JPS55433A - Rotational phase detector - Google Patents

Rotational phase detector

Info

Publication number
JPS55433A
JPS55433A JP7321178A JP7321178A JPS55433A JP S55433 A JPS55433 A JP S55433A JP 7321178 A JP7321178 A JP 7321178A JP 7321178 A JP7321178 A JP 7321178A JP S55433 A JPS55433 A JP S55433A
Authority
JP
Japan
Prior art keywords
rotational phase
phase detector
apertures
detecting
thin
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
JP7321178A
Other languages
Japanese (ja)
Inventor
Kenji Sato
Saburo Kazama
Isao Fukushima
Masayuki Fujisaki
Hideo Nishijima
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 JP7321178A priority Critical patent/JPS55433A/en
Publication of JPS55433A publication Critical patent/JPS55433A/en
Pending legal-status Critical Current

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  • Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)

Abstract

PURPOSE: To reduce the size of a rotational phase detector by using a rotor magnet as a tachmagnet and by making a detecting element thin.
CONSTITUTION: A plate 18, which is placed in contact with a rotor magnet 15 and which is made of a highly magnetically permeable material such as iron, is formed with first and second apertures 19 and 20. The magnetic flux density of the magnet 15, which leaks through the apertures 19 and 20, is detected to detect the rotational positions of video heads 4 and 5. A thin Hall element 21 is used as a magneticism detecting element. Thus, the techmagnet for detecting the rotational phase can be dispensed with to attain the cost reducing purpose so that the Hall element 24 can be mounted in a lower stationary cylinder 6. Thus, the mounting cost can be reduced while eliminating the requirement for the spare space.
COPYRIGHT: (C)1980,JPO&Japio
JP7321178A 1978-06-19 1978-06-19 Rotational phase detector Pending JPS55433A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7321178A JPS55433A (en) 1978-06-19 1978-06-19 Rotational phase detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7321178A JPS55433A (en) 1978-06-19 1978-06-19 Rotational phase detector

Publications (1)

Publication Number Publication Date
JPS55433A true JPS55433A (en) 1980-01-05

Family

ID=13511589

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7321178A Pending JPS55433A (en) 1978-06-19 1978-06-19 Rotational phase detector

Country Status (1)

Country Link
JP (1) JPS55433A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5834052U (en) * 1981-08-31 1983-03-05 スズキ株式会社 Rotation detection device in electric motor
JPS5842756U (en) * 1981-09-18 1983-03-22 日本ビクター株式会社 rotation detection device
JPH0526557U (en) * 1991-09-21 1993-04-06 有限会社関車輛工業 Roof opening / closing device for van type vehicles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5834052U (en) * 1981-08-31 1983-03-05 スズキ株式会社 Rotation detection device in electric motor
JPS5842756U (en) * 1981-09-18 1983-03-22 日本ビクター株式会社 rotation detection device
JPH0526557U (en) * 1991-09-21 1993-04-06 有限会社関車輛工業 Roof opening / closing device for van type vehicles

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