JP4747294B2 - RFID tag - Google Patents

Description

  The present invention relates to an RFID tag in a radio frequency identification (RFID) system that communicates data without contact.

  2. Description of the Related Art Conventionally, medical endoscopes that insert an elongated insertion portion into a body cavity and observe an organ in the body cavity have been widely used. In such a medical instrument, cleaning for disinfection and sterilization is necessary to prevent infection and the like, and in particular, since an endoscope is used for observing various parts of various patients, Cleaning suitable for the purpose of use is necessary. In addition, it is necessary to manage how the used endoscope has been cleaned.

  Therefore, conventionally, a barcode on which information for identifying the endoscope is recorded is attached to a predetermined position of the endoscope, and a barcode reader is attached to a cleaning device for cleaning the endoscope. A method has been used in which a barcode is read by a barcode reader before the endoscope is cleaned by a cleaning device, and cleaning is performed under conditions suitable for the endoscope specified by the barcode. However, in the case of a method using a barcode, there are cases where reading cannot be performed if foreign matter adheres to the surface of the barcode, and since the amount of information that can be recorded with a barcode is small, there are many cleaning conditions and the like. There was a problem that could not be recorded in the barcode.

  In order to solve the above problem, the following Patent Document 1 discloses an insertion portion composed of a distal end constituting portion such as an elongated snake tube inserted into the body or an observation optical system provided at the distal end thereof, and a proximal end portion of the insertion portion. In an endoscope composed of an operated operation unit, a light guide cable for introducing light into the operation unit, and a connector unit disposed at the other end of the light guide cable, for example, the distal end of the insertion unit, the center of the snake tube RFID tag is affixed to various parts of the endoscope such as the head portion, the operation portion, the center portion of the light guide cable, and the connector portion, and the endoscope model name and snake tube stored in the IC of the RFID tag using a reader And read the information such as the length of the light guide cable, the correct installation position of the tip component, resistance to ultrasonic waves, etc., and select the optimal ultrasonic cleaning pattern for the endoscope based on the read information and perform cleaning Cormorant endoscope washing apparatus is disclosed.

JP 2002-272684 A (page 3-8, FIG. 2)

  As described above, it is possible to set and manage the cleaning conditions of the endoscope by attaching the RFID tag to various parts of the endoscope. In Patent Document 1, the RFID tag is attached to the surface of the endoscope. Since the RFID tag comes into contact with the cleaning liquid during cleaning, the RFID tag antenna pattern may be corroded or the IC may be damaged. Even when the RFID tag is protected by a film or the like, the film may be damaged due to contact with the cleaning device while cleaning is repeated, and the cleaning liquid may penetrate, or the IC may be damaged by contact with the cleaning device. It can happen.

  As a method for solving such a problem, a method of incorporating an RFID tag in the endoscope is conceivable, but the endoscope is made of various materials, and in particular, an operation mechanism unit for moving a snake tube in the operation unit. Since a metal material is generally used for such an operation mechanism unit, when an RFID tag is incorporated in an endoscope, the inductance of the RFID tag antenna is caused by the metal material or the like. As a result, the resonance frequency and the Q value change accordingly, causing problems such as a short communication distance and inability to communicate.

  The present invention has been made in view of the above problems, and its main purpose is to suppress a change in resonance frequency and Q value even in a case where the device is incorporated in a device containing a metal material, thereby achieving a good communication state. It is an object of the present invention to provide an RFID tag capable of ensuring the above.

In order to achieve the above object, the present invention provides an RFID tag used in an RFID system that performs data communication in a non-contact manner, and includes a substantially disk-shaped substrate having at least a loop-shaped antenna, and the substrate substantially And a magnetic sheet having a circular shape that connects two points on the circumference and a magnetic sheet that is surrounded by a straight line. The components of the RFID tag are stored in a coin-shaped container. And the component is fixed to the inside of the container by a resin, and has an opening at a substantially center of the substrate, and the substrate and the magnetic sheet adjacent to the substrate are fixed by the resin in the opening. is a shall.

The present invention also relates to an RFID tag used in an RFID system that performs data communication in a non-contact manner, and includes a substantially disc-shaped substrate having at least a loop-shaped antenna, and a disc having a diameter substantially equal to the substrate. A magnetic sheet having a circular arc connecting two points on the circumference and a region surrounded by a straight line, and a disk-shaped spacer having a diameter substantially equal to that of the substrate are laminated in this order. The component parts of the RFID tag are stored in a coin-shaped container, and the component parts are fixed inside the container with resin, and an opening is provided in the approximate center of the substrate. and said magnetic sheet adjacent to the substrate is shall be fixed by the resin.

The present invention also relates to an RFID tag used in an RFID system that performs data communication in a non-contact manner, and includes a substantially disc-shaped substrate having at least a loop-shaped antenna, and a disc having a diameter substantially equal to the substrate. And a magnetic sheet having a disc shape having a diameter substantially equal to that of the substrate and having a circular arc connecting two points on the circumference and a region surrounded by a straight line, are laminated in this order. The component parts of the RFID tag are stored in a coin-shaped container, and the component parts are fixed inside the container with resin, and an opening is provided in the approximate center of the substrate. and said spacer adjacent to the substrate is shall be fixed by the resin.

  Further, in the present invention, the notch of the magnetic sheet is arranged so that the variation in the inductance of the antenna due to the metal material inside the device in which the RFID tag is incorporated is offset from the variation in the inductance of the antenna due to the magnetic sheet. The position may be set, and the device is preferably an endoscope.

  As described above, according to the configuration of the present invention, even when the RFID tag is incorporated in an apparatus including a metal material such as an endoscope, the influence of the metal material can be suppressed by the magnetic sheet, and the magnetic property can be reduced. Since the change of the resonance frequency and the Q value can be suppressed by adjusting the position of the cutout of the sheet, a good communication state can be ensured.

  According to the RFID tag of the present invention, it is possible to ensure a good communication state by suppressing changes in the resonance frequency and the Q value even when incorporated in a device including a metal material such as an endoscope. it can.

  The reason is that the RFID tag is a substantially circular substrate having at least a loop-shaped antenna pattern and a disk shape having a diameter substantially equal to the substrate, and is surrounded by an arc and a straight line connecting two points on the circumference. Since the magnetic sheet is arranged between the metal material and the substrate, the magnetic sheet can suppress the influence of the metal member, and the magnetic sheet This is because by adjusting the notch position, it is possible to cancel the decrease in the inductance of the antenna due to the metal material and the increase in the inductance due to the magnetic sheet, thereby suppressing changes in the resonance frequency and the Q value.

  In addition, by arranging a spacer having a predetermined thickness between the magnetic sheet and the metal material or between the substrate and the magnetic sheet, the influence of the metal material and the magnetic sheet can be suppressed. This is because the influence of the metal material and the influence of the magnetic sheet can be surely offset by adjusting the notch position of the sheet.

  As a result, the RFID tag is not affected by processing on the device such as cleaning, as in the case where the RFID tag is attached to the outside of the device, and the conventional RFID tag is attached inside the device, It is possible to prevent problems such as the communication distance being shortened or communication impossible due to the influence of the metal material. Furthermore, since a notch part can be formed only by cutting out a part of the circumference of a magnetic sheet with one straight line, workability can be improved remarkably.

  As shown in the prior art, RFID tags are used for applications such as cleaning and management of endoscopes. However, when RFID tags are attached to the surface of equipment, RFID tags are used during processing such as cleaning. May be damaged. On the other hand, when an RFID tag is incorporated inside a device, the inductance of the antenna changes due to the influence of the component materials inside the device, particularly metal materials, and the resonance frequency and Q value change accordingly and the communication distance decreases. Problems such as communication failure.

  More specifically, since the RFID system generally adjusts the resonance frequency of the RFID tag so as to have a preset communication frequency and communicates with the reader at the communication frequency, for example, as shown in FIG. As described above, there is a problem that the distance in which communication with the reader can be shortened as the resonance frequency of the RFID tag deviates from a preset communication frequency (here, approximately 13.7 MHz).

  In response to this problem, a method such as forming a dedicated RFID tag whose resonance frequency has been changed in advance in anticipation of the influence of components inside the device, or forming an inductance adjustment pattern in advance in the resonance circuit of the RFID tag, etc. However, the former cannot use a general-purpose RFID tag, resulting in an increase in cost. In the latter, the workability is poor because fine work is required when adjusting the resonance frequency. There is.

  Therefore, in the present invention, an RFID tag is made up of a substantially disk-shaped substrate having at least a loop-shaped antenna pattern and an IC, and a disk-shaped sheet-shaped magnetic body (hereinafter referred to as magnetic material) having a diameter substantially equal to the substrate. The magnetic sheet is arranged between the metal material inside the device and the substrate, and the magnetic sheet is cut out by one straight line connecting two points on the circumference. Make it easy to adjust the inductance. As a result, even when a metal member or the like is disposed inside the device, the influence can be suppressed by the magnetic sheet, and the decrease in the inductance of the antenna due to the metal material and the increase in the inductance due to the magnetic sheet are offset. By setting the notch position in this way, it is possible to compensate for changes in the resonance frequency and the Q value and to ensure a good communication state.

  In order to describe the above-described embodiment of the present invention in more detail, an RFID tag according to a first example of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a general configuration of an RFID system, and FIG. 2 is a diagram showing an example of the structure of an endoscope incorporating the RFID tag of this embodiment. 3 and 4 are diagrams showing the structure of the RFID tag according to the present embodiment, and FIGS. 5 and 6 are diagrams showing variations thereof. FIG. 7 is a diagram showing the correlation between the width of the notch and the resonance frequency.

  As shown in FIG. 1, generally, an RFID system 1 includes a tag 2 incorporated in a device such as an endoscope, and a reader or reader / writer (hereinafter referred to as a reader / writer 5) that communicates with the tag 2. Consists of. The tag 2 includes a resonance circuit 3 including an antenna 3 and a capacitor, and an IC 4 that stores information about a device in which the tag 2 is incorporated, identification information of the tag 2, and the like. The reader / writer 5 A reader / writer antenna 5a for communicating with the tag 2 and a control means such as a communication circuit unit 5b for converting transmission / reception signals and an arithmetic processing unit 5c for decoding transmission / reception signals.

  As shown in FIG. 2 (a), the endoscope 6 incorporating the tag 2 is composed of a long and narrow snake tube 7a inserted into the body, a distal end constituting portion 7b such as an observation optical system provided at the distal end thereof, and the like. An operation provided with an insertion portion 7 and an operation mechanism portion 8b connected to the insertion portion 7 for moving the snake tube 7a and the tip constituting portion 7b, and provided with an insertion port for inserting a processing tool such as forceps on the side surface thereof. A light guide cable 9 for introducing light emitted from a light source device (not shown) into the operation unit 8, a connector portion 10 for connecting the light guide cable 9 and the light source device, and the like. The tag 2 of the present embodiment is incorporated in a predetermined position of the endoscope 6, for example, inside the housing 8 a of the handle portion of the operation unit 8 as shown in FIG. Note that the endoscope 6 in FIG. 2A is merely an example, and the type and structure thereof are not limited. Moreover, the tag 2 should just be integrated in the component of the endoscope 6, and the kind of component and the position where the tag 2 is incorporated are not limited. However, the tag 2 is attached to the inner end of the component including the metal material. When incorporated, a remarkable effect is obtained.

  In addition, as shown in FIG. 3A, the tag 2 of the present embodiment is formed with an antenna pattern 3a having a loop of one turn or more, and a substantially circular plate on which an IC 4 connected to the antenna pattern 3a is arranged. 3b, and a cutout portion 2c having a disk shape with a diameter substantially equal to that of the substrate 2a and surrounded by an arc and a straight line connecting two points on the circumference, as shown in FIG. (The width (W) of the notch 2c will be described later) and the magnetic sheet 2b.

  Note that the material and thickness of the substrate 2a, the number and interval of turns of the antenna pattern 3a, the shape, the arrangement of the IC 4 and the like are not particularly limited. In FIG. 3 (a), the resonance circuit 3 is formed by the antenna pattern 3a and the capacitor built in the IC 4, but a capacitor is formed by arranging electrodes with the substrate 2a interposed therebetween. A resonance circuit may be configured with the pattern 3a, and modifications such as forming the antenna pattern 3a on both surfaces of the substrate 2a are possible. In FIG. 3, the substrate 2 a and the magnetic sheet 2 b are substantially disk-shaped, but the shape of the substrate 2 a and the magnetic sheet 2 b is the shape of a device that incorporates the tag 2 (here, the operation unit 8 of the endoscope 6). In addition, it can be changed to a rectangle, polygon, or ellipse.

  The thickness of the magnetic sheet 2b is determined in consideration of the space inside the component into which the tag 2 is incorporated, the arrangement of the metal material, the workability of the notch 2c, and the like. For example, in order to suppress the influence of the metal material in the vicinity of the tag 2, the magnetic sheet 2b may be thickened. However, if the magnetic sheet 2b is thickened, a space is required and the magnetic sheet 2b is difficult to cut. Become. Therefore, it can be said that the thickness of the magnetic sheet 2b is preferably as thin as possible as long as the influence of the metal material arranged in the vicinity of the tag 2 can be suppressed.

  The magnetic sheet 2b includes, for example, amorphous foil, laminated material of amorphous foil, metal powder, carbonyl iron powder, reduced iron powder, atomized powder (iron containing pure iron, Si, Cr, Al, etc., permalloy, Co-Fe, etc. Powder), amorphous (powder containing iron, cobalt, nickel alloy containing B, P, Si, etc., or powder obtained by gas atomization) or the like, and composite materials of flakes and organic substances such as plastics and rubbers are preferable. .

  Further, the composite material can be formed by repeatedly applying / drying a coating material containing flakes or granular powder on a film after the granular powder is flattened by an attractor, a ball mill, a stamp mill or the like to form flakes. At that time, by applying a magnetic field during coating, the flakes can be oriented in a certain direction, and the characteristics can be improved.

  In addition, as the plastic in the composite material, a thermoplastic plastic having good processability can be used, or a thermosetting plastic having a good heat resistance can be used. In addition, acrylic, polyester, polyvinyl chloride, Resins such as polyethylene, polystyrene, and epoxy can also be used.

  Then, as shown in FIG. 4, the substrate 2a and the magnetic sheet 2b are arranged such that the magnetic sheet 2b is arranged on the metal material side (for example, in the case of FIG. 2B, an operation mechanism containing a metal material). The tag 2 is formed by combining the magnetic sheet 2b on the portion 8b side and the substrate 2a on the housing 8a side made of non-metal such as plastic.

  At that time, the substrate 2a and the magnetic sheet 2b may be directly bonded using an adhesive or the like. For example, as shown in FIG. 4C, a predetermined container 11a (for example, PPS (polyphenylene sulfide resin) is used. ), The magnetic sheet 2b and the substrate 2a are disposed, the surface thereof is sealed with a resin 12 such as epoxy, and the tag 2 is formed by covering with a predetermined lid 11b (for example, a PPS lid). In the latter structure, chemical resistance and impact resistance can be improved.

  3 and 4, the inner side of the substrate 2a is cut out to form a donut shape, but it may be formed into a disk shape as shown in FIG. However, when the tag 2 is sealed in the container as described above, the magnetic sheet 6 can be exposed at the center portion by making the substrate 2 a doughnut-shaped, and when sealing with the resin 12, the substrate 2 a. And the magnetic sheet 2b can be fixed.

  As described above, the tag 2 includes the substrate 2a and the magnetic sheet 2b, and the magnetic sheet 2b and the substrate 2a are arranged in this order from the metal material side, whereby the influence of the metal material can be suppressed by the magnetic sheet 2b. However, by bringing the magnetic sheet 2b close to the antenna pattern 3a, the inductance of the antenna increases due to the influence of the magnetic sheet 2b, and the resonance frequency and the Q value are shifted. Therefore, in this embodiment, the notch 2c is provided in the magnetic sheet 2b to cancel the decrease in inductance due to the influence of the metal material and the increase in inductance due to the magnetic sheet 2b, thereby suppressing the deviation of the resonance frequency and the Q value, The notch 2c is easily formed by forming the notch 2c with a single straight line.

  3 and 4, the notch 2c is provided at one place on the magnetic sheet 6. However, the notch 2c is not limited to one, and as shown in FIG. ) May be provided with a notch 2c. 3 and 4, the IC 4 of the substrate 2a is on the upper side and the cutout portion 2c of the magnetic sheet 2b is on the right side. However, the positional relationship between the IC4 of the substrate 2a and the cutout portion 2c of the magnetic sheet 2b is particularly limited. Not.

  The width of the notch 2c (W in FIG. 3B) takes into consideration the arrangement of the metal material, the distance between the antenna pattern 3a and the metal material or the magnetic sheet 2b, the physical properties of the metal material or the magnetic sheet 2b, and the like. However, how the resonance frequency changes according to the width of the notch 2c was measured. The result is shown in FIG.

  In the measurement, the substrate 2a having a diameter of 27.2 mm and the antenna pattern 3a wound four times at a position of 10 mm to 12 mm from the center was used. The magnetic sheet 2b has a diameter of 27 mm, and four types of samples are prepared in which the width of the notch 2c (W in FIG. 3B) is set to 1.5 mm, 2.0 mm, 2.5 mm, and 3.5 mm. did. And various samples were arrange | positioned in the position of 1 mm on a metal plate, and the resonant frequency was measured.

  FIG. 7 shows that the resonance frequency gradually increases as the width of the cutout portion 2c increases as the overall tendency is observed. This is because the effect of increasing the inductance by the magnetic sheet 2b is suppressed and the effect of decreasing the inductance by the metal material is increased as the width of the notch 2c is increased. Therefore, if the correlation between the width of the notch 2c and the resonance frequency is obtained in advance and the value of the resonance frequency when the tag 2 is incorporated in the device is measured, the notch for obtaining the desired resonance frequency is obtained. The width of the portion 2c can be determined, and if the magnetic sheet 2b is linearly cut using a cutter or the like at the position of the width, the tag 2 suitable for the device can be easily created.

  In this way, the tag 2 has a substantially circular substrate 2a having at least the loop-shaped antenna pattern 3a and the IC 4, and a disk shape having a diameter substantially equal to the substrate 2a, and includes two points on the circumference. The tag 2 includes a metal material such as an endoscope by arranging the magnetic sheet 2b and a magnetic sheet 2b in which a region surrounded by a circular arc and a straight line are cut out and arranging the magnetic sheet 2b and the substrate 2a in this order from the metal material side. Even when incorporated inside the device, the influence of the metal material can be suppressed by the magnetic sheet 2b, and by adjusting the width of the notch 2c of the magnetic sheet 2b, the inductance of the antenna due to the metal material can be reduced. Since an increase in inductance due to the magnetic sheet 2b can be offset and changes in the resonance frequency and Q value can be suppressed, a good communication state can be ensured.

  Next, an RFID tag according to a second embodiment of the present invention will be described with reference to FIGS. 8 and 9 are diagrams showing the structure of the RFID tag according to the present embodiment, and FIG. 10 is a diagram showing the correlation between the spacer thickness and the resonance frequency.

  In the first embodiment described above, the tag 2 is composed of the substrate 2a and the magnetic sheet 2b. However, the influence of the metal material or the magnetic sheet 2b is such that the distance between the antenna pattern 3a and the metal material or the magnetic sheet 2b becomes smaller. growing. Therefore, for example, depending on the arrangement of the component members inside the device, a decrease in inductance due to the metal material and an increase in inductance due to the magnetic sheet 2b increase, and the resonance frequency may not be adjusted by the width of the notch 2c. .

  Therefore, in this embodiment, a spacer having a predetermined thickness is disposed between the magnetic sheet 2b and the metal material, or between the substrate 2a and the magnetic sheet 2b, and the distance between the antenna pattern 3a and the metal material or the magnetic sheet 2b. By increasing the width, the influence is suppressed, and by adjusting the width of the notch 2c, it is possible to surely cancel the change in inductance.

  Specifically, when the influence of the metal material is large, as shown in FIG. 8, the substrate 2a having at least the loop-shaped antenna pattern 3a and the IC 4 and a disk shape having a diameter substantially equal to the substrate 2a The tag 2 is composed of a magnetic sheet 2b in which a region surrounded by an arc and a straight line connecting two points on the circumference is cut out, and a disk-like spacer 2d having a diameter substantially equal to that of the substrate 2a. These are combined so that the spacer 2d, the magnetic sheet 2b, and the substrate 2a are arranged in this order.

  When the influence of the magnetic sheet 2b is large, as shown in FIG. 9, a substrate 2a having at least a loop-shaped antenna pattern 3a and an IC 4, a disk-shaped spacer 2d having a diameter substantially equal to the substrate 2a, The tag 2 is constituted by a magnetic sheet 2b having a circular plate shape having a diameter substantially equal to that of the substrate 2a and having a circular arc connecting two points on the circumference and a region surrounded by a straight line. These are combined so that the sheet 2b, the spacer 2d, and the substrate 2a are arranged in this order.

  The material of the spacer 2d is not particularly limited, and any material other than a metal material or a magnetic material may be used, and plastic, urethane foam, or the like can be used. In FIG. 8, the spacer 2d is disposed between the magnetic sheet 2b and the metal material. In FIG. 9, the spacer 2d is disposed between the magnetic sheet 2b and the substrate 2a. The spacer 2d may be disposed between the magnetic sheet 2b and the substrate 2a.

  Similarly to the first embodiment, the material and thickness of the substrate 2a, the number and interval of turns of the antenna pattern 3a, the shape, the arrangement of the IC4, the thickness of the magnetic sheet 2b, and the cutouts of the IC4 and the magnetic sheet 2b of the substrate 2a. There are no particular restrictions on the positional relationship of the portions 2c, the width, the number, etc. of the notches 2c. In addition, the substrate 2a, the magnetic sheet 2b, and the spacer 2d can be changed to a rectangle, a polygon, or an ellipse according to the shape of the device in which the tag 2 is incorporated (here, the operation unit 8 of the endoscope 6). Is possible. Further, the substrate 2a, the magnetic sheet 2b, and the spacer 2d may be directly bonded using an adhesive material or the like, or the spacer 2d, the magnetic sheet 2b, and the substrate are placed in a predetermined container 11a as in FIG. 2a may be arranged, the surface thereof may be sealed with a resin 12 such as epoxy, and the tag 2 may be formed by covering with a predetermined lid 11b.

  The thickness of the spacer 2d is set in consideration of the arrangement of the metal material, the thickness of the substrate 2a, the physical properties of the metal material and the magnetic sheet 2b, etc., but how the resonance frequency varies depending on the thickness of the spacer 2d. Measured what to do. The result is shown in FIG.

  In the measurement, the substrate 2a having a diameter of 27.2 mm and the antenna pattern 3a wound four times at a position of 10 mm to 12 mm from the center was used. Further, the magnetic sheet 2b had a diameter of 27 mm, and the width of the cutout portion 2c was set to 0 mm (corresponding to no cutout portion 2c), 2.5 mm, and 5.0 mm. And when the sample of each said condition is directly set | placed on a metal plate (equivalent to the spacer 2d absence in the structure of FIG. 8), and the case where it arrange | positions in the position of 1 mm on a metal plate (thickness 1mm of the spacer 2d of FIG. 8). And the case where the tag 2 is sufficiently separated from the metal plate (corresponding to the infinite thickness of the spacer 2d in FIG. 8), the resonance frequency was measured.

  FIG. 10 shows that the resonance frequency gradually decreases as the thickness of the spacer 2d increases. This is because, as the thickness of the spacer 2d is increased, the effect of reducing the inductance by the metal material is suppressed, and the effect of increasing the inductance by the magnetic sheet 2b is increased. Accordingly, the correlation between the thickness of the spacer 2d and the resonance frequency and the correlation between the width of the notch 2c and the resonance frequency are obtained in advance, and the value of the resonance frequency when the tag 2 is incorporated into the device is measured. For example, it is possible to determine the thickness of the spacer 2d and the width of the notch portion 2c to obtain a desired resonance frequency, insert the spacer 2d having that thickness, and linearly cut the magnetic sheet 2b at the position of the width. By doing so, the tag 2 suitable for the device can be easily created.

  As described above, the tag 2 has a substantially circular substrate 2a having at least the loop-shaped antenna pattern 3a and the IC 4, and a disk shape having a diameter substantially equal to the substrate 2a, and connects two points on the circumference. It is composed of a magnetic sheet 2b in which a region surrounded by an arc and a straight line is cut out, and a disk-like spacer 2d having a diameter substantially equal to that of the substrate 2a. From the metal material side, the spacer 2d, the magnetic sheet 2b, and the substrate 2a are arranged in this order. Alternatively, by arranging the magnetic sheet 2b, the spacer 2d, and the substrate 2a in this order, the magnetic sheet 2b suppresses the influence of the metal material even when the tag 2 is incorporated in a device including a metal material such as an endoscope. In addition, by adjusting the width of the notch 2c of the magnetic sheet 2b and the thickness of the spacer 2d, the inductance of the antenna due to the metal material can be reduced and the magnetic sheet It is possible to suppress the change in the resonant frequency and Q value and the increase in inductance can be reliably canceled, it is possible to secure good communication state.

  In each of the above-described embodiments, the case where the tag 2 of the present invention is incorporated into the endoscope has been described. However, the present invention is not limited to the above-described embodiment, and is required to be incorporated inside, and The present invention can be similarly applied to any device having a metal material therein.

1 is a diagram illustrating a general configuration of an RFID system. It is a figure which shows the structural example of the endoscope incorporating the RFID tag which concerns on 1st Example of this invention. It is a figure which shows the structure for every component of the RFID tag which concerns on 1st Example of this invention. It is a figure which shows the structure of the state which assembled the component of the RFID tag which concerns on 1st Example of this invention. It is a figure which shows the variation of the RFID tag which concerns on 1st Example of this invention. It is a figure which shows the variation of the RFID tag which concerns on 1st Example of this invention. It is a figure which shows correlation with the width of the notch part of the magnetic sheet in the RFID tag which concerns on 1st Example of this invention, and the resonance frequency. It is a figure which shows the structure of the state which assembled the component of the RFID tag which concerns on the 2nd Example of this invention. It is a figure which shows the structure of the state which assembled the component of the RFID tag which concerns on the 2nd Example of this invention. It is a figure which shows the correlation of the spacer thickness and resonance frequency in the RFID tag which concerns on the 2nd Example of this invention. It is a figure which shows the correlation of the resonant frequency and communication distance in a RFID system.

Explanation of symbols

1 RFID system 2 Tag 2a Substrate 2b Magnetic sheet 2c Notch 2d Spacer 3 Resonant circuit 3a Antenna pattern 4 IC
DESCRIPTION OF SYMBOLS 5 Reader / writer 5a Reader / writer antenna 5b Communication circuit part 5c Arithmetic processing part 6 Endoscope 7 Insertion part 7a Self-tube 7b Tip structure part 8 Operation part 8a Case 8b Operation mechanism part 9 Guide light cable 10 Connector part 11a Container 11b Lid 12 Resin

Claims (5)

An RFID tag used in an RFID system that performs non-contact data communication,
A substantially disk-shaped substrate having at least a loop-shaped antenna, and a disk having a diameter substantially equal to that of the substrate, wherein a region surrounded by an arc and a straight line connecting two points on the circumference is cut out provided with a sheet, the,
The components of the RFID tag are stored in a coin-shaped container, and the components are fixed inside the container with a resin,
An opening is provided in the approximate center of the substrate,
In the opening, RFID tag and the magnetic sheet adjacent to the substrate and the substrate is characterized Rukoto is fixed by the resin. An RFID tag used in an RFID system that performs non-contact data communication,
A substantially disk-shaped substrate having at least a loop-shaped antenna, and a disk having a diameter substantially equal to that of the substrate, wherein a region surrounded by an arc and a straight line connecting two points on the circumference is cut out a sheet, a disk-shaped spacers having substantially the same diameter as the substrate, but Ri Na are laminated in this order,
The components of the RFID tag are stored in a coin-shaped container, and the components are fixed inside the container with a resin,
An opening is provided in the approximate center of the substrate,
In the opening, RFID tag and the magnetic sheet adjacent to the substrate and the substrate is characterized Rukoto is fixed by the resin. An RFID tag used in an RFID system that performs non-contact data communication,
A substantially disk-shaped substrate having at least a loop-shaped antenna, a disk-shaped spacer having a diameter substantially equal to the substrate, and a disk-shaped having a diameter substantially equal to the substrate, the two points on the circumference being a magnetic sheet formed by cutting a region surrounded by an arc and a straight line connecting, but Ri Na are laminated in this order,
The components of the RFID tag are stored in a coin-shaped container, and the components are fixed inside the container with a resin,
An opening is provided in the approximate center of the substrate,
In the opening, RFID tag and the spacer adjacent to the substrate and the substrate is characterized Rukoto is fixed by the resin. The position of the notch of the magnetic sheet is set so that the variation in the inductance of the antenna due to the metal material inside the device incorporating the RFID tag and the variation in the inductance of the antenna due to the magnetic sheet are offset. The RFID tag according to any one of claims 1 to 3, wherein: The RFID tag according to claim 4, wherein the device is an endoscope .

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