JP2005335379A - Contact detection sensor and contact detection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive contact detection sensor capable of easily detecting contact by a third person, and a contact detection method. <P>SOLUTION: The contact detection sensor is equipped with a reflection prevention structure wherein structural units each having a given shape are periodically arranged in an array at a pitch smaller than visible band wavelengths, and with a substrate having a reflection prevention structure at least partially on the surface. The reflection prevention structure enables recognizing the presence or absence of contact by a human body, based on a change in a reflection rate at a portion contacted by the human body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a contact detection sensor and a contact detection method for detecting contact, and more specifically to a contact detection sensor and a contact detection method for detecting contact by a third party.

  In recent years, with the increase in crime rate, bankbooks and credit cards are frequently stolen. In order to prevent unauthorized use of stolen bankbooks and credit cards, it is necessary to urgently take procedures to stop their use.

Patent Document 1 discloses an antireflection article that can further reduce light reflection due to fine irregularities on the surface and improve display visibility.
JP 2003-240904 A JP 2004-12640 A

  However, in reality, it may take time for the passbook or credit card owner to notice theft. Usually, a passbook and a credit card are often stored in a storage case or the like, and therefore, if only the contents are extracted from the storage case, it will be delayed to notice the theft. If the owner is not aware of the theft for a long time, there is a risk of financial damage such as unauthorized withdrawal of cash from the bankbook or misuse of credit cards.

  In addition, when a passbook or credit card is forged, it takes more time for the owner to notice the unauthorized use than when the passbook or credit card is stolen. A malicious third party temporarily obtains a bankbook or a credit card and reads the information recorded therein to make a copy. In this case, even if the bankbook or the like that has read the information is returned to the original location, a third party can illegally use the copy, so that the owner is less likely to notice the damage.

  Therefore, in order to notice such theft of the bankbook in a short time, a means for confirming whether or not a third party has touched the bankbook, credit card, case for storing them, or the like is required.

  For example, a security device such as a surveillance camera can be installed as a method for confirming contact with a passbook or a credit card by a third party. However, it is expensive to provide such a facility. Moreover, this method is not effective when the owner carries a passbook or a credit card.

  Also, a method of confirming contact by a third party by sticking a seal sticker to a bankbook or credit card storage case is conceivable. Patent Document 2 discloses a one-way seal that cannot be pasted again once it is peeled off. By sticking the one-way seal described in the document as a seal seal to the storage case, the owner can immediately know whether or not a third party has opened the storage case. However, the seal sticker cannot be attached to a passbook or credit card itself to detect contact by a third party. Therefore, as in the case of monitoring using a monitoring camera, the seal sticker is not effective when the owner carries the passbook or credit card without putting them in the storage case.

  Furthermore, although the one-way seal described in Patent Document 2 can be confirmed to be opened by sticking it to a sealed letter or the above storage case, a third party comes into contact with the attached object. I can't confirm that it doesn't. 2. Description of the Related Art In recent years, when food is sold, fraudulent acts have been detected one after another, in which false indications are made about the production area, raw materials, additives, and the like. In this case, since the disguise is performed by replacing the food itself or the raw material or by changing the label, there is an increasing need to prove that a third party is not in contact with the object. However, as described above, the one-way seal described in Patent Document 2 cannot confirm contact by a third party.

  Therefore, an object of the present invention is to provide an inexpensive contact detection sensor and a contact detection method capable of easily detecting contact by a third party.

  In order to solve the above-described problems, the inventors have found that the antireflection function described in Patent Document 1, for example, can be applied to a contact detection sensor. The present invention is a sensor that makes it possible to identify the presence or absence of human contact with an object to be detected, in which structural units having a predetermined shape are periodically arranged in an array at a pitch smaller than the visible band wavelength. An antireflection structure and a base material having an antireflection structure on at least a part of the surface, the antireflection structure is in contact with the human body based on a change in reflectance at a portion where the human body has contacted It is possible to identify whether or not there is any.

  The present invention also relates to a contact detection method that makes it possible to identify the presence or absence of human contact with an object to be detected, in which structural units having a predetermined shape are periodically arrayed at a pitch smaller than the visible band wavelength. Are arranged in advance on at least a part of the object to be detected, and based on the change in the reflectance of the antireflection structure at the part where the human body is in contact, The presence or absence of contact can be identified.

  According to the present invention, it is possible to provide an inexpensive contact detection sensor and contact detection method that can easily detect contact by a third party.

  Hereinafter, the present invention will be described more specifically with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating an application example of the contact detection sensor according to the first embodiment of the present invention. In FIG. 1, the case where the contact detection sensor is provided in the magnetic card is illustrated as an example. The magnetic card shown in FIG. 1 is, for example, a cash card, a credit card, or an ID card, in which information that may be used illegally is recorded. A contact detection sensor 1 is provided on at least a part of the surface of the magnetic card.

  FIG. 2 is an enlarged schematic perspective view of a part of the contact detection sensor 1 shown in FIG. A contact detection sensor 1 shown in FIG. 2 includes a base material 2 and an adhesive layer 4.

  The base material 2 is a sheet made of a transparent material such as an acrylic resin, a polycarbonate resin, or a polyethylene terephthalate resin, and has an antireflection structure 3 that is a contact detection portion on at least a part of the surface. Although the thickness of the base material 2 should just be easy to handle and can fully obtain mechanical strength, Preferably it is 0.05 mm or more. As an example, the size of the substrate 2 can be 10 mm × 20 mm × 0.05 mm. Actually, the size of the structural unit of the antireflection structure 3 is very small with respect to the thickness of the base material 2 and the adhesive layer 4, but the antireflection structure 3 is enlarged in the drawing. It is illustrated.

  The pressure-sensitive adhesive layer 4 is formed on the back surface of the surface having the antireflection structure of the substrate 2. The adhesive layer 4 is made of a material such as an acrylic adhesive, a rubber adhesive, or an oily gel adhesive. The contact detection sensor 1 is affixed to the magnetic card via the adhesive layer 4. In addition, before using the contact detection sensor 1, a release paper (not shown) for protecting the adhesive layer 4 is usually attached to the surface of the adhesive layer 4.

  The antireflection structure 3 is a structure in which structural units having a predetermined shape are periodically arranged in an array at a pitch smaller than a visible band wavelength (for example, 400 to 700 nm). Preferably, the pitch of the structural unit is smaller than the shortest wavelength of the visible band wavelength. By periodically arranging the structural units having a predetermined shape in an array, the apparent refractive index is continuously changed for visible light, and the transmission / reflection characteristics at the interface with the air layer It is possible to form an antireflection functional surface with little incidence angle dependency and wavelength dependency.

  In addition, the said pitch means the pitch in the densest arrangement direction, when the reflection preventing structure 3 is comprised by the two-dimensional arrangement | sequence of many fine structure units.

  Further, the antireflection structure 3 means a member having a fine structure formed on the surface in order to prevent reflection of visible light whose reflection should be reduced, and only a mode in which the light flux whose reflection should be reduced is not completely reflected. Rather, it also includes an aspect having an effect of preventing the reflection of a light beam whose reflection at a predetermined wavelength should be reduced.

  As the antireflection structure 3 that can be used in this embodiment, for example, conical protrusions having a height H1 as shown in the schematic enlarged view of FIG. 3A are used as structural units, and these conical protrusions have a pitch P1. Examples of the structure are periodically arranged in an array.

  The pitch P1 of the structural unit is substantially constant in one arrangement direction in the antireflection structure 3 and may be smaller than the visible band wavelength. However, the transmission / reflection characteristics at the interface depend on the incident angle and the wavelength. The pitch P1 is preferably ½ or less, more preferably １ ／ or less of the visible band wavelength, from the viewpoint that the property can be further reduced. For example, considering the manufacturability of the antireflection structure 3 as will be described later, it is desirable that the pitch P1 has a certain size, and is usually about 1/10 or more of the visible band wavelength. Further preferably, the pitch P1 is preferably 1/2 or less, more preferably 1/3 or less of the shortest wavelength of the visible band wavelength, and is usually about 1/10 or more of the shortest wavelength of the visible band wavelength. Good.

  Further, the height H1 of the structural unit is not particularly limited, and the height H1 of all the structural units in the antireflection structure 3 may not necessarily be constant. However, the higher the height H1, the higher the visible light is. There is an advantage that the antireflection function is improved. Accordingly, the height H1 of the structural unit is at least the pitch P1 or more (the minimum structural unit height is at least the pitch), and at least three times the pitch P1 (the minimum structural unit height is three times the pitch). Or more). In view of the manufacturability of the antireflection structure 3 as described later, for example, it is desirable that the height H1 is up to a certain size, and is usually about 5 times or less of the pitch P1 (the largest structural unit). Is preferably about 5 times the pitch or less).

  In the present embodiment, as described above, the antireflection structure 3 may be a structure having a structural unit of, for example, a conical shape (FIG. 3A). In this case, for example, a conical antireflection structure 3 having a pitch of 0.15 μm and a height of 0.15 μm may be formed. This corresponds to a structural unit having a pitch of ½ or less of the visible band wavelength (400 nm to 700 nm) and a height equal to or higher than the pitch.

  However, the structure of the antireflection structure 3 is not necessarily limited to the conical structure shown in FIG. 3A. For example, the structural unit has a regular hexagonal pyramid shape or a pyramid shape such as a quadrangular pyramid shape (FIG. 3B). It may be a structure. In addition, the shape of such a structural unit is not necessarily limited to a cone shape, and a truncated cone shape (FIG. 5A) or a truncated pyramid shape even if the tip has a rounded bell shape (FIGS. 4A and 4B). A frustum shape such as (FIG. 5B) may be used. Moreover, each structural unit does not need to be a strict geometric shape, and may be substantially a cone shape, a bell shape, a frustum shape, or the like.

  Although there is no limitation in particular in the manufacturing method of the base material 2 which has the reflection preventing structure 3, the base material 2 can be manufactured as follows, for example. For example, after drawing a pattern on a quartz glass substrate or the like by a method such as electron beam drawing and performing a process such as dry etching, after forming a high-precision master mold that has been precisely machined into the same shape as the antireflection structure 3 in advance, The master mold is used to produce a glass antireflection structure molding die by press molding a heat-softened glass material, and the antireflection structure molding die is used, for example, for the acrylic resin or the like. For example, the material may be subjected to press molding. When such a method is adopted, the base material 2 having at least a part of the antireflection structure 3 can be manufactured at low cost and in large quantities. The thickness of the acrylic resin used for press molding is preferably about 0.05 mm or more.

  As described above, according to the present embodiment, when a third party touches the contact detection sensor and sebum, sweat, dirt on the skin, etc. adheres to the antireflection structure, the reflectance of the antireflection structure is increased. Increase. Thereby, it can be easily identified visually whether a third party has contacted the contact detection sensor.

  In the above embodiment, the case where the contact detection sensor is provided on at least a part of the surface of the magnetic card has been described as an example. However, an object (hereinafter referred to as a detection target object) provided with the contact detection sensor is Anything that is intended to detect contact by a third party may be used, and is not limited to a magnetic card. For example, the object to be detected may be a bankbook, insurance card, securities, or a sealed letter on which highly confidential information is recorded. Further, the object to be detected may be a storage case for storing the above magnetic card, passbook, and the like.

  When a third party touches the contact detection sensor provided on the object to be detected, the reflectance of the antireflection structure increases due to adhesion of sebum, etc., so that the owner touches the object to be detected. You can easily know what you did. As a result, since the owner can notice theft in a short time, the use of the passbook or the like can be quickly stopped, and monetary damage such as withdrawal of cash can be prevented. Thus, when using a contact detection sensor to confirm contact by a third party, the material of the base material is difficult to see and conspicuous like transparent materials such as the above-mentioned acrylic resin, polycarbonate resin, and polyethylene terephthalate resin. It is desirable to use materials.

  Moreover, although this embodiment demonstrated to the example the case where a contact detection sensor was used in order to detect a third party's contact, the use of a contact detection sensor is not restricted to this. For example, in order to objectively prove that there is no contact by a third party, the contact detection sensor according to the present invention can be used. As described above, in recent years, fraudulent acts such as disguise of food production areas have become a problem. On the other hand, by using the contact detection sensor according to the present invention, the antireflection structure whose reflectance does not change is not in contact with the detection target object provided with the contact detection sensor. It can be proof of. When a contact detection sensor is used for proof that there is no contact by a third party, the contact detection sensor may be affixed to a product such as food for which it is desired to prove that there is no impersonation. As in the case of detection, the object to be detected is not limited to products such as food, but may be a storage case for storing passbooks, insurance cards, securities, magnetic cards, magnetic cards, passbooks, and the like. .

  In addition, since the reflectance easily changes by adhesion of sebum etc., the antireflection structure of the substrate preferably has a protective film (see FIG. (Not shown) to prevent sebum adhesion. As the protective film, for example, smooth paper impregnated with a wax component such as paraffin can be used. Thereby, even if a user handles a contact detection sensor with a bare hand, the contact detection function which a contact detection sensor has is not impaired.

  Moreover, it is good also as providing the substantially flat area | region (henceforth a flat area | region) which does not provide an antireflection structure on the surface of a base material. FIG. 6 is a schematic perspective view of the contact detection sensor 1 provided with the flat region 5. The user grasps a flat area provided on the base material 2 and attaches a contact detection sensor to the detection target object. Thereby, the contact detection sensor 1 can be handled without impairing the contact detection function.

  In this embodiment, the case where the contact detection sensor is used as a single layer has been described as an example. However, the contact detection sensor may be used in a stacked manner. FIG. 7A is a schematic perspective view showing a state in which a plurality of contact detection sensors are stacked. As shown in FIG. 7A, three contact detection sensors 1 a to 1 c can be stacked in a peelable state to form one stacked contact detection sensor 10. In FIG. 7A, an example in which the laminated contact detection sensor 10 includes three layers is illustrated. Of course, the laminated contact detection sensor 10 may have two layers, or four or more layers. May be.

  FIG. 7B is an enlarged schematic perspective view of the single-layer contact detection sensor 1b shown in FIG. 7A. In FIG. 7B, a spacer member 6 is provided in the flat region 5 where the antireflection structure is not formed. The spacer member 6 is a support member for stacking the contact detection sensors. The height of the spacer member 6 is not less than the height H1 of the antireflection structure. By providing the spacer member 6, the contact detection sensor can be stacked without damaging the antireflection structure. Note that the spacer member 6 may not be provided in the uppermost contact detection sensor (the contact detection sensor 1a in the example of FIG. 7A). Further, the contact detection sensor 1c has the same configuration as the above-described contact detection sensor 1b. The spacer member 6 may be an adhesive that bonds the base material 2 and the upper pressure-sensitive adhesive layer 4 together.

  If the laminated contact detection sensor 10 as described above is used, the contact detection function can be easily achieved without removing the contact detection sensor 1 again by simply peeling the used contact detection sensors 1 in order from the top. Can be played. Therefore, the contact detection function can be efficiently reproduced without replacing the contact detection sensor 1.

  In addition, when using a laminated contact detection sensor, it is necessary to peel off the adhesion layer 4 of each contact detection sensor and the base material 2 of the lower layer contact detection sensor. Therefore, the base material that becomes the release surface from the adhesive layer 4 may be treated with a silicone-based release treatment agent or the like. Thereby, the adhesive layer 4 of a contact detection sensor and the base material 2 of the contact detection sensor in the lower layer can be peeled without damaging the antireflection structure. Moreover, it is good also as comprising the adhesive layer 4 with the adhesive material which can peel.

  Moreover, when using a laminated contact detection sensor, it is preferable to add a symbol 7 that can identify each contact detection sensor 1 for each layer (FIG. 7A). Thereby, after peeling a contact detection sensor, the number of remaining contact detection sensors can be grasped easily. Furthermore, preferably, in this case, a unique symbol 8 that can identify the stacked contact sensor is provided. Thereby, it is possible to prevent the entire contact detection sensor from being replaced by a third party.

(Second Embodiment)
The contact detection sensor according to the second embodiment of the present invention is tape-shaped. FIG. 8 is an enlarged schematic perspective view showing the contact detection sensor 11 according to the second embodiment of the present invention.

  The contact detection sensor 11 shown in FIG. 8 includes a base material 12 and an adhesive layer 14, and the base material 12 has an antireflection structure 13 on at least a part of its surface. The base material 12 is, for example, a tape shape having a width of 10 mm and a thickness of 0.05 mm, and is made of a transparent material such as an acrylic resin, a polycarbonate resin, or a polyethylene terephthalate resin, as in the first embodiment. Moreover, the thickness of the base material 2 should just be easy to handle and can obtain sufficient mechanical strength, However, Preferably, it is good in it being 0.05 mm or more.

  The base material 12, the antireflection structure 13, and the adhesive layer 14 according to the present embodiment correspond to the base material 2, the antireflection structure 3, and the adhesive layer 4 according to the first embodiment. In this embodiment, it is the same as that of 1st Embodiment except the contact detection sensor 11 being tape-shaped.

  The height and pitch of the antireflection structure 13 may be determined in the same manner as in the first embodiment. For example, when conical structural units having a pitch of 0.15 μm and a height of 0.15 μm are arranged in an array. Good. Moreover, there is no limitation in particular in the manufacturing method of the base material 12 which has the reflection preventing structure 13, For example, the manufacturing method similar to 1st Embodiment can be used.

  As described above, according to the present embodiment, since the contact detection sensor is in a tape shape, it can be cut as much as necessary according to the detection target object to which the contact detection sensor is attached. Further, since the contact detection sensor can be cut to a desired size, it can be used by being attached to a narrow place. Alternatively, the surface of the tape-shaped contact detection sensor may be wound with the surface covered with a protective film (not shown), and the tape may be attached to a tape holder and stored.

  In the present embodiment, as in the first embodiment, the flat region 15 may be provided on the surface of the substrate (FIG. 9A). Thereby, a contact detection sensor can be handled, without impairing a contact detection function.

  Also in the present embodiment, as in the first embodiment, a plurality of contact detection sensors can be stacked and used in a peelable state. In such a case as well, the spacer member 16 may be provided on the surface of the base material as in the first embodiment (FIG. 9B).

(Third embodiment)
In 1st and 2nd embodiment, although the case where the structural unit of the antireflection structural body which the base material of a contact detection sensor has was explained as an example, the shape of a structural unit is not limited to this, for example, It may be a depressed shape. In the contact detection sensor according to the third embodiment, the structural unit of the antireflection structure included in the base material has a depressed shape.

  FIG. 10 is an enlarged schematic perspective view of the contact detection sensor 21 according to the third embodiment of the present invention. The contact detection sensor 21 shown in FIG. 10 includes a base material 22 and an adhesive layer 24, and the base material 22 has an antireflection structure 23 on at least a part of its surface. The base material 22 is, for example, a sheet shape of 10 mm × 20 mm × 0.05 mm, and is made of a transparent material such as an acrylic resin, a polycarbonate resin, or a polyethylene terephthalate resin, as in the first embodiment. Moreover, the thickness of the base material 22 should just be easy to handle and can obtain sufficient mechanical strength, However, Preferably, it is good in it being 0.05 mm or more.

  The base material 22, the antireflection structure 23, and the adhesive layer 24 according to the present embodiment correspond to the base material 2, the antireflection structure 3, and the adhesive layer 4 according to the first embodiment. In this embodiment, except that the shape of the antireflection structure is a depressed shape, it is the same as that of the first embodiment. Therefore, the following description will focus on the differences, and the base material 22 and the adhesive layer 24 will be described. A detailed description of the constituent materials, possible modes of the antireflection structure 23, and the like will be omitted.

  FIG. 11 is a view showing the antireflection structure 23 provided on the base material 22 shown in FIG. As the antireflection structure 23 that can be used in this embodiment, for example, a conical depression hole having a depth D1 as shown in FIG. 11 is used as a structural unit, and these conical depression holes are periodically formed at a pitch P1. Examples of the structure are arranged in an array. Here, the depth D1 of the depression hole corresponds to the height H1 in the first embodiment. By periodically arranging the structural units having a predetermined shape in an array, the apparent refractive index is continuously changed for visible light, and the transmission / reflection characteristics at the interface with the air layer It is possible to form an antireflection functional surface with little incidence angle dependency and wavelength dependency.

  The depth D1 of the structural unit is not particularly limited, and the depth D1 of all the structural units in the antireflection structure 23 may not necessarily be constant. However, the deeper the depth D1, the more reflective the visible light. There is an advantage that the prevention function is improved. Accordingly, the depth D1 of the structural unit is at least the pitch P1 or more (the minimum structural unit depth is at least the pitch), and at least three times the pitch P1 (the minimum structural unit depth is three times the pitch). Or more). In consideration of manufacturability of the antireflection structure 23 as will be described later, for example, it is desirable that the depth D1 is up to a certain size, and is about 5 times or less the normal pitch P1 (the maximum structural unit depth). Is preferably about 5 times the pitch or less).

  In the present embodiment, as described above, the antireflection structure 23 may be a structure having a conical shape, for example, a conical shape (FIG. 11). In this case, for example, a conical antireflection structure 23 having a pitch of 0.15 μm and a depth of 0.15 μm may be formed. This corresponds to a structural unit having a pitch of ½ or less of the visible band wavelength (400 nm to 700 nm) and a depth of the pitch or more.

  However, the structure of the antireflection structure 23 is not necessarily limited to the conical structure shown in FIG. 11. For example, the structural unit is a structure having a pyramid shape such as a regular hexagonal pyramid shape or a quadrangular pyramid shape. May be. Further, the shape of the structural unit is not necessarily limited to the cone shape, and may be a bell shape with a rounded tip or a truncated cone shape such as a truncated cone shape or a truncated pyramid shape. Moreover, each structural unit does not need to be a strict geometric shape, and may be substantially a cone shape, a bell shape, a frustum shape, or the like.

  Although there is no limitation in particular in the manufacturing method of the base material 22 which has the reflection preventing structure 23, the base material 22 can be manufactured as follows, for example. For example, after a pattern is drawn on a quartz glass substrate or the like by a method such as electron beam drawing and processing such as dry etching is performed to form a high-precision master mold that has been precisely processed into the same shape as the antireflection structure 23 in advance, The master mold is used to produce a glass antireflection structure molding die by press molding a heat-softened glass material, and the antireflection structure molding die is used, for example, for the acrylic resin or the like. For example, the material may be subjected to press molding. When such a method is employed, the base material 22 having at least a part of the antireflection structure 3 can be manufactured at a low cost and in large quantities. The thickness of the acrylic resin used for press molding is preferably about 0.05 mm or more.

  As described above, according to the present embodiment, even when the structural unit of the antireflection structure has a depressed shape, sebum adheres to the antireflection structure of the contact detection sensor, as in the first embodiment. Then, the reflectance of the antireflection structure increases. Thereby, it can be easily identified visually whether a third party has contacted the contact detection sensor. Therefore, the contact by the third party can be easily confirmed by attaching the contact detection sensor to the object to be detected.

  In addition, since the reflectance easily changes by adhesion of sebum etc., the antireflection structure of the substrate preferably has a protective film (see FIG. (Not shown) to prevent sebum adhesion. Thereby, even if a user handles a contact detection sensor with a bare hand, the function of a contact detection sensor is not impaired.

  In the present embodiment, as in the first embodiment, a flat region 25 may be provided on the surface of the substrate (FIG. 12A). Thereby, a contact detection sensor can be handled, without impairing a contact detection function.

  Also in the present embodiment, as in the first embodiment, a plurality of contact detection sensors can be stacked and used in a peelable state. In such a case as well, as in the first embodiment, the spacer member 26 may be provided on the surface of the substrate (FIG. 12B).

  In the present embodiment, the case where the structural unit of the antireflection structure has a conical depression shape has been described as an example. However, the shape of the structural unit is not limited to a conical shape, for example, a conical shape on a plane It is also possible to use an antireflection structure formed such that depression-like structural units such as bells and frustums are periodically arranged in an array with a pitch smaller than the visible band wavelength. Further, the projecting-shaped structural unit and the depressed-shaped structural unit may be simultaneously present in one antireflection structural body. In addition, in the case of an antireflection structure in which such a projecting shape structural unit and a depressed shape structural unit exist at the same time, the sum of the height of the projected portion and the depth of the depressed portion is within the range of the height H1. Is preferred. Thus, in the antireflection structure used in this embodiment, each structural unit is periodically arranged in an array at a pitch smaller than the visible band wavelength, and can sufficiently prevent reflection of unnecessary light. If so, the shape of the structural unit is not particularly limited.

(Fourth embodiment)
The contact detection sensor according to the fourth embodiment of the present invention is tape-shaped. FIG. 13: is the schematic perspective view which expanded and showed the contact detection sensor in the 4th Embodiment of this invention.

  A contact detection sensor 31 shown in FIG. 13 includes a base material 32 and an adhesive layer 34, and the base material 32 has an antireflection structure 33 on at least a part of its surface. The base material 32 is, for example, a tape shape having a width of 10 mm and a thickness of 0.05 mm, and is made of a transparent material such as an acrylic resin, a polycarbonate resin, or a polyethylene terephthalate resin, as in the first embodiment. Moreover, the thickness of the base material 32 should just be easy to handle and can obtain sufficient mechanical strength, However, Preferably, it is good in it being 0.05 mm or more.

  The base material 32, the antireflection structure 33, and the adhesive layer 34 according to the present embodiment correspond to the base material 22, the antireflection structure 23, and the adhesive layer 24 according to the third embodiment. In this embodiment, it is the same as that of 3rd Embodiment except the contact detection sensor 31 being tape-shaped.

  The depth and pitch of the antireflection structure 33 may be determined in the same manner as in the third embodiment. For example, when conical structural units having a pitch of 0.15 μm and a depth of 0.15 μm are arranged in an array. Good. Moreover, there is no limitation in particular in the manufacturing method of the base material 32 which has the reflection preventing structure 33, For example, the manufacturing method similar to 3rd Embodiment can be used.

  As described above, according to the present embodiment, since the contact detection sensor is in a tape shape, it can be cut as much as necessary according to the detection target object to which the contact detection sensor is attached. Further, since the contact detection sensor can be cut to a desired size, it can be used by being attached to a narrow place. Alternatively, the surface of the tape-shaped contact detection sensor may be wound with the surface covered with a protective film (not shown), and the tape may be attached to a tape holder and stored.

  In the present embodiment, as in the first embodiment, a flat region 35 may be provided on the surface of the substrate (FIG. 14A). Thereby, a contact detection sensor can be handled, without impairing a contact detection function.

  Also in the present embodiment, as in the first embodiment, a plurality of contact detection sensors can be stacked and used in a peelable state. In such a case as well, the spacer member 36 may be provided on the surface of the substrate as in the first embodiment (FIG. 14B).

  Moreover, although the case where the base material of the contact detection sensor was made of a transparent material was described as an example in the first to fourth embodiments, the material constituting the base material is not limited to this. As described above, when the substrate is made of a transparent material, it is possible to detect contact with the detection target without being noticed by a third party. However, the base material may be an opaque material such as a polyolefin-based white material or a black material. For example, the base material made of a black material is a black dye obtained by mixing a pigment such as cyan, magenta, or yellow into a resin such as an acrylic resin, a polycarbonate resin, or a polyethylene terephthalate resin (for example, Plast Black 8950, Plast Black 8970). (Both are trade names, manufactured by Arimoto Chemical Industry Co., Ltd.)) and pigments such as carbon black. When a black material is used as the base material, in addition to the effect of using an opaque material, the contrast between the part to which sebum or the like is attached and the part to which no sebum is attached is increased. Thereby, the effect that it becomes possible to confirm the contact by the third party more easily can be obtained.

  Moreover, even when using for the purpose of concealing presence of a contact detection sensor, it is not limited to when a base material consists of transparent materials. In this case, it is preferable that the color of the base material is the same color, the same color, or a similar color as the color of the detection target object.

  On the other hand, when the base material is a conspicuous color, it can be determined at a glance that the contact detection sensor is provided on the detection target object, so that a threatening effect to a third party can be obtained. Therefore, contact by a third party can be prevented in advance. When using for the purpose of making a contact detection sensor stand out, it is preferable that the color of a base material is a color opposite to the color of a to-be-detected object, or a quasi-opposite color. The opposite colors are also called complementary colors, which are two colors that have an achromatic color when mixed. The complementary colors are, for example, white and black, yellow and blue, red and blue-green, and the like. In addition, the quasi-opposite color is a color adjacent to the opposite color that is diagonal to one color in the hue circle. For example, on the basis of “red”, “green” on the opposite side of red in the 6-color circle is the opposite color, “orange” and “purple” next to red are similar colors, “yellow” and “blue” Becomes a semi-opposite color. In addition, the color of the substrate is not limited to the opposite color or the quasi-opposite color of the object to be detected, and may be a marker color such as red or green, and the saturation and brightness are conspicuous. It may be a color or a color that catches the eye, such as a primary color or a fluorescent color.

  In the first to fourth embodiments, the pitch of the structural unit of the antireflection structure has been described as an example where the pitch is smaller than the visible band wavelength. However, the pitch and height of the structural unit of the antireflection structure are as follows. The color of the substrate or the color of the object to be detected to which the contact detection sensor is attached may be appropriately determined. For example, when the color of the base material is red, the pitch is preferably smaller than 640 to 770 nm, and when the color of the base material is blue, the pitch is preferably smaller than 430 to 490 nm. Moreover, when a base material consists of transparent materials, it is good to determine a pitch according to the color of the to-be-detected target object to which a contact detection sensor is stuck. For example, when the color of the object to be detected is green, the pitch is preferably smaller than 490 to 550 nm, and when the color of the base material is yellow, the pitch is preferably smaller than 550 to 590 nm.

  In the first to fourth embodiments, the case where the base material of the contact detection sensor is made of a resin material has been described as an example. However, the material constituting the base material is not limited to resin, and examples thereof include aluminum, brass, and stainless steel. Metals such as steel, copper, and other alloys may be used. In the first to fourth embodiments, the case where the adhesive layer is formed on the back surface of the base material has been described as an example. However, the adhesive layer is not necessarily formed, and the base material, the detection target object, May be adhered with an adhesive or the like.

  In the first to fourth embodiments, the case where the contact detection sensor is attached to the detection target object has been described as an example. However, the antireflection structure included in the contact detection sensor on the base material constituting the detection target object. It is good also as forming a body. Thereby, the base material demonstrated above comprises a part of surface of a to-be-detected target object, and a contact detection sensor can be integrally shape | molded with respect to a to-be-detected target object. Therefore, a contact detection function can be imparted to the object to be detected without attaching a contact detection sensor.

  In the first to fourth embodiments, the case where the contact detection sensor is used for confirming contact by a third party has been described as an example. However, the following uses are also conceivable. . For example, by tracing the surface of the contact detection sensor 1 with a finger, it is possible to write characters or draw a simple picture on the surface of the contact detection sensor 1.

  INDUSTRIAL APPLICABILITY The present invention is useful as an inexpensive contact detection sensor and contact detection method that can easily detect contact by a third party.

The figure which shows the example of application of the contact detection sensor which concerns on 1st Embodiment. The schematic perspective view which expanded a part of contact detection sensor 1 shown in FIG. FIG. 4 is a schematic enlarged view showing an example of the antireflection structure 3, and is a diagram of a structure having a conical structure unit FIG. 4 is a schematic enlarged view showing an example of the antireflection structure 3 and a structure in which the structural unit is a pyramid shape. FIG. 5 is a schematic enlarged view showing an example of the antireflection structure 3 and shows a structure in which the structural unit is a bell-shaped structure. FIG. 5 is a schematic enlarged view showing an example of the antireflection structure 3 and shows a structure in which the structural unit is a bell-shaped structure. FIG. 3 is a schematic enlarged view showing an example of the antireflection structure 3 and a structure whose structural unit is a truncated cone shape. FIG. 5 is a schematic enlarged view showing an example of the antireflection structure 3 and a structure whose structural unit is a truncated pyramid shape. Schematic perspective view of the contact detection sensor 1 provided with a flat region 5 Schematic perspective view showing a state where a plurality of contact detection sensors are stacked. The schematic perspective view which expanded the single layer contact detection sensor 1b shown to FIG. 7A. The schematic perspective view which expanded and showed the contact detection sensor 11 in 2nd Embodiment. Schematic perspective view of the contact detection sensor 11 provided with a flat region 15 Schematic perspective view of the contact detection sensor 11 provided with the spacer member 16 The schematic perspective view which expanded and showed the contact detection sensor 21 in 3rd Embodiment. The figure which shows the antireflection structure 23 provided in the base material 22 shown in FIG. Schematic perspective view of the contact detection sensor 21 provided with a flat region 25 Schematic perspective view of the contact detection sensor 21 provided with the spacer member 26 The schematic perspective view which expanded and showed the contact detection sensor 31 in 4th Embodiment. Schematic perspective view of the contact detection sensor 31 provided with a flat region 35 Schematic perspective view of the contact detection sensor 31 provided with the spacer member 36

Explanation of symbols

1, 10, 11, 21, 31 Contact detection sensor 2, 12, 22, 32 Base material 3, 13, 23, 33 Antireflection structure 4, 14, 24, 34 Adhesive layer 5, 15, 25, 35 Flat region 6, 16, 26, 36 Spacer member 7, 8 Symbol

Claims (27)

A sensor that makes it possible to identify the presence or absence of human contact with an object to be detected,
An antireflection structure in which structural units having a predetermined shape are periodically arranged in an array at a pitch smaller than a visible band wavelength; and
A substrate having the antireflection structure on at least a part of the surface,
The contact detection sensor according to claim 1, wherein the antireflection structure makes it possible to identify the presence or absence of contact of the human body based on a change in reflectance at a portion where the human body has contacted.   The contact detection sensor according to claim 1, wherein the base material constitutes at least a part of a surface of the detection target object.   The contact detection sensor according to claim 1, wherein the base material is formed in a sheet shape.   Furthermore, the contact detection sensor of Claim 3 provided with the adhesion layer formed in the back surface of the said base material, and adhere | attaches the said base material and the said to-be-detected target object.   The contact detection sensor according to claim 1, wherein the base material is formed in a tape shape.   Furthermore, the contact detection sensor of Claim 5 provided with the adhesion layer formed in the back surface of the said base material, and adhere | attaches the said base material and the said to-be-detected target object.   The contact detection sensor according to claim 1, wherein the structural unit of the antireflection structure has a substantially conical protruding shape and / or a substantially conical depressed structure.   The contact detection sensor according to claim 1, wherein the structural units of the antireflection structure are periodically arranged in an array at a pitch of ½ or less of a visible band wavelength.   The contact detection sensor according to claim 1, wherein the structural unit of the antireflection structure has a height or a depth of at least a pitch or more.   The contact detection sensor according to claim 1, wherein the structural unit of the antireflection structure has a height or a depth that is at least three times the pitch.   The contact detection sensor according to claim 1, wherein a top surface shape or a bottom surface shape of the structural unit of the antireflection structure is one selected from the group consisting of a substantially circular shape, a substantially rectangular shape, and a substantially regular hexagonal shape.   The contact detection sensor according to claim 3, wherein the contact detection sensor has a substantially flat region on at least a part of a surface of the base material.   The contact detection sensor according to claim 5, wherein the contact detection sensor has a substantially flat region on at least a part of the surface of the base material.   The contact detection sensor according to claim 1, wherein the base material is made of a transparent material.   The contact detection sensor according to claim 1, wherein the base material is made of an opaque material.   The contact detection sensor according to claim 1, wherein the base material is made of a black material.   The contact detection sensor according to claim 3, wherein a color of the base material is the same color, a similar color, or a similar color as a color of the detection target object.   The contact detection sensor according to claim 5, wherein a color of the base material is the same color, a similar color, or a similar color as a color of the detection target object.   The contact detection sensor according to claim 3, wherein a color of the base material is a color opposite or quasi-opposite to a color of the detection target object.   The contact detection sensor according to claim 5, wherein a color of the base material is a color opposite or quasi-opposite to a color of the detection target object.   The contact detection sensor according to claim 3, wherein a plurality of base materials having the antireflection structure body on at least a part of a surface thereof are stacked, and the base materials are stacked in a peelable state.   The contact detection sensor according to claim 5, wherein a plurality of base materials having the antireflection structure body on at least a part of a surface are stacked, and the base materials are stacked in a peelable state.   The contact detection sensor according to claim 21, wherein a symbol that can identify each of the stacked base materials is given to the base material.   The contact detection sensor according to claim 22, wherein a symbol that can identify each of the stacked base materials is given to the base material.   The contact detection sensor according to claim 21, wherein a symbol that can identify the stacked contact detection sensor on which the base material is stacked is given.   The contact detection sensor according to claim 22, wherein a symbol that can identify the stacked contact detection sensor on which the base material is stacked is given. A contact detection method that makes it possible to identify the presence or absence of human contact with an object to be detected,
An antireflection structure in which structural units having a predetermined shape are periodically arranged in an array at a pitch smaller than the visible band wavelength is arranged in advance on at least a part of the detection target object,
A contact detection method that makes it possible to identify the presence or absence of contact of the human body based on a change in reflectance of the antireflection structure at a portion where the human body has contacted.

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