WO2009151047A1 - マグネトインピーダンスセンサ素子 - Google Patents
マグネトインピーダンスセンサ素子 Download PDFInfo
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- WO2009151047A1 WO2009151047A1 PCT/JP2009/060517 JP2009060517W WO2009151047A1 WO 2009151047 A1 WO2009151047 A1 WO 2009151047A1 JP 2009060517 W JP2009060517 W JP 2009060517W WO 2009151047 A1 WO2009151047 A1 WO 2009151047A1
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- wire
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- magnetic amorphous
- amorphous wire
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/063—Magneto-impedance sensors; Nanocristallin sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/18—Measuring magnetostrictive properties
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N50/00—Galvanomagnetic devices
Definitions
- the present invention relates to a magneto-impedance sensor element using a magnetic amorphous wire whose characteristics change according to an external magnetic field.
- MI sensor element As a sensor element used for a magnetic orientation sensor or the like, a magneto-impedance sensor element using a magnetic amorphous wire whose characteristics change according to an external magnetic field (hereinafter referred to as “MI sensor element” as appropriate) has been developed (Patent Literature). 1).
- MI sensor element includes a base made of a non-magnetic material, a magnetic amorphous wire held on the base, a coating insulator formed so that the magnetic amorphous wire penetrates the inside, and a periphery of the coating insulator And a detection coil formed on the substrate. Since the MI sensor element having such a configuration is mounted on, for example, a portable terminal device such as a mobile phone, the MI sensor element is required to be downsized along with a request for downsizing and thinning of the device.
- the length of the magnetic amorphous wire is required. That is, as the length of the magnetic amorphous wire is longer, the demagnetizing field generated inside becomes smaller and the influence of the demagnetizing field can be suppressed, so that the output of the MI sensor element can be easily increased. Further, the longer the magnetic amorphous wire is, the more the number of turns of the detection coil formed around the insulating insulator can be increased, so that the output of the MI sensor element can be increased.
- the longitudinal direction of the magnetic amorphous wire is set to the normal direction (Z-axis direction) of the main surface of the IC chip and the IC substrate. If the length of the magnetic amorphous wire is increased, the MI sensor element is increased in the thickness direction of the IC chip. Therefore, there is a problem that it is difficult to reduce the thickness of the device when the IC chip on which the MI sensor element is mounted is built in a portable terminal device or the like.
- the length of the magnetic amorphous wire and the length of the entire MI sensor element in the longitudinal direction are as equal as possible.
- the electrode terminals and the like are basically not formed on the cut surface. Forming a pattern on the cut surface is because pattern formation is individually performed on each MI sensor element after cutting, which is not practical from the viewpoint of productivity. If a pattern is individually formed on each MI sensor element, the productivity is significantly reduced as compared with the case where the pattern is formed on the substrate wafer.
- an electrode terminal electrically connected to the magnetic amorphous wire and the detection coil is formed on the upper surface of the base body, which is a cut surface.
- the portion where the electrode terminal is formed is a step portion that is lowered by one step from the upper surface of the substrate (see the comparative example described later). Since this step is a part other than the main part of the invention in the patent document, it is only omitted in the drawing.
- the groove processing step is required, which increases the manufacturing cost and makes it difficult to improve the productivity.
- the thickness is increased in order to ensure the strength of the substrate, and it is difficult to reduce the size of the MI sensor element.
- a material having a relatively low strength is used for the substrate in order to facilitate the cutting process. Accordingly, it is necessary to further increase the thickness of the base, and it becomes more difficult to reduce the size of the MI sensor element.
- the magnetic sensing direction of the MI sensor element is a direction orthogonal to the IC chip (Z In the case of (axial direction), no electrode terminal is provided on the surface. This is because these electrode terminals need to be subjected to processing such as wire bonding with the electrode terminals on the IC chip, so that the surface on which the IC chip and the electrode terminals are formed is basically Must be parallel.
- the present invention has been made in view of such conventional problems, and an object of the present invention is to provide a magneto-impedance sensor element that has high sensitivity and can be miniaturized.
- the present invention comprises a substrate made of a non-magnetic material, A magnetic amorphous wire held on the substrate; A coated insulator formed so that the magnetic amorphous wire penetrates the inside; A detection coil formed around the covering insulator; A terminal block made of an insulator having a terminal mounting surface rising from the surface of the base on which the magnetic amorphous wire is disposed; An electrode terminal for a wire and an electrode terminal for a coil formed on the terminal mounting surface; A wire connection wiring for electrically connecting the wire electrode terminal and a pair of wire conduction terminals provided on the magnetic amorphous wire; A coil connection wiring for electrically connecting the coil electrode terminal and a pair of coil energization ends provided in the detection coil; The terminal mounting surface has a normal component having a longitudinal component of the magnetic amorphous wire, and is disposed between both ends of the magnetic amorphous wire in the longitudinal direction of the magnetic amorphous wire. There is a magneto-impedance sensor element.
- the magneto-impedance sensor element includes the terminal block having the terminal mounting surface.
- the terminal mounting surface is disposed between both ends of the magnetic amorphous wire in the longitudinal direction of the magnetic amorphous wire.
- the electrode terminal for the wire and the electrode terminal for the coil can be easily formed on the terminal mounting surface of the terminal block, and the magnetic amorphous wire is arranged over the entire base in the longitudinal direction of the magnetic amorphous wire. can do.
- the magnetic amorphous wire can be lengthened without increasing the size of the substrate, and the sensitivity can be increased without increasing the size of the MI sensor element.
- an MI sensor element in manufacturing an MI sensor element, generally, after forming a magnetic amorphous wire, a detection coil, etc. on a base wafer which is a base material of a base of a large number of MI sensor elements, this is used. Cut to obtain individual MI sensor elements. At this time, if the MI sensor element has the terminal block, the wire electrode terminal and the coil electrode terminal can be easily formed in a state before being cut into individual MI sensor elements.
- the MI sensor element since the MI sensor element has the terminal block, it is not necessary to form the above-described groove (step) on the base wafer. Therefore, there is no problem that the length of the magnetic amorphous wire has to be shortened by the amount of the stepped portion, and the length of the magnetic amorphous wire is shortened with respect to the size of the base. There is nothing. Therefore, it is possible to make the length of the magnetic amorphous wire equal to the entire length of the MI sensor element, and it is possible to achieve both miniaturization and high sensitivity of the MI sensor element.
- the groove processing step as described above is not necessary, the manufacturing cost can be reduced and the productivity can be improved.
- it is not necessary to form a groove it is not necessary to increase the thickness of the substrate, and the MI sensor element can be easily downsized.
- it is not necessary to take into account the ease of cutting it is possible to use a material with high strength for the base, and accordingly, the thickness of the base can be further reduced, further reducing the size of the MI sensor element. It becomes easy.
- FIG. 1 is a front view of an MI sensor element in Embodiment 1.
- FIG. FIG. 2 is a cross-sectional view of an MI sensor element corresponding to a cross section taken along line AA in FIG. 1 in a state in which a bonding wire is connected in the first embodiment.
- FIG. 3 is a cross-sectional view taken along line BB in FIG. 1.
- 1 is a perspective view of a magnetic orientation sensor using an MI sensor element in Embodiment 1.
- FIG. 1 is a plan view of a base wafer in Example 1.
- FIG. 2 is a partially enlarged plan view of a base wafer in Example 1.
- FIG. FIG. 2 is a conceptual explanatory diagram of an electronic circuit in the first embodiment.
- FIG. 3 is a diagram showing a measurement result of an output voltage in Example 1.
- FIG. 10 is a cross-sectional view taken along line CC in FIG. 9.
- FIG. 12 is a cross-sectional view of an MI sensor element corresponding to a cross section taken along line DD in FIG. 11 in a state where bonding wires are connected in a comparative example.
- FIG. 12 is a cross-sectional view taken along line EE in FIG. 11. Sectional explanatory drawing of the cutting method of a base wafer in a comparative example.
- the said terminal mounting surface is formed so that the normal line may become the longitudinal direction of the said magnetic amorphous wire.
- the magnetic amorphous wire is arranged so as to be orthogonal to the main surface of the IC chip, the wire electrode terminal and the coil electrode terminal are arranged on the main surface of the IC chip. And can be parallel. As a result, electrical connection such as wire bonding between the wire electrode terminal and the coil electrode terminal and the IC chip can be easily performed.
- the terminal block is preferably formed in a region other than the formation region of the magnetic amorphous wire, the covering insulator, and the detection coil. In this case, since the terminal block does not cover the magnetic amorphous wire, the covering insulator, and the detection coil, stress applied to the magnetic amorphous wire, dew condensation on the magnetic amorphous wire, etc. can be prevented and accurate magnetic field detection can be performed. Can be secured.
- the magnetic amorphous wire may be stressed, and the parasitic capacitance changes due to condensation of air existing between the magnetic amorphous wire and the terminal block. May occur. Due to this change in stress and parasitic capacitance, the current supplied to the magnetic amorphous wire fluctuates, and variations in the magnetic sensitivity (output / applied magnetic field) of the MI sensor element (for example, about the magnetic sensitivity). 10% variation) may occur. Therefore, such a problem can be avoided by providing the terminal block so as not to cover the magnetic amorphous wire. That is, variations in the magnetic sensitivity of the MI sensor element can be almost eliminated (for example, a variation of less than 1% with respect to the magnetic sensitivity).
- the wire terminal and the terminal of the electronic circuit formed on the main surface of the IC chip Connection is difficult. Therefore, it is not desirable to provide the wire electrode terminal and the coil electrode terminal on the surface of the substrate on which the magnetic amorphous wire is formed, and for the wire on the surface having an angle with respect to the surface, more preferably the surface orthogonal to the surface.
- An electrode terminal and a coil electrode terminal are formed. Therefore, by applying the present invention to such an MI sensor element, the function and effect can be sufficiently exhibited.
- the mounting of the MI sensor element on the IC chip means that the MI sensor element is directly electrically connected to the IC chip by wire bonding or the like, for example, via an IC substrate on which the IC chip is mounted. It also includes indirectly connecting the MI sensor elements.
- it may be an element for mounting on an IC substrate on which an IC chip formed with an electronic circuit is mounted so that the longitudinal direction of the magnetic amorphous wire is oriented in the normal direction of the main surface of the IC substrate.
- the MI sensor element When the MI sensor element is indirectly electrically connected via an IC substrate on which an IC chip is mounted, the longitudinal direction of the magnetic amorphous wire is oriented in the normal direction of the main surface of the IC substrate as described above.
- the magneto-impedance sensor element (MI sensor element) 1 of this example includes a base 2 made of a non-magnetic material, a magnetic amorphous wire 3 held on the base 2, and the magnetic amorphous It has a covering insulator 4 formed so that the wire 3 penetrates the inside, and a detection coil 5 formed around the covering insulator 4.
- a terminal block 6 made of an insulator having a terminal mounting surface 61 rising from the surface 21 is provided on the surface 21 of the base 2 on the side where the magnetic amorphous wire 3 is disposed.
- a pair of wire electrode terminals 11 and a pair of coil electrode terminals 12 are formed on the terminal mounting surface 61.
- one of the pair of wire electrode terminals 11 and one of the pair of coil electrode terminals 12 may share one electrode as a reference potential. In this case, the total number of wire electrode terminals 11 and coil electrode terminals 12 can be three.
- the wire electrode terminal 11 and the pair of wire energization ends 31 provided on the magnetic amorphous wire 3 are electrically connected by a wire connection wiring 110.
- the coil electrode terminal 12 and the pair of coil energization ends 51 provided in the detection coil 5 are electrically connected by a coil connection wiring 120.
- the terminal mounting surface 61 has a normal component in the longitudinal direction of the magnetic amorphous wire 3 and is disposed between both ends 311 and 311 of the magnetic amorphous wire 3 in the longitudinal direction of the magnetic amorphous wire 3.
- the terminal mounting surface 61 is formed so that the normal line thereof is the longitudinal direction of the magnetic amorphous wire 3.
- the terminal block 6 is formed in a region other than the formation region of the magnetic amorphous wire 3, the covering insulator 4, and the detection coil 5. That is, the terminal block 6 is formed on the surface of the base 2 so as to cover a part of the wire connection wiring 110 and the coil connection wiring 120, but the magnetic amorphous wire 3, the covering insulator 4, and the detection coil 5 is formed at a position away from these formation regions so as not to cover 5.
- the longitudinal direction of the magnetic amorphous wire 3 faces the IC chip 7 formed with an electronic circuit in the normal direction of the main surface 71 of the IC chip 7. It is an element for mounting on.
- a direction that is perpendicular to the main surface 71 of the IC chip 7 when mounted on the IC chip 7 is referred to as a Z-axis direction. That is, the direction that coincides with the longitudinal direction of the magnetic amorphous wire 3 is the Z-axis direction.
- the substrate 2 for example, insulating alumina ceramics, semiconductor silicon wafers, conductor metals, etc. can be used, and the thickness in the direction perpendicular to the surface 21 is, for example, 0.1 mm to 0.5 mm. Can do. In this example, the thickness is 0.3 mm.
- the height of the base 2 in the Z-axis direction was 0.6 mm.
- the magnetic amorphous wire 3 is made of a zero-magnetostrictive amorphous CoFeSiB alloy, and can have a diameter of 20 ⁇ m or less, for example. Here, the diameter was 10 ⁇ m.
- this magnetic amorphous wire 3 is arrange
- the length of the magnetic amorphous wire 3 is 0.6 mm.
- Wire energization ends 31 at both ends of the magnetic amorphous wire 3 are electrically connected to energization pads 310 formed on the surface 21 of the base 2. Further, the portion between the pair of energization ends 31 of the magnetic amorphous wire 3 is covered with the covering insulator 4.
- the covering insulator 4 can be configured using, for example, an inorganic insulating material such as aluminum oxide or silicon oxide, or an organic insulating material such as an epoxy resin.
- the detection coil 5 is formed on the outer peripheral surface of the covering insulator 4.
- the detection coil 5 has an outer periphery of the covering insulator 4 by appropriately connecting a flat pattern 501 formed on the surface 21 of the base 2 and a three-dimensional pattern 502 formed on the outer surface of the covering insulator 4. Are arranged so as to be spirally wound. Both ends of the winding pattern of the detection coil 5 are coil energization ends 51. Here, the number of turns of the detection coil 5 is 15 turns.
- the magnetic amorphous wire 3, the covering insulator 4, and the detection coil 5 are arranged so as to rise from the surface 21 of the base 2, but as disclosed in FIG.
- a groove may be formed in the substrate, and a magnetic amorphous wire, a covering insulator, and a detection coil may be disposed in the groove.
- One end of a coil connection wiring 120 formed on the surface 21 of the base 2 is connected to the pair of coil energization ends 51. Further, one end of a wire connection wiring 110 formed on the surface 21 of the base 2 is connected to the pair of wire energization ends 31 via an energization pad 310. The other end of the wire connection wiring 110 is connected to the wire electrode terminal 11, and the other end of the coil connection wiring 120 is connected to the coil electrode terminal 12.
- the terminal block 6 provided on the surface 21 of the base 2 is made of an insulating material such as epoxy resin or ceramic, and is formed so as to cover the wire connection wiring 110 and the coil connection wiring 120.
- the terminal block 6 is a terminal mounting that is a flat surface orthogonal to the Z axis at a position sufficiently retracted inward (for example, a position retracted 150 to 550 ⁇ m) from one end (upper end 22) of the base 2 in the Z axis direction.
- a surface 61 is provided.
- the terminal mounting surface 61 is retracted from the upper end 22 by 200 ⁇ m.
- the pair of wire electrode terminals 11 and the pair of coil electrode terminals 12 are provided on the terminal mounting surface 61.
- the terminal block 6 includes the formation region of the magnetic amorphous wire 3, the covering insulator 4, and the detection coil 5, and the end surface (upper end) of the base 2 in the direction in which the terminal mounting surface 61 faces from the terminal mounting surface 61. Except for the area up to 22), it is formed on the entire surface 21 of the substrate 2.
- the thickness of the terminal block 6, that is, the width of the terminal mounting surface 61 is, for example, 80 to 150 ⁇ m.
- the width of the terminal mounting surface 61 is 100 ⁇ m.
- the terminal portion 111 on the wire electrode terminal 11 side in the wire connection wiring 110 is formed so as to partially protrude from the terminal mounting surface 61 and is connected to the wire electrode terminal 11.
- the terminal portion 121 on the coil electrode terminal 12 side in the coil connection wiring 120 is also formed so as to partially protrude from the terminal mounting surface 61 and is connected to the coil electrode terminal 12.
- the MI sensor element 1 is mounted on the IC chip 7 for the so-called Z axis, and is arranged so that the longitudinal direction of the magnetic amorphous wire 3 is orthogonal to the main surface 71 of the IC chip 7. Yes.
- the IC chip 7 is mounted on an IC substrate 73 for connecting the mother board and the IC chip 7, and the main surface 731 of the IC substrate 73 and the main surface 71 of the IC chip 7 are parallel to each other.
- the MI sensor element 1 is mounted on the main surface 731 of the IC substrate 73 beside the IC chip 7.
- the wire electrode terminal 11 and the coil electrode terminal 12 in the MI sensor element 1 are respectively formed on predetermined terminals in the electronic circuit formed on the main surface 71 of the IC chip 7 or on the main surface 731 of the IC substrate 73. It is electrically connected by a bonding wire 72 to a predetermined terminal in the electronic circuit. Specifically, both of the coil electrode terminals 12 in the MI sensor element 1 are bonded to the terminals of the IC chip 7, but one of the wire electrode terminals 11 is connected to the terminal of the IC chip 7 and the other. Are connected to the terminals of the IC substrate 73 by bonding. This connection method is an example. For example, all of the wire electrode terminals 11 and the coil electrode terminals 12 in the MI sensor element 1 may be connected to the terminals of the IC chip 7, It may be connected to a terminal.
- the IC chip 7 includes the X-axis MI sensor element 10 and the Y-axis MI sensor element provided with the magnetic amorphous wires 30 parallel to the main surface 71 of the IC chip 7 and perpendicular to each other. 100 is implemented.
- the X-axis MI sensor element 10 and the Y-axis MI sensor element 100 have substantially the same components as the Z-axis MI sensor element 1 of this example, but do not have the terminal block 6 and are wire electrode terminals.
- 11 and the coil electrode terminal 12 are different from the Z-axis MI sensor element 1 in that they are formed on the same surface as the surface on which the magnetic amorphous wire 30 is provided in the substrate 2.
- the three MI sensor elements (1, 10, 100) including the MI sensor element 1 of this example constitute the magnetic direction sensor 70 that detects the three-dimensional direction using the geomagnetism.
- the geomagnetic direction sensor 70 can be mounted on a mobile terminal device such as a mobile phone.
- the Z-axis MI sensor element 1 of this example is combined with the X-axis and Y-axis MI sensor elements 10 and 100 to form a triaxial magnetic direction sensor 70.
- a two-axis magnetic orientation sensor can also be configured by two MI sensor elements including the MI sensor element 1.
- the MI sensor element 1 of the present example is not limited to such a magnetic direction sensor, and can be used for a current sensor, for example. In this case, the sensor can be configured by using only one MI sensor element 1 of this example.
- the magnetic amorphous wire 3, the detection coil 5, and the like are formed on the base wafer 20 that is a base material of the base 2 of many MI sensor elements 1. Do. That is, patterning of a large number of MI sensor elements 1 (for example, a size of 1 mm square or less) is performed at a time on a large substrate wafer 20 of about 10 cm square, for example. At this time, the terminal block 6 is also formed on the surface 21 of the base 2. In forming the terminal block 6, for example, a photosensitive epoxy resin can be used.
- the resin is applied to the entire surface 21 of the substrate 2 and then dried, and then the resin is exposed in a masked state so that only the portion where the terminal block 6 is to be formed is exposed.
- the terminal block 6 having a predetermined size and shape is formed at a predetermined position by developing with a developer.
- the wire electrode terminal 11 and the coil electrode terminal 12 are formed on the terminal mounting surface 61 of the terminal block 6 by using sputtering and plating.
- the forming method other than the terminal block 6, the wire electrode terminal 11 and the coil electrode terminal 12 is omitted, but after forming all the elements of the MI sensor element 1, as shown in FIG.
- Cutting is performed using a dicing saw to obtain individual MI sensor elements 1.
- the cutting surface of the dicing saw 201 (for example, 200 ⁇ m) is taken into consideration so that the cut surface has a desired contour of the MI sensor element 1.
- the magneto-impedance sensor element 1 includes a terminal block 6 having a terminal mounting surface 61, and the terminal mounting surface 61 is disposed between both ends 311 and 311 of the magnetic amorphous wire 3 in the longitudinal direction of the magnetic amorphous wire 3. Yes.
- the wire electrode terminal 11 and the coil electrode terminal 12 can be easily formed on the terminal mounting surface 61 of the terminal block 6, and the magnetic amorphous material is formed over the entire base 2 in the longitudinal direction of the magnetic amorphous wire 3.
- a wire 3 can be provided.
- the magnetic amorphous wire 3 can be lengthened without increasing the size of the substrate 2, and the sensitivity can be increased without increasing the size of the MI sensor element 1.
- the magnetic amorphous wire 3 and the detection coil 5 are formed on the base wafer 20, and then the individual MI sensor elements are cut. Get one. At this time, since the MI sensor element 1 has the terminal block 6, the wire electrode terminals 11 and the coil electrode terminals 12 can be easily formed in a state before being cut into the individual MI sensor elements 1. Can do.
- the MI sensor element 1 since the MI sensor element 1 has the terminal block 6, it is not necessary to form the groove shown in the comparative example (see reference numeral 99 in FIG. 14A) in the base wafer 20. Therefore, it is possible to make the length of the magnetic amorphous wire 3 equal to the entire length of the MI sensor element 1, and it is possible to achieve both miniaturization and high sensitivity of the MI sensor element 1.
- the manufacturing cost can be reduced and the productivity can be improved.
- it is not necessary to form a groove it is not necessary to increase the thickness of the base 2 in particular, and the MI sensor element 1 can be easily downsized.
- a material having high strength can be used for the base 2, and the thickness of the base 2 can be further reduced, and the MI sensor element 1 can be made compact. It becomes easier.
- the terminal block 6 is formed in a region other than the region where the magnetic amorphous wire 3, the covering insulator 4, and the detection coil 5 are formed. Thereby, since the terminal block 6 does not cover the magnetic amorphous wire 3, the covering insulator 4, and the detection coil 5, it is possible to prevent the magnetic amorphous wire 3 from being stressed and to ensure accurate magnetic field detection. .
- the electronic circuit 8 performs signal processing on a pulse oscillation circuit 81 that oscillates a pulse signal to be input to the magnetic amorphous wire 3 of the MI sensor element 1 and a detection voltage generated in the detection coil 5 of the MI sensor element 1.
- a signal processing circuit 82 is generated in the detection coil 5, an analog switch 821 that switches between the detection coil 5 and the output terminal 83, a sample timing adjustment circuit 822 that turns the analog switch 821 on and off in synchronization with the pulse signal, and the detection coil 5.
- an amplifier 823 for amplifying the induced voltage.
- the pulse oscillation circuit 81 generates a pulse signal having a strength of 170 mA mainly including 200 MHz and a signal interval of 1 ⁇ sec, and inputs this pulse signal to the magnetic amorphous wire 3.
- the cut-off time for falling from 90% to 10% of the steady value was 4 nanoseconds.
- the output characteristics of the MI sensor element 1 are evaluated while being rotated 360 ° about the horizontal axis.
- the state in which the longitudinal direction (Z-axis direction) of the magnetic amorphous wire 3 of the MI sensor element 1 is oriented in the vertical direction is defined as a rotation angle of 0 °, and the magnitude of the output signal of the MI sensor element 1 at this time is 0 mV.
- the MI sensor element 1 was rotated 360 ° around the horizontal axis. The change of the output signal at this time is shown in FIG.
- the output signal draws a beautiful sine curve, and it can be seen that the component of geomagnetism in the Z-axis direction is detected accurately.
- the MI sensor element 1 in Example 1 can ensure sufficient detection accuracy even if it is downsized.
- Example 2 In this example, as shown in FIGS. 9 and 10, the size of the terminal block 6 is made smaller than that in the first embodiment. That is, the height of the terminal block 6 in the Z-axis direction is shortened. Specifically, the height of the terminal block 6 in the MI sensor element 1 of this example was 0.13 mm, whereas the height of the terminal block 6 in the MI sensor element 1 of Example 1 was 0.4 mm. Others are the same as in the first embodiment.
- the terminal block 6 if the terminal mounting surface 61 on which the wire electrode terminal 11 and the coil electrode terminal 12 are mounted can be sufficiently secured, the effects of the present invention can be sufficiently obtained. Therefore, it is not always necessary to form a large area on the surface 21 of the base 2 as in the first embodiment. If the adhesion with the base 2 is not impaired, the terminal block 6 has a sufficient area of the terminal mounting surface 61. It is conceivable to take various forms while maintaining the above.
- it may be a terminal block formed by being individually divided so as to correspond to each of the electrode terminal for wire 11 and the electrode terminal for coil 12, or may be a terminal block formed in a step shape Good.
- the sensor element 9 In the MI sensor element 9 of this example, the magnetic amorphous wire 93, the covering insulator 4, the detection coil 5, the wire connection wiring 110, and the coil connection wiring 120 are provided on the surface 921 of the base 92 as in the first and second embodiments. Formed.
- the base 92 has a step 96 at one end in the longitudinal direction (Z-axis direction) of the magnetic amorphous wire 93, and the wire electrode terminal 11 and the coil electrode terminal 12 are provided on a surface orthogonal to the Z-axis direction. It becomes.
- the step portion 96 is formed over the entire Z-axis direction and the thickness direction (the left-right direction in FIG. 11) of the base body 92.
- covering insulator 4, and the detection coil 5 is the same as that of Example 1, Comprising: The magnitude
- Such a step 96 is inevitably required from the viewpoint of manufacture in the so-called Z-axis MI sensor element 9 in which the wire electrode terminal 11 and the coil electrode terminal 12 need to be formed on the surface orthogonal to the magnetic amorphous wire 3. Is formed. That is, in manufacturing the MI sensor element 9, as described above, after patterning a large number of MI sensor elements 9 on the base wafer 920, which is a base material of the base 92 of the large number of MI sensor elements 9, at once. As shown in FIG. 14B, the base wafer 920 is cut by a dicing saw 98 and cut into individual MI sensor elements 9.
- a groove 99 is formed on the surface of the base wafer 920 before being cut along a cutting line to be cut later. That is, in the state of the base wafer 920, as shown in FIG. 14A, for example, a groove 99 having a depth of 200 ⁇ m and a width of 200 ⁇ m is formed. Thereafter, the wire electrode terminal 11 and the coil electrode terminal 12 are patterned on the inner surface 991 of the groove 99 and the surface 921 of the base 92 that is continuous therewith. Then, the cutting by the dicing saw 98 is performed slightly outside the inner surface 991 of the groove 99 (for example, 70 ⁇ m).
- the reason why the base wafer 920 is cut after the groove processing as described above is to maintain the integrity of the base wafer 920 until the formation of the wire electrode terminals 11 and the coil electrode terminals 12 is completed. That is, since the Z-axis MI sensor element 9 as described above needs to form the wire electrode terminal 11 and the coil electrode terminal 12 on the surface orthogonal to the magnetic amorphous wire 93 as described above, A surface orthogonal to the surface 921 of the 92 needs to be formed on the base 92. Therefore, if the groove processing is not performed, the wire electrode terminal 11 and the coil electrode terminal 12 cannot be patterned in the state of the base wafer 920. When the groove processing is not performed, the electrode terminals must be individually formed for each of the separated base bodies 2, and the productivity is remarkably lowered. Therefore, by performing the groove processing, the electrode terminals can be formed while maintaining the integrity of the base wafer 920.
- the step 96 remaining as a part of the groove 99 exists over the entire end of the base 92 in the Z-axis direction, as shown in FIG. It must be shorter than the length.
- the magnetic amorphous wire 93 is made shorter than the base 92 by 70 ⁇ m or more.
- the occupied height of the MI sensor element 9 including the bonding wire 72 in the Z-axis direction is taken into consideration.
- the length L (FIG. 11) of the magnetic amorphous wire 93 is greatly less than the length H (FIG. 12).
- the substrate 92 is grooved, it is necessary to select a material that can be easily processed as the substrate 92. However, since such a material has a low mechanical strength, it is necessary to further increase the thickness of the substrate 92. Arise. As a result, the thickness of the MI sensor element 9 is also increased. Thus, it is difficult to reduce the size of the MI sensor element 9 of this example while increasing the length of the magnetic amorphous wire 3.
- the MI sensor element 1 (Examples 1 and 3) of the present invention has the length of the magnetic amorphous wire 3 in the Z-axis direction of the base 2 as shown in FIGS. Since the length can be increased to the same length, the MI sensor element 1 can be reduced in size while increasing the length of the magnetic amorphous wire 3. Further, since the MI sensor element 1 of the present invention does not require the groove processing as described above, it is not necessary to increase the thickness of the base 2 and further miniaturization is possible.
- the position of the terminal mounting surface 61 in the terminal block 6 can be freely set, the distance between the terminal mounting surface 61 and the upper end of the base 2 in the Z-axis direction can be sufficiently increased.
- the bonding wire 72 is connected to the wire electrode terminal 11 and the coil electrode terminal 12, the upper end of the bonding wire 72 can be prevented from protruding from the upper end of the substrate 2. Therefore, it is possible to prevent the magnetic amorphous wire 3 from being shortened with respect to the occupied height of the MI sensor element 1 including the bonding wire 72.
- the ratio (H / L) between the height H occupied in the Z-axis direction of the MI sensor element including the bonding wire and the length L of the magnetic amorphous wire is used as the miniaturization index ⁇ of the MI sensor element.
- the MI sensor element 1 of Example 1 was compared with the MI sensor element 9 of the comparative example. The smaller the miniaturization index ⁇ (the closer it is to 1), the smaller the miniaturization is achieved.
- the miniaturization index ⁇ of the MI sensor element 9 of the comparative example is calculated.
- the height from the lower end 923 to the step portion 96 of the base 92 of the MI sensor element 9 of the comparative example is 0.6 mm, and the height from the step portion 96 to the upper end 922 is 0.07 mm.
- the MI sensor element 1 has the bonding wire 72 positioned below the upper end 22 of the base 2, so that the occupied height in the Z-axis direction is included even if the bonding wire is included.
- H (FIG. 1) corresponds to the height of the base 2 in the Z-axis direction and is 0.6 mm.
- the magnetic amorphous wire 3 is formed over the full length of the base
- the thickness of the MI sensor element 9 of the comparative example since it is not necessary to consider groove processing, ceramics with high strength are used, and the thickness of the base 2 is 0.3 mm. Even if the thickness (0.1 mm) of the terminal block 6 is added, the thickness of the MI sensor element 1 is 0.4 mm. That is, the thickness of the MI sensor element can also be reduced in the first embodiment compared to the comparative example.
- the difference between Example 1 and the comparative example as described above can be said to be the same between Example 2 and the comparative example.
- the miniaturization index ⁇ of the MI sensor element which is the ratio (H / L) between the height H occupied in the Z-axis direction of the element and the length L of the magnetic amorphous wire, becomes large. That is, in this case, when the length L of the magnetic amorphous wire is 0.60 mm, the occupied height H in the Z-axis direction of the MI sensor element including the bonding wire is as long as 0.75 mm.
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Abstract
Description
かかるMIセンサ素子は、非磁性体からなる基体と、該基体上に保持された磁性アモルファスワイヤと、該磁性アモルファスワイヤが内側を貫通するように形成した被覆絶縁体と、該被覆絶縁体の周囲に形成した検出コイルとを有する。
このような構成のMIセンサ素子は、例えば携帯電話機等の携帯端末機器などに搭載するため、かかる機器の小型化、薄型化の要請に伴い、MIセンサ素子の小型化が要請されている。
すなわち、磁性アモルファスワイヤの長さが長いほど、内部に生じる反磁界が小さくなり、反磁界の影響を抑制することができるため、MIセンサ素子の出力を大きくしやすい。また、磁性アモルファスワイヤを長くするほど、その周囲に被覆絶縁体を介して形成する検出コイルの巻き数を増加させることができるため、MIセンサ素子の出力を大きくすることができる。
特に、ICチップもしくはこれを搭載するIC基板にMIセンサ素子を実装するにあたり、磁性アモルファスワイヤの長手方向がICチップ及びIC基板の主面の法線方向(Z軸方向)となるようにする場合には、磁性アモルファスワイヤの長さを大きくしようとすると、MIセンサ素子がICチップの厚み方向に大きくなってしまう。そのため、MIセンサ素子を実装したICチップを携帯端末機器等に内蔵するにあたり、機器の薄型化が困難となってしまうという問題がある。
しかし、従来のZ軸用のMIセンサ素子においては、製造上の理由から、磁性アモルファスワイヤの長さとMIセンサ素子の全体の長とを同等とすることは困難である。
そうすると、MIセンサ素子を基体よりも長手方向に突出させることはできないため、その一方の端部は、段部よりも基体の内側に配置されることとなる。それゆえ、少なくとも段部の高さ分、基体の長さよりも磁性アモルファスワイヤの長さを短くせざるを得ず、MIセンサ素子の感度が低下してしまう。
また、溝を形成するためには基体の強度を確保するために厚みを大きくすることとなり、MIセンサ素子の小型化が困難となる。また、溝加工を行う場合には、その切削加工を容易にすべく、比較的強度の低い材料を基体に用いることとなる。すると、その分、基体の厚みをさらに厚くする必要があり、MIセンサ素子の小型化がさらに難しくなる。
該基体上に保持された磁性アモルファスワイヤと、
該磁性アモルファスワイヤが内側を貫通するように形成した被覆絶縁体と、
該被覆絶縁体の周囲に形成した検出コイルと、
上記基体における上記磁性アモルファスワイヤを配置した側の表面から立ち上がる端子搭載面を有する絶縁体からなる端子台と、
上記端子搭載面に形成したワイヤ用電極端子及びコイル用電極端子と、
上記ワイヤ用電極端子と上記磁性アモルファスワイヤに設けた一対のワイヤ通電端とを電気的に接続するワイヤ用接続配線と、
上記コイル用電極端子と上記検出コイルに設けた一対のコイル通電端とを電気的に接続するコイル用接続配線とを有し、
上記端子搭載面は、その法線が上記磁性アモルファスワイヤの長手方向成分を有し、かつ、上記磁性アモルファスワイヤの長手方向における、該磁性アモルファスワイヤの両端の間に配置されていることを特徴とするマグネトインピーダンスセンサ素子にある。
上記マグネトインピーダンスセンサ素子(MIセンサ素子)は、上記端子搭載面を有する上記端子台を備えている。そして、端子搭載面は、上記磁性アモルファスワイヤの長手方向における、該磁性アモルファスワイヤの両端の間に配置されている。これにより、端子台の端子搭載面に、ワイヤ用電極端子及びコイル用電極端子を容易に形成することができると共に、上記磁性アモルファスワイヤの長手方向における上記基体の全体にわたって、磁性アモルファスワイヤを配設することができる。その結果、基体の大きさを大きくすることなく、磁性アモルファスワイヤを長くすることができ、MIセンサ素子の大型化を招くことなく、感度を高くすることができる。
また、溝を形成する必要がないため基体の厚みを特に大きくする必要がなく、MIセンサ素子の小型化が容易となる。また、切削加工の容易化も特に考慮する必要がなくなるため、強度の高い材料を基体に用いることもでき、その分、基体の厚みをさらに小さくすることもでき、MIセンサ素子の小型化がさらに容易となる。
この場合には、MIセンサ素子をICチップ等に実装するにあたり、磁性アモルファスワイヤがICチップの主面に直交するように配置する際、ワイヤ用電極端子及びコイル用電極端子をICチップの主面と平行にすることができる。その結果、ワイヤ用電極端子及びコイル用電極端子と、ICチップとの間のワイヤボンディング等、電気的接続を容易に行うことができる。
この場合には、上記端子台が上記磁性アモルファスワイヤ、被覆絶縁体、及び検出コイルを覆うことがないため、磁性アモルファスワイヤへかかる応力や、磁性アモルファスワイヤへの結露等を防ぎ、正確な磁界検出を確保することができる。
この場合には、仮に上記ワイヤ用電極端子及びコイル用電極端子の法線が上記磁性アモルファスワイヤの長手方向成分を有していないと、ICチップの主面に形成された電子回路の端子との接続が困難である。それゆえ、基体における磁性アモルファスワイヤを形成した表面に上記ワイヤ用電極端子及びコイル用電極端子を設けることは望ましくなく、上記表面に対して角度をもった面、より好ましくは直交する面にワイヤ用電極端子及びコイル用電極端子を形成する。
そこで、このようなMIセンサ素子において、本発明を適用することにより、その作用効果を充分に発揮させることができる。
ICチップを搭載したIC基板を介してMIセンサ素子を間接的に電気的接続するような場合には、上記のごとく該IC基板の主面の法線方向に上記磁性アモルファスワイヤの長手方向が向くようにMIセンサ素子を実装することにより、IC基板の主面に形成された電子回路の端子と上記ワイヤ用電極端子及びコイル用電極端子との接続が容易となる。そしてそのような構成において、本発明の作用効果が充分に発揮できる。
本発明の実施例にかかるマグネトインピーダンスセンサ素子につき、図1~図6を用いて説明する。
本例のマグネトインピーダンスセンサ素子(MIセンサ素子)1は、図1~図3に示すごとく、非磁性体からなる基体2と、該基体2上に保持された磁性アモルファスワイヤ3と、該磁性アモルファスワイヤ3が内側を貫通するように形成した被覆絶縁体4と、該被覆絶縁体4の周囲に形成した検出コイル5とを有する。
端子搭載面61には、一対のワイヤ用電極端子11及び一対のコイル用電極端子12が形成されている。ただし、一対のワイヤ用電極端子11のうちの一方と一対のコイル用電極端子12の一方とが一つの電極を基準電位として共有するようにすることもできる。この場合、ワイヤ用電極端子11及びコイル用電極端子12の合計数を3個とすることができる。
コイル用電極端子12と検出コイル5に設けた一対のコイル通電端51とは、コイル用接続配線120によって電気的に接続されている。
端子搭載面61は、その法線が磁性アモルファスワイヤ3の長手方向成分を有し、かつ、磁性アモルファスワイヤ3の長手方向における、磁性アモルファスワイヤ3の両端311、311の間に配置されている。
また、図1、図3に示すごとく、端子台6は、磁性アモルファスワイヤ3、被覆絶縁体4、及び検出コイル5の形成領域以外の領域に形成されている。すなわち、端子台6は、ワイヤ用接続配線110及びコイル用接続配線120の一部を覆うように、基体2の表面に形成されているが、磁性アモルファスワイヤ3、被覆絶縁体4、及び検出コイル5を覆わないように、これらの形成領域とは外れた位置において形成されている。
MIセンサ素子1において、ICチップ7に実装したときICチップ7の主面71に直交する方向となる方向をZ軸方向という。すなわち磁性アモルファスワイヤ3の長手方向と一致する方向がZ軸方向である。
磁性アモルファスワイヤ3は、零磁歪アモルファスのCoFeSiB系合金からなり、例えば、直径20μm以下とすることができる。ここでは、直径を10μmとした。そして、この磁性アモルファスワイヤ3は、図1に示すごとく、基体2の表面21に、基体2のZ軸方向の全体にわたって配設されている。本例では、この磁性アモルファスワイヤ3の長さは0.6mmとした。
また、磁性アモルファスワイヤ3の一対の通電端31の間の部分は、被覆絶縁体4によって被覆されている。被覆絶縁体4は、例えば、酸化アルミニウム、酸化ケイ素などの無機質の絶縁材料やエポキシ系樹脂などの有機質の絶縁材料を用いて構成することができる。
ワイヤ用接続配線110の他端は、ワイヤ用電極端子11に接続され、コイル用接続配線120の他端は、コイル用電極端子12に接続されている。
この端子搭載面61に、上記一対のワイヤ用電極端子11及び一対のコイル用電極端子12を設けている。
また、端子台6の厚み、すなわち端子搭載面61の幅は、例えば80~150μmである。ここでは、端子搭載面61の幅を100μmとした。
なお、この接続の仕方は、一例であって、例えばMIセンサ素子1におけるワイヤ用電極端子11及びコイル用電極端子12のすべてをICチップ7の端子に接続してもよいし、IC基板73の端子に接続してもよい。
なお、ここでは、本例のZ軸用のMIセンサ素子1を、X軸用及びY軸用のMIセンサ素子10、100と組み合わせて、3軸の磁気方位センサ70としたが、本例のMIセンサ素子1を含む2つのMIセンサ素子によって2軸の磁気方位センサを構成することもできる。
また、本例のMIセンサ素子1は、このような磁気方位センサに限らず、例えば、電流センサ等に用いることもできる。この場合には、本例のMIセンサ素子1を一つだけ用いてセンサを構成することもできる。
このとき、基体2の表面21には、端子台6の形成も行う。端子台6を形成するに当たっては、例えば感光性のエポキシ樹脂を用いることができる。すなわち、基体2の表面21の全体に樹脂を塗布した後、乾燥させ、次いで、端子台6を形成したい部分のみに光が当たるようにマスキングした状態で樹脂を露光する。次いで、現像液にて現像することにより、所定の位置に所定の大きさ、形状の端子台6を形成する。
端子台6、ワイヤ用電極端子11及びコイル用電極端子12以外の形成方法については、省略したが、MIセンサ素子1のすべての要素を形成した後、図6に示すごとく、基体ウエハ20を、ダイシングソーを用いて切断し、個々のMIセンサ素子1を得る。このとき、ダイシングソーの切り代201(例えば200μm)を考慮して、切断面がMIセンサ素子1の所望の輪郭となるようにする。
上記マグネトインピーダンスセンサ素子1は、端子搭載面61を有する端子台6を備え、端子搭載面61は、磁性アモルファスワイヤ3の長手方向における、磁性アモルファスワイヤ3の両端311、311の間に配置されている。これにより、端子台6の端子搭載面61に、ワイヤ用電極端子11及びコイル用電極端子12を容易に形成することができると共に、磁性アモルファスワイヤ3の長手方向における基体2の全体にわたって、磁性アモルファスワイヤ3を配設することができる。その結果、基体2の大きさを大きくすることなく、磁性アモルファスワイヤ3を長くすることができ、MIセンサ素子1の大型化を招くことなく、感度を高くすることができる。
また、溝を形成する必要がないため基体2の厚みを特に大きくする必要がなく、MIセンサ素子1の小型化が容易となる。また、切削加工の容易化も特に考慮する必要がなくなるため、強度の高い材料を基体2に用いることもでき、その分、基体2の厚みをさらに小さくすることもでき、MIセンサ素子1の小型化がさらに容易となる。
すなわち、MIセンサ素子1を図7に示す電子回路8に組み込み、以下のような磁気センシング評価を行った。
上記電子回路8は、MIセンサ素子1の磁性アモルファスワイヤ3に入力するためのパルス信号を発振するパルス発振回路81と、MIセンサ素子1の検出コイル5において生じた検出電圧を信号処理するための信号処理回路82とを有する。信号処理回路82は、検出コイル5と出力端子83との間のスイッチングを行うアナログスイッチ821と、パルス信号に連動してアナログスイッチ821のオンオフを行うサンプルタイミング調整回路822と、検出コイル5において生じた誘起電圧を増幅する増幅器823とを有する。
まず、MIセンサ素子1の磁性アモルファスワイヤ3の長手方向(Z軸方向)が鉛直方向を向いた状態を、回転角度0°とし、このときのMIセンサ素子1の出力信号の大きさを0mVとする。そして、このMIセンサ素子1を、水平軸を中心に360°回転させた。このときの出力信号の変化を図8に示す。
本例は、図9、図10に示すごとく、実施例1に比べて端子台6の大きさを小さくした例である。
すなわち、端子台6のZ軸方向の高さを短くしている。具体的には、実施例1のMIセンサ素子1における端子台6の高さ0.4mmに対して、本例のMIセンサ素子1における端子台6の高さは0.13mmとした。
その他は、実施例1と同様である。
本例は、図11~図13に示すごとく、実施例1、2において示した端子台6を設けることなく、基体92に直接、ワイヤ用電極端子11及びコイル用電極端子12を設けたマグネトインピーダンスセンサ素子9の例である。
本例のMIセンサ素子9は、実施例1、2と同様に、基体92の表面921に磁性アモルファスワイヤ93、被覆絶縁体4、検出コイル5、ワイヤ用接続配線110、コイル用接続配線120を形成してなる。そして、基体92における磁性アモルファスワイヤ93の長手方向(Z軸方向)の一端に段部96を有し、そのZ軸方向に直交する面に、ワイヤ用電極端子11及びコイル用電極端子12を設けてなる。
上記段部96は、基体92におけるZ軸方向及び厚み方向に直交する方向(図11の左右方向)の全体にわたって形成されている。
なお、磁性アモルファスワイヤ93、被覆絶縁体4、及び検出コイル5からなる構成体の構成は、実施例1と同様であって、その大きさや検出コイル5の巻数等も同様である。
すなわち、かかるMIセンサ素子9を製造するに当たっては、上述したごとく、多数のMIセンサ素子9の基体92の母材である基体ウエハ920に、多数のMIセンサ素子9のパターニングを一度に行った後、図14(B)に示すごとく、基体ウエハ920をダイシングソー98によって切断して、個々のMIセンサ素子9に切り分ける。
そして、図14(C)に示すごとく、切断後には、この溝99の一部分が上記段部96として残ることとなる。
すなわち、上記のようなZ軸用のMIセンサ素子9は、上記のごとく、磁性アモルファスワイヤ93と直交する面にワイヤ用電極端子11及びコイル用電極端子12を形成する必要があるため、上記基体92の表面921と直交する面を、基体92に形成する必要がある。それゆえ、溝加工を行わないと、基体ウエハ920の状態のままでワイヤ用電極端子11及びコイル用電極端子12のパターニングを行うことができない。溝加工を行わない場合、切り離された基体2の一つ一つに対して個別に電極端子の形成を行わねばならず、生産性が著しく低下する。それゆえ、溝加工を行うことにより、基体ウエハ920の一体性を保ったまま、電極端子の形成が行えるようにしている。
その結果、MIセンサ素子9の厚みも大きくなることとなる。
このように、本例のMIセンサ素子9は、磁性アモルファスワイヤ3の長さを長くしつつ、小型化を図ることが困難である。
また、本発明のMIセンサ素子1は、上記のような溝加工の必要もないため、基体2の厚みを大きくする必要もなく、さらなる小型化を可能とする。
比較例のMIセンサ素子9の基体92のZ軸方向の下端923から段部96までの高さは0.6mmで、段部96から上端922までの高さが0.07mmである。また、段部96からのボンディングワイヤ72のZ軸方向高さは0.15mmである。それゆえ、比較例のMIセンサ素子の占有高さH(図12)は、H=0.6mm+0.15mm=0.75mmである。
したがって、比較例のMIセンサ素子の小型化指標φは、φ=0.75mm/0.6mm=1.25となる。
すなわち、実施例1のMIセンサ素子は、比較例のMIセンサ素子に対して、Z軸方向に20%の小型化を実現している。つまり、同じ磁性アモルファスワイヤの長さ、すなわち同じ磁気感度を確保しつつ、Z軸方向の小型化を20%実現することができる。
すなわち、この場合、比較例のMIセンサ素子9の小型化指標φは、φ=0.67mm/0.6mm≒1.12となり、実施例1のMIセンサ素子1の小型化指標φは、φ=0.6mm/0.6mm=1となる。それゆえ、この場合でも、約10%の小型化を実現することができる。
これに対し、実施例1のMIセンサ素子1では、溝加工を考慮する必要がないため、強度の高いセラミックスを使用しており、基体2の厚みを0.3mmとしている。そして、端子台6の厚み(0.1mm)を加えても、MIセンサ素子1の厚みは0.4mmとなる。すなわち、MIセンサ素子の厚みについても、比較例に比べて、実施例1の方が薄くすることができる。
以上のような実施例1と比較例との差異は、実施例2と比較例との間においても同様のことが言える。
Claims (5)
- 非磁性体からなる基体と、
該基体上に保持された磁性アモルファスワイヤと、
該磁性アモルファスワイヤが内側を貫通するように形成した被覆絶縁体と、
該被覆絶縁体の周囲に形成した検出コイルと、
上記基体における上記磁性アモルファスワイヤを配置した側の表面から立ち上がる端子搭載面を有する絶縁体からなる端子台と、
上記端子搭載面に形成したワイヤ用電極端子及びコイル用電極端子と、
上記ワイヤ用電極端子と上記磁性アモルファスワイヤに設けた一対のワイヤ通電端とを電気的に接続するワイヤ用接続配線と、
上記コイル用電極端子と上記検出コイルに設けた一対のコイル通電端とを電気的に接続するコイル用接続配線とを有し、
上記端子搭載面は、その法線が上記磁性アモルファスワイヤの長手方向成分を有し、かつ、上記磁性アモルファスワイヤの長手方向における、該磁性アモルファスワイヤの両端の間に配置されていることを特徴とするマグネトインピーダンスセンサ素子。 - 請求項1において、上記端子搭載面は、その法線が上記磁性アモルファスワイヤの長手方向となるように形成されていることを特徴とするマグネトインピーダンスセンサ素子。
- 請求項1又は2において、上記端子台は、上記磁性アモルファスワイヤ、被覆絶縁体、及び検出コイルの形成領域以外の領域に形成されていることを特徴とするマグネトインピーダンスセンサ素子。
- 請求項1~3のいずれか一項において、電子回路を形成してなるICチップに、該ICチップの主面の法線方向に上記磁性アモルファスワイヤの長手方向が向くように実装するための素子であることを特徴とするマグネトインピーダンスセンサ素子。
- 請求項1~3のいずれか一項において、電子回路を形成してなるICチップを搭載したIC基板に、該IC基板の主面の法線方向に上記磁性アモルファスワイヤの長手方向が向くように実装するための素子であることを特徴とするマグネトインピーダンスセンサ素子。
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