Medium texture detection device

Patent metadata

Field	Value
Publication number	US-10054435-B2
Application number	US-201615250729-A
Country	US
Kind code	B2
Filing date	Aug 29, 2016
Priority date	Sep 1, 2015
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

A medium texture detection device includes: a radiation optical system that radiates non-coherent light to a sheet-shaped medium which is being transported; and a light reception optical system that receives diffused/reflected light of the non-coherent light from the medium. A surface of the medium has a basic structure for making a change in an intensity of the diffused/reflected light according to a position of the medium in a transport direction of the medium. A visual field of the light reception optical system is set to be equal to or greater than 1/10 times and equal to or less than 4 times of a size of the basic structure.

First claim

What is claimed is:

1. A medium texture detection device comprising:
a radiation optical system that radiates non-coherent light to a non-printing surface Pb of a sheet-shaped medium which is being transported, wherein the non-printing surface Pb is on an underside of the sheet-shaped medium; and
a light reception optical system that receives diffused/reflected light of the non-coherent light from the medium,
wherein a surface of the medium has a basic structure for making a change in an intensity of the diffused/reflected light according to a position of the medium in a transport direction of the medium, and
wherein a visual field of the light reception optical system is set to be equal to or greater than 1/10 times and equal to or less than 4 times of a size of the basic structure.

2. The medium texture detection device according to claim 1 , wherein the size of the basic structure is a space period indicating a space frequency component that has a maximum real part among space frequency components included in the change in the intensity of the diffused/reflected light.

3. The medium texture detection device according to claim 1 , wherein the non-coherent light is light with a wavelength of an infrared region.

4. The medium texture detection device according to claim 1 , wherein the radiation optical system includes
a light source that emits the non-coherent light, and
a light-guiding unit that guides the non-coherent light to the medium, and wherein the light reception optical system includes
an optical fiber that receives the diffused/reflected light from the medium through an incidence surface which is one end surface as a light reception surface and exits the diffused/reflected light from an exit surface which is the other end surface,
a photosensor that receives the diffused/reflected light emitted from the exit surface and outputs an electric signal according to an intensity of the received diffused/reflected light, and
a condensing lens that condenses the diffused/reflected light emitted from the exit surface of the optical fiber toward the photosensor.

Assignees

• Seiko Epson Corp

Inventors

• Otsuka Shuji

Classifications

• G01N21/4738 Primary

  Diffuse reflection (precedence is given to G01N21/55 - G01N21/57 if specular component is taken into consideration), e.g. also for testing fluids, fibrous materials · CPC title

• G01B11/303 Primary

  using photoelectric detection means · CPC title