JPH025719U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an example of the optical scanning device of this invention, Fig. 2 is a side view for explaining the surface tilt error of each reflective surface of the plane polygon mirror, and Fig. 3 is a side view of the plane polygon mirror. A side view showing how the surface inclination error of each reflective surface is equivalently corrected, No. 4
The figure is a front view showing how the scanning position of the laser beam is detected by the photodetector, Figure 5 is a system diagram showing an example of the mirror tilt control section, and Figure 6 is a time chart explaining its operation. , FIG. 7 is a plan view showing an example of a conventional optical scanning device, and FIG. 8 is a side view for explaining the surface tilt error of each reflective surface of the plane polygon mirror.

Claims (1)

[Claims for Utility Model Registration] (1) A laser light source, an imaging lens that focuses the laser light emitted from the laser light source, and a plane polygon that rotates at a constant speed and reflects the laser light that has passed through the imaging lens. An optical scanning device comprising: a mirror; and a photosensitive drum whose surface is curved so that a laser beam reflected by the plane polygon mirror forms an image and scans the surface to keep the scanning speed of the laser beam constant on the surface. (2) a laser light source; a plane reflecting mirror that reflects the laser beam emitted from the laser light source; a plane polygon mirror that rotates at a constant speed and that reflects the laser beam reflected by the plane reflection mirror; and this plane polygon mirror. a photosensitive drum that is scanned by the laser beam reflected by the plane polygon mirror, an imaging lens that forms an image of the laser beam reflected by the flat polygon mirror on the photosensitive drum, and a scanning speed of the laser beam on the photosensitive drum that is kept constant. , a scanning speed constant means integrated with the photosensitive drum or the imaging lens, and provided on one end side of the photosensitive drum, the scanning position of the laser beam on the photosensitive drum in a direction perpendicular to the axial direction of the photosensitive drum. a photodetector for detecting the scanning position of each reflective surface of the flat polygon mirror from the output of the photodetector with the flat reflective mirror at a predetermined inclination; , write data indicating the direction and amount of the deviation in the memory, and when the laser beam reflected by the flat reflective mirror is reflected by each reflective surface of the flat polygon mirror, read data about the reflective surface from the memory; An optical scanning device comprising: a mirror inclination control section that controls the inclination of the plane reflection mirror so that the scanning position becomes the predetermined position based on the data.