Toner

US10877386B2 · kind B2 · utility

Assignee

• Canon Kabushiki Kaisha · JP

Inventors

• Ryuji Murayama · Chiba, JP
• Junichi Tamura · Ichihara, JP
• Kentaro Kamae · Kashiwa, JP
• Hayato Ida · Ibaraki, JP
• Daisuke Yamashita · Kawasaki, JP
• Masaharu Miura · Toride, JP
• Takaho Shibata · Tokyo, JP
• Wakiko Katsumata · Kashiwa, JP
• Yuichi Mizo · Toride, JP

Key dates

• Filing date: Aug 6, 2019
• Grant date: Dec 29, 2020
• Expiry date: Aug 6, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G9/1136
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A toner comprises a toner particle and an external additive, the toner satisfies a certain relationship with regard to σl (C/m2) and σs (C/m2). The toner is divided into two groups i.e. a first group and a second group with inertial classifier, the first group including a larger size of the toner particles, and the second group including a smaller size of the toner particles, and the number of the toner particles in the first group being substantially equal to the number of the toner particles in the second group. Then, al (C/m2) represents an absolute value of average surface charge density of the toner included in the first group, and σs (C/m2) represents an absolute value of average surface charge density of the toner included in the second group.