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AssigneeKonica Corporation
InventorsMasashi Sugano, Kouichi Sawada, Takayuki Suzuki
Estimating the term…
An image forming apparatus which forms an image on a recording material, which has: a writing section to write according to the image data; an oscillator to generate a synchronized synchronizing clock signal; a spreading clock generator to spread the band of a synchronized reference clock and generate spreading clock signals; and a plurality of control circuits to control the image forming apparatus and each section of the image forming apparatus including a writing control circuit to control the writing section. More than one control circuits in the control circuits other than the writing control circuit are driven by the spreading clock signals, and the writing control circuit is driven by the synchronizing clock signal.
An image forming apparatus for forming an image on a recording material, the image forming apparatus comprising:
An image forming apparatus comprising:
An image forming apparatus for forming an image on a recording material, comprising:
An image forming apparatus for forming an image on a recording material, comprising:
An image forming apparatus for forming an image on a recording material, comprising:
An image forming apparatus for forming an image on a recording material, the image forming apparatus comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g.…
Scanning, transmission or reproduction of documents or the like
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof: arrangements for controlling a…
Using a programmed control device, e.g. a microprocessor: details of system components
Term ended 17 Nov 2023 (estimated)
The present invention relates to an image forming apparatus to form an image on a recording material, and to an image reading device to read out the image of a document.
A digital copier is, in its function, structured by the image forming apparatus to form an image on a recording material, and an image reading device to read out the image of the document. In the digital copier, various control circuits are used. For example, there are a writing control circuit to control a writing section to conduct writing according to the image data, a photoelectric conversion control circuit to control a photoelectric conversion section to receive the light from the document and photoelectrically convert it, a reading image processing circuit to image process the image data output from the photoelectric conversion section, an operation control circuit to control an operation section, a sequence control circuit to control the sequence of the overall image forming apparatus, and an ADF control circuit to control an automatic document feeding apparatus. These control circuits are driven by using, for example, a quartz oscillator, by a clock signal synchronized with a predetermined frequency, and the data is transferred between respective control circuits, and reading out of the image data or image formation are conducted. The clock signal is one of the largest generation sources of the electromagnetic interference, so called EMI. As the countermeasure for it, conventionally, various countermeasures are taken in the manner that these control circuits are surrounded by a frame body, or the similar manner, however, it is an actual situation that these are not yet satisfactory.
As a countermeasure for the EMI of the clock signal, a technology which recently attracts one's attention is a technology in which the Spectrum Spreading clock (SSC) theory is applied on the Spectrum Spreading clock generator (SSCG). This technology can spread the band of the synchronized clock signal, and thereby, can attenuate the peak radiation of the fundamental wave or the higher harmonics. FIG. 6 is a view in which the horizontal axis shows the frequency and the vertical axis shows the electromagnetic wave radiant intensity, and is a view typically showing the spectrum spreading clock. As can clearly be sheen FIG. 6, to the waveform of the synchronized clock (broken line) before spreading, in the spectrum spreading clock which is modulated and spread, the intensity becomes low.
FIG. 1 is a typical view showing the structure of a digital copier 1 (hereinafter, simply called also a copying apparatus).
FIG. 2 is a block diagram expressing a control system of the copier 1 of the first embodiment.
FIG. 3 is a view showing a modulation profile of a spreading clock generator.
Referring to the drawings, the present invention will be described below, however, prior to this, an outline of a digital copier having an image forming apparatus and an image reading device will be described. FIG. 1 is a typical view showing a structure of the digital copier 1 (hereinafter, simply called also copying apparatus).
In the drawing, the copying apparatus has an automatic document feeder (a popular name, ADF) A, and a document image reading section B to read an image of the document conveyed by the automatic document conveying device A, and an image forming section (no sign) to image-form the image read out by the document image reading section B on the recording sheet, and the document image reading section B is provided above the image forming section, and the automatic document conveying device A is provided above the automatic document reading section B.
The image forming section has a writing section D to write according to the read out image data, an engine section E to image-form on the recording sheet, and a plurality of feeding sheet accommodation means (hereinafter, called a feeding sheet tray, or simply, tray) 22 and 24, such as the tray to accommodate the recording sheet P.