Developer holding body and developing apparatus
View Patent ↗In order to obtain the surface shape which is uniform in each of the circumferential direction and the axial direction without being deviated in one direction on the surface, a developer holding body is provided which is arranged so as to face an image holding body, holds a developer as a layer onto a roughened surface, and supplies the developer in order to develop an image which is formed on the image holding body, and wherein the roughening is executed on the basis of a ratio of cutting depths in a plurality of directions.
1. A developer holding body which is arranged so as to face an image holding body, holds a developer as a layer onto a roughened surface, and supplies said developer in order to develop an image which is formed on said image holding body, wherein said roughening is executed on the basis of a ratio of cutting depths in a plurality of directions, and wherein the ratio of the cutting depths in said plurality of directions is based on an average of the cutting depths in respective directions at a plurality of load length ratios.
2. The developer holding body according to claim 1 , wherein the ratio of the cutting depths in said plurality of directions lies within a range from 0.85 or more to 1.18 or less, serving as a rough surface range.
3. The developer holding body according to claim 2 , wherein said developer holding body is rotated and said rough surface range isnarrowed as a speed of said rotation rises.
4. The developer holding body according to claim 2 , wherein a value of said rough surface range is narrowed as a volume mean grain diameter of the developer which is used increases.
5. The developer holding body according to claim 1 , wherein said roughening is executed under conditions that the ratio of the cutting depths in said plurality of directions lies within a range from 0.79 or more to 1.26 or less, serving as a rough surface range, (5 μm≦10-point average roughness Rz 1 in the circumferential direction≦10 μm), and (5 μm≦10-point average roughness Rz 2 in the axial direction≦10 μm).
6. A developer holding body which is arranged so as to face an image holding body, holds a developer as a layer onto a roughened surface, and supplies said developer in order to develop an image which is formed on said image holding body,
wherein assuming that a cutting depth at the time when a load length ratio in the circumferential direction of the surface of said developer holding body is equal to n % is set to C 1vn [μm] and a cutting depth at the time when a load length ratio in the axial direction of said surface is equal to n % is set to C 2vn [μm], a relational expression
0.85
≤
∑
n
=
m
1
m
2
C
1
vn
C
2
nv
k
≤
1.18
where, n, m 1 , m 2 : real numbers (0<m 1 ≦m 2 ≦100)
k: the number of n
is satisfied.
7. The developer holding body according to claim 6 , wherein in a ratio of the cutting depth in the circumferential direction of the surface to the cutting depth in the axial direction of the surface which is shown by C 1vn /C 2vn shown by said relational expression,
a value of n % of each of the load length ratio in the circumferential direction of the surface and the load length ratio in the axial direction of the surface is equal to a value of one of (n=10, 20, 30, 40, 50, 60, 70, 80, 90).
8. A developer holding body which is arranged so as to face an image holding body, holds a developer as a layer onto a roughened surface, and supplies said developer in order to develop an image which is formed on said image holding body,
wherein assuming that a cutting depth at the time when a load length ratio in the circumferential direction of the surface of said developer holding body is equal to n % is set to C 1vn [μm], a cutting depth at the time when a load length ratio in the axial direction of said surface is equal to n % is set to C 2vn [μm], a 10-point average roughness in the circumferential direction of the surface of said developer holding body is set to Rz 1 , and a 10-point average roughness in the axial direction of the surface is set to Rz 2 , respectively, relational expressions
0.79
≤
∑
n
=
m
1
m
2
C
1
vn
C
2
nv
k
≤
1.26
5 μm≦Rz1≦10 μm, and
5 μm≦Rz2≦10 μm
where, n, m 1 , m 2 : real numbers (0<m 1 ≦m 2 ≦100)
k: the number of n
are satisfied.
9. The developer holding body according to claim 8 , wherein in a ratio of the cutting depth in the circumferential direction of the surface to the cutting depth in the axial direction of the surface which is shown by C 1vn /C 2vn shown by said relational expression,
a value of n % of each of the load length ratio in the circumferential direction of the surface and the load length ratio in the axial direction of the surface is equal to a value of one of (n=10, 20, 30, 40, 50, 60, 70, 80, 90).
10. A developing apparatus having a developer holding body which is arranged so as to face an image holding body, holds a developer as a layer onto a roughened surface, and supplies said developer in order to develop an image which is formed on said image holding body, wherein said roughening is executed on the basis of a ratio of cutting depths in a plurality of directions, and wherein the ratio of the cutting depths in said plurality of directions is based on an average of the cutting depths in respective directions at a plurality of load length ratios.
11. The developing apparatus according to claim 10 , wherein the ratio of the cutting depths in said plurality of directions lies within a range from 0.85 or more to 1.18 or less, serving as a rough surface range.
12. The developing apparatus according to claim 11 , wherein said developer holding body is rotated and said rough surface range is narrowed as a speed of said rotation rises.
13. The developing apparatus according to claim 11 , wherein a value of said rough surface range is narrowed as a volume mean grain diameter of the developer which is used increases.
14. The developing apparatus according to claim 10 , wherein said roughening is executed under conditions that the ratio of the cutting depths in said plurality of directions lies within a range from 0.79 or more to 1.26 or less, serving as a rough surface range, (5 μm≦10-point average roughness Rz 1 in the circumferential direction ≦10 μm), and (5 μm≦10-point average roughness Rz 2 in the axial direction ≦10 μm).
15. A developing apparatus which is arranged so as to face an image holding body, holds a developer as a layer onto a roughened surface, and supplies said developer in order to develop an image which is formed on said image holding body,
wherein assuming that a cutting depth at the time when a load length ratio in the circumferential direction of the surface of said developer holding body is equal to n % is set to C 1vn [μm] and a cutting depth at the time when a load length ratio in the axial direction of said surface is equal to n % is set to C 2vn [μm], a relational expression
0.85
≤
∑
n
=
m
1
m
2
C
1
vn
C
2
nv
k
≤
1.18
where, n, m 1 , m 2 : real numbers (0<m 1 ≦m 2 ≦100)
k: the number of n
is satisfied.
16. The developing apparatus according to claim 15 ,
wherein in a ratio of the cutting depth in the circumferential direction of the surface to the cutting depth in the axial direction of the surface which is shown by C 1vn /C 2vn shown by said relational expression,
a value of n % of each of the load length ratio in the circumferential direction of the surface to the load length ratio in the axial direction of the surface is equal to a value of one of (n=10, 20, 30, 40, 50, 60, 70, 80, 90).
17. A developing apparatus which is arranged so as to face an image holding body, holds a developer as a layer onto a roughened surface, and supplies said developer in order to develop an image which is formed on said image holding body,
wherein assuming that a cutting depth at the time when a load length ratio in the circumferential direction of the surface of said developer holding body is equal to n % is set to C 1vn [μm], a cutting depth at the time when a load length ratio in the axial direction of said surface is equal to n % is set to C 2vn [μm], a 10-point average roughness in the circumferential direction of the surface of said developer holding body is set to Rz 1 , and a 10-point average roughness in the axial direction of the surface is set to Rz 2 , respectively, relational expressions
0.79
≤
∑
n
=
m
1
m
2
C
1
vn
C
2
nv
k
≤
1.26
5 μm≦Rz1≦10 μm, and
5 μm≦Rz2≦10 μm
where, n, m 1 , m 2 : real numbers (0≦m 1 ≦m 2 ≦100)
k: the number of n
are satisfied.
18. The developing apparatus according to claim 17 ,
wherein in a ratio of the cutting depth in the circumferential direction of the surface to the cutting depth in the axial direction of the surface which is shown by C 1vn /C 2vn shown by said relational expression,
a value of n % of each of the load length ratio in the circumferential direction of the surface to the load length ratio in the axial direction of the surface is equal to a value of one of (n=10, 20, 30, 40, 50, 60, 70, 80, 90).