Image forming device and process cartridge
An image forming device includes an image holding member, a charging device configured to charge a surface of the image holding member, an electrostatic charge image forming device configured to form an electrostatic charge image on the surface of the image holding member that has been charged, a developing device configured to contain a developer containing toner, supply the developer, and develop the electrostatic charge image formed on the surface of the image holding member into a toner image, a transfer device configured to transfer the toner image formed on the surface of the image holding member onto a surface of a recording medium, a cleaning device including a cleaning blade configured to clean the surface of the image holding member, and a fixing device configured to fix the toner image on the surface of the recording medium, in which the cleaning blade recovers a recovered toner containing toner particles and metal titanate particles, and the metal titanate particles exhibit a particle size distribution curve satisfying Expression (1), Expression (1). 1.4≤2b/(a+b)≤1.95, where a is a width on a smaller diameter side with respect to a perpendicular line at a 50% height of a maximum peak height, the perpendicular line being drawn from a maximum peak of the particle size distribution curve, and b is a width on a larger diameter side with respect to the perpendicular line at the 50% height of the maximum peak height.
1 . An image forming device comprising:
an image holding member;
a charging device configured to charge a surface of the image holding member;
an electrostatic charge image forming device configured to form an electrostatic charge image on the surface of the image holding member that has been charged;
a developing device configured to contain a developer containing toner, supply the developer, and develop the electrostatic charge image formed on the surface of the image holding member into a toner image;
a transfer device configured to transfer the toner image formed on the surface of the image holding member onto a surface of a recording medium;
a cleaning device including a cleaning blade configured to clean the surface of the image holding member; and
a fixing device configured to fix the toner image on the surface of the recording medium,
wherein the cleaning blade recovers a recovered toner containing toner particles and metal titanate particles, and
the metal titanate particles exhibit a particle size distribution curve satisfying Expression (1),
1.4
≤
2
b
/
(
a
+
b
)
≤
1.95
Expression
(
1
)
where a is a width on a smaller diameter side with respect to a perpendicular line at a 50% height of a maximum peak height, the perpendicular line being drawn from a maximum peak of the particle size distribution curve, and b is a width on a larger diameter side with respect to the perpendicular line at the 50% height of the maximum peak height.
2 . The image forming device according to claim 1 , wherein the particle size distribution curve of the metal titanate particles satisfies Expression (2),
1.6
≤
2
b
/
(
a
+
b
)
≤
1.9
Expression
(
2
)
where a is the width on the smaller diameter side with respect to the perpendicular line at the 50% height of the maximum peak height, the perpendicular line being drawn from the maximum peak of the particle size distribution curve, and b is the width on the larger diameter side with respect to the perpendicular line at the 50% height of the maximum peak height.
3 . The image forming device according to claim 1 , wherein
the width b in the particle size distribution curve of the metal titanate particles is 0.5 μm or more and 2.0 μm or less, and
the maximum peak height of the particle size distribution curve of the metal titanate particles is 5% or more and 40% or less.
4 . The image forming device according to claim 3 , wherein
the width b in the particle size distribution curve of the metal titanate particles is 0.75 μm or more and 1.5 μm or less, and
the maximum peak height in the particle size distribution curve of the metal titanate particles is 10% or more and 25% or less.
5 . The image forming device according to claim 1 , wherein the metal titanate particles have a particle diameter of 0.5 μm or more and 3.0 μm or less at the maximum peak in the particle size distribution curve.
6 . The image forming device according to claim 5 , wherein the particle diameter at the maximum peak in the particle size distribution curve of the metal titanate particles is 0.75 μm or more and 2.0 μm or less.
7 . The image forming device according to claim 1 , wherein the metal titanate particles have an average circularity of 0.75 or more and 1.0 or less.
8 . The image forming device according to claim 1 , wherein in the recovered toner, a number ratio of the metal titanate particles to the toner particles is 0.3 number % or more and 3.5 number % or less.
9 . The image forming device according to claim 1 , wherein the metal titanate particles are strontium titanate particles.
10 . The image forming device according to claim 9 , wherein the strontium titanate particles contain a dopant.
11 . The image forming device according to claim 10 , wherein the dopant is silica or lanthanum.
12 . A process cartridge attachable to and detachable from an image forming device, the process cartridge comprising:
an image holding member;
a charging device configured to charge a surface of the image holding member;
an electrostatic charge image forming device configured to form an electrostatic charge image on the surface of the image holding member that has been charged;
a developing device configured to contain a developer containing toner, supply the developer, and develop the electrostatic charge image formed on the surface of the image holding member into a toner image; and
a cleaning device including a cleaning blade configured to clean the surface of the image holding member,
wherein the cleaning blade recovers a recovered toner containing toner particles and metal titanate particles, and
the metal titanate particles exhibit a particle size distribution curve satisfying Expression (1),
1.4
≤
2
b
/
(
a
+
b
)
≤
1.95
Expression
(
1
)
where a is a width on a smaller diameter side with respect to a perpendicular line at a 50% height of a maximum peak height, the perpendicular line being drawn from a maximum peak of the particle size distribution curve, and b is a width on a larger diameter side with respect to the perpendicular line at the 50% height of the maximum peak height.