Fixing device, image forming apparatus and control method for fixing device
A technology of a fixing belt and a control unit, which is applied in the direction of electric recording process applying charge pattern, equipment of electric recording process applying charge pattern, electric recording technique, etc. problem, to prevent the preheating time from becoming longer, to stabilize the fixing performance, and to ensure the effect of the fixing performance.
Inactive Publication Date: 2010-08-18
SHARP KK
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Problems solved by technology
In this way, when the resistance value of the planar heating element fluctuates, the energized power value of the planar heating element during preheating fluctuates in the range where the maximum power value is about 4.2 times the minimum power value, and the preheating time becomes shorter. long
[0014] In addition, in the fixing device, when the setting value of the fixing temperature is changed according to the material of the material to be fixed and the ambient temperature in which the fixing device is installed, the energized power value of the planar heating element also fluctuates, and it is not possible to ensure Stable Fixing Performance
Method used
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Examples
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Embodiment 1
[0195] The fixing device used in Example 1 is the fixing device 15 of the present embodiment described above. In the fixing device of Example 1, 10 ceramic heating elements having a total resistance value of 23Ω in a room temperature (20° C.) environment were used as heating sources for heating the fixing belt. In addition, a variable voltage power supply was connected to the ceramic heating element, and the voltage applied to the ceramic heating element was variably controlled so that the cut-in power value was fixed at 1200W.
Embodiment 2
[0197] As a heating source for heating the fixing belt, 10 ceramic heating elements having a total resistance value of 35Ω in a normal temperature (20° C.) environment were used, and the same as in Example 1 except that.
Embodiment 3
[0213] The fixing device used in Example 3 is the same as that in Example 2. In addition, in Example 3, control was performed so that the power applied to the ceramic heating element was 1200 W during preheating and 900 W during heating.
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A fixing device is provided. A fixing device includes a heating section that has a heat source comprised of a ceramic heat generating element that generates heat by electric power supply and has a positive temperature coefficient property. Then, in the heating section, an applied voltage value by a voltage variable power source to the ceramic heat generating element is variably controlled by a control unit such that an input power value in the ceramic heat generating element is approximately constant.
Description
technical field [0001] The present invention relates to a fixing device, an image forming device, and a control method of the fixing device. Background technique [0002] Electrophotographic image forming apparatuses that form images by electrophotography are widely used in copiers, printers, facsimile machines, multifunction machines, and the like because they can easily form images with good image quality. [0003] An electrophotographic image forming apparatus (hereinafter simply referred to as “image forming apparatus”) includes, for example, a photoreceptor, a charging unit, an exposure unit, a developing unit, a transfer unit, and a fixing unit. An image forming apparatus is an apparatus that performs a charging process, an exposure process, a development process, a transfer process, and a fixing process using a photoreceptor and these components to form an image on a material to be fixed. [0004] As the fixing unit that performs the fixing process, for example, a fi...
Claims
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IPC IPC(8): G03G15/20
CPCG03G2215/2016G03G15/2078G03G15/5004G03G15/2039
Inventor 香川敏章景山洋行
Owner SHARP KK