JPS5486308A - Electrostatic capacity type column sensor - Google Patents

Electrostatic capacity type column sensor

Info

Publication number
JPS5486308A
JPS5486308A JP15481277A JP15481277A JPS5486308A JP S5486308 A JPS5486308 A JP S5486308A JP 15481277 A JP15481277 A JP 15481277A JP 15481277 A JP15481277 A JP 15481277A JP S5486308 A JPS5486308 A JP S5486308A
Authority
JP
Japan
Prior art keywords
electrostatic capacity
tape
changes
sensor
electrode
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
JP15481277A
Other languages
Japanese (ja)
Inventor
Kunio Noguchi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15481277A priority Critical patent/JPS5486308A/en
Publication of JPS5486308A publication Critical patent/JPS5486308A/en
Pending legal-status Critical Current

Links

Landscapes

  • Advancing Webs (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE: To perform reel servo of good efficiency by so constituting the sensor that the changes in electrostatic capacity are nearly linear where the tape positions in column chambers are near the center and the changes become larger above or below there.
CONSTITUTION: At the time when a magnetic tape 3 is taken up through vacuum columns 6, 7, the sensors formed by superposing insulation plates 27, 27' of hollowed inside on both sides of thin film electrodes 29 and further superposing stationary electrodes 22, 22' having holes 24 thereon are provided on the back side of column sensor grooves 10, 11 and the electrode 22 side is mounted hermetically to the air chamber connected to the sensor grooves 10, 11 and the electrode 22' side to the air chamber of the pressure intermediate of the concave side pressure and convex side pressure of tape loops. As a result, if the tape positions are above or below, the changes in electrostatic capacity become larger with respect to the moving distances of the tapes and by detecting these, reel servo of good efficiency may be performed.
COPYRIGHT: (C)1979,JPO&Japio
JP15481277A 1977-12-21 1977-12-21 Electrostatic capacity type column sensor Pending JPS5486308A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15481277A JPS5486308A (en) 1977-12-21 1977-12-21 Electrostatic capacity type column sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15481277A JPS5486308A (en) 1977-12-21 1977-12-21 Electrostatic capacity type column sensor

Publications (1)

Publication Number Publication Date
JPS5486308A true JPS5486308A (en) 1979-07-09

Family

ID=15592406

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15481277A Pending JPS5486308A (en) 1977-12-21 1977-12-21 Electrostatic capacity type column sensor

Country Status (1)

Country Link
JP (1) JPS5486308A (en)

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