Ricoh coretech appendix2 opc
OPCs
(Organic Photoconductors)
RICOH CO., LTD.
October, 1995
Table of Contents
1. OUTLINE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2. COMPOSITION AND FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1. Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2. Function and Material of Each Layer . . . . . . . . . . . . . . . . . . 2-1
3. STYLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1. Drum and Belt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
4. COPY CYCLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1. Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.2. The Steps of the Copy Cycle . . . . . . . . . . . . . . . . . . . . . . . . 4-2
5. OPC CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.1. General Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.2. Special Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.2.1. Deterioration in OPC Thickness . . . . . . . . . . . . . . . . . 5-2
5.2.2. Wavelength of Light. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5.3. Differences between Analog and Digital OPCs . . . . . . . . . . 5-4
6. EFFECTS OF ENVIRONMENTAL FACTORS . . . . . . . . . . . . . . 6-1
6.1. Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.2. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.3. Gases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.4. Dust and Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
October 1st, 1995 OUTLINE
1. OUTLINE
In most copiers or plain paper facsimile machines, a photoconductor transfers
an image of the original to the output of a printer.
Generally, our products use two types of photoconductors. One type is an inorganic photoconductor, made of selenium, that was used in the past for
analog copiers. The other type is an organic photoconductor (OPC) that is
used for analog and digital copiers, plain paper facsimiles, and laser printers.
Recently, all such products use OPCs instead of inorganic photoconductors.
1-1
OPC507.wmf
October 1st, 1995 COMPOSITION AND FUNCTIONS
Composition
2. COMPOSITION AND FUNCTIONS
2.1. Composition
CTL
(Charge Transfer Layer)
(Charge Generation Layer)
CGL
UL
(Under Layer)
10 ~ 30µm
0.1 ~ 1µm
0.2 ~ 10µm
Base Board
OPC500.WMF
An OPC consists of a CTL (Charge Transfer Layer), CGL (Charge Generation
Layer), UL (Under Layer), and a base board.
2.2. Function and Material of Each Layer
Layer Main Function Material
CTL The charge generated in the CGL
is transmitted through this layer to
the surface of the photoconductor.
CGL Generates the charge from the
absorption of light.
UL Prevents positive charges
generated in the CGL from going to
ground.
Base board Develops the counter charge to the
charge developed on the CTL.
2-1
Organic additive
Plastic binder
Azo pigment
Plastic binder
(Analog OPCs have a different
pigment from digital OPCs; see
page 5-3 for more details. In analog
OPCs, The pigment gives analog
OPCs a dark blue color, and digital
OPCs a green color.)
Organic or inorganic additive
Plastic binder
Aluminum drum or nickel belt
October 1st, 1995 STYLES
Drum and Belt
3. STYLES
3.1. Drum and Belt
There are two types of OPCs used today: the drum type [A] and the belt type
[B].
The drum type has a base of aluminum or nickel. It is usually used in copiers,
as well as laser facsimile machines and laser printers.
The belt type has either a film of polyester or a nickel belt. The nickel belt has
a bond seam, while the polyester film is seamless. The belt type is used in laser facsimile machines and laser printers. It is not normally used in copiers.
[A]
[B]
OPC506.wmf
OPC505.img
3-1
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