CN211783609U

CN211783609U - Sensor

Info

Publication number: CN211783609U
Application number: CN202020632210.3U
Authority: CN
Inventors: 费友健; 娄帅; 刘召利
Original assignee: Nanjing Xinligan Electronic Technology Co ltd
Current assignee: Nanjing Xinligan Electronic Technology Co ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2020-10-27
Anticipated expiration: 2030-04-23

Abstract

The utility model provides a sensor, this sensor includes: the device comprises a shell, a first connecting piece and a second connecting piece, wherein an installation space is arranged in the shell, and a medium channel communicated with the installation space is arranged at one end of the shell; a ceramic circuit board disposed in the mounting space, the ceramic circuit board including a first ceramic board, a second ceramic board, and a plurality of conductive structures; a PCB circuit board disposed in the mounting space; the pressure sensitive chip and the thermistor are arranged on the second ceramic plate and are positioned in the medium channel, and the pressure sensitive chip and the thermistor are electrically connected with the PCB through at least one conductive structure. The utility model discloses an integrated pressure sensitive chip and thermistor to design one kind and can satisfy simultaneously and carry out independent transmission's ceramic circuit board to the sensing signal of pressure sensitive chip and thermistor, thereby realize carrying out the sensing to pressure and a plurality of parameters of temperature simultaneously, pressure sensitive chip and thermistor and required conducting structure all integrate on same ceramic circuit board in addition, and are small.

Description

Sensor

Technical Field

The utility model relates to a parameter monitoring technical field, in particular to sensor.

Background

The sensor senses signals through the sensing unit, can convert the signals into usable output electric signals according to a certain rule, and then is processed into a corresponding required analog output or digital output form through the signal processing unit, and the sensor is mainly used for measuring parameters of various media (such as gas and liquid), such as pressure, temperature and the like.

Temperature sensors and pressure sensors are the two sensors used by the sensor industry most frequently and need to be used together. The temperature sensor mainly senses the temperature of the medium using the characteristics of the thermistor, and the pressure sensor mainly senses the pressure of the medium using the characteristics of the pressure sensitive chip.

In the prior art, each traditional sensor can only be used for measuring one physical quantity, and with the increasing development of automatic monitoring technology, a sensor with a single measuring function cannot meet the requirement, in practical use, a plurality of parameters are often required to be measured at one position at the same time, particularly temperature and pressure parameters are often required to be obtained at the same time, for example, if the parameters are measured separately by adopting separate temperature sensors and pressure sensors, the identity of the position of a measured point is difficult to ensure, and two types of sensors are purchased respectively, so that the cost is high.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model aims at providing a sensor to solve the technical problem that the sensor in the middle of the prior art can't measure a plurality of parameters simultaneously.

According to the utility model discloses among the embodiment a sensor, the sensor includes:

the device comprises a shell, a sensor and a controller, wherein an installation space is arranged in the shell, and a medium channel communicated with the installation space is arranged at one end of the shell;

a ceramic circuit board disposed in the installation space and blocking the installation space and the medium passage, the ceramic circuit board including a first ceramic board, a second ceramic board disposed on a surface of the first ceramic board facing the medium passage, and a plurality of conductive structures disposed on the first ceramic board and the second ceramic board, the conductive structures including a first through hole disposed on the first ceramic board, a first conductive medium disposed in the first through hole, a second through hole disposed on the second ceramic board, a second conductive medium disposed in the second through hole, and a conductive line printed on a surface of the first ceramic board and connecting the first conductive medium and the second conductive medium;

the PCB circuit board is arranged in the mounting space, and the first conductive medium is electrically connected with the PCB circuit board;

the pressure sensitive chip and the thermistor are arranged on the second ceramic plate and are positioned in the medium channel, the pressure sensitive chip and the thermistor are electrically connected with the PCB through at least one conductive structure, and the pressure sensitive chip and the thermistor are respectively electrically connected with the corresponding second conductive medium.

Furthermore, one end of the first conductive medium is soldered to the first ceramic board after passing through the first through hole, and the other end of the first conductive medium is soldered to the PCB board after passing through the PCB board.

Further, the first conductive medium is fixedly arranged on a substrate in a penetrating mode, and the substrate is connected between the PCB and the first ceramic board.

Furthermore, a first pouring sealant is filled between the second ceramic plate and the inner wall of the shell, the first pouring sealant covers the first through hole and the part, exposed on the surface of the first ceramic plate, of the conducting circuit, and a second pouring sealant is filled in the installation space.

Further, the pressure sensitive chip and the thermistor are flip-chip bonded to a surface of the second ceramic board facing an inlet of the medium passage.

Furthermore, protective glue is filled between the pressure sensitive chip and the thermistor as well as between the second ceramic plate.

Furthermore, a first mounting groove with a notch leading to the mounting space and a second mounting groove arranged at the bottom of the first mounting groove are formed in the joint of the mounting space and the medium channel, the medium channel is communicated with the bottom of the second mounting groove, the substrate is mounted in the first mounting groove, the ceramic circuit board is accommodated in the second mounting groove, the diameter of the second ceramic board is smaller than that of the medium channel, and the first pouring sealant is filled in the second mounting groove.

Furthermore, an opening is formed in one end, far away from the medium channel, of the shell, and the sensor further comprises a plug connector which is electrically connected with the PCB and led out from the opening.

The embodiment of the utility model provides a still provide a preparation method of sensor, the sensor is foretell sensor, the method includes:

preparing a ceramic circuit board;

one end of a first conductive medium is welded on a first ceramic plate of the ceramic circuit board after penetrating through a first through hole of the ceramic circuit board;

respectively printing soldering paste on the end faces of the second through holes of the ceramic circuit board so as to enable the soldering paste to be connected with the second conductive medium in the corresponding second through holes;

inversely mounting the pressure sensitive chip and the thermistor on soldering paste at corresponding positions, and inversely mounting and welding through a reflow furnace;

filling protective glue among the pressure sensitive chip, the thermistor and the second ceramic plate to obtain a whole package;

the packaging whole is arranged in an installation space of a shell, and the packaging whole and the shell are welded and fixed through a laser welding process;

installing a PCB in the installation space, enabling the other end of the first conductive medium to penetrate through the PCB and then be welded on the PCB, and filling a first pouring sealant in a second installation groove of the installation space;

and welding the plug connector to the corresponding position of the PCB, and filling a second pouring sealant in the installation space.

Compared with the prior art: through integrating pressure sensitive chip and thermistor to design one kind and can satisfy simultaneously and carry out independent transmission's ceramic circuit board to the sensing signal of pressure sensitive chip and thermistor, thereby realize sensing a plurality of parameters of pressure and temperature simultaneously, pressure sensitive chip and thermistor and required electrically conductive structure all integrate on same ceramic circuit board in addition, and are small, make the product have miniaturized advantage.

Drawings

Fig. 1 is a structural view of a sensor according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 3 is an enlarged view taken at I in FIG. 2;

fig. 4 is an exploded assembly view of the internal components of the sensor according to the first embodiment of the present invention;

fig. 5 is an assembly view of the internal components of the sensor in a first embodiment of the invention;

fig. 6 is a sectional view of the housing in the first embodiment of the present invention;

fig. 7 is a flowchart of a method for manufacturing a sensor according to a second embodiment of the present invention.

Description of the main element symbols:

shell body	10	Ceramic circuit board	20
				PCB circuit board	30	Pressure sensitive chip	40
Thermal resistor	50	Plug-in connector	60
				Installation space	11	Media channel	12
Opening of the container	13	First ceramic plate	21
				Second ceramic plate	22	Conductive structure	23
First through hole	231	A first conductive medium	232
				Second through hole	233	A second conductive medium	234
Conductive circuit	235	First potting adhesive	14
				Substrate	15	First mounting groove	111
Second mounting groove	112	Second potting adhesive	16
				Protective adhesive	17

The following detailed description of the invention will be further described in conjunction with the above-identified drawings.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Several embodiments of the invention are given in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 6, a sensor according to a first embodiment of the present invention includes a housing 10, a ceramic circuit board 20 disposed in the housing 10, a PCB circuit board 30, a pressure sensitive chip 40, a thermistor 50, and a connector 60 connected to the PCB circuit board 30 and extending out of the housing 10.

The housing 10 is provided with an installation space 11 inside, one end of the housing 10 is provided with a medium channel 12 communicated with the installation space 11, and one end of the housing 10 far away from the medium channel 12 is provided with an opening 13. The ceramic circuit board 20 is disposed in the mounting space 11 and blocks the mounting space 11 and the medium passage 12. In particular, the housing 10 may be provided with threads or snap-fit structures on the outer wall of the end portion where the media channel 12 is located to facilitate assembly of the sensor of the present application to a device or apparatus requiring pressure and temperature testing.

Referring to fig. 2 to 4, the ceramic circuit board 20 includes a first ceramic board 21, a second ceramic board 22 disposed on a surface of the first ceramic board 21 facing the medium channel 12, and a plurality of conductive structures 23 disposed on the first ceramic board 21 and the second ceramic board 22, wherein a diameter of the second ceramic board 22 is smaller than a diameter of the first ceramic board 21, and the second ceramic board 22 is disposed on a central portion of the first ceramic board 21. The conductive structure 23 specifically includes a first through hole 231 provided on the first ceramic board 21, a first conductive medium 232 provided in the first through hole 231, a second through hole 233 provided on the second ceramic board 22, a second conductive medium 234 provided in the second through hole 233, and a conductive trace 235 printed on the surface of the first ceramic board 21 and connecting the first conductive medium 232 and the second conductive medium 234. Specifically, one end of the first conductive medium 232 is soldered to the first ceramic board 21 through the first through hole 231 by solder, and one end of the conductive trace 235 extends into the first through hole 231 so that the first conductive medium 232 passes through the first through hole 231 to communicate with one end of the conductive trace 235, while the other end of the conductive trace 235 extends into the second through hole 233 so that the second conductive medium 234 fills the second through hole 233 to communicate with the other end of the conductive trace 235, thereby communicating the first conductive medium 232 with the second conductive medium 234. In an implementation, the first conductive medium 232 may be a probe, and the second conductive medium 234 may be a conductive material filled in the second via 233 or a conductive layer coated on the inner wall of the second via 233.

In addition, the first potting adhesive 14 is filled between the second ceramic plate 22 and the inner wall of the housing 10, the first potting adhesive 14 plays a role of blocking the medium, and prevents the medium from penetrating into the installation space 11, and the first potting adhesive 14 also covers the first through hole 231 and the part of the conductive trace 235 exposed on the surface of the first ceramic plate 21, so as to protect the conductive trace 235 and the welding point of the first conductive medium 232 and the first ceramic plate 21. As shown in fig. 3, the conductive trace 235 is partially located between the first ceramic plate 21 and the second ceramic plate 22, and the rest is exposed on the surface of the first ceramic plate 21. In particular embodiments, the first ceramic plate 21 and the second ceramic plate 22 may be integrally sintered by a glass sintering process.

The PCB 30 is disposed in the mounting space 11, and the first conductive medium 232 is electrically connected to the PCB 30, so that the PCB 30 is indirectly connected to the second conductive medium 234, and thus after the second conductive medium 234 is welded to the pressure sensitive chip 40 or the thermistor 50, the pressure sensitive chip 40 or the thermistor 50 is connected to the PCB 30, and a pressure signal or a temperature signal can be transmitted to the PCB 30. In order to fix the first conductive medium 232 more stably, the other end of the first conductive medium 232 is also soldered to a corresponding position of the PCB 30 through solder after passing through the PCB 30, and the PCB 30 is correspondingly provided with a through hole for the first conductive medium 232 to pass through, so that the contact area between the first conductive medium 232 and the circuit board can be increased.

In order to better fix the first conductive medium 232 to facilitate the assembly of the first conductive medium 232, the first conductive medium 232 is fixedly arranged on a substrate 15 in a penetrating manner, the substrate 15 is connected between the PCB 30 and the first ceramic board 21, so that the length of the two ends of the first conductive medium 232 protruding out of the substrate 15 is fixed, adjustment is not needed during the assembly, the two ends of the first conductive medium 232 directly penetrate through the first through hole 231 and the PCB 30 respectively, and then welding is performed.

In addition, referring to fig. 6, a first mounting groove 111 having a notch leading to the mounting space 11 and a second mounting groove 112 disposed at the bottom of the first mounting groove 111 are disposed at a connection position of the mounting space 11 and the medium channel 12, and the medium channel 12 is communicated with the bottom of the second mounting groove 112. Referring to fig. 2 and 3, the substrate 15 is mounted in the first mounting groove 111, and the ceramic circuit board 20 is received in the second mounting groove 112. In a specific implementation, the substrate 15 may be welded to the first mounting groove 111 by a laser welding process, so that the substrate 15 is hermetically connected to the housing 10, and the PCB 30 may be adhesively fixed on the inner surface of the housing 10.

In order to fill the first potting adhesive 14, the diameter of the second ceramic board 22 is smaller than that of the medium channel 12, so that the first potting adhesive 14 can be filled into the second mounting groove 112 from the medium channel 12 after the PCB 30, the substrate 15 and the PCB 30 are integrally mounted in the housing 10.

One end of the plug 60 is welded to a corresponding position of the PCB 30 so that the plug 60 is electrically connected to the PCB 30, and the other end of the plug 60 is led out from the opening 13, wherein the plug 60 is used for outputting a pressure signal and a temperature signal. In this embodiment, the plug 60 is a plurality of probes, and in some alternative embodiments, the plug 60 may also be a plug, a signal output terminal (e.g., a 2.54-4P terminal), a spring, a pogo pin, or the like. In order to protect the PCB 30 and the solder joints between the connector 60 and the PCB 30, the mounting space 11 is filled with a second potting adhesive 16.

The pressure sensitive chip 40 and the thermistor 50 are disposed on the second ceramic board 22 and located in the medium channel 12, the pressure sensitive chip 40 and the thermistor 50 are electrically connected to the PCB circuit board 30 through at least one conductive structure 23, and the pressure sensitive chip 40 and the thermistor 50 are electrically connected to the corresponding second conductive medium 234, respectively. Specifically, the pressure sensitive chip 40 and the thermistor 50 are flip-chip bonded to the surface of the second ceramic board 22 facing the inlet of the medium passage 12 by using a flip-chip bonding technique, and the pressure sensitive chip 40 and the thermistor 50 are bonded to various second conductive media 234, which is advantageous in that: on one hand, the flip-chip bonding technology has many excellent packaging characteristics such as short interconnection, small area, three-dimensional channel, high mounting density and the like, and can realize miniaturized packaging, on the other hand, the pressure sensitive chip 40 and the thermistor 50 are arranged just opposite to the inlet of the medium channel 12, so that the pressure sensitive chip 40 and the thermistor 50 can bear medium pressure on the front side, lateral extrusion force cannot be received, the sensor is not easy to fall off after welding, and the service life of the sensor is prolonged. Among them, the flip Chip bonding technology is derived from IBM C4 technology (Controlled cold Chip Connection), which is an advanced packaging technology for directly interconnecting a Chip and a substrate. In the packaging process, the bonding points on the chip are mutually connected with the bonding points of the substrate through the metal conductors in a mode that the front surface of the chip faces downwards.

In addition, in order to protect the solder joints of the pressure sensitive chip 40 and the thermistor 50 and the ceramic circuit board 20, the protective glue 17 is filled between the pressure sensitive chip 40 and the thermistor 50 and the second ceramic board 22, that is, the protective glue is filled at the bottom of the peripheries of the pressure sensitive chip 40 and the thermistor 50.

In summary, the sensor in the present embodiment integrates the pressure sensitive chip 40 and the thermistor 50, and designs the ceramic circuit board 20 capable of independently transmitting the sensing signals of the pressure sensitive chip 40 and the thermistor 50 at the same time, so as to simultaneously sense a plurality of parameters of pressure and temperature, and in addition, the pressure sensitive chip 40, the thermistor 50 and the required conductive structure 23 are integrated on the same ceramic circuit board 20, so that the size is small, and the product has the advantage of miniaturization.

Another aspect of the present invention further provides a method for manufacturing a sensor, please refer to fig. 7, which shows a method for manufacturing a sensor according to a second embodiment of the present invention, which can be used for manufacturing a sensor according to the first embodiment, the method specifically includes steps S01-S08:

step S01, preparing a ceramic circuit board;

step S02, soldering one end of a first conductive medium to a first ceramic board of the ceramic circuit board after passing through a first through hole of the ceramic circuit board;

step S03, respectively printing solder paste on the end faces of the second through holes of the ceramic circuit board so as to enable the solder paste to be connected with the second conductive media in the corresponding second through holes;

step S04, flip-chip bonding the pressure sensitive chip and the thermistor on the soldering paste at corresponding positions, and flip-chip bonding through a reflow oven;

step S05, filling protective glue between the pressure sensitive chip and the thermistor as well as between the second ceramic plate to obtain a whole package;

step S06, the whole package is arranged in the installation space of the shell, and the whole package and the shell are welded and fixed through a laser welding process;

step S07, a PCB is arranged in the installation space, the other end of the first conductive medium penetrates through the PCB and then is welded on the PCB, and first pouring sealant is filled in a second installation groove of the installation space;

and step S08, welding the plug connector to the corresponding position of the PCB, and filling a second pouring sealant in the installation space.

In some alternative embodiments, the step of preparing the ceramic circuit board (i.e., step S01) may be embodied as the following detailed steps, which specifically include steps S011 to S013:

step S011, forming the first through hole in the first ceramic plate, and printing a conductive trace on the first ceramic plate, wherein one end of the conductive trace extends into the first through hole during printing;

step S012, forming the second through hole in the second ceramic board, and filling the second through hole with the second conductive medium;

and S013, sintering the first ceramic plate and the second ceramic plate into an integral ceramic circuit board, wherein the second conductive medium is connected with the other end of the conductive circuit during sintering.

In summary, the method for manufacturing the sensor in this embodiment integrates the pressure sensitive chip and the thermistor, and manufactures the ceramic circuit board capable of independently transmitting the sensing signals of the pressure sensitive chip and the thermistor at the same time, so that the manufactured sensor can simultaneously sense a plurality of parameters of pressure and temperature, and in addition, the pressure sensitive chip, the thermistor and the required conductive structure thereof are integrated on the same ceramic circuit board, so that the size is small, and the product has the advantage of miniaturization.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A sensor, characterized in that the sensor comprises:

2. The sensor of claim 1, wherein one end of the first conductive medium is soldered to the first ceramic board after passing through the first through hole, and the other end of the first conductive medium is soldered to the PCB board after passing through the PCB board.

3. A sensor according to claim 1 or 2, wherein the first conductive medium is fixedly disposed through a substrate, the substrate being connected between the PCB circuit board and the first ceramic board.

4. The sensor of claim 3, wherein a first potting adhesive is filled between the second ceramic board and the inner wall of the housing, and the first potting adhesive covers the first through hole and a portion of the conductive line exposed on the surface of the first ceramic board.

5. The sensor of claim 1, wherein the mounting space is filled with a second potting adhesive.

6. The sensor of claim 1, wherein said pressure sensitive chip and said thermistor are flip-chip bonded to a surface of said second ceramic plate facing an inlet of said media channel.

7. The sensor of claim 6, wherein a protective glue is filled between the pressure sensitive chip and the thermistor and the second ceramic board.

8. The sensor of claim 4, wherein a first mounting groove with a notch leading to the mounting space and a second mounting groove arranged at the bottom of the first mounting groove are formed at the joint of the mounting space and the medium channel, the medium channel is communicated with the bottom of the second mounting groove, the substrate is mounted in the first mounting groove, the ceramic circuit board is accommodated in the second mounting groove, the diameter of the second ceramic board is smaller than that of the medium channel, and the first potting adhesive is filled in the second mounting groove.

9. The sensor of claim 1, wherein an opening is provided at an end of the housing remote from the media path, the sensor further comprising a connector electrically connected to the PCB and extending out of the opening.