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Image forming apparatus and method of detecting amount of residual developer

An imaging device and developer technology, applied in volume measuring instruments/methods, liquid level indicators for physical variable measurement, measuring capacity, etc., can solve problems such as false detection of remaining toner

Inactive Publication Date: 2009-06-24
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] In summary, the above-mentioned developing bias formed by superimposing AC voltage on DC voltage is applied to the developer carrying member to generate a dielectric voltage between electrodes provided in the developer accommodating portion of the developing device, thereby detecting the developing In the configuration of the remaining amount of toner in the device, due to the difference in the detection value of the remaining amount of developer before and after switching the amplitude of the AC component of the developing bias, the remaining amount of toner in the developing device is erroneously detected. question

Method used

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  • Image forming apparatus and method of detecting amount of residual developer
  • Image forming apparatus and method of detecting amount of residual developer
  • Image forming apparatus and method of detecting amount of residual developer

Examples

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Embodiment 1

[0044] figure 1 is a schematic diagram showing the structure of an embodiment of the imaging device according to the present invention. An example of this image forming apparatus is an electrophotographic laser beam printer including a drum-shaped electrophotographic photosensitive member, ie, a photosensitive drum 1 , serving as an image bearing member.

[0045] The photosensitive drum 1 is constituted by forming a photosensitive material such as OPC or amorphous Si on a cylindrical base typically made of aluminum or nickel, and is composed of a driving device 1a and figure 1 In the clockwise direction indicated by the arrow a, it is driven at a predetermined rotation speed to rotate.

[0046] A charging device 2 is provided at a peripheral position of the rotating photosensitive drum 1 to uniformly charge the peripheral surface of the photosensitive drum 1 to have a predetermined polarity and a predetermined potential. The charging device 2 of this embodiment is a contac...

Embodiment 2

[0125] In the above description of the first embodiment, a plate antenna (PA) is disposed in the developing device 4 as an electrode for detecting the remaining amount of toner. However, as a large-capacity toner cartridge is recently used in an image forming device, a developing device including a plurality of plate antennas (PA) for detecting the remaining amount of toner is widely used. Furthermore, when a plurality of plate antennas PA are arranged in the developing device, it is preferable to use a configuration in which the plate antennas PA respectively respond to different toner remaining amount measurement ranges.

[0126] For example, the plate antenna PA2 may be configured to detect the remaining amount of toner from 40% to 10% with high accuracy, and the other plate antenna PA1 may be configured to detect the remaining amount of toner from 10% to 0% with high accuracy. Toner remaining amount to divide the measurement range.

[0127] In order to divide the measurem...

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Abstract

The present invention provides an image forming device and a method for detecting the remaining amount of developer. The image forming apparatus has a developer container accommodating a developer and a developer carrying member for carrying the developer, adapted to switch an AC voltage applied to the developer carrying member, and includes: a detection member for detecting the developer an amount of the developer in the container; and a processing section for judging the amount of the developer in the developer container based on a value output by the detection section when an AC voltage is applied to the developer carrying member, the processing section by Processing corresponding to the operation of switching the AC voltage is performed to determine the amount of developer.

Description

technical field [0001] The present invention relates to an image forming apparatus that forms an electrostatic latent image on an image bearing member by electrophotography and visualizes the electrostatic latent image with a developer; and also relates to a method for detecting the remaining amount of the developer. More particularly, the present invention relates to an electrophotographic image forming apparatus having means for detecting a remaining amount of developer adapted to repeatedly detect a developing device housed in a developing device or a process cartridge of the image forming apparatus. The remaining amount of developer; also relates to a method for detecting the remaining amount of developer. [0002] For the present invention, the electrophotographic image forming apparatus includes electrophotographic copiers, electrophotographic printers (LED printers, laser beam printers, etc.), and electrophotographic facsimile machines. For the present invention, a pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/08G03G21/14G01F22/00G01F23/22
Inventor 户田纯庄子武夫砂原贤长谷川秀明
Owner CANON KK