Claims
- 1. A method of correcting a position for writing an image on a transport belt included in an image forming apparatus, said method comprising the steps of:
- a) electrostatically writing at least two latent images to be developed into different colors having a substantially same shape on the transport belt in a substantially same area by optical writing devices;
- b) developing each of the latent images by a toner of particular color by developers to form corresponding toner images;
- c) illuminating the resulting toner images and sensing reflections from the toner images by a single optical sensor; and
- d) correcting a position at which an image is written on the transport belt by at least one of the optical writing devices on the basis of the sensed reflections.
- 2. A method as claimed in claim 1, wherein the reflections are regular reflections.
- 3. A method as claimed in claim 1, wherein the reflections are diffused reflections.
- 4. A method of correcting a position for writing an image on a transport belt included in an image forming apparatus, said method comprising the steps of:
- a) electrostatically writing at least two latent images to be developed into different colors having a substantially same shape on the transport belt in a substantially same area by optical writing devices;
- b) developing each of the latent images by a toner of particular color by developers to form corresponding toner images;
- c) illuminating the resulting toner images and sensing transmitted light from the toner images by a single optical sensor; and
- d) correcting a position at which an image is written on the transport belt by at least one of the optical writing devices on the basis of the sensed transmitted light.
- 5. A method as claimed in claim 4, wherein the transmitted light is total transmitted light.
- 6. A method as claimed in claim 4, wherein the transmitted light is non-diffused transmitted light.
- 7. In an image forming apparatus in which a plurality of writing means, each being assigned to a particular color, form respective latent images on a transport belt and develop the respective latent images with toner of respective colors, a method of automatically adjusting writing positions of said plurality of writing means, comprising the steps of:
- a) causing said plurality of writing means to form at least two toner patterns on the transport belt for position adjustment of the respective colors;
- b) sensing with a single optical sensor changes in quantities of light reflected from or transmitted through said toner patterns of two different colors by sensing a relationship in positions between said toner patterns; and
- c) adjusting write start positions of the writing means such that said toner patterns are formed at a position where an output of said optical sensor is one of a maximum and a minimum.
- 8. A method as claimed in claim 7, wherein step
- a) forms the two toner patterns which do not overlap each other.
- 9. A method as claimed in claim 7, wherein step
- c) changes a start time of one of the writing means.
Priority Claims (2)
Number |
Date |
Country |
Kind |
3-292128 |
Oct 1991 |
JPX |
|
4-158246 |
Jun 1992 |
JPX |
|
CROSS REFERENCE TO RELATED APPLICATION
This application is a Continuation of application Ser. No. 08/077,381 filed on Jun. 17, 1993, now U.S. Pat. No. 5,627,649 which is a continuation-in-part of U.S. application Ser. No. 07/959,094, filed Oct. 9, 1992, now abandoned.
US Referenced Citations (4)
Continuations (1)
|
Number |
Date |
Country |
Parent |
77381 |
Jun 1993 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
959094 |
Oct 1992 |
|