JP2005181991A5 - - Google Patents

Claims (11)

In an electrophotographic apparatus having an electrophotographic photosensitive member, a charging unit, an exposing unit, a developing unit, a transferring unit, and a neutralizing unit, the exposing unit has a semiconductor laser, and the neutralizing unit has an LED. The wavelength (λa [nm]), the wavelength of the LED (λb [nm]), and the wavelength at the maximum spectral sensitivity of the electrophotographic photosensitive member (λc [nm]) satisfy the following formula (1): And λa, λb, and λc are all in the range of 380 nm to 520 nm:
λa <λc <λb (1) The sensitivity of the photoreceptor in the λa [nm] (Sa [V · m 2 / cJ]), the sensitivity of the photoreceptor in the λb [nm] (Sb [V · m 2 / cJ]) and although the following formula ( The electrophotographic apparatus according to claim 1, wherein 3) is satisfied:
Sb / Sa ≧ 1.0 5 ··· ( 3). 3. The electrophotographic apparatus according to claim 1, wherein the electrophotographic photoreceptor is an organic photoreceptor. The organic photoreceptor of the photosensitive layer is a charge generation material as a following formula (4) an electrophotographic apparatus according to claim 3, characterized in that it contains an azo compound of:
Cp1-N = N-Ar-N = N-Cp2 (4)
(In the formula, Ar an aromatic hydrocarbon ring which may have a substituent, which may have a substituent heterocycle or they bound directly or aromatic group or non-aromatic group Cp1 and Cp2 represent coupler residues having the same or different phenolic hydroxyl groups, except that the above Cp1-N═N— and —N═N—Cp2 are bonded to the same benzene ring). The organic photoreceptor of the photosensitive layer the following structural formula (5) The electrophotographic apparatus according to claim 3, wherein the containing porphyrin compound as the charge generating material:

(In the formula, M represents a metal that may have a hydrogen atom or an axial ligand, and R _{11 to} R ₁₈ each independently represents a hydrogen atom, an alkyl group that may have a substituent, An aromatic ring which may have a substituent, an amino group which may have a substituent, a sulfur atom which may have a substituent, an alkoxy group, a halogen atom, a nitro group or a cyano group, A ₁₁ to A ₁₄ each independently represents a hydrogen atom, an alkyl group which may have a substituent, an aromatic ring which may have a substituent or a heterocyclic ring which may have a substituent, provided that at least One represents an optionally substituted heterocyclic ring). The structural formula (4) is an electrophotographic apparatus according to claim 4, characterized by being represented by the following structural formula (6):

(In the formula, R ₁ and R ₂ each independently represent an alkyl group which may have a substituent, an aryl group which may have a substituent, or a halogen atom, and m ₁ and m ₂ are 0. Represents an integer of -4, and Cp1 and Cp2 represent coupler residues having the same or different phenolic hydroxyl groups). The electrophotographic apparatus according to claim 4, wherein at least one of Cp1 and Cp2 in the structural formula (4) is the following structural formula (7) or (8):

(In the above formulas (7) and (8), R ₃ and R ₄ are each independently a hydrogen atom, an alkyl group that may have a substituent, an aryl group that may have a substituent, or a substituent. Represents a heterocyclic group which may have a group, R ₃ and R ₄ may form a cyclic amino group via a nitrogen atom in the formula, Z represents an oxygen atom or a sulfur atom, and n Represents 0 or 1, and Y represents a divalent aromatic hydrocarbon ring group which may have a substituent or a divalent nitrogen-containing heterocyclic group which may have a substituent. The electrophotographic apparatus according to claim 4, wherein the structural formula (4) is the following structural formula (6), and at least one of Cp1 and Cp2 is the structural formula (7) or (8).

(In the above formula (6), R ₁ and R ₂ each independently represents an alkyl group which may have a substituent, an aryl group which may have a substituent, or a halogen atom, and m ₁ and m ₂ represents an integer of 0 to 4). In the compound represented by the structural formula (5), R _{11 to} R ₁₈ in the structural formula (5) are all hydrogen atoms, and A _{11 to} A ₁₄ are all pyridyl groups. The electrophotographic apparatus according to claim 5 , wherein the electrophotographic apparatus is a 20-tetrapyridyl-21H, 23H-porphyrin compound. The 5,10,15,20-tetrapyridyl-21H, 23H-porphyrin compound has a Bragg angle (2θ ± 0.2 °) of 8.2 °, 19.7 °, 20.8 in CuKα characteristic X-ray diffraction. 10. The electrophotographic apparatus according to claim 9 , wherein the electrophotographic apparatus is a crystal form of 5,10,15,20-tetra (4-pyridyl) -21H, 23H-porphyrin crystal having peaks at .degree. And 25.9.degree. The charge-eliminating unit, an electrophotographic apparatus according to claim 1 or 2, characterized in that it is arranged so the pre-charge exposure, or pre-cleaning exposure light performed.