JPS554023A - Zoom lens - Google Patents

Zoom lens

Info

Publication number
JPS554023A
JPS554023A JP7612578A JP7612578A JPS554023A JP S554023 A JPS554023 A JP S554023A JP 7612578 A JP7612578 A JP 7612578A JP 7612578 A JP7612578 A JP 7612578A JP S554023 A JPS554023 A JP S554023A
Authority
JP
Japan
Prior art keywords
cam
pin
object side
moving
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.)
Pending
Application number
JP7612578A
Other languages
Japanese (ja)
Inventor
Atsushi Someya
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP7612578A priority Critical patent/JPS554023A/en
Priority to US06/049,165 priority patent/US4256371A/en
Priority to DE19792925355 priority patent/DE2925355A1/en
Publication of JPS554023A publication Critical patent/JPS554023A/en
Pending legal-status Critical Current

Links

Landscapes

  • Lens Barrels (AREA)
  • Lenses (AREA)

Abstract

PURPOSE: To expand the existing movable focal length range by so constituting the zoom lens that the spacing of moving lens groups is changed and that the means of defining the positions of the moving lens groups during zooming is changed to the other position defining means.
CONSTITUTION: When a tuning ring 24 is turned in the case of additionally expanding the existing variable focal length region, a driving pin 22 and extending pin 23 are pushed out to the object side by the actuation a linear cam groove 10d and cam grooves 25a, 25b which define the movement quantity. This causes the outer barrel 15 engaging to the pin 22 to slide to the object side and at the same time the cam pin 21 of the lens group III to move to the object side, so that it is nipped by the other curving sides 18a and 19b of the cam opening. In addition, since the pin 23 causes the moving barrel 11 to slide to the object side by the specified quantity, the gear 27 moves to a revolving shaft 30. Hence, a cam barrel 13 and combined cam barrels 14, 15 are rotated by a driving device 31, and the lens group III is moved on the moving curve separate from that of the lens group II, whereby the range of focal length is additionally expanded.
COPYRIGHT: (C)1980,JPO&Japio
JP7612578A 1978-06-23 1978-06-23 Zoom lens Pending JPS554023A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP7612578A JPS554023A (en) 1978-06-23 1978-06-23 Zoom lens
US06/049,165 US4256371A (en) 1978-06-23 1979-06-18 Zoom lens with extended variable focal length range
DE19792925355 DE2925355A1 (en) 1978-06-23 1979-06-22 VARIO LENS SYSTEM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7612578A JPS554023A (en) 1978-06-23 1978-06-23 Zoom lens

Publications (1)

Publication Number Publication Date
JPS554023A true JPS554023A (en) 1980-01-12

Family

ID=13596194

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7612578A Pending JPS554023A (en) 1978-06-23 1978-06-23 Zoom lens

Country Status (1)

Country Link
JP (1) JPS554023A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH055819A (en) * 1991-06-27 1993-01-14 Canon Inc Zoom lens barrel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH055819A (en) * 1991-06-27 1993-01-14 Canon Inc Zoom lens barrel

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