Surface Potential Sensors Feed-back type EFS series Issue date: • All specifications are subject to change without notice. • Conformity to RoHS Directive: This means that, in conformity with EU Directive 2002/95/EC, lead, cadmium, mercury, hexavalent chromium, and specific bromine-based flame retardants, PBB and PBDE, have not been used, except for exempted applications.

Surface Potential Sensors EFS Series FEEDBACK TYPE At a new price and featuring better than ±0.05V detector output variation noise, this recently developed feedback surface voltage sensor supports the improved image quality of next generation color printers. This voltage sensor is constructed using TDK’s unique, high precision, highly stable detection circuit which feeds the measured photosensitive drum surface potential back to the electrical field density control chopper and probe shield cover. Output of this probe is highly precise and quite stable, almost unaffected by temperature fluctuations...

FEED BACK TYPE ELECTRICAL CHARACTERISTICS Type Measured Power supply Output voltage(Measured voltage range voltage voltage)∗ Ve(V) Vcc(V) V0(V) Rise time tr Fall time tf (ms) (ms) Power consumption current Idc(mA) 100max. 100max. Outputs1/200th the measured voltage. • Temperature range operating : 0 to +50°C storage : –20 to +60°C Humidity range (without wet-bulb) operating : 10 to +90(%)RH storage: 5 to 95(%)RH Maximum humidity temperature : 38°C (without wet-bulb) MEASURING CIRCUIT DETERMINATION OF RESPONSE TIME Output voltage High voltage DC power supply Electrode OUTPUT VOLTAGE vs. DETECTOR...

FEEDBACK TYPE EXAMPLE OF OPERATION Tuning fork oscillating shutter Sensor electrode Shield case High voltage boost (isolated transformer) Synchronized waveform Voltage divider Buffer Sensor voltage feedback Voltage element drive circuit To various circuits Integrating circuit Floating type power supply Floating components At a fixed distance from the measured surface, a positive charge is induced on the probe’s internal sensor electrode surface through the air by an corresponding static charge on the measured surface. The chopper (tuning fork oscillator type shutter) is made to oscillate during...