Patent ID: 8012659

Claim:
An image forming apparatus, comprising: an image bearing member configured to bear a latent image; a charging device configured to charge a surface of the image bearing member; an irradiating device configured to write an electrostatic latent image on the charged surface of the image bearing member; a developing device configured to develop the electrostatic latent image formed on the surface of the image bearing member with a developer comprising a toner; a transfer device configured to transfer the toner image onto at least one of a transfer member and a recording medium; a cleaning device configured to remove residual toner particles remaining on the surface of the image bearing member; and a fixing device configured to fix the toner image on the recording medium, comprising: a heat roller; and an oil applicator configured to apply a silicone oil to the heat roller, wherein the image forming apparatus has a system speed of from 500 to 1700 mm/sec, and wherein said developing device comprises a developer comprising a toner comprising mother toner particles comprising: a binder resin comprising a crystalline polyester resin and an amorphous polyester resin; a fatty acid amide compound; and a colorant, wherein a ratio (W/R) of a height (W) of a peak at a wavenumber of 1638 cm −1 , specific to the fatty acid amide compound, to a height (R) of a peak at a wavenumber of 829 cm −1 , specific to the amorphous polyester resin, is from 0.010 to 0.040 in an absorption spectrum obtained by an ATR method (total reflectance method) using a Fourier transform infrared (FT-IR) spectrophotometer.