JPS5469431A - Lens system built-in with variable power lens - Google Patents

Lens system built-in with variable power lens

Info

Publication number
JPS5469431A
JPS5469431A JP13707777A JP13707777A JPS5469431A JP S5469431 A JPS5469431 A JP S5469431A JP 13707777 A JP13707777 A JP 13707777A JP 13707777 A JP13707777 A JP 13707777A JP S5469431 A JPS5469431 A JP S5469431A
Authority
JP
Japan
Prior art keywords
turret
comparator
click
motor
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.)
Granted
Application number
JP13707777A
Other languages
Japanese (ja)
Other versions
JPS6118724B2 (en
Inventor
Kenji Fujikawa
Kimio Tanaka
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 JP13707777A priority Critical patent/JPS5469431A/en
Publication of JPS5469431A publication Critical patent/JPS5469431A/en
Publication of JPS6118724B2 publication Critical patent/JPS6118724B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Lens Barrels (AREA)

Abstract

PURPOSE: To let a turret be smoothly stopped by a specified gain in the position determined by a click mechanism by magnifying the blind zone of the servo system when the turret is click-stopped.
CONSTITUTION: In the case of setting a select switch 19 from the state set at the equal magnification command potential to an extender of 1.5 times, the difference between the position signal from a turret-position-detecting potential 13 and the instruction signal from a command potentiometer 17 is large and therefore a comparator 15 produces a high output even at a low gain, causing a servo motor 11 to run. When this revolution causes a tension roller 22 to drop into a click groove 21, the output of the comparator 15 becomes small and the motor stops, putting the turret in the held state. Since the blind zone of the servo system has increased owing to a considerable decrease in the output of the comparator 15, the motor 11 does not actuate, thus stable state is obtained.
COPYRIGHT: (C)1979,JPO&Japio
JP13707777A 1977-11-14 1977-11-14 Lens system built-in with variable power lens Granted JPS5469431A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13707777A JPS5469431A (en) 1977-11-14 1977-11-14 Lens system built-in with variable power lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13707777A JPS5469431A (en) 1977-11-14 1977-11-14 Lens system built-in with variable power lens

Publications (2)

Publication Number Publication Date
JPS5469431A true JPS5469431A (en) 1979-06-04
JPS6118724B2 JPS6118724B2 (en) 1986-05-14

Family

ID=15190353

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13707777A Granted JPS5469431A (en) 1977-11-14 1977-11-14 Lens system built-in with variable power lens

Country Status (1)

Country Link
JP (1) JPS5469431A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5665105A (en) * 1979-10-31 1981-06-02 Canon Inc Variable magnification lens built-in lens system
JPH02501863A (en) * 1987-03-09 1990-06-21 ライカ　インドゥストリーフェルヴァルツング　ゲゼルシャフト　ミット　ベシュレンクテル　ハフツング Nosepiece rotation device for optical components and method for adjusting the rotation speed of this rotation device
US6079694A (en) * 1998-03-31 2000-06-27 Kawasaki Jukogyo Kabushiki Kaisha Fluid pressure device
JP2005351967A (en) * 2004-06-08 2005-12-22 Canon Inc Optical device and imaging system
US7146998B2 (en) 2001-11-09 2006-12-12 Honda Giken Kogyo Kabushiki Kaisha Hydraulic valve

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6358919U (en) * 1986-10-08 1988-04-19

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5665105A (en) * 1979-10-31 1981-06-02 Canon Inc Variable magnification lens built-in lens system
JPH02501863A (en) * 1987-03-09 1990-06-21 ライカ　インドゥストリーフェルヴァルツング　ゲゼルシャフト　ミット　ベシュレンクテル　ハフツング Nosepiece rotation device for optical components and method for adjusting the rotation speed of this rotation device
US6079694A (en) * 1998-03-31 2000-06-27 Kawasaki Jukogyo Kabushiki Kaisha Fluid pressure device
US7146998B2 (en) 2001-11-09 2006-12-12 Honda Giken Kogyo Kabushiki Kaisha Hydraulic valve
JP2005351967A (en) * 2004-06-08 2005-12-22 Canon Inc Optical device and imaging system
JP4498019B2 (en) * 2004-06-08 2010-07-07 キヤノン株式会社 Optical apparatus and imaging system

Also Published As

Publication number Publication date
JPS6118724B2 (en) 1986-05-14

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