Patent Description:
Tobacco products (for example, cigarettes and cigars) burn tobacco during use to produce tobacco smoke. Attempts are made to replace these products that burn tobacco by manufacturing products that release compounds without burning.

An example of such a product is a heating device that releases a compound by heating rather than burning a material. For example, the material may be tobacco or other non-tobacco products, where the non-tobacco products may or may not contain nicotine. As another example, the prior art proposes a heating device of electromagnetic induction heating type, where the structure of the device may refer to <FIG>. When a tobacco product <NUM> is received in the heating device, a susceptor <NUM> is penetrated by an alternating magnetic field generated by an induction coil <NUM> to implement induction heating, thereby heating the tobacco product <NUM>. In order to facilitate real-time monitoring of a heating temperature for the tobacco product <NUM> during the heating process, the heating device uses a temperature sensor <NUM> that is closely attached to the susceptor <NUM> to sense a real-time operating temperature of the susceptor <NUM>, and adjusts a parameter of the alternating magnetic field generated by the induction coil <NUM> according to a sensed result of the temperature sensor <NUM> to make the susceptor <NUM> be within an appropriate heating temperature range.

In the above implementation of the temperature detection of the temperature sensor <NUM>, on one hand, since the temperature sensor <NUM> is usually made of a thermistor metal material, which generates heat under an alternating magnetic field; and on the other hand, the temperature sensor <NUM> and the susceptor <NUM> made of a metal material each generate an induced current, which affects a sensing signal outputted by the temperature sensor <NUM> and affects an accuracy of the sensing signal. <CIT> discloses an aerosol generation apparatus, for heating a smokable material to generate an aerosol, comprising a susceptor, wherein the susceptor comprises an avoidance portion and a heating portion sequentially provided along the direction close to the proximal end; and the size of at least a part of the avoidance portion along the cross-sectional direction of the cavity is less than the size of the heating portion along the cross-sectional direction of the cavity, such that a certain gap is kept between the avoidance portion and the smokable material when the susceptor is inserted into the smokable material. <CIT> discloses a cartridge for use in an electrically heated aerosol-generating system. <CIT> discloses an electronic device for receiving a consumable comprising an aerosol generating substrate.

In order to resolve the problem of accuracy of temperature monitoring of an aerosol generation device in the prior art, this invention provides an aerosol generation device, a susceptor, and a manufacturing method.

An aerosol generation device provided in this invention is configured to heat an inhalable material to generate an aerosol, and the device includes:.

According to present invention, the susceptor is formed into a sheet shape extending in an axial direction of the cavity, and includes a first sheet-like body and a second sheet-like body opposite to each other in a thickness direction, where
the first sheet-like body is connected to the second sheet-like body.

Further, the first sheet-like body includes: a first part extending straight in the axial direction of the cavity, and a second part formed by at least a part of the first part protruding outward in the thickness direction; and
the accommodation cavity is formed between the second part of the first sheet-like body and the second sheet-like body.

Further, the first sheet-like body further includes a third part formed by the first part extending outward in a width direction, to support or hold the susceptor by the third part.

Further, the cavity includes an opening end that removably receives the inhalable material; and
a protrusion height of at least a part of the second part relative to the first part gradually decreases in a direction of getting closer to the opening end.

Further, at least a part of a third part of the first sheet-like body protrudes relatively to other parts in the thickness direction.

Further, the second part is formed in a manner that a cross section is substantially a triangle or circular arc.

Further, the second sheet-like body includes: a fourth part extending straight in the axial direction of the cavity, and a fifth part formed by at least a part of the fourth part protruding outward in the thickness direction; and
the fifth part is arranged opposite to the second part, and the accommodation cavity is formed between the fifth part and the second part.

Further, the temperature sensor further includes a conductive connection portion at least partially penetrating from inside of the accommodation cavity to outside of the susceptor, so that a temperature sensed by the temperature sensor is capable of being received through the conductive connection portion during use.

Further, the second part of the first sheet-like body is formed by punching a flat sheet-like metal or metal plate material.

Further, the cavity includes an opening end that removably receives the inhalable material; and
at least a part of the accommodation cavity is formed into a tapered region with a gradually decreasing cross-sectional area as getting closer to the opening end; and the temperature sensor is accommodated or encapsulated in the tapered region.

Further, the susceptor is formed into a sheet shape extending in the axial direction of the cavity, and includes a first surface and a second surface facing away from each other in a thickness direction, and the first surface and the second surface are flat surfaces, where
the accommodation cavity is located between the first surface and the second surface.

According to present invention, the susceptor includes a first sheet-like part and a second sheet-like part opposite to each other in the thickness direction, and the accommodation cavity is formed by defining between the first sheet-like part and the second sheet-like part.

Further, the first sheet-like part and the second sheet-like part are formed by folding a sheet-like body around an axis.

Further, the first sheet-like part and the second sheet-like part are symmetrical with respect to the axis.

Further, the sheet-like body is prepared by chemical etching.

Further, the sheet-like body includes a dent arranged along the axis.

Further, the first sheet-like part forms the first surface along an outer surface in the thickness direction, and the second sheet-like part forms the second surface along an outer surface in the thickness direction; and
the accommodation cavity is formed between an inner surface of the first sheet-like part in the thickness direction and an inner surface of the second sheet-like part in the thickness direction.

Further, the accommodation cavity includes a first groove extending along the inner surface of the first sheet-like part in the thickness direction;
and/or, the accommodation cavity includes a second groove extending along the inner surface of the second sheet-like part in the thickness direction.

Further, the first sheet-like part and/or the second sheet-like part further includes a base part extending outward in a width direction, so as to support or hold the susceptor by the base part.

Further, the temperature sensor includes a first couple wire and a second couple wire made of different materials.

This invention further provides a susceptor for an aerosol generation device, the susceptor being configured to be penetrated by a changing magnetic field to generate heat to heat an inhalable material, where the susceptor is formed into a sheet shape, the susceptor includes an accommodation cavity extending in a length direction, and the accommodation cavity is configured to accommodate or encapsulate a temperature sensor configured to sense a temperature of the susceptor.

Further, the susceptor includes a first surface and a second surface facing away from each other in a thickness direction, and the first surface and the second surface are flat surfaces, where the accommodation cavity is located between the first surface and the second surface.

According to present invention, the susceptor includes a first sheet-like body and a second sheet-like body opposite to each other in the thickness direction; and the first sheet-like body is connected to the second sheet-like body to form the accommodation cavity.

This invention further provides a manufacturing method for a susceptor for an aerosol generation device, where the susceptor is configured to be penetrated by a changing magnetic field to generate heat to heat an inhalable material, and the method includes the following steps:
providing a first sheet-like body and a second sheet-like body opposite to each other in a thickness direction, and forming an accommodation cavity extending in a length direction between the first sheet-like body and the second sheet-like body; and accommodating or encapsulating, inside the accommodation cavity, a temperature sensor configured to sense a temperature of the susceptor.

According to the above aerosol generation device, susceptor, and manufacturing method in this invention, by encapsulating or accommodating the temperature sensor inside the susceptor, on one hand, an impact of a magnetic field on a sensing portion can be substantially isolated; and on the other hand, the susceptor and the temperature sensor can be integrated to improve stability of installation and accuracy of temperature measurement. Moreover, it is convenient for overall replacement and installation.

One or more embodiments are exemplarily described with reference to the corresponding figures in the accompanying drawings, and the descriptions are not to be construed as limiting the embodiments. Components in the accompanying drawings that have same reference numerals are represented as similar components, and unless otherwise particularly stated, the figures in the accompanying drawings are not drawn to scale.

For ease of understanding of this invention, this invention is described below in more detail with reference to accompanying drawings and specific implementations.

An aerosol generation device provided in this embodiment of this invention has a structure shown in <FIG>, and includes:.

According to settings of a product in use, the inductance coil L may include a cylindrical inductor coil wound into a spiral shape as shown in <FIG>. The cylindrical inductance coil L wound into a spiral shape may have a radius r ranging from about <NUM> to about <NUM>, and in particular, the radius r may be about <NUM>. A length of the cylindrical inductance coil L wound into a spiral shape may range from about <NUM> to about <NUM>, and a number of turns of the inductance coil L may range from about <NUM> to <NUM>. Correspondingly, an inner volume may range from about <NUM><NUM> to about <NUM><NUM>.

In a more preferred implementation, a frequency of the alternating current supplied to the inductance coil L by the circuit <NUM> ranges from <NUM> to <NUM>. More specifically, the frequency may range from about <NUM> to <NUM>.

In a preferred embodiment, a direct current voltage provided by the battery cell <NUM> ranges from about <NUM> V to about <NUM> V, and an amperage of the direct current by which the battery cell <NUM> can provide ranges from about <NUM> A to about <NUM> A.

In the preferred embodiment, the susceptor <NUM> in <FIG> is manufactured by a metal or alloy material with appropriate magnetic permeability, so that induction heating corresponding to a magnetic field can be formed during use, thereby heating the received inhalable material A to generate an aerosol for inhalation. These susceptors <NUM> may be made of grade <NUM> stainless steel (SS420) and alloy materials including iron and nickel (such as J85/J66 Permalloy).

In an embodiment shown in <FIG>, the aerosol generation device further includes a tubular holder <NUM> for arranging the inductance coil L and installing the susceptor <NUM>. Materials of the tubular holder <NUM> may include a high temperature resistant non-metal material such as PEEK or ceramic. In an implementation, the inductance coil L is arranged on an outer wall of the tubular holder <NUM> in a spiral winding manner, and at least a part of the tubular holder <NUM> is hollow to form the cavity configured to receive the inhalable material A.

Further, referring to <FIG> and <FIG>, a sheet-like construction of the susceptor <NUM> has a first end <NUM> and a second end <NUM>. The first end <NUM> is opposite to an opening the cavity configured to receive the inhalable material A. The first end <NUM>, as a free end, is formed into a tip shape to facilitate insertion into the inhalable material A received in the cavity through an opening end, and the second end <NUM>, as an end portion for installation and connection, is configured to provide support through the tubular holder <NUM> to enable the susceptor <NUM> to be stably held, installed, and fixed in the device.

In a more preferred implementation, a construction of the susceptor <NUM> is formed by a first sheet-like body <NUM> and a second sheet-like body <NUM> opposite to each other in a thickness direction together. Specifically,
the first sheet-like body <NUM> includes a flat first part <NUM>, a second part <NUM> formed by the first part <NUM> protruding outward in the thickness direction, and a third part <NUM> formed by at least a part of the first part <NUM> close to the second end <NUM> extending in a width direction.

The shape corresponding to the second sheet-like body <NUM> is similar to that of the first sheet-like body <NUM>, likewise including a flat fourth part <NUM>, a fifth part <NUM> formed by the fourth part <NUM> protruding outward in the thickness direction, and a sixth part <NUM> formed by at least a part of the fourth part <NUM> close to the second end <NUM> extending in the width direction.

After the first sheet-like body <NUM> is combined with the second sheet-like body <NUM>, an accommodation cavity <NUM> configured to accommodate and encapsulate a temperature sensor <NUM> is formed between them. Specifically, the accommodation cavity <NUM> is formed by a first sunken structure <NUM> formed by the second part <NUM> of the first sheet-like body <NUM> and a second sunken structure <NUM> formed by the fifth part <NUM> of the second sheet-like body <NUM> together.

During assembly, a sensing part <NUM> of the temperature sensor <NUM> is accommodated and encapsulated inside the accommodation cavity <NUM> and may be encapsulated and fixed through gluing or the like. In addition, an electrical connection part <NUM> of the temperature sensor <NUM> passes through the second end <NUM> from the inside of the accommodation cavity <NUM> to the outside of the susceptor <NUM> in a form of being designed into an elongated pin, thereby facilitating the connection to the circuit <NUM>, and then the circuit <NUM> may receive a sensing signal of the sensing part <NUM> through the electrical connection part <NUM>. During use, the temperature sensor <NUM> is encapsulated inside the accommodation cavity <NUM> that is substantially shielded by a magnetic field, and the sensing part <NUM> closely abuts against the first sheet-like body <NUM> and/or the second sheet-like body <NUM>, so as to stably or accurately detect the temperature of the susceptor <NUM> and avoid interference of the magnetic field.

In an optional implementation, the temperature sensor <NUM> may be a thermistor type temperature sensor, such as PT1000, that calculates a temperature by monitoring changes in a resistor, or may be a thermocouple type temperature sensor that calculates a temperature by calculating thermoelectromotive force of two ends.

Based on an intention of mass production and manufacturing of the susceptor <NUM>, furthermore, in a preferred implementation, the second part <NUM> of the first sheet-like body <NUM> and/or the fifth part <NUM> of the second sheet-like body <NUM> is formed or prepared by stamping the above flat sheet-like susceptive material such as a metal plate member. In addition, in a stable engagement, the first sheet-like body <NUM> and the second sheet-like body <NUM> may be fixed as a whole by welding such as laser welding.

In a preferred implementation shown in <FIG> and <FIG>, the accommodation cavity <NUM> extends in an axial direction of the susceptor <NUM>. In the implementation, a cross section of the accommodation cavity <NUM> may substantially be rhombic, circular, rectangular, or in other shapes.

According to <FIG>, the second part <NUM> has a tapered portion <NUM> with a gradually decreasing cross-sectional area as getting closer to the first end <NUM> of the susceptor <NUM>, for example, the tapered portion <NUM> has a cone shape, triangular cone shape, or the like. And, the second part <NUM> is configured to reduce resistance during being inserted into the inhalable material A.

In a more preferred implementation, the tapered portion <NUM> of the second part <NUM>, or the combination with the corresponding fifth part <NUM> with a similar configuration may cause a formed front end part of the accommodation cavity <NUM> close to the first end <NUM> to be a tapered shape. In the installation, the sensing part <NUM> of the temperature sensor <NUM> abuts against the tapered front end part of the accommodation cavity <NUM>, so as to facilitate fastening and installation.

According to the preferred implementation shown in the figures, the thickness-direction size of a part in the susceptor <NUM> forming the accommodation cavity <NUM> and composed of the second part <NUM> and the fifth part <NUM> is greater than other parts in the susceptor <NUM>. In addition, a thickness size of the accommodation cavity <NUM> formed by the second part <NUM> and the fifth part <NUM> gradually increases inward in the width direction, so that an outer surface of the susceptor <NUM> formed by the second part <NUM> and the fifth part <NUM> changes gradually. On one hand, a contact area with the inhalable material A is increased to improve efficiency of heat transfer; and on the other hand, the resistance of inserting the susceptor <NUM> into the inhalable material A may be reduced.

In another optional implementation shown in <FIG>, a second sheet-like body 320a/320b of the susceptor 30a/30b is a flat shape. And, only a second part 312a/312b formed by stamping or the like on the first sheet-like body 310a/310b and protruding outward in the thickness direction exists, and an accommodation cavity 330a/330b for accommodating or encapsulating the temperature sensor is formed between the second part 312a/312b and second sheet-like body 320a/320b.

Certainly, according to the implementation shown in <FIG>, a shape of a cross section of the second part 312a/312b may substantially be a triangle or circular arc shape with a thickness size gradually increasing inward in the width direction. In addition, it may be seen from <FIG> that, a protrusion size of the second part 312a/312b in the thickness direction is greater than the thickness size of the first part 311a/311b.

In another variation implementation shown in <FIG>, a thickness of a third part 313c of a first sheet-like body 310c of a susceptor 30c along the susceptor 30c has a greater size than a first part 311c and a second part 312c, so that the third part 313c protrudes relative to other parts on the thickness direction, so as to facilitate installation and holding inside the device.

This invention further proposes a method for manufacturing the susceptor in Embodiment <NUM>. Referring to <FIG>, method steps including the following steps:.

This invention further provides an aerosol generation device. Unlike the aerosol generation device provided in Embodiment <NUM>, referring to <FIG>, in order to facilitate support and fixation for a second end <NUM>, at least a part of a susceptor <NUM> close to the second end <NUM> has a base part <NUM> with an enlarged size. For example, the base part <NUM> is enlarged in a width direction.

Further, referring to <FIG>, an accommodating space or a holding space is provided inside the susceptor <NUM>, and is configured to accommodate, encapsulate, or hold a temperature sensor <NUM> extending in a length direction. The temperature sensor <NUM> is configured to sense a temperature of the susceptor <NUM> during operation. In a preferred implementation shown in <FIG>, at least a part of the temperature sensor <NUM> extends from the second end <NUM>, so as to facilitate connection to a circuit <NUM>. A part of the temperature sensor <NUM> extending or exposed outside the susceptor <NUM> is in a form of an elongated pin.

In an optional implementation, the temperature sensor <NUM> may be a thermistor type temperature sensor, such as PT1000, that calculates a temperature by monitoring changes in a resistor or a thermocouple type temperature sensor that calculates a temperature by calculating thermoelectromotive force of two ends.

Specifically, in a preferred implementation shown in <FIG>, the sheet-like susceptor <NUM> is formed by stacking a first sheet-like part <NUM> and a second sheet-like part <NUM> in the thickness direction.

In the implementation shown in <FIG>, an outer surface of the sheet-like susceptor <NUM> is flat.

This invention further proposes a method suitable for mass manufacturing of the above susceptor <NUM>, the method specifically including the following steps:
S10: Acquire a sheet-like sensing substrate <NUM> for manufacturing a susceptor 30a, and process the sheet-like sensing substrate <NUM> to form several susceptor precursors 30a, as shown in <FIG>.

In the implementation, the material of the sheet-like sensing substrate <NUM> is the above-described metal material having susceptibility, such as a <NUM> thick NiFe alloy soft magnetic board. A manner of processing to form the susceptor precursor 30a may include a manner of chemical etching, and the susceptor precursor 30a is formed after the superfluous part is etched and removed.

Certainly, in the preferred implementation shown in <FIG>, based on convenience of batch manufacturing, the several susceptor precursors 30a obtained by processing are arranged in a matrix.

A specific structure of the susceptor precursor 30a further refers to <FIG>, including a first sheet-like part <NUM> and a second sheet-like part <NUM> on the same plane. The first sheet-like part <NUM> and the second sheet-like part <NUM> are connected rather than separated. In addition, the first sheet-like part <NUM> and the second sheet-like part <NUM> are symmetrical, and specifically, are bilaterally symmetrical along a central axis L in <FIG>.

Further, a first accommodation groove <NUM> for accommodating and holding the temperature sensor <NUM> is arranged on the first sheet-like part <NUM>, or a second accommodation groove <NUM> for accommodating and holding the temperature sensor <NUM> may be further arranged on the second sheet-like part <NUM>.

S20: As shown in <FIG>, the temperature sensor <NUM> is placed into the first accommodation groove <NUM> of the first sheet-like part <NUM>, the second sheet-like part <NUM> is turned over or folded towards the first sheet-like part <NUM> along a direction of an arrow R around the central axis L, the temperature sensor <NUM> is clamped or fixed between the first sheet-like part <NUM> and the second sheet-like part <NUM> after the second sheet-like part <NUM> is turned over, and then the first sheet-like part <NUM> is combined stably with the second sheet-like part <NUM> through laser welding or the like. In this way, the susceptor <NUM> shown in <FIG> is obtained.

In a preferred implementation shown in <FIG>, for ease of turning over the second sheet-like part <NUM> towards the first sheet-like part <NUM>, several dents or grooves <NUM> arranged around the central axis L are arranged on the susceptor precursor 30a. The susceptor precursor 30a with the dents or grooves <NUM> is conducive to the operation process of turning over or folding.

<FIG> is a schematic structural diagram of a susceptor precursor 30b according to another variation implementation. The susceptor precursor 30b includes a first sheet-like part 31b and a second sheet-like part 32b opposite to each other in a length direction. In addition, the susceptor precursor 30b further includes a dent 35b located between the first sheet-like part 31b and the second sheet-like part 32b in the length direction, where the dent 35b extends in the width direction. During manufacturing, the susceptor is obtained by turning over or folding the first sheet-like part 31b towards the second sheet-like part 32b with the dent 35b as an axis. Certainly, a first accommodation groove 311b accommodating the temperature sensor <NUM> is further arranged on the first sheet-like part 31b; and/or, a second accommodation groove 321b is further arranged on the second sheet-like part 32b.

Alternatively, in a variation implementation shown in <FIG>, a first sheet-like part 31c and a second sheet-like part 32c of a susceptor precursor 30c is obtained by fixing after turning over with a dashed line m as an axis.

In the above optional implementations, the susceptor <NUM> is about <NUM> in length, <NUM> in width, and about <NUM> in width. Correspondingly, an extending length of the first accommodation groove <NUM>/311b/311c and/or the second accommodation groove <NUM>/<NUM> b/321c extending from the second end <NUM> to the first end <NUM> is about one-half to two-thirds of a length of the susceptor <NUM>. A region of this length is a region where heat is most concentrated in the susceptor <NUM> during operation. When a front end of the temperature sensor <NUM> abuts against this region, the temperature of the susceptor <NUM> can be obtained more accurately.

In another optional implementation, the first accommodation groove <NUM>/311b/311c and/or the second accommodation groove <NUM>/321b/321c is about <NUM> in depth.

This invention further proposes a method for manufacturing the susceptor in Embodiment <NUM>, the method including the following steps:
S100: Acquire a sheet-like substrate 100a made of a susceptive material, and cover an etching mask 200a on a surface of the sheet-like substrate <NUM>, as shown in <FIG>.

Generally, a feeding material of the sheet-like substrate 100a is a coil, and a board cut into the above size from the coil has a certain bending degree. It is necessary to shape the coil by an appropriate pressure (usually less than <NUM> MPa) before use, so that a curved metal coil is subjected to a certain plastic deformation, and is shaped into a flat sheet-like substrate 100a from a curved metal coil.

According to <FIG>, a light-painted film is used as the etching mask 200a in photochemical etching generally. In addition, the etching mask 200a includes a pattern 210a having the same shape with the susceptor, and a non-pattern blank region 220a.

S200: Etch the sheet-like substrate 100a covered with the etching mask 200a. An acid etching liquid, for example, an etching liquid including hydrofluoric acid, is generally used to etch.

During etching, a part of the sheet-like substrate 100a covered with the pattern 210a is not corroded, while a part corresponding to the blank region 220a is corroded and removed. After the etching is completed, several susceptors identical to the pattern 210a are formed on the sheet-like substrate 100a; and the susceptors may be lightly broken off manually to be detached, thereby obtaining a large number of manufactured susceptors.

Usually, when a sheet-like substrate 100a with a length and width dimension of <NUM> × <NUM> is used as the material for preparation, one sheet-like substrate 100a may be etched to obtain <NUM> to <NUM> susceptors simultaneously.

Compared with machining, stamping, or laser cutting, in a case of manufacturing the susceptor by etching, the etching processing does not generate processing stress on one hand, and does not cause a crystalline phase structure of the internal substrate to change on the other hand, so that the manufactured susceptor can maintain magnetic properties comparable to those of soft magnetic materials, thereby having high heating efficiency in use.

For the susceptor obtained by etching processing, an edge of the obtained susceptor has smooth rounded comers, and a smooth surface of the edge has low surface free energy, which is conducive to reducing adhesion of slag or condensate of an aerosol generation product, while the aesthetic of a surface is maintained.

In another preferred implementation of this invention, the etching process in the above step is performed by conventional photochemical wet etching. Detailed steps include:.

This invention further proposes a susceptor 30d manufactured by the manufacturing method in Embodiment <NUM>. As shown in <FIG>, the susceptor 30d is provided with a notch 36d. Subsequently, a first couple wire and a second couple wire made of different materials are welded onto an inner wall of the notch 36d by laser welding, thereby forming a thermocouple 34d configured to sense a temperature of the susceptor 30d.

In an optional implementation, a nickel chromium alloy wire is used as the first couple wire of the thermocouple 34d as a positive electrode, and a K-type thermocouple made of a nickel silicon alloy wire is used as the second couple wire as a negative electrode.

In the embodiments of this invention, by encapsulating or accommodating the temperature sensor inside the susceptor, on one hand, an impact of a magnetic field on a sensing portion can be substantially isolated; and on the other hand, the susceptor and the temperature sensor can be integrated to improve stability of installation and accuracy of temperature measurement. Moreover, it is convenient for overall replacement and installation.

Claim 1:
An aerosol generation device, configured to heat an inhalable material to generate an aerosol, the device comprising:
a cavity, configured to receive the inhalable material;
a magnetic field generator, configured to generate a changing magnetic field;
a susceptor (<NUM>), configured to be penetrated by the changing magnetic field to generate heat to heat the inhalable material received in the cavity, wherein an accommodation cavity (<NUM>, 330a, 330b) extending in a length direction is arranged in the susceptor (<NUM>); and
a temperature sensor (<NUM>), configured to sense a temperature of the susceptor (<NUM>) and accommodated or encapsulated inside the accommodation cavity (<NUM>, 330a, 330b),
wherein the susceptor is (<NUM>) formed into a sheet shape extending in an axial direction of the cavity, and comprises a first sheet-like body (<NUM>) and a second sheet-like body (<NUM>) opposite to each other in a thickness direction, wherein
the first sheet-like body (<NUM>) is connected to the second sheet-like body (<NUM>).