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Image forming apparatus having a plurality of laser scanner units

A laser scanning and laser technology, applied in optical components, optics, electrical recording technology using charge patterns, etc., can solve the problem of losing the cost advantage of double cassettes

Active Publication Date: 2008-07-16
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the structures of the two laser scanning units 200, 201 are different, and the cost advantage of the double-cassette type is correspondingly lost due to the different structures

Method used

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  • Image forming apparatus having a plurality of laser scanner units
  • Image forming apparatus having a plurality of laser scanner units
  • Image forming apparatus having a plurality of laser scanner units

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0049] The first embodiment of the present invention will be described using the drawings. FIG. 1 is an explanatory diagram of an image forming apparatus according to a first embodiment. In the description, the entire image forming apparatus will be described first, and then the structure of the scanning optical device (laser scanning unit) will be described.

[0050] (image forming device)

[0051] FIG. 1 is a diagram showing an image forming apparatus 15 according to an embodiment of the present invention. The image forming apparatus 15 is capable of superimposing toner images of four colors (cyan C, yellow Y, magenta M, and black K) to form a color image, and has four image forming stations. Each image forming station has a first image carrier (photosensitive drum 1C), a second image carrier (photosensitive drum 1Y), a third image carrier (photosensitive drum 1M), and a fourth image carrier (photosensitive drum 1K).

[0052]In addition, the image forming apparatus 15 has...

no. 2 Embodiment approach

[0094] use image 3 A second embodiment of the present invention will be described. image 3 It is an explanatory diagram of the image forming apparatus of the second embodiment. In the description, the description of the same configuration as above is omitted.

[0095] (image forming device)

[0096] Such as image 3 As shown, the image forming apparatus 52 of this embodiment includes the above-mentioned first scanning optical device 16a and second scanning optical device 16b.

[0097]Light beams 51C, 51Y, 51M, and 51K emitted from scanning optical devices 16a, 16b form latent images on the surfaces of photosensitive drums 50C, 50Y, 50M, and 50K similarly to the above-described embodiments. Among the four photosensitive drums, the black and cyan photosensitive drums 50K, 50C at both ends in the vertical direction (Z direction in the figure) of the image forming device 52 are sent to the transfer material conveyor belt with respect to the magenta and yellow photosensitive ...

no. 3 Embodiment approach

[0105] Figure 13 and Figure 14 The third embodiment is shown. In the first and second embodiments described above, the optical path shape of the third laser beam is approximately the same as that of the first laser beam, and the optical path shape of the fourth laser beam is approximately the same as that of the second laser beam. On the other hand, in this embodiment, the optical path shape of the first laser beam is substantially the same as that of the fourth laser beam, and the optical path shape of the second laser beam is substantially the same as that of the third laser beam. At this time, if Figure 14 As shown, the two light sources 19C and 19Y mounted on the first laser scanning unit 16a are arranged on one side (the front side in this embodiment) of the image forming apparatus, and the two light sources 19C and 19Y mounted on the second laser scanning unit 16b The individual light sources 19M and 19K are arranged on the other side (rear side in this embodiment). ...

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Abstract

An image forming device, characterized in that the shape of the optical path of a third laser beam from a third semiconductor laser (19M) to a third photo-sensitive member drum (1M) is approximately the same as that of the optical path of a first laser beam from a first semiconductor laser (19C) to a first photo-sensitive member drum (1C), a second virtual line connecting the rotating center of the third photo-sensitive member drum (1M) to the rotating center of a fourth photo-sensitive member drum (1K) is tilted relative to a first virtual line connecting the rotating center of the first photo-sensitive member drum (1C) to the rotating center of the second photo-sensitive member drum (1Y), and an angle formed by the rotating axis (x2) of a second rotating polygon mirror (20b) and the second virtual line (12) is equal to an angle formed by the rotating axis (x1) of a first rotating polygon mirror (20a) and the first virtual line (11).

Description

technical field [0001] The present invention relates to an image forming apparatus including a plurality of laser scanning units, such as a color copier and a color printer. Background technique [0002] As a color copier and a color printer using electrophotographic recording technology, there is an image forming apparatus in which four photoreceptors are arranged in tandem. The tandem image forming apparatus has the advantages of a large number of recording media that can be used and a high recording speed, and has gradually become the mainstream form of color image forming apparatuses in recent years. [0003] As one form of such a tandem image forming apparatus, Japanese Patent Application Laid-Open No. 2003-279875 and Japanese Patent Laid-Open No. 10-221617 describe a device in which the number of laser scanning units is two relative to four photoreceptors (double cassette). In each scanning unit mounted in such an image forming apparatus, two optical systems share on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/01G03G15/04G02B26/10B41J2/44
Inventor 福富章宏
Owner CANON KK
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