Keycap-replaceable double-loop switch with lamp

Abstract

The invention discloses a keycap-replaceable double-loop switch with a lamp, which comprises a switch seat and a seat cover which are connected with each other, and is characterized in that a light-permeable elastic isolation plate is arranged in the switch seat and divides the internal space of the switch seat into a first accommodating cavity and a second accommodating cavity; an LED light source and an elastic reset piece are arranged in the first containing cavity, and a light hole is formed in the elastic reset piece. A key shaft is arranged in the second containing cavity, the top of the key shaft extends out of the switch base and is detachably connected with a light-transmitting key cap, the bottom of the key shaft is provided with a force application part abutting against the top end of the elastic isolation plate, and a light-transmitting opening is formed in the force application part. A coupling piece is arranged on the outer side of the key shaft, a conductive terminal set is arranged on the side cavity wall of the second containing cavity, and when the key shaft moves up and down, the coupling piece can be driven to be coupled with or separated from the conductive terminal set, so that two functional loops are connected and disconnected at the same time. The LED light source can be prevented from being exposed, external water mist, dust or greasy dirt can be effectively prevented from entering, light transmission is kept, and therefore the reliability of the switch is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dual-circuit switches with lights, in particular to a dual-circuit switch with lights and replaceable keycaps. Background Art

[0002] Tactile switches are widely used in electronic devices and household appliances. Currently, during use, tactile switches are inevitably exposed to water mist, dust, or oil, which makes it easier for the switch resistance to increase, or even rust and rot, resulting in contact failure, affecting the normal use of related products and causing electrical failures. In severe cases, it can even cause electrical equipment to burn out and other electrical failures.

[0003] The Chinese patent number CN200920306463.5 discloses a waterproof touch switch with light, including a spring, a B button, an A button and an upper cover, as well as an LED lamp, a waterproof sheet, a base and multiple terminals. The spring, B button, waterproof sheet and A button are assembled from the bottom to the top of the base cavity, and the LED lamp is assembled in the A button. The base and multiple terminals are integrally formed into one piece by injection molding; multiple card points are designed on the base, and multiple card slots are designed on the upper cover, and the card points and the card slots are locked together one by one; 2 to 4 positioning protrusions are designed on the base, and 2 to 4 holes are designed on the waterproof sheet, and the positioning protrusions and the holes are matched together one by one.

[0004] Although the touch switch in the above patent has the functions of being waterproof, dustproof and oil-proof, the top of the A button is open and the LED lamp is installed at the opening of the A button, causing the LED lamp to be exposed. External water mist, dust or oil enters the A button and covers the LED lamp, affecting light transmittance; and the lamp pins of the LED lamp are led out from the slots on both sides of the A button. External water mist, dust or oil will also cover the lamp pins, which can easily cause malfunctions. The reliability of the touch switch with this structure is low. Summary of the Invention

[0005] The purpose of the present invention is to provide a dual-circuit switch with a replaceable keycap and light, which can prevent the LED light source from being exposed, effectively block the entry of external water mist, dust or oil, and maintain light transmission, thereby improving the reliability of the switch.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A lighted dual-circuit switch with replaceable keycaps comprises a switch base and a base cover connected to each other, wherein a light-transmitting elastic isolation plate is provided in the switch base, and the elastic isolation plate divides the internal space of the switch base into a first accommodating chamber and a second accommodating chamber; an LED light source and an elastic reset member whose top abuts the elastic isolation plate are provided in the first accommodating chamber, and a light-transmitting hole is provided on the elastic reset member; a key shaft with a light-transmitting channel formed inside is provided in the second accommodating chamber, the top of the key shaft extends through the base cover and out of the switch base, and is detachably connected to a light-transmitting keycap, the bottom of the key shaft has a force-applying portion abutting the top of the elastic isolation plate, and a light-transmitting port connected to the light-transmitting channel is provided at the force-applying portion; a coupling member is provided on the outside of the key shaft, and a conductive terminal group is provided on the side cavity wall of the second accommodating chamber, and when the key shaft moves up and down, it can drive the coupling member to couple or separate with the conductive terminal group to simultaneously switch two functional circuits on and off.

[0008] On the basis of the above technical solution, the present invention can be improved as follows:

[0009] Furthermore, the switch seat is provided with a stepped portion on the inner side wall, the stepped portion forms a straight stepped surface at the top, and the edge of the elastic isolation plate overlaps the stepped surface of the stepped portion.

[0010] Furthermore, the elastic return member is a circular disc that is higher in the middle and lower on all sides, and the circular disc has the light-transmitting hole in the middle; a limiting portion is provided at the edge of the circular disc; and a limiting groove is provided on the step surface of the step portion, and the limiting groove on the step portion and the limiting portion on the circular disc cooperate with each other to limit the circular disc in the first accommodating cavity, so that the top of the circular disc after limitation abuts against the bottom end of the elastic isolation plate, and the light-transmitting hole on the circular disc is opposite to the LED light source.

[0011] Furthermore, the key shaft is provided with a convex edge on the outer peripheral wall at the bottom end. In the free state, the top surface of the convex edge is in contact with the bottom surface of the seat cover, and the force-applying portion at the bottom end of the key shaft abuts against the top end of the elastic isolation plate.

[0012] Furthermore, the second accommodating chamber is provided with guide parts on two opposite side cavity walls, and support parts are provided on the other two opposite side cavity walls; the key shaft is provided with guide grooves in the middle of the convex edges on the opposite sides, and the guide parts on the second accommodating chamber are slidably matched with the guide grooves on the key shaft in a one-to-one correspondence, and the two support parts on the second accommodating chamber respectively support the convex edges on the other opposite sides of the key shaft.

[0013] Furthermore, there are two conductive terminal groups, each conductive terminal group includes an input terminal and an output terminal for accessing a functional circuit; the input terminal and the output terminal are fixedly mounted on the side cavity wall of the second accommodating cavity, and are located on both sides of the support portion; there are two coupling members, respectively arranged on opposite sides of the key shaft; when the key shaft moves downward, it drives the coupling member to couple with the adjacent input terminal and the output terminal.

[0014] Furthermore, the input terminal and the output terminal each include a contact portion exposed on a side wall of the second accommodating cavity, and a connecting portion embedded in the switch seat, wherein the connecting portion extends out of the switch seat to form a pin.

[0015] Furthermore, each of the coupling members includes a substrate portion embedded in the convex edge of the key shaft, and two coupling portions arranged on the substrate portion; when the key shaft moves downward, the two coupling portions in each coupling member are respectively coupled with the contact portions of the adjacent input terminal and the output terminal.

[0016] Furthermore, the base portion of each coupling member is an elongated sheet, and each elongated sheet extends on the same side in the width direction and bends upward to form two coupling portions, and the two coupling portions are respectively located at both ends of the elongated sheet in the length direction.

[0017] Furthermore, the first accommodating cavity is provided with a lamp trough in the middle of the bottom cavity wall, and the LED light source is accommodated in the lamp trough. The LED light source is provided with pins extending out of the switch seat at the positive pole and the negative pole respectively.

[0018] Compared with the prior art, the technology of the present invention has the following advantages:

[0019] The present invention provides a light-transmitting elastic isolation plate in the switch seat to separate the internal space of the switch seat into a first accommodating chamber and a second accommodating chamber; an LED light source and an elastic reset member are provided in the first accommodating chamber, a light-transmitting hole is provided on the elastic reset member, and a key shaft with a light-transmitting channel formed inside is provided in the second accommodating chamber, the top of the key shaft extends out of the switch seat and is detachably connected to a key cap, and a force-applying portion at the bottom of the key shaft is provided with a light-transmitting port connected to the light-transmitting channel; the light beam emitted by the LED light source can illuminate the key cap after passing through the elastic reset member, the elastic isolation plate and the key shaft in sequence; since the elastic isolation plate seals the elastic reset member, the key shaft can illuminate the key cap; The light-transmitting hole on the reset member and the light-transmitting port on the key shaft prevent the LED light source from being exposed, effectively block the entry of external water mist, dust or oil and maintain light transmission, thereby improving the reliability of the switch; and a coupling member is provided on the outside of the key shaft, and a conductive terminal group is provided on the side cavity wall of the second accommodating cavity. When the key shaft moves up and down, it can drive the coupling member to couple or separate with the conductive terminal group to simultaneously switch two functional circuits. Since the coupling member and the conductive terminal group are coupled or separated beside the key shaft, the lateral space of the switch base can be fully utilized, the overall thickness of the switch can be reduced, and it is conducive to miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of a dual-circuit switch with an illuminated keycap and replaceable keycaps using an SMT (J-bend) pin structure.

[0022] Figure 2 This is a disassembly diagram of the illuminated dual-circuit switch with replaceable keycaps in Example 1;

[0023] Figure 3 1 is a cross-sectional view of the illuminated dual-circuit switch with replaceable keycaps in Example 1 when the translucent keycaps are not installed;

[0024] Figure 4 This is a schematic structural diagram of the illuminated dual-circuit switch in Example 1, in which no light-transmitting keycaps are installed and the keycaps can be replaced after the switch base and base cover are removed;

[0025] Figure 5 This is a schematic diagram of the top structure of the switch base in Example 1;

[0026] Figure 6 This is a schematic diagram of the bottom structure of the switch base in Example 1;

[0027] Figure 7 Schematic diagram of the top structure of the key shaft in Example 1;

[0028] Figure 8 Schematic diagram of the bottom structure of the key shaft in Example 1;

[0029] Figure 9 Schematic diagram of the structure of the circular disc in Example 1;

[0030] Figure 10 This is a schematic diagram of the structure of the conductive terminal group and the pins on the LED light source in the embodiment;

[0031] Figure 11 Schematic diagram of a dual-circuit switch with illuminated keycaps and replaceable keycaps using an SMT pin structure without translucent keycaps installed;

[0032] Figure 12 Schematic diagram of a dual-circuit switch with an illuminated keycap and replaceable keycaps using a DIP pin structure without a translucent keycap installed;

[0033] Figure 13 This is a schematic diagram of the bottom structure of the switch base in Example 2.

[0034] Markings on the accompanying drawings: 1-switch seat, 101-first accommodating cavity, 102-second accommodating cavity, 102a-first side cavity wall, 102b-second side cavity wall, 102c-third side cavity wall, 102d-fourth side cavity wall, 103-riveted portion, 104-step portion, 105-limiting groove, 106-guide portion, 107-support portion, 108-lamp trough, 109-pin fitting groove, 2-seat cover, 201-riveted hole, 202-through hole, 3-LED light source, 4-key shaft, 401-force applying portion, 402- Protruding edge, 403-guide groove, 5-translucent keycap, 6-hook, 7-elastic isolation plate, 8-circular disc, 801-light-transmitting hole, 802-limiting portion, 9-first contact portion, 10-first pin, 11-second contact portion, 12-second pin, 13-third contact portion, 14-third pin, 15-fourth contact portion, 16-fourth pin, 17-first substrate portion, 18-first coupling portion, 19-second substrate portion, 20-second coupling portion, 21-fifth pin, 22-sixth pin, 23-positioning column. DETAILED DESCRIPTION

[0035] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings. The description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] Example 1

[0037] See also Figures 1 to 10 This embodiment relates to a dual-circuit switch with replaceable keycaps and an illumination device, comprising a switch base 1 and a base cover 2 connected to each other, an illuminating LED light source 3 arranged in the switch base 1, and an elastic return member and a key shaft 4 arranged in sequence along the light path of the LED light source 3; a light-transmitting hole 801 is formed in the elastic return member; a light-transmitting channel is provided inside the key shaft 4; the top end of the key shaft 4 extends out of the switch base 1 and is provided with a hook 6 for connecting to a light-transmitting keycap 5; the light beam emitted by the LED light source 3 passes through the light-transmitting hole 801 on the elastic return member and the light-transmitting channel inside the key shaft 4 in sequence, and then shines on the connected light-transmitting keycap 5 and transmits outward.

[0038] It should be noted that the translucent keycap 5 is a conventional keycap in the prior art, and the translucent keycap 5 has a card slot. The card slot on the translucent keycap 5 and the hook 6 on the key shaft 4 are snap-fitted with each other to removably install the translucent keycap 5 on the top of the key shaft 4. This snap-fit ​​connection method is a conventional detachable connection method in this technical field; technical personnel in this field can select a suitable translucent keycap 5 for installation according to actual use needs. The key shaft 4 in this embodiment can be adapted to install a conventional translucent keycap 5 in the prior art.

[0039] A chamber for accommodating the LED light source 3, the key shaft 4 and the elastic return member is formed inside the switch base 1; the key shaft 4 has a force-applying portion 401 at the bottom end, and a light-transmitting opening connected to the light-transmitting channel is formed in the force-applying portion 401; in the free state, the force-applying portion 401 of the key shaft 4 abuts the top of the elastic return member, and the light-transmitting opening on the force-applying portion 401 and the light-transmitting hole 801 on the elastic return member are axially opposite to each other, so that the light beam emitted by the LED light source 3 can pass through the elastic return member and the key shaft 4; when the transparent keycap 5 is pressed, the key shaft 4 moves axially downward relative to the switch base 1, and the elastic return member is elastically deformed by the force-applying portion 401 of the key shaft 4 to generate elastic force; when the transparent keycap 5 is released, the elastic force of the elastic return member acts on the force-applying portion 401 of the key shaft 4, driving the key shaft 4 to move axially upward relative to the switch base 1 to restore its original position.

[0040] A light-transmitting elastic isolation plate 7 is provided between the elastic reset member and the force-applying portion 401 of the key shaft 4. The elastic isolation plate 7 divides the accommodating chamber inside the switch seat 1 into a first accommodating chamber 101 and a second accommodating chamber 102 located above the first accommodating chamber 101; the elastic reset member and the LED light source 3 are located in the first accommodating chamber 101; the key shaft 4 is located in the second accommodating chamber 102; in the free state, the top of the elastic reset member and the force-applying portion 401 of the key shaft 4 respectively abut against the top and bottom ends of the elastic isolation plate 7 to close the light-transmitting port on the force-applying portion 401 and the light-transmitting hole 801 on the elastic reset member, thereby preventing the LED light source 3 from being exposed, effectively blocking the entry of external water mist, dust or oil, and maintaining light transmission.

[0041] A coupling structure is arranged between the outer side of the key shaft 4 and the side cavity wall of the second accommodating cavity 102. The coupling structure can simultaneously conduct two functional circuits when the key shaft 4 moves downward; the coupling structure includes two coupling parts arranged on the outer side of the key shaft 4, and two conductive terminal groups arranged on the side cavity wall of the second accommodating cavity 102.

[0042] Specifically, the switch base 1 is a square base structure, and a base opening is formed at the top of the switch base 1, through which the key shaft 4, elastic isolation plate 7, elastic reset member and LED light source 3 are easily installed into the switch base 1; according to actual conditions, other base structures suitable for installing the key shaft 4, elastic isolation plate 7, elastic reset member and LED light source 3 can also be used instead, such as a rectangular or cylindrical base structure; the base cover 2 is arranged at the top base opening of the switch base 1.

[0043] The switch base 1 is provided with a rivet portion 103 at the top, and the base cover 2 is provided with a rivet hole 201 adapted to the rivet portion 103. The rivet portion 103 and the rivet hole 201 are riveted together to fix the switch base 1 and the base cover 2 to each other.

[0044] In this embodiment, four riveted parts 103 are provided, which are respectively arranged at four right angles of the switch base 1; the riveted parts 103 include an integrally formed connecting section and a riveted section, the connecting section is a cylindrical structure, the bottom end of the connecting section is connected to the top surface of the switch base 1, and the top end of the connecting section is connected to the riveted section, the riveted section is a semi-spherical structure, the bottom surface of the riveted section is a flat surface, and the top surface is a spherical surface; the diameter of the riveted section is larger than the diameter of the connecting section; during riveting, the connecting section of the riveted part 103 passes through the riveting hole 201 on the socket cover 2, the bottom surface of the riveted section is in contact with the top surface of the base cover 2, and the bottom surface of the base cover 2 is in contact with the top surface of the switch base 1, thereby fixing the base cover 2 on the switch base 1.

[0045] The base cover 2 is a square cover structure corresponding to the base opening of the switch base 1. A through-hole 202 is provided in the middle of the base cover 2. The top end of the key shaft 4 extends out of the switch base 1 through the through-hole 202 to facilitate the installation of the translucent keycap 5. The shape of the through-hole 202 corresponds to the cross-sectional shape of the key shaft 4. The base cover 2 is provided with rivet holes 201 at four right angles that can be riveted to the corresponding rivet parts 103 on the switch base 1.

[0046] The switch base 1 is provided with a stepped portion 104 on the inner side wall, and the edge of the elastic isolation plate 7 overlaps the stepped portion 104, and the top of the stepped portion 104 is a flat stepped surface; in this embodiment, the elastic isolation plate 7 is a circular plate structure made of a translucent elastic material. Depending on actual conditions, other shaped plate structures can also be used instead, such as a square plate structure; the top and bottom ends of the elastic isolation plate 7 are both flat plate surfaces, and the bottom surface of the edge of the elastic isolation plate 7 is in contact with the stepped surface of the stepped portion 104 to support the elastic isolation plate 7 in the accommodating chamber and parallel to the bottom cavity wall of the accommodating chamber, thereby dividing the accommodating chamber into a first accommodating chamber 101 and a second accommodating chamber 102. Since the supported elastic isolation plate 7 is close to the bottom wall of the switch base 1, the longitudinal space of the separated second accommodating chamber 102 is larger than the longitudinal space of the first accommodating chamber 101, so that the key shaft 4 can be accommodated in the second accommodating chamber 102.

[0047] The elastic return member is a circular disc 8 that is higher in the middle and lower on all sides. A light-transmitting hole 801 is opened in the middle of the circular disc 8, and a limiting portion 802 is provided on the edge of the circular disc 8; the step portion 104 in the switch seat 1 is provided with a limiting groove 105 on the step surface. The limiting groove 105 on the step portion 104 and the limiting portion 802 on the circular disc 8 cooperate with each other to limit the circular disc 8 in the first accommodating cavity 101, so that the top end of the circular disc 8 after being limited abuts the bottom surface of the elastic isolation plate 7, and the light-transmitting hole 801 on the circular disc 8 is opposite to the LED light source 3 provided on the bottom cavity wall of the first accommodating cavity 101, so that the light beam emitted by the LED light source 3 can pass through the circular disc 8.

[0048] There are four limiting portions 802 on the circular disc 8, and the four limiting portions 802 are arranged at equal intervals around the edge of the circular disc 8; accordingly, there are four limiting grooves 105 on the stepped portion 104, and the limiting grooves 105 and the limiting portions 802 correspond to each other one by one to form four fulcrums on the periphery of the circular disc 8, which can provide supporting force to the circular disc 8 when under pressure, thereby improving the stability of the circular disc 8 and avoiding uneven force causing the circular disc 8 to tilt and deform to one side when under pressure, resulting in insufficient rebound or inability to rebound.

[0049] The key shaft 4 is a hollow rectangular columnar structure. The inner cavity of the key shaft 4 serves as a light-transmitting channel. The key shaft 4 forms an opening at the top end thereof that communicates with the inner cavity. The outer peripheral wall of the key shaft 4 at the bottom end is provided with a convex edge 402. The convex edge 402 is used to limit the axial direction of the key shaft 4 in the second accommodating cavity 102 to prevent the key shaft 4 from falling off the switch seat 1. In the free state, the top surface of the convex edge 402 on the key shaft 4 is in contact with the bottom surface of the seat cover 2. The top end of the key shaft 4 passes through the seat cover 2 through the through hole 202 and extends out of the switch seat 1. The force-applying portion 401 at the bottom end of the key shaft 4 abuts against the elastic spacer. The top surface of the plate 7; the force-applying portion 401 is a circular flange, and a circular light-transmitting opening is arranged on the bottom surface of the circular flange, and the light-transmitting opening axially penetrates the bottom wall of the inner cavity of the key shaft 4 to facilitate the transmission of the light beam emitted by the LED light source 3; the bottom wall of the inner cavity of the key shaft 4 forms a chamfer at the penetration point, the diameter of which gradually increases from the bottom end to the top end of the key shaft 4. Since the light beam has a certain divergence during the propagation process, the chamfer can reduce the interference at the edge of the light beam, thereby avoiding the generation of a shadow black circle when the light beam is irradiated on the light-transmitting keycap 5, so that the light-transmitting keycap 5 is evenly light-transmitting.

[0050] It should be noted that the diameter of the force-applying portion 401 should be larger than the diameter of the light-transmitting hole 801 on the circular disc 8 , and the diameter of the light-transmitting opening on the force-applying portion 401 should be larger than the diameter of the light-transmitting hole 801 on the circular disc 8 , so that the light beam emitted by the LED light source 3 can pass through.

[0051] When the translucent keycap 5 is pressed, the key shaft 4 moves downward, the circular flange presses against the elastic isolation plate 7, the elastic isolation plate 7 bends downward, the circular disc 8 is squeezed into a flat shape and generates elastic force; when the translucent keycap 5 is released, under the action of the elastic force, the circular disc 8 supports the elastic isolation plate 7, the elastic isolation plate 7 returns to its original straight state, and drives the key shaft 4 to move upward during the recovery process, thereby completing the reset of the key shaft 4.

[0052] The second accommodating chamber 102 has a first side wall 102a, a second side wall 102b, a third side wall 102c, and a fourth side wall 102d. The first side wall 102a and the third side wall 102c are opposite to each other, and the second side wall 102b and the fourth side wall 102d are opposite to each other. The second accommodating chamber 102 is provided with a guide portion 106 on the second side wall 102b and the fourth side wall 102d, and a support portion 107 on the first side wall 102a and the third side wall 102c. Both the guide portion 106 and the support portion 107 are vertically arranged blocks.

[0053] The key shaft 4 is provided with a guide groove 403 in the middle of the convex edges 402 on the opposite sides. The guide groove 403 is a vertical groove body, and the two ends of the guide groove 403 pass through the top and bottom surfaces of the convex edge 402; the two guide parts 106 on the second accommodating cavity 102 are slidably matched with the two guide grooves 403 on the key shaft 4 in a one-to-one manner, and the two support parts 107 on the second accommodating cavity 102 respectively support the convex edges 402 on the other opposite sides of the key shaft 4 to radially limit the key shaft 4 in the second accommodating cavity 102, so that the light-transmitting port of the key shaft 4 is axially opposite to the light-transmitting hole 801 of the circular disc 8, and the key shaft 4 moves axially to reduce the shaking generated during axial movement.

[0054] A first coupling space is formed between the first side cavity wall 102a and the opposite convex edge 402 on both sides of the support portion 107, and a second coupling space is formed between the third side cavity wall 102c and the opposite other convex edge 402 on both sides of the support portion 107; when the key shaft 4 moves downward, one coupling piece and one conductive terminal group can be coupled in the first coupling space, and the other coupling piece and another conductive terminal group can be coupled in the second coupling space; by coupling beside the key shaft 4, the lateral space of the switch base 1 can be fully utilized, the overall thickness of the switch can be reduced, and miniaturization can be achieved.

[0055] For the sake of convenience of description, the two conductive terminal groups in this embodiment are named as the first conductive terminal group and the second conductive terminal group respectively; the first conductive terminal group includes a first input terminal and a first output terminal for connecting to one of the functional circuits, and the second conductive terminal group includes a second input terminal and a second output terminal for connecting to the other functional circuit; the first input terminal and the first output terminal are fixedly mounted on the first side cavity wall 102a of the second accommodating cavity 102, and are located on both sides of the support portion 107; the second input terminal and the second output terminal are fixedly mounted on the third side cavity wall 102c of the second accommodating cavity 102, and are located on both sides of the support portion 107.

[0056] The first input terminal includes a first contact portion 9 exposed at the first side cavity wall 102a, and a first connecting portion embedded in the switch base 1, the first connecting portion extending out of the switch base 1 to form a first pin 10; the first output terminal includes a second contact portion 11 exposed at the first side cavity wall 102a, and a second connecting portion embedded in the switch base 1, the second connecting portion extending out of the switch base 1 to form a second pin 12; the first pin 10 and the second pin 12 are respectively connected to the input end and the output end of one of the functional circuits.

[0057] The second input terminal includes a third contact portion 13 exposed on the third side cavity wall 102c, and a third connecting portion embedded in the switch base 1, the third connecting portion extending outside the switch base 1 to form a third pin 14; the second output terminal includes a fourth contact portion 15 exposed on the third side cavity wall 102c, and a fourth connecting portion embedded in the switch base 1, the fourth connecting portion extending outside the switch base 1 to form a fourth pin 16; the third pin 14 and the fourth pin 16 are respectively connected to the input end and output end of another functional circuit.

[0058] For the convenience of description, the two coupling members in this embodiment are named as the first coupling member and the second coupling member respectively; the first coupling member includes a first substrate portion 17 buried in the convex edge 402 on the key shaft 4 opposite to the first side cavity wall 102a, and two first coupling portions 18 arranged on the first substrate portion 17; the second coupling member includes a second substrate portion 19 buried in the convex edge 402 on the key shaft 4 opposite to the second side cavity wall 102b, and two second coupling portions 20 arranged on the second substrate portion 19; when the key shaft 4 moves downward, the two first coupling portions 18 are respectively coupled with the first contact portion 9 of the first input terminal and the second contact portion 11 of the first output terminal, and the two second coupling portions 20 are respectively coupled with the third contact portion 13 of the second input terminal and the fourth contact portion 15 of the second output terminal, thereby simultaneously conducting two functional circuits.

[0059] The two coupling members are made of elastic conductive material, such as copper; the base portions of the two coupling members are both elongated sheets, each of which extends on the same side in the width direction and bends upward to form two coupling portions, which are located at the two ends of the elongated sheet in the length direction. The coupling portions on the coupling members can abut the contact portions of the four terminals under the action of their own elastic force; the contact portions of the four terminals are all square sheet structures, which can increase the contact area with the coupling portions on the coupling members to improve the coupling reliability of the switch.

[0060] A lamp trough 108 is provided in the middle of the bottom cavity wall of the first accommodating cavity 101, and the LED light source 3 is accommodated in the lamp trough 108; in this embodiment, the LED light source 3 is a SMD LED lamp, and the SMD LED lamp is provided with a fifth pin 21 and a sixth pin 22 extending out of the switch seat 1 at the positive and negative poles respectively.

[0061] The first pin 10, the second pin 12, the third pin 14, the fourth pin 16, the fifth pin 21 and the sixth pin 22 extend to the outside of the switch base 1 and are bent and attached to the bottom surface of the switch base 1. The switch base 1 is provided with corresponding pin fitting grooves 109 on the bottom surface to facilitate the insertion of the bent pins, thereby reducing the overall size of the switch.

[0062] When the switch is installed, the six pins are soldered to the PCB board, and the positive and negative poles of the SMD LED lamp are connected to the light source circuit to conduct light. The LED light source 3 is not controlled by the switch in this embodiment, but by the light source circuit to which it is connected. For this reason, the LED light source 3 is connected to the light source circuit and is in a normally open state. The switch is only used to simultaneously switch on and off the two functional circuits on the PCB board except the light source circuit.

[0063] It should be noted that the six pins in this embodiment are SMT patch type (J-shaped bend) pin structures. According to actual needs, other pin structures suitable for connecting to PCB boards in the prior art can also be adopted, for example: Figure 11 The SMT patch pin structure shown or Figure 12 The DIP pin structure is shown.

[0064] Example 2

[0065] See also Figure 13 The difference between the technical solution of the second embodiment and the first embodiment is that, in the present embodiment, the switch base 1 is provided with a positioning column 23 at the bottom. The positioning column 23 can cooperate with the positioning hole preset on the PCB board to facilitate the positioning and installation of the key switch on the PCB board, so that the fifth pin 21 on the positive pole of the LED lamp is connected to the input end of the light source circuit, and the sixth pin 22 on the negative pole of the LED lamp is connected to the output end of the light source circuit, which effectively avoids the positive and negative poles of the LED lamp being connected in reverse.

[0066] The above embodiments of the present invention are not intended to limit the scope of protection of the present invention, and the implementation methods of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in this field, without departing from the above basic technical ideas of the present invention, should fall within the scope of protection of the present invention.

Claims

1. A dual-circuit switch with a replaceable keycap and an indicator light, comprising a switch base and a base cover connected to each other, characterized in that: A light-transmitting elastic isolation plate is provided in the switch seat, and the elastic isolation plate divides the internal space of the switch seat into a first accommodating chamber and a second accommodating chamber; an LED light source and an elastic reset member whose top abuts the elastic isolation plate are provided in the first accommodating chamber, and a light-transmitting hole is provided on the elastic reset member; a key shaft with a light-transmitting channel formed inside is provided in the second accommodating chamber, the top of the key shaft extends through the seat cover and out of the switch seat and is detachably connected to a light-transmitting keycap, the bottom of the key shaft has a force-applying portion abutting the top of the elastic isolation plate, and a light-transmitting port connected to the light-transmitting channel is provided at the force-applying portion; a coupling member is provided on the outside of the key shaft, and a conductive terminal group is provided on the side cavity wall of the second accommodating chamber. When the key shaft moves up and down, it can drive the coupling member to couple or separate with the conductive terminal group to simultaneously switch two functional circuits on and off.

2. The dual-circuit switch with replaceable keycaps and light according to claim 1, characterized in that: The switch seat is provided with a stepped portion on the inner side wall, the stepped portion forms a straight stepped surface at the top, and the edge of the elastic isolation plate overlaps the stepped surface of the stepped portion.

3. The dual-circuit switch with replaceable keycaps and light according to claim 2, characterized in that: The elastic return member is a circular disc that is higher in the middle and lower around. The circular disc has the light-transmitting hole in the middle; a limiting portion is provided at the edge of the circular disc; a limiting groove is provided on the step surface of the stepped portion, and the limiting groove on the stepped portion and the limiting portion on the circular disc cooperate with each other to limit the circular disc in the first accommodating cavity, so that the top of the circular disc after limitation abuts against the bottom end of the elastic isolation plate, and the light-transmitting hole on the circular disc is opposite to the LED light source.

4. The dual-circuit switch with replaceable keycaps and light according to claim 3, characterized in that: The key shaft is provided with a convex edge on the outer peripheral wall at the bottom end. In the free state, the top surface of the convex edge is in contact with the bottom surface of the seat cover, and the force-applying portion at the bottom end of the key shaft abuts against the top end of the elastic isolation plate.

5. The dual-circuit switch with replaceable keycaps and light according to claim 4, characterized in that: The second accommodating chamber is provided with guiding parts on two opposite side cavity walls, and supporting parts are provided on the other two opposite side cavity walls; the key shaft is provided with guiding grooves in the middle of the convex edges on the opposite sides, and the guiding parts on the second accommodating chamber are slidably matched with the guide grooves on the key shaft in a one-to-one manner, and the two supporting parts on the second accommodating chamber respectively support the convex edges on the other opposite sides of the key shaft.

6. The dual-circuit switch with replaceable keycaps and light according to claim 5, characterized in that: There are two conductive terminal groups, each conductive terminal group includes an input terminal and an output terminal for accessing a functional circuit; the input terminal and the output terminal are fixedly mounted on the side cavity wall of the second accommodating cavity and are located on both sides of the support portion; there are two coupling members, respectively arranged on opposite sides of the key shaft; when the key shaft moves downward, it drives the coupling member to couple with the adjacent input terminal and the output terminal.

7. The dual-circuit switch with replaceable keycaps and light according to claim 6, characterized in that: The input terminal and the output terminal each include a contact portion exposed on a side wall of the second accommodating cavity, and a connecting portion embedded in the switch seat, wherein the connecting portion extends out of the switch seat to form a pin.

8. The dual-circuit switch with replaceable keycaps and light according to claim 7, characterized in that: Each of the coupling members includes a substrate portion embedded in the convex edge of the key shaft, and two coupling portions arranged on the substrate portion; when the key shaft moves downward, the two coupling portions in each coupling member are respectively coupled with the contact portions of the adjacent input terminal and the output terminal.

9. The dual-circuit switch with replaceable keycaps and light according to claim 8, characterized in that: The base portion of each coupling member is a long sheet. Each long sheet extends on the same side in the width direction and bends upward to form two coupling portions. The two coupling portions are respectively located at two ends of the long sheet in the length direction.

10. The dual-circuit switch with replaceable keycaps and light according to claim 9, characterized in that: The first accommodating cavity is provided with a lamp trough in the middle of the bottom cavity wall. The LED light source is accommodated in the lamp trough. The LED light source is provided with pins extending out of the switch seat at the positive pole and the negative pole respectively.

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