JPS55139602A - Pickup arm unit - Google Patents

Pickup arm unit

Info

Publication number
JPS55139602A
JPS55139602A JP4414979A JP4414979A JPS55139602A JP S55139602 A JPS55139602 A JP S55139602A JP 4414979 A JP4414979 A JP 4414979A JP 4414979 A JP4414979 A JP 4414979A JP S55139602 A JPS55139602 A JP S55139602A
Authority
JP
Japan
Prior art keywords
arm
axis
electromagnetic
detecting method
cartridge
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
JP4414979A
Other languages
Japanese (ja)
Inventor
Masayuki Inoue
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4414979A priority Critical patent/JPS55139602A/en
Publication of JPS55139602A publication Critical patent/JPS55139602A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make it possible to damp the low frequency resonance of every cartridge best without any adjustment by coaxially providing an electromagnetic detecting method and electromagnetic driving method to the axis of rotation of a pickup arm.
CONSTITUTION: Arm holder 17 supported being vertically rotatable on vertical rotation axis 5 is provided with pickup arm 1 and weight shaft 18. At both the ends of arm holder 17, electromagnetic detecting method 15 detecting arm 1 rotating on axis 5 and electromagnetic driving method 16 driving arm 1 to rotate on axis 5 are provided being coaxial to axis 5. The output signal of detecting method 15 proportional to the vertical rotating motion of arm 1 drives driving method 16 through filter 12 and amplifier 13 to damp its low frequency resonance. Even when cartridge 2 is replaced, this constitution makes the output of detecting method 15 constant without reference to an in-use cartridge, and consequently an adjustment of the gain of amplifier 13 is unneeded.
COPYRIGHT: (C)1980,JPO&Japio
JP4414979A 1979-04-13 1979-04-13 Pickup arm unit Pending JPS55139602A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4414979A JPS55139602A (en) 1979-04-13 1979-04-13 Pickup arm unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4414979A JPS55139602A (en) 1979-04-13 1979-04-13 Pickup arm unit

Publications (1)

Publication Number Publication Date
JPS55139602A true JPS55139602A (en) 1980-10-31

Family

ID=12683565

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4414979A Pending JPS55139602A (en) 1979-04-13 1979-04-13 Pickup arm unit

Country Status (1)

Country Link
JP (1) JPS55139602A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101107200B1 (en) * 2009-04-22 2012-01-25 대호 (주) Harrow for Tractor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101107200B1 (en) * 2009-04-22 2012-01-25 대호 (주) Harrow for Tractor

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