An optical transmission apparatus employing an FSK scheme is disclosed. The optical transmission apparatus includes a light generator arranged to generate a first tone signal having a first frequency and a second tone signal having a second frequency. The optical transmission apparatus also includes a light modulator including a second modulator for selectively outputting one of the first tone signal and the second tone signal input from the light generator according to input data.

 
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> Developing cartridge, image holding body cartridge, process cartridge and image forming apparatus that are capable of applying a bias voltage to a developing roller without indication of the developing roller
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