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Optical scanning device and image forming device

An optical scanning device and a technology of deflection scanning, which are applied in image communication, electric recording technology using charge patterns, and equipment using electric recording technology using charge patterns, etc., can solve the problems of reduced beam scanning accuracy, bending of the first imaging lens, and the second 1. Problems such as the reduction of the optical performance of the imaging lens to achieve the effect of improving the scanning accuracy

Active Publication Date: 2019-04-05
KYOCERA DOCUMENT SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the existing optical scanning device, there is the following problem: when the ambient temperature changes, due to the difference in the linear expansion coefficient between the lower imaging lens (hereinafter referred to as the first imaging lens) and the frame, the first imaging lens produces bending
After the first imaging lens is bent, the optical performance of the first imaging lens decreases and the scanning accuracy of the beam on the scanned surface decreases.

Method used

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  • Optical scanning device and image forming device
  • Optical scanning device and image forming device
  • Optical scanning device and image forming device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0021] figure 1 It is a schematic configuration diagram showing the image forming apparatus 1 in the embodiment. The image forming apparatus 1 is a tandem color printer, and includes an image forming unit 3 inside a box-shaped casing 2 . The image forming unit 3 transfers and forms an image on the recording paper P based on image data transmitted from an external device such as a computer connected to a network or the like. Below the image forming unit 3 , an optical scanning device 4 for irradiating a beam (laser) is arranged, and above the image forming unit 3 , a transfer belt 5 is arranged. Below the optical scanning device 4 , a paper storage unit 6 for storing recording paper P is disposed, and a manual paper feed unit 7 is disposed on the side of the paper storage unit 6 . On the side upper portion of the transfer belt 5 , a fixing unit 8 for performing a fixing process on an image transferred and formed on the recording paper P is disposed. A mark 9 is a paper disch...

Embodiment approach 2

[0037] Figure 5 Embodiment 2 is shown. In this embodiment, the bonding area between each upper bonding portion 52 and the lower imaging lens 42 a is different from that in the first embodiment described above. In addition, except for this point, the structure of this embodiment is the same as that of Embodiment 1. In the following embodiments, the same components as those in the first embodiment are given the same symbols, and detailed description thereof will be omitted.

[0038] That is, in the present embodiment, the bonding area between each upper bonding portion 52 and the lower imaging lens 42a is set larger than the bonding area between each lower bonding portion 51 and the lower imaging lens 42a. Thereby, the adhesive force of the pair of upper adhesive parts 52 to the two imaging lenses 42a, 42b can be strengthened, thereby reliably suppressing the bending deformation of the lower imaging lens 42a caused by changes in ambient temperature. Therefore, the same effec...

Embodiment approach 3

[0040] Figure 6 Embodiment 3 is shown. This embodiment differs from the above-described embodiments in that the lower adhesive portion 51 is more easily deformed in the main scanning direction than the upper adhesive portion 52 . In addition, except for this point, the structure of this embodiment is the same as that of Embodiment 1.

[0041] That is, in the present embodiment, the bonding area of ​​each lower bonding portion 51 and the lower imaging lens 42a is equal to the bonding area of ​​each upper bonding portion 52 and the lower imaging lens 42a, and the lower side The distance h2 between the imaging lens 42a and the bottom wall of the housing 44 is set to be sufficiently larger (for example, twice or more) than the distance h1 between the lower imaging lens 42a and the upper imaging lens 42b. Accordingly, the lower adhesive portion 51 is more easily deformed in the main scanning direction than the upper adhesive portion 52 . Therefore, when the ambient temperature ...

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PUM

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Abstract

A light scanning device (4) includes a deflection unit (41), a first imaging lens (42a), and a second imaging lens (42b). The plurality of the adhesion portions (51) interposed between the first imaging lens (42a) and the housing (44) are symmetrically located with respect to a center position of the first imaging lens (42a) in a main-scanning direction. The adhesion portions (52) interposed between the first imaging lens (42a) and the second imaging lens (42b) are symmetrically located with respect to the center position of the first imaging lens (42a) in the main-scanning direction, and are located in the main-scanning direction outside with respect to the adhesion portions (51) between the first imaging lens (42a) and the housing (44).

Description

technical field [0001] The present invention relates to an optical scanning device and an image forming apparatus including the optical scanning device. Background technique [0002] Conventionally, there is known an optical scanning device in which imaging lenses are stacked in multiple stages on the bottom wall of a housing. This optical scanning device includes: a light source unit that emits a plurality of light beams; and a deflection unit that deflects and scans the plurality of light beams emitted from the light source unit along a main scanning direction. The plurality of light beams deflected and scanned by the deflection unit are imaged on the scanned surface through their corresponding imaging lenses. [0003] An example in which imaging lenses are stacked in two stages above and below is proposed. [0004] The two imaging lenses have the same shape, and three cylindrical protrusions are formed on the lower surface of each imaging lens. Adhesive portions made o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/04
CPCG02B26/125G02B7/025G02B7/028G02B26/123G03G15/04072H04N1/06H04N1/113
Inventor 中野一成
Owner KYOCERA DOCUMENT SOLUTIONS INC