| 摘要 |
<p>PROBLEM TO BE SOLVED: To miniaturize an electrophotographic device and save the space without having a limitation resulted from image quality by containing a toner particle having an apparent viscosity of a specified value or less, a magnetic particle having a magnetic force of a specified value or less and a positive charging particle. SOLUTION: The apparent viscosity at 130 deg.C of toner particle is set to 2×10<5> poise or less. According to such a range, a low energy fixed toner can be obtained. On the other hand, the apparent viscosity higher than this range can not conform to low energy fixation, and it is not preferred. On this developer, a magnetic particle in which the magnetic force in a measuring magnetic field of 2KOe is 85emu/g or less and a positive charging particle are laid. As the magnetic particle, a material represented by [(MnO)x (ZnO)y (FeO)1-x-y ].Fe2 O3 is desirably used. In the formula, (x), (y) represent molar fraction, wherein (x) is 0.01-0.3, and (y) is 0.01-0.3.</p> |
