Claims
- 1. An image forming apparatus comprising an optical system including a rotating polygon mirror for reflecting light beams emitted from a light source to effect an optical scanning on a photosensitive drum in an axial direction thereof to form an electrostatic latent image on the photosensitive drum,
- wherein the polygon mirror has a plurality of mirror surfaces each having an inclination of angle non-zero .theta. .theta..noteq.90.degree..times.n; n is an integer relative to a rotational axis of the polygon mirror, and the polygon mirror is rotated so that each mirror surface is inclined by the angle .theta. to a line normal to a scanning plane, while incident light beams to the polygon mirror are inclined by an angle 2.theta. to the scanning plane.
- 2. An image forming apparatus according to claim 1, wherein the polygon mirror is molded with a high-fluidity resin.
- 3. An image forming apparatus comprising an optical system including a rotating polygon mirror for reflecting light beams emitted from a light source to effect an optical scanning on a photosensitive drum in an axial direction thereof to form an electrostatic latent image on the photosensitive drum,
- wherein the polygon mirror has a plurality of mirror surfaces each having an inclination of angle non-zero .theta. .theta..noteq.90.degree..times.n; n is an integer relative to a rotational axis of the polygon mirror, and the polygon mirror is rotated so that each mirror surface is vertical to a scanning plane, while incident light beams to the polygon mirror are on a plane including the scanning plane.
- 4. An image forming apparatus according to claim 3, wherein the polygon mirror is molded with a high-fluidity resin.
- 5. A polygon mirror, comprising:
- an axis about which the polygon mirror can be rotated; and
- a plurality of mirror surfaces, each having an inclination of angle non-zero .theta. .theta..noteq.90.degree..times.n; n is an integer relative to the axis.
- 6. A polygon mirror according to claim 5, wherein the polygon mirror has a molded construction.
- 7. A polygon mirror according to claim 6, wherein the polygon mirror is molded with a high-fluidity resin.
- 8. A scanning apparatus, comprising:
- a polygon mirror including an axis about which the polygon mirror can be rotated, and a plurality of mirror surfaces, each having an inclination of angle non-zero .theta. .theta..noteq.90.degree..times.n; n is an integer relative to the axis;
- means for rotating the polygon mirror about the axis; and
- means for projecting incident light beams onto the plurality of mirror surfaces to effect an optical scanning.
- 9. A scanning apparatus according to claim 8, further comprising means for transforming the optical scanning into an electrostatic image.
- 10. A scanning apparatus according to claim 9, wherein the means for transforming comprises a photosensitive drum.
- 11. A scanning apparatus according to claim 8, wherein the incident light beams are incident on the plurality of mirror surfaces at an angle 2.theta. relative to a plane normal to the axis.
- 12. A scanning apparatus according to claim 8, wherein the polygon mirror has a molded construction.
- 13. A scanning apparatus according to claim 12, wherein the polygon mirror is molded with a high-fluidity resin.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-064319 |
Mar 1991 |
JPX |
|
Parent Case Info
This is a Continuation of application Ser. No. 07/857,775 filed Mar. 26, 1992 now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4692629 |
Nakamura |
Sep 1987 |
|
5130840 |
Iima et al. |
Jul 1992 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
49-28355 |
Jan 1974 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
857775 |
Mar 1992 |
|