TWM544646U - Thin luminescent keyboard and backlight module with membrane switch - Google Patents

Description

Thin illuminated keyboard and backlight module with membrane switch

This creative department is related to the field of illuminated keyboards, especially a thin film type illuminated keyboard and a backlight module with a membrane switch.

With the advancement of technology, various electronic devices have become indispensable products in life, such as computers, which are quite popular data-based electronic devices. The main input devices for desktop computers or notebook computers, such as keyboards and mice, also have better functionality and ease of use as technology advances. Taking the keyboard as an example, in view of the fact that people use computers for a longer period of time and the area is not restricted, if the keyboard button can still be recognized in a dark environment, the relevant industry has a backlight module combined with the keyboard to make the keyboard With a light source to achieve the lighting effect, a keyboard with luminous efficacy came into being.

The conventional illuminated keyboard is provided with a backlight module between the bottom plate and the button to provide uniform light for each button, so that it can be illuminated for the user to recognize. Nowadays, electronic devices are gradually becoming thinner and lighter, and the demand for matching input devices has also changed. In order to reduce the overall thickness of the illuminated keyboard, the backlight module therein must effectively reduce its vertical height, especially for one type of keyboard of a notebook computer. Therefore, if the height of the keyboard cannot be effectively reduced, a certain space should be reserved for the keyboard setting of the notebook computer to facilitate installation, resulting in an increase in the overall thickness of the notebook computer. On the other hand, the general backlight module has a light guiding element and a light source, which can effectively reduce the vertical height of the light guiding element in technology, but the height of the light source part is limited by technical limitations. Still far beyond the light guiding element, the actual application will cause excessive light to escape to the outside, so that the amount of light guided by the light guiding element and provided to the button is insufficient, thereby reducing the overall luminous efficiency.

Therefore, in order to solve the problem that the conventional illuminating keyboard is caused by the backlight module and the overall thickness is too high, and the light utilization rate is insufficient, the creator proposes an illuminating keyboard and a backlight module with a membrane switch, which is effective. Solve the above missing.

One of the aims of the present invention is to provide a thin-type illuminated keyboard and a backlight module with a membrane switch, which can effectively reduce the overall thickness of the keyboard, meet the requirements of thinning and high light utilization rate, and improve the overall luminous efficiency.

In order to achieve the above object, the present invention discloses a thin-type illuminated keyboard, comprising: a plurality of button groups; a frame cover having a plurality of openings for setting the button groups; and a membrane switch module disposed on the frame cover a row of wires is arranged on one side; a base is disposed on one side of the membrane switch module; a thin light guide plate is disposed on one side of the base, and a thickness of one side of the thin light guide plate is larger than the other side a bell mouth structure, and one side of the thin light guide plate having a maximum thickness is a light incident surface; and a light source disposed corresponding to the light incident surface to form a lateral light incident. Thereby, the thickness of the light-incident side is increased by the bell mouth structure of the thin light guide plate, so that the light of the light source enters the thin light guide plate as much as possible and guides to form the light to illuminate the button group, thereby avoiding the reduction of the thickness but the large Part of the light cannot be effectively utilized by the thin light guide plate.

In one embodiment, when the maximum thickness of the thin light guide plate is between 0.4 and 0.6 mm, the bell mouth structure defines a wire hole for providing the wire. Since the thin light guide plate has a high vertical height on the side of the bell mouth structure, after being assembled with the base and the membrane switch module, the cable may be blocked and cannot be pulled to the outside, so the through-hole is can Let the cable go out from there to the outside.

In addition, in another embodiment, the bell mouth structure has a sloped surface that is connected to a light-emitting surface of the thin light guide plate, and the wire hole is located at the center of the slope surface, thereby facilitating assembly and production. .

Based on the foregoing embodiment, in the second embodiment, the inclined surface has a plurality of light guiding grooves to enhance the light guiding performance of the thin light guiding plate. Through the light guiding grooves, the angle of refraction after the light is incident can be adjusted to improve the uniformity of the light guiding.

Preferably, in one embodiment, the minimum thickness of the thin light guide plate is between 0.2 and 0.3 mm to effectively reduce the overall thickness of the illuminated keyboard.

In another embodiment, the membrane switch module includes a first circuit layer, an interposer, and a second circuit layer. The first circuit layer has a plurality of first electrical contacts corresponding to the button group, and the second circuit The layer pair should wait for the first electrical contact to have a plurality of second electrical contacts, the interposer corresponding to the first electrical contact and the second electrical contacts forming a plurality of perforations. Thereby, when the button group is pressed against the first electrical contact, the first electrical contact is forced to contact with the second electrical contact to form a conduction, thereby generating a corresponding control signal for the transmission of the cable.

In a further embodiment, the thin-type illuminated keyboard further has a reflective sheet disposed on the bottom side of the thin light guide plate to reflect the light scattered from the bottom surface of the thin light guide plate back into the thin light guide plate for guiding and improving the light use. rate.

In the second embodiment, each of the button sets includes a key cap and a support member. The support member is disposed on the bottom side of the key cap to support the key cap, and the key cap has at least one predetermined Light emitting area. The support member is provided to support the keycap and is mountable at the opening of the frame cover, and a predetermined figure or the like may be provided in the predetermined light-emitting area.

Based on the foregoing embodiment, in one embodiment, the support member is disclosed to be transparent to prevent light from affecting the light-emitting performance of the key cap due to the support member blocking.

The invention also discloses a backlight module with a membrane switch, which is applied to a thin type of illuminated keyboard, comprising: a membrane switch module extending with a row of wires; and a base disposed on one side of the membrane switch module a thin light guide plate disposed on one side of the base, the thickness of one side of the thin light guide plate being larger than the other side to form a bell mouth structure, and one side of the thin light guide plate having a maximum thickness is a light incident surface; And a light source disposed corresponding to the light incident surface to form a lateral light. Thereby, the thickness of the backlight module can be effectively reduced, and the thickness of the illuminated keyboard can be reduced, and the light structure of the light guide plate can be used to enter the thin light guide plate and guide the formation through the bell mouth structure of the thin light guide plate. sold out.

In one embodiment, when the maximum thickness of the thin light guide plate is between 0.4 and 0.6 mm, the bell mouth structure defines a wire hole for providing the wire. Therefore, the thin light guide plate and the base and the membrane switch module can be prevented from being assembled with each other, and the cable is blocked by the bell mouth and cannot be pulled to the outside.

In addition, in another embodiment, the bell mouth structure has a sloped surface that is connected to a light-emitting surface of the thin light guide plate, and the wire hole is located at the center of the slope surface to facilitate assembly and production.

Based on the foregoing embodiment, in the second embodiment, the inclined surface has a plurality of light guiding grooves to enhance the light guiding performance of the thin light guiding plate. Through the light guiding grooves, the angle of refraction after the light is incident can be adjusted to improve the uniformity of the light guiding.

Preferably, in one embodiment, the minimum thickness of the thin light guide plate is between 0.2 and 0.3 mm to effectively reduce the overall thickness of the backlight module.

In another embodiment, the membrane switch module includes a first circuit layer, an interposer, and a second circuit layer. The first circuit layer has a plurality of first electrical contacts, and the second circuit layer corresponds to a second An electrical contact has a plurality of second electrical contacts, and the interposer forms a plurality of perforations corresponding to the first electrical contacts and the second electrical contacts. Therefore, when the backlight module is applied to the illuminated keyboard, the first electrical contact can be electrically connected to the second electrical contact to form a conduction, thereby generating a corresponding control signal for the transmission of the cable.

In a further embodiment, a backlight module with a membrane switch is further provided with a reflective sheet disposed on the bottom side of the thin light guide plate to reflect light scattered from the bottom surface of the thin light guide plate back into the thin light guide plate for guiding. To improve light usage.

In one embodiment, the present disclosure discloses a thin illuminated keyboard, comprising: a plurality of button sets; a frame cover having a plurality of openings for providing the button groups; and a membrane switch module disposed on one side of the frame cover and a lining is disposed on one side of the membrane switch module; a thin light guide plate is disposed on one side of the pedestal, the thin light guide plate has a trapezoidal structure in the center, and the lower surface of the trapezoidal structure has a trench for accommodating a light strip, the trapezoidal structure and the trench form a first light incident surface and a second light incident surface; a plurality of first LEDs are located in the light strip, corresponding to a light-incident surface is disposed to form a first bell-shaped lateral light-in structure; and a plurality of second LEDs are disposed on the light source strip, corresponding to the second light-incident surface, to form a second bell-shaped side Into the light structure. Thereby, through the structural features of the trapezoidal structure and the groove, when the light source light bar is disposed in the groove, the thin light guide plate is laterally inserted into the light structure by the first and second bell mouths, so that the light source of the light source enters the thin type as much as possible. The light guide plate has the application of bidirectional guiding light, and at the same time meets the requirements of thinning.

Based on the foregoing, the first bell-shaped lateral light-in structure and the first The two bell-shaped lateral light-incident structures respectively have a plurality of light guiding grooves to adjust the refractive angle of the light after incident, thereby improving the light guiding performance of the thin light guiding plate.

In addition, in another embodiment, the thin light guide plate has a minimum thickness of 0.2 to 0.3 mm to effectively reduce the thickness of the illuminated keyboard.

As described above, the membrane switch module includes a first circuit layer, an interposer, and a second circuit layer. The first circuit layer has a plurality of first electrical contacts corresponding to the button group, and the second circuit layer pair The first electrical contact should have a plurality of second electrical contacts, and the interposer should form a plurality of perforations corresponding to the first electrical contact and the second electrical contacts to borrow the first electrical contact and the second electrical connection. Point contact achieves the effect of generating an operation signal.

In an embodiment, the thin-type illuminated keyboard further has a reflective sheet disposed on the bottom side of the thin light guide plate to reflect light back into the thin light guide plate.

Preferably, in an embodiment, each of the button sets includes a keycap and a support member, and the support member is disposed on a bottom side of the keycap to support the keycap, and the keycap has at least A predetermined illumination zone, and in yet another embodiment, the support is transparent to avoid blocking light transmission.

The invention also discloses a backlight module with a membrane switch, which is applied to a thin type of illuminated keyboard, comprising: a membrane switch module extending with a row of wires; and a base disposed on one side of the membrane switch module a thin light guide plate is disposed on a side of the base, the thin light guide plate has a trapezoidal structure at the center thereof, and a lower surface of the trapezoidal structure has a groove for accommodating a light source light strip, the trapezoidal structure and the groove Forming a first light incident surface and a second light incident surface; a plurality of first LEDs are disposed on the light source strip, corresponding to the first light incident surface, to form a first bell mouth a lateral light-incident structure; and a plurality of second LEDs disposed on the light source strip, corresponding to the second light-incident surface, to form a second bell-shaped lateral light-incident structure. Thereby, the thickness of the backlight module can be effectively reduced, and the thickness of the illuminated keyboard of the application can be reduced, and the first and second bell-shaped lateral light-incident structures can be used to allow the light of the light source to enter the thin light guide plate as much as possible. It has an application for bidirectional guided light output.

Based on the foregoing, in an embodiment, the first bell-shaped lateral light-incident structure and the second bell-shaped lateral light-incident structure respectively have a plurality of light guiding grooves to adjust a refractive angle of the incident light, and further Improve the light guiding performance of the thin light guide plate.

In addition, in another embodiment, the thin light guide plate has a minimum thickness of 0.2 to 0.3 mm to effectively reduce the overall thickness.

In a further embodiment, the membrane switch module includes a first circuit layer, an interposer, and a second circuit layer. The first circuit layer has a plurality of first electrical contacts corresponding to the button group. The second circuit layer corresponding to the first electrical contact has a plurality of second electrical contacts, the interposer corresponding to the first electrical contact and the second electrical contacts forming a plurality of perforations to achieve an operation signal when applied The effect.

In order to improve the light usage, in the second embodiment, the backlight module may further have a reflective sheet disposed on the bottom side of the thin light guide plate to reflect the light back into the thin light guide plate.

In summary, the thin-type illuminated keyboard and the backlight module with the membrane switch are through a thin light guide plate with a bell-shaped structure, in addition to effectively reducing the overall thickness, in order to meet the market demand and achieve the purpose of weight reduction. It is also possible to avoid excessively reducing the thickness of the thin light guide plate, so that the light source light cannot be completely received by the thin light guide plate. Through the flare of a thin light guide The structure is designed to increase the thickness of the light-incident side surface and conform to the size of the matched light source, thereby improving the utilization rate of light, and the advantages of the light-emitting keyboard and the backlight module are both thin and light and high light utilization.

1‧‧‧Slim light keyboard

10‧‧‧ button group

101‧‧‧Key Cap

1011‧‧‧Predetermined lighting area

102‧‧‧Support

11‧‧‧ frame cover

111‧‧‧Opening

12‧‧‧ Membrane switch module

121‧‧‧ cable

122‧‧‧Flexible components

123‧‧‧First circuit layer

1231‧‧‧First electrical contact

124‧‧‧Intermediary

1241‧‧‧Perforation

125‧‧‧Second circuit layer

1251‧‧‧second electrical contact

13‧‧‧Base

14‧‧‧Thin light guide plate

141‧‧‧ bell structure

1411‧‧‧Bevel

1412‧‧‧Light guide groove

142‧‧‧Into the glossy surface

143‧‧‧Line hole

144‧‧‧Glossy

145‧‧‧Ladder structure

1451‧‧‧ trench

146‧‧‧ first light surface

147‧‧‧Second entrance

148‧‧‧First flared lateral light-in structure

149‧‧‧Second flared lateral light-in structure

15‧‧‧Light source

16‧‧‧reflector

17‧‧‧ bottom case

18‧‧‧Light source strip

19‧‧‧First LED

100‧‧‧second LED

2‧‧‧Backlight module

Fig. 1 is an exploded perspective view showing an embodiment of the present invention.

Fig. 2 is a schematic view showing the assembly of an embodiment of the present invention.

FIG. 3 is a schematic view of a membrane switch module according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a button group according to an embodiment of the present invention.

FIG. 5 is an exploded perspective view showing another embodiment of an embodiment of the present invention.

Figure 6 is an exploded perspective view of another embodiment of the present invention.

Figure 7 is a partial cross-sectional view showing another embodiment of the present invention.

Figure 8 is an exploded perspective view showing another embodiment of another embodiment of the present invention.

Please refer to the figures 1, 2, 3 and 4, which are schematic exploded view, assembly diagram, schematic diagram of the membrane switch module and key switch diagram of the present invention. The present invention discloses a thin illuminated keyboard 1 comprising a plurality of button sets 10, a frame cover 11, a membrane switch module 12, a base 13, a thin light guide plate 14, and a light source 15.

The frame cover 11 has a plurality of openings 111 for providing the button groups 10, and the membrane switch module 12 is disposed on the side of the frame cover 11 and extends with a line 121 for generating signals according to the button group 10 After the components are assembled, the cable 121 is pulled to the outside to be electrically connected to other electronic components, thereby transmitting the signal, and the pedestal 13 is disposed on the side of the membrane switch module 12 for support and The foregoing components are assembled. Preferably, the base 13 is made of a metal material. among them, A plurality of elastic members 122 are disposed on one side of the membrane switch module 12 to allow the user to press the button group 10 to provide a reverse force to the button group 10 to form a reset.

The thin light guide plate 14 is disposed on the side of the pedestal 13 , and the thickness of the thin light guide plate 14 is greater than the other side to form a bell mouth structure 141 , and the thin light guide plate 14 has a maximum thickness on one side of the light incident surface 142 . Preferably, the minimum thickness of the thin light guide plate 14 is between 0.2 and 0.3 mm. In particular, the thin light guide plate 14 can be made by rolling. Since injection molding is limited by the technical limitations of the mold, surface flatness defects are easily generated when producing a thin light guide plate, resulting in a large drop in yield. The pressing method only needs to press the plastic substrate through the embossing roller, so that the thin light guide plate can be quickly and accurately formed, and when a large-sized light guide plate needs to be manufactured, the injection molding can not meet the demand. In addition, a micro-structure (not shown) can be formed on the surface of the thin light guide plate 14 according to the position of each button group 10, so as to facilitate light to form light from the position of the corresponding button group 10.

The light source 15 is disposed corresponding to the light incident surface 142 to form a lateral light incident. More specifically, the light source 15 may be a light strip with LEDs. Due to the limitation of LED packaging technology, the current minimum size LED can only reach a height of about 0.4 mm, which is still beyond the vertical height of the general thin light guide plate 14, so that the light cannot be completely utilized. Therefore, in order to make the thin-type illuminated keyboard 1 both light and thin, and high light utilization efficiency, the present invention adopts a manner that the thin light guide plate 14 forms the bell mouth structure 141 to effectively increase the short side length of the light incident surface 142. The thickness of the thin light guide plate 14 is prevented from being too small to effectively receive the light of the light source 15 completely, so that the light of the light source 15 can enter the thin light guide plate 14 from the light entrance surface 142, and is guided by the light to form light, and the light is applied to the button groups 10 In order to achieve luminous efficacy. Further, the thin type illuminated keyboard 1 may further include a bottom case 17, and the frame cover 10 is combined with each other and the aforementioned components are assembled.

Wherein, if the thickness of the pedestal 13 is high, the membrane switch module 12 can be slightly It is higher than the bell mouth structure 141, and the cable 121 is directly pulled to the outside to make a corresponding electrical connection. However, in order to effectively reduce the overall thickness of the keyboard, the thickness of the pedestal 13 cannot be too large, and when the maximum thickness of the thin light guide plate 14 is between 0.4 and 0.6 mm, the cable 121 is blocked by the bell structure 141, so that the horn is The port structure 141 can be provided with a row of wire holes 143 for providing the wire 121 of the membrane switch module 12. In the present embodiment, the maximum thickness of the thin light guide plate is 0.4 to 0.6 mm. In detail, when the maximum thickness of the thin light guide plate 14 is in the foregoing range, since the side height of the bell mouth structure 141 is high, the cable of the membrane switch module 12 is blocked by the bell mouth structure 141, and cannot be pulled. The external connection is electrically connected to other electronic components, so that the cable 121 passes through the cable hole 143 to extend to the outside. Further, the bell mouth structure 141 has a slope 1411, and the slope 1411 is connected to one of the light-emitting surfaces 144 of the thin light guide plate 14. The wire hole 143 is preferably located at the center of the slope 1411 to facilitate assembly and production. In this embodiment, the light source 15 is set to two.

In the following, the details of the details of the components are further described. Referring to FIGS. 1 and 3 again, in the present embodiment, the membrane switch module 12 includes a first circuit layer 123, an interposer 124, and a second circuit. The layer 125, the first circuit layer 123 has a plurality of first electrical contacts 1231 corresponding to the button groups 10, and the second circuit layer 125 has a plurality of second electrical contacts 1251 corresponding to the first electrical contacts 1231, and the interposer 124 A plurality of vias 1241 are formed between the first circuit layer 123 and the second circuit layer 125 and corresponding to the first electrical contacts 1231 and the second electrical contacts 1251. When any button group 10 is pressed down and touches any of the first electrical contacts 1231, the first electrical contact 1231 is forced to contact the second electrical contact 1251 to be turned on and form a corresponding control signal for the cable. 121 output. The elastic element 122 can be disposed on one side of the first circuit layer 123, so that after the button group 10 is pressed down and the first electrical contact 1231 is in contact with the second electrical contact 1251, the returning force is provided. Key group 10.

In the present embodiment, each button group 10 is also referred to as FIG. 4 again, and includes a key cap 101 and a support member 102 respectively. The support member 102 is disposed on the bottom side of the keycap 101 to provide supporting force. And the keycap 101 has at least one predetermined light emitting area 1011. The key cap 101 is attached to the opening 111 through the support member 102, and the predetermined light-emitting area 1011 has a pattern of numbers or characters, and the light is emitted from the light-emitting surface 144 of the thin-type light guide plate 14 and travels to the button group 10. Then, the predetermined light-emitting area 1011 can be illuminated to display an image corresponding to a number or a character to the user. Wherein, since the light is irradiated from the bottom side of the keycap 101, in order to prevent the support member 102 from blocking the light traveling, or even causing light reflection to affect the display effect of the keycap 101, preferably, the support member 102 can be made transparent. Thereby, when the light travels to the support member 102, it can be penetrated and transmitted to the keycap 101.

Please refer to FIG. 5, which is an exploded perspective view of another embodiment of the present invention. In this embodiment, a reflective sheet 16 is disposed on the bottom side of the thin light guide plate 14 to reflect the light emitted from the bottom surface of the thin light guide plate 14 back into the thin light guide plate 14 for further use to avoid waste of light. In order to improve the light guiding performance of the thin light guide plate 14, the inclined surface 1411 may have a plurality of light guiding grooves 1412 to adjust the light refraction angle of the thin light guiding plate 14 to make the light guiding more uniform. In the embodiment, the light guiding light is guided. The grooves 1412 are arranged in parallel with each other in the inclined surface 1411, but the creation is not limited thereto.

Referring to Figures 1 to 5, the present invention also discloses a backlight module 2 with a membrane switch for use in a thin illuminated keyboard 1, which comprises a membrane switch module 12, a base 13, and a thin guide. Light board 14 and a light source 15. The thin film switch module 12 is provided with a row of wires 121, and the base 13 is disposed on the side of the membrane switch module 12, and the thin light guide plate 14 is disposed on the same. One side of the pedestal 13 and the thickness of the thin light guide plate 14 is larger than the other side to form the bell mouth structure 141, and one side of the thin light guide plate 14 having the largest thickness is the light incident surface 142, and the light source corresponds to the light incident surface. 142 is arranged to form a lateral incoming light. Please refer to the above text for the rest of the technical features.

Similarly, when the maximum thickness of the thin light guide plate 14 is between 0.4 and 0.6 mm, the bell mouth structure 141 is provided with a wire hole 143 for arranging the wire 121 so as to extend therethrough to the outside and other electronic components. Electrical connection. In detail, the bell mouth structure 141 has a slope 1411 connected to the light-emitting surface 144 of the thin light guide plate 14, and the wire hole 143 is located at the center of the slope 1411, thereby improving the convenience of installation and reducing the production difficulty. In addition, the light guiding groove 1412 may be further disposed on the inclined surface 1411 to adjust the angle of the refracting light to make the light guiding more uniform. Furthermore, in order to meet the requirements of thinning, the minimum thickness of the thin light guide plate 14 is preferably between 0.2 and 0.3 mm, and the thickness of the backlight module 2 can be effectively reduced. In addition, in order to improve the light usage rate, part of the light is prevented from overflowing from the bottom side of the thin light guide plate 14. On the bottom side of the thin light guide plate 14, a reflection sheet 16 may be further disposed to reflect the light back into the thin light guide plate 14 for use.

Further, the membrane switch module 12 can include a first circuit layer 123, an interposer 124, and a second circuit layer 125. The first circuit layer 123 has a plurality of first electrical contacts 1231, and the second circuit layer 125 corresponds to The first electrical contacts 1231 have a plurality of second electrical contacts 1251. The interposer 124 is interposed between the first circuit layer 123 and the second circuit layer 125, and corresponds to the first electrical contacts 1231 and the second electrical contacts. Point 1251 forms a plurality of perforations 1241. Please refer to the above text for details.

Please refer to Figures 6 and 7 for an exploded view and assembly diagram of another embodiment of the present invention, and please refer to Figures 3 and 4 for matching. In the present embodiment, the thin illuminated keyboard 1 includes a plurality of button sets 10, a frame cover 11, a membrane switch module 12, a susceptor 13, a thin light guide plate 14, a plurality of first LEDs 19, and a plurality of second LEDs 100. The frame cover 11 has a plurality of openings 111 The membrane switch module 12 is disposed on the side of the frame cover 11 and extends with a wire 121. The base 13 is disposed on the side of the membrane switch module 12. The thin light guide plate 14 is disposed on one side of the base 13 and has a trapezoidal structure 145 at the center. The lower surface of the trapezoidal structure 145 has a groove 1451 for accommodating a light source strip 3, a trapezoidal structure 145 and a groove 1451. The first light-incident surface 146 and the second light-incident surface 147 are formed at the boundary, and the first light-incident surface 146 and the second light-incident surface 147 are disposed opposite to each other. The first LEDs 19 are located on the light strips 18 and are disposed corresponding to the first light incident surface 146 such that the thin light guides 14 form a first flared lateral light incident structure 148. The second LEDs 100 are also disposed on the light source strips 18 and are disposed corresponding to the second light incident surface 147, so that the thin light guide plate 14 forms a second flared lateral light incident structure 149. The light incident surface 146 and the second light incident surface 147 enter the thin light guide plate 14, and the guiding light is formed from the light emitting surface 1411 of the thin light guide plate 14 to provide light to the button group 10. Further, the thin-type illuminated keyboard 1 may further include a bottom case 17, and the frame cover 10 is combined with each other and the components are assembled therein, and the base 13 can be provided with the same type of groove corresponding to the trapezoidal structure 145 for facilitating assembly. It is assembled with the thin light guide plate 14. In the embodiment, the thin light guide plate 14 is configured by the trapezoidal structure 145 and the groove 1451. When the light source strip 18 is disposed on the trench 1451, the thin light guide plate 14 forms a first flared lateral light. Structure 148 and second flared lateral light entrance structure 149. As shown in FIG. 7 , the light passing through the first flared lateral light incident structure 148 and the second flared lateral light incident structure 149 allows the first LED 19 and the second LED 100 to enter the thin light guide plate 14 as much as possible. The overall thickness of the thin light guide plate 14 can be effectively reduced, and the light of each LED can be completely received. Here, in FIG. 7, the structure of the thin light guide plate 14 is facilitated, and only a partial element cross-section is schematically illustrated.

In view of the foregoing, preferably, the thickness of the thin light guide plate 14 is between 0.2~ 0.3mm to meet the needs of thinning. As shown in FIG. 3, the membrane switch module 12 includes a first circuit layer 123, an interposer 124, and a second circuit layer 125. The first circuit layer 123 has a first electrical contact 1231 and a second circuit layer corresponding to the button group 10. The first electrical contact 1231 has a plurality of second electrical contacts 1251, and the interposer has a plurality of through holes 1241 corresponding to the first electrical contacts 1231 and the second electrical contacts 1251. Further, as shown in FIG. 4, each of the key sets 10 includes a keycap 101 and a support member 102 on the bottom side of the keycap 101, respectively, and the keycap 101 has a predetermined light-emitting area 1011. In order to prevent the support member 102 from blocking light conduction, the support member 102 is preferably transparent.

Please refer to FIG. 8 , which is an exploded perspective view of another embodiment of another embodiment of the present invention. In this embodiment, the first flared lateral light-incident structure 148 and the second flared side are shown. The light guiding structure 149 can have a plurality of light guiding grooves 1412 to adjust the incident light angle of the first LED and the second LED to improve the light guiding performance of the thin light guiding plate 14. In addition, the thin-type illuminated keyboard further has a reflective sheet 16 for reflecting the light partially scattered from the thin light guide plate 14 back into the thin light guide plate 14 to continue to utilize, thereby avoiding waste of light.

Please refer to FIGS. 6-8. The present invention also discloses a backlight module 2 with a membrane switch, which is applied to a thin illuminated keyboard 1, which comprises a membrane switch module 12, a base 13, and a thin guide. The light plate 14, the plurality of first LEDs 19, and the plurality of second LEDs 100. The membrane switch module 12 is extended with a wire 121, and the base 13 is disposed on one side of the membrane switch module 12. The thin light guide plate 14 is disposed on one side of the base 13 and has a trapezoidal structure 145 at the center. The lower surface of the trapezoidal structure 145 has a groove 1451 for accommodating a light source strip 18, a trapezoidal structure 145 and a groove 1451. The first light-incident surface 146 and the second light-incident surface 147 are formed at the boundary, and the first light-incident surface 146 and the second light-incident surface 147 are disposed opposite to each other. The first LEDs 19 are located on the light source strip 18 and are disposed corresponding to the first light incident surface 146 to form a first flared lateral light entrance junction on the thin light guide plate 14. Structure 148. The second LEDs 100 are also disposed on the light strips 18 and are disposed corresponding to the second light incident surface 147 to form a second flared lateral light incident structure 149 on the thin light guide 14 . Please refer to the above text for the rest of the technical features.

Similarly, preferably, the thickness of the thin light guide plate 14 is between 0.2 and 0.3 mm to meet the demand for thinning. The membrane switch module 12 includes a first circuit layer 123, an interposer 124, and a second circuit layer 125. The first circuit layer 123 has a first electrical contact 1231 and a second circuit layer 125 corresponding to the first electrical connection. The point 1231 has a plurality of second electrical contacts 1251, and the interposer has a plurality of through holes 1241 corresponding to the first electrical contacts 1231 and the second electrical contacts 1251. Please refer to the above text for the rest of the technical features.

In addition, in order to improve the light guiding performance and the light utilization rate, the first flared lateral light incident structure 148 and the second flared lateral light incident structure 149 may respectively have a plurality of light guiding grooves 1412 for the incident light. Further use. The backlight module 2 can also have a reflective sheet 16 disposed on the bottom side of the thin light guide plate 14, as shown in FIG.

In summary, the thin-type illuminated keyboard and the backlight module with the membrane switch are effectively reduced in thickness by a thin light guide plate having a bell-shaped structure, thereby achieving the purpose of light weight in accordance with market demand, and Avoid excessively reducing the thickness of the thin light guide plate, so that the light source light cannot be received by the thin light guide plate. Through the bell-shaped structure formed on one side or the center of the thin light guide plate, the length of the short side of the light-incident surface is increased to meet the size of the light source, the utilization rate of the light is increased, and the aforementioned illuminated keyboard and the backlight module are both thin and light. The advantage of high light utilization.

However, the above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; therefore, it is equal to the spirit and scope of the present invention. Changes and modifications are to be covered by the scope of this creation.

2‧‧‧Backlight module

10‧‧‧ button group

11‧‧‧ frame cover

111‧‧‧Opening

12‧‧‧ Membrane switch module

121‧‧‧ cable

122‧‧‧Flexible components

13‧‧‧Base

14‧‧‧Thin light guide plate

141‧‧‧ bell structure

1411‧‧‧Bevel

142‧‧‧Into the glossy surface

143‧‧‧Line hole

144‧‧‧Glossy

15‧‧‧Light source

17‧‧‧ bottom case

Claims (28)

A thin-type illuminated keyboard comprising: a plurality of button sets; a frame cover having a plurality of openings for providing the button sets; a membrane switch module disposed on one side of the frame cover and extending with a row of wires; The thin light guide plate is disposed on one side of the base plate, and the thin light guide plate has a thickness larger than the other side to form a bell mouth structure, and the thin light guide plate has the largest One side of the thickness is a light incident surface; and a light source is disposed corresponding to the light incident surface to form a lateral light. The thin-type illuminated keyboard of claim 1, wherein when the maximum thickness of the thin light guide plate is between 0.4 and 0.6 mm, the bell mouth structure defines a wire hole for providing the wire. The thin-type illuminated keyboard of claim 2, wherein the bell mouth structure has a slope, the slope is connected to a light-emitting surface of the thin light guide plate, and the wire hole is located at the center of the slope. The thin-type illuminated keyboard of claim 3, wherein the inclined surface has a plurality of light guiding grooves to enhance the light guiding performance of the thin light guiding plate. The thin type illuminated keyboard of claim 1, wherein the thin light guide plate has a minimum thickness of 0.2 to 0.3 mm. The thin-type illuminated keyboard of claim 1, wherein the membrane switch module comprises a first circuit layer, an interposer layer and a second circuit layer, and the first circuit layer is correspondingly pressed. The key group has a plurality of first electrical contacts, and the second circuit layer has a plurality of second electrical contacts corresponding to the first electrical contacts, the interposer corresponding to the first electrical contacts and the second electrical contacts A plurality of perforations are formed. The thin type illuminated keyboard of claim 1, further comprising a reflective sheet disposed on the bottom side of the thin light guide plate. The thin-type illuminated keyboard of claim 1, wherein each of the button sets includes a keycap and a support member, and the support member is disposed on a bottom side of the keycap to support the keycap, and the support The keycap has at least one predetermined illumination zone. The thin type illuminated keyboard of claim 8, wherein the support member is transparent. A backlight module with a membrane switch for use in a thin type of illuminated keyboard, comprising: a membrane switch module extending with a row of wires; a base disposed on one side of the membrane switch module; a thin guide The light plate is disposed on one side of the base, and the thickness of one side of the thin light guide plate is larger than the other side to form a bell mouth structure, and one side of the thin light guide plate having a maximum thickness is a light incident surface; and a light source, Corresponding to the light entrance surface to form the lateral light. The backlight module with a membrane switch according to claim 10, wherein when the maximum thickness of the thin light guide plate is between 0.4 and 0.6 mm, the bell mouth structure is provided with a row of wire holes for setting The cable. The backlight module with a membrane switch according to claim 11, wherein the bell mouth structure has a slope, and the slope is connected to a light-emitting surface of the thin light guide plate, and the The cable hole is located at the center of the slope. The backlight module with a membrane switch according to the invention of claim 12, wherein the inclined surface has a plurality of light guiding grooves to enhance the light guiding performance of the thin light guiding plate. The backlight module with a membrane switch according to claim 10, wherein the thin light guide has a minimum thickness of 0.2 to 0.3 mm. The backlight module with a membrane switch according to claim 10, wherein the membrane switch module comprises a first circuit layer, an interposer layer and a second circuit layer, wherein the first circuit layer has a plurality of An electrical contact, the second circuit layer corresponding to the first electrical contact having a plurality of second electrical contacts, the interposer corresponding to the first electrical contact and the second electrical contacts forming a plurality of perforations. The backlight module with a membrane switch according to claim 10 further has a reflective sheet disposed on the bottom side of the thin light guide plate. A thin-type illuminated keyboard comprising: a plurality of button sets; a frame cover having a plurality of openings for providing the button sets; a membrane switch module disposed on one side of the frame cover and extending with a row of wires; The thin light guide plate is disposed on one side of the base plate, and the thin light guide plate has a trapezoidal structure at the center thereof, and a lower surface of the trapezoidal structure has a groove for receiving one a light source light bar, the trapezoidal structure and the groove form a first light incident surface and a second light incident surface; a plurality of first LEDs are located on the light source light strip, corresponding to the first light incident surface, to form a a first flared lateral light-in structure; and A plurality of second LEDs are disposed on the light strip of the light source and are disposed corresponding to the second light incident surface to form a second flared lateral light incident structure. The thin-type illuminated keyboard of claim 17, wherein the first bell-shaped lateral light-in structure and the second bell-shaped lateral light-incident structure respectively have a plurality of light-guiding grooves to enhance the The light guiding performance of the thin light guide plate. The thin type illuminated keyboard of claim 17, wherein the thin light guide plate has a minimum thickness of 0.2 to 0.3 mm. The thin-type illuminated keyboard of claim 17, wherein the membrane switch module comprises a first circuit layer, an interposer layer and a second circuit layer, the first circuit layer corresponding to the button group having a plurality of The first electrical contact, the second circuit layer corresponding to the first electrical contact has a plurality of second electrical contacts, the interposer corresponding to the first electrical contact and the second electrical contacts forming a plurality of perforations. The thin type illuminated keyboard of claim 17, further comprising a reflective sheet disposed on the bottom side of the thin light guide plate. The thin-type illuminated keyboard of claim 17, wherein each of the button sets comprises a keycap and a support member, and the support member is disposed on a bottom side of the keycap to support the keycap, and the support The keycap has at least one predetermined illumination zone. The thin type illuminated keyboard of claim 22, wherein the support member is transparent. A backlight module with a membrane switch for use in a thin type of illuminated keyboard, comprising: a membrane switch module extending with a row of wires; a base disposed on one side of the membrane switch module; a thin light guide plate is disposed on a side of the base, the thin light guide plate has a trapezoidal structure at the center thereof, and a lower surface of the trapezoidal structure has a groove for accommodating a light source light strip, the trapezoidal structure and the trench Forming a first light incident surface and a second light incident surface; a plurality of first LEDs are disposed on the light source strip, corresponding to the first light incident surface, to form a first flared lateral light incident structure; And a plurality of second LEDs disposed on the light strip of the light source, corresponding to the second light incident surface, to form a second flared lateral light incident structure. The backlight module with a membrane switch according to claim 24, wherein the first flared lateral light entrance structure and the second flared lateral light entrance structure respectively have a plurality of light guide grooves To enhance the light guiding performance of the thin light guide plate. The backlight module with a membrane switch according to claim 24, wherein the thin light guide has a minimum thickness of 0.2 to 0.3 mm. The backlight module with a membrane switch according to claim 24, wherein the membrane switch module comprises a first circuit layer, an interposer layer and a second circuit layer, and the first circuit layer corresponds to The button group has a plurality of first electrical contacts, and the second circuit layer has a plurality of second electrical contacts corresponding to the first electrical contacts, the interposer corresponding to the first electrical contacts and the second electrical contacts A plurality of perforations are formed. The backlight module with a membrane switch according to claim 24, further comprising a reflective sheet disposed on the bottom side of the thin light guide plate.