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RECORDING SECTION
4.7
Toner Cartridge
Fig. 4-56 shows the structure of the toner cartridge. This toner cartridge
contains the primary charging roller, photosensitive drum and developing
cylinder.
Next, let's describe the types of toner cartridges and toner detection meth-
ods used in facsimile products.
• Antenna sensor method
The developing cylinder and antenna sensor are electrostatically joined.
When a voltage is applied to the developing cylinder, a voltage is also gen-
erated to the antenna sensor. The voltage generated to the antenna sensor
changes according to the amount of toner. Toner is judged to be absent
when the amount of toner falls and the output voltage of the antenna sensor
falls below a certain stipulated value.
• LED method
Light is irradiated on a photo-transistor on the outside of the cartridge from
the LED under the cartridge. Toner is judged to be absent when the output
voltage of the photo-transistor falls below a certain stipulated value.
4–46
Cleaner blade
Waste toner
container
Fig. 4-56 Structure of Toner Cartridge
Cartridge Type
FX-V/FX-VII
Antenna sensor method
FX-1/FX-2
LED method
FX-3/FX-4
Magnetic sensor method
Primary charging roller
Photosensitive drum
Toner Detection Method
Toner container
Blade
Developing cylinder
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