Laser printer

Abstract

Abstract PURPOSE:To attain high-quality printing, by constituting a reflective mirror with an elliptic reflective mirror provided with an elliptic reflective surface and placing the laser light reflective face of a rotary polyhedral mirror and the laser light irradiation face of a rotary photosensitive drum in the focus position of this elliptic reflective mirror. CONSTITUTION:The laser light reflection point of a rotary polyhedral mirror 2 exists in one of focus positions F1 and F2 of an elliptic reflective mirror 21, and the laser light irradiation position exists in the other. By this constitution, even if the reflective face of the rotary polyhedral mirror is inclined somewhat from an ideal face S1, which is vertical to a line F1.F2 connecting focuses F1 and F2 of the elliptic mirror 21, as a face S2 indicated by a dotted line, incident laser light P is reflected in the position of the focus F2 on faces S1 and S2, namely, one focus of the elliptic reflective mirror and is reflected at a point A or B through a path (a) or (b) and is condensed at one point of the rotary photosensitive drum 5, which exists in the position of the other focus F1, to irradiate this point. Thus, the influence of the precision of inclination of the rotary reflective mirror 2 which scans the laser light for writing a print latent image is reduced.

Inventors

• 👤 Masashi Okumura
• 👤 奥村　昌史
• 👤 Masanori Koike
• 👤 正憲 小池

Bibliographic Details