Key structure and lamp screen equipment

Abstract

The utility model provides a button structure and a lamp screen device, the button structure comprises a light-transmitting cover body, a shading shell and a light-emitting member, the light-transmitting cover body is provided with a light-emitting surface, the shading shell is connected with the light-transmitting cover body, the shading shell and the light-transmitting cover body jointly enclose to form an accommodating cavity, the accommodating cavity is located at one side of the light-transmitting cover body deviating from the light-emitting surface, and the light-emitting member is connected with the light-transmitting cover body. The light-emitting part is installed in the containing cavity and used for generating emergent light, and the emergent light of the light-emitting part is emitted from the light-emitting face. Therefore, compared with a key structure in the related technology, the key structure can reasonably install the light-emitting part in the accommodating cavity of the key structure, so that emergent light generated by the light-emitting part can uniformly penetrate through the light-emitting surface of the light-transmitting cover body. Besides, the light-emitting part is installed in the accommodating cavity, so that the emergent light of the light-emitting part does not need to penetrate through the whole key structure and then is emitted from the light-emitting surface, and the brightness of the emergent light of the light-emitting part emitted from the light-emitting surface can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic products, and in particular to a key structure and a light screen device. Background Art

[0002] The switch of the light screen device can be connected to the key structure, and the user can trigger the switch through the key structure to control the light screen device. The light screen device is generally provided with a light-emitting component. The light emitted by the light-emitting component needs to pass through the entire key structure and then be emitted from the light-emitting surface of the key structure, so that the user can quickly identify the position of the key structure. However, the light-emitting component and the key structure of the light screen device in the related art are independent and spaced apart. The layout of the light-emitting component inside the light screen device is relatively limited, resulting in the light emitted by the light-emitting component not being evenly emitted from the light-emitting surface of the key structure. Utility Model Content

[0003] The embodiment of the present invention proposes a button structure and a light screen device to improve at least one of the above problems.

[0004] The embodiments of the present invention achieve the above-mentioned objectives through the following technical solutions.

[0005] In the first aspect, an embodiment of the utility model provides a key structure, which includes a translucent cover, a light-shielding shell and a light-emitting component. The translucent cover has a light-emitting surface. The light-shielding shell is connected to the translucent cover. The light-shielding shell and the translucent cover together enclose a accommodating cavity. The accommodating cavity is located on the side of the translucent cover away from the light-emitting surface. The light-emitting component is installed in the accommodating cavity. The light-emitting component is used to generate output light, and the output light of the light-emitting component is emitted from the light-emitting surface.

[0006] In some embodiments, the light emitting element is opposite to the light-transmitting cover and is spaced apart from each other.

[0007] In some embodiments, the light-shielding shell includes a light-shielding frame and a light-shielding base. The light-shielding base, the light-shielding frame and the light-transmitting cover together enclose a accommodating cavity. The light-shielding base and the light-transmitting cover are opposite to each other and spaced apart. The light-shielding base and the light-transmitting cover are respectively connected to the opposite ends of the light-shielding frame, and the light-emitting component is installed on the side of the light-shielding base facing the light-emitting surface.

[0008] In some embodiments, a through hole is provided on the light-shielding base, and the light-emitting component is provided with a wire, which passes through the through hole; the key structure also includes a sealing component, which is arranged in the through hole, and the wire passes through the sealing component.

[0009] In some embodiments, the light-emitting element includes a circuit board and lamp beads, the lamp beads are installed on the circuit board, the circuit board is provided with a fixing hole, the light-shielding base is provided with a fixing column, and the fixing column is passed through the fixing hole.

[0010] In some embodiments, a first mounting groove is provided at one end of the light-shielding frame body facing away from the light-transmitting cover body, and the light-shielding base is embedded in the first mounting groove; the button structure also includes a first adhesive component, the first adhesive component is located in the first mounting groove, and the first adhesive component abuts between the bottom of the first mounting groove and the light-shielding base.

[0011] In some embodiments, a second mounting groove is provided at the end of the light-shielding shell, the second mounting groove is connected to the accommodating cavity, a portion of the light-transmitting cover body is embedded in the second mounting groove, and another portion of the light-transmitting cover body is located outside the second mounting groove; the button structure is also provided with a second adhesive component, the second adhesive component is located in the second mounting groove, and the second adhesive component abuts between the bottom of the second mounting groove and the light-transmitting cover body.

[0012] In some embodiments, the light-transmitting cover is provided with a groove, which is located on a side of the light-transmitting cover facing the accommodating cavity and is connected to the accommodating cavity.

[0013] In the second aspect, the embodiment of the present invention also provides a lamp screen device, which includes a lamp screen device body and a key structure of any of the above-mentioned embodiments. The lamp screen device body includes a shell, a control panel, a power supply, a switch and a screen. The control panel is installed in the shell, the power supply and the switch are arranged on the control panel, and the screen is electrically connected to the control panel and exposed outside the shell; the key structure is installed in the shell, the bottom of the key structure abuts against the switch, the light-emitting surface is exposed outside the shell, the light-emitting component of the key structure is electrically connected to the power supply through a wire, and the switch is used to control the electrical connection between the light-emitting component and the power supply.

[0014] In some embodiments, the light screen device further includes an elastic structure connected between the switch and the button structure.

[0015] In the key structure and light screen device provided by the embodiment of the present invention, the key structure includes a translucent cover body, a light-shielding shell and a light-emitting component. The translucent cover body has a light-emitting surface. The light-shielding shell is connected to the translucent cover body. The light-shielding shell and the translucent cover body jointly enclose a housing cavity. The housing cavity is located on the side of the translucent cover body away from the light-emitting surface. The light-emitting component is installed in the housing cavity. The light-emitting component is used to generate output light. The output light of the light-emitting component is emitted from the light-emitting surface. In this way, compared with the key structure in the related art, the key structure of the present application can reasonably install the light-emitting component in the output cavity of the key structure, so that the output light generated by the light-emitting component can pass through the light-emitting surface of the translucent cover body more evenly. In addition, since the light-emitting component is installed in the housing cavity, the output light of the light-emitting component does not need to pass through the entire key structure and then be emitted from the light-emitting surface, which helps to improve the brightness of the output light of the light-emitting component emitted from the light-emitting surface. Furthermore, the light-shielding housing can effectively prevent the light emitted by the light-emitting element from leaking into other areas where light is not required, so that the light emitted by the light-emitting element is evenly emitted from the light-emitting surface, thereby helping to reduce the risk of light emitted by the light-emitting element leaking into the interior of the light-screen device. Furthermore, there is no need to add an additional light-shielding structure inside the light-screen device to prevent light leakage from the key structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A schematic structural diagram of a light screen device provided in an embodiment of the present utility model is shown.

[0018] Figure 2 Shown Figure 1 Schematic cross-sectional view of the mid-light screen device.

[0019] Figure 3 A cross-sectional schematic diagram of a light screen device provided in another embodiment of the present invention is shown.

[0020] Figure 4 A structural schematic diagram of a key structure provided by an embodiment of the present utility model is shown.

[0021] Figure 5 Shown Figure 4 Schematic cross-sectional view of the middle button structure.

[0022] Figure 6 Shown Figure 4 Schematic diagram of the decomposition structure of the key structure.

[0023] Figure 7 Shown Figure 5 Schematic diagram of part of the structure of the middle key structure.

[0024] Description of Figure Numbers:

[0025] Lamp screen device 10, lamp screen device body 20, shell 20a, switch 20b, control panel 20c, screen 20d, button structure 30, elastic structure 40, light-transmitting cover 100, light-emitting surface 101, slot 102, light-shielding shell 200, accommodating cavity 201, light-shielding frame 210, light-shielding base 220, fixing column 221, light-emitting component 300, wire 310, circuit board 320, fixing hole 321, lamp bead 330, seal 400, first adhesive component 500, second adhesive component 600. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the utility model.

[0027] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the utility model.

[0028] See also Figure 1 and Figure 2 The present invention provides a light screen device 10. Light screen device 10 refers to a device with an electronic screen. Light screen device 10 can be a pixel screen, such as an LED display, an OLED screen, or an LCD screen. Light screen device 10 can also be a tablet computer or a touchscreen phone.

[0029] The light screen device 10 may include a light screen device body 20 and a key structure 30. The light screen device body 20 includes a housing 20a, a control panel 20c, a power supply, a switch 20b, and a screen 20d. The control panel 20c is installed in the housing 20a, the power supply and switch 20b are arranged on the control panel 20c, and the screen 20d is electrically connected to the control panel 20c and exposed outside the housing 20a. The key structure 30 is installed in the housing 20a, and the bottom of the key structure 30 abuts against the switch 20b. The key structure 30 is provided with a light emitting surface 101, which is exposed outside the housing 20a. The key structure 30 is provided with a light emitting component 300. The light emitting component 300 of the key structure 30 is electrically connected to the power supply via a wire 310. The switch 20b is used to control the electrical connection between the light emitting component 300 and the power supply.

[0030] The user can control the switch 20b through the key structure 30 to control the operation of the light screen device 10. For example, the switch 20b can be a pressure switch 20b, and the user can press the light-emitting surface 101 of the key structure 30 so that the key structure 30 presses the switch 20b to trigger the switch 20b, thereby turning on the light-emitting component 300. For another example, the switch 20b can be a push-button switch 20b, and the user can press the light-emitting surface 101 of the key structure 30 so that the key structure 30 presses the switch 20b to trigger the switch 20b, thereby turning on the light-emitting component 300. Of course, the switch 20b can also control the power on and off function of the light screen device 10. When the switch 20b is triggered, the screen 20d can be powered on through the control panel 20c, so that the screen 20d can work (for example, display pictures or play videos).

[0031] In other embodiments, the number of the button structure 30 and the switch 20b can be multiple, each button structure 30 can correspond to a switch 20b, and different switches 20b can control different functions of the light screen device 10. In this way, different button structures 30 can control corresponding switches 20b to control the operation of the light screen device 10.

[0032] The specific structure of the button structure 30 can refer to the following embodiments. Since the light screen device 10 adopts all the technical solutions of all the following embodiments, it has at least all the beneficial effects brought by the technical solutions of the following embodiments, which will not be described one by one here.

[0033] See also Figures 4 to 6 The embodiment of the present invention further proposes a key structure 30, which includes a translucent cover 100, a light-shielding shell 200, and a light-emitting component 300. The translucent cover 100 has a light-emitting surface 101. The light-shielding shell 200 is connected to the translucent cover 100. The light-shielding shell 200 and the translucent cover 100 together enclose a receiving cavity 201. The receiving cavity 201 is located on the side of the translucent cover 100 away from the light-emitting surface 101. The light-emitting component 300 is installed in the receiving cavity 201. The light-emitting component 300 is used to generate output light, and the output light of the light-emitting component 300 is emitted from the light-emitting surface 101. In this way, compared with the key structure in the related art, the key structure 30 of the present application can reasonably install the light-emitting component 300 in the receiving cavity 201 of the key structure 30, so that the output light generated by the light-emitting component 300 can pass through the light-emitting surface 101 of the translucent cover 100 more evenly.

[0034] In addition, since the light-emitting component 300 is installed in the accommodating cavity 201, the light emitted by the light-emitting component 300 does not need to pass through the entire key structure 30 and then be emitted from the light-emitting surface 101, which helps to improve the brightness of the light emitted by the light-emitting component 300 from the light-emitting surface 101.

[0035] Furthermore, the light shielding housing 200 can effectively prevent the light emitted by the light emitting element 300 from leaking to other areas where light is not required, so that the light emitted by the light emitting element 300 is evenly emitted from the light emitting surface 101, thereby helping to reduce the risk of the light emitted by the light emitting element 300 leaking into the interior of the light screen device 10. Furthermore, there is no need to add an additional light shielding structure inside the light screen device 10 to prevent light leakage from the key structure 30.

[0036] See also Figure 1 and Figure 4 In some embodiments, the light emitting surface 101 can be exposed outside the housing 20a, thereby helping to indicate the specific location of the button structure 30 set in the housing 20a, making it easier for the user to contact the light emitting surface 101 of the button structure 30, thereby making it easier for the user to quickly trigger the switch 20b.

[0037] See also Figure 3 and Figure 4 In some embodiments, the light screen device 10 further includes an elastic structure 40, which can be a spring, a rubber spring, or a silicone spring. The elastic structure 40 is connected between the switch 20b and the key structure 30. The elastic structure 40 can abut the switch 20b and the end of the key structure 30 facing away from the light-emitting surface 101. This allows the elastic structure 40 to provide pressure feedback, allowing the user to experience a noticeable tactile sensation when operating the key structure 30, thereby optimizing the operational feel.

[0038] In addition, the elastic structure 40 can absorb the pressure transmitted to the switch 20b during the pressing process of the key structure 30, reduce the impact on the switch 20b, and extend the service life of the switch 20b. Moreover, the buffering effect of the elastic structure 40 can reduce the wear of the switch 20b.

[0039] See also Figure 4 and Figure 5 In some embodiments, the light emitting element 300 is disposed opposite and spaced apart from the light-transmitting cover 100. This creates a certain distance between the light emitting element 300 and the light-transmitting cover 100, allowing the light emitted by the light emitting element 300 to be more evenly emitted to the light-emitting surface 101, thereby preventing the light emitted by the light emitting element 300 from forming bright spots on the light-emitting surface 101.

[0040] In some embodiments, the light-transmitting cover 100 can be made of a transparent material, for example, a polycarbonate light-transmitting cover, an acrylic resin light-transmitting cover, or a glass light-transmitting cover, etc. Alternatively, the light-transmitting cover 100 can be made of a translucent material, for example, a polystyrene light-transmitting cover, a polyethylene light-transmitting cover, or a polyvinyl chloride light-transmitting cover, etc.

[0041] In some embodiments, the light-shielding housing 200 may include a light-shielding frame 210 and a light-shielding base 220. The light-shielding base 220, the light-shielding frame 210, and the light-transmitting cover 100 together enclose a receiving cavity 201. In this way, the light-shielding base 220 and the light-shielding frame 210 can block the light emitted by the light-emitting element 300, so that the light emitted by the light-emitting element 300 is emitted from the light-emitting surface 101 of the light-transmitting cover 100.

[0042] In some embodiments, the light shielding base 220 can be made of a light shielding material, for example, a black plastic light shielding base; or an aluminum alloy light shielding base.

[0043] In some embodiments, the light shielding frame 210 can be made of a light shielding material, for example, a black plastic light shielding base; or an aluminum alloy light shielding base.

[0044] In some embodiments, the light-shielding base 220 and the light-transmitting cover 100 are disposed opposite and spaced apart from each other. The light-shielding base 220 and the light-transmitting cover 100 are respectively connected to opposite ends of the light-shielding frame 210, and the light-emitting element 300 is mounted on the side of the light-shielding base 220 facing the light-emitting surface 101. In this way, the spacing between the light-shielding base 220 and the light-transmitting cover 100 can be designed to be within an appropriate range, so that an operator only needs to install the light-emitting element 300 on the light-shielding base 220 to ensure that the light-emitting element 300 and the light-transmitting cover 100 are at an appropriate distance.

[0045] See also Figure 5 and Figure 7 In some embodiments, a through hole is provided on the light-shielding base 220, and a wire 310 is provided on the light-emitting component 300, and the wire 310 passes through the through hole. The key structure 30 also includes a seal 400, which is disposed in the through hole, and the wire 310 passes through the seal 400. The seal 400 can be a silicone seal or a rubber seal. In this way, the seal 400 can reduce the risk of the emitted light of the light-emitting component 300 leaking from the connection between the wire 310 and the light-shielding base 220. In addition, the seal 400 can ensure that the wire 310 of the light-emitting component 300 forms a reliable seal when passing through the seal 400, thereby reducing the risk of dust entering the interior of the key structure 30.

[0046] See also Figure 6 and Figure 7In some embodiments, the light-emitting element 300 includes a circuit board 320 and a lamp bead 330. The lamp bead 330 is mounted on the circuit board 320. The circuit board 320 has a fixing hole 321. The light-shielding base 220 may have a fixing post 221, which passes through the fixing hole 321. The fixing post 221 may have an interference fit with the fixing hole 321, so that the circuit board 320 can be fixedly mounted on the light-shielding base 220.

[0047] In some embodiments, the light screen device 10 may further include a control mainboard, and the lamp beads 330 may be electrically connected to the circuit board 320. The circuit board 320 may be electrically connected to the control mainboard via a wire 310 so as to control the operation of the lamp beads 330 when the control mainboard is powered on. For example, when the light screen device 10 is powered on, the lamp beads 330 of the light-emitting element 300 can emit light, so that the light emitted by the light-emitting element 300 is emitted from the light-emitting surface 101.

[0048] In some embodiments, the fixing column 221 can be a hot melt column. During the installation process, the operator can heat the end of the hot melt column away from the light-shielding base 220, so that the fixing column 221 is heated and melted, thereby making the fixing column 221 more firmly connected to the circuit board 320.

[0049] See also Figure 5 and Figure 6 In some embodiments, a first mounting groove is provided at one end of the light-shielding frame 210 facing away from the light-transmitting cover 100 , and the light-shielding base 220 is embedded in the first mounting groove, thereby facilitating the installation of the light-shielding base 220 on the light-shielding frame 210 .

[0050] The key structure 30 also includes a first adhesive member 500, which can be double-sided tape or hot-melt adhesive. The first adhesive member 500 can be arranged around the edge of the light-shielding base 220. The first adhesive member 500 is located in the first mounting groove, abutting between the bottom of the first mounting groove and the light-shielding base 220. In this way, the first adhesive member 500 can improve the secure connection between the light-shielding base 220 and the light-shielding frame 210, thereby helping to reduce the risk of loosening between the light-shielding frame 210 and the light-shielding base 220.

[0051] In some embodiments, a second mounting groove is provided at the end of the light-shielding housing 200, the second mounting groove being connected to the accommodating cavity 201. A portion of the light-transmitting cover 100 is embedded in the second mounting groove, while another portion of the light-transmitting cover 100 is located outside the second mounting groove, thereby facilitating quick and convenient installation of the light-transmitting cover 100 on the light-shielding housing 200. In addition, the location of a portion of the light-transmitting cover 100 within the light-shielding housing 200 makes the key structure 30 more compact.

[0052] In some embodiments, the key structure 30 is further provided with a second adhesive member 600. The second adhesive member 600 may be double-sided tape or hot melt adhesive. The second adhesive member 600 may be disposed around the edge of the light-transmitting cover 100. The second adhesive member 600 is located in the second mounting groove, abutting between the bottom of the second mounting groove and the light-transmitting cover 100. In this manner, the first adhesive member 500 can enhance the secure connection between the light-transmitting cover 100 and the light-shielding housing 200, thereby helping to reduce the risk of loosening between the light-transmitting cover 100 and the light-shielding housing 200.

[0053] See also Figure 5 In some embodiments, the light-transmitting cover 100 is provided with a slot 102. The slot 102 is located on the side of the light-transmitting cover 100 facing the accommodating cavity 201 and is connected to the accommodating cavity 201. The slot 102 provides additional space for the light-transmitting cover 100 during the molding and cooling process, allowing the light-transmitting cover 100 to shrink freely without generating internal stress, thereby helping to reduce the risk of shrinkage of the light-transmitting cover 100. Furthermore, the provision of the slot 102 on the light-transmitting cover 100 effectively alleviates the shrinkage stress of the material during the cooling process, thereby improving the structural stability of the light-transmitting cover 100.

[0054] In utility models, unless otherwise expressly specified or limited, terms such as "mounted" and "connected" should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integral connections; mechanical connections; direct connections, indirect connections through an intermediary, internal communication between two components, surface contact only, or surface contact through an intermediary. Those skilled in the art will understand the specific meanings of these terms in utility models based on the specific circumstances.

[0055] In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as a specific reference or special structure. The description of the term "some embodiments" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the utility model, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the utility model and the features of different embodiments or examples, unless they are contradictory.

[0056] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model, and should all be included in the scope of protection of the utility model.

Claims

1. A key structure, characterized in that: include: A light-transmitting cover having a light-emitting surface; a light-shielding housing connected to the light-transmitting cover, the light-shielding housing and the light-transmitting cover jointly enclosing a receiving cavity, the receiving cavity being located on a side of the light-transmitting cover away from the light-emitting surface; as well as A light-emitting component is installed in the accommodating cavity, and the light-emitting component is used to generate output light, and the output light of the light-emitting component is emitted from the light-emitting surface.

2. The key structure according to claim 1, characterized in that: The light emitting element is opposite to the light-transmitting cover and is spaced apart from each other.

3. The key structure according to claim 1, characterized in that: The light-shielding shell includes a light-shielding frame and a light-shielding base. The light-shielding base, the light-shielding frame and the light-transmitting cover together enclose the accommodating cavity. The light-shielding base and the light-transmitting cover are opposite to and spaced apart from each other. The light-shielding base and the light-transmitting cover are respectively connected to the opposite ends of the light-shielding frame. The light-emitting component is installed on the side of the light-shielding base facing the light-emitting surface.

4. The key structure according to claim 3, characterized in that: The light-shielding base is provided with a through hole, the light-emitting element is provided with a wire, and the wire passes through the through hole; The key structure further includes a sealing member, which is disposed in the through hole, and the wire passes through the sealing member.

5. The key structure according to claim 3, characterized in that: The light-emitting component includes a circuit board and lamp beads, the lamp beads are installed on the circuit board, the circuit board is provided with a fixing hole, the light-shielding base is provided with a fixing column, and the fixing column is passed through the fixing hole.

6. The key structure according to claim 3, characterized in that: A first mounting groove is provided at one end of the light-shielding frame body away from the light-transmitting cover body, and the light-shielding base is embedded in the first mounting groove; The button structure further includes a first adhesive component, which is located in the first mounting groove and abuts between the bottom of the first mounting groove and the light-shielding base.

7. The key structure according to claim 1, characterized in that: A second mounting groove is provided at the end of the light-shielding housing, the second mounting groove is communicated with the accommodating cavity, a portion of the light-transmitting cover is embedded in the second mounting groove, and another portion of the light-transmitting cover is located outside the second mounting groove; The button structure is further provided with a second adhesive component, which is located in the second mounting groove and abuts between the bottom of the second mounting groove and the light-transmitting cover.

8. The key structure according to claim 1, characterized in that: The light-transmitting cover is provided with a slot, and the slot is located on a side of the light-transmitting cover facing the accommodating cavity and is communicated with the accommodating cavity.

9. A light screen device, characterized in that: include: A light screen device body, the light screen device body comprising a housing, a control panel, a power supply, a switch, and a screen, the control panel being installed in the housing, the power supply and the switch being provided on the control panel, and the screen being electrically connected to the control panel and exposed outside the housing; as well as According to the key structure according to any one of claims 1 to 8, the key structure is installed in the shell, the bottom of the key structure abuts against the switch, the light-emitting surface is exposed outside the shell, the light-emitting component of the key structure is electrically connected to the power supply through the wire, and the switch is used to control the electrical connection between the light-emitting component and the power supply.

10. The light screen device according to claim 9, characterized in that: The light screen device also includes an elastic structure, which is connected between the switch and the button structure.

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