Claims
- 1. A memory device to be mounted on a process cartridge, which includes an image bearing member and developing means whose contact or separation status with respect to the image bearing member is changeable, and which is detachably attachable to an image forming apparatus, which develops an electrostatic latent image on the image bearing means by contact of the developing means to the image bearing member at one of a plurality of process speeds, said memory device comprising:a first memory portion for storing parameters according to each process speed, for calculating data on the degree of damage to the image bearing member on the basis of a contact period during which the developing means contacts the image bearing member; and a second memory portion into which data on the integration of the calculated damage degree data of the image bearing member is to be written.
- 2. A memory device according to claim 1, wherein the parameter stored in said first memory portion comprises the coefficients of the contact period for calculating the damage degree data.
- 3. A memory device according to claim 1, further comprising:a third memory portion for storing data about the life of the image bearing member.
- 4. A memory device according to claim 3, wherein the data stored in the third memory portion comprises data to be compared with the integrated damage degree data to produce a warning that the life of the image bearing member has expired.
- 5. A memory device according to claim 4, wherein the data stored in the third memory portion further comprises data to be compared with the integrated damage degree data to determine whether the life of the image bearing member will expire soon.
- 6. A memory device according to claim 3, wherein the data stored in the third memory portion comprises life selection data relating to the selecting of image bearing member life data based on a table representing the relationship between the life selection data and the image bearing member life data.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2001-006946 |
Jan 2001 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATION
This application is a divisional application of application Ser. No. 10/041,590, filed Jan. 10, 2002, now U.S. Pat. No. 6,549,733, issued Apr. 15, 2003.
US Referenced Citations (10)
Foreign Referenced Citations (8)
Number |
Date |
Country |
63-149669 |
Jun 1988 |
JP |
1-267667 |
Oct 1989 |
JP |
4-51259 |
Feb 1992 |
JP |
4-98265 |
Mar 1992 |
JP |
5-188674 |
Jul 1993 |
JP |
5-333626 |
Dec 1993 |
JP |
6-130732 |
May 1994 |
JP |
6-180518 |
Jun 1994 |
JP |