CN114628180A - Carbon film structure for printed circuit board - Google Patents
Carbon film structure for printed circuit board Download PDFInfo
- Publication number
- CN114628180A CN114628180A CN202210338698.2A CN202210338698A CN114628180A CN 114628180 A CN114628180 A CN 114628180A CN 202210338698 A CN202210338698 A CN 202210338698A CN 114628180 A CN114628180 A CN 114628180A
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- CN
- China
- Prior art keywords
- carbon film
- cylinder
- strip
- rectangular
- printed circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/181—Printed circuits structurally associated with non-printed electric components associated with surface mounted components
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/12—Movable parts; Contacts mounted thereon
- H01H13/14—Operating parts, e.g. push-button
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Contacts (AREA)
Abstract
The utility model provides a carbon film structure for printed circuit board, including a first carbon film and a second carbon film, first carbon film includes a first cylinder, evenly distributed has at least six first rectangle strips along the circumferencial direction on the lateral wall of first cylinder, the second carbon film includes a second cylinder, second cylinder upper surface is provided with a through-hole, first carbon film sets up in the through-hole, evenly distributed has at least six second rectangle strips along the circumferencial direction on the lateral wall of through-hole, all constitute a logical groove between arbitrary two adjacent second rectangle strips, arbitrary one first rectangle strip all extends to a logical inslot. According to the PCB carbon film structure, the first rectangular strip and the second rectangular strip are distributed along the circumferential direction, and any one first rectangular strip extends into the through groove, so that even if the key is deviated and the conducting strip is inclined, the conducting strip can easily touch the first rectangular strip and the second rectangular strip at the same time no matter which side of the conducting strip is inclined at 360 degrees, and smoothness of signals is guaranteed.
Description
Technical Field
The invention relates to the physical field, in particular to a central control key for automobile air conditioning or sound entertainment, and particularly relates to a carbon film structure for a printed circuit board.
Background
The carbon film structure is a key structure which is used for conducting a circuit and transmitting signals on a PCB (printed circuit board) board and is widely applied to the central control field of air conditioners, sound entertainment and the like. As shown in fig. 1, the conventional carbon film structure 13 includes two carbon films disposed adjacent to each other, a key is disposed above the carbon films, a rubber pad and a conductive sheet are disposed at the bottom of the key, and when the key is pressed, the conductive sheet contacts the two carbon films to make the two carbon films constitute a circuit to be conducted, so that an output signal triggers the key function. Among the prior art, the carbon film on the PCB board adopts rectangle or C type, because the button is stepped on some position concentricity required precision and is very high, has the skew center when the button slightly, and the conducting strip below takes place the slope, will lead to the conducting strip slope of rubber pad stepping on some, and the area of contact of conducting strip and carbon film will reduce, and surface contact becomes line contact, and the conducting strip can only contact a carbon film, and the return circuit can not switch on, leads to the circuit break, does not have signal output, and the button is malfunctioning.
Disclosure of Invention
The invention aims to provide a carbon film structure for a printed circuit board, which aims to solve the technical problem that a carbon film structure loop cannot be conducted when a key is deviated in the prior art.
The invention relates to a carbon film structure for a printed circuit board, which comprises a first carbon film and a second carbon film, wherein the first carbon film comprises a first cylinder, the side wall of the first cylinder is evenly distributed with at least six first rectangular strips along the circumferential direction, any one first rectangular strip is arranged along the radial direction of the first cylinder, the second carbon film comprises a second cylinder, the upper surface of the second cylinder is provided with a through hole, the first carbon film is arranged in the through hole, the side wall of the through hole is evenly distributed with at least six second rectangular strips along the circumferential direction, any one second rectangular strip is arranged along the radial direction of the second cylinder, a through groove is formed between any two adjacent second rectangular strips, any one first rectangular strip extends into the through groove, and the first rectangular strips correspond to the through grooves one to one.
Furthermore, the number of the first rectangular strips and the number of the second rectangular strips are six.
Compared with the prior art, the invention has positive and obvious effect. According to the carbon film structure for the printed circuit board, the first rectangular strip and the second rectangular strip are distributed along the circumferential direction, and any one of the first rectangular strips extends into the through groove, so that even if the key is deviated, the conducting strip inclines, and no matter which side of the conducting strip inclines to 360 degrees, the conducting strip can easily touch the first rectangular strip and the second rectangular strip simultaneously, so that the first carbon film and the second carbon film form a loop, smoothness of signals is guaranteed, and influences caused by precision deviation are effectively reduced.
Drawings
FIG. 1 is a schematic diagram of the background art of the present invention.
FIG. 2 is a schematic diagram of a carbon film structure for a printed circuit board according to the present invention.
FIG. 3 is a schematic diagram of the usage of a carbon film structure for a printed circuit board according to the present invention.
FIG. 4 is a schematic diagram of a key shift state of a carbon film structure for a printed circuit board according to the present invention.
Detailed Description
The present invention will be further described with reference to the drawings and examples, but the present invention is not limited to the examples, and all similar structures and similar variations using the present invention shall fall within the scope of the present invention. The use of the directions of up, down, front, rear, left, right, etc. in the present invention is only for convenience of description and does not limit the technical solution of the present invention.
Example 1
As shown in fig. 1, 2, 3 and 4, a carbon film structure for a printed circuit board according to the present invention includes a first carbon film 1 and a second carbon film 2, the first carbon film 1 includes a first cylinder 3, at least six first rectangular strips 4 are evenly distributed on a sidewall of the first cylinder 3 along a circumferential direction, any one of the first rectangular strips 4 is disposed along a radial direction of the first cylinder 3, the second carbon film 2 includes a second cylinder 5, a through hole 6 is disposed on an upper surface of the second cylinder 5, the first carbon film 1 is disposed in the through hole 6, at least six second rectangular strips 7 are evenly distributed on a sidewall of the through hole 6 along the circumferential direction, any one of the second rectangular strips 7 is disposed along the radial direction of the second cylinder 5, a through groove 8 is formed between any two adjacent second rectangular strips 7, any one of the first rectangular strips 4 extends into one of the through grooves 8, the first rectangular strips 4 correspond to the through grooves 8 one to one.
Furthermore, the number of the first rectangular strips 4 and the second rectangular strips 7 is six.
The working principle of the embodiment is as follows:
during the use, with this carbon film structural mounting on PCB board 9, PCB board 9 is used for arranging the circuit, first carbon film 1 and second carbon film 2 top are provided with button 10, button 10 bottom is provided with rubber pad 11, rubber pad 11 downside is provided with conducting strip 12, because first rectangle strip 4 and second rectangle strip 7 distribute along the circumferencial direction, and arbitrary first rectangle strip 4 all extends to a logical inslot 8, consequently even there is the off normal button 10, conducting strip 12 takes place the slope, no matter conducting strip 12 inclines to 360 any side, also can touch first rectangle strip 4 and second rectangle strip 7 simultaneously very easily, make first carbon film 1 and a second carbon film 2 constitute the return circuit, guarantee the unblocked of signal, reduce the influence that the precision deviation brought effectively.
Claims (2)
1. A carbon film structure for a printed circuit board, characterized by: the carbon film comprises a first carbon film (1) and a second carbon film (2), wherein the first carbon film (1) comprises a first cylinder (3), the side wall of the first cylinder (3) is evenly distributed with at least six first rectangular strips (4) along the circumferential direction, any one first rectangular strip (4) is arranged along the radial direction of the first cylinder (3), the second carbon film (2) comprises a second cylinder (5), the upper surface of the second cylinder (5) is provided with a through hole (6), the first carbon film (1) is arranged in the through hole (6), the side wall of the through hole (6) is evenly distributed with at least six second rectangular strips (7) along the circumferential direction, any one second rectangular strip (7) is arranged along the radial direction of the second cylinder (5), a through groove (8) is formed between any two adjacent second rectangular strips (7), any one first rectangular strip (4) extends into the through groove (8), the first rectangular strips (4) correspond to the through grooves (8) one by one.
2. A carbon film structure for a printed circuit board according to claim 1, characterized in that: the number of the first rectangular strips (4) and the number of the second rectangular strips (7) are six.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210338698.2A CN114628180A (en) | 2022-04-01 | 2022-04-01 | Carbon film structure for printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210338698.2A CN114628180A (en) | 2022-04-01 | 2022-04-01 | Carbon film structure for printed circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114628180A true CN114628180A (en) | 2022-06-14 |
Family
ID=81906630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210338698.2A Pending CN114628180A (en) | 2022-04-01 | 2022-04-01 | Carbon film structure for printed circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114628180A (en) |
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2022
- 2022-04-01 CN CN202210338698.2A patent/CN114628180A/en active Pending
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| PB01 | Publication | ||
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