Sensor switch

Abstract

An inductive switch includes a ceramic body made by stacking and sintering a plurality of ceramic green sheets, a first conductive unit and a second conductive unit made of a metal material and disposed on the ceramic green sheets, and a conductive member. The ceramic body includes a middle layer portion, a lower layer portion, and an upper layer portion defining a cavity, the middle layer portion having an inner surface, and the lower layer portion having a blind hole open to the cavity. The first conductive unit includes a first conductive layer covering the inner surface of the middle layer portion. The second conductive unit includes a second conductive layer at least disposed in the blind hole and having a concave shape. The conductive member is conductive and can be rolled in the cavity, and the conductive member is used to form a current path with the first conductive layer and the second conductive layer. By making the ceramic body made by stacking and sintering the ceramic green sheets, the inductive switch can break through existing limitations and effectively reduce the overall volume.

Description

Technical Field

[0001] The invention relates to a switch, in particular to an inductive switch. Background Art

[0002] The existing ball-type induction switch is used to be set on a circuit board, and uses the internal ball to sense the change of angle, and transmits the sensing result to the circuit board, so it can be used for security alarm devices, anti-theft devices, toys that can sense motion, etc. However, the existing ball-type induction switch has many parts and its size is limited and difficult to reduce. Summary of the invention

[0003] The object of the present invention is to provide an induction switch which can reduce parts and size.

[0004] The inductive switch of the present invention comprises a ceramic body, a first conductive unit, a second conductive unit, and a conductive member.

[0005] The ceramic body is made by stacking and sintering multiple ceramic green bodies, and includes a middle layer portion defining a cavity, a lower layer portion disposed at the bottom of the middle layer portion and closing the bottom end of the cavity, and an upper layer portion disposed at the top of the middle layer portion and closing the top end of the cavity, the middle layer portion having an inner surface adjacent to the cavity, the lower layer portion having a top surface adjacent to the cavity, and a blind hole formed on the top surface and open to the cavity.

[0006] The first conductive unit is made of a metal material disposed on the ceramic green body, and includes a first conductive layer covering the inner surface of the middle layer, and at least one first internal circuit connected to the first conductive layer and extending to the outside of the ceramic body. The second conductive unit is made of a metal material disposed on the ceramic green body, and includes a second conductive layer at least disposed in the blind hole and in a concave shape, and at least one second internal circuit connected to the second conductive layer and extending outward to the outside of the ceramic body.

[0007] The conductive member can be rolled in the chamber, and can move between a first path position and an off-circuit position. When the conductive member is in the first path position, the first conductive layer, the conductive member, and the second conductive layer form a current path. When the conductive member is in the off-circuit position, the first conductive layer, the conductive member, and the second conductive layer do not form a current path. When the ceramic body is horizontally placed in the order of the lower layer portion, the middle layer portion, and the upper layer portion from bottom to top, the conductive member is restricted by the second conductive layer and positioned in the off-circuit position.

[0008] In the inductive switch of the present invention, the lower layer of the ceramic body further has an inner hole surface connected to the top surface, and an end surface connected to the inner hole surface, the inner hole surface and the end surface define the blind hole, and the second conductive layer of the second conductive unit covers the inner hole surface and the top surface of the lower layer.

[0009] In the inductive switch of the present invention, the angle between the inner hole surface and the top surface of the lower layer of the ceramic body is an obtuse angle.

[0010] In the inductive switch of the present invention, the second conductive layer of the second conductive unit is stacked in the blind hole, and the second conductive layer has a top surface for contacting the conductive member. The top surface of the second conductive layer is arc-shaped and concave in a direction away from the cavity.

[0011] In the inductive switch of the present invention, the blind hole in the lower layer of the ceramic body further has an open end and a closed end, the second conductive layer of the second conductive unit extends to the closed end of the blind hole, and the second internal circuit connects the second conductive layer at the closed end and extends outward.

[0012] In the inductive switch of the present invention, the first internal circuit of the first conductive unit extends between the middle layer portion and the lower layer portion of the ceramic body or between the middle layer portion and the upper layer portion.

[0013] In the inductive switch of the present invention, the conductive member is spherical or cylindrical, and has a radius of r. The lower layer, the middle layer and the upper layer of the ceramic body are stacked along an axis. The maximum rolling distance of the conductive member in the chamber perpendicular to the axis is d, and 3r <d<4r。

[0014] The inductive switch of the present invention comprises an upper portion of the ceramic body having a bottom surface and a blind hole formed on the bottom surface and open to the chamber. The inductive switch further comprises a third conductive unit, which is made of a metal material and arranged on a corresponding ceramic green body, and comprises at least a third conductive layer arranged in the blind hole of the upper portion and in an upward concave shape, and at least one third internal circuit connected to the third conductive layer and extending outward to the outside of the ceramic body. The conductive member can move between a second passage position, the first passage position and the disconnection position. When the conductive member is in the second passage position, the first conductive layer, the conductive member and the third conductive layer form a current passage. When the conductive member is in the disconnection position, the first conductive layer, the conductive member, the second conductive layer and the third conductive layer do not form a current passage. When the ceramic body is inverted and placed horizontally, the conductive member is restricted by the third conductive layer and is positioned at the disconnection position.

[0015] The inductive switch of the present invention, the upper layer of the ceramic body has a bottom surface adjacent to the cavity, the inductive switch further comprises a third conductive unit, the third conductive unit is made of a metal material arranged on a corresponding ceramic green body, and comprises a third conductive layer arranged on the upper layer, and at least one third internal circuit connected to the third conductive layer and extending outward to the outside of the ceramic body, the third conductive layer has a protruding portion protruding from the bottom surface of the upper layer, the conductive member can move between a second passage position, the first passage position and the disconnection position, when the conductive member is in the second passage position, the first conductive layer, the conductive member and the third conductive layer form a current passage, when the conductive member is in the disconnection position, the first conductive layer, the conductive member, the second conductive layer and the third conductive layer do not form a current passage, when the ceramic body is inverted and placed horizontally, the conductive member is restricted by the protruding portion of the third conductive layer and is positioned at the second passage position.

[0016] In the inductive switch of the present invention, the first conductive unit and the second conductive unit are made of metal material by applying conductive glue to a screen, a steel plate or inkjet, or by alternately using electroplating, chemical plating, sputtering, etc., and then are stacked and sintered together.

[0017] The beneficial effects of the present invention are as follows: by utilizing the ceramic body that is made by stacking and sintering the ceramic green sheets, and by utilizing the first conductive unit and the second conductive unit that are made by being provided with a metal material on the ceramic green sheets, the inductive switch can be integrated to effectively reduce the number of parts, and the overall volume can break through the minimum volume limit of existing switches made of plastic, thereby obtaining a more streamlined structure and a smaller volume, and at the same time, better sealing can be obtained, so that the first conductive unit and the second conductive unit are not easily damaged by moisture. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, in which:

[0019] Figure 1 is a three-dimensional diagram of a first embodiment of the induction switch of the present invention;

[0020] Figure 2 is a top view of the first embodiment;

[0021] Figure 3 is along Figure 2 The cross-sectional schematic diagram obtained along the line III-III in FIG. 1 shows that a ceramic body is made of a plurality of ceramic green sheets stacked together, but the ceramic green sheets are actually sintered into one piece after being made without being layered;

[0022] Figure 4 is along Figure 2 A schematic cross-sectional view taken along line IV-IV in FIG.

[0023] Figure 5 is along Figure 2 A schematic cross-sectional view taken along line V-V in FIG. 1 illustrates a state of a conductive member in an open circuit position and a first passage position;

[0024] Figure 6 is a perspective exploded schematic diagram of the first embodiment, illustrating that the first embodiment is made of a plurality of ceramic green bodies stacked;

[0025] Figure 7 is a second embodiment of the inductive switch of the present invention similar to Figure 5 A cross-sectional schematic diagram illustrating a state of a conductive member in an open circuit position and a first path position;

[0026] Figure 8 is along Figure 7 A schematic cross-sectional view taken along line VIII-VIII in FIG.

[0027] Fig. 9 is a third embodiment of the inductive switch of the present invention similar to Figure 5 A cross-sectional schematic diagram illustrating a state of a conductive member in an open circuit position and a first path position;

[0028] Fig.10 is a perspective view of a fourth embodiment of the induction switch of the present invention;

[0029] Fig.11 is a top view of the fourth embodiment;

[0030] Fig.12 is along Fig.11 A schematic cross-sectional view taken along line ⅩⅡ-ⅩⅡ in FIG.

[0031] Fig.13 is along Fig.11 A schematic cross-sectional view taken along line ⅩⅢ-ⅩⅢ in FIG.

[0032] Fig.14 is along Fig.11 a schematic cross-sectional view taken along line XIV-XIV in FIG.

[0033] Fig.15 The fourth embodiment is similar to Fig.14 A cross-sectional schematic diagram illustrating a ceramic body in an inverted and horizontal position. DETAILED DESCRIPTION

[0034] Before the present invention is described in detail, it should be noted that similar components are denoted by the same reference numerals in the following description.

[0035] In addition, in the description of the present invention, the terms “upper”, “lower”, “top” and “bottom” are used only to conveniently indicate the relative positions of components, and do not limit the directions in which each component is actually manufactured or used.

[0036] See also Figures 1 to 3 A first embodiment of the inductive switch of the present invention comprises a ceramic body 1, a first conductive unit 2, a second conductive unit 3, a third conductive unit 4, an external electrode unit 5, and a conductive member 6.

[0037] See also Figure 3 , Figure 4 and Figure 6 The ceramic body 1 is made by stacking and sintering a plurality of ceramic green bodies 100. The ceramic body 1 is in the shape of a rectangular parallelepiped and includes a middle layer 11 defining a chamber 10, a lower layer 12 arranged along an axis L at the bottom of the middle layer 11 and closing the bottom end of the chamber 10, and an upper layer 13 arranged along the axis L at the top of the middle layer 11 and closing the top end of the chamber 10.

[0038] The middle layer 11 has an inner surface 111 adjacent to the chamber 10, the lower layer 12 has a top surface 121 adjacent to the chamber 10, an inner hole surface 122 connected to the top surface 121, and an end surface 123 connected to the inner hole surface 122, the inner hole surface 122 and the end surface 123 define a blind hole 124 formed on the top surface 121 and open to the chamber 10. The upper layer 13 of the ceramic body 1 has a bottom surface 131 adjacent to the chamber 10, an inner hole surface 132 connected to the bottom surface 131, and an end surface 133 connected to the inner hole surface 132, the inner hole surface 132 and the end surface 133 define a blind hole 134 formed on the bottom surface 131 and open to the chamber 10. The inner hole surface 122 of the lower portion 12 and the top surface 121 form an angle θ1, which is an obtuse angle. The outline of the blind hole 124 perpendicular to the axis L is circular, and has an open end 124a and a closed end 124b. Specifically, the inner hole surface 122 has a vertical portion 122a substantially perpendicular to the top surface 121 and extending from the open end 124a to the closed end 124b, and a chamfered portion 122b connected between the vertical portion 122a and the top surface 121 and forming the angle with the top surface 121. The blind hole 134 of the upper portion 13 also has an open end 134a and a closed end 134b. In this embodiment, the structures of the upper portion 13 and the lower portion 12 are symmetrical to each other, so they are not described in detail here.

[0039] The first conductive unit 2 is made of a metal material and is disposed on the corresponding ceramic green body 100. The first conductive unit 2 includes a first conductive layer 21 covering the inner surface 111 of the middle layer 11, and at least one first internal circuit 22 connected to the first conductive layer 21 and extending to the outside of the ceramic body 1. In this embodiment, the first conductive unit 2 includes four first internal circuits 22, and two of the first internal circuits 22 extend between the middle layer 11 and the lower layer 12 of the ceramic body 1, and the other two extend between the middle layer 11 and the upper layer 13, and the first internal circuits 22 extend outward along the corresponding ceramic green body 100 to two opposite sides of the ceramic body 1.

[0040] The second conductive unit 3 is made of a metal material and is disposed on the corresponding ceramic green body 100. The second conductive unit 3 includes a second conductive layer 31 that is at least disposed in the blind hole 124 and is concave, and at least one second internal circuit 32 that is connected to the second conductive layer 31 and extends outward to the outside of the ceramic body. In this embodiment, the second conductive layer 31 covers the inner hole surface 122 and the top surface 121 of the lower layer 12, and extends to the closed end 124b of the blind hole 124, and the second conductive unit 3 includes two second internal circuits 32, which are connected to the second conductive layer 31 at the closed end 124b and extend outward along the corresponding ceramic green body 100 to the other two opposite sides of the ceramic body 1.

[0041] The third conductive unit 4 is made of a metal material and is disposed on the corresponding ceramic green body 100, and includes a third conductive layer 41 which is at least disposed in the blind hole 134 of the upper layer 13 and is in an upward concave shape, and at least one third internal circuit 42 connected to the third conductive layer 41 and extending outward to the outside of the ceramic body. In this embodiment, the third conductive layer 41 covers the inner hole surface 132 and the bottom surface 131 of the upper layer 13, and extends to the closed end 134b of the blind hole 134, and the third conductive unit 4 includes two third internal circuits 42, the third internal circuits 42 are connected to the third conductive layer 41 at the closed end 134b, and extend outward along the corresponding ceramic green body 100 to the two opposite sides of the ceramic body 1, and the extension direction is the same as that of the second internal circuit 32.

[0042] See also Figure 1 , Figure 3 and Figure 4, the external electrode unit 5 is disposed on the outer surface of the ceramic body 1. The external electrode unit 5 includes four first external electrodes 51 respectively connected to the first internal circuit 22, and four second external electrodes 52 respectively connected to the second internal circuit 32 and the third internal circuit 42. The first external electrodes 51 and the second external electrodes 52 are respectively disposed at the corners of the ceramic body 1 and cover three adjacent planes of the ceramic body 1. In addition, two of the second external electrodes 52 are connected integrally along one side of the ceramic body 1 to facilitate determining the direction of the inductive switch from the outside and connecting the first conductive unit 2 and the second conductive unit 3 in series.

[0043] Refer to Figure 5 , the conductive member 6 is rollably located in the chamber 10. The conductive member 6 can be in a first passage position (see the position of the dotted line at a point in Figure 5 ), a second passage position (not shown in the figure, symmetric to the first passage position), and an open circuit position (see the position of the solid line in Figure 5 ). When the conductive member 6 is in the first passage position, the first conductive layer 21, the conductive member 6, and the second conductive layer 31 form a current path. When the conductive member 6 is in the second passage position, the first conductive layer 21, the conductive member 6, and the third conductive layer 41 form a current path. When the conductive member 6 is in the open circuit position, the first conductive layer 21, the conductive member 6, the second conductive layer 31, and the third conductive layer 41 do not form a current path. In addition, when the ceramic body 1 is inverted and placed horizontally, the conductive member 6 is positioned at the open circuit position due to the limitation of the third conductive layer 41. When the ceramic body 1 is placed horizontally with the lower layer 12, the middle layer 11, and the upper layer 13 in sequence from bottom to top, the conductive member 6 is positioned at the open circuit position due to the limitation of the second conductive layer 31.

[0044] In this embodiment, the conductive member 6 is spherical with a radius of r, and the chamber 10 is cylindrical around the axis L. The maximum rolling distance of the conductive member 6 perpendicular to the axis L in the chamber 10 is d, and 3r < d < 4r. In other embodiments, the conductive member 6 can also be cylindrical, and the chamber 10 can be rectangular to match, but not limited thereto. In addition, in this embodiment, the conductive member 6 rolls completely from the blind hole 124 of the lower layer 12 above the top surface 121 of the lower layer 12 (or rolls completely from the blind hole 134 of the upper layer 13 above the bottom surface 131 of the upper layer 13 when inverted), and its rolling angle θ2 is 45°, but not limited thereto.

[0045] In use, the inductive switch is used by soldering the first external electrode 51 and the second external electrode 52 of the external electrode unit 5 to a circuit board (not shown in the figure). Among them, due to the arrangement positions of the first external electrode 51 and the second external electrode 52, the inductive switch can be soldered to the circuit board in different directions according to the needs of users or manufacturers.

[0046] During the use process, when the ceramic body 1 is horizontally placed in the order of the lower layer 12, the middle layer 11, and the upper layer 13 from bottom to top, the conductive member 6 is positioned by the shape of the second conductive layer 31 and only contacts the second conductive layer 31. At this time, the conductive member 6 is located at the open circuit position (see the position of the solid line in Figure 5 ), and no current path is formed; when the ceramic body 1 is tilted or vibrated, the conductive member 6 is disengaged from the positioning of the second conductive layer 31 and simultaneously contacts the first conductive layer 21 and the second conductive layer 31, the conductive member 6 is located at the first path position (see the position of the dashed-dotted line in Figure 5 ), and the first conductive layer 21, the conductive member 6, and the second conductive layer 31 form a current path, thereby achieving the induction effect. And in this embodiment, since the structure is symmetric up and down, the same induction effect can also be achieved when the ceramic body 1 is used upside down.

[0047] Furthermore, it should be noted that in this embodiment, the relationship between the radius r of the conductive member 6 and the maximum rolling distance d perpendicular to the axis L is 3r < d < 4r, which can effectively reduce the overall volume and avoid overly sensitive induction at the same time.

[0048] In addition, in other embodiments, the inductive switch may also include two or more conductive members 6. For example, two conductive members 6 with smaller radii are jointly accommodated in the chamber 10, and when the ceramic body 1 is horizontally placed, the conductive members 6 are simultaneously positioned by the shape of the second conductive layer 31 and located at the open circuit position.

[0049] Refer to Figure 3 、 Figure 4 and Figure 6 , it should be noted that this embodiment is made by multi-layer ceramic (MLC) technology, and the manufacturing process is described as follows:

[0050] Step 1: Prepare a plurality of ceramic green bodies 100 made of inorganic ceramic materials, and form holes in the ceramic green bodies 100 by mechanical processing.

[0051] Step 2: Applying a metal material, such as silver, gold, palladium, copper or nickel or their alloys, to a conductive paste by a screen, a steel plate or inkjet processing, or by electroplating, chemical plating, sputtering and other methods, and alternately using and setting it on the surface of the corresponding ceramic green body 100 to form the first conductive unit 2, the second conductive unit 3 and the third conductive unit 4.

[0052] Step 3: The punched and circuit-set ceramic green bodies 100 are stacked and aligned along the axis L, and then the stacked ceramic green bodies 100 are compacted by hot water equalization to form the aforementioned lower layer 12, the middle layer 11, and the upper layer 13, wherein the ceramic green bodies 100 constitute the lower layer 12, the middle layer 11, and the upper layer 13, and the metal material disposed on the ceramic green bodies 100 constitutes the first conductive unit 2, the second conductive unit 3, and the third conductive unit 4. In this embodiment, the lower layer 12 is formed by stacking two layers of ceramic green bodies 100, the middle layer 11 is formed by stacking eight layers of ceramic green bodies 100, and the upper layer 13 is formed by stacking two layers of ceramic green bodies 100, but it is not limited thereto. In addition, in this embodiment, the lower layer 12 and the middle layer 11 are stacked and hot-pressed together, while the upper layer 13 is stacked and hot-pressed separately.

[0053] Step 4: cutting the tightly compacted ceramic green body 100 into a predetermined size.

[0054] Step 5: slowly raise the ambient temperature to between 400 and 600 degrees Celsius, heat the cut ceramic green body 100, burn and crack the polymer additives added during the slurrying of the ceramic green body 100, and then raise the ambient temperature to between 800 and 900 degrees Celsius to densify the ceramic green body 100 and remove the pores. It should be noted that the ceramic green bodies 100 will be sintered into one after heating. Figure 3 , Figure 4 and Figure 5 The layered state shown in the figure is only used to illustrate that the ceramic body 1 is composed of multiple layers of ceramic green bodies 100, and is not the actual structural state after sintering.

[0055] Step 6: Plate, spray or apply protective metal, such as gold, alloy, etc., on the surfaces of the first conductive unit 2 , the second conductive unit 3 and the third conductive unit 4 as required.

[0056] Step Seven: Place the conductive member 6 into the chamber 10 of the middle layer portion 11. Then, apply an adhesive material such as resin or glass to the corresponding areas between the upper layer portion 13 and the middle layer portion 11. Next, heat the ambient temperature to between 300 degrees Celsius and 500 degrees Celsius by means of UV light irradiation or baking to heat the adhesive material, and press and bond the upper layer portion 13 and the middle layer portion 11 together to form the complete ceramic body 1.

[0057] Step Eight: Coat, spray, or apply metal, such as silver, gold, palladium, copper, nickel, etc. or their alloys, onto the outer surface of the bonded ceramic body 1 to form the first external electrode 51 and the second external electrode 52 of the aforementioned external electrode unit 5.

[0058] It should be supplementary noted that after Step Two, the ceramic green body 100 provided with metal can also be first bonded to form one or more blocks, and then sintered into one or more ceramic blocks in the subsequent steps, and then the above ceramic blocks are bonded with glass, metal, or resin and heat-treated to form the integrated ceramic body 1, not limited to the manner of the aforementioned steps.

[0059] In addition, the manufacturing process of the induction switch of the present invention can be adjusted by those with ordinary knowledge in the art according to requirements for the order of some steps, or some manufacturing methods can be replaced in other ways, not limited to the description in this specification.

[0060] Summarize the advantages of this embodiment through the above description as follows:

[0061] 1. Since the ceramic body 1 is made by stacking and sintering the ceramic green body 100, and the first conductive unit 2, the second conductive unit 3, and the third conductive unit 4 are made of metal materials disposed on the ceramic green body 100, the overall volume of the induction switch can break through the minimum volume limit of the existing switches made of plastic, obtaining a more streamlined structure and a smaller volume. In addition, better sealing performance can also be obtained, and the first conductive unit 2, the second conductive unit 3, and the third conductive unit 4 are not easily damaged by moisture.

[0062] 2. By virtue of the inner hole surface 122 of the lower layer portion 12 having the chamfer portion 122b, the attachment area of the second conductive layer 31 can be increased to avoid the shedding of metal materials and affect the induction. Since the upper layer portion 13 and the lower layer portion 12 have a symmetrical structure, the attachment area of the third conductive layer 41 can be increased and have the same effect.

[0063] 3. By virtue of the relationship between the radius r of the conductive member 6 and the maximum rolling distance d perpendicular to the axis L being 3r < d < 4r, the overall volume can be effectively reduced while avoiding being overly sensitive.

[0064] Refer to Figure 7 and Figure 8 A second embodiment of the inductive switch of the present invention is similar to the first embodiment, except that:

[0065] The inner hole surfaces 122, 132 of the lower layer 12 and the upper layer 13 of the ceramic body 1 are inclined from the open ends 124a, 134a to the closed ends 124b, 134b, and respectively form an obtuse angle θ1 with the top surface 121 of the lower layer 12 and the bottom surface 131 of the upper layer 13. In addition, the cross-section of the blind holes 124, 134 perpendicular to the axis L is square.

[0066] See also Fig. 9 A third embodiment of the inductive switch of the present invention is similar to the first embodiment, except that:

[0067] The second conductive layer 31 of the second conductive unit 3 is stacked in the blind hole 124, and the second conductive layer 31 has a top surface 121 for contacting the conductive member 6, and the top surface 121 of the second conductive layer 31 is arc-shaped and concave in a direction away from the chamber 10. The structure of the three conductive units 4 is symmetrical with that of the second conductive unit 3, so it is not described here.

[0068] See also Figures 10 to 15 A fourth embodiment of the inductive switch of the present invention is similar to the third embodiment, except that:

[0069] See also Fig.12 The third conductive layer 41 of the third conductive unit 4 has a protruding portion 411 protruding from the bottom surface 131 of the upper layer 13, and the top surface 121 of the protruding portion 411 is in an arc shape and protrudes toward the second conductive layer 31. When the ceramic body 1 is inverted and placed horizontally, the conductive member 6 is restricted by the protruding portion 411 of the third conductive layer 41 and is positioned at the second path position.

[0070] See also Figures 10 to 14In addition, the first conductive unit 2 includes a first internal circuit 22, and the first internal circuit 22 extends along the corresponding ceramic green body 100 toward one of the side surfaces of the ceramic body 1. The external electrode unit 5 is arranged on the outer surface of the ceramic body 1, and includes a first external electrode 51 connected to the first internal circuit 22, two second external electrodes 52 respectively connected to the second internal circuit 32, and two third external electrodes 53 respectively connected to the third internal circuit 42. The second external electrode 52 and the third external electrode 53 extend from the bottom of the lower layer 12 to the top of the upper layer 13 along the four sides of the ceramic body 1, and the second external electrodes 52 are opposite to each other, and the first external electrode 51 is located between one of the second external electrodes 52 and one of the third external electrodes 53.

[0071] See also Fig.15 By connecting the second internal circuit 32 and the third internal circuit 42 to the second external electrode 52 and the third external electrode 53 respectively, and the shapes of the second conductive layer 31 and the third conductive layer 41 are matched, the inductive switch can effectively detect the states of the ceramic body 1 before and after inversion.

[0072] In summary, the inductive switch of the present invention utilizes the ceramic body 1 that is made by stacking and sintering the ceramic green sheets 100, and the first conductive unit 2, the second conductive unit 3 and the third conductive unit 4 that are made by being arranged on the ceramic green sheets 100 using metal materials, so that the inductive switch can be integrated and parts can be effectively reduced, and the overall volume can break through the minimum volume limit of the existing switch made of plastic, thereby obtaining a more streamlined structure and a smaller volume, and at the same time, better sealing can be obtained, so that the first conductive unit 2, the second conductive unit 3 and the third conductive unit 4 are not easily damaged by moisture, so the purpose of the present invention can be achieved.

[0073] The above are merely embodiments of the present invention and should not be used to limit the scope of the present invention. That is, any simple equivalent changes and modifications made according to the claims and description of the present invention still fall within the scope of the present invention.

Claims

1. An induction switch, characterized in that: Include: A ceramic body, which is made by stacking and sintering a plurality of ceramic green bodies, the ceramic body comprising a middle layer portion defining a cavity, a lower layer portion disposed at the bottom of the middle layer portion and closing the bottom end of the cavity, and an upper layer portion disposed at the top of the middle layer portion and closing the top end of the cavity, the middle layer portion having an inner surface adjacent to the cavity, the lower layer portion having a top surface adjacent to the cavity, and a blind hole formed on the top surface and open to the cavity; A first conductive unit is made of a metal material disposed on a corresponding ceramic green body, wherein the first conductive unit includes a first conductive layer covering an inner surface of the middle layer, and at least one first internal circuit connected to the first conductive layer and extending to the outside of the ceramic body; A second conductive unit is made of a metal material disposed on a corresponding ceramic green body, the second conductive unit comprising a second conductive layer at least disposed in the blind hole and in a concave shape, and at least one second internal circuit connected to the second conductive layer and extending outward to the outside of the ceramic body; and The conductive member can be rolled and positioned in the chamber, the conductive member can move between a first path position and a circuit-breaking position, when the conductive member is in the first path position, the first conductive layer, the conductive member and the second conductive layer form a current path, when the conductive member is in the circuit-breaking position, the first conductive layer, the conductive member and the second conductive layer do not form a current path, when the ceramic body is horizontally placed in a manner of sequentially forming the lower layer portion, the middle layer portion and the upper layer portion from bottom to top, the conductive member is restricted by the second conductive layer and positioned in the circuit-breaking position, The lower layer of the ceramic body also has an inner hole surface connected to the top surface, and The end surface is connected to the inner hole surface, the inner hole surface and the end surface define a blind hole of the lower layer, and the second conductive layer of the second conductive unit covers the inner hole surface and the top surface of the lower layer. The blind hole in the lower layer of the ceramic body also has an open end and a closed end. The second conductive layer of the second conductive unit extends to the closed end of the blind hole in the lower layer. The second internal circuit connects the second conductive layer at the closed end and extends outward.

2. The induction switch according to claim 1, characterized in that: The inner hole surface of the lower layer of the ceramic body and the top surface include an angle, and the angle is an obtuse angle.

3. The induction switch according to claim 1, characterized in that: The second conductive layer of the second conductive unit is stacked in the blind hole of the lower layer, and the second conductive layer has a top surface for contacting the conductive member. The top surface of the second conductive layer is arc-shaped and concave in a direction away from the cavity.

4. The induction switch according to claim 1, characterized in that: The first internal circuit of the first conductive unit extends between the middle layer portion and the lower layer portion of the ceramic body or between the middle layer portion and the upper layer portion.

5. The induction switch according to claim 1, characterized in that: The conductive member is spherical or cylindrical, and has a radius of r. The lower layer, the middle layer, and the upper layer of the ceramic body are stacked along an axis. The maximum rolling distance of the conductive member in the chamber perpendicular to the axis is d, and 3r <d<4r。 6. The induction switch according to claim 1, characterized in that: The upper portion of the ceramic body has a bottom surface, and a blind hole formed on the bottom surface and open to the chamber. The inductive switch further includes a third conductive unit, which is made of a metal material and is arranged on a corresponding ceramic green body, and includes at least a third conductive layer which is arranged in the blind hole of the upper portion and is concave upward, and at least one third internal circuit connected to the third conductive layer and extending outward to the outside of the ceramic body. The conductive member can move between a second passage position, the first passage position and the disconnection position. When the conductive member is in the second passage position, the first conductive layer, the conductive member and the third conductive layer form a current path. When the conductive member is in the disconnection position, the first conductive layer, the conductive member, the second conductive layer and the third conductive layer do not form a current path. When the ceramic body is inverted and placed horizontally, the conductive member is restricted by the third conductive layer and is positioned at the disconnection position.

7. The induction switch according to claim 1, characterized in that: The upper portion of the ceramic body has a bottom surface adjacent to the cavity. The inductive switch further includes a third conductive unit, which is made of a metal material and is arranged on a corresponding ceramic green body, and includes a third conductive layer arranged on the upper portion, and at least one third internal circuit connected to the third conductive layer and extending outward to the outside of the ceramic body. The third conductive layer has a protruding portion protruding from the bottom surface of the upper portion. The conductive member can move between a second passage position, the first passage position and the disconnection position. When the conductive member is in the second passage position, the first conductive layer, the conductive member and the third conductive layer form a current passage. When the conductive member is in the disconnection position, the first conductive layer, the conductive member, the second conductive layer and the third conductive layer do not form a current passage. When the ceramic body is inverted and placed horizontally, the conductive member is restricted by the protruding portion of the third conductive layer and is positioned at the second passage position.

8. The induction switch according to claim 1, characterized in that: The first conductive unit and the second conductive unit are made of metal material by applying conductive glue to a screen, a steel plate or inkjet processing, or by alternately using electroplating, chemical plating, and sputtering to set on corresponding ceramic green bodies, and then stacked and sintered together.

Images