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GB1064323A - Improvements in or relating to optical objectives of variable equivalent focal length - Google Patents

Improvements in or relating to optical objectives of variable equivalent focal length

Info

Publication number
GB1064323A
GB1064323A GB35088/62A GB3508862A GB1064323A GB 1064323 A GB1064323 A GB 1064323A GB 35088/62 A GB35088/62 A GB 35088/62A GB 3508862 A GB3508862 A GB 3508862A GB 1064323 A GB1064323 A GB 1064323A
Authority
GB
United Kingdom
Prior art keywords
objective
range
component
equivalent focal
focal length
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
Application number
GB35088/62A
Inventor
Gordon Henry Cook
Peter Arnold Merigold
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.)
Rank Precision Industries Ltd
Original Assignee
Rank Precision Industries 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 Rank Precision Industries Ltd filed Critical Rank Precision Industries Ltd
Priority to GB35088/62A priority Critical patent/GB1064323A/en
Priority to DER36100A priority patent/DE1289327B/en
Priority to FR947414A priority patent/FR1376655A/en
Priority to CH1131563A priority patent/CH411383A/en
Priority to JP38049040A priority patent/JPS5231743B1/ja
Publication of GB1064323A publication Critical patent/GB1064323A/en
Expired legal-status Critical Current

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
    • G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/163—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
    • G02B15/167—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
    • G02B15/17—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +--
    • 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
    • G02B15/144—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 four groups only
    • G02B15/1441—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 four groups only the first group being positive
    • G02B15/144109—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 four groups only the first group being positive arranged +--+

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)

Abstract

1,64,323. Zoom lenses. RANK PRECISION INDUSTRIES Ltd., [trading as RANK ORGANISATION RANK TAYLOR HOBSON DIVISION]. Sept.10, 1963 [Sept. 14, 1962], No.35088/62. Heading G2J. The objective, which is corrected for spherical and chromatic aberrations, coma, astigmatism, field curvature and distortion has four members LA, LB, LC, LD in which (a) LA and LD are convergent and stationary, (b) Lc and LD are divergent and movable, (c) the equivalent focal lengths fB and fc respectively of members LB and Lc lie numerically respectively between 4 and 8 and 5 and 10 times the minimum value of the ratio of the equivalent focal length of the objective to the f - number thereof e.g. fB is 5À88 and fc is 7À27 times such minimum value, (d) LB consists of a divergent simple meniscus component with its surfaces R8, R9 convex to the front followed by a divergent compound component and performing in the range of variation a total axial movement lying numerically between 1À5fB and 2À5fB e.g. 1À994fB, (e) Lc consists of a doublet component having a front surface R14 concave to the front with a radius of curvature lying numerically between 0À5 fc and 1À0 fc e.g. 0À72 fc and moves a total distance between 0À25 fc and 0À5 fc, e.g. 0À305 fc and (f) the minimum separation between LB and Lc occurs when the equivalent focal length of the objective is greater than half its maximum value in the range of variation e. g. is 0À745 times such value. The compound component of LB consists of a triplet component having a convergent element between two divergent elements. The member LA is moved for focusing at different object distances. The member LD may take various forms, Figs. 2-4 (not shown), in some of which there is an aspheric surface such as R23, and an achromatic doublet component may be provided interchangeably behind the member LD to increase the values of equivalent focal length of the objective throughout the range of variation e. g. without the additional doublet the range may be from a minimum Fo to 10Fo, with a particular added doublet Fig. 5 (not shown) the range is 1À5 Fo to 15 Fo and in another example, Fig. 6 (not shown) it is 2 Fo to 20 Fo. Optical data are given for four examples of objective and two examples of supplementary achromatic doublets.
GB35088/62A 1962-09-14 1962-09-14 Improvements in or relating to optical objectives of variable equivalent focal length Expired GB1064323A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB35088/62A GB1064323A (en) 1962-09-14 1962-09-14 Improvements in or relating to optical objectives of variable equivalent focal length
DER36100A DE1289327B (en) 1962-09-14 1963-09-12 Lens with changeable equivalent focal length
FR947414A FR1376655A (en) 1962-09-14 1963-09-13 Improvements to varifocal lenses
CH1131563A CH411383A (en) 1962-09-14 1963-09-13 Variable focal length optical lens
JP38049040A JPS5231743B1 (en) 1962-09-14 1963-09-14

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35088/62A GB1064323A (en) 1962-09-14 1962-09-14 Improvements in or relating to optical objectives of variable equivalent focal length

Publications (1)

Publication Number Publication Date
GB1064323A true GB1064323A (en) 1967-04-05

Family

ID=10373658

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35088/62A Expired GB1064323A (en) 1962-09-14 1962-09-14 Improvements in or relating to optical objectives of variable equivalent focal length

Country Status (5)

Country Link
JP (1) JPS5231743B1 (en)
CH (1) CH411383A (en)
DE (1) DE1289327B (en)
FR (1) FR1376655A (en)
GB (1) GB1064323A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2316500A (en) * 1996-08-12 1998-02-25 Asahi Optical Co Ltd Four group zoom lens system having high zoom ratio
GB2316499A (en) * 1996-08-12 1998-02-25 Asahi Optical Co Ltd Fast aspherical four group zoom lens system
CN105676434A (en) * 2016-04-27 2016-06-15 佛山华国光学器材有限公司 Fog-reducing 60X large-zoom-ratio optical system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1520489A (en) * 1967-01-25 1968-04-12 Optique Prec Soc D Variable focal length lens

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB760588A (en) * 1953-10-09 1956-11-07 Watson W & Sons Ltd Improvements in or relating to variable magnification optical systems
US2766658A (en) * 1955-05-20 1956-10-16 Schwesinger Gerhard Variable focal length focusing lens system and device therefor
US3038378A (en) * 1959-01-12 1962-06-12 Bell & Howell Co Variable focal length optical objective
DE1109397B (en) * 1959-04-20 1961-06-22 Dresden Feinmess Bright lens of variable focal length with at least 6 times the range of variation

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2316500A (en) * 1996-08-12 1998-02-25 Asahi Optical Co Ltd Four group zoom lens system having high zoom ratio
GB2316499A (en) * 1996-08-12 1998-02-25 Asahi Optical Co Ltd Fast aspherical four group zoom lens system
US5815323A (en) * 1996-08-12 1998-09-29 Asahi Kogaku Kogyo Kabushiki Kaisha Fast aspherical zoom lens system
US5815322A (en) * 1996-08-12 1998-09-29 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens system having high zoom ratio
GB2316500B (en) * 1996-08-12 2000-10-11 Asahi Optical Co Ltd Four group zoom lens system having high zoom ratio
GB2316499B (en) * 1996-08-12 2001-01-03 Asahi Optical Co Ltd Fast aspherical four group zoom lens system
DE19734919B4 (en) * 1996-08-12 2005-02-10 Pentax Corp. zoom lens
CN105676434A (en) * 2016-04-27 2016-06-15 佛山华国光学器材有限公司 Fog-reducing 60X large-zoom-ratio optical system
CN105676434B (en) * 2016-04-27 2018-08-21 佛山华国光学器材有限公司 A kind of big variable-power optical systems of Penetrating Fog 60X

Also Published As

Publication number Publication date
CH411383A (en) 1966-04-15
JPS5231743B1 (en) 1977-08-17
DE1289327B (en) 1969-02-13
FR1376655A (en) 1964-10-31

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