Canon Kabushiki Kaisha

Mikihiro Akasaki

Tadashi Fukuda

Masami Hano

Takeshi Ohtsu

Takashi Kase

Kota Mori

Akinori Miyamoto

Yoshihiro Ogawa

Kazuto Hosoi

Daisuke Tsujimoto

Ryuichiro Matsuo

A toner includes toner particle containing at least a strontium titanate particle on the surface of the toner particle, and the toner is a water-washed toner from which strontium titanate particle desorbable by water washing are removed by water washing. The water-washed toner contains the strontium titanate particle having a number average particle diameter of primary particle (D1) of 10 nm or more and 150 nm or less, and when the distribution of an Sr element in the water-washed toner in the depth direction is determined, (i) the Sr element abundance on the outermost surface x satisfying 0.00&#x3c;x&#x2264;0.80, and (ii) the difference between x and xp 'xp&#x2212;x' satisfying 0.00&#x3c;xp&#x2212;x&#x2264;0.95, where xp is the maximum peak value (atomic %) of the Sr element abundance in the region from the outermost surface to 50 nm.

Toner

An image forming apparatus in which occurrence of an image failure in association with contamination caused by an external additive, such as silica, adhering to a charging unit is suppressed. The image forming apparatus is configured to charge an image bearing member through use of the charging unit, and uses toner having, on a surface thereof, strontium titanate particles and silica particles having predetermined physical properties.

Image forming apparatus

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Matsudo, Japan

Mikihiro Akasaki