WO2022252125A1

WO2022252125A1 - Input socket module for pen probe and multimeter

Info

Publication number: WO2022252125A1
Application number: PCT/CN2021/097759
Authority: WO
Inventors: 钟孝条; 吕成亮
Original assignee: 深圳市华盛昌科技实业股份有限公司
Priority date: 2021-06-01
Filing date: 2021-06-01
Publication date: 2022-12-08

Abstract

The present application discloses an input socket module for a pen probe and a multimeter. The input socket module comprises a socket housing (100), an input column (200), and a photoelectric sensor (300). The photoelectric sensor (300) comprises a light source (310) and a receiving sensing portion (320). Light emitted by the light source (310) enters a first mounting hole (211); if a pen probe (20) is inserted into the first mounting hole (211), the light encounters the pen probe (20) to form reflected light, and then the reflected light reaches the receiving sensing portion (320) through a first through portion (212), so as to acquire information about whether the pen probe (20) is located in the first mounting hole (211).

Description

Input socket module and multimeter for test leads

technical field

The application relates to the technical field of measuring instruments, in particular to an input socket module and a multimeter for test leads.

Background technique

The statements herein merely provide background information related to the present application and may not necessarily constitute prior art.

A multimeter is a magnetoelectric instrument used to measure one or more electrical parameters of AC current, DC current, voltage, resistance, audio level, capacitance, inductance, some parameters of semiconductors (such as β), etc. , Also known as multi-purpose meter, multi-purpose meter, three-purpose meter, multi-purpose meter, multi-purpose meter, etc.

Multimeters are divided into pointer multimeters and digital multimeters according to the display mode.

Generally, a multimeter includes components such as a meter head, a measuring circuit, a rotary switch, and a display. Measuring circuit, rotary switch and display are all installed on the meter head. The measurement circuit is a circuit used to convert various measured electrical parameters into a small DC current suitable for meter measurement. It is generally composed of resistors, semiconductor components and batteries. The rotary switch is used to select various measurement circuits to meet the measurement requirements of different types and ranges. The meter head is provided with a plurality of input jacks and input columns installed in the input jacks, and the input columns are electrically connected with the measuring circuit through test leads. The display provides readouts of electrical parameters.

When the rotary switch selects the measuring circuit for measuring a certain electrical parameter, the test lead is inserted into the corresponding input jack and electrically connected to the input column, thereby electrically connecting with the measuring circuit, and then the measuring circuit is connected to the test lead through the test lead. The object is electrically connected, and the electrical parameters of the object under test are measured, and the measurement results are displayed on the display.

In actual use, the user needs to manually check whether the test lead has been inserted into the correct input jack. For example, the user uses the rotary switch to select the voltage measurement gear, but the test lead is inserted into the input jack of the measurement battery by mistake, which will cause a short circuit in the measurement circuit and burn the multimeter. In the related technology known by the inventor, a photon emitter and a photon detector are respectively arranged on both sides of each input jack of the multimeter, and whether the optical path is interrupted, so as to obtain the information of whether the meter pen is located in the input jack, the detection means Complexity, high cost, and large space occupation of the structure. Therefore, it is necessary to provide a new and simple detection means for identifying whether the test lead is located in the input jack, that is, to simply obtain information on whether the test lead is located in the input jack.

technical problem

One of the objectives of the embodiments of the present application is to provide an input socket module and a multimeter for test leads.

technical solution

The technical scheme that the embodiment of the present application adopts is:

In the first aspect, an input socket module for test leads is provided, including:

socket housing;

The input column includes an insulating sleeve and a conductive part, the insulating sleeve is installed on the socket shell, the inside of the insulating sleeve has a first installation hole for inserting a test lead, and the conductive part is installed in the first installation hole Inside, the hole wall of the first installation hole has a first through portion;

The photoelectric sensor is installed on the socket shell, the photoelectric sensor includes a light source and a receiving sensing part, the light emitted by the light emitting source enters the first installation hole after passing through the first through part, and the receiving sensing part The part is used for receiving reflected light from the first installation hole to determine whether the test lead is inserted into the first installation hole.

In a second aspect, a multimeter is provided, including at least one input socket module for test leads described in any one of the above items.

Beneficial effect

The beneficial effect of the input socket module for test leads provided by the embodiment of the present application is that: the light emitted by the light source of the photoelectric sensor enters the first installation hole through the first through part. If the test lead is inserted in the first installation hole, The light meets the test lead to form reflected light, and then reaches the receiving and sensing part through the first passing part, so as to obtain the information whether the test lead is located in the first installation hole according to the reflected light signal.

The beneficial effect of the multimeter provided by the embodiment of the present application is that the multimeter adopts an input socket module for test leads, and can identify whether the test leads are located in the first installation hole.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments or exemplary technical descriptions. Obviously, the accompanying drawings in the following descriptions are only for this application. For some embodiments, those skilled in the art can also obtain other drawings based on these drawings without creative efforts.

Fig. 1 is the structural representation of the multimeter with four input that the embodiment of the application provides;

Fig. 2 is the structural representation of the multimeter with three inputs that the embodiment of the application provides;

Fig. 3 is a partial cross-sectional view of the assembly relationship of an input socket module for test leads provided by the present application on a multimeter;

Figure 4 is an exploded view of Figure 3;

Fig. 5 is a sectional view of the use and assembly relationship of the multimeter and test leads in Fig. 3;

Fig. 6 is the schematic structural view of the photoelectric sensor of the input socket module used for test leads in Fig. 3;

FIG. 7 is a schematic structural view of the first light guide of the input socket module used for test leads in FIG. 3;

8 is a cross-sectional view of the first light guide in FIG. 7;

FIG. 9 is a schematic structural view of the input column of the input socket module for test leads provided by the present application;

FIG. 10 is another structural schematic diagram of the input column of the input socket module for the test pen provided by the present application;

Fig. 11 is a schematic structural diagram of another input socket module for test leads provided in the embodiment of the present application;

Fig. 12 is a cross-sectional view of the input socket module for test leads in Fig. 11;

Fig. 13 is a cross-sectional view of the optical path of the input socket module for test leads in Fig. 12;

Fig. 14 is an exploded view of the input socket module for test leads in Fig. 11;

Fig. 15 is another perspective view of the input socket module for test leads in Fig. 14;

Fig. 16 is a cross-sectional view of the use and assembly relationship between the input socket module for the test leads and the test leads in Fig. 11;

Figure 17 is an exploded view of Figure 16;

Fig. 18 is a schematic structural view of the input column of the input socket module for the test pen in Fig. 11;

Fig. 19 is a sectional view of the input column in Fig. 18;

Fig. 20 is a partial sectional view of the assembly relationship of the input socket module for test leads in Fig. 11 on the multimeter;

Fig. 21 is a schematic diagram of a connection relationship of the input socket module for the test leads in Fig. 11 on the face shell of the multimeter;

FIG. 22 is a schematic diagram of another connection relationship of the input socket module for test leads in FIG. 11 on the face shell of the multimeter.

Embodiments of the present invention

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present application.

It should be noted that when a component is referred to as being “fixed on” or “disposed on” another component, it may be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are for convenience of description only, rather than indicating or implying the referred device Or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the application, and those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations. The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of technical features. "Plurality" means two or more, unless otherwise clearly and specifically defined.

In order to illustrate the technical solutions provided by the present application, detailed descriptions will be given below in conjunction with specific drawings and embodiments.

Please refer to FIG. 1 and FIG. 2 , some embodiments of the present application provide a multimeter 10 , including at least one input socket module for a test lead 20 according to any one of the following items.

Wherein, please refer to FIG. 3 and FIG. 20 , the input socket module for the test lead 20 in this embodiment includes a socket housing 100 , an input column 200 and a photoelectric sensor 300 .

Referring to Figure 4, Figure 11 and Figure 12, the input column 200 includes an insulating sleeve 210 and a conductive member 220, the insulating sleeve 210 is installed on the socket housing 100, and the inside of the insulating sleeve 210 has a first installation hole 211 for inserting the test lead 20, which is conductive The component 220 is installed in the first installation hole 211 , and the hole wall of the first installation hole 211 has a first through portion 212 . The first through portion 212 is transparent so that light can pass through.

5, 6 and 13, the photoelectric sensor 300 is installed on the socket housing 100, the photoelectric sensor 300 includes a light source 310 and a receiving sensing part 320, and the light emitted by the light source 310 enters the first installation part 212 after passing through the first pass part 212. In the hole 211 , the receiving sensing part 320 is used to receive the reflected light from the first installation hole 211 to determine whether the test lead 20 is inserted into the first installation hole 211 .

In this embodiment, the light emitted by the light source 310 of the photoelectric sensor 300 enters the first installation hole 211 through the first through portion 212, and if the test lead 20 is inserted in the first installation hole 211, the light meets the test lead 20 to form reflected light , and then return to the receiving sensing part 320 through the first pass part 212, so the input socket module for the test lead 20 obtains whether the test lead 20 is located in the first installation hole 211 according to the reflected light signal received by the receiving sensing part 320 The information provides a novel, stable and simple detection method for identifying whether the test lead 20 is located in the first installation hole 211, which improves the safety of the instrument.

It should be noted that the receiving and sensing part 320 of the photoelectric sensor 300 can convert the light signal of the reflected light into an electronic signal, and the electronic signal is processed to inform the user of the detection result. The processing of the electronic signal can be performed by the sensor circuit board of the photoelectric sensor 300 The circuit provided by 330 can also be uploaded to the main circuit board 17 of the multimeter 10, and the circuit provided by the main circuit board 17 can perform the test and inform the user of the test result. For example, the multimeter 10 also includes an alarm electrically connected to the main circuit board 17, and the alarm can display the detection result of the input socket module. The alarm can be selected as a buzzer or a signal light.

Wherein, the hole wall of the first installation hole 211 includes the side wall of the first installation hole 211 and the bottom wall of the first installation hole 211, so that the first through part 212 can be located at the side wall of the first installation hole 211, and can also be located at the first installation hole 211. A bottom wall of the mounting hole 211 .

Wherein, the reflected light signal includes whether the reflected light is present or not, and also includes the reflective surface environment (reflecting distance and angle) of the reflected light.

For example, please refer to FIG. 13 , the first through portion 212 is located on the side wall of the first installation hole 211, the photoelectric sensor 300 is located on the side of the input column 200, and when the test lead 20 is not inserted in the first installation hole 211, the light meets the first installation hole 211. The wall on the other side of a mounting hole 211 is reflected back, and when the test lead 20 is inserted in the first mounting hole 211, the light enters the first mounting hole 211 and immediately encounters the test lead 20 and is reflected back. The reflection distance of the reflected light, When the reflection position or reflection angle changes, resulting in a change in the reflected light signal, the receiving sensing part 320 can determine whether the test lead 20 is inserted into the first installation hole 211 .

For another example, please refer to FIG. 5 , the first through portion 212 is located at the bottom wall of the first installation hole 211 , and the photoelectric sensor 300 is located at the bottom of the input column 200 . The receiving sensing part 320 does not receive the reflected light, indicating that the light does not encounter the test lead 20 , and then it is determined that the test lead 20 is not inserted into the first installation hole 211 .

Compared with the solution in which the photoelectric sensor 300 is located at the side of the input column 200, the solution in which the photoelectric sensor 300 is located at the bottom of the input column 200, the photoelectric sensor 300 can judge whether the test lead 20 is inserted into the first installation hole 211 according to the presence or absence of reflected light, without Analyzing the reflective surface environment of reflected light greatly reduces the difficulty of detection. Moreover, since the longitudinal dimension of the first installation hole 211 is larger than the transverse dimension of the first installation hole 211, the photoelectric sensor 300 can easily identify whether there is a test lead 20 on the longitudinal dimension of the first installation hole 211, and the detection accuracy is high. In addition, in the solution where the photoelectric sensor 300 is located at the bottom of the input column 200 , the light source 310 does not need to align with the first through portion 212 and the reflective surface 213 (see FIG. 19 ), and there is no specific requirement on the power of the light source 310 .

Wherein, the light source 310 of the photoelectric sensor 300 may be an emitting light emitting diode, and the receiving sensing part 320 of the photoelectric sensor 300 may be a photodiode, a phototransistor, a photoresistor or a photoelectric thyristor, or a photoelectric receiving Darlington.

In this embodiment, please refer to FIG. 6 and FIG. 15. The integrated design of the photoelectric sensor 300 integrates the luminescent light source 310 and the receiving sensing part 320. It occupies a small space and is convenient for direct or indirect installation on the socket housing 100. The volume of the input socket module used for the test lead 20 is small and compact.

In this embodiment, the input socket module used for the test leads 20 has a modular design feature, can be applied to various multimeters 10, has strong versatility, can reduce mold costs, and mass production is beneficial to reduce product costs.

In some embodiments, please refer to FIG. 4 , the multimeter 10 includes a detachably connected face case 11 and a bottom case 12 , and the above-mentioned input socket module for the test leads 20 is installed on the face case 11 . The first installation hole 211 of the input column 200 communicates with the outside of the face shell 11 , so that the test lead 20 can be inserted into the first installation hole 211 and electrically connected with the conductive member 220 located in the first installation hole 211 .

Optionally, please refer to FIG. 4 and FIG. 21 , the above-mentioned multimeter 10 further includes a battery 16 and a main circuit board 17 installed between the front case 11 and the bottom case 12 . The battery 16 , the photoelectric sensor 300 and the conductive element 220 are respectively electrically connected to the main circuit board 17 . The battery 16 is used to provide electric energy for the components in the multimeter 10 . The photoelectric sensor 300 can transmit the electronic signal of whether the test lead 20 is located in the first installation hole 211 to the main circuit board 17 . The test leads 20 are inserted into the first installation hole 211 and electrically connected to the main circuit board 17 through the conductive member 220 , so as to measure corresponding electrical parameters by means of the measuring circuit of the main circuit board 17 .

Specifically, please refer to FIG. 4 , the photoelectric sensor 300 further includes a sensor circuit board 330 , and the sensor circuit board 330 is electrically connected to the main circuit board 17 .

Specifically, referring to FIG. 1 and FIG. 2 , the multimeter 10 further includes at least one of a knob 13 , a key 14 and a display window 15 installed on the face case 11 . The knob 13 is electrically connected to the main circuit board 17 , so that the user can select a measurement circuit of different electrical parameters by rotating the knob 13 . The button 14 is electrically connected to the main circuit board 17, and the button 14 includes at least one of a switch button, a mode button, a range button, a data hold button and a relative value button. The display window 15 is used to display the readings of electrical parameters.

It should be noted that, in addition to being applied to the multimeter 10, the above-mentioned input socket module for the test leads 20 can also be applied to other control devices that can be plugged with the test leads 20. The input column 200 provides a first installation hole 211 for the test leads 20 and control devices. The devices are electrically connected, and the photoelectric sensor 300 can detect whether the test lead 20 is inserted into the corresponding first installation hole 211 .

In some embodiments, please refer to FIG. 4, FIG. 5 and FIG. 13, the socket housing 100 has a second mounting hole 110, the insulating sleeve 210 is installed in the second mounting hole 110, and the hole wall of the second mounting hole 110 has a position and The position of the first through portion 212 corresponds to that of the second through portion 120 . Wherein, the second through portion 120 is transparent and will not block the light emitted by the light source 310 from reaching the first through portion 212 and entering into the first installation hole 211 . The second through portion 120 can be used for passing light, and can also be used for installing the insulating cover 210 or installing the second light guide 410 described below. The photosensor 300 is located outside the second installation hole 110 . The second installation hole 110 is used for installation and protection of the input column 200 .

In addition, the photoelectric sensor 300 is installed on the outer wall of the socket housing 100, and has a distance from the input column 200, thereby separating the weak current of the photoelectric sensor 300 from the strong current of the conductive member 220, preventing the photoelectric sensor 300 from being broken down by the strong current, and protecting Function of the photoelectric sensor 300 . The light emitted by the light source 310 enters the first installation hole 211 after passing through the first through part 212. If the first installation hole 211 has a test lead 20, the light is reflected by the test lead 20, and then reaches the receiving sensor through the first through part 212. Section 320.

Optionally, the socket housing 100 is an opaque plastic housing.

Specifically, please refer to FIG. 5 , FIG. 16 and FIG. 17 , there is a gap between the outer wall of the insulating sleeve 210 and the hole wall of the second installation hole 110 . The test lead 20 includes a test lead plug 21, the end of the test lead plug 21 has a plug insulating layer 22 and a conductive plug 23 located in the plug insulating layer 22, and the plug insulating layer 22 is inserted into the outer wall of the insulating sleeve 210 and the hole of the second mounting hole 110 In the gap between the walls, the conductive plug 23 is inserted into the first installation hole 211 and electrically connected with the conductive member 220 .

In some embodiments, please refer to FIG. 4 and FIG. 5 , the first through portion 212 is the first through hole 214 at the bottom of the first mounting hole 211 , and the second through portion 120 is the second through hole 214 at the bottom of the second mounting hole 110 . Through the through hole 123 , the insulating sleeve 210 is inserted into the second installation hole 110 through the second through hole 123 .

Wherein, the arrow located in the first installation hole 211 in FIG. 5 indicates the moving direction of the light. Please refer to FIG. 5 , the photoelectric sensor 300 is installed at the bottom of the first installation hole 211, the light emitted by the light source 310 enters the first installation hole 211 through the first through hole 214, and if there is a test lead 20, the receiving sensor 320 receives the light. reflected light (see the direction of the arrow in the first installation hole 211 on the right side in FIG. The direction of the arrow in the first installation hole 211 on the left side), so that the above-mentioned input socket module for the test lead 20 can judge whether the test lead 20 is inserted in the first installation hole 211 according to whether the receiving sensor 320 receives reflected light .

Specifically, please refer to FIG. 4, FIG. 7 and FIG. 8, the input socket module for the test lead 20 also includes a first light guide 420, one side of the first light guide 420 has a The first light guide column 421 in the hole 214 and the photoelectric sensor 300 are installed on the other side of the first light guide member 420 .

The photoelectric sensor 300 is installed on the socket housing 100 through the first light guide 420 . The light emitted by the light source 310 enters the first installation hole 211 through the first light guide rod 421 . The first light guide element 420 is installed into the input column 200 through the first light guide column 421 .

In addition, the edge of the first light guide 420 can optionally be inserted into the socket housing 100 to improve connection strength. The first light guide 420 can increase the safety distance between the photoelectric sensor 300 and the conductive member 220 to protect the photoelectric sensor 300 .

Optionally, the first light guide 420 is made of transparent material.

Optionally, the first light guide member 420 is an insulating member, further separating the strong electricity of the conductive member 220 from the photoelectric sensor 300 .

Specifically, referring to FIG. 4 and FIG. 7 , each first light guide member 420 is configured with a plurality of first light guide columns 421 . A number here refers to one or more than one, such as one, two, three, four, and so on. One end of the first light guide rod 421 is inserted into the first through hole 214 , and the photoelectric sensor 300 is mounted on the other end of the first light guide rod 421 .

For example, referring to FIG. 4 and FIG. 6 , one first light guide 420 is provided with two first light guide columns 421 , so that one first light guide 420 can realize installation and protection of two photoelectric sensors 300 . When the number of the first installation holes 211 is four, the installation and protection of four photoelectric sensors 300 can be realized by using two first light guide members 420 .

Specifically, please refer to FIG. 4 , a first sealing ring 430 is disposed between the first light guide column 421 and the wall of the first through hole 214 . The first sealing ring 430 plays a waterproof role, preventing water droplets entering the first mounting hole 211 from flowing along the wall of the first through hole 214 toward the photoelectric sensor 300 , and preventing water from entering the multimeter 10 .

Further, please refer to FIG. 7 and FIG. 8 , the outer wall of the first light guide column 421 has a first mounting portion 422 for receiving the first sealing ring 430 , so as to facilitate the installation and positioning of the first sealing ring 430 .

Optionally, the first installation part 422 is a first installation groove or a first installation step.

Specifically, please refer to FIG. 4 , a second sealing ring 440 is provided between the outer wall of the insulating sleeve 210 and the hole wall of the second installation hole 110 . The second sealing ring 440 plays a role of waterproofing, preventing the water droplets entering the second mounting hole 110 from flowing along the wall of the second through hole 123 towards the photoelectric sensor 300 , and preventing water from entering the multimeter 10 .

FIG. 9 is a schematic structural view of the input column 200 of the output socket module for test leads provided by the present application, wherein (a) of FIG. 9 is the external structure diagram of the input column 200, and (b) of FIG. 9 is the input As a cross-sectional view of the column 200 , FIG. 9( c ) is a structural schematic diagram of the conductive member 220 of the input column 200 .

Fig. 10 is another schematic structural view of the input column 200 of the output socket module for test leads provided by the present application, wherein (a) of Fig. 10 is an external structural diagram of the input column 200, and (b) of Fig. 10 is A cross-sectional view of the input column 200 , FIG. 10 ( c ) is a schematic structural view of the conductive member 220 of the input column 200 .

Further, please refer to FIG. 9 and FIG. 10 , the outer wall of the insulating sleeve 210 has a second mounting portion 215 for receiving the second sealing ring 440 .

Optionally, the second installation portion 215 is a second installation groove or a second installation step.

On the basis of the foregoing embodiments, please refer to FIG. 9 and FIG. 10 , the insulating sleeve 210 has a positioning hole 216 for installing and positioning the conductive member 220 to ensure the connection reliability between the conductive member 220 and the insulating sleeve 210 .

On the basis of the foregoing embodiments, please refer to FIG. 9 and FIG. 10 , the insulating sleeve 210 is integrally injection-molded on the conductive member 220 , and the input column 200 has a strong integrity, which is beneficial to improve the connection reliability between the input column 200 and the test lead 20 .

On the basis of the foregoing embodiments, the conductive member 220 is a conductive sheet.

Optionally, please refer to (c) of FIG. 9 , the conductive sheet is a circular conductive sheet.

Optionally, referring to FIG. 10 , the conductive sheet includes two semicircular conductive sheets.

In some other embodiments, please refer to FIG. 11 to FIG. 15 , the input socket module for the test lead 20 further includes a second light guide 410 , one end of the second light guide 410 is installed on the outer wall of the socket housing 100 , The photoelectric sensor 300 is mounted on the other end of the second light guide 410 . The second light guide 410 increases the safety distance between the weak electric photoelectric sensor 300 and the strong electric conductive element 220 , thereby protecting the photoelectric sensor 300 .

Optionally, the second light guiding element 410 is an insulating element.

Optionally, the second light guide member 410 is made of light-transmitting material.

Specifically, please refer to FIG. 14 and FIG. 15, the second light guide member 410 includes a second light guide column 411 and a third light guide column 412, the position of the second light guide column 411 corresponds to the position of the light source 310, and the third light guide column The position of 412 corresponds to the position of the receiving sensing part 320, and the second through part 120 includes a first light through hole 121 for installing the second light guide bar 411 and a second light through hole 122 for installing the third light guide bar 412 . The second light guide rod 411 and the third light guide rod 412 guide the optical path of the photoelectric sensor 300 .

Optionally, both the second light guide column 411 and the third light guide column 412 have through holes, so as to facilitate the passage of light. It can be understood that the second light guide column 411 and the third light guide column 412 may also be light-transmitting solid columns, and light can also pass through the light-transmitting solid columns smoothly.

In this embodiment, in addition to the first light hole 121 and the second light hole 122 , the second through portion 120 can also be a light-transmitting plate, and light can also pass through the light-transmitting plate smoothly.

Specifically, please refer to FIG. 18 and FIG. 19 , the position of the first through portion 212 corresponds to the position of the second light guide 410 , and the hole wall of the first installation hole 211 also has a reflector opposite to the position of the first through portion 212 . Surface 213. When the test lead 20 is not inserted into the first installation hole 211 , the light emitted by the light source 310 is reflected back to the receiving and sensing portion 320 through the reflecting surface 213 . When the test lead 20 is inserted into the first installation hole 211, the light emitted by the light source 310 does not reach the reflective surface 213, but is reflected back to the receiving sensing part 320 through the plug insulating layer 22 and the conductive plug 23 of the test lead plug 21. The reflection environment changes—including the reflection distance, reflection position or reflection angle, thereby changing the reflected light signal, so that the receiving sensing part 320 can obtain the information of whether the test pen 20 is inserted into the input column 200 according to the reflected light signal, and make a positive response , convert the optical signal into an electronic signal, and upload it to the main circuit board 17 of the multimeter 10 for signal processing, so as to inform the user of the detection result.

On the basis of the foregoing embodiments, the first through portion 212 is a through hole or a light-transmitting plate.

On the basis of the foregoing embodiments, an input socket module for the test lead 20 proposed by the present application can be installed on the face case 11 of the multimeter 10 in various ways.

For example, at least one of the socket housing 100 , the photoelectric sensor 300 and the input column 200 is detachably mounted on the face shell 11 of the multimeter 10 .

Specifically, the lower end of the conductive member 220 is detachably connected to the face shell 11 .

Please refer to FIG. 21 , the lower end of the conductive member 220 has an external thread, the multimeter 10 also includes a fastener 18 and a connecting piece 19 , one end of the connecting piece 19 is connected to the face shell 11 , and the other end of the connecting piece 19 has a socket conductive member 220 The threaded end of the hole, the fastener 18 is threadedly connected to the threaded end of the conductive member 220, so as to clamp and fix the connecting piece 19.

For another example, at least one of the socket shell 100 , the photoelectric sensor 300 and the input column 200 is welded and fixed to the face shell 11 of the multimeter 10 .

Specifically, the socket shell 100 is welded on the face shell 11 .

Please refer to FIG. 22 , the top of the socket housing 100 is fixed on the face shell 11 by ultrasonic welding.

For another example, at least one of the socket housing 100 , the photoelectric sensor 300 and the input post 200 is injection-molded on the face shell 11 of the multimeter 10 .

Specifically, please refer to FIG. 4 and FIG. 5 , the socket housing 100 and the face shell 11 are integrally injection molded by mold injection.

The above are only optional embodiments of the application, and are not intended to limit the application. For those skilled in the art, various modifications and changes may occur in this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of the claims of the present application.

Claims

An input socket module for test leads, characterized in that it comprises:

socket housing;

The input column includes an insulating sleeve and a conductive part, the insulating sleeve is installed on the socket shell, the inside of the insulating sleeve has a first installation hole for inserting a test lead, and the conductive part is installed in the first installation hole Inside, the hole wall of the first installation hole has a first through portion;

The photoelectric sensor is installed on the socket shell, the photoelectric sensor includes a light source and a receiving sensing part, the light emitted by the light emitting source enters the first installation hole after passing through the first through part, and the receiving sensing part The part is used for receiving reflected light from the first installation hole to determine whether the test lead is inserted into the first installation hole.
The input socket module for test leads according to claim 1, wherein the socket shell has a second mounting hole, the insulating sleeve is mounted in the second mounting hole, and the second mounting hole The wall of the hole has a second through portion corresponding to the position of the first through portion, and the photoelectric sensor is located outside the second mounting hole.
The input socket module for test leads according to claim 2, wherein the first through part is a first through hole located at the bottom of the first mounting hole, and the second through part is located at the bottom of the first installation hole. The second through hole at the bottom of the second installation hole, the insulating sleeve is inserted into the second installation hole through the second through hole.
The input socket module for test leads according to claim 3, characterized in that: the input socket module for test leads also includes a first light guide, one side of the first light guide has a The photoelectric sensor is installed on the other side of the first light guide member on the first light guide column inserted in the first through hole.
The input socket module for test leads according to claim 4, characterized in that: each of the first light guide members is equipped with a plurality of the first light guide columns.
The input socket module for test leads according to claim 4, wherein a first sealing ring is provided between the first light guide column and the wall of the first through hole.
The input socket module for test leads according to claim 6, characterized in that: the outer wall of the first light guide column has a first mounting portion for accommodating the first sealing ring.
The input socket module for test leads according to claim 4, wherein the first light guiding member is an insulating member.
The input socket module for test leads according to claim 3, wherein a second sealing ring is provided between the outer wall of the insulating sleeve and the hole wall of the second installation hole.
The input socket module for test leads according to claim 2, characterized in that: the input socket module for test leads also includes a second light guide, one end of the second light guide is installed on the The outer wall of the socket housing, the photoelectric sensor is mounted on the other end of the second light guide.
The input socket module for test leads according to claim 10, characterized in that: the second light guide member includes the second light guide column whose position corresponds to the position of the light emitting light source and the position corresponding to the position of the The third light guide rod corresponding to the position of the receiving sensing part, the second through part includes a first light through hole for installing the second light guide rod and a second light through hole for installing the third light guide rod hole.
The input socket module for test leads according to claim 10, wherein the position of the first through part corresponds to the position of the second light guide, and the hole wall of the first mounting hole It also has a reflective surface opposite to the position of the first through portion.
The input socket module for test leads according to claim 1, wherein the insulating sleeve has a positioning hole for installing and positioning the conductive member.
The input socket module for test leads according to claim 1, wherein the insulating sleeve is integrally injection-molded on the conductive member.
The input socket module for test leads according to claim 1, wherein at least one of the socket shell, the photoelectric sensor and the input column is detachably mounted on the face shell of the multimeter.
The input socket module for test leads according to claim 1, characterized in that at least one of the socket shell, the photoelectric sensor and the input column is welded and fixed to the face shell of the multimeter.
The input socket module for test leads according to claim 1, wherein at least one of the socket shell, the photoelectric sensor and the input column is injection-molded on the face shell of the multimeter.
A multimeter, characterized in that it includes at least one input socket module for test leads according to any one of claims 1 to 17.