Optical scanning apparatus and image forming apparatus
a technology of optical scanning and image forming, which is applied in the direction of electrographic process apparatus, mountings, instruments, etc., can solve the problems of deterioration in image quality due to dirt on optical components, complicated shape, and inability to completely seal die cut holes h by sealing members, etc., and achieve high dust-proof performance
Inactive Publication Date: 2015-02-19
CANON KK
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Benefits of technology
This configuration enhances dust-proof performance by preventing fine dust from entering the optical component area, maintaining image quality and reducing manufacturing complexity and costs by eliminating the need for die cut holes.
Problems solved by technology
Deterioration in image quality due to dirt on the optical component has been becoming an issue more than before.
However, the casing 185 may have a number of ribs installed therein from the necessity of ensuring rigidity and may have a complicated shape due to an arrangement constraint of units around the image forming apparatus.
If the ribs are formed at positions where they prohibit the sealing members from being affixed, the die cut holes H cannot be completely sealed by the sealing members.
Thus, a human error in the affixing may occur.
Particularly, dust carried by surrounding air current and the rotating polygonal mirror rotating at high speed collide with each other.
More specifically, when the rotating polygonal mirror rotates, a Karman vortex and turbulence are generated around the reflection surface of the rotating polygonal mirror, and the air current carrying the dust violently collides with the reflection surface.
Thus, it is difficult to completely cover the opening portion.
However, fine particles in the order of several micrometers as described above cannot be prevented from entering.
Method used
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[0023]Various exemplary embodiments, features, and aspects of the invention will be described in detail below with reference to the drawings. A configuration of a conventional optical scanning apparatus will be described first, and then exemplary embodiments will be described.
Configuration of Conventional Optical Scanning Apparatus
[0024]FIG. 7 illustrates an outline of components of an optical scanning apparatus conventionally generally used. An optical scanning apparatus, which irradiates a photosensitive member with a light beam to form an electrostatic latent image, includes a rotating polygonal mirror 42 serving as a deflector, a motor unit 41 for rotating the rotating polygonal mirror 42, and optical members. The optical members include a collimator lens 43 and a cylindrical lens 44 for shaping a light flux incident on the motor unit 41. The optical members further include one or more fθ lenses (hereinafter referred to as optical lenses) 60 for equalizing a scanning speed of t...
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An optical scanning apparatus capable of fixing an optical member using a plate spring without forming a die cut hole and thus having high dust-proof performance includes a mirror supporting portion supporting a reflection mirror, and a projecting portion configured to form a gap between the reflection mirror supported on the mirror supporting portion and itself, and to deform the plate spring with the reflection mirror, and the projecting portion is provided with a cut hole for engaging the plate spring.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of U.S. patent application Ser. No. 14 / 203,199, filed on Mar. 10, 2014, the content of which is expressly incorporated by reference herein in its entirety. This application also claims the benefit of Japanese Patent Application No. 2013-049101 filed Mar. 12, 2013, which is hereby incorporated by reference herein in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a dust-proof measure for a casing of an optical scanning apparatus used for an image forming apparatus such as a copying machine, a printer, a facsimile, or their multifunction peripheral.[0004]2. Description of the Related Art[0005]As an optical scanning apparatus used for an electrophotographic image forming apparatus, an optical scanning apparatus having the following configuration has been well-known. The optical scanning apparatus forms a latent image on a photosensitive me...
Claims
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IPC IPC(8): G02B27/00G02B7/00G02B26/12
CPCG02B27/0006G02B7/00G02B26/125G03G15/04045G03G21/1666G03G2221/1654G03G2221/1678G03G13/04
InventorOTOGURO, YASUAKIISHIDATE, TAKEHIRO
OwnerCANON KK