ |
DE2703914C2 (de) * | 1976-03-03 | 1986-06-26 | Xerox Corp., Rochester, N.Y. | Vario-Objektiv zur Abbildung zwischen einem festen endlichen Objekt-/Bildebenenabstand |
US4056308A (en) * | 1976-03-03 | 1977-11-01 | Xerox Corporation | Variable focal length reflector lens system |
-
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
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2159394A (en) * | 1936-06-09 | 1939-05-23 | Paramount Productions Inc | Variable equivalent focal length lens |
US2663223A (en) * | 1950-07-18 | 1953-12-22 | Watson W & Sons Ltd | Variable magnification optical system |
US3625595A (en) * | 1970-01-26 | 1971-12-07 | Bell & Howell Co | Self-compensating symmetrical lens system |
US3883228A (en) * | 1973-07-09 | 1975-05-13 | Minnesota Mining & Mfg | Variable magnification zoom lens |
GB1495062A (en) * | 1974-06-13 | 1977-12-14 | Bertele L | Objectives having variable focal length |
US4009928A (en) * | 1975-06-27 | 1977-03-01 | Back Frank G | Three element varifocal lens systems |
Also Published As
Publication number | Publication date |
---|---|
JPS5491223A (en) | 1979-07-19 |
GB2008789B (en) | 1982-04-07 |
US4247168A (en) | 1981-01-27 |
CH621414A5 (fr) | 1981-01-30 |
FR2408846B1 (fr) | 1984-01-13 |
DE2849128A1 (de) | 1979-05-17 |
DE2849128C2 (fr) | 1989-11-23 |
IT7851471A0 (it) | 1978-10-11 |
GB2008789A (en) | 1979-06-06 |
IT1106040B (it) | 1985-11-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |