Abstract: An image forming apparatus has functions of tilt adjustments to a mirror for reflecting a laser beam and outputting an image after registration of a plurality of images.

Abstract: A body frame has a main frame portion in which a process unit for sequentially performing electrophotographic processes from charging a photosensitive member to developing an image, a fixing device, a paper supply device, and a paper transport device are fixed being positioned in their places. The body frame also has an optical frame portion in which an exposure device for throwing light in accordance with printing data on the photosensitive member charged through a charging process is fixed being positioned in its place. Namely, the body frame incorporates both the main frame portion and the optical frame portion therein and, hence, the photosensitive member of the process unit and the exposure device are mounted on one main body accurately positioned with respect to each other. Therefore, images of improved quality can be obtained. Further, since it is not necessary to provide the main frame and the optical frame separately, downsizing of the entire apparatus can be attained.

Abstract: In an optical unit of the present invention, a laser element and a glass lens are contained in a lens barrel. The ray axis of the laser beam is aligned with the optical axis of the glass lens without accidental displacement. By surely fixing the lens barrel, shift of the lens along the optical axis or variation in distance between the lens and laser element can be prevented. In contrast, a manufacturing precision of a lens barrel holding member may be lowered and low-in-cost. In order to ensure exact fixing of the lens barrel, a leaf-spring and a bonding agent are used. In this case, it is desirable that the force per unit contact length exerted by the leaf-spring onto the lens barrel be in the range of 100<F<400 [gf/mm]. The amount of the bonding agent is determined so as to be sufficient for fixing the lens barrel and to prevent flowing-out of the bonding agent and an increase in time for drying.

Abstract: This invention relates to a device and a method for securing optical elements to a housing. The optical elements such as a tertiary lens, a fourth lens, a reflecting mirror, and a filter glass are received in the housing and bonded to the same by means of a visible ray hardening type bonding agent. A maximum bonding strength can be obtained by setting the bonding agent to have a thickness of 10-100 .mu.m and a hardness of 80 or less on the A-scale based on the Shore hardness test. Further, much time is not required for hardening the bonding agent.