JPS5665105A - Variable magnification lens built-in lens system - Google Patents

Variable magnification lens built-in lens system

Info

Publication number
JPS5665105A
JPS5665105A JP14187079A JP14187079A JPS5665105A JP S5665105 A JPS5665105 A JP S5665105A JP 14187079 A JP14187079 A JP 14187079A JP 14187079 A JP14187079 A JP 14187079A JP S5665105 A JPS5665105 A JP S5665105A
Authority
JP
Japan
Prior art keywords
turret
amplifier
motor
voltage
differential voltage
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
JP14187079A
Other languages
Japanese (ja)
Inventor
Takashi Onuma
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 JP14187079A priority Critical patent/JPS5665105A/en
Publication of JPS5665105A publication Critical patent/JPS5665105A/en
Pending legal-status Critical Current

Links

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  • Lens Barrels (AREA)

Abstract

PURPOSE: To perform changing-over lenses accurately and repidly by providing a servocontroller having a blind area absorbing the outputs of a comparator of the rotating position assignment signal and rotating position detection signal of a turret and a comparator in a click groove.
CONSTITUTION: Position command signals 16W18 of various extenders are selected by a switch 19 and the differential voltage from the detection signal of a turret position detecting potentiometer 13 is obtained by an amplifier 29. Further, the differential voltage thereof is amplified by a motor drive amplifier 30 and power transistors 31, 32, and a motor 11 is driven. Here, when the turret begins to drop into a desired click point, said differential voltage is absorbed by a blind zone amplifier constituted by the amplifier 30, a resistance R1 and diodes D1WD4 and the voltage upon the motor becomes zero. In areas other than the click point, it turns out that the voltage is kept applied to the motor at all times, and even if the turret tries to go beyond the click point owing to inertia or the like, it is pulled back and a static position is thus given.
COPYRIGHT: (C)1981,JPO&Japio
JP14187079A 1979-10-31 1979-10-31 Variable magnification lens built-in lens system Pending JPS5665105A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14187079A JPS5665105A (en) 1979-10-31 1979-10-31 Variable magnification lens built-in lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14187079A JPS5665105A (en) 1979-10-31 1979-10-31 Variable magnification lens built-in lens system

Publications (1)

Publication Number Publication Date
JPS5665105A true JPS5665105A (en) 1981-06-02

Family

ID=15302071

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14187079A Pending JPS5665105A (en) 1979-10-31 1979-10-31 Variable magnification lens built-in lens system

Country Status (1)

Country Link
JP (1) JPS5665105A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59114506U (en) * 1983-01-21 1984-08-02 キヤノン株式会社 variable magnification device
JPS61116317U (en) * 1984-12-29 1986-07-23
JPS6258417U (en) * 1985-10-01 1987-04-11
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
JPH0496707U (en) * 1991-01-30 1992-08-21

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5469431A (en) * 1977-11-14 1979-06-04 Canon Inc Lens system built-in with variable power lens

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5469431A (en) * 1977-11-14 1979-06-04 Canon Inc Lens system built-in with variable power lens

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59114506U (en) * 1983-01-21 1984-08-02 キヤノン株式会社 variable magnification device
JPS61116317U (en) * 1984-12-29 1986-07-23
JPS6258417U (en) * 1985-10-01 1987-04-11
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
JPH0496707U (en) * 1991-01-30 1992-08-21

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