JP2008051685A - Sensor unit and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and high-reliability sensor unit, and to provide a method for easy manufacturing of the same. <P>SOLUTION: The sensor unit 1 is provided with a multiaxial motion sensor 2, an interposer 3 having a through electrode 53, and a module 4 in which an active element is built, and the multiaxial motion sensor 2, the interposer 3, and the module 4 are arranged in a multistage state, in this order. The multiaxial motion sensor 2 is provided with a sensor body 11, having both a weight 23 supported via beams and contact electrodes arranged in the outside region of the weight; a glass substrate 12 having a prescribed electrode 31; and a prescribed electrode 41 arranged in the interposer 3. The interposer 3 is provided with wirings 54 and 55 and the electrode 41 arranged on a substrate 51, having the through electrode 53, in such a way as to face the sensor body 11. The module 4 has both the active element 65 built in a substrate 61 and a wiring for connecting a through electrode 63 to the active element. The through electrode 63 is jointed to the wiring 55 of the interposer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sensor unit, and more particularly to a sensor unit equipped with a multi-axis motion sensor capable of detecting a multi-axis acceleration component and a multi-axis angular velocity component, and a method for easily manufacturing the sensor unit.

Conventionally, a sensor unit including an image sensor such as a CCD or CMOS, a sensor such as an acceleration sensor, and an active element that controls the sensor has been used for various applications. As such a sensor unit, for example, a sensor built-in module and an active element built-in module are mounted on a wiring board by using connection means such as wire bonding or metal bump, and these are protected by resin sealing. (Patent Document 1).
On the other hand, a combination of a plurality of acceleration sensors, angular velocity sensors, and the like has been used for object motion detection. In response to demands for miniaturization and cost reduction, multi-axis acceleration sensors and angular velocity sensors have progressed, and recently, multi-axis motion sensors that detect acceleration and angular velocity simultaneously have been developed (Patent Documents 2 and 3).
JP 2003-259169 A JP-A-8-68636 JP 2004-69405 A

However, in the conventional sensor unit as described above, since the sensor built-in module mounted on the wiring board is located in a part different from the mounting part of the active element built-in module, it is necessary to expand the surface direction of the wiring board. Met. For this reason, there was a limit to downsizing the sensor unit.
In addition, since the sensor built-in module and the active element built-in module are individually mounted on the wiring board, it is necessary to accurately align each module for mounting at a predetermined position on the wiring board, and the process management is complicated. In addition, when the mounting position is shifted, there is a problem that the reliability of the sensor unit is lowered.
In addition, the sensor may be exposed to high temperatures during mounting, which may cause deterioration in sensor characteristics and sensor unit reliability.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a small and highly reliable sensor unit and a manufacturing method for easily manufacturing such a sensor unit. .

  In order to achieve such an object, the sensor unit of the present invention includes a multi-axis motion sensor, an interposer having a through electrode, and a module with a built-in active element in this order in a multi-stage state. A sensor body composed of an SOI substrate having a three-layer structure of silicon layer / silicon oxide layer / silicon layer, comprising a weight supported via a beam, electrodes disposed on both sides of the weight, and a weight A sensor body having a contact electrode disposed in an outer region, a glass substrate having a predetermined electrode disposed on a surface opposite to the surface facing the interposer of the sensor body, and facing the sensor body. A predetermined electrode disposed on the interposer, and the interposer includes a substrate having a through electrode and the sensor on the substrate. -It is provided with the electrode arranged so as to face the main body and wiring arranged on both surfaces of the substrate, and is joined to the sensor main body via an annular joining member in a region outside the wiring. The weight is hermetically sealed, the wiring on the multi-axis motion sensor side is joined to a contact electrode of the sensor body, the active element built-in module includes a substrate, an active element built in the substrate, A plurality of through-electrodes penetrating the substrate located in a region outside the active element, and a wiring connecting the through-electrode and the active element, wherein the through-electrode is the wiring of the interposer It was set as the structure joined to.

As another aspect of the present invention, the joining member includes any one of an Al / Cr laminate, an Al / Ti laminate, and an Al / Au laminate, an Al / Au laminate, an Al / Sn—Au alloy laminate, And it was set as the structure which was what was joined with the any metal layer of an Al / Sn-Ag alloy lamination.
As another aspect of the present invention, the joining member includes a joining bump and a metal layer sandwiching the joining bump, and the joining bump is made of conductive powder of any of Au, Ag, Cu, Sn, or an alloy thereof. The conductive paste having a resin component or a conductive material of any one of Au, Ag, Cu, and Sn is used.

  The sensor unit of the present invention includes an active element built-in module and a multi-axis motion sensor bonded on the active element built-in module, and the multi-axis motion sensor is composed of silicon layer / silicon oxide layer / silicon layer 3. A sensor body comprising an SOI substrate having a layer structure, a weight supported via a beam, electrodes disposed on both sides of the weight, and contact electrodes disposed on a region outside the weight A sensor body, a glass substrate disposed on a surface of the sensor body opposite to the surface facing the active element built-in module and having a predetermined electrode, and the active element built-in module facing the sensor body. The active element built-in module is disposed on the substrate so as to face the sensor main body. A recording electrode; an active element built in the substrate; and a plurality of penetrating electrodes located in a region outside the active element and penetrating the substrate; and connecting the through electrode and the active element The wiring body has a wiring, and the weight is hermetically sealed in an area outside the wiring through an annular bonding member, and the through electrode is bonded to a contact electrode of the sensor body. The configuration is as follows.

As another aspect of the present invention, the joining member includes any one of an Al / Cr laminate, an Al / Ti laminate, and an Al / Au laminate, an Al / Au laminate, an Al / Sn—Au alloy laminate, And it was set as the structure which was what was joined with the any metal layer of an Al / Sn-Ag alloy lamination.
As another aspect of the present invention, the joining member includes a joining bump and a metal layer sandwiching the joining bump, and the joining bump is made of conductive powder of any of Au, Ag, Cu, Sn, or an alloy thereof. The conductive paste having a resin component or a conductive material of any one of Au, Ag, Cu, and Sn is used.

  The manufacturing method of the sensor unit according to the present invention divides an SOI wafer having a three-layer structure of silicon layer / silicon oxide layer / silicon layer and one glass wafer into multiple faces, and for each of the faces, A multi-axis multi-axis motion sensor semi-finished product having a laminated structure in which a glass substrate formed on a glass wafer is bonded to one surface of a sensor body formed on an SOI wafer by applying desired processing to The interposer wafer is divided into multiple faces, a plurality of fine through holes are formed for each face, a conductive material is disposed in the fine through holes to form through electrodes, and desired wiring connected to the through electrodes , Forming electrodes for multi-axis motion sensors and fabricating the interposer by multiple imposition, and dividing the wafer for the active element built-in module into multiple imposition, and for each imposition For forming a plurality of fine through holes in a region outside the active element, disposing a conductive material in the fine through hole as a through electrode, and connecting the through electrode and the active element Forming the active element built-in module by multi-surface mounting, and forming the interposer with the multi-axis motion sensor half so that the electrode for the multi-axis motion sensor faces the sensor body for each surface mounting. Join the product in a ring shape by metal joining method or paste bump joining method, and simultaneously join the wiring of the interposer and the desired part of the sensor body to complete the multi-axis motion sensor and wiring on the other side of the interposer Joining the through electrode of the module with a built-in active element to form a multi-sided sensor unit, and a multi-sided sensor unit A step of dicing the Tsu bets, was such as to have configure.

  In addition, the manufacturing method of the sensor unit according to the present invention divides an SOI wafer having a three-layer structure of silicon layer / silicon oxide layer / silicon layer and one glass wafer into multiple faces, and each side of the wafer is divided into multiple faces. A multi-axis motion sensor semi-finished product having a laminated structure in which a glass substrate formed on a glass wafer is bonded to one surface of a sensor body formed on an SOI wafer by performing desired processing for each attachment Process, interposer wafer is divided into multiple impositions, electrodes for multi-axis motion sensors and desired wiring are formed for each imposition, and then for each imposition, the electrodes for multi-axis motion sensors are The interposer wafer is annularly formed on the multi-axis motion sensor semi-finished product by metal bonding or paste bump bonding so as to face the sensor body. At the same time, the wiring of the interposer wafer and the desired part of the sensor body are joined together to complete a multi-axis motion sensor, and then a plurality of fine patterns are exposed so that the wiring is exposed from the opposite surface to the interposer wafer. A step of forming a through-hole, disposing a conductive material in the fine through-hole to form a through-electrode, forming a desired wiring connected to the through-electrode, and producing an interposer with multiple faces; The wafer for use is divided into multiple impositions, an active element is built in each imposition, a plurality of fine through holes are formed in the area outside the active element, and a conductive material is disposed in the fine through holes to penetrate Forming a wiring for connecting the through electrode and the active element as an electrode to fabricate a module with a built-in active element by multiple imposition, and for each imposition, the wiring of the interposer and the front By joining a through electrode of the active element built-in module, and a step of a multi with a sensor unit, a step of dicing the multi with the sensor unit, and that have configure.

  In addition, the manufacturing method of the sensor unit according to the present invention divides an SOI wafer having a three-layer structure of silicon layer / silicon oxide layer / silicon layer and one glass wafer into multiple faces, and each side of the wafer is divided into multiple faces. A multi-axis motion sensor semi-finished product having a laminated structure in which a glass substrate formed on a glass wafer is bonded to one surface of a sensor body formed on an SOI wafer by performing desired processing for each attachment The process and the active element built-in module wafer are divided into multiple faces, each of the faces has an active element built therein, a plurality of fine through holes are formed in the outer area of the active element, and the fine through holes are electrically conductive. A material is arranged to form a through electrode, and a wiring for connecting the through electrode and the active element and an electrode for a multi-axis motion sensor are formed to produce a module with a built-in active element by multi-sided attachment. And, for each imposition, the module with a built-in active element is annularly attached to the multi-axis motion sensor semi-finished product by metal bonding or paste bump bonding so that the electrode for the multi-axis motion sensor faces the sensor body. And simultaneously joining the through electrode of the module with a built-in active element and a desired part of the sensor body to complete a multi-axis motion sensor, thereby forming a multi-sided sensor unit, and a multi-sided sensor unit. And a dicing step.

  In addition, the manufacturing method of the sensor unit according to the present invention divides an SOI wafer having a three-layer structure of silicon layer / silicon oxide layer / silicon layer and one glass wafer into multiple faces, and each side of the wafer is divided into multiple faces. A multi-axis motion sensor semi-finished product having a laminated structure in which a glass substrate formed on a glass wafer is bonded to one surface of a sensor body formed on an SOI wafer by performing desired processing for each attachment The process and the active element built-in module wafer are divided into multiple impositions, the electrodes for the multi-axis motion sensor and the desired wiring are formed for each imposition, and then for each imposition, for the multi-axis motion sensor The module wafer with built-in active element is attached to the multi-axis motion sensor semi-finished product by metal bonding or paste bump so that the electrode faces the sensor body. Are joined together in a ring, and at the same time, the wiring of the wafer for the active element built-in module and the desired part of the sensor body are joined together to complete a multi-axis motion sensor, and then an active element is built in for each imposition. In addition, a plurality of fine through holes are formed in the outer region of the active element so that the wiring is exposed from the opposite surface of the active element built-in module wafer, and a conductive material is disposed in the fine through hole. Forming a through-electrode, wiring for connecting the through-electrode and the active element to produce a module with a built-in active element by multi-surface mounting, and forming a multi-surface sensor unit; and And a dicing step.

Such a sensor unit of the present invention has a structure in which a multi-axis motion sensor, an interposer, and an active element built-in module are joined in a multistage state, or an active element built-in module and a multi-axis motion sensor are joined together. In addition, the substrate is not provided, and a part of the electrodes constituting the multi-axis motion sensor is disposed in the interposer or the active element built-in module, that is, a part of the interposer or the active element built-in module is part of the multi-axis motion sensor. Since the parts are configured, the area and height can be greatly reduced.
In addition, the manufacturing method of the present invention includes a batch assembly for joining a multi-axis motion sensor semi-finished product, an interposer, and an active element built-in module at a wafer level, or a multi-axis motion sensor semi-finished product and an active element built-in module at a wafer level. As a result, it is easy to manage the process and reduce the manufacturing cost. Also, since the bonding is performed using the metal bonding method or paste bump bonding method, multi-axis motion is possible. The influence of heat on the sensor can be prevented, and a highly reliable sensor unit can be manufactured.

Embodiments of the present invention will be described below with reference to the drawings.
[Sensor unit]
(First embodiment)
FIG. 1 is a schematic cross-sectional view showing an embodiment of a sensor unit of the present invention. In FIG. 1, a sensor unit 1 of the present invention is a multi-axis motion sensor 2, an interposer 3, and an active element built-in module 4 joined in this order in a multistage state. The multi-axis motion sensor 2 and the interposer 3 are hermetically sealed with an annular sealing member 5, and a sealing resin layer 6 is interposed in the gap between the interposer 3 and the active element built-in module 4. .

  The multi-axis motion sensor 2 constituting the sensor unit 1 is a conventionally known multi-axis motion sensor, for example, a 5-axis motion sensor of MEMS (Micro Electromechanical System) type capable of simultaneously detecting a 3-axis acceleration component and a 2-axis angular velocity component, pressure It may be an optical sensor such as a sensor or an image sensor, and is not particularly limited. In the illustrated example, the multi-axis motion sensor 2 includes a sensor body 11 and a glass substrate 12, and electrodes 41 constituting the multi-axis motion sensor 2 are disposed in the interposer 3.

  2 shows a state where the sensor body 11 and the glass substrate 12 constituting the multi-axis motion sensor 2 shown in FIG. 1 are separated from each other, and the interposer 3 including the electrodes 41 constituting the multi-axis motion sensor 2 is further separated. It is an enlarged view shown. As shown in FIG. 2, the sensor body 11 includes an SOI (Silicon On Insulator) substrate 15 having a three-layer structure in which a silicon oxide layer 17 is sandwiched between a silicon layer 16 (active layer silicon) and a silicon layer 18 (substrate silicon). Consists of. FIG. 3 is a plan view from the silicon layer 16 (active layer silicon) side of the sensor body 11, and FIG. 4 is a plan view from the silicon layer 18 (substrate silicon) side. And the sensor main body 11 shown by FIG. 1, FIG. 2 has shown the longitudinal cross-sectional shape in the II line | wire in FIG. FIG. 5 shows a vertical cross-sectional shape taken along line II-II in FIG.

  As shown in FIGS. 1 to 5, the sensor body 11 includes a frame member 21, a cross-shaped beam 22 made of a silicon layer 16 (active layer silicon), and a weight 23 supported by the four beams 22. A plurality (12 in the illustrated example) of column members 24 are provided independently in four regions surrounded by the frame member 21 and the beams 22. The weight 23 supported by the four beams 22 is hermetically sealed at, for example, about 0.01 to 1 Pa by the frame member 21 and the interposer 3 being joined via the annular joining member 5. It is in. 3 and 4 show an annular joining member 30 (described later) that constitutes the annular joining member 5.

  The weight 23 is thinner than the frame member 21 and the column member 24, has an electrode 25 and a contact electrode 26 on the silicon layer 16 (active layer silicon) side, and is on the silicon layer 18 (substrate silicon) side. Has an electrode 27. 3 and 4, the electrode 25 and the electrode 27 are indicated by hatching. The electrodes 25 and 27 have a pattern shape having base portions 25a and 27a and four projecting portions 25b and 27b projecting between the cross-shaped beams 22 from the base portions 25a and 27a. Further, the contact electrode 26 penetrates the silicon oxide layer 17 and is connected to the silicon layer 18 (substrate silicon), whereby conduction between the silicon layer 16 (active layer silicon) and the silicon layer 18 (substrate silicon) is achieved. Therefore, the contact electrode 26 (electrode 25) and the electrode 27 are electrically connected.

  Each column member 24 has a contact electrode 28 on the silicon layer 16 (active layer silicon) side, and a contact electrode 29 on the silicon layer 18 (substrate silicon) side. The contact electrode 28 penetrates through the silicon oxide layer 17 and is connected to the silicon layer 18 (substrate silicon). Thereby, in each pillar member 24, conduction between the silicon layer 16 (active layer silicon) and the silicon layer 18 (substrate silicon), and therefore conduction between the contact electrode 28 and the contact electrode 29 is established.

  The glass substrate 12 constituting the multi-axis motion sensor 2 has an electrode 31 on the surface bonded to the sensor body 11. FIG. 6 is a plan view of the glass substrate 12 on the side where the electrodes 31 are provided. And the glass substrate 12 shown by FIG. 1, FIG. 2 has shown the longitudinal cross-sectional shape in the II line | wire in FIG. As shown in FIGS. 1, 2, and 6, the electrode 31 includes a cross-shaped center electrode 32 and four peripheral electrodes 33 arranged so as to surround the center electrode 32. The center electrode 32 is opposed to the base 25a of the electrode 25 formed on the weight 23 with a desired gap therebetween, and the four peripheral electrodes 33 are four of the electrodes 25 formed on the weight 23. It faces the protruding portion 25b with a desired gap therebetween.

  On the other hand, FIG. 7 is a plan view showing an electrode 41 constituting the multi-axis motion sensor 2 disposed in the interposer 3, a through electrode 53 described later, and an annular joining member 56 constituting the annular joining member 5. is there. The interposer 3 shown in FIGS. 1 and 2 has a vertical cross-sectional shape taken along line II in FIG. As shown in FIGS. 1, 2, and 7, the electrode 41 includes one cross-shaped center electrode 42 and four peripheral electrodes 43 disposed so as to surround the center electrode 42. The center electrode 42 is opposed to a base portion 27a of the electrode 27 formed on the weight 23 with a desired gap therebetween, and the four peripheral electrodes 43 are four of the electrodes 27 formed on the weight 23. It faces the protrusion 27b with a desired gap. Further, the through electrode 53 is disposed at a position corresponding to the column member 24 of the sensor body 11, and each through electrode 53 is connected to the contact electrode of each column member 24 via a wiring 54 not shown in FIG. 7. 29.

  The multi-axis motion sensor 2 as described above is displaced to the weight 23 when acceleration acts on the weight 23 supported by the four beams 22 in the X-axis, Y-axis, or Z-axis (see FIG. 1) direction. Occurs. Due to this displacement, the capacitance between the four peripheral electrodes 33 of the glass substrate 12 and the four protrusions 25 b of the electrode 25 of the weight 23, and the four peripheral electrodes 43 of the interposer 3 and the weight 23. The electrostatic capacitance between the four protruding portions 27b of the electrode 27 changes, and a triaxial acceleration component is obtained by the change amount of the electrostatic capacitance. In the multi-axis motion sensor 2, between the center electrode 32 of the glass substrate 12 and the base portion 25 a of the electrode 25 of the weight 23, and between the center electrode 42 of the interposer 3 and the base portion 27 a of the electrode 27 of the weight 23. When an AC signal having a phase difference of 180 ° is added, the weight 23 supported by the four beams 22 vibrates in the Z-axis with a Coulomb force. In this state, when an angular velocity around the Y axis acts on the weight 23, a Coriolis force is generated in the X axis direction, and when an angular velocity around the X axis acts on the weight 23, a Coriolis force is generated in the Y axis direction. As for the biaxial angular velocity component, the displacement of the weight 23 in the X-axis direction and the Y-axis direction can be detected by a change in capacitance. It should be noted that the acceleration detection and the angular velocity detection due to the change in capacitance can be discriminated by setting the angular velocity detection to a high frequency region and the acceleration detection to a low frequency region. The operation principle of the multi-axis motion sensor 2 described above is described in, for example, the theory of electronics E.E. 126, No. 6, 2006.

The interposer 3 constituting the sensor unit 1 includes a substrate 51, a plurality of fine through holes 52 provided in the substrate 51, through electrodes 53 disposed in these fine through holes 52, and the like The electrode 41 constituting the multi-axis motion sensor 2, the wiring 54, and the annular joint member 56 constituting the annular joint member 5 are provided on the surface facing the multi-axis motion sensor 2. Examples of the material of the substrate 51 include silicon and glass. The fine through hole 52 has an opening diameter of 1 to 50 μm, preferably about 5 to 30 μm. The shape of the fine through-hole 52 is a straight shape having a substantially constant inner diameter in the thickness direction in the illustrated example, but is not limited to this, and has a tapered shape with one wide opening diameter, substantially at the center in the thickness direction. A shape or the like having a narrow inner diameter may be used.
The through electrode 53 disposed in the fine through hole 52 as described above may be filled in the fine through hole 52, or formed on the inner wall surface of the fine through hole 52. Or a thing with a recessed part may be sufficient. The material of the through electrode 53 can be a conductive material such as Au, Ag, Cu, or Sn.

  In addition, the board | substrate 51 may have an electrically insulating layer in the whole region including the inner wall face of the fine through-hole 52, or a desired area | region, for example, the interposer 3 shown by FIG. In the interposer 3, the substrate 51 has a plurality of fine through holes 52, and an electrical insulating layer 58 is provided over the entire region including the inner wall surfaces of these fine through holes 52. A through electrode 53 is provided in the fine through hole 52, and an electrode 41 constituting the multi-axis motion sensor 2 as described above, a wiring 54, and an annular member constituting the annular bonding member 5 are provided on one surface. A joining member 56 is provided, and a wiring 55 is provided on the other surface. In such an interposer 3, the electrical insulating layer 58 can be made of, for example, an inorganic oxide such as silicon oxide or silicon nitride. In the illustrated example, the through electrode 53 is formed on the inner wall surface of the fine through hole 52 and has a recess. However, the through electrode 53 may be filled in the fine through hole 52 as in the above example. .

The interposer 3 has an annular (corridor-shaped) joining member 56 at the periphery, and this joining member 56 is joined to the joining member 30 disposed on the frame member 21 of the sensor body 11 described above. The member 5 is configured, and the inside of the sensor body 11 in which the weight 23 exists is hermetically sealed by the bonding member 5. The wiring 54 located on the surface facing the multi-axis motion sensor 2 is joined to the contact electrode 29 of the sensor body of the multi-axis motion sensor 2.
The interposer 3 has a wiring 55 on the surface facing the active element built-in module 4, and the wiring 55 is bonded to a wiring 64 of the active element built-in module 4 described later via a bonding bump 57. ing. Note that the wiring 55 of the interposer 3 may be directly bonded (not the wiring 64) to the through electrode 63 of the active element built-in module 4 to be described later via the bonding bump 57.

  FIG. 9 is a partially enlarged view for explaining an example of the joining of the frame member 21 of the sensor body 11 and the interposer 3 by the annular joining member 5 and the joining of the contact electrode 29 of the sensor body 11 and the wiring 54 of the interposer 3. It is sectional drawing. In the example shown in FIG. 9, the annular joining member 5 is obtained by joining the annular joining member 30 provided in the frame member 21 of the sensor body 11 and the annular joining member 56 provided in the interposer 3. The joining member 30 is a laminate of the metal layer 30a and the metal layer 30b, and can be, for example, an Al / Cr laminate, an Al / Ti laminate, an Al / Au laminate, or the like. The joining member 56 is a laminate of the metal layer 56a and the metal layer 56b, and can be, for example, an Al / Au laminate, an Al / Sn—Au alloy laminate, an Al / Sn—Ag alloy laminate, or the like.

The contact electrode 29 is a laminate of a metal layer 29a and a metal layer 29b, and can be, for example, an Al / Cr laminate, an Al / Ti laminate, an Al / Au laminate, or the like. Further, the wiring 54 of the interposer 3 is a laminate of a metal layer 54a and a metal layer 54b, and can be, for example, an Al / Au laminate, an Al / Sn—Au alloy laminate, an Al / Sn—Ag alloy laminate, or the like. .
The shape of the joining member 5 is not particularly limited as long as it is an annular shape capable of hermetically sealing the inside of the sensor body 11 in which the weight 23 is present. ing. Further, the thickness and width of the joining member 5 are not limited, and can be appropriately set within a range of, for example, a thickness of 1 to 30 μm and a width of 10 to 300 μm. The joining of the frame member 21 of the sensor body 11 and the interposer 3 and the joining of the contact electrode 29 of the sensor body 11 and the wiring 54 of the interposer 3 by such a metal joining method are stably performed at a temperature of 400 ° C. or lower. be able to.

  FIG. 10 illustrates another example of joining of the frame member 21 of the sensor body 11 and the interposer 3 by the annular joining member 5 and joining of the contact electrode 29 of the sensor body 11 and the wiring 54 of the interposer 3. It is a partial expanded sectional view for this. In the example shown in FIG. 10, the annular bonding member 5 is formed by bonding an annular bonding member 30 included in the frame member 21 of the sensor body 11 and an annular bonding member 56 included in the interposer 3 via bonding bumps 56 ′. It has been done. Further, the contact electrode 29 and the wiring 54 are bonded via a bonding bump 54 '. These areas are sealed with a sealing resin 60. The material of the joining member 30 and the joining member 56 can be, for example, Au, Ag, Cu, Sn, or the like. Further, the bonding bump 56 ′ is made of, for example, a conductive paste having a conductive powder and a resin component of Au, Ag, Cu, Sn or the like, or an alloy thereof, or Au, Ag, Cu , Sn or the like may be used.

The material of the contact electrode 29 and the wiring 54 can be, for example, Au, Ag, Cu, Sn, or the like. The bonding bump 54 'is made of, for example, a conductive paste having a conductive powder and a resin component of Au, Ag, Cu, Sn or the like, or an alloy thereof, or Au, Ag, Cu. , Sn or the like may be used.
On the other hand, as the sealing resin 60, for example, an insulating resin material, an anisotropic conductive resin, or the like can be used.

  The shape of the joining member 5 in this example is not particularly limited as long as it is an annular shape that can hermetically seal the inside of the sensor body 11 in which the weight 23 exists, and in the illustrated example, the corridor corresponding to the frame member 21 of the sensor body. It has a shape. Further, the thickness and width of the joining member 5 are not limited, and can be appropriately set within a range of, for example, a thickness of 1 to 30 μm and a width of 10 to 300 μm. The bonding between the frame member 21 of the sensor main body 11 and the interposer 3 and the bonding between the contact electrode 29 of the sensor main body 11 and the wiring 54 of the interposer 3 by such paste bump bonding method are stably performed at a temperature of 200 ° C. or less. It can be carried out.

  The active element built-in module 4 constituting the sensor unit 1 includes a substrate 61, an active element 65 built in the substrate 61, and a plurality of fine through holes 62 formed in the substrate 61 in a region outside the active element 65. And a through electrode 63 disposed in these fine through holes 62. A wiring 64 connected to the through electrode 63 is disposed on the surface of the substrate 61 facing the interposer 3. In addition, on the surface opposite to the surface facing the interposer 3 of the substrate 61, wiring (not shown) connecting a desired terminal (not shown) of the active element 65 and a desired through electrode 63 is provided. It is arranged. Then, solder bumps 66 as external terminals are disposed at desired locations of these wirings.

Examples of the material of the substrate 61 include silicon and glass. The fine through hole 62 has an opening diameter of 1 to 50 μm, preferably about 5 to 30 μm. The shape of the fine through-hole 62 is a straight shape having a substantially constant inner diameter in the thickness direction in the illustrated example, but is not limited to this, and has a tapered shape with one wide opening diameter, substantially at the center in the thickness direction. A shape or the like having a narrow inner diameter may be used.
The through electrode 63 disposed in the fine through hole 62 as described above may be filled in the fine through hole 62, and is formed on the inner wall surface of the fine through hole 62. Or a thing with a recessed part may be sufficient. The material of the through electrode 63 can be a conductive material such as Au, Ag, Cu, or Sn.

The wiring 56 of the interposer 3 via the bonding bump 57 and the through electrode 63 and the wiring 64 of the module with built-in active element 4 are bonded to the contact electrode 29 of the multi-axis motion sensor 2 and the interposer 3 via the above-described bonding bump 54 ′. It can be the same as the bonding with the wiring 54 (paste bump bonding method). Further, the interconnection 56 of the interposer 3 and the through electrode 63 and the interconnection 64 of the active element built-in module 4 can be joined by a metal joining method as shown in FIG.
The sensor unit 1 as described above has a structure in which a multi-axis motion sensor 2, an interposer 3 and an active element built-in module 4 are joined in a multi-stage state, does not include a wiring board, and constitutes the multi-axis motion sensor 2. Part of the electrode (electrode 41) to be disposed on the interposer 3, and part of the interposer 3 constitutes part of the multi-axis motion sensor 2, so that the area and height can be greatly reduced in size. Become.

(Second Embodiment)
FIG. 11 is a schematic cross-sectional view showing another embodiment of the sensor unit of the present invention. In FIG. 11, a sensor unit 71 of the present invention is a multi-axis motion sensor 2 and an active element built-in module 74 joined together.
The multi-axis motion sensor 2 constituting the sensor unit 71 is a conventionally known multi-axis motion sensor, for example, a MEMS type 5-axis motion sensor capable of simultaneously detecting a 3-axis acceleration component and a 2-axis angular velocity component, a pressure sensor, an image sensor, etc. There is no particular limitation. In the illustrated example, the multi-axis motion sensor 2 that constitutes the sensor unit 71 is the same as the multi-axis motion sensor 2 that constitutes the sensor unit 1 described above, and includes a sensor body 11 and a glass substrate 12, and this multi-axis motion sensor 2 An electrode 81 constituting the sensor 2 is disposed in the active element built-in module 74. The multi-axis motion sensor 2 shown in FIG. 11 is given the same member number as that of the multi-axis motion sensor 2 constituting the sensor unit 1 except for the electrode 81, and the description thereof is omitted here.

The active element built-in module 74 is joined to the frame member 21 of the sensor main body 11 by the annular joint member 5 ′, and the weight 23 supported by four beams (not shown) is, for example, 0.01. It is in an airtight sealed state of about 1 Pa.
The active element built-in module 74 constituting the sensor unit 71 includes a substrate 91, an active element 95 built in the substrate 91, and a plurality of fine through holes 92 formed in the substrate 91 in a region outside the active element 95. And through electrodes 93 disposed in these fine through holes 92. Furthermore, on the surface of the substrate 91 that faces the multi-axis motion sensor 2, the electrode 81 that constitutes the multi-axis motion sensor 2 as described above, the wiring 94, and the annular joint member that constitutes the annular joint member 5 '. 97 are arranged. A wiring (not shown) for connecting a desired terminal (not shown) of the active element 95 and a desired penetrating electrode 93 is provided on the surface of the substrate 91 opposite to the surface facing the multi-axis motion sensor 2. Is arranged. Then, solder bumps 96 as external terminals are disposed at desired locations of these wirings.

The electrode 81 constituting the multi-axis motion sensor 2 arranged in the active element built-in module 74 is the same as the electrode 41 constituting the multi-axis motion sensor 2 arranged in the interposer 3 in the above-described embodiment. be able to. That is, the electrode 81 includes one cross-shaped center electrode 82 and four peripheral electrodes 83 arranged so as to surround the center electrode 82.
The shape and opening diameter of the fine through hole 92 and the material and shape of the through electrode 93 can be the same as those of the fine through hole 62 and the through electrode 63 described above.
The annular joining member 97 disposed in the active element built-in module 74 can be the same as the annular joining member 56 disposed in the interposer 3 in the above-described embodiment. The wiring 94 can be the same as the wiring 54 provided in the interposer 3 in the above-described embodiment.

  FIG. 12 shows an example of the joining of the frame member 21 of the sensor body 11 and the active element built-in module 74 by the annular joining member 5 ′ and the joining of the contact electrode 29 of the sensor body 11 and the wiring 94 of the active element built-in module 74. It is a partial expanded sectional view for demonstrating. In the example shown in FIG. 12, the annular joint member 5 ′ is obtained by joining the annular joint member 30 included in the frame member 21 of the sensor body 11 and the annular joint member 97 included in the active element built-in module 74. It is. The joining member 30 is a laminate of the metal layer 30a and the metal layer 30b, and can be the same as the joining member 30 in the above-described embodiment. The joining member 97 is a laminate of the metal layer 97a and the metal layer 97b, and can be the same as the joining member 56 in the above-described embodiment.

The contact electrode 29 is a laminate of a metal layer 29a and a metal layer 29b, and can be the same as the contact electrode 29 of the above-described embodiment. The wiring 94 of the active element built-in module 74 is a laminate of the metal layer 94a and the metal layer 94b, and can be the same as the wiring 54 of the above-described embodiment.
The shape of the joining member 5 ′ is not particularly limited as long as it is an annular shape capable of hermetically sealing the inside of the sensor body 11 in which the weight 23 exists, and in the illustrated example, the shape of the corridor corresponding to the frame member 21 of the sensor body is It has become. Further, the thickness and width of the joining member 5 ′ are not limited, and can be appropriately set within a range of 1 to 30 μm in thickness and 10 to 300 μm in width. The joining of the frame member 21 of the sensor body 11 and the active element built-in module 74 and the joining of the contact electrode 29 of the sensor body 11 and the wiring 94 of the active element built-in module 74 by such a metal joining method are performed at 400 ° C. or lower. It can be carried out stably at temperature.

Further, the joining of the frame member 21 of the sensor body 11 and the active element built-in module 74 and the joining of the contact electrode 29 and the wiring 94 of the sensor body 11 by the annular joining member 5 ′ are shown in the above embodiment. 10 may be the same as described in FIG.
The active element built-in module 74 may be the one shown in FIG. In the active element built-in module 74, the substrate 91 includes an electrical insulating layer 98 on both surfaces and the inner wall surfaces of the plurality of fine through holes 92. Then, on the electrical insulating layer 98 on the multi-axis motion sensor 2 side, the electrode 81 constituting the multi-axis motion sensor 2 as described above, the wiring 94, and the annular joining member 97 constituting the annular joining member 5 ′. have. In such an active element built-in module 74, the electrical insulating layer 98 can be made of, for example, an inorganic oxide such as silicon oxide or silicon nitride. In the illustrated example, the through electrode 93 is formed on the inner wall surface of the fine through hole 92 and has a concave portion. However, the through electrode 93 may be filled in the fine through hole 92 as in the above example. .

The sensor unit 71 as described above has a structure in which the multi-axis motion sensor 2 and the active element built-in module 74 are joined, does not include a wiring board, and further, a part of electrodes constituting the multi-axis motion sensor 2. Since the (electrode 81) is disposed in the active element built-in module 74 and a part of the active element built-in module 74 constitutes a part of the multi-axis motion sensor 2, the area and height can be greatly reduced in size. It becomes.
The embodiments of the sensor unit described above are examples, and the sensor unit of the present invention is not limited to these. For example, in the active element built-in module 4 and the active element built-in module 74, the active elements 65 and 95 may be disposed on the multi-axis motion sensor 2 side of the substrates 61 and 91.

[Method for manufacturing sensor unit]
(First embodiment)
Next, a method for manufacturing the sensor unit of the present invention will be described using the sensor unit 1 shown in FIG. 1 as an example.
14 and 15 are process diagrams showing an embodiment of a method for producing a sensor unit of the present invention. In the present invention, first, a multi-axis motion sensor semi-finished product 2 'is manufactured by multiple imposition. That is, an SOI (Silicon On Insulator) wafer 15 'having a three-layer structure of a silicon layer 16 (active layer silicon), a silicon oxide layer 17, and a silicon layer 18 (substrate silicon), and a glass wafer 12' are multifaceted (each The imposition portion is partitioned into 1A) (FIG. 14A). These are subjected to desired processing for each imposition 1A, and the glass substrate 12 formed on the glass wafer 12 'is bonded to one surface of the sensor body 11 formed on the SOI wafer 15'. A multi-axis motion sensor semi-finished product 2 ′ having a laminated structure is produced by multi-faceting (FIG. 14B).

Here, an example of the manufacturing process of the multi-faceted multi-axis motion sensor semi-finished product 2 ′ will be described with reference to FIGS.
First, an oxidation process is performed on an SOI wafer 15 ′ having a three-layer structure of a silicon layer 16 (active layer silicon), a silicon oxide layer 17, and a silicon layer 18 (substrate silicon), and the oxide layer 16 is formed on both surfaces of the SOI wafer 15 ′. 'And 18' are formed (FIG. 16A). Thereafter, the recesses 7a, 7b, and 8 are formed in a desired pattern by pattern etching for each imposition 1A of the SOI wafer 15 '(FIG. 16B). This pattern etching can be performed, for example, by forming a mask pattern on the oxide layers 16 ′ and 18 ′ and using a sand blast method, a wet etching method, or the like.

Next, oxide layers 16 'and 18' are formed again on both sides of the SOI wafer 15 'in which the recesses 7a, 7b and 8 are formed, and then contact holes 9a and 9b are formed in desired portions of the silicon layer 16 (FIG. 16 (C)). The contact holes 9a and 9b can be formed, for example, by forming a mask pattern on the oxide layer 16 'and using a sand blast method, a wet etching method, or the like.
Next, the groove 10 for forming the frame member 21, the cross beam 22 and the plurality of column members 24 (see FIG. 3) is formed in the silicon layer 16 (FIG. 16D). The groove 10 is formed by, for example, an ICP-RIE (Inductively Coupled Plasma-Reactive Ion Etching) method, which is a dry etching method using plasma, through a mask pattern. it can. Moreover, the groove part 10 can also be formed by a sandblasting method, a wet etching method, or a femtosecond laser method.

Next, the silicon oxide layer 17 exposed in the contact holes 9a and 9b and the groove 10 is removed, and the oxide layer 16 'is removed, and contact electrodes 26 and 28 are formed in the contact holes 9a and 9b. An electrode 25 is formed in the concave portion 7a surrounded by 10 (a portion that becomes the weight 23 in a later step) (FIG. 16E). The removal of the silicon oxide layer 17 and the oxide layer 16 ′ can be performed, for example, by dry etching using a reactive gas. Further, as shown in FIG. 3, the electrode 25 protrudes between a base portion 25a and a groove portion (not shown in FIG. 16E) for forming the beam 22 from the base portion 25a 4. It consists of a single protrusion 25b.
On the other hand, for each imposition 1A of the glass wafer 12 ′, an electrode 31 comprising one cross-shaped center electrode 32 and four peripheral electrodes 33 arranged so as to surround the center electrode 32 is formed (FIG. 17 (A)). Next, the glass wafer 12 'and the silicon layer 16 (active layer silicon) of the SOI wafer 15' are anodically bonded (FIG. 17B).

  Next, the oxide layer 18 ′ on the silicon layer 18 (substrate silicon) of the SOI wafer 15 ′ is removed, an electrode 27 is formed in the recess 8, and an electrode 29, a desired portion on the silicon layer 18 (substrate silicon), An annular joining member 30 is formed (FIG. 17C). The removal of the oxide layer 18 'can be performed in the same manner as the removal of the oxide layer 16' described above. Further, as shown in FIG. 4, the electrode 27 protrudes between a base portion 27a and a groove portion (not shown in FIG. 17C) for forming the cross-shaped beam 22 from the base portion 27a. It consists of four protrusions 27b.

Next, the silicon layer 18 (substrate silicon) corresponding to the groove 10 for forming the frame member 21, the cross-shaped beam 22 and the plurality of column members 24 is etched and penetrated to the groove 10. Thereby, the frame member 21, the cross-shaped beam 22, the weight 23 supported by the beam 22, and a plurality of column members 24 as shown in FIGS. 3 and 4 are formed (FIG. 17D). )). The cross-shaped beam 22 formed in this way is made of the silicon layer 16 (active layer silicon), and the column member 24 is made of the silicon layer 16 (active layer silicon), the silicon oxide layer 17, and the silicon layer 18 (substrate). Silicon). The etching of the silicon layer 18 (substrate silicon) can be performed by, for example, an ICP-RIE method through a mask pattern. Moreover, it can also carry out by the sandblasting method, the wet etching method, and the femtosecond laser method.
As a result, a multi-axis motion sensor semi-finished product 2 'having a laminated structure in which the glass substrate 12 formed on the glass wafer 12' is arranged on the sensor body 11 formed on the SOI wafer 15 'is produced in a multi-faceted manner.

  In the manufacturing method of the sensor unit of the present invention, the interposer 3 is produced by multi-faceting as in the multi-axis motion sensor semi-finished product 2 ′ (FIG. 14C). That is, the interposer wafer 3 ′ is divided into multiple impositions (each imposition portion is indicated by 1 A), and a plurality of fine through holes 52 are formed for each imposition 1 A, and a conductive material is disposed in the fine through holes 52. The through electrode 53 is provided. Further, an electrode 41 (cross-shaped center electrode 42 and four surrounding electrodes 43 shown in FIG. 7), a wiring 54, and an annular shape are formed on one surface of the interposer wafer 3 '. The joining member 56 is formed, the wiring 55 and the joining bumps 57 are formed on the other surface, and the interposer 3 is manufactured with multiple faces.

The fine through hole 52 can be formed by, for example, an ICP-RIE method through a mask pattern. Further, the fine through holes 52 can be formed by a sandblast method, a wet etching method, or a femtosecond laser method. Further, micropores are formed in the interposer wafer 3 ′ at a predetermined depth from one surface by any of the methods described above, and then the opposite surface of the interposer wafer 3 ′ is polished to expose the micropores. By doing so, the fine through holes 52 may be formed. The opening diameter of the fine through hole 52 can be set in the range of 1 to 50 μm, preferably 5 to 30 μm.
The through electrode 53 is formed in the fine through hole 52 by, for example, forming a base conductive thin film in the fine through hole 52 by a plasma CVD method or the like, and then depositing a conductive metal by electrolytic field plating. It can be carried out. Thereby, the penetration electrode 53 without a void can be obtained. The through electrode 53 can also be formed by filling the fine through hole 52 with a conductive paste.

The formation of the electrode 41, the wires 54 and 55, the bonding member 56, and the bonding bump 57 is not particularly limited. For example, a resist pattern is formed on one surface so that the through electrode 53 is exposed, and then the through electrode 53 is formed. It can form by performing the process of forming by electroplating as an electric power feeding layer by the front and back.
Next, the joining member 56 is joined to the joining member 30 of the multi-axis motion sensor semi-finished product 2 ′, and the wiring 54 is joined to the contact electrode 29 of the sensor main body 11, so The multi-axis motion sensor semi-finished product 2 ′ is joined to produce the multi-axis motion sensor 2 (FIG. 15A). The joining of the multi-axis motion sensor semi-finished product 2 'and the interposer 3 and the joining of the wiring 54 and the contact electrode 29 via the annular joining member 5 formed by joining the joining member 56 and the joining member 30 are performed. The metal bonding method as described with reference to FIG. 9 or the paste bump bonding method as described with reference to FIG. 10 can be used.

  Further, in the manufacturing method of the sensor unit of the present invention, the active element built-in module 4 is produced by multi-face mounting as with the multi-axis motion sensor semi-finished product 2 ′ and the interposer 3 (FIG. 15B). That is, the active element built-in module wafer 4 ′ is divided into multiple impositions (each imposition portion is indicated by 1 A), and for each imposition 1 A, an active element 65 is embedded in a region outside the portion to be embedded in a later process. A plurality of fine through holes 62 are formed, and a conductive material is disposed in these fine through holes 62 to form through electrodes 63. A wiring 64 connected to the through electrode 63 is formed on the surface opposite to the surface where the active element 65 is embedded. The formation of the fine through hole 62, the through electrode 63, and the wiring 64 can be the same as the formation of the fine through hole 52, the through electrode 53, and the wirings 54 and 55 described above.

  Next, a recess for embedding the active element 65 is formed for each imposition 1A, and the active element 65 is embedded in the recess. The concave portion can be formed by, for example, an ICP-RIE method on the exposed active element built-in module wafer 4 ′ by forming a mask pattern on the active element built-in module wafer 4 ′. It can also be formed by sandblasting, wet etching, or the like. The shape and size of the recess can be appropriately set according to the shape and size of the active element to be embedded. The embedding of the active element 65 is not particularly limited, for example, a method of fixing using an adhesive or a method of fitting the active element into the recess. Thereafter, wiring (not shown) and solder bumps 66 as external electrodes are formed on the surface where the active element 65 is embedded. The wiring and the solder bump 66 may be formed after the bonding between the interposer 3 and the active element built-in module 4 via the bonding bump 57 described later is completed.

Next, the bonding bump 57 of the interposer 3 is bonded to the wiring 64 of the above-described active element built-in module 4, thereby bonding the multi-sided interposer 3 and the multi-sided active element built-in module 4 (FIG. 15C). . Thereby, the multi-sided sensor unit 1 is obtained. The interposer 3 and the active element built-in module 4 can be bonded via the bonding bump 57 by the paste bump bonding method as described with reference to FIG. Further, the interposer 3 and the active element built-in module 4 can be joined by a metal joining method as described above with reference to FIG.
Next, the sensor unit 1 as shown in FIG. 1 is obtained by dicing the multi-sided sensor unit 1.

(Second Embodiment)
Next, another embodiment of the sensor unit manufacturing method of the present invention will be described with reference to FIG. 18 by taking the sensor unit 1 including the interposer 3 shown in FIG. 8 as an example.
Similar to the above-described embodiment, a multi-axis motion sensor semi-finished product 2 ′ is manufactured by multiple imposition (see FIGS. 16 and 17).
In addition, the interposer 3 is manufactured by multiple imposition as follows. That is, an interposer wafer 3 ′ composed of a base 51 having an electrical insulating layer 58 on one side is partitioned into multiple faces (each imposition portion is indicated by 1 A), and an electric insulation layer is provided for each imposition 1 A. An electrode 41 (cross-shaped center electrode 42 and four peripheral electrodes 43 shown in FIG. 7), a wiring 54, and an annular bonding member 56 are formed on 58 (FIG. 18 ( A)). For example, when the base material 51 is silicon, the electrical insulating layer 58 can be made of silicon oxide.

  Next, the bonding member 56 is bonded to the bonding member 30 of the multi-axis motion sensor semi-finished product 2 ′, and the wiring 54 is bonded to the contact electrode 29 of the sensor main body 11, whereby the multi-faceted interposer wafer 3 ′. And the multi-axis multi-axis motion sensor semi-finished product 2 ′ are joined together to produce the multi-axis motion sensor 2 (FIG. 18B). The multi-axis motion sensor semi-finished product 2 ′ and the interposer wafer 3 ′ are joined via the annular joining member 5 formed by joining the joining member 56 and the joining member 30, and the wiring 54 and the contact electrode 29. This bonding can be performed by the metal bonding method described with reference to FIG. 9 or the paste bump bonding method described with reference to FIG.

Next, a recess 52 'is formed so that the electrically insulating layer 58 is exposed from the opposite surface of the multi-sided interposer wafer 3' (the surface not joined to the multi-sided multi-axis motion sensor semi-finished product 2 '). Thereafter, an electrical insulating layer 58 is formed on the substrate 51 including the recess 52 '(FIG. 18C). The recess 52 ′ is a desired portion where the wiring 54 exists via the electrical insulating layer 58. The formation of the recess 52 ′ can be performed by, for example, a sand blast method, a wet etching method, or a femtosecond laser method. Before forming the recess 52 ', the interposer wafer 3' having multiple faces may be polished so as to have a desired thickness.
Next, a fine hole is formed in the electrical insulating layer 58 exposed at the bottom of the recess 52 'to expose the wiring 54 in the recess 52'. Thereby, a fine through hole 52 is formed, a conductive material is disposed in the fine through hole 52 to form a through electrode 53, and a wiring 55 and a bonding bump 57 are formed (FIG. 18D). Thereby, the interposer 3 is produced by multiple imposition. The fine holes can be formed by, for example, an ICP-RIE method through a mask pattern.

Further, in the method for manufacturing a sensor unit according to the present invention, the active element built-in module 4 is manufactured with multiple attachments in the same manner as in the above-described embodiment (see FIG. 15B).
Subsequently, the bonding bump 57 of the interposer 3 is bonded to the wiring 64 of the active element built-in module 4, thereby bonding the multi-sided interposer 3 and the multi-sided active element built-in module 4 to join the multi-sided sensor unit 1. (Not shown in FIG. 18) is obtained. The interposer 3 and the active element built-in module 4 can be bonded via the bonding bump 57 by the paste bump bonding method as described with reference to FIG. Further, the interposer 3 and the active element built-in module 4 can be joined by a metal joining method as described above with reference to FIG.
Next, the sensor unit 1 having the interposer 3 as shown in FIG. 8 is obtained by dicing the multi-sided sensor unit 1.

  Since the sensor unit manufacturing method of the present invention as described above can perform batch assembly for joining the multi-axis motion sensor semi-finished product, the interposer, and the active element built-in module at the wafer level, the process management is easy and the manufacturing cost is low. It can be reduced, and since the bonding is performed using a metal bonding method or paste bump bonding method, the influence of heat on the multi-axis motion sensor can be prevented, and a highly reliable sensor unit Manufacture is possible.

(Third embodiment)
Next, another embodiment of the sensor unit manufacturing method of the present invention will be described by taking the sensor unit 71 shown in FIG. 11 as an example.
FIG. 19 is a process diagram showing another embodiment of a method for producing a sensor unit of the present invention. First, in the same manner as in the above-described embodiment, a multi-axis motion sensor semi-finished product 2 ′ is produced by multi-face imposition (each imposition portion is indicated by 71A) (FIG. 19A).

  Further, in the present invention, the active element built-in module 74 is manufactured with multiple faces (FIG. 19B). That is, the active element built-in module wafer 74 ′ is divided into multiple impositions (each imposition portion is indicated by 71 A), and for each imposition 71 A, the active element 95 is embedded in a region outside the portion to be embedded in a later process. A plurality of fine through holes 92 are formed, and a conductive material is disposed in these fine through holes 92 to form through electrodes 93. Further, on the surface opposite to the surface where the active element 95 is embedded, an electrode 81 constituting the multi-axis motion sensor 2 (like the electrode 41 shown in FIG. 7), a cross-shaped center electrode 82 and four surrounding electrodes are provided. 83, the wiring 94 and the annular joining member 97 are formed. The formation of the fine through hole 92, the through electrode 93, the wiring 94, the annular bonding member 97, and the electrode 81 is the same as the formation of the fine through hole 52, the through electrode 53, the wirings 54 and 55, and the electrode 41 in the above-described embodiment. can do. The embedding of the active element 95 can be the same as the embedding of the active element 65 in the above-described embodiment.

Next, the joining member 97 is joined to the joining member 30 of the multi-faceted multi-axis motion sensor semi-finished product 2 ′, and the wiring 94 is joined to the contact electrode 29 of the sensor body 11, so The multi-axis motion sensor 2 is manufactured by joining 74 and the multi-axis multi-axis motion sensor semi-finished product 2 '. Thereby, the multi-sided sensor unit 71 is obtained (FIG. 19C). The joining of the multi-axis motion sensor semi-finished product 2 'and the active element built-in module 74 via the annular joining member 5' formed by joining the joining member 97 and the joining member 30, and the wiring 94 and the contact electrode The bonding 29 can be performed by the metal bonding method described with reference to FIG. 9 or the paste bump bonding method described with reference to FIG.
Next, the sensor unit 71 as shown in FIG. 11 is obtained by dicing the multi-sided sensor unit 71.

(Fourth embodiment)
Next, another embodiment of the sensor unit manufacturing method of the present invention will be described with reference to FIGS. 20 and 21 by taking the sensor unit 71 including the active element built-in module 74 shown in FIG. 13 as an example. .
Similar to the above-described embodiment, a multi-axis motion sensor semi-finished product 2 ′ is manufactured by multiple imposition (see FIGS. 16 and 17).
In addition, the active element built-in module 74 is manufactured in multiple ways as follows. That is, an active element built-in module wafer 74 ′ made of a base material 91 provided with an electrical insulating layer 98 on one surface is partitioned into multiple surfaces (each surface portion is indicated by 71A), and each surface surface 71A has An electrode 81 (consisting of a cross-shaped center electrode 82 and four surrounding electrodes 83 as in the case of the electrode 41 shown in FIG. 7), a wiring 94, and an annular shape on the electrical insulating layer 98. The joining member 97 is formed (FIG. 20A). For example, when the substrate 91 is silicon, the electrical insulating layer 98 can be made of silicon oxide.

  Next, the joining member 97 is joined to the joining member 30 of the multi-axis motion sensor semi-finished product 2 ′, and the wiring 94 is joined to the contact electrode 29 of the sensor body 11. The multi-axis motion sensor 2 is manufactured by bonding the wafer 74 ′ and the multi-axis multi-axis motion sensor semi-finished product 2 ′ (FIG. 20B). The joining of the multi-axis motion sensor semi-finished product 2 'and the active element built-in module wafer 74' through the annular joining member 5 'formed by joining the joining member 97 and the joining member 30, and the wiring 94 The contact electrode 29 can be bonded by the metal bonding method described with reference to FIG. 9 or the paste bump bonding method described with reference to FIG.

Next, a recess 92 ′ is formed so that the electrically insulating layer 98 is exposed from the opposite surface (the surface not joined to the multi-surface multi-axis motion sensor semi-finished product 2 ′) of the multi-surface active module built-in wafer 74 ′. After that, an electrical insulating layer 98 is formed on the substrate 91 including the recess 92 '(FIG. 20C). The recess 92 ′ is a desired portion where the wiring 94 is present via the electrical insulating layer 98. The concave portion 92 'can be formed by, for example, a sand blast method, a wet etching method, or a femtosecond laser method. Note that before forming the recess 92 ′, the multi-sided active element built-in module wafer 74 ′ may be polished so as to have a desired thickness.
Next, a fine hole is formed in the electrical insulating layer 98 exposed at the bottom of the recess 92 'to expose the wiring 94 in the recess 92'. Thereby, a fine through hole 92 is formed, and a conductive material is provided in the fine through hole 92 to form a through electrode 93 (FIG. 21A). The fine holes can be formed by, for example, an ICP-RIE method through a mask pattern.

Next, an active element 95 is embedded for each imposition 71A, and then a wiring (not shown) and solder bumps 96 as external electrodes are formed on the surface where the active element 95 is embedded (FIG. 21B). . As a result, the active element built-in module 74 is manufactured by multiple imposition, and the multiple imposition sensor unit 71 is obtained. The embedding of the active element 95 can be the same as the embedding of the active element 65 in the above-described embodiment.
Next, the multi-sided sensor unit 71 is diced to obtain the sensor unit 71 including the active element built-in module 74 as shown in FIG.
Since the sensor unit manufacturing method of the present invention as described above can perform batch assembly that joins the multi-axis motion sensor semi-finished product and the active element built-in module at the wafer level, the process management is easy and the manufacturing cost is reduced. In addition, since the bonding is performed using a metal bonding method or a paste bump bonding method, the influence of heat on the multi-axis motion sensor can be prevented, and a highly reliable sensor unit can be manufactured. Is possible.
In addition, the manufacturing method of the above-mentioned sensor unit is an illustration, and this invention is not limited to these embodiment.

  The present invention can be applied in various fields where a small and highly reliable sensor unit is required.

It is a schematic sectional drawing which shows one Embodiment of the sensor unit of this invention. It is an enlarged view which shows the state which spaced apart the sensor main body, glass substrate, and interposer which comprise the multi-axis motion sensor shown by FIG. It is a top view from the silicon layer (active layer silicon) side of the sensor main body shown by FIG. FIG. 3 is a plan view from the silicon layer (substrate silicon) side of the sensor body shown in FIG. 2. It is a longitudinal cross-sectional view in the II-II line in the sensor main body shown by FIG. It is a top view by the side of the electrode arrangement | positioning surface of a glass substrate. It is a top view by the side of the electrode arrangement | positioning surface of an interposer. It is drawing which shows the other aspect of the interposer which comprises the sensor unit of this invention. It is a partial expanded sectional view for demonstrating an example of joining of a multi-axis motion sensor and an interposer via a joining member. It is a partial expanded sectional view for demonstrating the other example of joining of the multi-axis motion sensor and interposer via a joining member. It is a schematic sectional drawing which shows other embodiment of the sensor unit of this invention. FIG. 12 is a partially enlarged cross-sectional view for explaining an example of joining of the multi-axis motion sensor of the sensor unit shown in FIG. 11 and the active element built-in module. It is drawing which shows the other aspect of the active element built-in module which comprises the sensor unit of this invention. It is process drawing which shows one Embodiment of the manufacturing method of the sensor unit of this invention. It is process drawing which shows one Embodiment of the manufacturing method of the sensor unit of this invention. It is process drawing which shows the manufacture example of the multi-axis motion sensor semi-finished product in the manufacturing method of the sensor unit of this invention. It is process drawing which shows the manufacture example of the multi-axis motion sensor semi-finished product in the manufacturing method of the sensor unit of this invention. It is process drawing which shows other embodiment of the manufacturing method of the sensor unit of this invention. It is process drawing which shows other embodiment of the manufacturing method of the sensor unit of this invention. It is process drawing which shows other embodiment of the manufacturing method of the sensor unit of this invention. It is process drawing which shows other embodiment of the manufacturing method of the sensor unit of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,71 ... Sensor unit 2 ... Multi-axis motion sensor 3 ... Interposer 4, 74 ... Active element built-in module 5, 5 '... Joining member 11 ... Sensor main body 12 ... Glass substrate 15 ... SOI substrate 21 ... Frame member 22 ... Beam 23 ... weights 25, 27 ... electrodes 29 ... contact electrodes 30 ... joining members 31, 41 ... electrodes 52, 62, 92 ... fine through holes 53, 63, 93 ... through electrodes 54, 55 ... wirings 56, 97 ... joining members 64, 94 ... Wiring 65, 95 ... Active element 12 '... Glass wafer 15' ... SOI wafer

Claims (10)

A multi-axis motion sensor, an interposer having a through electrode, and a module with a built-in active element are provided in a multistage state in this order.
The multi-axis motion sensor is a sensor body made of an SOI substrate having a three-layer structure of silicon layer / silicon oxide layer / silicon layer, and is disposed on both sides of a weight supported via a beam. A sensor body having a contact electrode disposed in a region outside the weight, and a glass having a predetermined electrode disposed on a surface of the sensor body opposite to the surface facing the interposer. A substrate and a predetermined electrode disposed on the interposer so as to face the sensor body;
The interposer includes a substrate having a through electrode, the electrode disposed on the substrate so as to face the sensor main body, and wiring disposed on both surfaces of the substrate, the outer side being outside the wiring In this region, the weight is hermetically sealed by being joined to the sensor body via an annular joining member, and the wiring on the multi-axis motion sensor side is joined to the contact electrode of the sensor body,
The module with a built-in active element includes a substrate, an active element embedded in the substrate, and a plurality of through electrodes that are located in a region outside the active element and penetrate the substrate. A sensor unit comprising a wiring for connecting the active element, wherein the through electrode is joined to the wiring of the interposer.   The joining member includes a metal layer of any one of an Al / Cr laminate, an Al / Ti laminate, and an Al / Au laminate, an Al / Au laminate, an Al / Sn—Au alloy laminate, and an Al / Sn—Ag alloy. The sensor unit according to claim 1, wherein any one of the laminated metal layers is bonded.   The bonding member includes a bonding bump and a metal layer sandwiching the bonding bump, and the bonding bump includes conductive powder of any one of Au, Ag, Cu, Sn, or an alloy thereof and a resin component. The sensor unit according to claim 1, wherein the sensor unit is made of a conductive material of any one of Au, Ag, Cu, and Sn. An active element built-in module, and a multi-axis motion sensor bonded on the active element built-in module,
The multi-axis motion sensor is a sensor body made of an SOI substrate having a three-layer structure of silicon layer / silicon oxide layer / silicon layer, and is disposed on both sides of a weight supported via a beam. A sensor body having a contact electrode disposed in a region outside the weight, and a predetermined electrode disposed on a surface of the sensor body opposite to the surface facing the active element built-in module. A glass substrate having a predetermined electrode disposed on the active element built-in module so as to face the sensor body,
The active element built-in module includes a substrate, the electrode disposed on the substrate so as to face the sensor body, the active device built in the substrate, and an area outside the active device. And a plurality of through electrodes penetrating the substrate, and a wiring for connecting the through electrodes and the active element, and an annular bonding member to the sensor body in a region outside the wiring The sensor unit, wherein the weight is hermetically sealed, and the through electrode is joined to a contact electrode of the sensor body.   The joining member includes a metal layer of any one of an Al / Cr laminate, an Al / Ti laminate, and an Al / Au laminate, an Al / Au laminate, an Al / Sn—Au alloy laminate, and an Al / Sn—Ag alloy. 5. The sensor unit according to claim 4, wherein any one of the laminated metal layers is bonded.   The bonding member includes a bonding bump and a metal layer sandwiching the bonding bump, and the bonding bump includes conductive powder of any one of Au, Ag, Cu, Sn, or an alloy thereof and a resin component. The sensor unit according to claim 4, wherein the sensor unit is made of a conductive material of any one of Au, Ag, Cu, and Sn. An SOI wafer having a three-layer structure of silicon layer / silicon oxide layer / silicon layer and one glass wafer are partitioned into multiple faces, and desired processing is performed for each facet, and the SOI wafer is obtained. A multi-axis motion sensor semi-finished product with a laminated structure in which a glass substrate formed on a glass wafer is bonded to one side of the sensor body formed in the step,
The interposer wafer is partitioned into multiple faces, a plurality of fine through holes are formed for each face, a conductive material is disposed in the fine through holes to form through electrodes, and desired wiring connected to the through electrodes, Forming electrodes for multi-axis motion sensors and producing interposers with multiple faces;
The active element built-in module wafer is divided into multiple faces, each face is built with an active element, a plurality of fine through holes are formed in the area outside the active element, and a conductive material is disposed in the fine through holes. Forming a through-electrode, forming a wiring for connecting the through-electrode and the active element, and producing a multi-sided active element module;
For each imposition, the interposer is joined to the multi-axis motion sensor semi-finished product in a ring shape by a metal joining method or a paste bump joining method so that a multi-axis motion sensor electrode faces the sensor body, and at the same time, the interposer A multi-axis motion sensor is completed by joining the wiring of the sensor and the desired part of the sensor body, and joining the wiring of the other surface of the interposer and the through electrode of the module with a built-in active element. A unit process;
And a step of dicing the multi-sided sensor unit. An SOI wafer having a three-layer structure of silicon layer / silicon oxide layer / silicon layer and one glass wafer are partitioned into multiple faces, and desired processing is performed for each facet, and the SOI wafer is obtained. A multi-axis motion sensor semi-finished product with a laminated structure in which a glass substrate formed on a glass wafer is bonded to one side of the sensor body formed in the step,
The interposer wafer is divided into multiple impositions, and electrodes for the multi-axis motion sensor and desired wiring are formed for each imposition, and then the electrodes for the multi-axis motion sensor are formed in the sensor body for each imposition. The interposer wafer is annularly bonded to the multi-axis motion sensor semi-finished product by a metal bonding method or a paste bump bonding method so as to face each other, and at the same time, the wiring of the interposer wafer and a desired portion of the sensor body are bonded together. A multi-axis motion sensor is completed, and then a plurality of fine through holes are formed on the interposer wafer so that the wiring is exposed from the opposite surface, and a conductive material is disposed in the fine through holes to form through electrodes, Forming a desired wiring connected to the through electrode and producing an interposer with multiple faces;
The active element built-in module wafer is divided into multiple faces, each face is built with an active element, a plurality of fine through holes are formed in the area outside the active element, and a conductive material is disposed in the fine through holes. Forming a through-electrode, forming a wiring for connecting the through-electrode and the active element, and producing a multi-sided active element module;
For each imposition, the step of joining the interposer wiring and the through electrode of the active element built-in module to form a multi-imposition sensor unit;
And a step of dicing the multi-sided sensor unit. An SOI wafer having a three-layer structure of silicon layer / silicon oxide layer / silicon layer and one glass wafer are partitioned into multiple faces, and desired processing is performed for each facet, and the SOI wafer is obtained. A multi-axis motion sensor semi-finished product with a laminated structure in which a glass substrate formed on a glass wafer is bonded to one side of the sensor body formed in the step,
The active element built-in module wafer is divided into multiple faces, each face is built with an active element, a plurality of fine through holes are formed in the area outside the active element, and a conductive material is disposed in the fine through holes. Forming a through-electrode, wiring for connecting the through-electrode and the active element, forming an electrode for a multi-axis motion sensor to produce an active element built-in module with multiple faces;
For each imposition, the active element built-in module is joined to the multi-axis motion sensor semi-finished product annularly by a metal joining method or a paste bump joining method so that the electrode for the multi-axis motion sensor faces the sensor body, Simultaneously joining a through electrode of the module with a built-in active element and a desired portion of the sensor body to complete a multi-axis motion sensor, thereby forming a multi-sided sensor unit;
And a step of dicing the multi-sided sensor unit. An SOI wafer having a three-layer structure of silicon layer / silicon oxide layer / silicon layer and one glass wafer are partitioned into multiple faces, and desired processing is performed for each facet, and the SOI wafer is obtained. A multi-axis motion sensor semi-finished product with a laminated structure in which a glass substrate formed on a glass wafer is bonded to one side of the sensor body formed in the step,
The active element built-in module wafer is divided into multiple impositions, the electrodes for the multi-axis motion sensor and the desired wiring are formed for each imposition, and then the electrodes for the multi-axis motion sensor are provided for each imposition. The active element built-in module wafer is annularly bonded to the multi-axis motion sensor semi-finished product by a metal bonding method or a paste bump bonding method so as to face the sensor body, and simultaneously the active element built-in module wafer wiring and the sensor A multi-axis motion sensor is completed by joining to a desired part of the main body, and then an active element is embedded for each imposition, and the active element built-in module wafer is opposed to a region outside the active element. A plurality of fine through holes are formed so that the wiring is exposed from the surface, and a conductive material is disposed in the fine through holes to form a through electrode, the through electrode To prepare a active device built-in module with multi with forming a wiring for connecting the active element, a step of the multi with the sensor unit,
And a step of dicing the multi-sided sensor unit.

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