Multi layer ceramic condenser and water temperature sensor module having tha same

Abstract

A multilayer ceramic capacitor and a water temperature sensor module equipped with the same are presented, which allow for easy mounting on a target and minimize parasitic components caused by the sensor. The presented multilayer ceramic capacitor includes a first terminal structure disposed on a first side of a dielectric with a first external electrode in between and a second terminal structure disposed on a second side of a dielectric with a second external electrode in between. The first terminal structure and the second terminal structure include a main conductor having a contact surface that contacts one of the first external electrode and the second external electrode, a terminal that is fitted into a socket terminal of a water temperature sensor, and a connecting conductor that connects the main conductor and the terminal.

Description

Technology Field

[0001] The present invention relates to a capacitor, and more specifically, to a multilayer ceramic capacitor mounted in a vehicle and a water temperature sensor module equipped with the same. Background Technology

[0002] A water temperature sensor module is installed in the vehicle's coolant passage to measure the coolant temperature. The water temperature sensor module includes a multilayer ceramic capacitor to prevent signal errors caused by EMC noise generated by the sensor and to filter out noise.

[0003] The multilayer ceramic capacitors applied to conventional water temperature sensor modules are configured as lead types and are mounted to the water temperature sensor through processes such as soldering.

[0004] However, conventional multilayer ceramic capacitors are configured as lead types, which increases the mounting height and thus the mounting space, resulting in a problem of reduced space utilization.

[0005] In addition, conventional multilayer ceramic capacitors have a problem in that parasitic components generated in the wires increase because they are configured as lead types.

[0006] In addition, conventionally, there is a problem of reduced work efficiency because workers install multilayer ceramic capacitors in water temperature sensor modules through manual work such as soldering.

[0007] In addition, conventional multilayer ceramic capacitors are installed in water temperature sensor modules using soldering or the like, so there is a problem of reduced reliability due to unstable adhesion. Prior art literature

[0008] Korean Published Patent No. 10-2008-0063040 The problem to be solved

[0009] The present invention is proposed to solve the aforementioned problems and aims to provide a multilayer ceramic capacitor that can be easily mounted on an installation target while minimizing parasitic components caused by the sensor, and a water temperature sensor module equipped with the same. means of solving the problem

[0010] To achieve the above-mentioned objective, a multilayer ceramic capacitor according to an embodiment of the present invention comprises a dielectric, a first external electrode disposed on a first side of the dielectric, a second external electrode disposed on a second side of the dielectric and facing the first external electrode with the dielectric in between, a first terminal structure disposed on the first side of the dielectric with the first external electrode in between, and a second terminal structure disposed on the second side of the dielectric with the second external electrode in between, wherein the first terminal structure and the second terminal structure comprise a main conductor having a contact surface that contacts one of the first external electrode and the second external electrode, a terminal that is fitted and coupled to a socket terminal of a water temperature sensor, and a connecting conductor that connects the main conductor and the terminal.

[0011] A step is formed between the connecting conductor and the terminal, and the cross-section of the second end of the connecting conductor can be formed to have a larger area than the cross-section of the terminal.

[0012] The terminal is inserted into a socket hole formed in the socket terminal, and the cross-section of the terminal may be circular.

[0013] Meanwhile, the connecting conductor may include a horizontal conductor, the first end of which is connected to the main conductor and the second end of which is extended outwardly from one of the first and second sides of the dielectric and positioned at a location spaced apart from the main conductor, and a vertical conductor, the first end of which is connected to the second end of the horizontal conductor and the second end of which is extended downwardly from the dielectric and positioned parallel to the main conductor.

[0014] At this time, the main conductor has a first side and a second side opposite to the first side, and a slit formed in the direction of the center point of the main conductor is defined on the second side so that an opening is defined on the second side, and the first end of the horizontal conductor can be connected to the first end of the opening adjacent to the center point of the main conductor.

[0015] To achieve the above-mentioned objective, a water temperature sensor module according to an embodiment of the present invention is mounted in a vehicle and includes a thermistor, a connector connected to the thermistor, a socket terminal connected to the connector, a multilayer ceramic capacitor inserted and mounted in the socket terminal, and a temperature sensor connected to the socket terminal.

[0016] The socket terminal includes a first terminal having a first socket hole formed therein and a second terminal having a second socket hole formed therein, and the multilayer ceramic capacitor may include a first terminal structure in which a first end is connected to a first external electrode disposed on a first side of the dielectric and a second end is inserted into the first socket hole, and a second terminal structure in which a first end is connected to a second external electrode disposed on a second side of the dielectric and a second end is inserted into the second socket hole.

[0017] At this time, the first terminal structure and the second terminal structure may include a main conductor having a contact surface that contacts one of the first external electrode and the second external electrode, a terminal inserted into one of the first socket hole and the second socket hole, and a connecting conductor that connects the main conductor and the terminal.

[0018] The connecting conductor may include a horizontal conductor, the first end of which is connected to the main conductor and the second end of which extends outwardly from one of the first and second sides of the dielectric and is positioned at a location spaced apart from the main conductor, and a vertical conductor, the first end of which is connected to the second end of the horizontal conductor and the second end of which extends downwardly from the dielectric and is positioned parallel to the main conductor. In this case, the main conductor has a first side and a second side opposite to the first side, and a slit formed in the direction of the center point of the main conductor is defined on the second side so that an opening is defined on the second side, and the first end of the horizontal conductor may be connected to the first end of the opening adjacent to the center point of the main conductor. Effects of the invention

[0019] According to the present invention, by forming a bend in the connecting conductor of the terminal structure, the multilayer ceramic capacitor has the effect of minimizing parasitic components while minimizing mounting height and improving space utilization.

[0020] In addition, since the water temperature sensor module is installed in the socket terminal by plugging in a multilayer ceramic capacitor, it does not require an additional attachment process, making installation easy and enabling a more stable installation, which has the effect of improving reliability. Brief explanation of the drawing

[0021] FIGS. 1 and FIGS. 2 are drawings for illustrating a multilayer ceramic capacitor according to an embodiment of the present invention. FIGS. 3 to 5 are drawings for explaining the terminal structure of FIG. 1. FIG. 6 is a drawing illustrating a modified example of a multilayer ceramic capacitor according to an embodiment of the present invention. FIGS. 7 to 10 are drawings for explaining the terminal structure of FIG. 6. FIGS. 11 and FIGS. 12 are drawings for illustrating a water temperature sensor module according to an embodiment of the present invention. FIG. 13 is a diagram illustrating the method of coupling a multilayer ceramic capacitor to the socket terminal in FIG. 12. Specific details for implementing the invention

[0022] Hereinafter, in order to provide a detailed explanation sufficient for a person skilled in the art to easily implement the technical concept of the present invention, the most preferred embodiment of the present invention will be described with reference to the accompanying drawings. First, it should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the present invention, such detailed description is omitted.

[0023] Referring to FIGS. 1 and 2, a multilayer ceramic capacitor (100) according to an embodiment of the present invention comprises a dielectric (110), a first external electrode (120), a second external electrode (130), a first terminal structure (140a) and a second terminal structure (140b).

[0024] The dielectric (110) has an upper surface, a lower surface, a first side, a second side, a third side, and a fourth side. At this time, the upper surface is opposite to the lower surface, the first side is opposite to the second side, and the third side is opposite to the fourth side. Accordingly, the dielectric (110) is exemplified as being composed of a rectangular parallelepiped having an upper surface, a lower surface, a first side, a second side opposite to the first side, a third side, and a fourth side opposite to the third side. Here, the dielectric (110) may be composed of a laminate in which a plurality of dielectric (110) sheets having internal electrodes formed thereon are stacked.

[0025] A plurality of internal electrodes are arranged within the dielectric (110). The plurality of internal electrodes are sequentially stacked to form a stacked body arranged within the dielectric (110). The plurality of internal electrodes are configured to include a plurality of first internal electrodes and a plurality of second internal electrodes. The plurality of first internal electrodes and the plurality of second internal electrodes are arranged (stacked) alternately.

[0026] A plurality of first internal electrodes are connected to a first external electrode (120) on a first side of a first variant dielectric (110). A plurality of first internal electrodes are spaced apart from a second external electrode (130) disposed on a second side of a second variant dielectric (110) opposite to the first side.

[0027] The first internal electrode is composed of a plate-shaped conductor formed in a rectangular shape. The first internal electrode has a first side connected to the first external electrode (120), a second side opposite to the first side, a third side connected to one end of the first side and the second side, and a fourth side connected to the other end of the first side and the second side and opposite to the third side.

[0028] The second internal electrode is composed of a plate-shaped conductor formed in a rectangular shape. The second internal electrode has a first side connected to the second external electrode (130), a second side opposite to the first side, a third side connected to one end of the first side and the second side, and a fourth side connected to the other end of the first side and the second side and opposite to the third side.

[0029] A plurality of first internal electrodes and a plurality of second internal electrodes are alternately stacked. In this case, as an example, a dielectric sheet (110) having a first internal electrode formed thereon and a dielectric sheet (110) having a second internal electrode formed thereon are alternately stacked to form a laminate.

[0030] A plurality of first internal electrodes are connected to a first external electrode (120) on a first side of a first variant dielectric (110) and are spaced apart from a second external electrode (130) disposed on a second side of a second variant dielectric (110) facing the first side. A plurality of second internal electrodes are connected to a second external electrode (130) on a second side of a first variant dielectric (110) and are spaced apart from a first external electrode (120) disposed on a first side of a second variant dielectric (110) facing the first side.

[0031] Accordingly, a plurality of first internal electrodes and a plurality of second internal electrodes form an overlapping region within the dielectric (110), and form a capacitance in the overlapping region.

[0032] The first external electrode (120) is an electrode disposed on the first side of the dielectric (110). The first external electrode (120) may be formed by extending in the direction of the second external electrode (130) from the upper surface, lower surface, third side, and fourth side of the dielectric (110).

[0033] The second external electrode (130) is an electrode disposed on the second side of the dielectric (110). The second external electrode (130) may be formed by extending in the direction of the first external electrode (120) from the upper surface, lower surface, third side, and fourth side of the dielectric (110).

[0034] At this time, the first external electrode (120) and the second external electrode (130) may be formed to face each other at a predetermined distance from the upper surface, lower surface, third side, and fourth side of the dielectric (110).

[0035] The first terminal structure (140a) is a terminal structure disposed on the first side of the dielectric (110). As the first terminal structure (140a) is disposed on the first side of the dielectric (110), the first external electrode (120) is interposed between the first terminal structure (140a) and the first side of the dielectric (110). The first end of the first terminal structure (140a) is inserted into the socket terminal of the water temperature sensor to electrically connect the first external electrode (120) and the socket terminal.

[0036] The second terminal structure (140b) is a terminal structure disposed on the second side of the dielectric (110). As the second terminal structure (140b) is disposed on the second side of the dielectric (110), the second external electrode (130) is interposed between the second terminal structure (140b) and the second side of the dielectric (110). The first end of the second terminal structure (140b) is inserted into the socket terminal of the water temperature sensor to electrically connect the second external electrode (130) and the socket terminal.

[0037] Referring to FIG. 3, the terminal structure (140; i.e., the first terminal structure (140a) and the second terminal structure (140b)) is configured to include a main conductor (141), a connecting conductor (142), and a terminal (143).

[0038] The main conductor (141) is composed of a plate-shaped conductor. The main conductor (141) is composed of a plate-shaped conductor having a first surface that is a contact surface with an external electrode, a second surface opposite to the first surface, a first side, a second side opposite to the first side, a third side connecting the first end of the first side and the first end of the second side, and a fourth side connecting the second end of the first side and the second end of the second side. The main conductor (141) forms a contact surface connected to an external electrode (the first external electrode (120) or the second external electrode (130)).

[0039] The connecting conductor (142) is composed of a plate-shaped conductor that connects the main conductor (141) and the terminal (143). The first end of the connecting conductor (142) is connected to the side of the main conductor (141), and the terminal (143) is connected to the second end of the connecting conductor (142).

[0040] A step is formed at the second end of the connecting conductor (142) to maintain a constant mounting height of the multi-sided ceramic capacitor (100). In other words, a step (S) is formed between the connecting conductor (142) and the terminal (143). At this time, the cross-section of the connecting conductor (142) is formed to have a wider area than the cross-section of the terminal (143) to form the step.

[0041] The terminal (143) is inserted into the socket terminal of the water temperature sensor. The terminal (143) is fitted into the socket terminal of the water temperature sensor. The first end of the terminal (143) is connected to the second end of the connecting conductor (142), and the second end of the terminal (143) is inserted into the socket terminal. At this time, the second end of the terminal (143) passes through the socket terminal and is electrically connected to the socket terminal through soldering or the like.

[0042] The cross-section of the terminal (143) can be formed in various shapes, such as circular, elliptical, or square, depending on the hole shape of the socket terminal into which the terminal (143) is inserted.

[0043] Referring to FIG. 4, the cross-section of the terminal (143) may be formed in a circular shape. The cross-section of the terminal (143) is formed in a circular shape having the same diameter as the hole of the socket terminal. At this time, the same diameter is not limited to the diameter of the cross-section of the terminal (143) being exactly the same as the diameter of the hole of the socket terminal. The same diameter may mean that the diameter of the terminal (143) is smaller than the diameter of the hole of the socket terminal, provided that the terminal (143) is maintained so that it does not shake or easily fall out after being inserted into the hole of the socket terminal. Here, the diameter of the cross-section of the terminal (143) may be formed differently depending on the water temperature sensor module, so the numerical value is not limited.

[0044] Referring to FIG. 5, the cross-section of the terminal (143) may be formed as a rectangle. The cross-section of the terminal (143) may be formed as a rectangle having a diagonal length equal to the diameter of the hole of the socket terminal. Here, the diagonal length of the cross-section of the terminal (143) may be formed differently depending on the water temperature sensor module, so the value is not limited.

[0045] Referring to FIG. 6, a multilayer ceramic capacitor (100) according to an embodiment of the present invention may be configured to include a terminal structure (140) in which a bend is formed in a connecting conductor (142) to minimize mounting height.

[0046] Generally, if the ratio (i.e., H / L) of the horizontal length (L) of the dielectric (110) and the external electrode and the height (H) from the lower surface of the dielectric (110) to the mounting surface of the socket terminal is configured to be approximately 0.1 or more, the sound pressure level caused by the resonance of the socket terminal can be effectively suppressed.

[0047] Specifically, if the ratio (H / L) is configured to be approximately 0.1 or higher, the sound pressure level caused by the resonance of the socket terminal can be reduced by approximately 40% or more compared to the case where the ratio (H / L) is 0. In addition, in the region where the ratio (H / L) exceeds approximately 0.35, the sound pressure level caused by the resonance of the socket terminal does not change significantly even if the ratio (H / L) increases.

[0048] A multilayer ceramic capacitor (100) according to an embodiment of the present invention forms a bend in the connecting conductor (142) of the terminal structure (140) within a range that can effectively suppress the sound pressure level, thereby minimizing the mounting height of the multilayer ceramic capacitor (100).

[0049] Referring to FIG. 7, a slit is defined in the main conductor (141) of the terminal structure (140) in the direction of the center point of the main conductor (141) from the second side of the main conductor (141). The first end of the slit is positioned adjacent to the center point of the main conductor (141), and the second end of the slit is positioned on the second side of the main conductor (141) to form an opening.

[0050] Referring to FIGS. 8 to 10, the connecting conductor (142) is configured to include a horizontal conductor (142a) and a vertical conductor (142b).

[0051] The horizontal conductor (142a) is composed of a plate-shaped conductor. The first end of the horizontal conductor (142a) is connected to the first end of the slit. The second end of the horizontal conductor (142a) is positioned at a predetermined distance from the main conductor (141). At this time, the horizontal conductor (142a) is positioned to be orthogonal to the main conductor (141). Of course, the horizontal conductor (142a) may also be positioned to form a predetermined angle with the main conductor (141).

[0052] The vertical conductor (142b) is composed of a plate-shaped conductor. The first end of the vertical conductor (142b) is connected to the second end of the horizontal conductor (142a). The second end of the vertical conductor (142b) extends downward and is positioned at a predetermined distance from the second end of the horizontal conductor (142a). At this time, the vertical conductor (142b) is positioned parallel to the main conductor (141) and may overlap with the slit formed in the main conductor (141).

[0053] A bend is formed between the horizontal conductor (142a) and the vertical conductor (142b). At this time, a bend with an angle of approximately 90 degrees between the horizontal conductor (142a) and the vertical conductor (142b) may be formed. Of course, a bend with an acute or obtuse angle between the horizontal conductor (142a) and the vertical conductor (142b) may be formed.

[0054] Through this, the multilayer ceramic capacitor (100) can minimize mounting height by forming a “L” shape in which the connecting conductor (142) extends outward from the second surface of the main conductor (141) and is then bent downward.

[0055] In addition, the multilayer ceramic capacitor (100) can minimize mounting space by minimizing mounting height and minimize vibration through stable fixation.

[0056] Referring to FIGS. 11 and 12, a water temperature sensor module (200) according to an embodiment of the present invention comprises a housing (210), a thermistor (220), a first wire (230), a second wire (240), a connector (250), a socket terminal (260), a multilayer ceramic capacitor (100), and a temperature sensor (270). At this time, the multilayer ceramic capacitor (100) is installed to filter noise and prevent signal errors caused by EMC noise generated from the temperature sensor (270).

[0057] The thermistor (220) is positioned inside the housing (210), specifically at the bottom of the housing (210) that is inserted into the coolant. The thermistor (220) forms a resistance value according to the temperature of the coolant.

[0058] The first end of the first wire (230) and the second wire (240) is connected to the thermistor (220). The second end of the first wire (230) and the second wire (240) is connected to a connector (250). The connector (250) is connected to the first end of the first wire (230) and the second wire (240) and is connected to a socket terminal (260).

[0059] The socket terminal (260) is connected to the connector (250) and the temperature sensor (270). At this time, the socket terminal (260) is configured to include a first terminal (261) and a second terminal (262).

[0060] The first end of the first terminal (261) is connected to a temperature sensor (270). The second end of the first terminal (261) is connected to a connector (250) and connected to a first wire (230). A first socket hole (263) is formed in the first terminal (261) into which an electrode of the first terminal structure (140a) is inserted.

[0061] The first end of the second terminal (262) is connected to the temperature sensor (270). The second end of the second terminal (262) is connected to the connector (250) and connected to the second wire (240). A second socket hole (264) is formed in the second terminal (262) into which the electrode of the second terminal structure (140b) is inserted.

[0062] Referring to FIG. 13, a multilayer ceramic capacitor (100) is fixedly installed in a socket terminal (260) that connects a thermistor (220) and a temperature sensor (270). The multilayer ceramic capacitor (100) is installed in the socket terminal (260) by inserting a terminal structure (140) into a socket hole formed in the socket terminal (260). That is, the multilayer ceramic capacitor (100) is fixedly installed in the socket terminal (260) as the first terminal structure (140a) is inserted into the first socket hole (263) and the electrode of the second terminal structure (140b) is inserted into the second socket hole (264).

[0063] As such, since the water temperature sensor module (200) is installed in the socket terminal (260) by plugging in the multilayer ceramic capacitor (100), it does not require a separate attachment process, making installation easy and increasing space utilization compared to the conventional lead type.

[0064] In addition, the water temperature sensor module (200) can enable stable mounting of the multilayer ceramic capacitor (100) and reduce parasitic components.

[0065] Meanwhile, the multilayer ceramic capacitor (100) can be fixedly installed on the socket terminal (260) by soldering the terminal (143) of the terminal structure (140) that penetrates the socket hole together with the socket terminal (260). The multilayer ceramic capacitor (100) can also be fixedly installed on the socket terminal (260) by deforming (bending, bending, etc.) the terminal (143) of the terminal structure (140) that penetrates the socket hole.

[0066] The temperature sensor (270) is connected to the thermistor (220) via a socket terminal (260), a connector (250), and a wire, and measures the temperature of the coolant based on the resistance value formed by the thermistor (220).

[0067] Although preferred embodiments according to the present invention have been described above, various modifications are possible, and it is understood that those skilled in the art can implement various variations and modifications without departing from the scope of the claims of the present invention. Explanation of the symbols

[0068] 100: Multilayer ceramic capacitor 110: Dielectric 120: First external electrode 130: Second external electrode 140: Terminal structure 141: Main conductor 142: Connecting conductor 142a: Horizontal conductor 142b: Vertical conductor 143: Terminal 200: Water temperature sensor module 210: Housing 220: Thermistor 230: First Frontline 240: Second wire 250: Connector 260: Socket terminal 261: First terminal 262: Second terminal 263: First socket hole 264: Second socket hole 270: Temperature sensor

Claims

Claim 1 A dielectric; a first external electrode disposed on a first side of the dielectric; a second external electrode disposed on a second side of the dielectric and facing the first external electrode with the dielectric in between; a first terminal structure disposed on the first side of the dielectric with the first external electrode in between; and a second terminal structure disposed on the second side of the dielectric with the second external electrode in between, wherein the first terminal structure and the second terminal structure each comprise a main conductor having a contact surface that contacts one of the first external electrode and the second external electrode; a terminal that is fitted and coupled to a socket terminal of a water temperature sensor; and a connecting conductor that connects the main conductor and the terminal, wherein the connecting conductor comprises a horizontal conductor that is connected to a slit formed in the direction of the center point of the main conductor and extends outwardly. A multilayer ceramic capacitor comprising a vertical conductor that is connected to the end of the horizontal conductor and extends downward in the dielectric and is positioned parallel to the main conductor, wherein the horizontal conductor has a first end connected to the main conductor and a second end extending outward from one of the first and second sides of the dielectric and is positioned at a location spaced apart from the main conductor, and the vertical conductor has a first end connected to the second end of the horizontal conductor and a second end extending downward in the dielectric and is positioned parallel to the main conductor, wherein the main conductor has a first side and a second side opposite to the first side, and a slit formed in the direction of the center point of the main conductor is defined on the second side so as to define an opening on the second side, and the first end of the horizontal conductor is connected to the first end of the opening adjacent to the center point of the main conductor. Claim 2 A multilayer ceramic capacitor according to claim 1, wherein a step is formed between the connecting conductor and the terminal. Claim 3 delete Claim 4 delete Claim 5 A water temperature sensor module mounted in a vehicle comprises: a thermistor; a connector connected to the thermistor; a socket terminal connected to the connector; a multilayer ceramic capacitor inserted and mounted in the socket terminal; and a temperature sensor connected to the socket terminal, wherein the multilayer ceramic capacitor includes a terminal structure inserted into the socket terminal and connected to an external electrode of a dielectric, and the terminal structure includes a main conductor having a contact surface that contacts the external electrode; a terminal that is fitted and coupled to the socket terminal; and a connecting conductor connecting the main conductor and the terminal, wherein the connecting conductor is a horizontal conductor that is connected to a slit formed in the direction of the center point of the main conductor and extends outwardly. A water temperature sensor module comprising a vertical conductor that is connected to the end of the horizontal conductor and extends in the downward direction of the dielectric and is positioned parallel to the main conductor, wherein the horizontal conductor has a first end connected to the main conductor and a second end extending outward from one of the first and second sides of the dielectric and is positioned at a location spaced apart from the main conductor, and the vertical conductor has a first end connected to the second end of the horizontal conductor and a second end extending in the downward direction of the dielectric and is positioned parallel to the main conductor, wherein the main conductor has a first side and a second side opposite to the first side, and a slit formed in the direction of the center point of the main conductor is defined on the second side so as to define an opening on the second side, and the first end of the horizontal conductor is connected to the first end of the opening adjacent to the center point of the main conductor. Claim 6 In paragraph 5, the above-mentioned socket terminal comprises a first terminal having a first socket hole formed therein; and a second terminal having a second socket hole formed therein, comprising a water temperature sensor module. Claim 7 In claim 6, the terminal structure comprises: a first terminal structure in which a first end is connected to a first external electrode disposed on a first side of the dielectric and a second end is inserted into the first socket hole; and a second terminal structure in which a first end is connected to a second external electrode disposed on a second side of the dielectric and a second end is inserted into the second socket hole, thereby forming a water temperature sensor module. Claim 8 delete Claim 9 delete Claim 10 delete Claim 11 delete Claim 12 delete

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