Patent ID: 8780159
Filing Date: 2014-07-15
Classification: G02B,G03G

Abstract:
1. An optical scanner, comprising: a light source to emit a light beam; an optical element including a scan lens to convert the light beam into a desirable shape; a deflector to deflect the light beam to scan a photoreceptor with the light beam; a casing to house the light source, the optical element, and the deflector, the casing including a casing bottom and walls including a transparent plate defining a deflector compartment to accommodate the deflector, and an optical element mounting portion to accommodate the light source and the optical element; a first cover to cover the optical element mounting portion; and a second cover to cover the deflector compartment, wherein the deflector compartment is a single continuous space comprising an upper portion and a lower portion which are divided along a direction parallel to the casing bottom, the lower portion being disposed below the upper portion, and the upper portion having a length L wherein in a direction perpendicular to the casing bottom, the following relation is satisfied: B1>B2, where B1 is a volume of the upper portion of the deflector compartment and B2 is a volume of the lower portion of the deflector compartment.