| 摘要 |
A duty ratio Du (%), denoted by (T2/(T1+T2))×100, is in the range of 60≦̸Du≦̸80; a magnetic carrier has a resistivity &rgr; which decreases in accordance with an increasing electric field strength, and a relative dielectric constant ∈ which increases in accordance with an increasing electric field strength; a product of a time constant ∈0∈&rgr;(s) of electric charge decay in an electric field strength E2D decided by a second peak voltage V2 and a dark potential VD, and an electric field strength E2D satisfies a relation of 20≦̸∈0∈&rgr; E2D (s·V/cm); and a time constant ∈0∈&rgr;(s) and a relative dielectric constant ∈ in an electric field strength E1L, which is decided by a first peak voltage V1 and a bright potential VL, satisfy the following relations: ∈0∈&rgr;(s)≦̸6.0×10−4, and 30≦̸∈.
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