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Optical sensor and image forming apparatus incorporating same

A technology of an optical sensor and a light-receiving part, applied in the field of optical sensors, can solve the problems of reduced toner fixing rate, no high-quality images, uneven image density, etc.

Active Publication Date: 2015-04-29
RICOH KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in terms of smoothness, the difference in fixing conditions may lead to a decrease in the rate of toner fixing to the surface concave part of the recording material, and high image quality cannot be obtained after image density unevenness or color unevenness occurs. image of

Method used

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  • Optical sensor and image forming apparatus incorporating same
  • Optical sensor and image forming apparatus incorporating same
  • Optical sensor and image forming apparatus incorporating same

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Experimental program
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Embodiment Construction

[0027] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0028] However, although the state of the surface of recording paper as a recording material can also be measured by a confocal microscope, the inclination of the surface irregularities in the recording paper is relatively sharp, and there are many noise components in the measurement results, and the measurement takes time. longer. Therefore, in the paper industry, as an index of the surface state of paper such as recording paper, the smoothness of paper is evaluated based on the measurement results of the air leakage test, which is a relatively simple measurement method. This index of smoothness is used in paper-related industries. For example, even in the development of copiers, the smoothness of paper is used as a standard to optimize printing conditions. That is, as an index showing the surface state of paper, rather than a general index showing the state of the su...

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Abstract

An optical sensor includes a light-emitting unit to emit light onto a measuring object, a regular reflection light receiver to receive regular reflection light from the measuring object out of the light emitted by the light-emitting unit, and a diffuse reflection light receiver to receive diffuse reflection light from the measuring object out of the light emitted by the light-emitting unit. An angle of incidence of the light emitted onto a surface of the measuring object is not smaller than 75° and not larger than 85°. The diffuse reflection light receiver receives, out of the diffuse reflection light from the measuring object, diffuse reflection light having an angle of reflection with respect to a perpendicular to the surface of the measuring object larger than 0° and smaller than an angle of reflection of the regular reflection light with respect to the perpendicular to the surface of the measuring object.

Description

technical field [0001] The present invention relates to a reflective optical sensor that receives regular reflection light and diffuse reflection light reflected by an object after being irradiated from a light emitting unit, and image forming apparatuses such as printers, copiers, and facsimiles including the optical sensor. Background technique [0002] An electrophotographic image forming apparatus forms an image by transferring a toner image onto a recording material such as recording paper, applying heat and pressure under predetermined conditions, and fixing the toner image to the recording material. In such an image forming apparatus, fixing conditions such as temperature and pressure when fixing a toner image need to be considered in order to achieve high image quality. This is because the quality of the image recorded on the recording material is affected by the material, thickness, humidity, smoothness, coating state, etc. of the recording material. For example, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/00
CPCG03G15/5029G01N21/55
Inventor 越智照通和井田匠加藤真治石井稔浩平井秀二藤田贵史行方伸一山科亮太吉浦有信山野元义
Owner RICOH KK