Patent Description:
With the evolution of science and technology, requirements for the accuracy of switch control in today's society are increasing day by day, so the development of switch devices is getting more attention. Conventional switch devices are usually connected with external resistors to improve signal discrimination. However, the space provided for assembly of a switch device is limited, implementation of an externally added resistor increases the required assembly space of the switch device, which is not conducive to installation. In addition, since conventional resistors are exposed outside the switch device, manufacturers need to add additional circuit boards for installing the resistors. At the same time, in order to ensure the operational stability of the resistors, designs for the resistors must be taken into consideration or other components must be added to protect the resistors.

In order to solve the aforementioned problems, resistors are disposed of in most of the existing switch devices, as disclosed in US Publication No. <CIT>, <CIT>, and corresponding patents such as <CIT>, <CIT> and <CIT>; further, <CIT>, and corresponding patent, <CIT>. The switch devices disclosed in the aforementioned patents are implemented with a metal lead frame, and the conductive pins of the switch devices are formed through the metal lead frame. At the same time, the metal lead frame and the resistor form at least two conductive paths. When the switch devices are operated, the operating member controls the movable contact point to conduct one of the two conductive paths, thereby changing the electrical signal output by the conductive pins. However, when manufacturing the switch devices in the conventional mechanism, the metal lead frame has to be additionally installed, resulting in complicated manufacturing steps, and the metal lead frame has to be positioned during the assembly process, which is not conducive to assembly.

A main object of the invention is to solve the problems of complicated manufacturing steps and not conducive to assembly caused by the use of a metal lead frame in the conventional switch devices.

In order to achieve the above object, the invention provides a micro switch comprising a casing, a circuit board, and a switching assembly. The casing is formed with a space. The circuit board is assembled with the casing, and the circuit board comprises a first side, a plurality of first printed circuits arranged on the first side, at least one first resistor disposed on the first side and forming a conductive relationship with two of the first plurality of printed circuits, and a trigger structure located on the first side, wherein a part of the first side at least partially faces the space, two of the plurality of first printed circuits extend out of the casing to be served as at least two first conductive pins of the micro switch, and at least two first electrical signals are generated from the at least two first conductive pins which are controlled by the plurality of first printed circuits, the first resistor, and the trigger structure, resistance values of the at least the two first electrical signals are different. The switching assembly comprises an elastic member located in the space, and an operating member connected with the elastic member and extending out of the casing for pressing, the operating member comprises a displacement stroke in the space, the operating member contacts the trigger structure while moving along the displacement stroke, and one of the two first electrical signals generated by the two first conductive pins being changed to an other one of the two first electrical signals.

In one embodiment, the trigger structure is is formed of at least one conductive elastic plate.

In one embodiment, the at least one conductive elastic plate comprises a fixed end mounted on the circuit board and electrically connected to one of the plurality of first printed circuits, and a free end opposite to the fixed end, the free end is contacted to contact another one of the plurality of first printed circuits when the operating member moves along the displacement stroke.

In one embodiment, the trigger structure is formed of at least two conductive elastic plates, and the operating member contacts at least one of the two conductive elastic plates before and after the moving along the displacement stroke, respectively.

In one embodiment, the circuit board comprises a second side opposite to the first side, a plurality of second printed circuits arranged on the second side, and at least one conductive through hole electrically connected to one of the plurality of first printed circuits with one of the second printed circuits, two of the plurality of second printed circuits extend out of the casing to be served as at least two second conductive pins of the micro switch, when the operating member contacts the trigger structure while moving along the displacement stroke, electrical signals generated by the two of the plurality of second conductive pins are changed.

In one embodiment, the circuit board comprises at least one second resistor disposed on the second side and electrically connected to the two of the plurality of second printed circuits.

In one embodiment, the casing comprises a cover forming the space and a base mounted in the cover for disposal of the circuit board, the base divides the space into a first part and a second part, the first part provides the operating member to move therein, and the second part is provided with the first resistor therein.

In one embodiment, the base comprises a slot formed on a side of the base for disposal of the circuit board.

In one embodiment, the base comprises at least one protruding rib formed in the slot to jointly restrain the circuit board.

In one embodiment, the cover comprises at least one stepped wall surrounding the space to limit a position of the base.

In one embodiment, the base comprises a positioning block located in the first part for positioning the elastic member.

Accordingly, comparing with the conventional technique, the invention has the following characteristics: the invention provides the circuit board, forms a conductive relationship with the first resistor and the trigger structure through the first printed circuits disposed on the circuit board, and utilizes the first printed circuits to form the first conductive pins. The invention no longer uses a metal lead frame to form the pins, and does not need to additionally dispose the metal lead frame and position the metal lead frame during the manufacturing process of the micro switch, which is conducive to improving production efficiency.

The detailed description and technical content of the invention are described below with reference to the accompanying drawings.

Please refer to <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG> and <FIG>, the invention provides a micro switch <NUM> comprising a casing <NUM>, a circuit board <NUM> and a switching assembly <NUM>. The casing <NUM> is formed with a space <NUM>. The circuit board <NUM> is assembled with the casing <NUM>, and the circuit board <NUM> comprises a first side <NUM>, a plurality of first printed circuits <NUM> arranged on the first side <NUM>, at least one first resistor <NUM> disposed on the first side <NUM>, and a trigger structure <NUM> located on the first side <NUM>. A part of the first side <NUM> at least partially faces the space <NUM>. Specifically, the first side <NUM> refers to one of side surfaces of the circuit board <NUM> that is provided for printing, the plurality of first printed circuits <NUM> are conductive patterns printed on an insulating substrate of the circuit board <NUM>, and the plurality of first printed circuits <NUM> are used to provide a conductive function for the circuit board <NUM>. In one embodiment, the plurality of first printed circuits <NUM> is formed of copper foil. The first resistor <NUM> is connected to two of the first printed circuits <NUM> and capable of forming a conductive relationship with the two of the plurality of first printed circuits <NUM>. In one embodiment, the first resistor <NUM> is fixed on the circuit board <NUM> by through-hole technology (THT), or surface-mount technology (SMT). The trigger structure <NUM> comprises a conductive function and is conducted with the plurality of first printed circuits <NUM>. The trigger structure <NUM> changes a working state thereof after being acted on, so that a conductive relationship with the plurality of first printed circuits <NUM> and the first resistor <NUM> can be determined. In one embodiment, the trigger structure <NUM> is formed of at least one conductive elastic plate <NUM>, and the working state of the trigger structure <NUM> described herein is that the at least one conductive elastic plate <NUM> is in contact with and conducted with the plurality of first printed circuits <NUM>, or is not in contact with and not conducted with the plurality of first printed circuits <NUM>.

Two of the plurality of first printed circuits <NUM> extend out of the casing <NUM> to be served as at least two first conductive pins <NUM>, <NUM> of the micro switch <NUM>, and the at least two first conductive pins <NUM>, <NUM> are provided for connecting with an external device (not shown in the figures), so that the external device can be controlled according to outputs of the at least two first conductive pins <NUM>, <NUM>. At least two first electrical signals are generated from the at least two first conductive pins <NUM>, <NUM> which are controlled by the plurality of first printed circuits <NUM>, the first resistor <NUM>, and the trigger structure <NUM>, and the resistance values of the at least two first electrical signals are changed based on a conductive relationship between the plurality of first printed circuits <NUM>, the first resistor <NUM> and the trigger structure <NUM>. It should be understood that the difference in resistance value described herein refers to a difference in resistance value measured at two nodes of an electrical circuit formed by the plurality of first printed circuits <NUM> at the time that before and after the micro switch <NUM> is actuated. For example, the micro switch <NUM> can be provided with a plurality of the first resistors <NUM>, different resistance values can be generated when the plurality of first resistors <NUM> are respectively conducted, or different resistance values can be generated by the plurality of first resistors <NUM> with different electrical circuits, or different resistance values can be generated before and after one of the plurality of first resistor <NUM> is conducted.

The switching assembly <NUM> comprises an elastic member <NUM> located in the space <NUM>, and an operating member <NUM> connected with the elastic member <NUM>. A portion of the operating member <NUM> is extended out of the casing <NUM> for pressing. The operating member <NUM> presses against the elastic member <NUM> after being pressed, so that the elastic member <NUM> provides a restoring force for the operating member <NUM> when the operating member <NUM> is released from being pressed. In addition, the operating member <NUM> has a displacement stroke <NUM> in the space <NUM> after being pressed. During the displacement stroke <NUM>, the operating member <NUM> contacts the trigger structure <NUM>, and one of the two first electrical signals generated by the at least two first conductive pins <NUM>, <NUM> being changed to the other one of the two first electrical signals.

Please refer to <FIG>, <FIG>, <FIG>, <FIG>, implementation of the micro switch <NUM> will be described hereinafter. For the convenience of describing and explaining the micro switch <NUM>, it is assumed that the at least two first conductive pins <NUM>, <NUM> are COM pin and NC pin, respectively, known by a person having ordinary skill in the art, the trigger structure <NUM> is a single conductive elastic plate <NUM>, and a quantity of the first resistor <NUM> is two. In order to distinguish two first resistors <NUM> herein, reference numerals of the two first resistors <NUM> are respectively distinguished as <NUM>, <NUM>, wherein a resistance value of the first resistor <NUM> is R1, and a resistance value of the first resistor <NUM> is R2. At the same time, it is assumed that the operating member <NUM> does not press against the elastic member <NUM> initially, but is in contact with the trigger structure <NUM>. At this moment, the trigger structure <NUM> is abutted against by the operating member <NUM> to contact two of the plurality of first printed circuits <NUM>, so that a conductive relationship is formed between the plurality of first printed circuits <NUM> and the first resistor <NUM> on the circuit board <NUM>, and the resistance value R2 can be measured by the electrical signals output by the at least two first conductive pins <NUM>, <NUM>. After the operating member <NUM> is pressed, the operating member <NUM> moves along the displacement stroke <NUM> and presses against the elastic member <NUM>, the operating member <NUM> no longer abuts against the trigger structure <NUM> to contact the plurality of first printed circuits <NUM>, so that the trigger structure <NUM> does not conduct with the plurality of first printed circuits <NUM>, and a conductive relationship is formed between the plurality of first printed circuits <NUM> and the first resistor <NUM> and the first resistor <NUM> on the circuit board <NUM>, and a resistance value R1+R2 can be measured by the electrical signals output by the at least two first conductive pins <NUM>, <NUM>. Also, please refer to <FIG> for another embodiment, the operating member <NUM> is not in contact with the trigger structure <NUM> initially, so that the trigger structure <NUM> does not conduct with the plurality of first printed circuits <NUM> initially, and the resistance value R1+R2 can be measured by the electrical signals output by the at least two first conductive pins <NUM>, <NUM>. The operating member <NUM> moves along the displacement stroke <NUM> and then contacts the trigger structure <NUM>, the trigger structure <NUM> is initially not conducted with the plurality of first printed circuits <NUM>, and the resistance value R2 can be measured by the electrical signals output by the at least two first conductive pins <NUM>, <NUM>. In this embodiment, the at least two first conductive pins <NUM>, <NUM> are COM pin and NO pin, respectively, known by a person having ordinary skill in the art.

It can be known from the above that the invention is no longer implemented with a metal lead frame, the plurality of first printed circuits <NUM> are provided with a conductive function through arrangement on the circuit board <NUM>, thereby achieving an object of providing signal discrimination in control by using the difference in resistance value. Meanwhile, compared with the prior art, the invention has the characteristics of being easy to assemble, which is beneficial to improving a production efficiency of the micro switch <NUM>.

In one embodiment, when the at least one conductive elastic plate <NUM> is used to be the trigger structure <NUM> for implementation, the at least one conductive elastic plate <NUM> has elastic deformation capability, and the at least one conductive elastic plate <NUM> comprises a fixed end <NUM> mounted on the circuit board <NUM>, and a free end <NUM> opposite to the fixed end <NUM>. The fixed end <NUM> normally contacts one of the plurality of first printed circuits <NUM>. In one embodiment, a mounting hole <NUM> is formed on the circuit board <NUM>, and the at least one conductive elastic plate <NUM> comprises at least one mounting arm <NUM> located at the fixed end <NUM>. When the fixed end <NUM> is mounted on the circuit board <NUM>, the mounting arm <NUM> is inserted into the mounting hole <NUM>, so that the fixed end <NUM> is electrically connected to one of the plurality of first printed circuits <NUM>. The free end <NUM> is capable of contacting the operating member <NUM> when the operating member <NUM> moves along the displacement stroke <NUM>, so that the free end <NUM> is deformed and displaced relative to the circuit board <NUM>. For example, assuming that the free end <NUM> is initially in contact with the other one of the plurality of first printed circuits <NUM>, from a side view of the circuit board <NUM>, there is a distance between the free end <NUM> and the other one of the plurality of first printed circuits <NUM> without conduction. The free end <NUM> is contacted by the operating member <NUM> when the operating member <NUM> moves along the displacement stroke <NUM>, so that the free end <NUM> is deformed to contact the other one of the plurality of first printed circuits <NUM>. In one embodiment, the at least one conductive elastic plate <NUM> of the invention comprises at least one conductive bulge <NUM> disposed on the free end <NUM>, the at least one conductive bulge <NUM> provides the free end <NUM> to be conducted with the other one of the plurality of first printed circuits <NUM>, and provides a single-point contact function for the at least one conductive elastic plate <NUM>.

Please refer to <FIG>, <FIG>, <FIG> and <FIG> for another embodiment that the trigger structure <NUM> is formed of two conductive elastic plates <NUM>. The operating member <NUM> is capable of contacting the two conductive elastic plates <NUM> during the displacement stroke <NUM>, or the two conductive elastic plates <NUM> are respectively contacted before and after moving along the displacement stroke <NUM>, as shown in <FIG>. Please refer to <FIG> and <FIG>, for the convenience of explanation, two conductive elastic plates <NUM>, <NUM> and two free ends <NUM>, <NUM> of the two conductive elastic plates <NUM>, <NUM> are provided. When the operating member <NUM> contacts the two conductive elastic plates <NUM>, <NUM>, the free end <NUM> and the free end <NUM> are disposed facing each other, that is, the two free ends <NUM>, <NUM> are disposed at a same level of the circuit board <NUM>. The operating member <NUM> can contact the two free ends <NUM>, <NUM> initially, or can contact the two free ends <NUM>, <NUM> after the displacement stroke <NUM> is completed. When the operating member <NUM> contacts the two conductive elastic plates <NUM>, <NUM> before and after moving along the displacement stroke <NUM> respectively, the two free ends <NUM>, <NUM> are not at a same level of the circuit board <NUM> and the free end <NUM> does not face the free end <NUM> as shown in <FIG>.

On the other hand, a quantity of first conductive pins in one embodiment is at least three, and in this embodiment, the first conductive pins are labeled as <NUM>, <NUM>, <NUM>, as shown in <FIG>. The first conductive pins <NUM>, <NUM>, <NUM> can be COM pin, NO pin and NC pin, respectively, which are commonly known by a person having ordinary skill in the art. In another embodiment, the circuit board <NUM> of the invention is regarded as a unit of the micro switch <NUM>. When the micro switch <NUM> is spliced by with multiple units based on requirements, the first conductive pins <NUM>, <NUM> on each of the circuit boards <NUM> of the micro switch <NUM> are served as a pin set, and a plurality of pin sets are provided on the micro switch <NUM>. In this embodiment, a quantity of the first conductive pins <NUM>, <NUM> on the circuit boards <NUM> will be four, five, six, and so on. In addition, a quantity of the first resistor <NUM> in the invention is not limited to those depicted in <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, a quantity of the first resistor <NUM> is not limited to one or two, but can be three, four, five, etc., based on requirements as shown in <FIG>.

In addition to the above, please refer to <FIG>, <FIG> and <FIG>. In one embodiment, the circuit board <NUM> comprises a second side <NUM> opposite to the first side <NUM>, a plurality of second printed circuits <NUM> arranged on the second side <NUM>, and at least one conductive through hole <NUM>. Specifically, the second side <NUM> refers to the other side surface of the circuit board <NUM> that is provided for printing, and the second side <NUM> is located on the other side of the circuit board <NUM> that does not face the space <NUM>. The plurality of second printed circuits <NUM> are partially located in the casing <NUM>, and the plurality of second printed circuits <NUM> are used to provide a conductive function for the circuit board <NUM> on the second side <NUM>. In one embodiment, the plurality of second printed circuits <NUM> can be formed of copper foil. The at least one conductive through hole <NUM> penetrates through the circuit board <NUM>, and the at least one conductive through hole <NUM> electrically connects one of the plurality of first printed circuits <NUM> with one of the second printed circuits <NUM>. In one embodiment, please refer to <FIG>, a port of the at least one conductive through hole <NUM> on a side of the first side <NUM> as shown by reference numeral <NUM> that is connected with the trigger structure <NUM>. When the trigger structure <NUM> is conducted, one of the plurality of second printed circuits <NUM> is capable of conducting with the plurality of first printed circuits <NUM> through the at least one conductive through hole <NUM>.

Two of the plurality of second printed circuits <NUM> extend out of the casing <NUM> to serve as at least two second conductive pins <NUM>, <NUM> of the micro switch <NUM>. It should be understood that in this embodiment, a quantity of the at least two second conductive pins <NUM>, <NUM> is also not limited to two, a quantity of the at least two second conductive pins <NUM>, <NUM> can be three, four, five, etc., based on requirements, provided that a width condition of the circuit board <NUM> permits. In addition, the at least two second conductive pins <NUM>, <NUM> are capable of providing assembly of another external device, so that the micro switch <NUM> is capable of realizing a function of providing control by the plurality of first printed circuits <NUM> and the plurality of second printed circuits <NUM> respectively. Accordingly, the micro switch <NUM> of the invention is capable of improving technical drawbacks in the conventional metal lead frame of only capable of providing a single type of circuit during a single conduction process and incapable of breaking through the single-pole single-throw technology.

In addition, in this embodiment, the at least two second conductive pins <NUM>, <NUM> are capable of generating differences in electrical signals based on conduction states of the plurality of second printed circuits <NUM>. The structures shown in <FIG>, <FIG>, <FIG> are taken as an example, it is assumed that when the trigger structure <NUM> is conducted with one of the plurality of first printed circuits <NUM>, the plurality of first printed circuits <NUM> are conducted with the plurality of second printed circuits <NUM>, and at the same time, it is assumed that initially the operating member <NUM> does not cause the trigger structure <NUM> conduct the plurality of first printed circuits <NUM> electrically connected with the plurality of second printed circuits <NUM>. At this moment, the plurality of second printed circuits <NUM> electrically connected with the plurality of first printed circuits <NUM> cannot receive electric power, and therefore there is no electric power flow between the second printed circuits <NUM>, and there is an open circuit between the two second conductive pins <NUM>, <NUM>. After the operating member <NUM> is operated, the trigger structure <NUM> conducts the plurality of first printed circuits <NUM> electrically connected with the plurality of second printed circuits <NUM>, so that electric power flows between the plurality of second printed circuits <NUM>, and the at least two second conductive pins <NUM>, <NUM> are conducted with each other. In another example, the operating member <NUM> can also conduct the plurality of first printed circuits <NUM> with the second printed circuits <NUM> at an initial stage, and cause the plurality of first printed circuits <NUM> not conducted with the plurality of second printed circuits <NUM> after being operated, and the detailed implementation thereof will not be repeated herein.

Further, in another embodiment, when the trigger structure <NUM> is at least two conductive elastic plates <NUM>, one of the two conductive elastic plates <NUM> is disposed at a port (shown as <NUM>) of the at least one conductive through hole <NUM> on the side of the first side <NUM>, and the other one of the at least two conductive elastic plates <NUM> is disposed in the mounting hole <NUM>. When the at least two conductive elastic plates <NUM> disposed in the at least one conductive through hole <NUM> are conducted, the plurality of first printed circuits <NUM> and the plurality of second printed circuits <NUM> are conducted with one another.

In another embodiment, the at least one conductive through hole <NUM> can also be disposed on one of the at least two second conductive pins <NUM>, <NUM>, and the at least one conductive through hole <NUM> is used to conduct one of the two first conductive pins <NUM>, <NUM> and one of the at least two second conductive pins <NUM>, <NUM>. In addition, the at least one conductive through hole <NUM> can further be a conductive hole <NUM> or a non-conductive hole <NUM>. Taking <FIG>, <FIG> as an example, when the conductive hole <NUM> is disposed on the first conductive pin <NUM> and the second conductive pin <NUM>, the conductive hole <NUM> causes the plurality of first printed circuits <NUM> and the plurality of second printed circuits <NUM> form a loop, when the non-conductive hole <NUM> is disposed on the first conductive pin <NUM> and the plurality of second conductive pin <NUM>, the plurality of first printed circuits <NUM> and the plurality of second printed circuits <NUM> do not form a loop.

In yet another embodiment, the circuit board <NUM> is also provided with at least one second resistor (not shown in the figures) on the second side <NUM>, the second resistor is electrically connected to two of the plurality of second printed circuits <NUM>, and is used to provide outputs of the at least two second conductive pins <NUM>, <NUM> with higher discrimination.

From another aspect, in one embodiment of the invention, in order to ensure that the operating member <NUM> is capable of reliably contacting the conductive elastic plate <NUM> when the operating member <NUM> moves along the displacement stroke <NUM>, the operating member <NUM> comprises a bulging portion <NUM> bulging toward the conductive elastic plate <NUM>. The bulging portion <NUM> is in contact with the conductive elastic plate <NUM> when the operating member <NUM> moves along the displacement stroke <NUM>. In another embodiment, the conductive elastic plate <NUM> comprises a protruding portion <NUM> protruding toward the operating member <NUM>. The protruding portion <NUM> can be directly formed by the conductive elastic plate <NUM>, or can be a structure additionally disposed on the conductive elastic plate <NUM>. The protruding portion <NUM> is in contact with the operating member <NUM> when the operating member <NUM> moves along the displacement stroke <NUM>, and causes the free end <NUM> to contact the circuit board <NUM> by contacting of the operating member <NUM>.

On the other hand, in one embodiment, the casing <NUM> comprises a cover <NUM> forming the space <NUM> and a base <NUM> installed in the cover <NUM>. The cover <NUM> is formed with an opening <NUM> through which the operating member <NUM> protrudes. The base <NUM> is provided for disposing the circuit board <NUM>, the base <NUM> divides the space <NUM> into a first part <NUM> and a second part <NUM>. The first part <NUM> is closed, and provided for the operating member <NUM> to move therein, the second part <NUM> is open, and the first resistor <NUM> is disposed in the second part <NUM>.

In order to stably install the circuit board <NUM> on the base <NUM>, the base <NUM> comprises a slot <NUM> formed on a side of the base <NUM>, and the slot <NUM> provides the circuit board <NUM> for disposal therein. In one embodiment, the slot <NUM> can be formed through two extending arms <NUM> on the base <NUM>. In another embodiment, the base <NUM> further comprises at least one protruding rib <NUM> formed in the slot <NUM>, and the protruding rib <NUM> is matched with a through hole <NUM> on the circuit board <NUM>. When the circuit board <NUM> is disposed in the slot <NUM>, the protruding rib <NUM> is inserted into the through hole <NUM>, so that the protruding rib <NUM> and the slot <NUM> jointly restrain the circuit board <NUM>.

In addition, in order for the invention to be capable of limiting assembly positions of the base <NUM> and the cover <NUM>, in one embodiment, the cover <NUM> comprises at least one stepped wall <NUM> surrounding the space <NUM>, and the stepped wall <NUM> is matched with the base <NUM> to limit a position of the base <NUM>. In addition, the cover <NUM> of the invention further comprises at least one restricting block <NUM>, the restricting block <NUM> protrudes toward the space <NUM>, after the base <NUM> and the cover <NUM> are assembled with each other, the restricting block <NUM> is stuck on a bottom of the base <NUM> to prevent the base <NUM> from falling off.

Claim 1:
A micro switch (<NUM>), comprising:
a casing (<NUM>), formed with a space (<NUM>);
a circuit board (<NUM>), assembled with the casing (<NUM>), and the circuit board (<NUM>) comprising a first side (<NUM>), a plurality of first printed circuits (<NUM>) arranged on the first side (<NUM>), at least one first resistor (<NUM>) disposed on the first side (<NUM>) and forming a conductive relationship with two of the plurality of first printed circuits (<NUM>), and a trigger structure (<NUM>) located on the first side (<NUM>), wherein a part of the first side (<NUM>) at least partially faces the space (<NUM>), and
a switching assembly (<NUM>), comprising an elastic member (<NUM>) located in the space (<NUM>), and an operating member (<NUM>) connected with the elastic member (<NUM>) and extending out of the casing (<NUM>) for pressing, wherein the operating member (<NUM>) comprises a displacement stroke (<NUM>) in the space (<NUM>), the operating member (<NUM>) contacts the trigger structure (<NUM>) while moving along the displacement stroke (<NUM>), characterized in that, the two of the plurality of first printed circuits (<NUM>) extend out of the casing (<NUM>) to be served as at least two first conductive pins (<NUM>, <NUM>) of the micro switch (<NUM>), and at least two first electrical signals are generated from the at least two first conductive pins (<NUM>, <NUM>) which are controlled by the plurality of first printed circuits (<NUM>), the first resistor (<NUM>), and the trigger structure (<NUM>), resistance values of the at least the two first electrical signals are different; and one of the two first electrical signals generated by the two first conductive pins (<NUM>, <NUM>) being changed to an other one of the two first electrical signals.