[go: up one dir, main page]

JPS54107782A - Ac type surface electrometer making use of fan - Google Patents

Ac type surface electrometer making use of fan

Info

Publication number
JPS54107782A
JPS54107782A JP1479378A JP1479378A JPS54107782A JP S54107782 A JPS54107782 A JP S54107782A JP 1479378 A JP1479378 A JP 1479378A JP 1479378 A JP1479378 A JP 1479378A JP S54107782 A JPS54107782 A JP S54107782A
Authority
JP
Japan
Prior art keywords
fan
surface potentials
detected
air flow
aperture
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
JP1479378A
Other languages
Japanese (ja)
Other versions
JPS6115372B2 (en
Inventor
Minoru Aoki
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP1479378A priority Critical patent/JPS54107782A/en
Publication of JPS54107782A publication Critical patent/JPS54107782A/en
Publication of JPS6115372B2 publication Critical patent/JPS6115372B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Measurement Of Current Or Voltage (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)

Abstract

PURPOSE: To provide a miniature apparatus of simple constitution by turning a conductor fan by making use of air flow for dustproofing thereby varying the electrostatic fields owing to surface potentials.
CONSTITUTION: The inside of a shield case 1 and the neighborhood of an aperture 2 are dustproofed from the outside by the air flow through influent port 3 and aperture 2. This air flow causes the fan 9 formed by blades of conductor to turn to vary the electrostatic fields corresponding to the surface potentials of the measuring object 8. The surface potentials of the object 8 are then detected as AC signals by a detecting electrode 6 opposing to the surface of the object 8 via aperture 2 and a detector 7. On the other hand, the number of revolutions of the fan 9 is detected with a light source 10 and photo detector 11 and is applied to a differential amplifier 110 to which the detected AC voltage of the device 7 apply via frequency- voltage coverter 100. The amplifier 110 generated the AC signal of a constant voltage proportional to the surface potentials of the object 8 irrespective of the number of revolutions of the fan 9. Hence, the need for the motor exclusive for the fan is eliminated.
COPYRIGHT: (C)1979,JPO&Japio
JP1479378A 1978-02-10 1978-02-10 Ac type surface electrometer making use of fan Granted JPS54107782A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1479378A JPS54107782A (en) 1978-02-10 1978-02-10 Ac type surface electrometer making use of fan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1479378A JPS54107782A (en) 1978-02-10 1978-02-10 Ac type surface electrometer making use of fan

Publications (2)

Publication Number Publication Date
JPS54107782A true JPS54107782A (en) 1979-08-23
JPS6115372B2 JPS6115372B2 (en) 1986-04-23

Family

ID=11870922

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1479378A Granted JPS54107782A (en) 1978-02-10 1978-02-10 Ac type surface electrometer making use of fan

Country Status (1)

Country Link
JP (1) JPS54107782A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6329263A (en) * 1986-07-23 1988-02-06 Saginomiya Seisakusho Inc DC electric field measuring device
JP2002228635A (en) * 2001-01-30 2002-08-14 Mit:Kk Suction type ion-measuring device
JP2007218693A (en) * 2006-02-15 2007-08-30 Canon Inc Measuring device and image forming apparatus
JP2020060529A (en) * 2018-10-12 2020-04-16 春日電機株式会社 Static electricity measuring device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6414270U (en) * 1987-07-15 1989-01-25

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6329263A (en) * 1986-07-23 1988-02-06 Saginomiya Seisakusho Inc DC electric field measuring device
JP2002228635A (en) * 2001-01-30 2002-08-14 Mit:Kk Suction type ion-measuring device
JP2007218693A (en) * 2006-02-15 2007-08-30 Canon Inc Measuring device and image forming apparatus
JP2020060529A (en) * 2018-10-12 2020-04-16 春日電機株式会社 Static electricity measuring device

Also Published As

Publication number Publication date
JPS6115372B2 (en) 1986-04-23

Similar Documents

Publication Publication Date Title
GB666786A (en) Improvements in and relating to thickness gauges
JPS54107782A (en) Ac type surface electrometer making use of fan
SE7905797L (en) DEVICE FOR DETECTION OF LIQUID CURRENTS
ES444659A1 (en) Method and apparatus for discriminating against extraneous particles in optical testing
US4121456A (en) Meter for the flow rate or the speed of a gas stream
JPS5437760A (en) Photoreceptor surface potential detector
JPS5476186A (en) Voltage detector
GB1295854A (en)
JPS5533169A (en) Electrostatic recorder
JPS554577A (en) Electrometer
JPS55144557A (en) Surface potentiometer
JPS5368290A (en) Insulation resistance measuring apparatus of ground system
JPS5552964A (en) Surface potentiometer
JPS5242728A (en) Auto bias development process for the electro-photographic copying mac hine
JPS55146052A (en) Noise reduction circuit in noncontact type potentiometer
JPS57154268A (en) Detector for remaining amount of developer
SU146547A1 (en) Device for measuring and recording the conductivity of air in the atmosphere
JPS524743A (en) Detector circuit for magnetic bubble device
JPS5467473A (en) Surface potentiometer
SU1405806A1 (en) Apparatus for determining concentration of aeroions
JPS56147645A (en) Air cleaner
SU529507A1 (en) Aeroion counter
JPS5552965A (en) Surface potentiometer
JPS554578A (en) Electrometer
JPS5312371A (en) Mehtod and apparatus for examination of current meter