Lamp and elastic contact terminal at end part of lamp

Abstract

The invention provides an elastic contact terminal at the end part of a lamp, which comprises a plug-in frame, the plug-in frame is suitable for being connected to the end part of a shell of the lamp in a matched manner, two conductive elastic sheets are arranged in the plug-in frame at intervals, and the conductive elastic sheets extend along the length direction of the shell; the length of the conductive elastic pieces is larger than that of the plug-in frame, each conductive elastic piece comprises a clamping head exposed out of the plug-in frame, the clamping heads of the two conductive elastic pieces are arranged to be capable of relatively opening and closing, the opposite inner sides of the clamping heads abut against elastic elements, and the deformation restoring force of the elastic elements enables the clamping heads to have the outward opening tendency. The invention aims to solve the problems of insufficient elasticity and permanent deformation caused by long-time use of the reed contact terminal of the small lamp, can ensure continuous and effective contact between the conductive elastic sheet and the conductive strip, remarkably improves the reliability of the lamp and prolongs the service life of the lamp, and has high practicability and economical efficiency.

Description

Technical Field

[0001] The invention relates to the field of lamps, and in particular to a lamp and an elastic contact terminal at the end thereof. Background Art

[0002] The reed contact terminals of small lamps are often difficult to design into large or complex structures due to the compactness of the product space, which directly leads to their insufficient elastic performance. During long-term use, the reed contact terminals are prone to permanent deformation due to frequent mechanical stress, which in turn causes a reduction in contact area and insufficient contact. When the pressure between the contact terminals is not enough to maintain stable electrical contact, the transmission of current will be affected, and eventually the lamp will not work properly and will not light up. This problem not only affects the user's normal use experience, but may also pose a safety hazard.

[0003] Therefore, how to design a reliable and economical reed contact terminal within a limited space has become a technical problem that needs to be solved urgently in the field of small lamp design and manufacturing.

[0004] Therefore, those skilled in the art are committed to developing a lamp and an elastic contact terminal at its end, aiming to solve the problem of insufficient elasticity and permanent deformation of the reed contact terminal of a small lamp caused by long-term use. Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is the problem of insufficient elasticity and permanent deformation of the reed contact terminals in the existing small lamps due to long-term use.

[0006] To achieve the above-mentioned purpose, the present invention provides an elastic contact terminal at the end of a lamp, including a plug-in frame, which is suitable for being connected to the end of a shell of the lamp, and two conductive springs are arranged at intervals in the plug-in frame, wherein the conductive spring extends along the length direction of the shell, the length of the conductive spring is greater than the length of the plug-in frame and includes a card connector exposed from the plug-in frame, and the card connectors of the two conductive springs are arranged to be able to open and close relative to each other, and elastic elements are abutted on the inner sides of the card connectors facing each other, and the deformation restoring force of the elastic element makes the card connector have a tendency to open outward.

[0007] Furthermore, the conductive spring sheet includes a fixed part and a movable part. The fixed part is fixedly installed with the plug-in frame, and the movable part is connected between the fixed part and the card connector along the length direction. A movable gap of the movable part is set on the plug-in frame so that the movable part can swing along the width direction.

[0008] Furthermore, the plug-in rack includes a base plate and a mounting wall, wherein the base plate is extended along the length direction of the shell, the conductive spring is adaptively mounted on the base plate, and the mounting wall is vertically arranged on both sides of the base plate and is cooperatively connected to the inner side of the shell.

[0009] Furthermore, a spacing rib is protrudingly provided on the substrate, the spacing rib extends along the length of the shell, two conductive springs are respectively installed on different sides of the spacing rib and positioned between the spacing rib and the mounting wall, and the elastic element abuts between the spacing rib and the conductive spring.

[0010] Furthermore, the two card joints are formed with inner recesses on opposite sides along the width direction, and the elastic element abuts against the inner recesses to cause the card joints to open outward; an avoidance groove is formed extending from the inner recess in a direction away from the end of the card joint, and is configured to provide a accommodating space for the elastic element when the elastic element is compressed and deformed.

[0011] Preferably, the middle part of the elastic element includes a bending portion, which is configured to abut against the inner recess of the card joint. One end of the elastic element is a supporting foot, which is configured to form a supporting point in the plug-in frame, and the other end is a movable foot, which is configured to move in the avoidance groove with the elastic deformation of the elastic element. The elastic element is configured to be able to open under force and has a tendency to make the movable foot approach the supporting foot end under the deformation recovery force.

[0012] Furthermore, the avoidance groove includes one or more inclined surfaces extending from the clamping joint to the fixed portion, so that the radial dimension of the movable portion is smaller than that of the fixed portion.

[0013] Furthermore, the plug-in frame also includes a cover plate, which cooperates with the base plate to cover and form a receiving space for isolating two conductive spring sheets respectively, and at the same time provides a support point for the elastic element.

[0014] The present invention also provides a strip lamp, comprising a strip-shaped shell, an opening is provided at the end of the shell along the length direction, a circuit board is fixedly installed in the shell, elastic contact terminals as mentioned above are installed along the end of the shell, a conductive spring is electrically connected to the circuit board in the shell, and a card connector is exposed outside the shell.

[0015] Furthermore, the tail of the conductive spring sheet includes legs extending in the shell along the length direction, and the ends of the legs of each conductive spring sheet are respectively embedded in the connection holes on the circuit board to be electrically connected to the positive and negative lines of the circuit board.

[0016] Furthermore, the shell includes a bottom surface and two side walls, an assembly groove is provided on the inner side of the side wall, a plug-in strip adapted to the assembly groove is provided on the outer side of the plug-in frame, the assembly groove on each side includes a wire groove, a conductive strip is installed along the wire groove in the shell, the middle part of the conductive spring sheet includes a side extension portion extending laterally to expose the plug-in frame, and after the plug-in frame is assembled, the conductive spring sheet on each side is electrically connected to the conductive strip via the side extension portion.

[0017] Furthermore, the conductive spring sheet and the conductive strip are located on the same mounting surface, and a side of the side extension portion facing the tail of the conductive spring sheet has an inwardly inclined guide surface.

[0018] Technical effects:

[0019] The present invention proposes a new solution to solve the problem of insufficient elasticity and permanent deformation of the spring contact terminal of a small lamp due to long-term use. By cleverly arranging a spring structure in the plug-in frame, the present invention can automatically provide a strong resilience when the conductive spring is deformed. This design not only ensures continuous and effective contact between the conductive spring and the conductive strip, but also significantly improves the reliability and service life of the lamp.

[0020] In addition, the conductive spring has a simple structure, is easy to manufacture and install, and greatly reduces production costs. The present invention not only solves the existing problems of the prior art, but also has high practicality and economy, bringing new ideas and technical breakthroughs to the design and production of small lamps.

[0021] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the elastic contact terminal at the end of the lamp of the present invention.

[0023] Figure 2 yes Figure 1 Schematic diagram of the internal structure of the lamp.

[0024] Figure 3 It is a schematic structural diagram of the elastic contact terminal of the present invention.

[0025] Figure 4 yes Figure 3 Schematic diagram of the explosion structure.

[0026] Figure 5 It is a schematic diagram of the longitudinal cross-sectional structure of an embodiment of the lamp of the present invention.

[0027] Figure 6 It is a schematic diagram of the bottom structure of the lamp of the present invention.

[0028] Wherein: 100 elastic contact terminal, 1 plug-in frame, 11 substrate, 12 mounting wall, 13 spacing ribs, 14 front baffle, 15 plug-in strip, 16 buckle, 17 limit block, 2 conductive spring piece, 21 card connector, 211 inner recess, 212 avoidance groove, 213 guide slope, 22 fixed part, 23 movable part, 24 support foot, 25 side extension part, 3 elastic element, 31 bending part, 32 support foot, 33 movable foot, 4 cover plate, 41 horizontal bar, 5 circuit, 51 LED chip, 6 conductive strip, 7 lampshade, 8 partition, 1000 lamp, 200 shell, 201 bottom surface, 202 side wall, 203 assembly slot, 204 card interface. DETAILED DESCRIPTION

[0029] The present invention provides a flexible contact terminal at the end of a lamp 1000, which includes a plug-in frame 1, such as Figure 1 As shown, it is suitable for being connected to the end of the housing 200 of the lamp 1000. The housing 200 extends in the length direction and has an opening at the end. The elastic contact terminal 100 of the present invention is connected to the housing 200. The plug-in frame 1 has the same extension direction as the lamp housing. Conductive springs 2 are arranged at intervals in the plug-in frame 1. The conductive springs 2 extend in the length direction of the housing 200. The length of the conductive springs 2 is greater than the length of the plug-in frame 1 and includes a card connector 21 exposed from the plug-in frame 1. The conductive springs 2 are used for connecting positive and negative circuits. Generally, two are provided. Further, in order to be arranged at intervals in the plug-in frame 1 to meet electrical isolation, the card connectors 21 of the two conductive springs 2 are provided to be able to open and close relatively, as shown in FIG. Figure 2 The inner side of the card connector 21 is in contact with the elastic element 3, and the deformation recovery force of the elastic element 3 makes the card connector 21 have a tendency to open outward. According to the above structure, when the ends of the elastic contact terminal 100 of the present invention are interconnected, the card connector 21 opens outward to achieve a stable interconnection with other external shell structures of the same type.

[0030] The conductive spring piece 2 includes a fixed part 22 and a movable part 23. The fixed part 22 is fixedly installed with the plug-in frame 1. The movable part 23 is connected between the fixed part 22 and the card connector 21 along the length direction. The movable gap of the movable part 23 is set on the plug-in frame 1 so that the movable part 23 can swing along the width direction. The conductive spring piece 2 has resilience and can be bent and deformed. After the two conductive spring pieces 2 are installed, under the external force acting inward, the two movable parts 23 swing inward, so that the card connector 21 connected to the front end thereof moves inward, and its radial width is reduced, which is convenient for installation; then, under the restoring force of the elastic element 3, the card connector 21 opens outward, driving the two movable parts 23 to swing outward. According to this, the two conductive spring pieces 2 move on different sides along their installation plane. Preferably, the card connector 21 moves laterally and telescopically along the width direction with the swing of the movable part 23.

[0031] like Figure 3 and Figure 4 The schematic diagram of the structure of the elastic contact terminal is shown. The plug-in frame 1 includes a base plate 11 and a mounting wall 12, wherein the base plate 11 is arranged to extend transversely along the length direction of the housing 200 and is suitable for mounting the conductive spring sheet 2. The mounting wall 12 is vertically arranged on both sides of the base plate 11 and is matched and connected to the inner side of the housing 200. The base plate 11 is protrudingly provided with a spacing rib 13, which extends along the length of the housing 200 to separate the mounting space on the base plate 11. The two conductive spring sheets 2 are respectively mounted on different sides of the spacing rib 13 and positioned between the spacing rib 13 and the mounting wall 12. The elastic element 3 abuts between the spacing rib 13 and the conductive spring sheet 2.

[0032] The two clamping joints 21 are formed with inner recesses 211 on opposite sides along the width direction, and the elastic element 3 abuts against the inner recesses 211 to make the clamping joints 21 open outwardly. At the same time, the inner recesses 211 provide a space for a part of the structure of the elastic element 3 to be positioned therein, so that the elastic element 3 will not be disengaged when it moves. At the same time, an escape groove 212 is formed extending from the inner recess 211 in a direction away from the end of the clamping joint 21, and the escape groove 212 provides a space for accommodating the elastic element 3 when the elastic element 3 is compressed and deformed. When the elastic element 3 is compressed and deformed by force, a part of it is stuck in the inner recess 211, and the extended part is deformed and telescopically displaced in the escape groove 212.

[0033] In a specific embodiment of the present invention, the elastic element 3 is configured as an elongated metal part, in particular, it can be selected as a metal strip or a metal wire. The middle part of the elastic element 3 includes a bending portion 31, which is in contact with the inner recess 211 of the clamping joint 21 when in use. One end of the elastic element 3 is a support foot 32, which is configured to form a support point in the plug-in frame 1, and the other end is a movable foot 33, which is configured to move in the avoidance groove 212 as the elastic element 3 is elastically deformed and extended. The elastic element 3 is configured to be able to be opened under force and has a tendency to bring the two ends close under the deformation recovery force. For the elastic element 3 with a bending structure, it is deformed and stretched when it is under force. When installed on the inner side of the clamping joint 21, the support foot 32 is against the front end of the substrate 11, and the bending portion 31 is embedded in the inner recess 211 of the clamping joint 21. As it is deformed and extended, one side of the movable foot 33 moves in a direction away from the support foot 32, so that the elastic element 3 tends to be opened, and the avoidance groove 212 provides a movable space for the movable foot 33. Under the elastic restoring force, the elastic element 3 tends to return to the original bent state, and the movable leg 33 approaches the supporting leg 32, and at the same time, the bent portion 31 of the elastic element 3 is arched to make the clamping joint 21 extend outward.

[0034] The avoidance groove 212 includes one or more inclined surfaces extending from the clamping joint 21 to the fixed portion 22, so that the radial dimension of the movable portion 23 is smaller than the fixed portion 22 and can swing within the space provided by the substrate 11, while also allowing the movable foot 33 of the elastic element 3 to have room for extension.

[0035] In addition, the plug-in frame 1 also includes a cover plate 4, which is matched with the base plate 11 to form a storage space for isolating two conductive springs 2 respectively, and provides a support point for the elastic element 3. After the cover plate 4, the base plate 11 and the spacing rib 13 are matched, a group of conductive springs 2 and elastic elements 3 are respectively accommodated on both sides of the spacing rib 13. The front end of the base plate 11 has an upright front baffle 14, and the end of the spacing rib 13 is provided with an installation gap corresponding to the front baffle 14. The front end of the bottom side of the cover plate 4 extends downward with a horizontal bar 41. When the cover plate 4 is covered, the horizontal bar 41 is embedded between the front baffle 14 and the spacing rib 13, so that the two are tightly fitted, and an exposed opening suitable for the telescopic movement of the card connector 21 is formed between the front baffle 14 and the installation wall 12.

[0036] According to the above elastic contact terminal, the present invention further provides a strip lamp 1000, such as Figure 5 As shown, the lamp 1000 includes a bar-shaped housing 200, and an opening is provided at the end of the housing 200 along the length direction. A bar-shaped circuit board 5 is fixedly mounted in the housing 200, and the aforementioned elastic contact terminal 100 is installed along the end of the housing 200. The conductive spring 2 is electrically connected to the circuit board 5 in the housing 200, and the card connector 21 is exposed outside the housing 200 for external interconnection. Further, the tail of the conductive spring 2 includes a leg 24 extending in the housing 200 along the length direction, and the leg 24 of each conductive spring 2 extends outside the base plate 11 of the plug-in frame 1, and the ends of each leg 24 are respectively embedded in the connection holes on the circuit board 5, and then the leg 24 is electrically connected to the positive and negative lines of the circuit board 5.

[0037] like Figure 1 The housing 200 includes a bottom surface 201 and two side walls 202. The bottom surface 201 and the side walls 202 are integrally formed. An assembly groove 203 is provided on the inner side of the side wall 202. A plug-in strip 15 adapted to the assembly groove 203 is provided on the outer side of the plug-in frame 1. One or more plug-in strips 15 can be provided along the outside of the mounting wall 12 on each side. In addition, a base with a certain strength is adaptively sleeved on the outside of the housing 200 or can be installed in a track. In one embodiment of the present invention, the assembly groove 203 on each side includes a wire groove, and a conductive strip 6 is installed along the wire groove in the housing 200. The middle part of the conductive spring sheet 2 includes a side extension portion 25 extending laterally to expose the plug-in frame 1. After the plug-in frame 1 is assembled, the conductive spring sheet 2 on each side is electrically connected to the conductive strip 6 through the side extension portion 25, so that the lamps can be powered through the conductive strip 6 when the lamps are cascaded.

[0038] The lamp of the present invention is suitable for interconnecting multiple lamps of the same type. When the lamps are interconnected, since a part of the elastic contact terminal 100 of the lamp is located outside the housing 200, it can be electrically contacted with the conductive strip 6 in another lamp through the exposed card connector 21. When one of the lamps is powered on, all the lamps cascaded with it can be powered, thereby achieving conduction. Furthermore, the lateral extension length of the card connector 21 for power supply is equivalent to the lateral extension portion 25, so that good electrical contact is achieved with the conductive strips 6 at the same spacing distance.

[0039] Figure 6 The bottom structure of the lamp is shown, and the lamp housing is blurred to show the components installed inside it. Further, a buckle 16 is provided at the bottom of the plug-in frame 1, and a card interface 204 adapted to the buckle 16 is provided on the bottom surface 201 of the housing 200 to maintain a stable connection after assembly, and a limit block 17 is optionally provided at the bottom of the plug-in frame 1. After the plug-in frame 1 and the housing 200 are assembled, the limit block 17 abuts against the outside of the housing 200 to further prevent the relative movement of the two.

[0040] The conductive spring piece 2 is installed and extended on the plug-in frame 1. Specifically, along the length direction, a base plate 11 is extended on the plug-in frame 1. The base plate 11 is provided with gap ribs. The fixing portion 22 in the middle of the conductive spring piece 2 is installed between the gap ribs and the mounting wall 12. Optionally, the width of the fixing portion 22 is equivalent to the gap width of the gap ribs and the mounting wall 12, so that the conductive spring piece 2 can be clamped therebetween. Both ends of the base plate 11 along the length direction extend outside the mounting wall 12, and the clamping joint 21 and the side extension portion 25 extend laterally. Preferably, the clamping joint 21 and the side extension portion 25 extend outward from the front and rear end surfaces of the mounting wall 12 along the length direction, so that the conductive spring piece 2 clamps the mounting wall 12, and the forward and backward movement of the conductive spring piece 2 on the plug-in frame 1 is limited.

[0041] Preferably, the conductive spring sheet 2 and the conductive strip 6 are located on the same mounting surface, and the side of the side extension portion 25 facing the tail of the conductive spring sheet 2 has an inwardly inclined guide surface, and the conductive spring sheet 2 and the conductive strip 6 are guided to abut against each other by the guide surface when the plug-in frame 1 is assembled. The circuit board 5 is installed along the assembly slot 203 of the housing 200, and may not be located on the same mounting surface as the conductive spring sheet 2, and the legs 24 of the conductive spring sheet 2 are bent and then inserted into the circuit board 5.

[0042] An LED chip 51 is mounted on the circuit board 5 of the lamp 1000. The lamp 1000 further includes a lampshade 7 arranged in the light emitting direction of the LED chip 51. Optionally, the lampshade 7, the side wall 202 and the bottom surface 201 are integrally formed to form a housing 200. A partition 8 is provided at the end of the housing 200 to isolate the circuit board 5 from the outside. Optionally, a mounting column is provided on the partition 8, which is matched with the mounting hole at the end of the circuit board 5, so that the partition 8 is fixedly mounted relative to the circuit board 5.

[0043] When in use, in order to facilitate docking and interconnection, a guide bevel 213 is provided at the end of the card connector 21, so that when the elastic contact terminal 100 is plugged in, the guide bevel 213 is first squeezed inward by force, and the card connectors 21 on both sides shrink inward. After being installed in place, the card connector 21 remains open under the reset force of the elastic element 3, so that the conductive spring piece 2 can maintain a stable electrical connection when interconnected with the external lamp.

[0044] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An elastic contact terminal for the end of a lamp, comprising a plug-in frame (1), which is suitable for being connected to the end of a housing (200) of the lamp, and two conductive springs (2) are arranged at intervals in the plug-in frame (1), characterized in that: The conductive spring sheet (2) extends along the length direction of the housing (200); the length of the conductive spring sheet (2) is greater than the length of the plug-in frame (1) and comprises a card connector (21) exposed from the plug-in frame (1); the card connectors (21) of the two conductive spring sheets (2) are arranged to be relatively movable in opening and closing; the inner sides of the card connectors (21) facing each other are abutted against elastic elements (3); and the deformation restoring force of the elastic element (3) causes the card connectors (21) to have a tendency to open outwards.

2. The elastic contact terminal according to claim 1, characterized in that: The conductive spring sheet (2) comprises a fixed portion (22) and a movable portion (23); the fixed portion (22) is fixedly mounted in cooperation with the plug-in frame (1); the movable portion (23) is connected between the fixed portion (22) and the card connector (21) along the length direction; and a movable gap of the movable portion (23) is provided on the plug-in frame (1) so that the movable portion (23) can swing along the width direction.

3. The elastic contact terminal according to claim 1, characterized in that: The plug-in frame (1) comprises a base plate (11) and a mounting wall (12), wherein the base plate (11) is extended along the length direction of the housing (200), the conductive spring sheet (2) is adaptively mounted on the base plate (11), and the mounting wall (12) is vertically arranged on both sides of the base plate (11) and is matched and connected to the inner side of the housing (200).

4. The elastic contact terminal according to claim 3, characterized in that: A spacing rib (13) is protrudingly provided on the base plate (11), the spacing rib (13) extending along the length of the shell (200), two conductive spring sheets (2) are respectively installed on different sides of the spacing rib (13) and positioned between the spacing rib (13) and the mounting wall (12), and the elastic element (3) is abutted between the spacing rib (13) and the conductive spring sheet (2).

5. The elastic contact terminal according to claim 1, characterized in that: The two clamping joints (21) are formed with inner recesses (211) on opposite sides along the width direction, and the elastic element (3) abuts against the inner recesses (211) to cause the clamping joint (21) to open outward; an escape groove (212) is formed extending from the inner recesses (211) in a direction away from the end of the clamping joint (21), and is configured to provide a storage space for the elastic element (3) when the elastic element (3) is compressed and deformed.

6. The elastic contact terminal according to claim 5, characterized in that: The middle part of the elastic element (3) includes a bent portion (31) configured to abut against the inner recess (211) of the card joint (21); one end of the elastic element (3) is a supporting foot (32) configured to form a supporting point in the plug-in frame (1); the other end is a movable foot (33) configured to move in the avoidance groove (212) with the elastic deformation of the elastic element (3); the elastic element (3) is configured to be able to be opened under force and has a tendency to make the movable foot (33) approach the end of the supporting foot (32) under the deformation recovery force.

7. The elastic contact terminal according to claim 5, characterized in that: The avoidance groove (212) comprises one or more inclined surfaces extending from the clamping joint (21) toward the fixed portion (22), so that the radial dimension of the movable portion (23) is smaller than that of the fixed portion (22).

8. The elastic contact terminal according to claim 1, characterized in that: The plug-in frame (1) also includes a cover plate (4), which cooperates with the base plate (11) to cover and form a receiving space for isolating two conductive spring sheets (2) respectively, and at the same time provides a support point for the elastic element (3).

9. A strip-shaped lamp, comprising a strip-shaped housing (200), wherein the housing (200) is provided with an opening at an end along the length direction, and a circuit board (5) is fixedly mounted inside the housing (200), characterized in that: An elastic contact terminal as claimed in any one of claims 1 to 8 is installed along the end of the shell (200), the conductive spring (2) is electrically connected to the circuit board (5) inside the shell (200), and the card connector (21) is exposed outside the shell (200).

10. The strip light fixture according to claim 1, characterized in that: The tail of the conductive spring sheet (2) comprises a support leg (24) extending in the housing (200) along the length direction, and the end of the support leg (24) of each conductive spring sheet (2) is respectively embedded in a connection hole on the circuit board (5) to be electrically connected to the positive and negative lines of the circuit board (5).

11. The strip light fixture according to claim 10, characterized in that: The housing (200) comprises a bottom surface (201) and two side walls (202), an assembly groove (203) is arranged on the inner side of the side wall (202), a plug-in strip (15) adapted to the assembly groove (203) is arranged on the outer side of the plug-in frame (1), the assembly groove (203) on each side comprises a wire groove, a conductive strip (6) is arranged along the wire groove in the housing (200), the middle part of the conductive spring sheet (2) comprises a side extension portion (25) extending laterally and exposing the plug-in frame (1), and after the plug-in frame (1) is assembled, the conductive spring sheet (2) on each side is electrically connected to the conductive strip (6) via the side extension portion (25).

12. The strip light fixture according to claim 11, characterized in that: The conductive spring sheet (2) and the conductive strip (6) are located on the same mounting surface, and a side of the side extension portion (25) facing the tail of the conductive spring sheet (2) has an inwardly inclined guide surface.

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