JPS641155A - Index signal circuit - Google Patents

Index signal circuit

Info

Publication number
JPS641155A
JPS641155A JP15502687A JP15502687A JPS641155A JP S641155 A JPS641155 A JP S641155A JP 15502687 A JP15502687 A JP 15502687A JP 15502687 A JP15502687 A JP 15502687A JP S641155 A JPS641155 A JP S641155A
Authority
JP
Japan
Prior art keywords
sensor
comparator
index signal
circuit
input signal
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
JP15502687A
Other languages
Japanese (ja)
Other versions
JPH0766614B2 (en
JPH011155A (en
Inventor
Takuya Isoda
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.)
Nidec Corp
Original Assignee
Nidec Corp
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 Nidec Corp filed Critical Nidec Corp
Priority to JP62155026A priority Critical patent/JPH0766614B2/en
Publication of JPH011155A publication Critical patent/JPH011155A/en
Publication of JPS641155A publication Critical patent/JPS641155A/en
Publication of JPH0766614B2 publication Critical patent/JPH0766614B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Rotational Drive Of Disk (AREA)

Abstract

PURPOSE: To reduce a drift due to temperature variation, source voltage variation, etc., by inputting an input signal from a sensor to 1st and 2nd comparators, inputting their outputs to an AND circuit or NAND circuit 14, and outputting an index signal.
CONSTITUTION: The input signal from the sensor 8 which detects an object detection point 7 of the rotor 6 of a disk storage device is inputted to the minus side of the 1st comparator 11 and the plus side of the comparator 11 is grounded while its minus side is connected to the minus side of the 2nd comparator 12, whose plus side is grounded. Then the outputs of the 1st comparator 11 and 2nd comparator 12 are inputted to the AND circuit or NAND circuit 14 to output the index signal 15. A magnetic sensor is suitable as the sensor 8, but another sensor can be used freely. Consequently, even if the input signal from the sensor 8 varies in amplitude owing to temperature or the gap between the sensor 8 and rotor 6, pulses which do not vary are obtained as the index signal 15.
COPYRIGHT: (C)1989,JPO&Japio
JP62155026A 1987-06-22 1987-06-22 Index signal circuit Expired - Lifetime JPH0766614B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62155026A JPH0766614B2 (en) 1987-06-22 1987-06-22 Index signal circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62155026A JPH0766614B2 (en) 1987-06-22 1987-06-22 Index signal circuit

Publications (3)

Publication Number Publication Date
JPH011155A JPH011155A (en) 1989-01-05
JPS641155A true JPS641155A (en) 1989-01-05
JPH0766614B2 JPH0766614B2 (en) 1995-07-19

Family

ID=15597045

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62155026A Expired - Lifetime JPH0766614B2 (en) 1987-06-22 1987-06-22 Index signal circuit

Country Status (1)

Country Link
JP (1) JPH0766614B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019190971A (en) * 2018-04-24 2019-10-31 エイブリック株式会社 Zero-crossing detection circuit and sensor device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5745716A (en) * 1980-09-01 1982-03-15 Comput Basic Mach Technol Res Assoc Magnetic disc device
JPS5745719A (en) * 1980-09-01 1982-03-15 Comput Basic Mach Technol Res Assoc Readout circuit for magnetic disc device
JPS59167812A (en) * 1983-03-14 1984-09-21 Toshiba Corp Signal detecting circuit
JPS6161670U (en) * 1984-09-28 1986-04-25
JPS61101846U (en) * 1984-12-10 1986-06-28
JPS62135720A (en) * 1985-12-09 1987-06-18 Nippon Densan Kk Waveform output device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5745716A (en) * 1980-09-01 1982-03-15 Comput Basic Mach Technol Res Assoc Magnetic disc device
JPS5745719A (en) * 1980-09-01 1982-03-15 Comput Basic Mach Technol Res Assoc Readout circuit for magnetic disc device
JPS59167812A (en) * 1983-03-14 1984-09-21 Toshiba Corp Signal detecting circuit
JPS6161670U (en) * 1984-09-28 1986-04-25
JPS61101846U (en) * 1984-12-10 1986-06-28
JPS62135720A (en) * 1985-12-09 1987-06-18 Nippon Densan Kk Waveform output device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019190971A (en) * 2018-04-24 2019-10-31 エイブリック株式会社 Zero-crossing detection circuit and sensor device

Also Published As

Publication number Publication date
JPH0766614B2 (en) 1995-07-19

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term