发明名称 |
Image forming apparatus and image forming method |
摘要 |
An image forming apparatus having a system speed of from 400 to 1,700 mm/sec, including a latent image bearer; an image developer developing the latent image with two-component developer including a toner and a carrier; a transferer, a toner concentration detector; a toner feeder; and a controller, wherein the toner comprises a release agent and a binder resin including a crystalline polyester resin and an amorphous resin, wherein a ratio (W/R) of a maximum rising peak height (W) of the crystalline polyester resin to a maximum rising peak height (R) of the amorphous resin, which are observed respective infrared absorption spectra when measured by an IR spectroscopy using a Fourier transform infrared spectroanalyzer, is from 0.22 to 0.55. |
申请公布号 |
US8886062(B2) |
申请公布日期 |
2014.11.11 |
申请号 |
US201213468377 |
申请日期 |
2012.05.10 |
申请人 |
Ricoh Company, Ltd. |
发明人 |
Shu Hyo |
分类号 |
G03G15/08;G03G9/087 |
主分类号 |
G03G15/08 |
代理机构 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
代理人 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
主权项 |
1. An image forming apparatus having a system speed of from 400 to 1,700 mm/sec, comprising:
a latent image bearer configured to bear a latent image; an image developer configured to develop the latent image with a two-component developer comprising a toner and a carrier to form a toner image; and a transferer configured to transfer the toner image onto a recording material, wherein the image forming apparatus further comprises: a toner concentration detector configured to detect a toner concentration of the two-component developer in the image developer; a toner feeder configured to feed the toner into the image developer; and a controller configured to control an amount of the toner fed by the toner feeder such that the toner concentration of the two-component developer in the image developer has a target toner concentration, and wherein the toner comprises a release agent and a binder resin comprising a crystalline polyester resin and an amorphous resin, wherein a ratio (W/R) of a maximum rising peak height (W) of the crystalline polyester resin to a maximum rising peak height (R) of the amorphous resin, which are observed respective infrared absorption spectra when measured by an IR spectroscopy (a total reflection method) using a Fourier transform infrared spectroanalyzer, is from 0.22 to 0.55. |
地址 |
Tokyo JP |