CN115863086A

CN115863086A - Thin film switch

Info

Publication number: CN115863086A
Application number: CN202211562023.2A
Authority: CN
Inventors: 李莹; 邓波; 张善睿; 张琳
Original assignee: Beigu Electronics Co ltd Shanghai Branch; Beigu Electronics Wuxi Co ltd; Luogu Technology Shanghai Co ltd; Beigu Electronics Co ltd
Current assignee: Beigu Electronics Co ltd Shanghai Branch; Beigu Electronics Wuxi Co ltd; Luogu Technology Shanghai Co ltd; Beigu Electronics Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-03-28

Abstract

The invention provides a membrane switch, which comprises a membrane, snap dome sheets, an indicator light and a PCBA; the film is provided with a key convex hull; the snap dome is made of a conductive material and provided with a light through hole, the initial shape is a convex shape, and the snap dome can restore to the initial shape after being pressed and deformed; the indicator light is arranged on the PCBA and is positioned between the metal dome and the PCBA; the snap dome is arranged between the button convex hull and the PCBA; the bottom of the snap dome is electrically connected with the first conductive component, and the light through hole is formed in the top of the snap dome; when the snap dome is pressed, the top of the snap dome moves towards the second conductive part until the snap dome is electrically connected with the second conductive part; when the top of the snap dome is electrically connected with the second conductive part, the illumination of the indicator light changes. The membrane switch provided by the invention has higher space utilization rate, and does not need to use special lighting equipment when being used in a dark environment.

Description

Thin film switch

Technical Field

The invention relates to the technical field of membrane switches, in particular to a membrane switch.

Background

Many construction machinery equipment are provided with controllers, for example, controllers are arranged on an aerial work platform and an aerial lift car, and man-machine interaction can be realized through the controllers. The surface of the controller is provided with a membrane switch, and the membrane switch is provided with a key and an indicator light.

The existing installation positions of the key and the indicator light are usually separated, and the key and the indicator light occupy a large space on the membrane switch. The indicating lamp is usually a monochromatic or multicolor LED (Light Emitting Diode) lamp, and the Light is transmitted through a round transparent window on the membrane switch for displaying the state of the key. Meanwhile, the key is provided with a key identification for indicating the key function. To ensure the readability of the key identification, the indicator light is much smaller than the keys, usually at the edge of the keys and takes up less space. The indicator light can only be used for indicating whether the button is in the state suggestion of function enable state, can not throw light on the button. For example, when the key is pressed, the indicator light is on, and the indicator light is on to indicate that the key is in a function enabling state; the indicator light is not on when the key is not pressed, and the indicator light is not on to indicate that the key is in a non-function enabling state. Therefore, in a dark environment, an operator can accurately find the position of the key by illuminating the key through special lighting equipment, and then operates the key according to the key identification on the key.

Disclosure of Invention

The invention provides a membrane switch, which aims to solve the technical problem that a key and an indicator lamp on the membrane switch are separately installed.

In order to solve the technical problem, the invention provides a membrane switch which comprises a membrane, snap pieces, an indicator light and a PCBA;

the film is provided with a key convex hull and is made of a light-transmitting material;

the snap dome is made of a conductive material, is provided with a light through hole, has a convex initial shape, and can restore to the initial shape after being pressed and deformed;

the indicator light is arranged on the PCBA positioned between the dome and the PCBA;

the PCBA is provided with a first conductive component and a second conductive component;

the snap dome is arranged between the key convex hull and the PCBA; the snap dome comprises a bottom and a top, the bottom of the snap dome is electrically connected with the first conductive part, and the light through hole is formed in the top of the snap dome; when the snap dome is not pressed, a gap is formed between the top of the snap dome and the second conductive component; when the metal dome is pressed, the top of the metal dome moves towards the second conductive component until the metal dome is electrically connected with the second conductive component; when the top of the snap dome is electrically connected with the second conductive component, the illumination of the indicator light changes.

Optionally, a key identifier is arranged on the key convex hull and is formed by printing of light-transmitting ink.

Optionally, the indicator light comprises at least two illumination intensities.

Optionally, the PCBA is a rigid circuit board, and a groove or a through hole is formed in the PCBA; the indicator light is LED lamp pearl, LED lamp pearl inlays the recess or in the through-hole.

Optionally, the PCBA is a flexible circuit board, a lower surface of the PCBA is bonded to a rigid base plate, and a groove or a through hole is formed in the rigid base plate; the indicator light is LED lamp pearl, LED lamp pearl inlays the recess or in the through-hole.

Optionally, the light-passing hole is arranged in the middle of the top of the snap dome, and the light-passing hole is circular.

Optionally, the indicator light is directly opposite to the light through hole, and an orthographic projection area of the indicator light on the light through hole is smaller than a cross-sectional area of the light through hole.

Optionally, the bottom of the snap dome includes four corners, and the four corners are electrically connected to the first conductive component respectively.

Optionally, each key mark is printed by light-transmitting ink with more than two colors.

Optionally, the device further comprises a day and night switching key or a photosensitive element, wherein the day and night switching key or the photosensitive element is electrically connected with the indicator light; the illumination mode of the indicator light comprises a low illumination mode and a high illumination mode, the day and night switch key or the photosensitive element is used for starting the low illumination mode in a dim environment, and the day and night switch key or the photosensitive element is also used for closing the low illumination mode in a non-dim environment; when the top of the snap dome is electrically connected with the second conductive member, the illumination mode of the indicator light is switched to the high illumination mode.

The membrane switch provided by the invention has the following beneficial effects:

1. the space utilization rate is higher: the existing membrane switch has the key and the indicator light which respectively occupy a certain installation space. The membrane switch of the invention combines a pressing part (the pressing part comprises a key convex hull and a snap dome) and the indicator lamp into a whole, the indicator lamp does not occupy independent installation space, the indicator lamp can be used as backlight display through the key convex hull, the space utilization rate is higher, and the structure is more compact.

2. When the device is used in a dim environment, no special lighting device is needed: when the existing membrane switch is used in a dark environment, the key can be accurately controlled only by illuminating the key by means of special lighting equipment. When the membrane switch provided by the invention is used in a dim environment, the light of the indicating lamp is scattered to the key convex hull through the light through hole on the dome sheet, so that the key convex hull is illuminated, and an operator can conveniently operate the membrane switch by means of the light of the indicating lamp without additional lighting equipment.

Drawings

Fig. 1 is a schematic structural diagram of a membrane switch according to an embodiment of the present invention.

Fig. 2 is an exploded view of a membrane switch according to an embodiment of the present invention.

[ reference numerals are described below ]:

film-1, metal dome-2, indicator light-3, PCBA-4;

key button convex hull-11;

key identification-111;

a light through hole-21, a bottom-22 and a top-23;

a first conductive member-41, a second conductive member-42, a groove-43.

Detailed Description

To make the objects, advantages and features of the present invention more apparent, a membrane switch according to the present invention will be described in detail with reference to the accompanying drawings. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

In the description of the present invention, the terms "first", "second", etc. are used for convenience of description and reference, but are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined by a qualifier such as "first," "second," etc., may explicitly or implicitly include one or more of that feature.

As shown in fig. 1 and 2, the present embodiment provides a membrane switch including a membrane 1, a dome 2, an indicator light 3, and a PCBA4 (Printed Circuit Board assembled Printed Circuit Board); the film 1 is provided with a key convex hull 11, and the film 1 is made of a light-transmitting material; the snap dome 2 is made of a conductive material, is provided with a light through hole 21, has a convex initial shape, and can restore to the initial shape after being pressed and deformed; the indicator light 3 is arranged on the PCBA4 and is positioned between the snap dome 2 and the PCBA 4; a first conductive member 41 and a second conductive member 42 are provided on the PCBA 4; the snap dome 2 is arranged between the key convex hull 11 and the PCBA 4; the metal dome 2 comprises a bottom part 22 and a top part 23, the bottom part 22 of the metal dome 2 is electrically connected with the first conductive part 41, and the light through hole 21 is arranged on the top part 23 of the metal dome 2; when the snap dome 2 is not pressed, a gap is formed between the top 23 of the snap dome 2 and the second conductive member 42; when the snap dome 2 is pressed, the top part 23 of the snap dome 2 moves towards the second conductive part 42 until being electrically connected with the second conductive part 42; when the top portion 23 of the snap dome 2 is electrically connected to the second conductive member 42, the illuminance of the indicator light 3 changes.

The film 1 may be made of a light-transmitting material such as PET (polyethylene terephthalate), PC (Polycarbonate), PVC (Polyvinyl chloride), and the like. The bending degrees of the metal dome 2 and the key convex hull 11 can be different, so that the metal dome 2 and the key convex hull 11 are not completely attached, a gap is formed between the metal dome 2 and the key convex hull 11, and light emitted by the indicating lamp 3 can illuminate the key convex hull 11 through the gap.

The membrane switch provided by the embodiment has the following beneficial effects:

1. the space utilization rate is higher: the existing membrane switch has a key and an indicator light which respectively and independently occupy certain installation space. The membrane switch in this embodiment unites two into one press part (press part including button convex closure 11 and snap dome 2) and pilot lamp 3, and pilot lamp 3 does not occupy solitary installation space, and pilot lamp 3 can see through button convex closure 11 as the demonstration of being shaded, and space utilization is higher, and the structure is compacter.

2. When used in dim environments, no special lighting equipment is needed: when the existing membrane switch is used in a dark environment, the key can be accurately controlled only by illuminating the key by means of special lighting equipment. When the membrane switch provided by the invention is used in a dim environment, the light of the indicating lamp 3 is scattered onto the key convex hull 11 through the light through hole 21 on the dome 2, so that the key convex hull 11 is illuminated, and an operator can conveniently operate the membrane switch by means of the light of the indicating lamp 3 without additional lighting equipment.

Optionally, as shown in fig. 1 and fig. 2, a key mark 111 is disposed on the key convex hull 11, and the key mark 111 is formed by printing with a light-transmitting ink. The membrane switch provided by the embodiment also has the following beneficial effects: the key identification 111 is more clear: the existing key identification is usually formed by printing opaque ink, and is opaque, so that the key identification is difficult to see clearly, and particularly, the key identification cannot be seen in a dark environment; the existing indicator lamp is usually a round small bright spot, and the color is not easy to distinguish and the key mark cannot be illuminated. The key identification 111 that this embodiment provided is formed by printing of printing ink, and key identification 111 is more clear and have the colour when pilot lamp 3 is lighted, and the hue of colour that the hue that key identification 111 shows is the same when lighting and not lighting, makes things convenient for operating personnel to look over.

Alternatively, as shown in fig. 1 and 2, the indicator lamp 3 includes at least two illumination intensities. Optionally, during the operation, if the key identifier 111 is in the non-function enabled state, the indicator light 3 may be in the low illumination mode, and the indicator light 3 is in the low brightness state; if the key identifier 111 is in the function enabled state, the indicator light 3 may be in the high illumination mode, and the indicator light 3 is in the high illumination state, which indicates that the function corresponding to the key identifier 111 is being enabled. Optionally, during the operation, if the key identifier 111 is in the non-function enabled state, the indicator light 3 may be in the high illumination mode, and the indicator light 3 is in the high illumination state; if the key identifier 111 is in the function enabled state, the indicator light 3 may be in the low illumination mode, and the indicator light 3 is in the low illumination state, which indicates that the function corresponding to the key identifier 111 is being enabled.

Optionally, as shown in fig. 2, the PCBA4 is a rigid circuit board, and a groove 43 or a through hole is provided on the PCBA 4; the indicator light 3 is an LED lamp bead which is embedded in the groove 43 or the through hole. The rigid printed board comprises phenolic aldehyde paper laminated board, epoxy paper laminated board, polyester glass felt laminated board, epoxy glass cloth laminated board and the like, and the rigidity of the rigid printed board is higher. The LED lamp beads are embedded in the grooves 43 or the through holes, so that the metal dome sheet 2 can be prevented from touching the indicator lamp 3 in the pressing process. In other embodiments, the indicator light 3 may also be another type of light.

Optionally, as shown in fig. 2, the PCBA4 is a flexible circuit board, a lower surface of the PCBA4 is bonded to a rigid base plate, and the rigid base plate is provided with a groove 43 or a through hole; the indicator light 3 is an LED lamp bead, and the LED lamp bead is embedded in the groove 43 or the through hole. The flexible circuit board is a printed circuit board with high reliability and high flexibility, which is usually made of polyimide or polyester film as a base material, and the rigid bottom plate can increase the hardness of the PCBA4 and protect the LED lamp beads.

Optionally, as shown in fig. 2, the upper surface of the LED lamp bead is flush with the upper surface of the PCBA 4. Therefore, the metal dome sheet 2 can be prevented from touching the LED lamp beads in the pressing process. In other embodiments, the upper surface of the LED lamp bead may also be slightly higher than the upper surface of the PCBA 4.

Optionally, as shown in fig. 2, the light-passing hole 21 is disposed in the middle of the top 23 of the snap dome 2, and the light-passing hole 21 is circular. This facilitates the processing of the light through hole 21 and allows the light of the indicator light 3 passing through the light through hole 21 to be uniformly scattered onto the key convex hull 11.

Optionally, as shown in fig. 2, the indicator light 3 faces the light through hole 21, and an orthographic projection area of the indicator light 3 on the light through hole 21 is smaller than a cross-sectional area of the light through hole 21. When the membrane switch is horizontally placed, the indicator light 3 is positioned under the light through hole 21, and the cross-sectional area of the light through hole 21 is slightly larger than the maximum cross-sectional area of the indicator light 3, so that the light transmission effect is better, and the key convex hull 11 and the key identification 111 can be brighter.

Alternatively, as shown in fig. 2, the bottom 22 of the snap dome 2 includes four corners, and the four corners are electrically connected to the first conductive parts 41, respectively. The bottom 22 of the snap dome 2 can be welded to the first conductive part 41 of the PBCA through the four corners, improving the firmness of the snap dome 2.

Optionally, as shown in fig. 2, the light-passing hole 21 is circular and is disposed in the middle of the snap dome 2, and a plurality of second contacts are disposed in the circumferential direction of the light-passing hole 21. The second contact can electrically connect the top part 23 of the dome 2 with the second conductive component 42 of the PBCA, and reduce the distance between the top part 23 of the dome 2 and the second conductive component 42 of the PBCA, thereby preventing the dome 2 from colliding with the indicator light 3 during the pressing process.

Alternatively, as shown in fig. 2, each of the key identifiers 111 is printed by more than two colors of light-transmitting ink. Therefore, the key identifier 111 can be colored, and operators can conveniently identify different key identifiers 111.

Optionally, as shown in fig. 1 and fig. 2, the areas of the back surface of the film 1 except for the key convex hulls 11 are all provided with a glue layer, and the film 1 is fixed on the surface of the PCBA4 through the glue layer. This facilitates the securing of the membrane 1 to the surface of the PCBA4 and ensures that the key domes 11 return to their original state when pressed.

Optionally, as shown in fig. 1 and 2, in order to improve the fit and handling of the adhesive layer, an insulating sheet may be added at the position of the adhesive layer between the film 1 and the PCBA 4. Other media may be added between the membrane 1 and the PCBA4, taking durability, electromagnetic interference, etc. into account.

Optionally, as shown in fig. 2, the light of the indicator light 3 is white. This allows the color of the key identification 111 to be displayed more accurately.

Optionally, referring to fig. 2, the membrane switch further comprises a day-night switching button or a light sensitive element, which is electrically connected with the indicator light 3; illumination of the indicator light 3

The level mode comprises a low light level mode and a high light level mode, the day and night switch button or the photosensitive element is used for 5 starting the low light level mode under dark environment, and the day and night switch button or the photosensitive element is also used for closing the low light level mode under non-dark environment; when the top portion 23 of the dome sheet 2 is electrically connected to the second conductive member 42, the illuminance mode of the indicator lamp 3 is switched to the high illuminance mode. The low-illumination mode is started in a dim environment, so that an operator can conveniently check the positions of the keys and press the keys

The key identifier 111, when the key convex hull 11 is pressed, the brightness of the indicator light 3 is increased, which indicates that the function corresponding to the key identifier 111 0 is in a function enabling state; when the key button convex hull 11 is not pressed,

the brightness of the indicator light 3 is low or not bright, which indicates that the function corresponding to the key identification 111 is in a non-function enabled state. In the low-illumination mode in which the indicator lamp 3 is turned off in a non-dim environment, when the key convex hull 11 is pressed, the brightness of the indicator lamp 3 is increased, so that the power consumption of the indicator lamp 3 can be saved.

In summary, the membrane switch provided by the invention has the following beneficial effects:

1. the space utilization rate is higher: the existing membrane switch has a key and an indicator light which respectively and independently occupy certain installation space. According to the membrane switch, the pressing part (the pressing part comprises the key convex hull 11 and the snap dome 2) and the indicating lamp 3 are combined into a whole, the indicating lamp 3 does not occupy an independent installation space, the indicating lamp 3 can be used for backlight display through the key convex hull 11, the space utilization rate is higher, and the structure is more compact.

02. When the device is used in a dim environment, no special lighting device is needed: when the existing membrane switch is used in a dark environment, the key can be accurately controlled only by illuminating the key by means of special lighting equipment. When the membrane switch provided by the invention is used in a dim environment, the light of the indicating lamp 3 is scattered onto the key convex hull 11 through the light through hole 21 on the dome 2, so that the key convex hull 11 is illuminated, and an operator can conveniently operate the membrane switch by means of the light of the indicating lamp 3 without additional lighting equipment.

53. The key identification 111 is more clear: existing key labels are typically printed from opaque ink,

the key identification is opaque, so that the key identification is difficult to see clearly, and particularly, the key identification is invisible in a dark environment; the existing indicator lamp is usually a round small bright spot, and the color is not easy to distinguish and the key mark cannot be illuminated. The key mark 111 provided by the invention is formed by printing transparent ink, the key mark 111 is clearer and has colors when the indicator lamp 3 is lightened, and the hue displayed by the key mark 111 is the same when the key mark is lightened and is not lightened, so that an operator can conveniently check the hue.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the present invention.

Claims

1. A membrane switch is characterized by comprising a membrane, a snap dome, an indicator light and a PCBA;

the snap dome is made of a conductive material and provided with a light through hole, the initial shape is a convex shape, and the snap dome can restore to the initial shape after being pressed and deformed;

the indicator light is arranged on the PCBA and is positioned between the snap dome and the PCBA;

2. The membrane switch of claim 1, wherein the key convex hull is provided with key marks, and the key marks are formed by printing light-transmitting ink.

3. The membrane switch of claim 2, wherein said indicator light comprises at least two illumination levels.

4. A membrane switch according to claim 1, wherein the PCBA is a rigid circuit board, and the PCBA is provided with recesses or through holes; the indicator light is LED lamp pearl, LED lamp pearl inlays the recess or in the through-hole.

5. A membrane switch according to claim 1, wherein the PCBA is a flexible circuit board, a lower surface of the PCBA is bonded to a rigid substrate, and the rigid substrate is provided with grooves or through holes; the indicator light is LED lamp pearl, LED lamp pearl inlays the recess or in the through-hole.

6. The membrane switch as claimed in claim 1, wherein the light passing hole is formed at a middle position of the top of the dome sheet, and the light passing hole has a circular shape.

7. The membrane switch according to claim 6, wherein said indicator light is directed toward said light-passing hole, and an orthographic area of said indicator light on said light-passing hole is smaller than a cross-sectional area of said light-passing hole.

8. The membrane switch of claim 1, wherein the bottom of said snap dome includes four corners, said four corners being electrically connected to said first conductive member, respectively.

9. A membrane switch according to claim 2, characterized in that each of said key designations is printed with light-transmissive inks of two or more colours.

10. A membrane switch according to claim 3, further comprising a day-night switch button or a light sensitive element, said day-night switch button or said light sensitive element being electrically connected to said indicator light; the illumination modes of the indicator light include a low illumination mode and a high illumination mode, the diurnal switching key or the photosensor is used to turn on the low illumination mode in a dim environment, the diurnal switching key or the photosensor is also used to turn off the low illumination mode in a non-dim environment; when the top of the snap dome is electrically connected with the second conductive member, the illumination mode of the indicator light is switched to the high illumination mode.