WO2024070528A1 - 配線基板、電子装置、及び電子モジュール - Google Patents
配線基板、電子装置、及び電子モジュール Download PDFInfo
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- WO2024070528A1 WO2024070528A1 PCT/JP2023/032356 JP2023032356W WO2024070528A1 WO 2024070528 A1 WO2024070528 A1 WO 2024070528A1 JP 2023032356 W JP2023032356 W JP 2023032356W WO 2024070528 A1 WO2024070528 A1 WO 2024070528A1
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- external electrode
- electrode
- wiring board
- wiring
- connection electrode
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/02—Details
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- H10W70/60—
Definitions
- This disclosure relates to a wiring board for mounting electronic components, an electronic device, and an electronic module.
- Patent Document 1 discloses a wiring board that includes an external electrode located on a first surface of a rectangular insulating substrate, and a connection electrode located on a second surface of the insulating substrate, on which an electronic component that is rectangular in plan view is mounted.
- connection electrodes include first and second connection electrodes located along one side of the electronic component.
- the external electrodes include first to fourth external electrodes located at the four corners of the insulating substrate. Inside the insulating substrate, there are located diagonal wiring that electrically connects the second and fourth external electrodes located on the diagonal line of the first surface in a plan view and includes a portion that is inclined with respect to the second surface, and embedded wiring that extends from the second connection electrode that corresponds to the second external electrode in a plan view toward the third external electrode.
- a wiring board comprises an insulating substrate having a rectangular shape in plan view, the insulating substrate having a first surface, a second surface opposite the first surface, and a recess opening into the second surface, an external electrode located on the first surface, and a connection electrode located on a bottom surface of the recess, the external electrodes including a first external electrode and a third external electrode located at opposing corners along a first diagonal of the first surface and electrically connected to the connection electrode, and a second external electrode and a fourth external electrode located at opposing corners along a second diagonal of the first surface, the second external electrode and the fourth external electrode being located inside the insulating substrate and inclined with respect to the first surface.
- the device is connected by a connection wiring including a portion that overlaps the first external electrode in a planar perspective, and further includes a first through conductor that overlaps at least a portion of the first external electrode in a planar perspective and extends from the first surface to the bottom surface, and a second through conductor that overlaps at least a portion of the third external electrode in a planar perspective and extends from the first surface to the bottom surface, and the connection electrodes include a first connection electrode that is connected to the first external electrode via the first through conductor and a second connection electrode that is connected to the third external electrode via the second through conductor, and the first connection electrode and the second connection electrode are located along the first diagonal line in a planar perspective.
- An electronic device includes a wiring board according to one aspect of the present disclosure and an electronic component connected to the wiring board.
- An electronic module according to one embodiment of the present disclosure includes an electronic device according to one embodiment of the present disclosure and a module substrate connected to the electronic device.
- FIG. 1 is an overall perspective view of an electronic device according to a first embodiment with a lid removed;
- FIG. 2 is a perspective view of a wiring board of the electronic device as viewed from the bottom side.
- FIG. 2 is a plan view of a wiring board provided in the electronic device. 2 is a perspective view of the configuration of the lower surface of the wiring board as viewed from above.
- FIG. 2 is a perspective view showing the upper and lower surfaces of the wiring board superimposed on each other;
- FIG. 6 is a cross-sectional view of the wiring board shown in FIG. 3 taken along line VI-VI.
- 7 is a cross-sectional view of the wiring board shown in FIG. 3 and FIG. 4 taken along line VII-VII. 8 is a cross-sectional view of the wiring board shown in FIG.
- FIG. 13 is a perspective view showing the configuration of the upper surface and the configuration of the lower surface of a wiring board according to a sixth embodiment superimposed on each other.
- FIG. FIG. 13 is a plan view of a wiring board according to a seventh embodiment.
- FIG. 13 is a plan view of a modified example of the wiring board.
- FIG. 13 is a plan view of another modified example of the wiring board.
- FIG. 13 is a plan view of still another modified example of the wiring board.
- a wiring board having a configuration that can ensure insulation between internal wirings even when the height is further reduced is desired. According to one aspect of the present disclosure, even when the height is further reduced, insulation between internal wirings can be ensured.
- top and bottom in the following description is for convenience and does not limit the top and bottom when the wiring board and electronic device are actually used.
- the surface of insulating substrate 110 or wiring substrate 100 on which electronic component 150 is mounted is defined as the top surface.
- the positive direction of the Z axis is the upward direction.
- the X axis is the long axis direction of insulating substrate 110 or wiring substrate 100
- the Y axis is an axis that perpendicularly intersects with the X axis and the Z axis.
- FIG. 1 is an overall perspective view of the electronic device 10 of this embodiment with the lid 120 removed.
- FIG. 1 is a view of the top surface to which the lid 120 is joined.
- FIG. 2 is a perspective view of the wiring board 100 of the electronic device 10 from the bottom surface opposite to the side to which the lid 120 is joined.
- the electronic device 10 includes a wiring board 100, electronic components 150, and a cover 120.
- the wiring board 100 includes an insulating substrate 110, electrodes (connection electrodes 113 and external electrodes 114), wiring, and the like.
- the insulating substrate 110 has a first surface S1 located on the side opposite to the side to which the lid 120 is joined, a second surface S2 located on the side opposite to the first surface S1, and a recess 111 which is a concave area opening into the second surface S2.
- the insulating substrate 110 has a flat base 110b and a frame 110a located on the upper surface of the base 110b.
- the electronic component 150 is located inside the recess 111.
- the frame 110a defines the open surface of the recess 111, the bottom surface 7 (the surface on which the electronic component 150 is placed) opposite the open surface, and the side surfaces of the recess 111.
- the side surfaces of the recess 111 are each parallel to the z direction.
- parallel is intended to mean that they do not intersect with a reference surface or reference line at a visually noticeable level, and does not require strict parallelism.
- a frame-shaped metallized layer 112 is located on the upper surface of the frame 110a, i.e., the joint surface between the frame 110a and the lid 120.
- the frame-shaped metallized layer 112 is joined to the lid 120 using a sealing material such as a gold-tin alloy (AuSn) or silver solder.
- AuSn gold-tin alloy
- the size of the wiring board 100 here is about 0.8 to 10.0 mm on a side in the xy plane, and about 0.1 to 2.0 mm thick in the z direction.
- the wiring board 100 according to this embodiment is particularly useful when the thickness of the wiring board 100 is 0.2 mm or less and the thickness of the base 110b is 0.1 mm or less, making it difficult to ensure insulation.
- a first connection electrode 1131 and a second connection electrode 1132 are located on the bottom surface 7 of the recess 111.
- the first connection electrode 1131 and the second connection electrode 1132 may be collectively referred to as the connection electrode 113.
- the electronic component 150 and the connection electrode 113 are connected via a bonding material 160 as a conductive adhesive.
- the bonding material 160 may be, for example, a resin to which conductive particles such as silver have been added. If the bonding material 160 is a thermosetting material, the bonding material 160 is applied to the connection electrode 113 in advance, and the electronic component 150 is positioned and placed relative to the connection electrode 113 (bonding material 160) and heated, so that the electronic component 150 is connected to the connection electrode 113 via the bonding material 160.
- the connection electrode 113 may have a convex shape relative to the bottom surface 7 of the recess 111. As a result, the electronic component 150 is fixed in the recess 111 at a distance from the bottom surface 7. If the electronic component 150 generates vibrations during operation, the thickness of the connection electrode 113 and the bonding material 160 may be determined so that the electronic component 150 does not come into contact with the bottom surface and the lid body 120 in the recess 111 during vibration.
- connection electrode 113 may be embedded in the bottom surface 7 of the recess 111, with the upper surface of the connection electrode 113 being located on the same plane as the bottom surface 7. This allows the wiring board 100 to be made even lower in height.
- a bonding material is located on the upper surface of the connection electrode 113, and the electronic component 150 is located on this bonding material. This allows the electronic component 150 to be fixed within the recess 111 at a distance from the bottom surface 7.
- a first external electrode 1141, a second external electrode 1142, a third external electrode 1143, and a fourth external electrode 1144 are located at the four corners of the first surface S1 opposite the recess 111 of the base 110b.
- the first external electrode 1141, the second external electrode 1142, the third external electrode 1143, and the fourth external electrode 1144 may be collectively referred to as the external electrodes 114.
- the external electrodes 114 are external electrodes joined to the module substrate 200. Of the external electrodes 114, the first external electrode 1141 and the third external electrode 1143 are electrodes to which a potential corresponding to the voltage supplied to the electronic component 150 is applied, and the second external electrode 1142 and the fourth external electrode 1144 are electrodes that are grounded.
- the electronic device 10 is included in the electronic module 1 together with a module substrate 200 to which external electrodes 114 are joined using solder 210 (see Figures 6 and 7).
- Examples of electronic components 150 include piezoelectric vibration elements and quartz crystal vibrators used in oscillators and vibrators. Furthermore, multiple electronic components 150 may be located within one recess 111 as necessary.
- the insulating substrate 110 is made of a ceramic material, such as an aluminum oxide sintered body, an aluminum nitride sintered body, a mullite sintered body, or a glass-ceramic sintered body.
- the insulating substrate 110 will be described as being an aluminum oxide sintered body (alumina sintered body).
- the frame portion 110a and the base portion 110b of the insulating substrate 110 have an integral structure.
- the lid 120 is made of a conductive metal and is joined to the frame-shaped metallization layer 112 to hermetically seal the recess 111.
- a conductive sealing member such as AuSn or silver solder is used for sealing.
- the lid 120 may be grounded. By grounding the lid 120, the propagation of external noise into the recess 111 can be reduced.
- the lid 120 is connected to the frame-shaped metallization layer 112 via a conductive sealing member. As shown in FIG. 8, the frame-shaped metallization layer 112 is connected to the second external electrode 1142 of the wiring board 100 via the frame wiring 116 and the via conductor 1153. The frame wiring 116 and the via conductor 1153 will be described later. By grounding the second external electrode 1142, the lid 120 is in a grounded state.
- the frame-shaped metallization layer 112 is made of a conductive metal and is printed on the joint surface of the frame portion 110a.
- the frame-shaped metallization layer 112, the exposed surface of the connection electrode 113, and the exposed surface of the external electrode 114 may be covered with a plating layer of nickel and/or gold.
- the exposed surface may be nickel-plated to a thickness of 1 to 20 ⁇ m, and a gold plating layer may be formed on the nickel plating layer to a thickness of 0.1 to 3.0 ⁇ m.
- FIG. 3 is a plan view of the wiring board 100.
- FIG. 4 is a perspective view of the configuration of the first surface S1 of the wiring board 100 seen from the second surface S2 side.
- FIG. 5 is a perspective view of the configuration of the second surface S2 of the wiring board 100 and the configuration of the first surface S1 superimposed on each other.
- FIG. 6 is a cross-sectional view of the wiring board 100 shown in FIG. 3 taken along line VI-VI.
- FIG. 7 is a cross-sectional view of the wiring board 100 shown in FIG. 3 and FIG. 4 taken along line VII-VII.
- FIG. 8 is a cross-sectional view of the wiring board 100 shown in FIG. 4 taken along line VIII-VIII.
- 6 and 7 show the entire electronic module 1 including the electronic component 150 connected to the connection electrode 113, the cover 120 joined to the frame-shaped metallization layer 112, and the module substrate 200 connected to the external electrode 114 via solder 210 (as the electronic module 1, the electronic device 10 is attached to the module substrate 200).
- the first connection electrode 1131 located on the bottom surface 7 of the recess 111 is connected to the first external electrode 1141 directly below by a first penetrating conductor 1151 that vertically penetrates the insulating substrate 110 (base 110b).
- the second connection electrode 1132 is connected to the third external electrode 1143 directly below by a second penetrating conductor 1152 that vertically penetrates the insulating substrate 110 (base 110b).
- a convex floating island portion 2 may be located on the bottom surface of the recess 111.
- the first connection electrode 1131 may be located on the floating island portion 2.
- the floating island portion 2 may be made of the same material as the insulating substrate 110, and may be integral with the insulating substrate 110.
- the thickness (length in the Z direction) of the floating island portion 2 may be adjusted as appropriate depending on the characteristics, shape, etc. of the electronic component 150 to be mounted.
- the frame-shaped metallization layer 112 is connected to the second external electrode 1142 through the frame wiring 116 located inside the frame portion 110a and the base portion 110b and the via conductor 1153.
- the second external electrode 1142 and the fourth external electrode 1144 are located on a diagonal line of the wiring board 100 and are connected to each other by a connection wiring 117 (a wiring provided inside the insulating board 110) located inside the base portion 110b.
- the connection wiring 117 is necessary for electrical continuity when the exposed surfaces of the second external electrode 1142 and the fourth external electrode 1144 are covered with a plating layer.
- the first external electrode 1141 and the third external electrode 1143 which are electrically connected to the electronic component 150, are also located on a diagonal line of the wiring board 100.
- connection electrodes and the ground electrodes By arranging the connection electrodes and the ground electrodes diagonally, the possibility of the module board 200 malfunctioning due to the polarity of the electronic device 10 can be reduced, even if the electronic device 10 is mistakenly mounted on the module board 200 in a position rotated 180 degrees.
- the first connection electrode 1131 is connected to the first external electrode 1141 by the first penetrating conductor 1151.
- FIG. 8 is a cross-sectional view of the wiring board 100 taken along the cross-sectional line VIII-VIII, including the second external electrode 1142, the fourth external electrode 1144, and the connection wiring 117.
- the inner-frame wiring 116 has a first end that contacts the side opposite to the joint surface of the frame-shaped metallization layer 112 with the lid 120, and is covered by the coating layer 110e that faces the recess 111 and is not exposed to the outside.
- the inner-frame wiring 116 contacts the upper end of the via conductor 1153 near the second end opposite to the first end.
- the lower end of the via conductor 1153 contacts the second external electrode 1142.
- the material of the coating layer 110e may be the same as that of the coating layer 110f.
- connection wiring 117 connecting the second external electrode 1142 and the fourth external electrode 1144 has both ends in contact with the second external electrode 1142 and the fourth external electrode 1144, respectively, and electrically connects the second external electrode 1142 and the fourth external electrode 1144.
- the remaining parts of the connection wiring 117 other than both ends are embedded inside the insulating substrate 110 by the above-mentioned coating layer 110f.
- the connection wiring 117 includes a portion whose extension direction (i.e., the direction connecting the second external electrode 1142 and the fourth external electrode 1144) is inclined obliquely with respect to the first surface S1 of the insulating substrate 110. That is, the distance of the connection wiring 117 from the lower surface of the insulating substrate 110 (the thickness of the coating layer 110f) changes along the extension direction of the connection wiring 117. The thickness of the coating layer 110f increases toward the center. As a result, the connection wiring 117 enters the inside of the insulating substrate 110 obliquely from both ends with respect to the lower surface of the insulating substrate 110.
- the inclination angle of the connection wiring 117 with respect to the lower surface of the insulating substrate 110 and the length of the inclined portion may be appropriately determined according to the length of the wiring and/or the positional relationship with other wiring.
- the inclination angle does not need to be constant (i.e., the connection wiring 117 does not need to be linear in cross section), and here, the connection wiring 117 has a curved shape in cross section.
- the wiring board 100 comprises an insulating substrate 110 that is rectangular in plan view and has a first surface S1, a second surface S2 located on the opposite side to the first surface S1, and a recess 111 that opens into the second surface S2.
- the wiring board 100 also comprises an external electrode 114 located on the first surface S1, and a connection electrode 113 located on the bottom surface of the recess 111.
- the external electrode 114 includes a first external electrode 1141 and a third external electrode 1143 that are located at opposing corners along a first diagonal of the first surface S1 and are electrically connected to the connection electrode 113.
- the external electrode 114 also includes a second external electrode 1142 and a fourth external electrode 1144 that are located at opposing corners along a second diagonal of the first surface S1.
- the second external electrode 1142 and the fourth external electrode 1144 are located inside the insulating substrate 110 and are connected by a connection wiring 117 that includes a portion that is inclined with respect to the first surface S1.
- the wiring board 100 further includes a first penetrating conductor 1151 that overlaps at least a portion of the first external electrode 1141 in a planar perspective and extends from the first surface S1 toward the bottom surface 7.
- the wiring board 100 further includes a second penetrating conductor 1152 that overlaps at least a portion of the third external electrode 1143 in a planar perspective and extends from the first surface S1 toward the bottom surface 7.
- connection electrode 113 includes a first connection electrode 1131 connected to the first external electrode 1141 via a first through conductor 1151, and a second connection electrode 1132 connected to the third external electrode 1143 via a second through conductor 1152.
- the first connection electrode 1131 and the second connection electrode 1132 are located along the first diagonal line when viewed from a plan view.
- the first external electrode 1141 and the third external electrode 1143 are located at corners facing each other along the first diagonal of the first surface S1.
- the second external electrode 1142 and the fourth external electrode 1144 are located at corners facing each other along the second diagonal of the first surface S1.
- the second external electrode 1142 and the fourth external electrode 1144 are located inside the insulating substrate 110 and are connected by a connection wiring 117 that includes a portion that is inclined with respect to the first surface S1.
- the first connection electrode 1131 and the second connection electrode 1132 are located at positions along the first diagonal in planar perspective.
- the wiring connecting the first connection electrode 1131 and the first external electrode 1141 and the wiring connecting the second connection electrode 1132 and the third external electrode 1143 do not overlap the connection wiring 117 in planar perspective.
- the wiring board 100 can be made low-profile while ensuring insulation between the wiring for connecting the connection electrode 113 and the external electrode 114 and the ground connection wiring 117.
- first connection electrode 1131 and the second connection electrode 1132 for connecting the electronic component 150 are positioned along a diagonal line, the posture of the electronic component 150 is likely to be stable when the electronic component 150 is mounted.
- the recess 111 has four inner walls 111a, 111b, 111c, and 111d as shown in FIG. 3.
- the first penetrating conductor 1151 may be located inside the first external electrode 1141 and offset from the center of the first connecting electrode 1131 in a direction opposite to the inner wall 111a and/or inner wall 111d that is closer to the first connecting electrode 1131 among the four inner walls in plan view.
- the second penetrating conductor 1152 may be located inside the second external electrode 1143 and offset from the center of the second connecting electrode 1132 in a direction opposite to the inner wall 111b and/or inner wall 111c that is closer to the second connecting electrode 1132 among the four inner walls in plan view.
- first penetrating conductor 1151 is connected to the first connection electrode 1131.
- a portion of the first penetrating conductor 1151 is exposed on the side surface of the floating island portion 2 and the bottom surface 7 of the recess 111.
- the first penetrating conductor 1151 is located away from the sidewall of the recess 111, which is subject to thermal stress when the wiring board 100 is sealed with the lid 120, reducing the possibility of cracks originating from the first penetrating conductor 1151 due to the thermal stress.
- the first connection electrode 1151 may be offset from at least the center of the first connection electrode 1131 in the opposite direction to the inner wall 111a.
- the wiring board 100 is a rectangle that is longer in the X direction than the Y direction in a plan view as shown in FIG. 3, etc., thermal stress increases in the long side direction (X direction). Therefore, offsetting the first connection electrode 1151 from the center of the first connection electrode 1131 along the X direction in the opposite direction to the inner wall 111a is effective in reducing the possibility of the above-mentioned cracks occurring.
- the first through conductor 1151 may be at least partially located outside the first connection electrode 1131 when viewed from a plan view.
- the above configuration can further reduce the possibility of cracks originating from the first through conductor 1151 due to thermal stress when sealing the wiring board 100 with the lid 120.
- a convex floating island portion 2 is located on the bottom surface of the recess 111, and the first connection electrode 1131 may be located on the floating island portion 2.
- the first connection electrode 1131 is located on the convex floating island portion 2 at the bottom surface of the recess 111, so that the shape of the first connection electrode 1131 is easily maintained when forming the recess 111 in the insulating substrate 110.
- through holes are formed in the ceramic green sheet that will become the insulating substrate 110 and a conductor is injected into it to form the first through conductor 1151, the second through conductor 1152, and the via conductor 1153.
- a metallization paste is applied using a mask to the positions of the connection electrodes 113 on the upper surface of the ceramic green sheet, as well as to a suitable position range for forming the in-frame wiring 116.
- a ceramic paste of the same material as the ceramic green sheet is applied using a mask to a suitable position range that covers the portion of the metallization paste that corresponds to the in-frame wiring 116.
- the application of the metallization paste and the application of the ceramic paste are performed, for example, by screen printing.
- metallization paste is applied to each position of the external electrodes 114 on the underside of the ceramic green sheet using a mask.
- the second external electrode 1142 and the fourth external electrode 1144 are connected by metallization paste applied to the position of the connection wiring 117 when viewed from the bottom.
- Ceramic paste is further applied in layers using a mask from the gap portion of the external electrode 114 (including the portion where the metallization paste is applied) to near the inner boundary of the external electrode 114. At this time, the amount of ceramic paste applied may be increased or decreased or may be non-uniform depending on the inclination angle of the connection wiring 117, etc.
- the ceramic green sheet coated with the metallization paste and ceramic paste on both sides is placed on a flat plate and pressed from the top side by a pressing tool having irregularities corresponding to the recess 111, the frame 110a, the floating island 2, and the connection electrode 113.
- the recess 111 is formed, and the metallization paste that becomes the connection electrode 113 is pressed down toward the bottom surface 7 of the recess 111, forming the floating island 2 and the connection electrode 113 located on the bottom surface 7.
- the part of the metallization paste that extends approximately parallel to the bottom surface 7 of the recess 111 of the frame wiring 116 is sandwiched and buried between the coating layer 110e and the ceramic green sheet.
- the upper end of the via conductor 1153 is pressed downward by the metallization paste and ceramic paste that become the frame wiring 116, so that it does not penetrate from the lower surface of the insulating substrate 110 to the bottom surface of the recess 111.
- the ceramic green sheet, metallization paste, and ceramic paste are deformed in the area outside the recess 111 and are filled into the recess of the pressing tool.
- the metallization paste that becomes the frame wiring 116 sandwiched between the coating layer 110e and the ceramic green sheet is embedded in the frame 110a.
- the metallization paste and ceramic paste are formed into a planar shape on the underside of the ceramic green sheet, forming four external electrodes 114.
- the inner ends of the external electrodes 114 are pressed into the interior of the insulating substrate 110 by the ceramic paste.
- the metallization paste connecting the second external electrode 1142 and the fourth external electrode 1144 is pressed into the interior of the insulating substrate 110 by the ceramic paste, forming the connection wiring 117.
- the coating layers 110f and 110e are integrated with the ceramic green sheet.
- the metallization paste sandwiched between them becomes the frame-shaped metallization layer 112
- the inner-frame wiring 116 and the connection wiring 117 that are not exposed except at the bonding surfaces with the connection electrodes 113 and external electrodes 114, and the wiring board 100 is obtained by a firing process. After that, plating processes, firing processes, attachment of electronic components 150, joining of the lid body 120, etc. are performed as necessary.
- the conductive material that will become the first penetrating conductor 1151 will flow toward the wall surface of the recess 111 when the recess 111 is formed.
- the position of the first penetrating conductor 1151 after completion to be away from the side wall of the recess 111, it is possible to reduce the possibility that the conductive material of the first penetrating conductor 1151 will deviate from the range in which it can be connected to the first connection electrode 1131.
- FIG. 9 is a plan view of the wiring board 100A according to the second embodiment.
- FIG. 10 is a cross-sectional view of the wiring board shown in FIG. 9 taken along line X-X.
- the wiring board 100A has a first through conductor 1151A and a second through conductor 1152A.
- a part of the end face of the first penetrating conductor 1151A on the bottom surface 7 side is connected to the first connection electrode 1131, and an insulating coating 3 may be located between the remaining part of the end face of the first penetrating conductor 1151A and the bottom surface 7 of the recess 111.
- the end face (upper end face) of the first penetrating conductor 1151A that overlaps with the first connection electrode 1131 is connected to the lower surface of the first connection electrode 1131.
- the end face (upper end face) of the first penetrating conductor 1151A that does not overlap with the first connection electrode 1131 abuts against the lower surface of the coating 3 located between the end face and the bottom surface 7 of the recess 111.
- a portion of the end face (upper end face) of the second penetrating conductor 1152A on the bottom surface 7 side is connected to the second connection electrode 1132, and an insulating coating portion 3 may be located between the remaining portion of the end face of the second penetrating conductor 1152A and the bottom surface 7 of the recess 111.
- the first and second penetrating conductors 1151A and 1152A are covered by the covering portion 3 and are not exposed on the bottom surface 7 of the recess 111. Therefore, the exposed surfaces of the first and second penetrating conductors 1151A and 1152A at the bottom surface 7 of the recess 111 are not plated. This reduces the possibility that the first and second penetrating conductors 1151A and 1152A will protrude from the bottom surface 7 of the recess 111. As a result, the possibility that the first and second penetrating conductors 1151A and 1152A will come into contact with the electronic component 150 is reduced.
- Fig. 11 is a plan view of a wiring board 100B according to embodiment 3.
- Fig. 12 is a cross-sectional view of the wiring board 100B shown in Fig. 11 taken along line XII-XII.
- the wiring board 100B has a first through conductor 1151B and a second through conductor 1152B.
- the wiring board 100B may include an internal wiring 4 that is connected to the end face of the first through conductor 1151B on the bottom surface 7 side, extends along a plane substantially parallel to the first surface S1, and has the first through conductor 1151B located inside it in a planar perspective.
- the wiring board 100B may also include a covering portion 3 that is located between the internal wiring 4 and the bottom surface 7 of the recess 111 and is adjacent to the first connection electrode 1131 in a planar perspective.
- the internal wiring 4 is a wiring that connects the first through conductor 1151B and the first connection electrode 1131. In a planar perspective, the internal wiring 4 overlaps at least a portion of the first connection electrode 1131. In the example shown in FIG. 11, a portion of the first through conductor 1151B overlaps the first connection electrode 1131 in a planar perspective, but the first through conductor 1151B and the first connection electrode 1131 do not necessarily have to overlap.
- the internal wiring 4 is connected to the end of the first penetrating conductor 1151B, thereby improving the connection reliability between the first connection electrode 1131 and the first penetrating conductor 1151B.
- the first penetrating conductor 1151B is covered by the covering portion 3 and is not exposed at the bottom surface 7 of the recess 111, the exposed surface of the first penetrating conductor 1151B at the bottom surface 7 of the recess 111 is not plated. This reduces the possibility that the first penetrating conductor 1151B will protrude from the bottom surface 7 of the recess 111.
- the wiring board 100B may include an internal wiring 4 that is connected to the end face of the second through conductor 1152B on the bottom surface 7 side, and at least a portion of which extends along a plane approximately parallel to the first surface S1, with the second through conductor 1152B located inside it in a planar perspective.
- the wiring board 100B may also include a covering portion 3 that is located between the internal wiring 4 and the bottom surface 7 of the recess 111 and adjacent to the first connection electrode 1131 in a planar perspective.
- FIG. 13 is a cross-sectional view of a wiring board 100C according to the fourth embodiment.
- the wiring board 100C has a first through conductor 1151C.
- the wiring board 100C may include a first internal wiring 5 that is connected to the end face of the first through conductor 1151C on the bottom surface 7 side of the recess 111, at least a part of which extends along a plane approximately parallel to the first surface S1, and in which the first through conductor 1151C is located in a planar perspective.
- the wiring board 100C may also include a covering portion 3C that is located between the first internal wiring 5 and the bottom surface 7 of the recess 111 and in which the first through conductor 1151C is located in a planar perspective, and a second internal wiring 6 that connects the first internal wiring 5 and the first connection electrode 1131. In the wiring board 100C, at least a part of the covering portion 3C is located below the first connection electrode 1131.
- the first through conductor 1151C is located inside the covering portion 3C.
- the first internal wiring 5 is a wiring that connects the second internal wiring 6 and the first through conductor 1151C.
- the shape of the second internal wiring 6 in a plan view may be substantially the same as that of the first connection electrode 1131.
- the entire end face of the first penetrating conductor 1151C is covered by the covering portion 3C, further reducing the risk of the first penetrating conductor 1151C protruding from the bottom surface 7 of the recess 111.
- FIG. 14 is a perspective view showing the configuration of the upper surface and the configuration of the lower surface of a wiring board 100D according to the fifth embodiment superimposed on each other.
- the wiring board 100D includes a first connection electrode 1131D, a second connection electrode 1132D, a first through conductor 1151D, a second through conductor 1152D, and internal wiring 4D.
- the first connection electrode 1131D and the second connection electrode 1132D may be located at positions that are point-symmetric with respect to the center of the second surface S2.
- the first connection electrode 1131D and the second connection electrode 1132D which are positioned in point symmetry, can be moved according to the shape/size of the electronic component 150, improving the degree of freedom when mounting the electronic component 150 on the wiring board 100D. Since the first connection electrode 1131D and the second connection electrode 1132D are positioned in point symmetry, if the electronic component 150 also has a point symmetric shape, the electronic component 150 can be stably mounted on the first connection electrode 1131D and the second connection electrode 1132D.
- connection wiring 117 may extend linearly from the second external electrode 1142 to the fourth external electrode 1144 in a plan view. This makes the configuration of the connection wiring 117 simple and compact.
- the shape of the first connection electrode 1131D and the shape of the second connection electrode 1132D may be different in a planar view.
- first connection electrode 1131D and the second connection electrode 1132D have the same shape and are located in point-symmetrical positions, it is difficult to determine the directionality of the wiring board 100D. Therefore, the first connection electrode 1131D and the second connection electrode 1132D may be configured to have different shapes in a planar view. This allows either the first connection electrode 1131D or the second connection electrode 1132D to be used as an alignment mark, making it easier to determine the directionality of the wiring board 100D.
- a part of the internal wiring 4D connected to the second connection electrode 1132D may be exposed to the bottom surface 7 of the recess 111, and a part of the internal wiring 4D may be plated in the same manner as the second connection electrode 1132D.
- the internal wiring 4D and the second connection electrode 1132D are connected inside the insulating substrate 110, and may be in contact with each other in a plan view, or may be separated from each other by the presence of a ceramic coating between them.
- the internal wiring 4D connected to the first connection electrode 1131D is not exposed to the bottom surface 7 of the recess 111.
- the internal wiring 4D and the first connection electrode 1131D are connected inside the insulating substrate 110.
- the first connection electrode 1131D, the second connection electrode 1132D, and the exposed internal wiring 4D will not have a rotationally symmetric shape with respect to the center of the second surface S2.
- the first connection electrode 1131D is rotated 180 degrees around the center of the second surface S2 as the axis of rotation, the first connection electrode 1131D does not overlap with the second connection electrode 1132D and the exposed internal wiring 4D.
- the first penetrating conductor 1151D may be located inside the first external electrode 1141 and offset from the center of the first connecting electrode 1131D toward the inner wall of the recess 111 in a planar perspective.
- the second penetrating conductor 1152D may be located inside the third external electrode 1143 and offset from the center of the second connecting electrode 1132D toward the inner wall of the recess 111 in a planar perspective.
- FIG. 15 is a perspective view showing the configurations of the upper and lower surfaces of a wiring board 100E according to the sixth embodiment superimposed on each other.
- the wiring board 100E includes a first connection electrode 1131E, a second connection electrode 1132E, a first through conductor 1151E, a second through conductor 1152E, and internal wiring 4E.
- the first connection electrode 1131E and the second connection electrode 1132E may be located at positions that are point-symmetric with respect to the center of the second surface S2.
- the first connection electrode 1131E may be located at a position that does not overlap the first external electrode 1141 at all in a plan view.
- the first connection electrode 1131E is connected to the first external electrode 1141 via the internal wiring 4E and the first through conductor 1151E that extends from the first surface S1 toward the bottom surface 7.
- the second connection electrode 1132E may be located at a position that does not overlap the third external electrode 1143 at all in a plan view.
- the second connection electrode 1132E is connected to the third external electrode 1143 via the internal wiring 4E and the second through conductor 1152E that extends from the first surface S1 toward the bottom surface 7.
- connection wiring 117E may have a first portion that extends in a direction from the second external electrode 1142 to the third external electrode 1143 in a plan view.
- the connection wiring 117E may have a second portion that extends in a direction from the third external electrode 1143 to the fourth external electrode 1144, and a third portion that extends in a direction from the first external electrode 1141 to the fourth external electrode 1144. In this way, the connection wiring 117E may be configured in a crank shape.
- connection wiring 117E is configured in this manner, even if the first connection electrode 1131E is moved to a position closer to the second external electrode 1142 than the first connection electrode 1131D shown in FIG. 14, and the second connection electrode 1132E is moved to a position closer to the fourth external electrode 1144 than the second connection electrode 1132D shown in FIG. 14, the possibility of a short circuit between the connection wiring 117E and the first connection electrode 1131E and between the connection wiring 117E and the second connection electrode 1132E is reduced, thereby improving the freedom of wiring design for the wiring board 100E.
- connection wiring 117E may have a first portion that extends from the second external electrode 1142 to the fourth external electrode 1144 in a plan view, and that curves and extends away from the first connection electrode 1131E.
- the connection wiring 117E may also have a second portion that curves and extends away from the second connection electrode 1132E. In this way, the connection wiring 117E may be configured in a curved S-shape.
- connection wiring 117E is configured to be bent or curved between the second external electrode 1142 and the fourth external electrode 1144.
- the first connection electrode 1131E is configured to be shifted toward the center from the corner of the bottom surface 7 of the recess 111, or if the first connection electrode 1131E is modified to have a shape that extends toward the center, or if the inner end of the first connection electrode 1131E is positioned closer to the center, the distance between the first connection electrode 1131E and the connection wiring 117E can be made longer than with the straight connection wiring 117. This ensures insulation between the connection wiring 117E and the first connection electrode 1131E.
- FIG. 16 is a plan view of a wiring board 100F according to the seventh embodiment.
- the wiring board 100F further includes a pillow portion 130.
- Two pillow portions 130 are provided, one at each corner of the recess 111 along one of the diagonals of the bottom surface 7 of the recess 111 in a plan view.
- the pillow portion 130 is an insulator that has a rectangular shape in a plan view and is convex with respect to the bottom surface 7 of the recess 111.
- the outer edge of the pillow portion 130 may be adjacent to the frame portion 110a.
- the height of the pillow portion 130 may be approximately the same as the height of the upper surface of the first connection electrode 1131. Alternatively, the height of the pillow portion 130 may be approximately the same as the height of the first connection electrode 1131 plus the thickness of the bonding material 160.
- the pillow portion 130 may be made of an insulating inorganic material.
- the insulating inorganic material includes ceramics such as aluminum oxide sintered body (alumina ceramics), aluminum nitride sintered body, mullite sintered body, or glass ceramic sintered body.
- the pillow portion 130 is located away from the wall surface of the recess 111.
- the pillow portion 130 may be a floating island.
- the floating islands are located at the four corner portions, and the planar shapes of the four floating islands of the wiring board 100F are symmetrical, resulting in excellent flatness.
- the pillow portion 130 allows the piezoelectric vibration element to be mounted horizontally and stably.
- the pillow portion 130 reduces the possibility of the piezoelectric vibration element being damaged when the electronic device 10 is subjected to an impact.
- FIG. 17 is a plan view of a modified example of wiring board 100F.
- the wiring board 100F may include a pillow portion 130A.
- the pillow portion 130A is integrally connected to the frame portion 110a (see FIG. 1) of the insulating board 110, and two pillow portions 130A are provided, one at each corner of the recess 111 along one of the diagonals of the bottom surface 7 of the recess 111.
- the pillow portion 130A is stronger than the pillow portion 130, since it is integrally connected to the frame portion 110a.
- FIG. 18 is a plan view of another modified example of wiring board 100F.
- the wiring board 100F may include a pillow portion 130B.
- the pillow portion 130B is located away from the wall surface of the recess 111.
- the pillow portion 130B may be a floating island.
- Two pillow portions 130B are provided facing each other along the short side of the bottom surface 7 of the recess 111.
- the first and second connection electrodes 1131 and 1132 are located on the pillow portion 130B.
- the upper surfaces of the first and second connection electrodes 1131 and 1132 may be flush with the pillow portion 130B.
- a part of either of the two pillow portions 130B may be the floating island portion 2 (see Figure 6) where the first and second connection electrodes 1131 and 1132 are located, and the remaining part may function as a pillow portion supporting the piezoelectric vibration element.
- the first and second connection electrodes 1131 and 1132 are located in the floating island portion 2, and the pillow portion 130B may be integrated with the floating island and extend in the direction of the short side of the bottom surface 7.
- the pillow portion 130B includes the floating island portion 2 in which the first and second connection electrodes 1131 and 1132 are located, the pillow portion 130B is stronger than the pillow portion 130A.
- FIG. 19 is a plan view of yet another modified example of wiring board 100F.
- the wiring board 100F may include a pillow portion 130C.
- the pillow portion 130C differs from the pillow portion 130B shown in FIG. 18 in that it is integrated with the frame portion 110a.
- Two pillow portions 130C are provided facing each other along the short side of the bottom surface 7 of the recess 111. In this way, the pillow portion 130C is integrated with the frame portion 110a, and therefore has even greater strength than the pillow portion 130B.
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Abstract
Description
以下、本開示の実施の形態を図面に基づいて説明する。さらなる低背化をした場合であっても、内部配線間での絶縁性が確保できる構成を有する配線基板が所望される。そして、本開示の一態様によれば、さらなる低背化をした場合であっても、内部配線間での絶縁性が確保できる。
本開示の他の実施形態について、以下に説明する。説明の便宜上、上記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を繰り返さない。
図11は実施形態3に係る配線基板100Bの平面図である。図12は図11に示される配線基板100BのXII-XII線矢視断面図である。
図13は実施形態4に係る配線基板100Cの断面図である。
図14は実施形態5に係る配線基板100Dの上面の構成と下面の構成とを重ね合わせて見た透視図である。
図15は実施形態6に係る配線基板100Eの上面の構成と下面の構成とを重ね合わせて見た透視図である。
図16は実施形態7に係る配線基板100Fの平面図である。
2 浮島部
3 被覆部
4 内部配線
5 第1内部配線
6 第2内部配線
7 底面
10 電子装置
100 配線基板
110 絶縁基板
111 凹部
113 接続電極
114 外部電極
117 接続配線
130 枕部
150 電子部品
200 モジュール基板
1131 第1接続電極
1132 第2接続電極
1141 第1外部電極
1142 第2外部電極
1143 第3外部電極
1144 第4外部電極
1151 第1貫通導体
1152 第2貫通導体
S1 第1面
S2 第2面
Claims (14)
- 第1面、該第1面とは反対側に位置する第2面、および前記第2面に開口した凹部を有する、平面視で矩形状の絶縁基板と、
前記第1面に位置する外部電極と、
前記凹部の底面に位置する接続電極と、を備え、
前記外部電極は、
前記第1面の第1の対角線に沿って対向する角部に位置するとともに、前記接続電極と電気的に接続される、第1外部電極および第3外部電極と、
前記第1面の第2の対角線に沿って対向する角部に位置する、第2外部電極および第4外部電極と、を含み、
前記第2外部電極と前記第4外部電極とは、前記絶縁基板の内部に位置し、前記第1面に対して傾斜する部分を含む接続配線によって接続されており、
平面透視において前記第1外部電極と少なくとも一部が重なるとともに、前記第1面から前記底面に向かって延伸する第1貫通導体と、
平面透視において前記第3外部電極と少なくとも一部が重なるとともに、前記第1面から前記底面に向かって延伸する第2貫通導体とをさらに備え、
前記接続電極は、
前記第1貫通導体を介して前記第1外部電極と接続される第1接続電極と、
前記第2貫通導体を介して前記第3外部電極と接続される第2接続電極とを含み、
前記第1接続電極と前記第2接続電極とは、平面透視において前記第1の対角線に沿った位置に位置している、配線基板。 - 前記第1貫通導体は、平面透視において、前記第1外部電極の内部かつ、前記第1接続電極の中央から、前記凹部の内壁と反対方向にずれて位置している、請求項1に記載の配線基板。
- 前記第1貫通導体は、平面透視において、少なくとも一部が前記第1接続電極の外部に位置している、請求項2に記載の配線基板。
- 前記凹部の底面に凸状の浮島部が位置しており、
前記第1接続電極は、前記浮島部に位置している、請求項1から3の何れか1項に記載の配線基板。 - 前記第1貫通導体の前記底面側の端面の一部は、前記第1接続電極と接続されており、
前記第1貫通導体の端面の残りの部分と、前記凹部の底面との間には、絶縁性の被覆部が位置している、請求項1から4の何れか1項に記載の配線基板。 - 前記第1貫通導体の前記底面側の端面と接続されるとともに、少なくとも一部が前記第1面に略平行な面に沿って延在し、平面透視において前記第1貫通導体がその内部に位置する内部配線と、
前記内部配線と前記底面との間に位置し、平面透視において前記第1接続電極に隣接する被覆部と、を備える、請求項1から5の何れか1項に記載の配線基板。 - 前記第1貫通導体の前記底面側の端面と接続されるとともに、少なくとも一部が前記第1面に略平行な面に沿って延在し、平面透視において前記第1貫通導体がその内部に位置する第1内部配線と、
前記第1内部配線と前記底面との間に位置し、平面透視において前記第1貫通導体がその内部に位置する被覆部と、
前記第1内部配線と、前記第1接続電極とを接続する第2内部配線と、を備える、請求項1から6の何れか1項に記載の配線基板。 - 前記第1接続電極及び前記第2接続電極が、前記第2面の中心に対して点対称の位置に位置する、請求項1から7の何れか1項に記載の配線基板。
- 前記接続配線が、平面視で前記第2外部電極から前記第4外部電極まで直線状に延伸する、請求項1から8の何れか1項に記載の配線基板。
- 前記接続配線が、平面視で、前記第2外部電極から前記第4外部電極まで延伸するとともに、前記第1接続電極から離れるように湾曲して延伸する第1部分と、前記第2接続電極から離れるように湾曲して延伸する第2部分とを有している、請求項1から9の何れか1項に記載の配線基板。
- 前記接続配線が、平面視で、前記第2外部電極から前記第3外部電極に向かう方向に沿って延伸する第1部分と、前記第3外部電極から前記第4外部電極に向かう方向に沿って延伸する第2部分と、前記第1外部電極から前記第4外部電極に向かう方向に沿って延伸する第3部分とを有している、請求項1から10の何れか1項に記載の配線基板。
- 前記第1接続電極の形状と前記第2接続電極の形状とが平面視で異なっている、請求項6に記載の配線基板。
- 請求項1~12の何れか1項に記載の配線基板と、
前記配線基板に接続している電子部品と、
を備える電子装置。 - 請求項13に記載の電子装置と、
前記電子装置と接続しているモジュール基板と、
を備える電子モジュール。
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| JP2024549946A JP7784565B2 (ja) | 2022-09-30 | 2023-09-05 | 配線基板、電子装置、及び電子モジュール |
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| JP2015122351A (ja) * | 2013-12-20 | 2015-07-02 | 京セラ株式会社 | 電子部品搭載基板および回路基板 |
| JP2018049988A (ja) * | 2016-09-23 | 2018-03-29 | 京セラ株式会社 | 配線基板、電子装置および電子モジュール |
| WO2019146699A1 (ja) * | 2018-01-24 | 2019-08-01 | 京セラ株式会社 | 配線基板、電子装置及び電子モジュール |
| JP2021034612A (ja) * | 2019-08-27 | 2021-03-01 | 京セラ株式会社 | 電子部品パッケージおよび電子装置 |
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| JP2015122351A (ja) * | 2013-12-20 | 2015-07-02 | 京セラ株式会社 | 電子部品搭載基板および回路基板 |
| JP2018049988A (ja) * | 2016-09-23 | 2018-03-29 | 京セラ株式会社 | 配線基板、電子装置および電子モジュール |
| WO2019146699A1 (ja) * | 2018-01-24 | 2019-08-01 | 京セラ株式会社 | 配線基板、電子装置及び電子モジュール |
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