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US 4,905,042 AGranted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsSohei Tanaka, Koki Kuroda, Yoshitaka Ogino
Life of this patent
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AssigneeCanon Kabushiki Kaisha
InventorsSohei Tanaka, Koki Kuroda, Yoshitaka Ogino
Estimating the term…
An image forming apparatus comprises an optical system for regenerating an original manuscript; a regenerating member capable of regenerating the original manuscript in different modes; a means for setting the position of the optical system in accordance with respective modes; a detector for detecting information relating to the respective modes from the set position of the optical system, and a control device for controlling the regenerating member in accordance with the detected information by the detector. A protective apparatus is further provided which comprises a process load; a detector for detecting a continuous operation time of the load from the power frequency of an a.c. current supplied to the load, and a control device for controlling the operation of the process load in accordance with the output from the detector. The process load may be a lamp for exposing light on an original manuscript.
An image forming apparatus comprising:
A image forming apparatus comprising:
An image forming apparatus comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Apparatus for electrographic processes using a charge pattern: machine control of apparatus for electrographic processes using a charge pattern,…
For exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material: with variable magnification
Electrography
Term ended 27 Feb 2007 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to an image forming apparatus such as a copying machine.
2. Description of the Prior Art
FIG. 1 is a perspective view showing an example of the structure of a copying machine according to an embodiment of the present invention;
FIG. 2 is a sectional view of the structure of FIG. 1;
FIG. 3 is a diagrammatic view showing a relation between a black-out lamp and an image area on a photosensitive drum;
The present invention will now be described with reference to the accompanying drawings.
FIGS. 1 and 2 are perspective and sectional views showing one example of a structure of a copying machine according to the present invention. In the figures, reference number 1 denotes a rest made of transparent material on which a manuscript or the original to be copied is placed. A pushing plate 1-1 is mounted over the rest 1 for fixing the original onto the rest. An original board constructed of both rest 1 and plate 1-1 is moved forward in an F arrow direction and moved backward in a R arrow direction.
The image of the original placed on the original board 1 is reflected under illumination of a halogen lamp LA1, and the reflected original image is slit-exposed through a focusing lens 2 onto a photosensitive drum 3. A focal length of the lens 2 is changed with a size change setting dial 2a by an operator in accordance with a preset magnification.