IMAGE FORMING APPARATUS

摘要

Latent image graduations formed on an intermediate transfer belt are read by a first sensor portion. Latent image graduations formed on a photoconductive drum are read by a second sensor portion. When an image is transferred from the photoconductive drum to the intermediate transfer belt on the basis of the information read by these sensor portions, the position of the image on the photoconductive drum is controlled to match the position of the image on the intermediate transfer belt. The first sensor portion and the second sensor portion are held integrally by the holding member. Accordingly, variations due to a temperature change of relative positions between the sensor portions or difference in vibrations of the respective sensor portions which may cause errors when aligning the images are reduced.

主权项

1. An image forming apparatus comprising:
a conveying member configured to carry and convey an image or a recording medium; a first image carrier and a second image carrier arranged in a direction of conveyance of the conveying member and each configured to carry and convey an image; a first image forming portion configured to form an image on the first image carrier; a second image forming portion configured to form an image on the second image carrier; a first transfer portion configured to transfer an image from the first image carrier to the conveying member or the recording medium conveyed by the conveying member; a second transfer portion arranged downstream of the first transfer portion in the direction of conveyance of the conveying member, and configured to transfer an image from the second image carrier to the conveying member or the recording medium conveyed by the conveying member; a first positional information forming unit configured to form first positional information relating to a position of the image formed by the first image forming portion on the conveying member; a second positional information forming unit configured to form second positional information relating to a position of the image formed by the second image forming portion on the second image carrier; a first information detecting portion arranged so as to incline with respect to the direction of conveyance of the conveying member and configured to detect the first positional information formed on the conveying member; a second information detecting portion arranged so as to incline with respect to the direction of conveyance of the second image carrier and configured to detect the second positional information formed on the second image carrier; a control portion configured to control at least any one of the second image carrier, the second image forming member, and the conveying member such that the position of the image carried on the second image carrier matches the position of the image transferred from the first image carrier to the conveying member or the image transferred from the first image carrier to the recording medium conveyed by the conveying member when the image is transferred from the second image carrier to the conveying member or the recording medium conveyed by the conveying member on the basis of the first positional information detected by the first information detecting portion and the second positional information detected by the second information detecting portion; and a holding member arranged so as to be interposed between the second image carrier and the conveying member and configured to hold the first information detecting portion and the second information detecting portion integrally.