TWI816228B - Keyboard and backlight module - Google Patents

Abstract

The present invention discloses a keyboard, which includes a base plate and a backlight module. The base plate has a minor axis direction and a major axis direction, and the base plate includes at least one long slot. The long slot is disposed on the base plate along the minor axis direction, so that a length of the base plate can be adjusted along the major axis direction. The backlight module is disposed on one side of the base plate. The backlight module includes a shielding sheet, a light guide plate and a reflecting sheet. The shielding sheet includes an upper surface and a lower surface, and the upper surface faces toward the base plate. The light guide plate is disposed on the lower surface of the shielding sheet. The reflecting sheet is disposed under the light guide plate. The reflecting sheet includes a plurality of first slits. When the length of the base plate is adjusted along the major axis direction, the reflective sheet can adjust and move corresponding to the base plate by the first slits.

Description

Keyboard and backlight module

The invention relates to a keyboard and a backlight module of the keyboard.

In terms of current computer usage habits, the keyboard is one of the indispensable input devices. The main structure of the keyboard includes the base plate, circuit board and multiple keys. Among them, the base plate is mainly a plate that provides component assembly, and the circuit board and buttons are all arranged on the base plate. Generally speaking, there will be gaps between keys. In order to prevent dust or light leakage, a frame is also set on the upper layer of the keyboard. The frame has a plurality of openings that can accommodate the keys, so that the gaps between the keys can be blocked by the frame. Therefore, the position of each opening of the frame must correspond to the position of each button on the base plate. If the base plate has large tolerances during manufacturing, the buttons assembled on the base plate will not accurately correspond to each opening of the frame, thereby causing assembly difficulties.

In order to improve the overall assembly accuracy of the keyboard, a base plate with long grooves has appeared on the market. Please refer to Taiwan Invention Patent I725438. When the keys on the keyboard cannot be accurately accommodated in the opening of the frame, the long slot structure can be used to appropriately adjust the length of the base plate in the long axis direction, and then adjust the relative position of the keys to correspond to the opening of the frame. .

In addition, keyboards are often equipped with backlight modules to form a luminous keyboard. Generally speaking, the backlight module is fixed to the bottom side of the base plate (that is, the side opposite to the keys) by pasting or riveting. However, when the backlight module is assembled to the base plate, even if the base plate has a long slot, the length of the base plate cannot be adjusted due to the limitation of the backlight module. In other words, existing backlight modules cannot be applied to adjustable-length base plates.

In addition, the light guide plate of the conventional backlight module has holes for setting the light source or for screws to be fastened. In addition, the light guide plate also has a light spot structure. Generally, the light spot structure is formed on the light guide plate by using ink printing. The light is fully reflected in the light guide plate, and when the light contacts the light point structure, it can be guided and projected in the direction of the key, thereby causing the key to produce a luminous effect.

However, the conventional light guide plate does not have a structure designed to concentrate the light on the light spot, thereby reducing the luminous efficiency of the backlight module. In addition, it is known that the light spot structure of conventional light guide plates is often incomplete due to printing, such as missing corners, hollows, or unevenness, which in turn worsens the light reflection effect of the dot-shaped light spot structure and reduces the light conductivity. , which also reduces the luminous efficiency of the backlight module.

In view of the above problems, the main purpose of the present invention is to provide a keyboard and a backlight module that uses a reflective sheet with a slit structure to solve the problem that the conventional backlight module cannot be applied to an adjustable base plate.

In order to achieve the above object, the present invention provides a keyboard, which includes a base plate and a backlight module. The bottom plate has a short axis direction and a long axis direction, and the bottom plate includes at least one long slot. The long slot is provided on the bottom plate along the short axis direction, so that the length of the bottom plate can be adjusted along the long axis direction. The backlight module is arranged on one side of the base plate. The backlight module includes a light shielding sheet, a light guide plate and a reflective sheet. The light-shielding sheet includes an upper surface and a lower surface, and the upper surface faces the base plate. The light guide plate is arranged on the lower surface of the light shielding sheet. The reflective sheet is arranged below the light guide plate. The reflective sheet includes a plurality of first slits. Wherein, when the length of the bottom plate is adjusted along the long axis direction, the first slits can cause the reflective sheet to adjust and move corresponding to the bottom plate.

In order to achieve the above object, the present invention also provides a backlight module applied to a keyboard. The keyboard includes a base plate, and the base plate has a short axis direction and a long axis direction. In addition, the base plate includes at least one long slot, and the long slot is provided on the base plate along the short axis direction. The backlight module is arranged on one side of the base plate. The backlight module includes a light shielding sheet, a light guide plate and a reflective sheet. The light-shielding film includes an upper surface and a lower surface. The upper surface faces the bottom plate. The light guide plate is arranged on the lower surface of the light shielding sheet. The reflective sheet is arranged below the light guide plate. The reflective sheet includes a plurality of first slits. Wherein, when the length of the bottom plate is adjusted along the long axis direction, the first slits can cause the reflective sheet to adjust and move corresponding to the bottom plate.

According to an embodiment of the present invention, two adjacent first slits partially overlap in the short axis direction, and there is a distance between the two adjacent first slits in the long axis direction.

According to an embodiment of the present invention, the reflective sheet includes a plurality of through holes, and one end of some of the first slits is connected to the through holes.

According to an embodiment of the present invention, the through holes include a plurality of fixing holes, and the first slits are arranged between some of the fixing holes to form at least a slit distribution area. In addition, the slit distribution areas are arranged on the reflective sheet along the short axis direction, so that the reflective sheet is divided into a first part and a second part by the slit distribution areas in the long axis direction.

According to an embodiment of the present invention, the first slit includes a straight section, and the straight section and the minor axis direction are parallel to each other.

According to an embodiment of the present invention, part of the first slit further includes a transverse section, and the transverse section is parallel to the long axis direction.

According to an embodiment of the invention, the straight sections and the transverse sections are connected to each other. One end of the straight section or one end of the transverse section is connected to the fixing hole.

According to an embodiment of the present invention, the through holes include a plurality of through holes. The diameter of each through hole is smaller than the diameter of each fixing hole. Furthermore, one end of the first slit is connected to the perforation.

According to an embodiment of the present invention, the distribution position of the slit distribution area corresponds to the arrangement position of the long slit of the base plate.

According to an embodiment of the present invention, the reflective sheet is adhered to the base plate.

According to an embodiment of the present invention, the reflective sheet is adhered to the light-shielding sheet, and the light-shielding sheet includes a plurality of second slits, and the upper surface of the light-shielding sheet is adhered to the base plate.

According to an embodiment of the present invention, the spacing is between 0.01 mm and 0.3 mm.

In order to achieve the above object, the present invention provides a keyboard, which includes a base plate, a plurality of keys and a backlight module. The bottom plate has a short axis direction and a long axis direction. The buttons are arranged on the bottom plate along the long axis direction and arranged in a plurality of rows. The backlight module is arranged on one side of the base plate. The backlight module includes a light shielding sheet, a light guide plate and a reflective sheet. The light-shielding sheet includes an upper surface and a lower surface, and the upper surface faces the base plate. The light guide plate is arranged on the lower surface of the light shielding sheet. The light guide plate includes a plurality of elongated slots, and each of the elongated slots has at least one long side. The long sides and the long axis are parallel to each other, and each of the long slots has a central axis. The central axis is located between the keys in two adjacent rows. The reflective sheet is arranged below the light guide plate.

In order to achieve the above object, the present invention also provides a backlight module applied to a keyboard. The keyboard includes a base plate and a plurality of keys. The bottom plate has a short axis direction and a long axis direction. The buttons are arranged on the base plate along the long axis direction. The backlight module is arranged on one side of the base plate. The backlight module includes a light shielding sheet, a light guide plate and a reflective sheet. The light-shielding sheet includes an upper surface and a lower surface, and the upper surface faces the base plate. The light guide plate is arranged on the lower surface of the light shielding sheet. The light guide plate includes a plurality of elongated slots, and each of the elongated slots has at least one long side. The long sides and the long axis are parallel to each other, and each of the long slots has a central axis. The central axis is located between the keys in two adjacent rows. The reflective sheet is arranged below the light guide plate.

According to an embodiment of the present invention, each of the elongated slots has a rectangular structure.

According to an embodiment of the present invention, the at least one long side of each of the elongated slots is located within the orthographic projection range below the button.

According to an embodiment of the present invention, there is a distance between two adjacent elongated slots in the long axis direction.

According to an embodiment of the present invention, the reflective sheet passes through the elongated slot and is adhered to the light-shielding sheet.

According to an embodiment of the present invention, the length of the long side of the elongated slot is greater than the width of one of the keys.

In order to achieve the above object, the present invention provides a keyboard, which includes a base plate, a plurality of keys and a backlight module. The bottom plate has a short axis direction and a long axis direction. These buttons are arranged on the bottom panel. The backlight module is arranged on one side of the base plate. The backlight module includes a light shielding sheet, a light guide plate and a reflective sheet. The light-shielding sheet includes an upper surface and a lower surface, and the upper surface faces the base plate. The light guide plate is arranged on the lower surface of the light shielding sheet. The light guide plate includes a plurality of light guide structures, and the light guide structures respectively correspond to the buttons. Each of the light guide structures includes an annular portion and at least one continuous fold line portion. The continuous folding line portion is connected to the annular portion, and the annular portion is formed by a plurality of bending portions. The reflective sheet is arranged below the light guide plate.

In order to achieve the above object, the present invention also provides a backlight module applied to a keyboard. The keyboard includes a base plate and a plurality of keys, and the keys are arranged on the base plate. The bottom plate has a short axis direction and a long axis direction. The backlight module is arranged on one side of the base plate. The backlight module includes a light shielding sheet, a light guide plate and a reflective sheet. The light-shielding sheet includes an upper surface and a lower surface, and the upper surface faces the base plate. The light guide plate is arranged on the lower surface of the light shielding sheet. The light guide plate includes a plurality of light guide structures, and the light guide structures respectively correspond to the buttons. Each of the light guide structures includes an annular portion and at least one continuous fold line portion. The continuous folding line portion is connected to the annular portion, and the annular portion is formed by a plurality of bending portions. The reflective sheet is arranged below the light guide plate.

According to an embodiment of the present invention, the keyboard further includes an elastic body, the elastic body has an annular base, and the annular portion is disposed corresponding to the annular base.

According to an embodiment of the present invention, the continuous fold line portion corresponds to one corner of one of the buttons.

According to an embodiment of the present invention, the light guide structure has four continuous folded line portions corresponding to the four corners of the key.

According to an embodiment of the present invention, the light guide structures are a plurality of arc-shaped grooves formed on a surface of the light guide plate.

According to an embodiment of the present invention, the bent portions of the annular portion respectively include a circle, an arc, or a line.

According to an embodiment of the present invention, the lines of the continuous fold line portion are denser than those of the annular portion.

Based on the above, the keyboard according to the present invention includes a base plate and a backlight module. The bottom plate has a long slot arranged along the short axis direction, so that its length can be adjusted. The reflective sheet of the backlight module includes a plurality of (first) slits. Through the aforementioned structure, the reflective sheet can move along with the base plate and adjust its length, thereby allowing the backlight module to adjust its length along with the base plate.

In addition, the light guide plate has a rectangular long slot. That is to say, the elongated slot has at least one long side, and the long side is parallel to the long axis direction of the bottom plate. By arranging the long slotted central axis between two adjacent rows of buttons, the light transmission in the light guide plate is concentrated on the rows where the buttons are arranged, and can be effectively guided to the light guide structure. Improve the luminous efficiency of the backlight module.

In addition, the light guide structure of the light guide plate includes an annular portion and at least one continuous fold line portion, and the continuous fold line portion is connected to the annular portion so that the light in the light guide plate can be concentrated on the annular portion and the continuous fold line portion, especially on the Continuous fold line part. In addition, the structure of the annular part and the continuous folding line part is not likely to produce incomplete phenomena such as obvious missing corners, hollows, or unevenness, so the light reflection effect and light conductivity can be improved, thereby improving the luminous efficiency of the backlight module.

In order to better understand the technical content of the present invention, preferred specific embodiments are described below.

Figure 1 is an exploded schematic diagram of a keyboard according to an embodiment of the present invention. Figure 2 is an exploded schematic diagram of the backlight module shown in Figure 1. Figure 3 is a schematic diagram of the lower surface of the reflective sheet shown in Figure 2. Please refer to the figures at the same time. 1. As shown in Figure 2 and Figure 3. The keyboard 1 of this embodiment includes a base plate 10 , a backlight module 20 , a circuit board 30 and a plurality of keys 40 . Generally speaking, the base plate 10 includes a plurality of assembly areas (not shown) for assembling the buttons 40 . The circuit board 30 is disposed above the base plate 10 and below the buttons 40 . When the button 40 is pressed, the circuit board 30 can be triggered to generate a corresponding input signal.

The bottom plate 10 has a short axis direction Y and a long axis direction X. Specifically, the keyboard 1 has a rectangular appearance. Correspondingly, the base plate 10, the backlight module 20, and the circuit board 30 all have a rectangular appearance, and also have a short axis direction Y and a long axis direction X. In this embodiment, they are The bottom plate 10 is taken as an example for description. In this embodiment, the base plate 10 is made of a metal plate, and the buttons 40 are arranged on the base plate 10 along the long axis direction X and arranged in a plurality of rows R.

In addition, the bottom plate 10 includes at least one long slot 11. This embodiment takes two long slots 11 as an example, as shown in FIG. 1 . The long slot 11 is provided on the base plate 10 along the short axis direction Y. The base plate 10 is provided with a plurality of elastic connectors 111 on the long slot 11 so that the boards divided by the long slot 11 can be connected to each other and assembled accordingly. Requires relative movement and adjustment of position. In the aforementioned manner, the length of the bottom plate 10 can also be adjusted, and the bottom plate 10 will not be divided into multiple independent boards. Since the structure and arrangement of the elastic connector 111 are not the focus of this case, they will not be described in detail here. When the two short sides of the bottom plate 10 are pulled outward or pushed inward, the width of the long slot 11 can be increased or decreased, thereby adjusting the length of the bottom plate 10 in the long axis direction X, thereby fine-tuning the length of the bottom plate 10 Button 40 position. Preferably, the long slot 11 does not traverse the bottom plate 10 , but is bent and arranged on the bottom plate 10 to avoid the placement position of the button 40 . In other embodiments, the base plate 10 may also have a plurality of shorter elongated slots 11 , and two adjacent elongated slots 11 have a spacing in the long axis direction X.

In this embodiment, the backlight module 20 is disposed on one side of the base plate 10 and is located on the side of the base plate 10 relative to the button 40 . The backlight module 20 includes a light shielding sheet 21 , a light guide plate 22 and a reflective sheet 23 . The light-shielding sheet 21 includes an upper surface 211 and a lower surface 212 , and the upper surface 211 faces the base plate 10 . The light guide plate 22 is disposed on the lower surface 212 of the light shielding sheet 21 , and the reflective sheet 23 is disposed below the light guide plate 22 . In other words, the light guide plate 22 is provided between the light shielding sheet 21 and the reflective sheet 23 .

Generally speaking, the light-shielding sheet 21 has a light-shielding portion and a plurality of light-transmitting portions (not shown in the figure). The plurality of light-transmitting portions are used to respectively correspond to the buttons 40 to allow the light emitted by the backlight module 20 to illuminate the buttons. 40. The light-shielding part is used to block parts that do not need to emit light, such as the gaps between the buttons 40. In this embodiment, the light-shielding sheet 21 is made of a light-transmissive film (such as Polyethylene Terephthalate, PET), and The light-shielding part is printed on the light-transmitting film. In addition, the backlight module 20 also has at least one light-emitting unit (not shown in the figure, such as a light-emitting diode), which is arranged on the side of the light guide plate 22, and the light emitted by the light-emitting unit is uniformly guided by the light guide plate 22. to the entire surface of the light guide plate 22 . The reflective sheet 23 is used to reflect light to the buttons 40 to increase the luminous efficiency of the backlight module 20. Preferably, the reflective sheet 23 is made of a diaphragm material. The reflective sheet 23 can be provided with a reflective surface on the side facing the light guide plate 22. Or apply reflective material to achieve the purpose of reflecting light. Specifically, the light emitted from the light guide plate 22 can directly pass through the light-transmitting part of the light-shielding sheet 21 , or be reflected by the reflective sheet 23 to the light-transmitting part, and then the light can be transmitted on the key surface or the periphery of the key 40 .

In this embodiment, the reflective sheet 23 is the bottom layer of the backlight module 20 . In addition, the reflective sheet 23 also has an upper surface 231 and a lower surface 232. Among them, FIG. 3 shows the lower surface 232 of the reflective sheet 23 . Figure 4 is a schematic plan view of the reflective sheet shown in Figure 3. Please refer to Figures 1, 2, 3 and 4 at the same time. The reflective sheet 23 of this embodiment includes a plurality of first slits 233 . When the length of the base plate 10 is adjusted along the long axis direction

Specifically, two adjacent first slits 233 partially overlap in the minor axis direction Y. Specifically, the first slits 233 in this embodiment are arranged in a straight direction, which are called straight sections 2331 here. The straight section 2331 is parallel to the minor axis direction Y. Therefore, the two adjacent first slits 233 at least partially overlap in the minor axis direction Y, and may also completely overlap. In addition, there is a distance S between two adjacent first slits 233 in the long axis direction X. Preferably, the distance S can be between 0.01 mm and 0.3 mm.

By having a structure in which the reflective sheet 23 has a plurality of first slits 233 and two adjacent first slits 233 partially overlap in the short axis direction Y and have a spacing S in the long axis direction X, the backlight module 20 can As the base plate 10 adjusts its length. Specifically, when the two short sides of the bottom plate 10 are pulled outward, the length of the bottom plate 10 in the long axis direction X is increased through the structure of the long slot 11 . At the same time, as the two short sides of the reflective sheet 23 move outward with the base plate 10 , the first slit 233 can be opened, thereby increasing the length of the reflective sheet 23 in the long axis direction X. Therefore, the length of the reflective sheet 23 disposed on the bottom layer of the backlight module 20 can be adjusted along with the base plate 10 . In short, the backlight module 20 of this embodiment can be applied to the length-adjustable base plate 10 .

The reflective sheet 23 includes a plurality of through holes, including a plurality of fixing holes 234 and a plurality of through holes 235 . In other words, the through holes include two types: fixing holes 234 or through holes 235. In this embodiment, the through holes 235 and the fixing holes 234 are both round holes, and the aperture of the through holes 235 is smaller than the aperture of the fixing holes 234. However, the present invention does not use this method. To this end, the shape and size of the through hole 235 and the fixing hole 234 can also be adjusted according to actual needs. The fixing holes 234 are used for screws and other fixing elements to pass through to assemble the backlight module 20 , for example, to lock the electronic components of the backlight module 20 , or to assemble the backlight module 20 to the base plate 10 . In this embodiment, the first slits 233 are arranged between some of the fixing holes 234 to form at least a slit distribution area A. In addition, the slit distribution area A is mainly arranged on the reflection sheet 23 along the short axis direction Y, so that the reflection sheet 23 is divided into a first part A1 and a second part A2 in the long axis direction X by the slit distribution area A. Preferably, the distribution position of the slit distribution area A may correspond to the position of the long slit 11 of the base plate 10 (as shown in Figure 1).

As shown in FIGS. 3 and 4 , the first slits 233 of this embodiment are arranged to form two slit distribution areas A, thereby dividing the reflective sheet 23 into two first parts A1 and a second part A2. Among them, the first part A1 is on the outside, and the second part A2 is in the middle. When the two short sides of the reflective sheet 23 move outward along with the base plate 10 , the width of the first slit 233 increases, causing the first part A1 and the second part A2 to move away from each other, thereby increasing the distance between the reflective sheet 23 and the long axis direction X length.

In this embodiment, one end of part of the first slit 233 is connected to a through hole, such as a fixing hole 234 or a through hole 235, so as to increase the amplitude or width of the first slit 233. In addition, the opposite ends of part of the first slit 233 are connected to the fixing hole 234 and the through hole 235 respectively. This structure can also achieve the effect of increasing the width of the first slit 233 and can increase the stretching of the reflective sheet 23 The width is to prevent the reflective sheet 23 from being damaged when stretched.

FIG. 5 is a schematic plan view of a reflective sheet according to another embodiment of the present invention. Please refer to FIG. 5 . In this embodiment, the first slit 233a of the reflective sheet 23a includes a straight section 2331a. The difference from the previous embodiment is that part of the first slit 233a also includes a transverse section 2332a, and the straight section 2331a and transverse section 2332a are interconnected. Preferably, the straight section 2331a and the short axis direction Y are parallel to each other, and the transverse section 2332a is parallel to the long axis direction X, so that the angle between the straight section 2331a and the transverse section 2332a is 90 degrees, but the present invention does not With this limitation, the angle between the straight section 2331a and the transverse section 2332a can also be adjusted according to actual needs.

Similarly, providing through holes (fixing holes 234a or perforations 235a) at both ends of the first slit 233a can increase the stretching range of the reflective sheet 23a, thereby preventing the reflective sheet 23a from being damaged during stretching. Preferably, one end of the straight section 2331a or one end of the transverse section 2332a is connected to the fixing hole 234a. In this embodiment, one end of the transverse section 2332a is connected to the fixing hole 234a. Similarly, the reflective sheet 23a of this embodiment includes a plurality of through holes 235a, and the opposite ends of part of the first slits 233a are respectively connected to the fixing holes 234a and the through holes 235a. In this embodiment, one end of the transverse section 2332a is connected to the fixing hole 234a, and one end of the straight section 2331a is connected to the through hole 235a; The opposite ends of the slit 233a) are respectively connected to the fixing hole 234a and the through hole 235a. In other embodiments, the straight section 2331a can also be connected to the fixing hole 234a, and the transverse section 2332a can be connected to the through hole 235a.

Figure 6 is a schematic cross-sectional view of the keyboard shown in Figure 1 after assembly. Figure 7 is a schematic plan view of the light guide plate shown in Figure 2. Please refer to Figures 2, 6 and 7. It should be noted that FIG. 6 is a schematic cross-sectional view of the combined keyboard 1 in the short axis direction Y. In this embodiment, the upper surface 231 of the reflective sheet 23 is adhered to the lower surface 212 of the light-shielding sheet 21 , and the upper surface 211 of the light-shielding sheet 21 is adhered to the base plate 10 . For example, the backlight module 20 further includes an adhesive layer 24 disposed on the upper surfaces 231 and 211 of the reflective sheet 23 and the light-shielding sheet 21 respectively. After the reflective sheet 23 covers the light guide plate 22 and is adhered to the light-shielding sheet 21 through the adhesive layer 24 , the backlight module 20 is assembled (glued) to the base plate 10 through the adhesive layer 24 located on the upper surface 211 of the light-shielding sheet 21 .

Specifically, the light guide plate 22 of this embodiment includes a plurality of elongated slots 221 , which allow the reflective sheet 23 to pass through the elongated slots 221 and be adhered to the light shielding sheet 21 . The long slot 221 of the light guide plate 22 has at least one long side 222 . In this embodiment, the elongated slot 221 has two long sides 222 that are parallel to each other. The elongated slot 221 also has a central axis 226 that is parallel to the long sides 222 . It should be noted that the central axis 226 is a virtual reference line, so it is represented by a dotted line in FIGS. 2 and 7 , and the central axis 226 of two elongated slots 221 is shown. The long side 222 and the long axis direction In other words, the long slot 221 in this embodiment has a rectangular structure and corresponds to the non-transparent area of the keyboard 1 . Generally speaking, the key 40 has light-transmitting characters, so the area between two adjacent rows R is a non-light-transmitting area. The central axis 226 of the elongated slot 221 is configured to correspond to a structure with no light-transmitting area. Since the hollow area of the elongated slot 221 cannot transmit light, the elongated slot 221 can not only save the manufacturing cost of the light guide plate 22, but also can The light transmission in the light guide plate 22 is concentrated on the rows R where the buttons 40 are arranged, so as to improve the luminous efficiency of the backlight module 20 . Specifically, the light will be transmitted in the light guide plate 22 and emitted from the edge of the hole in the light guide plate 22 , so the edge of the long slot 221 will have higher brightness. Preferably, at least one long side 222 of the elongated slot 221 can be arranged within the orthographic projection range P below the light-transmitting characters of the keys 40 in two adjacent rows R (as shown in the dotted box in Figure 7). to increase luminous efficiency.

Preferably, the length of the long side 222 of the long slot 221 is greater than the width of one of the buttons 40 . In other words, the length of the long side 222 is greater than the width of a single button. The range of the long side 222 in this embodiment can cover 2 to 4 buttons, and there is a distance between two adjacent long slots 221 in the long axis direction X. S1 (as shown in FIG. 7 ), the light guide plate 22 will not be broken due to the division of the long slot 221, so as to maintain the integrity of the light guide plate 22. Preferably, the light emitted by the light-emitting unit and the long side 222 are parallel to each other, which is beneficial to improving the efficiency of light transmission.

In addition, the light guide plate 22 of this embodiment also includes a plurality of light guide structures 223, and the positions of the light guide structures 223 respectively correspond to the buttons 40. It should be noted that, for simplicity, two light guide structures 223 are shown in FIGS. 2 and 7 . In implementation, the light guide structure 223 can be formed at a position corresponding to each button 40 . In this embodiment, the light guide structure 223 is a microstructure (such as an arc-shaped groove) formed on one surface of the light guide plate 22 to destroy the total reflection of light in the light guide plate 22 , thereby reducing the total reflection of light in the light guide plate 22 . The light is guided upward to the corresponding key 40, thereby causing the keyboard 1 to emit light. In this embodiment, the plurality of light guide structures 223 is disposed on the upper surface of the light guide plate 22 . The present invention is not limited thereto. It can also be disposed on the lower surface of the light guide plate 22 or on both the upper and lower surfaces of the light guide plate 22 according to actual needs. lower surface.

In this embodiment, each light guide structure 223 includes an annular portion 224 and at least one continuous folded line portion 225, and the continuous folded line portion 225 is connected to the annular portion 224. An elastic body (not shown) is provided between the button 40 and the bottom plate 10. The elastic body can be a rubber dome. The elastic body has an annular base. Preferably, the annular portion 224 is arranged corresponding to the annular base of the elastic body. , specifically, the annular portion 224 can be provided on the outer edge or below the annular base to ensure uniform brightness in the central area of the key 40 . In addition, the annular portion 224 is formed by a plurality of bending portions 2241, and the bending portions 2241 can be, for example, but not limited to, circular, arc-shaped, or linear. The bent portion 2241 of this embodiment is circular, so that the annular portion 224 forms a structure like a telephone coil, as shown in FIG. 7 . In other embodiments, if the bent portion 2241 is arc-shaped or semicircular, the entire annular portion 224 can present a petal-shaped annular structure. If the bent portion 2241 is linear, the entire annular portion 224 can have a zigzag annular structure. In addition, the continuous folding line portion 225 has a bent linear structure, and the lines of the continuous folding line portion 225 are denser and more concentrated than the annular portion 224 .

Among them, the aforementioned long slot 221 can concentrate the light in the light guide plate 22 in the area with the light guide structure 223, and the light guide structure 223 can further concentrate the light completely, which means that the light can be concentrated on the annular portion 224 and the continuous fold line portion. 225, especially concentrated on the continuous fold line portion 225. The structure of the annular portion 224 and the continuous folded portion 225 destroys the total reflection of light, causing the light to be projected upward to the button 40, so that the button 40 has a bright display effect. Generally speaking, the characters of the button 40 are light emitting areas, so the position of the continuous fold line portion 225 can correspond to the characters of the button 40 . For example, the characters of the key 40 are often located at one corner of the key 40 , so the continuous fold line portion 225 corresponds to one corner of the key 40 . In this embodiment, the light guide structure 223 has four continuous folded line portions 225 corresponding to the four corners of the button 40 . Compared with the conventional light spot structure, the annular portion 224 and the continuous folded line portion 225 of the light guide structure 223 are not prone to obvious incomplete phenomena such as missing corners, hollows, or unevenness, so the light reflection effect and light guide can be improved. efficiency, thereby improving the luminous efficiency of the backlight module 20.

Preferably, the light guide structure 223 of this embodiment is a plurality of arc-shaped grooves formed on the surface of the light guide plate 22, as shown in FIG. 6 . Specifically, the light guide structure 223 can be formed on the surface of the light guide plate 22 by roll forming, and the roll forming can form an arc-shaped groove with a gentle angle. As the backlight module 20 develops in the direction of thinning, the thickness of the light guide plate 22 becomes thinner and thinner. Generally, when microstructures are formed on the light guide plate 22 by hot pressing or laser engraving, the microstructures will be relatively sharp grooves, thus causing damage to the thin light guide plate 22 . On the contrary, the light guide structure 223 of this embodiment is an arc-shaped groove structure, which can avoid damage to the thin light guide plate 22 .

Preferably, as shown in FIG. 2 , the light-shielding sheet 21 of this embodiment may also include a plurality of slits, which are referred to as second slits 213 here. Therefore, when the two short sides of the base plate 10 are pulled outward, the two short sides of the light shielding sheet 21 and the reflective sheet 23 can move outward with the base plate 10 , so that the second slit 213 of the light shielding sheet 21 and the reflective sheet 23 The first slit 233 can be opened, and then can be applied to the base plate 10 with adjustable length. Preferably, the distribution of the second slits 213 of the light-shielding sheet 21 can correspond to the first slits 233 of the reflective sheet 23 , that is, the second slits 213 of the light-shielding sheet 21 can also be arranged in the slit distribution area A Similar shapes.

It should be noted that the first slit 233 of the reflective sheet 23 and the second slit 213 of the light-shielding sheet 21 may cause light leakage. In order to improve this phenomenon, since the distance between the adjacent two elongated slots 221 in the long axis direction The spacing S1 on , to improve the phenomenon of light leakage. In addition, the first slit 233 area of the reflective sheet 23 (upper surface 231 ) and the second slit 213 area of the light-shielding sheet 21 (lower surface 212 ) can be coated with black ink to improve light leakage.

FIG. 8 is a schematic cross-sectional view of a keyboard according to another embodiment of the present invention. Please refer to FIG. 8 . The difference between the keyboard 1b of this embodiment and the previous embodiment lies in the backlight module 20b, so the base plate 10, circuit board 30 and keys 40 use the component symbols of the previous embodiment. In this embodiment, the light-shielding sheet 21b and the light guide plate 22b have long slots (ie, the cut-off portions of the light-shielding sheet 21b and the light guide plate 22b in Figure 8), so that the reflective sheet 23b can pass through the light-shielding sheet 21b and the light guide plate 22b. And directly adhered to the base plate 10. Specifically, the adhesive layer 24b can be disposed on the periphery of the reflective sheet 23b. In addition, the adhesive layer 24b is disposed at intervals on the upper surface 231b of the reflective sheet 23b, and the portion of the reflective sheet 23b with the adhesive layer 24b passes through the light shielding sheet. 21b and light guide plate 22b to be adhered to the base plate 10 . The light-shielding sheet 21b and the light guide plate 22b are covered by the reflective sheet 23b and fixed between the reflective sheet 23b and the bottom plate 10 . In this embodiment, since the reflective sheet 23b is directly adhered to the base plate 10, the light-shielding sheet 21b does not need to have a (second) slit, and the backlight module 20b can also be applied to the base plate 10 with adjustable length.

To sum up, the keyboard according to the present invention includes a base plate and a backlight module. The bottom plate has a long slot arranged along the short axis direction, so that its length can be adjusted. The reflective sheet of the backlight module includes a plurality of (first) slits. The structure of the slits allows the reflective sheet to move along with the base plate and adjust its length, thereby allowing the backlight module to adjust its length along with the base plate.

In addition, the light guide plate has a rectangular long slot. That is to say, the elongated slot has at least one long side, and the long side is parallel to the long axis direction of the bottom plate. By arranging the long slotted central axis between two adjacent rows of buttons, the light transmission in the light guide plate is concentrated on the rows where the buttons are arranged, and can be effectively guided to the light guide structure. Improve the luminous efficiency of the backlight module.

In addition, the light guide structure of the light guide plate includes an annular portion and at least one continuous fold line portion, and the continuous fold line portion is connected to the annular portion so that the light in the light guide plate can be concentrated on the annular portion and the continuous fold line portion, especially on the Continuous fold line part. In addition, the structure of the annular part and the continuous folding line part is not likely to produce incomplete phenomena such as obvious missing corners, hollows, or unevenness, so the light reflection effect and light conductivity can be improved, thereby improving the luminous efficiency of the backlight module.

It should be noted that the above-mentioned embodiments are examples for convenience of explanation, and the scope of rights claimed by the present invention should be subject to the scope of the patent application, and is not limited to the above-mentioned embodiments.

1. 1b: Keyboard 10: Bottom plate 11: Long groove 111: Elastic connector 20, 20b: Backlight module 21, 21b: shading film 211: Upper surface 212: Lower surface 213: Second slit 22, 22b: light guide plate 221: Long slotting 222:Long side 223:Light guide structure 224: Ring part 2241: Bending part 225: Continuous fold line part 226: Central axis 23, 23a, 23b: Reflective sheet 231: Upper surface 232, 232a: Lower surface 233, 233a: first slit 2331, 2331a: straight section 2332a: Horizontal section 234, 234a: Fixing hole 235, 235a: perforation 24, 24b: Adhesive layer 30:Circuit board 40:Button A: Cutting seam distribution area A1:Part 1 A2:Part 2 P: orthographic projection range R: horizontal row S, S1: spacing X: Long axis direction Y: Short axis direction

FIG. 1 is an exploded schematic diagram of a keyboard according to an embodiment of the present invention. FIG. 2 is an exploded schematic diagram of the backlight module shown in FIG. 1 . FIG. 3 is a schematic diagram of the lower surface of the reflective sheet shown in FIG. 2 . FIG. 4 is a schematic plan view of the reflective sheet shown in FIG. 3 . FIG. 5 is a schematic plan view of a reflective sheet according to another embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of the keyboard shown in FIG. 1 after assembly. FIG. 7 is a schematic plan view of the light guide plate shown in FIG. 2 . FIG. 8 is a schematic cross-sectional view of a keyboard according to another embodiment of the present invention.

20:Backlight module

21:Shading film

211: Upper surface

212: Lower surface

213: Second slit

22:Light guide plate

221: Long slotting

222:Long side

223:Light guide structure

226: Central axis

23: Reflective sheet

231: Upper surface

232: Lower surface

233: slit

Claims (26)

A keyboard including: A base plate with a short axis direction and a long axis direction, the base plate including at least one long slot, the long slot is provided on the base plate along the short axis direction, so that the length of the base plate can be adjusted along the long axis direction; as well as A backlight module is provided on one side of the base plate. The backlight module includes: A light-shielding sheet includes an upper surface and a lower surface, the upper surface facing the base plate; A light guide plate is provided on the lower surface of the light shielding sheet; and A reflective sheet is disposed below the light guide plate. The reflective sheet includes a plurality of first slits. When the length of the base plate is adjusted along the long axis direction, the first slits can make the reflective sheet correspond to the base plate. Adjust movement. The keyboard of claim 1, wherein two adjacent first slits partially overlap in the short axis direction, and there is a distance between two adjacent first slits in the long axis direction. The keyboard of claim 1, wherein the reflective sheet includes a plurality of through holes, and one end of some of the first slits is connected to the through holes. The keyboard of claim 3, wherein the through holes include a plurality of fixing holes, and the first slits are arranged between part of the fixing holes to form at least a slit distribution area, and the slit distribution area is along The reflective sheet is arranged along the short axis direction, so that the reflective sheet is divided into a first part and a second part by the slit distribution area in the long axis direction. The keyboard of claim 1, wherein each of the first slits includes a straight section, and the straight section is parallel to the minor axis direction. The keyboard of claim 5, wherein some of the first slits further include a transverse section, and the transverse section is parallel to the long axis direction. The keyboard of claim 6, wherein the straight section and the transverse section are connected to each other, and one end of the straight section or one end of the transverse section is connected to the fixing hole. The keyboard of claim 4, wherein the through holes include a plurality of perforations, the diameter of each of the perforations is smaller than the diameter of each of the fixing holes, and one end of some of the first slits is connected to the perforations. The keyboard according to claim 4, wherein the distribution position of the slit distribution area corresponds to the arrangement position of the long slit of the base plate. The keyboard of claim 1, wherein the reflective sheet is adhered to the base plate. The keyboard of claim 1, wherein the reflective sheet is adhered to the light-shielding sheet, and the light-shielding sheet includes a plurality of second slits, and the upper surface of the light-shielding sheet is adhered to the base plate. The keyboard of claim 1, wherein the spacing is between 0.01 mm and 0.3 mm. The keyboard as described in request item 1 further includes: A plurality of buttons are arranged on the base plate along the long axis direction and arranged in a plurality of horizontal rows; The light guide plate includes a plurality of elongated slots, each of the elongated slots has at least one long side, the long side is parallel to the long axis direction, and each of the elongated slots has a central axis, and the central axis is located at the corresponding Between the keys in the adjacent rows. The keyboard according to claim 13, wherein the at least one long side of each of the long slots is located within the orthographic projection range below the key. The keyboard according to claim 13, wherein each of the long slots has a rectangular structure. The keyboard of claim 13, wherein there is a distance between two adjacent elongated slots in the long axis direction. The keyboard of claim 13, wherein the reflective sheet passes through the elongated slot and is adhered to the light-shielding sheet. The keyboard of claim 13, wherein the length of the long side of the elongated slot is greater than the width of one of the keys. The keyboard as described in request item 1 further includes: A plurality of buttons are provided on the base plate; The light guide plate includes a plurality of light guide structures. The light guide structures respectively correspond to the buttons. Each of the light guide structures includes an annular portion and at least one continuous fold line portion. The continuous fold line portion is connected to the annular portion, and the The annular portion is formed by a plurality of bent portions. The keyboard of claim 19, wherein the keyboard further includes an elastic body, the elastic body has an annular base, and the annular portion is arranged corresponding to the annular base. The keyboard of claim 19, wherein the continuous fold line portion corresponds to one corner of one of the keys. The keyboard of claim 21, wherein the light guide structure has four continuous fold line portions corresponding to the four corners of the key. The keyboard of claim 19, wherein the light guide structures are a plurality of arc-shaped grooves formed on a surface of the light guide plate. The keyboard of claim 19, wherein the bent portions of the annular portion respectively include a circle, an arc, or a line. The keyboard according to claim 19, wherein the lines of the continuous fold line portion are denser than those of the annular portion. A backlight module applied to a keyboard. The keyboard includes a bottom plate. The bottom plate has a short axis direction and a long axis direction. The bottom plate includes at least one long slot. The long slot is arranged along the short axis direction. On the base plate, the backlight module is arranged on one side of the base plate so that the length of the base plate can be adjusted along the long axis direction, and the backlight module includes: A light-shielding sheet includes an upper surface and a lower surface, the upper surface facing the base plate; A light guide plate is provided on the lower surface of the light shielding sheet; and A reflective sheet is disposed below the light guide plate. The reflective sheet includes a plurality of first slits. When the length of the base plate is adjusted along the long axis direction, the first slits can make the reflective sheet correspond to the base plate. Adjust movement.