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Optical scanning apparatus

a scanning apparatus and optical box technology, applied in the direction of electrographic process apparatus, instruments, printing, etc., can solve the problems of deformation of optical boxes, difficulty in dust entering the apparatus,

Inactive Publication Date: 2009-09-10
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present invention was made in consideration of the above described problem. Thus, the primary object of the present invention is to provide an optical scanning apparatus, the sealing member of which can keep the optical box of the apparatus satisfactory reliably sealed without causing the optical box of the apparatus to deform.

Problems solved by technology

Thus, in order to prevent the optical components from being soiled, the optical scanning apparatus is structured so that it is difficult for the dusts to enter the apparatus.
Then, the optical box or the cap is deformed by the high rigidity portion, or the elasticity of the sealing member is not high enough to accommodate the deformation of the optical box or the cap, with the result of liability of deforming the optical box or the cap.
This would result in deformation of the optical box.

Method used

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embodiment 1

[0026]FIG. 1 is a sectional view of an electrophotographic full-color printer, as an example of an image forming apparatus, in which the optical scanning apparatus in accordance with the present invention is mountable. It shows the general structure of the image forming apparatus. FIG. 2 is a sectional view of the optical scanning apparatus in this preferred embodiment of the present invention. It shows the general structure of the apparatus. (General Structure of Image Forming Apparatus)

[0027]First, referring to FIG. 1, the electrophotographic full-color printer, as an example of an image forming apparatus, in which the optical scanning apparatus in accordance with the present invention is mountable, will be described. The image forming apparatus 100 in this embodiment is of a so-called tandem type. It has four image forming portions (PY, PM, PC, and PK), which are disposed in tandem in a straight line.

[0028]The image forming apparatus has: an image forming portion PY, which is for...

embodiment 2

[0096]This preferred embodiment of the present invention will be described primarily regarding the problem which might occur when assembling the optical scanning apparatus 1, based on the contents of the description of the first preferred embodiment of the present invention given above.

[0097]The abovementioned problem that when the lid 3, to which the sealing member 5 formed of thermoplastic elastomer has been attached, is attached to the optical box 2 of the optical scanning apparatus 1, dusts or the like contaminants enter the optical box. Thus, hereafter, the means for preventing the dusts or the like from entering the optical box (optical scanning apparatus) will be described along with this problem.

[0098]It is sometimes noticed, during the process of attaching the lid 3 to the optical box 2, that after the formation of the sealing member 5 on the lid 3 in a manner to be integrated with the lid 3, fine dusts have adhered to the integral combination of the sealing member 5 and li...

embodiment 3

[0117]Referring to FIGS. 13A, 13B and 13C, a further embodiment of the present invention will be described. FIG. 13A is a sectional view of a part of a cap 3 and a different bent type sealing member 131. FIG. 13B is a partial perspective view of the bent type sealing member 131. FIG. 13C is a partially sectional view illustrating a state in which the bent type sealing member 131 is in contact with the inner wall 21 (side wall 21) of the optical box. The broken line 21a shows a surface of the wall when the inner wall 21 is offset inwardly.

[0118]The bent type sealing member 131 of this embodiment is produced, similarly to the first embodiment, by the insertion molding with a thermoplastic elastomer, wherein the sealing member 131 has a material and rigidity which are different from those of the cap 3, similarly. The bent type sealing member 131 of this embodiment is different from the first embodiment in the sealing material and the cross-sectional configuration. As shown in FIG. 13A,...

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Abstract

A scanning optical apparatus includes an optical box accommodating a deflection device for scanningly deflecting a laser beam emitted by a light source and an optical part for directing the laser beam toward a member-to-be-scanned; a cap mounted to the optical box; a sealing member extending from the cap, wherein the sealing member is made of a material exhibiting easier deformation than the cap, and is contacted to a wall of the optical box in a deformed state.

Description

FIELD OF THE INVENTION AND RELATED ART[0001]The present invention relates to an optical scanning apparatus for scanning the surface of an image bearing member with a beam of laser light. More specifically, it relates to an optical scanning apparatus mountable in an image forming apparatus, for example, an electrophotographic copying machine, a printer, a facsimile machine, and a multifunction image forming apparatus made up of a combination of the preceding apparatuses.[0002]First, referring to FIG. 12, an example of a conventional optical scanning apparatus mountable in an image forming apparatus, such as an electrophotographic copying machine, a printer, a facsimile machine, and a multifunction image forming apparatus made up of a combination of the preceding image forming apparatuses, will be described.[0003]The optical scanning apparatus shown in FIG. 12 generally has a light source unit 30a and a cylindrical lens 30b. The light source unit 30a is made up of a semiconductor lase...

Claims

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Application Information

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IPC IPC(8): G03G16/00
CPCB41J2/473G02B27/0006G03G2215/0132G03G15/0435G03G15/04036
Inventor MOGI, SHIN
Owner CANON KK
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