| 摘要 |
An optical scanner includes a light source, an optical element, a deflector, a casing, and a first cover. The deflector deflects the light beam emitted from the light source to scan a photoreceptor through the optical element. The casing includes an upper opening, 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. The first cover covers the upper opening of the casing and includes a recessed portion recessed toward the bottom of the casing and including a first opening at the bottom thereof facing the deflector. The recessed portion and the walls are directly or indirectly connected to define a single continuous space isolating the deflector compartment from the optical element mounting portion. The recessed portion and the deflector compartment communicate via the first opening. |
| 主权项 |
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 L1B in the direction parallel to the casing bottom, the length L1B being greater than a length L2B of the lower portion in the direction parallel to the casing bottom, and 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. |
