Electricity: measuring and testing – Using ionization effects – For analysis of gas – vapor – or particles of matter
Reexamination Certificate
1999-03-25
2001-05-01
Metjahic, Safet (Department: 2858)
Electricity: measuring and testing
Using ionization effects
For analysis of gas, vapor, or particles of matter
Reexamination Certificate
active
06225809
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 10-106,793, filed Apr. 16, 1998, entitled “Static Electricity Measuring Apparatus.” The contents of that application are incorporated herein by reference in their entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a static electricity measuring system.
2. Description of the Related Art
Static electricity measuring apparatuses are disclosed in Japanese Unexamined Patent Publication (Kokai) 5-126,883 (hereinafter referred to as the “'883 publication”), entitled “Correcting Apparatus For Powder Electric Charge Measuring Device”; and Japanese Examined Patent Publication (Kokoku) 7-1,291 (hereinafter referred to as the “'291 publication”), entitled “Apparatus For Detecting Electric Potential Of Charged Powder And Apparatus For Controlling Charging.” The contents of these applications are incorporated herein by reference in their entirety.
The '883 publication discloses a correcting apparatus for correcting a measuring error in a measuring device when electric charge of conductive powder for a copying machine is measured. In this apparatus, the amount of electric charge of the toner is measured by a suction type Faraday cage when the voltage is applied to the toner. The measured value is corrected by comparing the measured value with a reference value of a reference Faraday cage.
In this apparatus, however, toner sample is removed from the copying machine and subsequently the amount of electric charge of the toner is measured. Thus, the amount of electric charge of the toner cannot be measured in the copying machine in real time.
The '291 publication discloses an apparatus for detecting electric potential of charged powder flowing in a fluid dryer. In this apparatus, an electric potential detecting unit is attached to an outer side wall of the dryer. The detecting unit detects the electric potential through a detecting hole which faces a window provided in the outer side wall of the dryer. In order to prevent the flowing powder from entering the inside of the detecting unit through the detecting hole, air is supplied between the window and the detecting hole to form an air layer therebetween which serves as a barrier.
In this apparatus, however, the entrance of the powder to the detecting unit. is not effectively prevented. Accordingly, the apparatus does not precisely detect electric potential of the charged flowing powder.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a static electricity measuring system which precisely detects static electricity of powder, solvent, gas or the like without sampling them.
This object is achieved according to the present invention by providing a static electricity measuring system which includes a probe, a measuring device and a calibration device. The probe includes a sensor which detects an electric field and outputs signals representing the detected electric field. The measuring device measures static electricity on the basis of the signals output from the sensor. The calibration device generates a reference electric field. The measuring device is adjusted when the sensor detects the reference electric field produced by the calibration device.
REFERENCES:
patent: 4139813 (1979-02-01), Shaffer
patent: 5-126883 (1993-05-01), None
patent: 7-1291 (1995-01-01), None
patent: 10-62471 (1998-03-01), None
patent: 10062471 (1998-03-01), None
Watano, Article entitled “The On-line Monitoring of the Electrostatic Field Strength . . .”, Oct., 1997, pp. 778-784.*
Title: “Development of Electrostatic-Field Detecting System for Powder Clouds” by Teruo Suzuki et al, all of Kasuga Denki Inc. Issued in Oct. 1992., pp. 541-544 (with English Abstract).
Title: “A safety Evaluating Test of Electrostatic-Field Sensing System for Powder-Cloud in a Fluidized Drier (I)” by Yasuyuki Tabata et al. Issued in Sep., 1993., pp. 443-446 (with English Abstract).
Title: “Detection of Electrostatic Field Diverged from Charged Cloud Formed by Fluidized Particles” by Yasuyuki Tabata et al. Issued in 1994., pp. 143-152 (with English Abstract).
Title: “Effect of Humidity on Electrostatic Charging on Powders in Pneumatic Transport” by Tsutomu Kodama et al. Issued in Oct. 1995., pp. 221-224 (with English Abstract).
Title: “The On-line Monitoring of the Electrostatic Field Strength in Fluidized Bed Granulation and Drying Using a Newly Developed Electrostatic Field Detecting System” by Satoru Watano et al. Issued Oct. 1997., pp. 778-784 (with English Abstract).
Title: “On-line Monitoring of Electrostatic Field Strength in Powder Pneumatic Transportation Process Using Newly Developed Electrostatic Field Detecting System” by Teruo Suzuki et al. Issued in 1998., pp. 846-855 (with English Abstract).
Kamihashi Katsuyuki
Morikawa Yasuo
Suzuki Kenshi
Suzuki Teruo
Watano Satoru
Kasuga Denki, Inc.
Leroux E P
Metjahic Safet
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
LandOfFree
Static electricity measuring system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Static electricity measuring system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Static electricity measuring system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2562926