JPS5657963A - Surface electrometer - Google Patents

Surface electrometer

Info

Publication number
JPS5657963A
JPS5657963A JP13341079A JP13341079A JPS5657963A JP S5657963 A JPS5657963 A JP S5657963A JP 13341079 A JP13341079 A JP 13341079A JP 13341079 A JP13341079 A JP 13341079A JP S5657963 A JPS5657963 A JP S5657963A
Authority
JP
Japan
Prior art keywords
measuring
measured
photosensitive drum
shielding member
measuring 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
JP13341079A
Other languages
Japanese (ja)
Inventor
Hiroshi Ogawa
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP13341079A priority Critical patent/JPS5657963A/en
Publication of JPS5657963A publication Critical patent/JPS5657963A/en
Pending legal-status Critical Current

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  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE: To make construction simple and middle-sized by specifying the disposition of a shielding member and a measuring electrode.
CONSTITUTION: A shielding member 102 having a measuring window 102 for measuring potential in the position opposing to the part to be measured of a photosensitive drum 47 is fixed to the bent parts 101a, 101b of a base bed 101 by means of a screw 112 and a printed substrate 109 having a measuring electrode 110 is so fixed by means of a screw 111 as to closely contact the bent inner side face of the bent part 101a. Further, a chopper electrode 108 is disposed at the center of the plate thickness of the base bed 101. As a result, the printed substrates 109 each having the shielding member 102 and the measuring electrode 110 are mounted on both sides respectively of the pltelike base bed 101, whereby the construction of a surface electrometer 67 is made simple and small. In addition, the surface potential of the photosensitive drum 47 is measured and controlled by intermittently shielding the electric field between the surface to be measured of the photosensitive drum 47 and the measuring electrode 110 by making use of the continuous vibrations of a tuning fork 103 and obtaining the AC current on the measuring device 110.
COPYRIGHT: (C)1981,JPO&Japio
JP13341079A 1979-10-16 1979-10-16 Surface electrometer Pending JPS5657963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13341079A JPS5657963A (en) 1979-10-16 1979-10-16 Surface electrometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13341079A JPS5657963A (en) 1979-10-16 1979-10-16 Surface electrometer

Publications (1)

Publication Number Publication Date
JPS5657963A true JPS5657963A (en) 1981-05-20

Family

ID=15104105

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13341079A Pending JPS5657963A (en) 1979-10-16 1979-10-16 Surface electrometer

Country Status (1)

Country Link
JP (1) JPS5657963A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03296073A (en) * 1990-04-16 1991-12-26 Hitachi Ltd Electrostatic charging recording device and electrostatically charged latent image measuring device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03296073A (en) * 1990-04-16 1991-12-26 Hitachi Ltd Electrostatic charging recording device and electrostatically charged latent image measuring device

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