Composite layer combination structure of metal elastic sheet conducting film
By introducing guide rods and auxiliary springs into the composite layer combination structure of the metal shrapnel conductive film, the insensitive problem caused by the tilt of the key cap is solved, and a more stable key response is achieved.
Patent Information
- Application Number
- CN202420879262.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-25
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-25
AI Technical Summary
The existing metal shrapnel conductive films are prone to cause the key cap to tilt during use, and the metal shrapnel cannot be completely pressed, resulting in insensitive buttons.
The composite layer combination structure of metal shrapnel conductive film is adopted, including a fixing member, an auxiliary spring and a guide rod. The sliding connection between the guide rod and the groove is achieved to achieve the limiting function of the key cap, and the auxiliary spring is used to uniformly apply force to the key cap.
It effectively avoids the problems of key cap tilt and insensitive, ensures that the metal shrapnel can be completely under pressure, and improves the responsiveness and stability of the keys.
Smart Images
Figure CN222600808U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electronic products and automation thereof, and in particular relates to a composite layer combination structure of a metal spring conductive film. Background Art
[0002] Metal dome conductive film is a PET sheet containing metal domes (pot pieces), used as a switch on circuit boards such as PCB or FPC, and plays an important role as a tactile switch between the user and the instrument.
[0003] At present, the existing metal dome conductive film is generally used in the circuit of the key switch, and the purpose of controlling the on and off of the circuit is achieved by pressing. However, most keys with metal dome conductive film have the keycap tilted during the process of pressing the keycap, resulting in the keycap being unable to fully press the metal dome, resulting in the key being insensitive, which is not conducive to continuous use. For this reason, we propose a composite layer combination structure of metal dome conductive film. Utility Model Content
[0004] The purpose of the utility model is to provide a composite layer structure of a metal spring conductive film to solve the existing problems raised in the above background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a composite layer combination structure of a metal spring conductive film, comprising a fixing part, an auxiliary spring and a guide rod, the fixing part is provided with an installation groove, the installation groove is provided with a circuit layer, the top periphery of the fixing part is provided with a downward pressing groove, the top of the fixing part is movably connected with a keycap, the bottom periphery of the keycap extends to the inside of the downward pressing groove, the bottom outer peripheral surface of the keycap is provided with a groove, the inside of the groove is slidably connected with a guide rod, the bottom of the guide rod is fixedly connected to the bottom surface of the downward pressing groove, the outer periphery of the guide rod is provided with an auxiliary spring, and the two ends of the auxiliary spring are respectively fixedly connected to the bottom of the keycap and the bottom surface of the downward pressing groove.
[0006] Preferably, a protrusion is provided on the outer periphery of the bottom end of the key cap, a limiting groove is provided on the inner outer ring surface of the lower pressing groove, and the protrusion extends to the inside of the limiting groove and is slidably connected to the inner wall thereof.
[0007] Preferably, a metal spring conductive film is provided on the surface of the circuit layer inside the mounting groove, and a metal spring is provided inside the metal spring conductive film.
[0008] Preferably, a separation layer is provided on the top of the metal dome conductive film, the separation layer is fixedly covered on the top surface of the metal dome conductive film, and the separation layer is made of insulating material.
[0009] Preferably, a rubber coating layer is provided inside the key cap, and the key cap is fixedly connected to the separation layer on the top of the metal dome conductive film through the rubber coating layer.
[0010] Preferably, a back adhesive layer is provided at the bottom of the circuit layer, and the circuit layer is fixedly mounted to the inner bottom surface of the mounting groove through the back adhesive layer.
[0011] Compared with the prior art, the beneficial effects of the utility model are:
[0012] 1. By using the guide rod and the groove, a good limiting effect can be achieved during the pressing process of the keycap, which can prevent the keycap from tilting, thereby causing uneven force on the metal spring and insensitivity. It can also prevent the keycap from tilting and getting stuck with the inner wall of the pressing groove when the keycap is pressed down.
[0013] 2. The auxiliary spring on the outer periphery of the guide rod is used to evenly apply force to the keycap, so that after being pressed, the bottom of the keycap can be lifted up at the same time to avoid uneven restoring force exerted by the metal shrapnel on the keycap, causing the keycap to tilt and thus jam. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0015] Figure 2 This is a schematic diagram of the internal structure of the fixing member of the utility model;
[0016] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model.
[0017] In the figure: 1. fixing part; 2. mounting groove; 3. adhesive layer; 4. circuit layer; 5. pressing groove; 6. limiting groove; 7. metal spring conductive film; 8. metal spring; 9. partition layer; 10. key cap; 11. auxiliary spring; 12. groove; 13. guide rod; 14. protrusion; 15. adhesive layer. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0019] See also Figure 1-3The utility model provides a technical solution for the composite layer combination structure of a metal spring conductive film: it includes a fixing part 1, an auxiliary spring 11 and a guide rod 13, the fixing part 1 is provided with a mounting groove 2, the mounting groove 2 is provided with a circuit layer 4, the top periphery of the fixing part 1 is provided with a pressing groove 5, the top of the fixing part 1 is movably connected with a keycap 10, the bottom periphery of the keycap 10 extends to the inside of the pressing groove 5, the bottom periphery of the keycap 10 is provided with a groove 12, the inside of the groove 12 is slidably connected with a guide rod 13, the bottom of the guide rod 13 is fixedly connected to the bottom surface of the pressing groove 5, the outer periphery of the guide rod 13 is sleeved with an auxiliary spring 11, and the two ends of the auxiliary spring 11 are respectively fixedly connected to the bottom of the keycap 10 and the bottom surface of the pressing groove 5.
[0020] Specifically, a protrusion 14 is provided on the outer periphery of the bottom end of the key cap 10 , a limiting groove 6 is provided on the inner outer ring surface of the lower pressing groove 5 , and the protrusion 14 extends to the inside of the limiting groove 6 and is slidably connected to the inner wall thereof.
[0021] Specifically, a metal spring conductive film 7 is disposed on the surface of the circuit layer 4 inside the mounting groove 2 , and a metal spring 8 is disposed inside the metal spring conductive film 7 .
[0022] Specifically, a separation layer 9 is disposed on the top of the metal spring conductive film 7 . The separation layer 9 is fixedly covered on the top surface of the metal spring conductive film 7 . The separation layer 9 is made of insulating material.
[0023] Specifically, a rubber coating layer 15 is disposed inside the key cap 10 , and the key cap 10 is fixedly connected to the separation layer 9 on the top of the metal dome conductive film 7 through the rubber coating layer 15 .
[0024] Specifically, a back adhesive layer 3 is provided at the bottom of the circuit layer 4 , and the circuit layer 4 is fixedly mounted on the inner bottom surface of the mounting groove 2 through the back adhesive layer 3 .
[0025] In this embodiment, a groove 12 is provided on the bottom periphery of the key cap 10, and a guide rod 13 is provided in the pressing groove 5 on the top periphery of the fixing member 1, and the guide rod 13 is inserted into the inside of the groove 12, and the sliding connection between the guide rod 13 and the groove 12 is utilized to limit the key cap 10, so that when it is pressed down, the vertical sliding between the guide rod 13 and the groove 12 can be utilized to realize the limiting function of the key cap 10 during the pressing process, so that the key cap 10 can be stably pressed down vertically to avoid tilting, which causes the metal spring sheet 8 to be unable to be fully pressed, resulting in the key being insensitive, and cooperates with the guide rod 13 The auxiliary spring 11 on the periphery exerts uniform force on the keycap 10, so that after being pressed, the bottom of the keycap 10 can be lifted up at the same time to avoid uneven restoring elastic force applied by the metal spring 8 to the keycap 10, which causes the keycap 10 to tilt and get stuck, resulting in the keycap 10 being unable to reset. The limit groove 6 and the protrusion 14 are used to limit the keycap 10 to avoid the bottom of the keycap 10 from separating from the downward pressing groove 5, resulting in the bottom of the keycap 10 and the top edge of the downward pressing groove 5 being intertwined, causing the keycap 10 to get stuck when it is used again, effectively ensuring the stable use of the keycap 10.
[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A composite layer structure of a metal spring conductive film, comprising a fixing member, an auxiliary spring and a guide rod, characterized in that: The fixing part is provided with an installation groove inside, a circuit layer is arranged inside the installation groove, a downward pressing groove is provided on the top periphery of the fixing part, a keycap is movably connected to the top of the fixing part, the bottom periphery of the keycap extends to the inside of the downward pressing groove, a groove is provided on the bottom peripheral surface of the keycap, a guide rod is slidably connected to the inside of the groove, the bottom of the guide rod is fixedly connected to the bottom surface of the downward pressing groove, an auxiliary spring is sleeved on the outer periphery of the guide rod, and both ends of the auxiliary spring are respectively fixedly connected to the bottom of the keycap and the bottom surface of the downward pressing groove.
2. The composite layer structure of the metal spring conductive film according to claim 1, characterized in that: A protrusion is arranged on the outer periphery of the bottom end of the key cap, a limiting groove is arranged on the inner outer ring surface of the lower pressing groove, and the protrusion extends to the inside of the limiting groove and is slidably connected with the inner wall thereof.
3. The composite layer structure of metal spring conductive film according to claim 1, characterized in that: A metal spring conductive film is arranged on the surface of the circuit layer inside the mounting groove, and a metal spring is arranged inside the metal spring conductive film.
4. The composite layer structure of metal spring conductive film according to claim 1, characterized in that: A separation layer is arranged on the top of the metal dome conductive film. The separation layer is fixedly covered on the top surface of the metal dome conductive film and is made of insulating material.
5. The composite layer structure of metal spring conductive film according to claim 1, characterized in that: A rubber coating layer is arranged inside the key cap, and the key cap is fixedly connected to the separation layer on the top of the metal dome conductive film through the rubber coating layer.
6. The composite layer structure of metal spring conductive film according to claim 1, characterized in that: A back adhesive layer is provided at the bottom of the circuit layer, and the circuit layer is fixedly mounted on the inner bottom surface of the mounting groove through the back adhesive layer.