US 8,298,733 B2Granted

Electrophotographic photosensitive member

AssigneeFuji Electric Co., Ltd.

InventorMotohiro Takeshima

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Abstract

In an electrophotographic apparatus (e.g., a photocopier or laser printer), an electrophotographic photosensitive member (image-forming part) has a metal substrate roughened on its surface, a metal oxide-containing undercoat layer on the substrate, and an organic photosensitive layer over the undercoat. A coherent light source (e.g., laser) can cause interference fringes that degrade the printed image. Interference fringes are judged (or predicted) as follows: The surface reflectance is measured at intervals over the spectral width of the light source. The measured surface reflectance is corrected, using a mirror-surface conductive substrate as a reference, to obtain a reflectance of the photosensitive member. The reflectance is subjected to a discrete Fourier transformation, which generates a power spectrum, over the spectral width of the light source, from the reflectance as a function of the wavelength. Interference fringes are judged from the maximum peak value in the power spectrum, as compared to a predetermined value.

Claims9

Dependent claims

An electrophotographic photosensitive member, that is mountable in an electrophotographic apparatus including a coherent exposure light source, comprising:

a conductive substrate having a roughened surface which is roughened by a sand blasting process to provide a sand-blast-roughened surface;
a metal oxide-containing undercoat layer coated on the sand-blast-roughened surface and having a film thickness d within a range of 1.5 μm≦d≦3.5 μm;
and
an organic photosensitive layer coated on the metal oxide-containing undercoat layer;
wherein the electrophotographic photosensitive member satisfies a condition Sp≦10, and Sp is determined by
(a) measuring a surface reflectance of coherent light from the electrophotographic photosensitive member at a plurality of predetermined wavelength intervals of width Δλ within a wavelength range of 750 nm≦λ≦812 nm to obtain a measured surface reflectance;
(b) correcting the measured surface reflectance to obtain a corrected reflectance Iopc of the electrophotographic photosensitive member, by taking a mirror-surface conductive substrate reflectance as a reference, and subjecting the corrected reflectance to a discrete Fourier transformation according to a following equation (1) and calculating, from a result of the equation (1), a power spectrum |S(n/(N·Δλ)|2 according to a following equation (2)
S
⁡
(
n
N
·
Δ
⁢
⁢
λ
)
=
∑
m
=
0
N
-
1
⁢
I
OPC
⁡
(
m
·
Δ
⁢
⁢
λ
)
⁢
exp
⁡
(
-
ⅈ2π
·
n
N
·
Δ
⁢
⁢
λ
·
m
·
Δ
⁢
⁢
λ
)
=
a
+
bi
(
1
)
wherein i represents √−1, n and m represent integers, and N represents N=2s (s=1, 2, . . . , u);

S
⁡
(
n
N
·
Δλ
)

2
=
a
2
+
b
2
;
(
2
)
and
(c) determining a peak value of the power spectrum |S(n/(N·Δλ))|2 within a frequency range of 0<n/(N·Δλ(Hz)≦2.5×108;
and
(d) setting the peak value of the power spectrum |S(n/(N·Δλ))|2 equal to Sp.

90 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/985,012Filed 10 Nov 2004
Priority: JP 2003-38029310 Nov 2003
Published: US 2005/0118520 A12 Jun 2005
Granted: 30 Oct 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G03G 5/104
Bases for charge-receiving or other layers: comprising inorganic material other than metals, e.g. salts, oxides, carbon
G03G 5/10
Recording-members for original recording by exposure, e.g. to light, to heat or to electrons; Manufacture thereof; Selection of materials…
G03G 5/144
Inert intermediate layers: comprising inorganic material
G03G
Electrography