KR20090126078A - Key switch structure - Google Patents

Abstract

PURPOSE: A key switch structure is provided to reduce power consumption by allowing a light to be radiated on a key top without loss due to an obstacle on the route of the light. CONSTITUTION: In a key switch structure, an upper key(10) includes a display unit(11) and a sidewall extended from the surround of the display unit to a bottom of the display unit. A PCB(20) is installed under the upper key top and is installed on the light emitting device(21). A lower key top(30) is installed under the PCB and is installed on the sidewall of the upper key top, and a switch is operated by pressure of the upper key top and transmits the operation signal of key-top. The sidewall of the upper key top is inserted to the guide groove(22) by passing from the around of light emitting device and the PCB.

Description

Key switch structure {KEY SWITCH STRUCTURE}

The present invention relates to a key switch structure of a light emitting keyboard used for a computer, and more particularly, to a key switch structure used for a light emitting keyboard that illuminates a key top provided on an upper portion of a light emitting element by light generated from a light emitting element disposed below. It is about.

Background Art A key switch structure is known in which a light emitting device is installed on a bottom surface of a computer keyboard, an IPTV keyboard or a remote controller, and a light is emitted through a key top using the key switch component as a transparent material.

As shown in FIG. 8, the known key switch structure includes a PCB 910 in which an LED 911, which is a light emitting device, is installed in a keyboard base 900, and two contacts 921 are provided on an upper side of the PCB 910. The switch unit 920 is installed, and the upper side of the switch unit 920 is provided with a dome-shaped elastic restoring means 930 for restoring to the original position after pressing the switch, the elastic restoring means ( The base plate 940 is formed on the upper side of the 930, and is formed to include a key top 950 that moves up and down along the base plate 940.

In the key switch structure, the LED 911 which is a light emitting element is disposed at the bottom, and the key top 950 through which light is transmitted is disposed at the top, so that the light generated by the LED 911 can reach the key top 950. The part 920, the elastic restoring means 930, and the base plate are all made of a transparent or translucent material.

However, since the brightness, which is the brightness of the illumination, is inversely proportional to the square of the distance, the brightness is remarkably reduced even if the distance is increased a little. In this configuration, the distance d1 from the LED 911 to the keytop 950 is reduced. The farthest configuration has a disadvantage in that the intensity of light reaching the key top 950 is significantly reduced.

In addition, as the light generated by the LED 911 passes through the switch unit 920, the elastic restoring means 930, and the base plate 940, a large amount of light energy is generated, and thus the brightness of the light passing through the key top 950 is generated. There is a disadvantage that is further reduced.

In order to solve the lack of brightness, the key switch structure uses an expensive LED 911 having a higher brightness or increases the number of LEDs 911. However, this consumes a lot of power and emits light. There is a problem that the production cost is increased by increasing the cost of the LED (911), which takes a large part of the manufacturing cost of the keyboard for.

Disclosure of Invention The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide an efficient key switch structure capable of reducing power consumption required for key top lighting and at the same time reducing manufacturing costs.

The present invention is a key switch structure for use in a light emitting keyboard in which the key top is illuminated by a light emitting element provided at the bottom of the key top, in order to solve the above problems, a display portion for displaying characters and a lower portion formed around the display portion. An upper key top formed of a side wall portion, a PCB installed below the upper key top and a light emitting element mounted thereon, a lower key top installed on the lower side of the PCB and fixed to the side wall of the upper key top, and pressurized by the upper key top And a switch unit which is operated to transmit an operation signal of the key top, wherein the side wall portion of the upper key top is fixed to the lower key top through a guide groove formed to penetrate the PCB around the light emitting element in the PCB so that the display portion of the upper key top is fixed. The light emitting device is disposed adjacent to the light emitting device.

The key switch structure of the present invention is a key switch structure for use in a light emitting keyboard in which a key top is illuminated by a light emitting element provided below the key top, the key switch structure comprising: a display portion for displaying characters and a side wall portion extending downward from the periphery of the display portion; A lower key top including an upper key top, a PCB installed below the upper key top and a light emitting element mounted thereon, a side wall part disposed below the PCB and extending upward, and a bottom part formed flat on the side wall part; And a switch unit which is operated by pressing the upper key top to transmit an operation signal of the key top, and the other side wall part is accommodated in a receiving groove formed in one of the side walls of the upper key top and the side wall of the lower key top. An upper key top and a lower key top are fixed to each other, and sidewall portions of the upper key top are light emitting elements in the PCB. The display unit of the upper key top is positioned adjacent to the light emitting device by being fixed to the lower key top through a guide groove formed to penetrate the PCB around the ruler.

In the key switch structure of the present invention, a key switch structure used for a light emitting keyboard in which a key top is illuminated by a light emitting element provided below the key top, the key switch structure comprising: a display portion for displaying characters and a side wall portion extending downward from the periphery of the display portion; An upper key top formed with a groove having a cross-section along a horizontal inner circumference at a lower portion of the side wall, a PCB installed under the upper key top, and a light emitting device mounted thereon, and a lower key mounted on the groove; A lower key top comprising a flat bottom portion inserted into a fastening portion, and a switch portion connected by pressing the upper key top and electrically connected to a light emitting element, wherein the side wall portion of the upper key top connects the PCB around the light emitting element in the PCB. Table of the upper key top by being fixed to the lower key top through the guide groove formed to penetrate It characterized in that arranged adjacent the portion just above light emitting device.

In the key switch structure of the present invention, a lower opening groove is formed in the side wall portion of the upper key top to be opened downward, and a guide groove is not formed in the guide groove portion of the PCB corresponding to the portion where the lower opening groove is formed. By forming a bridge that is not part, the circuit inside and outside the guide groove in the PCB can be connected to each other through the bridge.

In the key switch structure of the present invention, an upper opening groove is formed on the side wall portion of the lower key top, and the guide groove portion of the PCB corresponding to the portion where the upper opening groove is formed is not formed with a guide groove. By forming a bridge, which is a part, circuits inside and outside the guide groove in the PCB can be connected to each other through the bridge.

In the key switch structure of the present invention, the inclined portion formed to be inclined upward is formed at the lowermost end of the side wall portion of the upper key top.

In the key switch structure of the present invention, the lower key top is provided with a rod-shaped pressing portion protruding downward, and the switch portion is a first contact pressed by the pressing portion and a second contact connected with the first contact. Characterized in that made.

In the key switch structure of the present invention, an elastic restoring means is provided between the lower key top and the switch unit to restore the key top moved downward when pressed.

In the key switch structure of the present invention, the elastic restoring means is a dome shape of an elastic material, and a protrusion is formed at a vertex portion of the dome shape, and the protrusion is disposed so as to be positioned on the vertical upper portion of the first vertex, and the upper surface of the protrusion is formed. The pressing portion of the lower key top is disposed so that, when pressing the key top, the protrusion presses the first contact and is connected to the second contact.

In the key switch structure of the present invention, a base plate is provided above the switch portion, and a receiving portion capable of accommodating the dome shape is formed at a portion where the dome-shaped elastic means is disposed in the base plate.

In the key switch structure of the present invention, the upper portion of the receiving portion is formed with a key top guide portion, the key top guide portion, extending in the longitudinal direction to accommodate the pressing portion, the hollow portion having a shape corresponding to the cross-sectional shape of the pressing portion therein Characterized in that formed.

In the key switch structure of the present invention, between the base plate and the PCB is characterized in that the PCB support is formed to protrude upward to support the PCB.

In the key switch structure of the present invention, a base plate is disposed on an upper surface of the switch unit, a seeder is installed between the lower key top and the base plate, and the seeder is formed by crossing the first link and being pivotally intersected at the center. It consists of two links, the through-hole for receiving the dome-shaped elastic restoring means is formed in the center of each of the first link and the second link, the upper end of the first link of the scissor is the bottom portion of the lower key top Is rotatably fixed to one side, the upper end of the second link is rotatably fixed to the other side opposite the bottom of the lower key top, the lower end of the first link is rotatably fixed to one side of the base plate, The lower end of the second link is rotatably fixed to the other side of the base plate.

In the key switch structure of the present invention, between the base plate and the PCB is characterized in that the PCB support is formed to protrude upward to support the PCB.

In the key switch structure of the present invention, the lower key top is formed with a rod-shaped pressing portion protruding downwardly, a spring is disposed below the pressing portion, a movable portion is installed below the spring, and the switch portion is pressurized It is characterized by consisting of a 1st contact pressed by the movable part moved by a part, and a 2nd contact connected with this 1st contact.

In the key switch structure of the present invention, between the base plate formed on the upper portion of the switch and the PCB is formed so as to protrude upward, characterized in that the PCB support for supporting the PCB is formed.

In the key switch structure of the present invention, the convex lens portion or the concave lens portion is formed on the bottom of the display portion of the upper key top.

According to the present invention, the light emitting device is positioned directly below the key top, and thus the light generated from the light emitting device is directly irradiated directly onto the key top without any intermediate obstacles.

Therefore, all of the light energy generated in the light emitting device can be used for the illumination of the key top without being lost by the intermediate obstacle, thereby basically having the advantage of reducing the power consumption used for light emission.

In addition, it is possible to further increase the brightness of the key top compared to the prior art without using an expensive light emitting device having brighter brightness or increasing the number of light emitting devices. By reducing the manufacturing cost of the keyboard has the advantage.

[First Embodiment]

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 is an exploded perspective view showing the key switch structure of the first embodiment of the present invention. Fig. 2 is a sectional view showing the key switch structure of the first embodiment of the present invention. Fig. 3 is a diagram showing a state in which the key switch structure of the first embodiment of the present invention operates.

The key switch structure according to the first embodiment of the present invention includes an upper key top 10, a PCB 20 installed below the upper key top 10 and having a light emitting element 21 disposed thereon, A lower key top 30 installed below and fixed to the upper key top 10, a base plate 40 supporting the lower key top 30, and a dome shape formed under the base plate 40. The elastic restoring means 50, the switch unit 60 is provided in the lower portion of the elastic restoring means 50, and the base 70 is disposed in the lower portion of the switch unit 60.

In the present invention, the key top is formed by fixing the upper key top 10 and the lower key top 30 separated from each other.

The upper key top 10 includes a display portion 11 made of a transparent or translucent material for transmitting light and displaying the contents of each key, and a side wall portion 12 formed perpendicular to the display portion 11. The side wall portion 12 is formed with a downward opening groove 13 which opens vertically downward.

A plurality of LEDs 21, which are light emitting elements, are formed in the PCB 20, and the sidewalls 12 and 32 of the upper and lower key tops 10 and 30 can penetrate around the LEDs 21, respectively. The guide groove 22 penetrating the 20 is formed. In the present invention, the PCB 20 is composed of only one PCB 20 for the entire plurality of key switch structure.

The guide groove 22 is formed to correspond to the vertical cross-sectional shape of the side wall portions 12 and 32 of the upper key top 10 and the lower key top 30, and the guide groove 22 is formed between the guide grooves 22. Since the bridge 23, which is not formed, is formed, electrical circuits inside and outside the guide groove in the PCB 20 are connected to each other.

The lower key top 30 is formed of a side wall portion 32 having an open groove 31 open upward, and a bottom surface portion 33 formed horizontally on the side wall portion 32. The pressing part 34 which protrudes and extends in rod shape is formed below.

An accommodating groove 34 extending downward is formed in the side wall part 32 of the lower key top 30, and a lower end of the side wall part 12 of the upper key top 10 is fixed to the accommodating groove 34. The upper key top 10 and the lower key top 30 are fastened.

On the other hand, the receiving groove 34 is not necessarily formed only in the lower key top 30, on the contrary may be formed to have a shape extending upward from the bottom portion 33 of the side wall portion 32 of the upper key top 10. .

Therefore, both of the upper keytop 10 and the lower keytop 30 are fixed in a state in which at least one LED 21 is included.

The base plate 40 is formed by protruding the horizontal portion 41 of the flat shape, and the upper portion of the horizontal portion 41, and has a shape corresponding to the dome-shaped elastic restoring means 50, the elastic restoring means 50 And a key top guide portion 43 in which a hollow portion 43a extending in the longitudinal direction therein is formed at the upper end of the accommodation portion 42.

Meanwhile, a PCB support part 44 for supporting the PCB 20 is formed between the PCB 20 and the base plate 40. The PCB support part 44 is composed of a plate-shaped member in the present embodiment, but is not limited thereto. Other configurations may be used as long as the PCB support part 44 may support a pillar shape or other PCB 20.

In addition, the PCB support 44 is formed integrally with the base plate 40 in this embodiment, but is not limited thereto, and may be separately formed and then fixed to the base plate 40.

The elastic restoring means 50 may be used as a known configuration to act to return the pressurized keytop back to the original position. In the present embodiment, the elastic restoring means 50 is a silicon material having elasticity, and has a dome shape, and a protrusion part 51 protruding downward is formed at the apex part of the dome shape, and the protrusion part 51 is the switch part 60. It is installed to be disposed above the vertical.

Switch unit 60 may be composed of a membrane switch unit consisting of three transparent polyester (PET) film of the upper film (60a), the intermediate film (60b), the lower film (60c), the upper film (60a) and the lower The contacts 61 are formed in the film 60c, respectively.

The present embodiment describes a contact method in which the switch unit directly contacts the two contacts 61, but is not limited thereto. The switch configuration may be configured to transmit information about a key pressed through the switch device to a controller (not shown). If it has, it can also be comprised by other methods, such as a contactless switch.

By connecting the switch unit 60, information such as letters and the like for the key is transmitted to a computer or the like.

In the first embodiment configured as described above, the LED 21, which is a light emitting device for illuminating the upper key top 10, is disposed directly below the display unit 11 of the upper key top 10, and thus the upper key top 10 and the light emission. The distance d2 from the LED 21, which is a device, is close to maximize the brightness while the LED 21 directly illuminates the upper key top 10 without any obstacle, thereby minimizing the loss of light energy. do.

In addition, in the case of pressing the upper key top 10, as shown in Figure 3, the rod-shaped pressing portion 34 of the lower key top 30 is guided by the key top guide key top 43 of the hollow park tubular downwards, Accordingly, the distance d3 between the display portion 11 of the upper key top 10 and the LED 21 is further reduced, and the lighting effect is further increased.

Second Embodiment

A second embodiment of the present invention will be described with reference to the drawings. Fig. 4 is an exploded perspective view showing the key switch structure of the second embodiment of the present invention. Fig. 5 is a sectional view showing the key switch structure of the second embodiment of the present invention.

The key switch structure of the second embodiment of the present invention, the overall configuration is the same as the first embodiment, except that only the fastening configuration of the upper key top 110 and the lower key top 130 is different, only for different parts Explain.

In the second embodiment, the upper key top 110 also includes the display portion 111 and the side wall portion 112 formed to protrude to the lower portion of the display portion 111 in the same manner as the upper key top 10 of the first embodiment. The sidewall portion 112 is formed with a downward opening groove 113 vertically opened downward.

A recessed portion 114 having a c-shaped cross section is formed in the lower inner circumference of the side wall portion 112, and an inclined portion 115 formed to be inclined upward is formed at the lowest end of the side wall portion 112.

On the other hand, in the second embodiment, the lower key top 130 is composed of a flat bottom surface portion 131 and a rod-shaped pressing portion 132 protruding downward from the bottom surface portion 131.

In the second embodiment configured as described above, when the upper key top 110 and the lower key top 130 are pressed to each other, the bottom portion 131 of the lower key top 130 presses the inclined portion 115 of the side wall 112. The lower portion of the key top 130 is elastically deformed and opened and inserted into the recess 114 to be fastened.

Operations and effects in the second embodiment are the same as those in the first embodiment.

Third Embodiment

The third embodiment of the present invention is for the case where the configuration of the present invention is applied to a scissor type key switch structure, which will be described below with reference to the drawings. Fig. 6 is a sectional view showing the key switch structure of the third embodiment of the present invention.

In the third embodiment, the key switch structure includes an upper key top 10, a lower key top 30 fastened to the upper key top 10, a seeder 80 rotatably connected to one side of the lower key top 30, The elastic restoring means 50 provided below the scissor 80, the switch part 60 arranged below the elastic restoring means 50, and this switch part 60 are mounted, The other side is composed of a base plate 140 rotatably connected.

The upper key top 10 and the lower key top 30 are configured in the same manner as in the first embodiment, and fastening of the seeder 80 to one end of the bottom portion 33 of the lower key top 30 and the other end opposite thereto. The only difference is that a pair of hinge portions 35a and 35b are further formed.

Meanwhile, in the third embodiment, the bottom surface of the display portion 11 of the upper key top 10 is formed as a convex lens portion 10a to increase the lighting effect.

The seeder 80 has a known configuration in which a plate-shaped first link 81 and a second link 82 are formed to be relatively rotatable with each other at the center, and the first link 81 and the second link 82 Through-holes 81a and 82a are formed in the central portion so that the dome-shaped elastic restoring means 50 can be inserted.

The upper end of the first link 81 is rotatably fixed to the hinge portion 35a formed at one side of the bottom portion 32 of the lower key top 30, and the upper end of the second link 82 is lower key top 30. It is rotatably fixed to the hinge portion 35b formed on the other side of the bottom portion 32 of the bottom surface).

In addition, the lower end of the first link 81 is rotatably fixed to the hinge portion 141b formed on one side of the base plate 140, and the lower end of the second link 82 is opposed to the base plate 140. It is rotatably fixed to the hinge portion 141a formed on the other side.

On the other hand, between the PCB 20 and the base plate 140 is provided with a PCB support portion 142 consisting of a plate or columnar shape, the PCB support portion 142 is formed integrally with the base plate 140 or separately It may be formed and fixed to the base plate 140.

The third embodiment is different from the first embodiment only in the configuration to which the well-known seeder 80 is applied, and the fastening of the upper key top 10 and the lower key top 30 is configured in the same manner, in the case of the first embodiment. Similarly, the LED 21, which is a light emitting device for illuminating the upper key top 10, is disposed directly below the display unit 11 of the upper key top 10, so that the distance between the upper key top 10 and the LED 21, which is the light emitting element, is disposed. The operation of d2 being close and the LED 21 illuminating the upper key top 10 directly without any obstacles improves the brightness and minimizes the loss of light energy.

Fourth Embodiment

The fourth embodiment of the present invention is for the case where the configuration of the present invention is applied to a mechanical key switch structure, which will be described below with reference to the drawings. Fig. 7 is a sectional view showing the key switch structure of the fourth embodiment of the present invention.

In the fourth embodiment, the key switch structure includes an upper key top 10, a lower key top 30 fastened to the upper key top 10, and a lower key top 30 to support the lower key top 30. The key top support part 240 is provided.

The upper key top 10 and the lower key top 30 are configured in the same manner as in the first embodiment, and extends downward to the bottom portion 33 of the lower key top 30 and has an upper end of the key top support 240 inside. The only difference is that the receiving portion 77 in which the receiving groove 36 for receiving is formed.

On the other hand, a concave lens portion 10b is formed on the bottom surface of the display portion 11 of the upper key top 10 to increase the lighting effect.

Inside the key top support 240 is a spring 241 is disposed connected to the pressing portion 34 to act as an elastic restoring means of the pressing portion 34, the lower end of the spring 241 is a key top support ( The movable part 242 is rotatably fixed to 240.

The base plate 243 is formed with two contacts 244 and 245 made of a conductive metal material.

In the fourth embodiment configured as described above, when the upper key top 10 is pressed, the lower key top 30 is lowered while being supported by the key top support 240, and when the spring 241 is pressed, the movable part 242 is spring. 241 rotates about the hinge point.

The contact 244 is pressed by the rotation of the movable portion 242 and connected to the contact 245.

In the fourth embodiment, only the configuration related to the mechanical key switch is different as described above, and the fastening of the upper key top 10 and the lower key top 30 is configured in the same manner, which is the same as in the first embodiment.

Accordingly, in the fourth embodiment, the LED 21, which is a light emitting device for illuminating the upper key top 10, is disposed directly under the display portion 11 of the upper key top 10, so that the upper key top 10 and the light emitting device are LEDs. The distance d2 is close to 21, and the LED 21 directly illuminates the upper key top 10 without any obstacle, thereby improving brightness and minimizing the loss of light energy, as in the first embodiment.

This embodiment is merely illustrative of the technical idea of the present invention, and should not be construed as limiting the technical scope of the present invention.

For example, the fixing method of the upper key top and the lower key top is not limited to the method of the first and second embodiments, but the method of fixing both members such as bonding, interference fitting, forming one concave portion and forming another convex portion. If it is, it is possible to apply other methods.

In addition, in the third and fourth embodiments, the method applied to the first embodiment is applied to the fixing method of the upper key top and the lower key top, but it is also possible to apply another fixing method as described above.

Meanwhile, in the third and fourth embodiments of the present invention, the convex lens portion or the concave lens portion is formed on the bottom of the display portion of the upper key top, but the present invention is not limited thereto. It is also possible.

1 is an exploded perspective view showing the key switch structure of the first embodiment of the present invention.

Fig. 2 is a sectional view showing the key switch structure of the first embodiment of the present invention.

Fig. 3 is a diagram showing a state in which the key switch structure of the first embodiment of the present invention operates.

Fig. 4 is an exploded perspective view showing the key switch structure of the second embodiment of the present invention.

Fig. 5 is a sectional view showing the key switch structure of the second embodiment of the present invention.

Fig. 6 is a sectional view showing the key switch structure of the third embodiment of the present invention.

Fig. 7 is a sectional view showing the key switch structure of the fourth embodiment of the present invention.

8 is a sectional view showing a key switch structure of the prior art.

Claims (17)

A key switch structure used for a light emitting keyboard in which a key top is illuminated by a light emitting element provided below the key top, An upper key top consisting of a display portion for displaying characters and a side wall portion extending downward from the periphery of the display portion, A PCB installed at a lower portion of the upper key top and provided with a light emitting device thereon; A lower key top installed at a lower portion of the PCB and fixed to a side wall of the upper key top; It is operated by the pressing of the upper key top includes a switch unit for transmitting the operation signal of the key top, The side wall portion of the upper key top is fixed to the lower key top through the guide groove formed to penetrate the PCB around the light emitting element in the PCB, so that the display portion of the upper key top is disposed immediately above the light emitting element rescue. A key switch structure used for a light emitting keyboard in which a key top is illuminated by a light emitting element provided below the key top, An upper key top consisting of a display portion for displaying characters and a side wall portion extending downward from the periphery of the display portion, A PCB installed at a lower portion of the upper key top and provided with a light emitting device thereon; A lower key top formed at a lower portion of the PCB and formed of a side wall portion extending upwardly and a bottom portion formed flat on the side wall portion; It is operated by the pressing of the upper key top includes a switch unit for transmitting the operation signal of the key top, The other side wall part is accommodated in the accommodating groove formed in either of the side wall part of the upper key top and the side wall part of the lower key top, and the upper key top and the lower key top are fixed to each other, The side wall portion of the upper key top is fixed to the lower key top through the guide groove formed to penetrate the PCB around the light emitting element in the PCB, so that the display portion of the upper key top is disposed immediately above the light emitting element rescue. A key switch structure used for a light emitting keyboard in which a key top is illuminated by a light emitting element provided below the key top, An upper key top formed of a display portion for displaying a letter and a side wall portion extending downward from a circumference of the display portion, and a lower portion of the side wall portion having a groove having a cross section along a horizontal inner circumference; A PCB installed at a lower portion of the upper key top and provided with a light emitting device thereon; A lower key top installed at a lower portion of the PCB, the lower key top including a bottom portion of a flat plate inserted into the recess; A switch unit connected by pressing the upper key top and electrically connected to the light emitting device, The side wall portion of the upper key top is fixed to the lower key top through the guide groove formed to penetrate the PCB around the light emitting element in the PCB, so that the display portion of the upper key top is disposed immediately above the light emitting element rescue. The method according to any one of claims 1 to 3, A lower opening groove is formed in the side wall portion of the upper key top to be opened downward; In the guide groove portion of the PCB corresponding to the portion where the lower opening groove is formed is formed a bridge that is a portion that is not formed with a guide groove, Key switch structure, characterized in that the circuit inside and outside the guide groove in the PCB can be connected to each other through the bridge. The method of claim 2, An upper opening groove is formed in the side wall portion of the lower key top, In the guide groove portion of the PCB corresponding to the portion where the upper open groove is formed is formed a bridge that is a portion that is not formed with a guide groove, Key switch structure, characterized in that the circuit inside and outside the guide groove in the PCB can be connected to each other through the bridge. The method of claim 3, wherein And an inclined portion formed to be inclined upwardly at a lowermost end of the side wall portion of the upper key top. The method according to any one of claims 1 to 3, The lower key top has a rod-shaped pressing portion protruding downwardly, And said switch portion comprises a first contact pressed by said pressing portion and a second contact connected to said first contact. The method of claim 7, wherein The key switch structure, characterized in that between the lower key top and the switch unit is provided with an elastic restoring means for restoring the key top moved downward when pressed. The method of claim 8, The elastic restoring means has a dome shape of an elastic material, and a protrusion is formed at a vertex portion of the dome shape. The protrusion is disposed so as to be positioned vertically above the first vertex, and the pressing portion of the lower key top is disposed on the upper surface of the protrusion so that the protrusion presses the first contact to connect with the second contact when pressing the key top. Key switch structure. The method of claim 9, A base plate is installed above the switch unit, And a receptacle for accommodating the dome shape is formed at a portion where the dome-shaped elastic means is disposed in the base plate. The method of claim 10, The key top guide is formed on the upper portion of the receiving portion, The key top guide portion, the key switch structure, characterized in that extending in the longitudinal direction to accommodate the pressing portion and the hollow portion having a shape corresponding to the cross-sectional shape of the pressing portion formed therein. The method of claim 10, Key switch structure, characterized in that formed between the base plate and the PCB to protrude upward to support the PCB supporting the PCB. The method of claim 9, The base plate is disposed on the upper surface of the switch unit, A seeder is installed between the lower key top and the base plate. The scissor is composed of a first link and a second link that are pivotally intersected at a center thereof, and a through hole is formed at the center of each of the first link and the second link to accommodate the dome-shaped elastic restoring means. Become, The upper end of the first link of the scissor is rotatably fixed to one side of the bottom portion of the lower keytop, the upper end of the second link is rotatably fixed to the other side of the bottom portion of the lower keytop, And a lower end of the first link is rotatably fixed to one side of the base plate, and a lower end of the second link is rotatably fixed to the opposite side of the base plate. The method of claim 13, Key switch structure, characterized in that formed between the base plate and the PCB to protrude upward to support the PCB supporting the PCB. The method according to any one of claims 1 to 3, The lower key top has a rod-shaped pressing portion protruding downwardly, A spring is disposed below the pressing portion, A movable part is installed below the spring, And said switch portion comprises a first contact pressed by a movable portion moved by said pressing portion and a second contact connected to said first contact. The method of claim 15, Key switch structure, characterized in that formed between the base plate formed on the upper portion of the switch and the PCB to protrude upwards to support the PCB. The method according to any one of claims 1 to 3, And a convex lens portion or a concave lens portion formed on a bottom surface of the display portion of the upper key top.

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