reflective sensor
A reflective sensor, specular reflection technology, applied in instruments, scientific instruments, measurement of scattering characteristics, etc., can solve the problems of low light utilization efficiency, low position detection accuracy, etc., and achieve the effect of high robust performance
Active Publication Date: 2019-09-27
ORMON CORP
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Problems solved by technology
However, since the robustness is not positively improved, the position detection accuracy will be lowered under the influence of the diffused light that was sacrificed to ensure the robustness.
Therefore, the detection accuracy of the toner density and the detection accuracy of the positional shift are both moderate.
In addition, since no lens is used, there is also a problem that the utilization efficiency of the light from the light source unit is low.
Method used
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[0060] Hereinafter, embodiments of the present invention will be described in detail. figure 1 It is a figure showing the appearance of the reflective sensor 1 of this embodiment, figure 2 is a diagram showing a schematic configuration of the reflective sensor 1, image 3 It is a figure showing the schematic structure of the image forming apparatus 51 equipped with the reflective sensor 1, Figure 4 It is a diagram showing how the toner patch (color material image) 80 on the transfer belt 56 is read by the reflective sensor 1 .
[0061] Reflective sensor 1 mounted on image 3 on the image forming apparatus 51 as shown. The image forming device 51 is, for example, a color laser printer or the like. First, a schematic configuration of the image forming apparatus 51 will be described.
[0062] The image forming apparatus 51 has a document reading unit 52 at the upper part, forms an image by the image forming unit 53 based on the document data read by the document reading u...
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A reflective sensor in which an optical system is disposed on an optical path that reflects light emitted from a light emitting unit and irradiated on an object to be detected to reach a light receiving unit. This optical system condenses the light from the light emitting unit so that the deviation between the regular reflection light receiving range and the diffuse reflection light receiving range is within a predetermined range in the sub-scanning direction, which is the moving direction of the object to be detected, in the light receiving unit. In the direction perpendicular to the moving direction, light is refracted so that the light receiving range including the specular reflection light receiving range and the diffuse reflection light receiving range expands in a direction perpendicular to the sub-scanning direction.
Description
technical field [0001] The present invention relates to a reflective sensor that reads reflected light from a moving inspection object. Background technique [0002] Image forming apparatuses such as copiers, printers, and facsimiles are equipped with a toner density sensor that reads the toner density and a positional displacement sensor that reads the position of an image to detect a positional shift. As a toner density sensor or a positional displacement sensor, a reflective sensor having a light-emitting element and a light-receiving element is generally used. [0003] In reflective sensors, light is irradiated to the object to be sensed by a light-emitting element, and the reflected light is read by a light-receiving element. A photocurrent corresponding to the intensity of the read light is generated on the light receiving element and detected as a voltage value. By forming the object to be detected as a toner image formed on a recording medium or an intermediate tra...
Claims
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IPC IPC(8): G03G15/08
CPCG03G15/0855G03G15/5058G03G2215/00059G03G2215/0161G03G15/5041G03G2215/00042G01N21/4738G01N21/55G01N21/86
Inventor 太子芳爵河合肇宫本宽之
Owner ORMON CORP