Abstract: A fusing belt type heat fusing device has a rotating fusing roller, a driven heating roller, an endless fusing belt wrapped and stretched around the two rollers, a pressure roller that applies pressure to the fusing roller through the fusing belt, and a separation agent application and tension transmission element that applies an offset suppression separation agent to the fusing belt in addition to transmitting tension to the fusing belt. The separation agent application and tension transmission element is installed so as to make contact with the fusing belt at an upstream side of the heating roller in the rotation direction of the fusing belt between the fusing roller and the heating roller and at a position closer to the heating roller than a center position between the fusing roller and the heating roller.

Abstract: An induction heating fixing device comprises a heat roller in which coil assemblies are disposed. The coil assemblies are aligned axially of the roller to produce magnetic flux in a direction orthogonal to the axis of the heat roller.

Abstract: An image forming apparatus having a rotatable image carrier, a first exposing device for forming an electrostatic latent image by irradiating an optical beam according to image data to the image carrier, a second exposing device to from another electrostatic latent image by irradiating an optical beam according to image data to the image carrier in a different irradiating position on the image carrier by the first exposing device, a developing device for developing the electrostatic latent images formed by the first exposing device and second exposing device, and a device for transferring the developed electrostatic images all together on the surface of a recording medium, has a device to form a first and a second pattern latent image on the image carrier by concurrently operating the first and the second exposing device while the image carrier is on the rotation at the first speed, a pattern detecting device for detecting the first and the second pattern latent image, a measuring device for measuring a time

Abstract: A laser beam scanning apparatus having a laser beam generating section generating first and second laser beams, a rotatable polygonal mirror for deflecting the first and second laser beams to form scanning lines each extending in a main scanning direction on a beam receiving surface and an optical system for imaging the first and second laser beams deflected by the polygonal mirror on the beam receiving surface. Each of the first and second laser beams impinges on the reflective face of the polygonal mirror at an angle with respect to an optical axis in a sub-scanning direction perpendicular to the main scanning direction. The following condition is satisfied:.vertline..beta..times.tan.theta.a.vertline..ltoreq.(5/3).times.Pi.vertline..beta..times.tan.theta.b.vertline..ltoreq.(5/3).times.Pi.vertline..theta.a.vertline.+.vertline..theta.b.vertline..gtoreq..vertline. .psi.a.vertline.+.vertline..psi.b.vertline.where .beta. is a magnification of the optical system in the sub-scanning direction, .theta.a and .theta.