阅读说明：本技术 静电电容检测装置及图像读取装置 (Capacitance detection device and image reading device ) 是由 尾込智和 时田直幸 松井秀树 国枝达也 于 2018-12-26 设计创作，主要内容包括：本发明的静电电容检测装置包括：夹住沿着片状的检测对象物(3)被传送的方向即传送方向的传送路径(5)、且至少一部分相对的第1电极(1)和第2电极(2)；在第1电极(1)与第2电极(2)之间形成电场(9)的振荡电路；检测第1电极(1)与第2电极(2)之间的静电电容的变化的检测电路；形成有振荡电路与检测电路中的至少一方的第1基板(11)和第2基板(12)；形成在第1电极(1)与传送路径(5)之间的绝缘性的第1平板(6)；以及形成在第2电极(2)与传送路径(5)之间的绝缘性的第2平板(7)。(The electrostatic capacitance detection device of the present invention includes: a 1 st electrode (1) and a 2 nd electrode (2) which sandwich a conveying path (5) in a conveying direction which is a direction in which a sheet-like detection object (3) is conveyed and at least partially face each other; an oscillation circuit for forming an electric field (9) between the 1 st electrode (1) and the 2 nd electrode (2); a detection circuit that detects a change in electrostatic capacitance between the 1 st electrode (1) and the 2 nd electrode (2); a 1 st substrate (11) and a 2 nd substrate (12) on which at least one of an oscillation circuit and a detection circuit is formed; an insulating 1 st plate (6) formed between the 1 st electrode (1) and the conveyance path (5); and an insulating 2 nd flat plate (7) formed between the 2 nd electrode (2) and the conveyance path (5).)

1. An electrostatic capacitance detection apparatus, comprising:

a 1 st electrode and a 2 nd electrode, the 1 st electrode and the 2 nd electrode sandwiching a conveying path along a conveying direction which is a direction in which a sheet-like detection object is conveyed, and at least a part of the 1 st electrode and the 2 nd electrode being opposed to each other; an oscillation circuit that forms an electric field between the 1 st electrode and the 2 nd electrode; a detection circuit that detects a change in electrostatic capacitance between the 1 st electrode and the 2 nd electrode; a 1 st substrate on which at least one of the oscillation circuit and the detection circuit is formed; and a 2 nd substrate, the 2 nd substrate having at least the other of the oscillation circuit and the detection circuit formed thereon,

the 1 st electrode and the 2 nd electrode are disposed on an upstream side or a downstream side in the conveyance direction of the conveyance path of a 1 st reading position in a 1 st image reading unit that reads an image of the detection object.

2. The electrostatic capacitance detecting device according to claim 1,

the apparatus further includes an insulating 1 st plate formed between the 1 st electrode and the conveyance path, and an insulating 2 nd plate formed between the 2 nd electrode and the conveyance path.

3. The electrostatic capacitance detection apparatus according to claim 1 or claim 2,

the 1 st electrode and the 1 st substrate are electrically connected through a conductive buffer member, and the 2 nd electrode and the 2 nd substrate are electrically connected through a conductive buffer member.

4. The electrostatic capacitance detection apparatus according to any one of claims 1 to 3,

in the 1 st substrate, a side surface of the 1 st substrate faces the 1 st electrode in an electric field direction which is a direction in which the 1 st electrode faces at least a part of the 2 nd electrode, and is electrically connected to the 1 st electrode via a connection wiring formed on the side surface of the 1 st substrate.

5. The electrostatic capacitance detection apparatus according to any one of claims 1 to 4,

in the 2 nd substrate, a side surface of the 2 nd substrate faces the 2 nd electrode in an electric field direction which is a direction in which the 1 st electrode faces at least a part of the 2 nd electrode, and is electrically connected to the 2 nd electrode via a connection wiring formed on the side surface of the 2 nd substrate.

6. The electrostatic capacitance detecting device according to claim 2,

the 1 st electrode is formed on the 1 st plate, and the 2 nd electrode is formed on the 2 nd plate.

7. The electrostatic capacitance detecting device according to claim 2,

the 1 st electrode is formed on the 1 st substrate.

8. The electrostatic capacitance detecting device according to claim 2,

the 1 st electrode is formed on a side surface of the 1 st substrate.

9. The electrostatic capacitance detecting device according to claim 7,

the 1 st substrate has a portion along an electric field direction, which is a direction in which the 1 st electrode and at least a portion of the 2 nd electrode face each other, except for a portion in which the 1 st electrode is formed.

10. The electrostatic capacitance detection apparatus according to claim 2 or claim 7,

the end of the 1 st substrate is bent and is in direct or indirect contact with the 1 st flat plate, or the end of the 1 st substrate is bent and is opposite to the 1 st flat plate.

11. The electrostatic capacitance detecting device according to claim 2,

the 2 nd electrode is formed on the 2 nd substrate.

12. The electrostatic capacitance detecting device according to claim 2,

the 2 nd electrode is formed on a side surface of the 2 nd substrate.

13. The electrostatic capacitance detecting device according to claim 11,

the 2 nd substrate has a portion along an electric field direction, which is a direction in which the 1 st electrode and at least a part of the 2 nd electrode face each other, except for a portion in which the 2 nd electrode is formed.

14. The electrostatic capacitance detection apparatus according to claim 2 or claim 11,

the end of the 2 nd substrate is bent and is in direct or indirect contact with the 2 nd plate, or the end of the 2 nd substrate is bent and is opposite to the 2 nd plate.

15. The electrostatic capacitance detection apparatus according to any one of claims 1 to 14,

the detection device further includes an identification circuit that identifies the type of the detection object that is conveyed, based on the change in the capacitance detected by the detection circuit.

16. The electrostatic capacitance detecting device according to claim 15,

the identification circuit determines that foreign matter is attached to the detection object based on a change in the electrostatic capacitance when it is determined that the electrostatic capacitance further changes while the detection object of the type passes through the electric field.

17. The electrostatic capacitance detection apparatus according to any one of claims 1 to 14,

the detection device further includes an identification circuit that determines that foreign matter is attached to the conveyed detection object based on a change in the capacitance detected by the detection circuit.

18. The electrostatic capacitance detecting device according to claim 17,

the identification circuit identifies the type of the foreign substance adhering to the detection object based on a change in the capacitance when it is determined that the detection object adhering to the foreign substance has further changed in the process of passing through the electric field.

19. An image reading apparatus, characterized by comprising:

the electrostatic capacitance detection device according to any one of claim 1 to claim 18; a 1 st light source for irradiating the detection object with light; and the 1 st image reading unit that reads an image by using reflected light or transmitted light of the 1 st light source on the detection object.

20. The image reading apparatus according to claim 19,

at least one of the 1 st substrate and the 2 nd substrate shields light emitted from the 1 st light source.

21. An image reading apparatus, characterized by comprising:

the electrostatic capacitance detection device according to any one of claim 1 to claim 18; a 2 nd light source for irradiating the detection object with light; a 2 nd image reading unit for reading an image by using reflected light or transmitted light of the 2 nd light source on the detection object,

the 2 nd image reading section is located on the opposite side of the 1 st image reading section of the capacitance detection device in the conveyance direction.

22. The image reading apparatus according to claim 21,

at least one of the 1 st substrate and the 2 nd substrate shields light emitted from the 2 nd light source.

23. The image reading apparatus according to any one of claims 19 to 22,

the main surface of at least one of the 1 st substrate and the 2 nd substrate is arranged parallel to a direction orthogonal to the conveying direction.

24. The image reading apparatus according to any one of claims 19 to 22,

the main surfaces of the 1 st substrate and the 2 nd substrate are arranged in parallel to a direction orthogonal to the conveyance direction, and the 1 st substrate and the 2 nd substrate are arranged to be shifted in the conveyance direction.

25. An electrostatic capacitance detection apparatus, comprising:

a 1 st electrode and a 2 nd electrode, the 1 st electrode and the 2 nd electrode sandwiching a conveying path along a conveying direction which is a direction in which a sheet-like detection object is conveyed, and at least a part of the 1 st electrode and the 2 nd electrode being opposed to each other; an oscillation circuit that forms an electric field between the 1 st electrode and the 2 nd electrode; a detection circuit that detects a change in electrostatic capacitance between the 1 st electrode and the 2 nd electrode; a 1 st substrate on which at least one of the oscillation circuit and the detection circuit is formed; a 2 nd substrate on which at least the other of the oscillation circuit and the detection circuit is formed; an insulating 1 st plate formed between the 1 st electrode and the conveyance path; and an insulating 2 nd plate, the insulating 2 nd plate being formed between the 2 nd electrode and the conveyance path.

26. The electrostatic capacitance detecting device according to claim 25,

the 1 st electrode is formed on the 1 st substrate.

27. The electrostatic capacitance detecting device according to claim 25,

the 1 st electrode is formed on a side surface of the 1 st substrate.

28. The electrostatic capacitance detecting device according to claim 26,

the 1 st substrate has a portion along an electric field direction, which is a direction in which the 1 st electrode and at least a portion of the 2 nd electrode face each other, except for a portion in which the 1 st electrode is formed.

29. The electrostatic capacitance detection apparatus according to claim 25 or claim 26,

the end of the 1 st substrate is bent and is in direct or indirect contact with the 1 st flat plate, or the end of the 1 st substrate is bent and is opposite to the 1 st flat plate.

30. The electrostatic capacitance detecting device according to claim 25,

the 2 nd electrode is formed on the 2 nd substrate.

31. The electrostatic capacitance detecting device according to claim 25,

the 2 nd electrode is formed on a side surface of the 2 nd substrate.

32. The electrostatic capacitance detecting device according to claim 30,

the 2 nd substrate has a portion along an electric field direction, which is a direction in which the 1 st electrode and at least a part of the 2 nd electrode face each other, except for a portion in which the 2 nd electrode is formed.

33. The electrostatic capacitance detection apparatus according to claim 25 or claim 30,

the end of the 2 nd substrate is bent and is in direct or indirect contact with the 2 nd plate, or the end of the 2 nd substrate is bent and is opposite to the 2 nd plate.

34. An image reading apparatus, characterized by comprising:

the electrostatic capacitance detection device of any one of claim 25 to claim 33; a light source that irradiates the detection target with light; an image reading unit for reading an image by using light reflected from or transmitted through the object to be detected by the light source,

the 1 st electrode and the 2 nd electrode are disposed on an upstream side or a downstream side of an image reading position of the image reading unit in the conveying direction of the conveying path.

35. The image reading apparatus according to claim 34,

the image reading section includes:

a lens element for photopolymerizing light reflected by the detection object or light transmitted through the detection object via at least one of the 1 st plate and the 2 nd plate; and a sensor element that receives the polymerized light polymerized by the lens element.

36. The image reading apparatus according to claim 34 or claim 35,

at least one of the 1 st substrate and the 2 nd substrate shields light emitted from the light source.

37. The image reading apparatus according to any one of claims 34 to 36,

the main surface of at least one of the 1 st substrate and the 2 nd substrate is arranged parallel to a direction orthogonal to the conveying direction.

38. The image reading apparatus according to any one of claims 34 to 36,

the main surfaces of the 1 st substrate and the 2 nd substrate are arranged in parallel to a direction orthogonal to the conveyance direction, and the 1 st substrate and the 2 nd substrate are arranged to be shifted in the conveyance direction.

Technical Field

The present invention relates to a capacitance detection device that detects a change in capacitance between electrodes provided so as to sandwich an object to be detected, and an image reading apparatus including the capacitance detection device.

Background

The following devices have been known: electrostatic capacitance between electrodes provided so as to sandwich a sheet-like detection object including banknotes, securities, and the like is detected, and a case where a tape of a minute size, that is, a foreign substance is stuck on a surface is detected (for example, see patent document 1). Further, there are the following means: the present invention is directed to a device for discriminating authenticity (authenticity) of a detection object including a capacitance sensor for detecting a change in capacitance and a sensor for detecting other information (see, for example, patent document 2). The electrostatic capacitance sensor, which is an apparatus for detecting a change in electrostatic capacitance disclosed in patent documents 1 and 2, detects a change in electrostatic capacitance between electrodes of a detection object by conveying the detection object between the electrodes of parallel plate capacitors.

The apparatuses disclosed in patent documents 1 and 2 are suitable for apparatuses that need to discriminate the authenticity of a sheet-like detection object including banknotes and securities. Examples of the device for discriminating the authenticity include an ATM (automated teller Machine/Telling Machine), a change Machine, an automatic teller Machine, a ticket vending Machine, and a vending Machine. In order to determine whether or not an object to be detected is genuine, there is an ATM including a paper thickness detection device having a platen roller and an ultrasonic sensor and detecting a paper thickness. The paper thickness detection device can be used for distinguishing paper money and valuable paper with abnormal paper thickness. The paper thickness is discriminated and the change of the electrostatic capacitance is used to detect the attachment of foreign matter to paper money or valuable paper.

Broken banknotes and securities are sometimes repaired and reused by, for example, a resin transparent tape. In order to prevent the repaired bills and securities from being distributed in the market, the ATM detects that foreign matter is stuck to the bills and securities as the detection objects, and collects the detected bills and securities in the device of the ATM. For example, as disclosed in patent document 2, banknotes and securities repaired with an ATM detection tape or paper are stored in a reject box after a part of the damaged banknotes is repaired, and returned to a banknote outlet if they are counterfeit banknotes obtained by connecting banknotes cut into a strip shape, for example. Further, the banknote thickness sensor disclosed in patent document 2 detects two or more detection objects that are conveyed in a superimposed manner.

Further, conventionally, there is an image reading apparatus that optically reads image information of a sheet-like detection object including banknotes and securities (for example, see patent document 3). The image reading apparatus disclosed in patent document 3 has a plurality of light sources. Fig. 24 of patent document 3 discloses an image reading apparatus including a light shielding member so that light emitted from a light source is not irradiated to a region other than a desired region.

Disclosure of Invention

Technical problem to be solved by the invention

As described above, a paper thickness detection device is required to prevent the circulation of repaired bills and valuable papers. However, the paper thickness detection device having the platen roller and the ultrasonic sensor causes an increase in size and cost of the ATM. Therefore, as disclosed in patent document 1, detecting the adhesion of foreign matter, not the thickness of the object to be detected, is effective for preventing the circulation of repaired bills and valuable papers. However, in the device for detecting electrostatic capacitance disclosed in patent document 1, the electrostatic capacitance detection electrode has a three-dimensional shape that is difficult to be miniaturized. One of the reasons why the three-dimensional shape is difficult to be miniaturized is that corners of the dielectric covering the electrodes need to be chamfered. Therefore, the structure of the device for detecting electrostatic capacitance disclosed in patent document 1 is complicated, and the miniaturization and the decomposition of the device are limited.

Further, patent document 2 discloses an upper conveyance roller and a lower conveyance roller provided for conveying an inspection object between an upper conveyance guide and a lower conveyance guide. The electrostatic capacity sensor disclosed in patent document 2 has trapezoidal protrusions at the same row position as the upper and lower conveyance rollers. The electrostatic capacitance sensor is formed by providing an application electrode and a detection electrode on the surfaces of the two protrusions facing the detection object. Therefore, the electrostatic capacity sensor disclosed in patent document 2 has a complicated structure, and the miniaturization and the decomposition of the device are limited.

Thus, the device for detecting electrostatic capacitance disclosed in patent document 1 and the electrostatic capacitance sensor disclosed in patent document 2 have a problem of complicated structure. Further, the conventional electrostatic capacity sensor has the following problems: the device and the sensor for detecting information other than the change in the capacitance of the detection object do not have high cooperativity. Examples of devices or sensors for detecting information other than the change in capacitance include the sensor disclosed in patent document 2 and sensors typified by the ultrasonic sensor described above. Patent document 2 discloses an image sensor for detecting a pattern (image) of a detection target, a magnetic sensor for detecting a magnetic pattern of the detection target, and a fluorescence sensor for detecting a fluorescence image of the detection target.

The present invention has been made in view of the above circumstances, and an object thereof is to simplify and miniaturize the structure of a capacitance detection device or an image reading apparatus having the capacitance detection device.

Technical scheme for solving technical problem

In order to achieve the above object, a capacitance detection device according to the present invention includes: a 1 st electrode and a 2 nd electrode, the 1 st electrode and the 2 nd electrode sandwiching a conveying path along a conveying direction which is a direction in which a sheet-like detection object is conveyed, and at least a part of the 1 st electrode and the 2 nd electrode being opposed to each other; an oscillation circuit that forms an electric field between the 1 st electrode and the 2 nd electrode; and a detection circuit that detects a change in electrostatic capacitance between the 1 st electrode and the 2 nd electrode. The electrostatic capacitance detection device further includes: a 1 st substrate on which at least one of an oscillation circuit and a detection circuit is formed; and a 2 nd substrate on which at least the other of the oscillation circuit and the detection circuit is formed. The 1 st electrode and the 2 nd electrode are arranged on the upstream side or the downstream side of a reading position in an image reading unit for reading an image of a detection object in a conveying direction of a conveying path.

Effects of the invention

According to the present invention, the 1 st electrode and the 2 nd electrode are disposed on the upstream side or the downstream side in the conveyance direction of the reading position in the image reading portion, whereby the size in the conveyance direction can be made small, and the structure of the electrostatic capacitance detection device can be simplified and downsized.

Drawings

Fig. 1 is a cross-sectional view of a capacitance detection device according to embodiment 1 of the present invention, taken along a transport direction and an electric field direction.

Fig. 2 is a cross-sectional view of a main part of the capacitance detection device according to embodiment 1, taken along the conveyance direction and the electric field direction.

Fig. 3 is a graph showing an example of the detection value of the capacitance detection device according to embodiment 1.

Fig. 4 is a cross-sectional view of a main part of a comparative example of the capacitance detection device according to embodiment 1, taken along the conveyance direction and the electric field direction.

Fig. 5 is a graph showing an example of the detection value of the comparative example of the electrostatic capacitance detection device according to embodiment 1.

Fig. 6 is a perspective view of a main part of the capacitance detection device according to embodiment 1.

Fig. 7 is a perspective view of a main part of the capacitance detection device according to embodiment 1.

Fig. 8 is a cross-sectional view of the image reading apparatus according to embodiment 1, taken along the transport direction and the electric field direction.

Fig. 9 is a cross-sectional view of a main portion of the capacitance detection device according to embodiment 1, taken along the conveyance direction and the electric field direction.

Fig. 10 is a cross-sectional view of the image reading apparatus according to embodiment 2 of the present invention, taken along the transport direction and the electric field direction.

Fig. 11 is a cross-sectional view of the image reading apparatus according to variation 1 of embodiment 2, taken along the transport direction and the electric field direction.

Fig. 12 is a cross-sectional view of the image reading apparatus according to variation 2 of embodiment 2, taken along the transport direction and the electric field direction.

Fig. 13 is a cross-sectional view of a 3 rd modification of the image reading apparatus according to embodiment 2, taken along the transport direction and the electric field direction.

Fig. 14 is a cross-sectional view of the image reading apparatus according to variation 4 of embodiment 2, taken along the transport direction and the electric field direction.

Fig. 15 is a cross-sectional view of the image reading apparatus according to variation 5 of embodiment 2, taken along the transport direction and the electric field direction.

Fig. 16 is a cross-sectional view of the image reading apparatus according to variation 6 of embodiment 2, taken along the transport direction and the electric field direction.

Fig. 17 is a cross-sectional view of the image reading apparatus according to modification 7 of embodiment 2, taken along the transport direction and the electric field direction.

Fig. 18 is a cross-sectional view of an image reading apparatus according to a modification 8 of embodiment 2, taken along the transport direction and the electric field direction.

Fig. 19 is a cross-sectional view of the image reading apparatus according to the 9 th modification of embodiment 2, taken along the transport direction and the electric field direction.

Fig. 20 is a cross-sectional view of the image reading apparatus according to the 10 th modification of embodiment 2, taken along the transport direction and the electric field direction.

Fig. 21 is a cross-sectional view of the image reading apparatus according to the 11 th modification example of the embodiment 2, taken along the transport direction and the electric field direction.

Fig. 22 is a cross-sectional view of the image reading apparatus according to the 12 th modification example of the embodiment 2, taken along the transport direction and the electric field direction.

Fig. 23 is an enlarged view of a portion of the image reading apparatus according to embodiments 1 and 2 where the 1 st electrode and the 1 st substrate are electrically connected to each other.

Fig. 24 is a cross-sectional view of the image reading apparatus according to embodiments 1 and 2, taken along the transport direction and the electric field direction.

Fig. 25 is a cross-sectional view of the image reading apparatus according to the 13 th modification of embodiment 2, taken along the transport direction and the electric field direction.

Fig. 26 is a cross-sectional view of the 14 th modification of the image reading apparatus according to embodiment 2, taken along the transport direction and the electric field direction.

Fig. 27 is a cross-sectional view of a 15 th modification of the image reading apparatus according to embodiment 2, taken along the transport direction and the electric field direction.

Fig. 28 is a cross-sectional view of the image reading apparatus according to the 16 th modification of embodiment 2, taken along the transport direction and the electric field direction.

Fig. 29 is a perspective view of a main part of the capacitance detection device according to embodiment 2.

Fig. 30 is a connection explanatory diagram of essential parts of the capacitance detection device according to embodiment 2.

Fig. 31 is a perspective view of a main part of the capacitance detection device according to embodiment 2.

Fig. 32 is a perspective view of a main part of the capacitance detection device (modification) according to embodiments 1 and 2.

Fig. 33 is a cross-sectional view of the capacitance detection device (modification) according to embodiments 1 and 2, taken along the transport direction and the electric field direction.

Detailed Description

Embodiments according to the present invention will be described below with reference to the drawings. In the following embodiments, the same components are denoted by the same reference numerals and descriptions thereof may be omitted. In the figure, the X-axis direction is a conveying direction, and means a direction in which the detection object is conveyed. The Y-axis direction is a direction orthogonal to the conveyance direction on the conveyance surface, and indicates an arrangement direction. The Z-axis direction is a direction orthogonal to the X-axis direction and the Y-axis direction, and indicates an electric field direction and a height direction of the capacitance detection device or the image reading device. The conveyance direction includes not only the movement direction of the detection object when the detection object is conveyed but also the movement direction of the electrostatic capacitance detection device or the image reading device when the detection object is fixed and the electrostatic capacitance detection device or the image reading device is moved. The arrangement direction is also referred to as a main scanning direction. The conveying direction is also referred to as a sub-scanning direction. The electric field direction is also referred to as the optical axis direction. The main scanning direction, the sub-scanning direction, and the optical axis direction will be described in detail in describing the image reading apparatus.