JPS5481838A - Zoom lens structure - Google Patents

Zoom lens structure

Info

Publication number
JPS5481838A
JPS5481838A JP13957478A JP13957478A JPS5481838A JP S5481838 A JPS5481838 A JP S5481838A JP 13957478 A JP13957478 A JP 13957478A JP 13957478 A JP13957478 A JP 13957478A JP S5481838 A JPS5481838 A JP S5481838A
Authority
JP
Japan
Prior art keywords
optical axis
cam ring
cam
ring
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.)
Pending
Application number
JP13957478A
Other languages
Japanese (ja)
Inventor
Keiichi Sakaguchi
Noritsugu Hirata
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 JP13957478A priority Critical patent/JPS5481838A/en
Publication of JPS5481838A publication Critical patent/JPS5481838A/en
Pending legal-status Critical Current

Links

Landscapes

  • Lens Barrels (AREA)

Abstract

PURPOSE: To ensure the smooth rotation of a cam ring, properly control it in the direction of an optical axis, and make it possible to effectively eliminate the looseness in the direction of the optical axis by providing a means for energizing the cam ring in the one direction along the optical axis.
CONSTITUTION: Cam ring 17 is provided with cam groove along which the lens L2 of variable magnification system and the lens L3 of correction system are caused to move along the optical axis under the predetermined relationship for the purpose of zooming. Thus, with the rotation of the cam ring 17, the lenses L2 and L3 are moved by the action of the cam groove so as to do zooming. The cam ring 17 is smoothly rotated in the direction of the optical axis with no trouble due to looseness by the action of ring wave spring plate 18 disposed between stepped portion 1c of the firmly fixed lens barrel 1 and the end face of the cam ring 17, hence the stable zoom operation can be done.
COPYRIGHT: (C)1979,JPO&Japio
JP13957478A 1978-11-13 1978-11-13 Zoom lens structure Pending JPS5481838A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13957478A JPS5481838A (en) 1978-11-13 1978-11-13 Zoom lens structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13957478A JPS5481838A (en) 1978-11-13 1978-11-13 Zoom lens structure

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP9098271A Division JPS5630528B2 (en) 1971-11-13 1971-11-13

Publications (1)

Publication Number Publication Date
JPS5481838A true JPS5481838A (en) 1979-06-29

Family

ID=15248425

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13957478A Pending JPS5481838A (en) 1978-11-13 1978-11-13 Zoom lens structure

Country Status (1)

Country Link
JP (1) JPS5481838A (en)

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