Photocopying – Contact printing – Light boxes
Patent
1993-03-04
1994-08-16
Smith, Matthew S.
Photocopying
Contact printing
Light boxes
346107R, 355228, 355 67, G03G 2100, G03G 1500
Patent
active
053391322
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a mount structure of a light emitting element array in an electronic photographing apparatus, in which a photoconductor drum is exposed to a light from a light emitting array having a plurality of light emitting diodes to form a latent image on the drum.
In such a mount structure of a light emitting element array in an electronic photographing apparatus, a beam emitted from a light emitting element is focused on a photoconductor drum by a lens so that a beam radiated from one light emitting element forms one dot of an image. Therefore, a precise distance between the light emitting array and the photoconductor drum must be maintained.
BACKGROUND ART
FIG. 5 shows a mount structure of a light emitting element array in an electronic photographing apparatus known in the prior art (FIG. 5(A) being a front view and FIG. 5(B) being a side view). A plurality of light emitting diodes (LED) are arranged on a LED array 91 that is rigidly mounted on leaf springs 92. The bearings (spacing means) 94 rotatably mounted on the LED array 91 are urged to the photoconductor drum 95, so that the distance between the LED array 91 and outer periphery of the photoconductor drum (information recording media) 95 remains constant.
However, due to the rotating photoconductor drum 95, the leaf springs 92 vibrate in the direction A, so that the bearings 94 do not stably contact the surface of the photoconductor drum 95. Therefore, the leaf springs 92 are pushed from the back thereof by means of rubber dampers 97 mounted on the fixed bracket 96 so as to restrict the vibration of the leaf springs 92 and prevent a rough printing.
In the mount structure of a light emitting element array in an electronic photographing apparatus known in the prior art as mentioned above, the bearings 94 are strongly urged to the surface of the photoconductor drum 95 by a damping force of the rubber dampers in addition to a spring force of the leaf springs 92 and, therefore, the surface of the photoconductor drum 95 becomes worn after extended use, so that the distance between the LED array 91 and the periphery of the photoconductor drum 95 is reduced. Thus, focusing on the photoconductor drum 95 for one dot will be out of order and image quality will deteriorate.
Also, the leaf spring 92, particularly, the central portion 92a thereof which is not pushed by the rubber damper 97 vibrates or is twisted, so that the image deposited on the photoconductor drum 95 will deteriorate or will produce jitters (disorder of dots) and image quality is reduced.
DISCLOSURE OF INVENTION
An object of the present invention is to provide a mount structure of a light emitting element array in an electronic photographing apparatus, in which a high quality stable light image can be deposited on the photoconductor drum from a light emitting array, even after extended use.
According to the present invention, there is provided a mount structure of a light emitting element array in an electronic photographing apparatus, comprising a cylindrical photoconductor drum rotatably driven around an axis, a light emitting element array having a plurality of light emitting elements arranged parallel to the axis of the photoconductor drum and opposite to an outer surface thereof, characterized by a fixed rigid bracket fixedly mounted on the electronic photographing apparatus; a rotatable rigid bracket rotatably mounted on the fixed bracket and fixedly secured to the light emitting element array; a bias means for urging the light emitting element array against the outer surface of the photoconductor drum; a space keeping means that is pushed by the bias means against the outer surface of the photoconductor drum so as to maintain a constant distance between the light emitting element array and the outer surface of the photoconductor drum.
It is advantageous for the rotatable bracket to be rotatably mounted on the fixed bracket by a pair of bearings arranged a certain interval apart in such a manner that, at one of the bearings, the rotatable bracket i
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Tomita Hiroyuki
Yoshida Kohichi
Fujitsu Isotec Limited
Fujitsu Limited
Smith Matthew S.
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