CN110033974B - Keyboard with a keyboard body - Google Patents
Keyboard with a keyboard body Download PDFInfo
- Publication number
- CN110033974B CN110033974B CN201810030684.8A CN201810030684A CN110033974B CN 110033974 B CN110033974 B CN 110033974B CN 201810030684 A CN201810030684 A CN 201810030684A CN 110033974 B CN110033974 B CN 110033974B
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- key
- switch
- keyboard
- control unit
- key information
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
- H01H13/704—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by the layers, e.g. by their material or structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/78—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
- H01H13/807—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the spatial arrangement of the contact sites, e.g. superimposed sites
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2231/00—Applications
- H01H2231/002—Calculator, computer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2239/00—Miscellaneous
- H01H2239/03—Avoiding erroneous switching
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- Input From Keyboards Or The Like (AREA)
Abstract
The invention relates to a keyboard which comprises a plurality of keys, a supporting plate and a film switch circuit. The membrane switch circuit comprises a first upper key switch and a first lower key switch, and the first upper key switch can output first key information corresponding to the keys when being triggered by the keys. The first key-press switch can output second key-press information corresponding to the key-press when being triggered by the key-press. The control unit is connected with the membrane switch circuit and can output corresponding key signals according to the received first key information and the second key information. And when the control unit only receives the first key information or the second key information, the control unit does not output the key signal. The keyboard of the invention can avoid ghost keys.
Description
Technical Field
The present invention relates to a keyboard, and more particularly, to a keyboard including a membrane switch circuit.
Background
Common peripheral input devices for computers include mice, keyboards, trackballs, etc., wherein the keyboard can directly input characters and symbols to the computer, and therefore, the users and manufacturers of the input devices pay attention to the input devices. Among them, a keyboard including a scissors-type connecting element is more common.
The structure of the keyboard including the scissors-type connecting element is described next. Please refer to fig. 1, which is a schematic sectional view of a conventional keyboard. The conventional keyboard 1 includes a plurality of keys 10, a membrane switch circuit 11 and a supporting plate 12, and each key 10 includes a key cap 101, a scissors-type connecting element 102 and an elastic element 103. In the key 10, the key cap 101 is exposed outside the conventional keyboard 1 and can be pressed by a user, the scissors-type connecting element 102 is used to connect the key cap 101 and the supporting plate 12, and the elastic element 103 passes through the scissors-type connecting element 102 and contacts with the key cap 101 and the membrane switch circuit 11 respectively. The supporting board 12 is located below the membrane switch circuit 11, and can carry the key cap 101, the scissors-type connecting element 102, the elastic element 103, and the membrane switch circuit 11 thereon.
The membrane switch circuit 11 includes an upper circuit board 111, a separation layer 112 and a lower circuit board 113, the upper circuit board 111 has a plurality of upper contacts 1111, the separation layer 112 is located below the upper circuit board 111, and has a plurality of separation layer openings 1121 corresponding to the plurality of upper contacts 1111. The lower circuit board 113 is located below the separation layer 112, and has a plurality of lower contacts 1131 corresponding to the plurality of upper contacts 1111, which form a plurality of key contacts with the plurality of upper contacts 1111. On the other hand, each elastic element 103 is disposed on the membrane switch circuit 11 and corresponds to a key contact.
Next, an operation of the conventional keyboard 1 in which the keys 10 are pressed by the user will be described. In fig. 1, when the user presses the key cap 101, the key cap 101 is forced to push the scissors-type connecting element 102 to move, so that the key cap 101 can move downward relative to the supporting plate 12 and press the corresponding elastic element 103. At this time, the elastic element 103 deforms and presses the membrane switch circuit 11 to trigger the key switch of the membrane switch circuit 11, so that the membrane switch circuit 11 outputs a corresponding key signal. When the user stops pressing the key cap 101, the key cap 101 is no longer stressed and stops pressing the elastic element 103, so that the elastic element 103 is restored by the elasticity thereof, and meanwhile, the upward elastic restoring force is provided, and the key cap 101 is pushed back to the position before being pressed. The above is the structure and operation of the existing keyboard.
The main design of the keyboard is to arrange a plurality of keys in a matrix (KeyboardMatrix) and define the matrix as a keyboard matrix. When the user touches the key cap, the key information touched by the user can be displayed according to the information of the Column (Column) and the Row (Row) through a keyboard controller (keyboard controller), and corresponding key signals are output. Each row and column staggered point in the keyboard matrix corresponds to a key contact, and when the key cap is triggered, the keyboard controller scans rows and columns to inquire which key cap is pressed. For example, the keyboard controller may scan each row of the keyboard matrix in sequence, and if the keyboard controller receives a corresponding signal in a certain row when the keyboard controller scans to a certain row, the keyboard controller may determine which key cap is pressed according to the received row and column information.
The minimum matrix unit formed in the keyboard matrix is composed of four keys, and corresponding key signals can be smoothly output when any one key is pressed down in the four keys. When two keys are touched and pressed randomly, the keyboard controller can also judge which keys are triggered according to the row and column information. However, when any three keys are pressed simultaneously, the keyboard matrix transmits two rows of information and two columns of information to the keyboard controller, and because four keys can be formed by two rows and two columns, the keyboard controller cannot deduce which three keys of the four keys are pressed only by means of the row and column information. In this case, the fourth key that is erroneously determined to be turned on is called a ghost key (GhostKey).
In order to prevent ghost bonds, two common methods are generally used: the first way is to arrange a diode near the corresponding key contact, which can make the current in the membrane switch circuit only flow in a single direction, thereby avoiding the misjudgment caused by ghost keys. However, the method of disposing a diode near each key contact has the following disadvantages: first, the cost of the diode is high, which leads to an increase in the cost of the keyboard. Second, the arrangement of the plurality of diodes on the thin film switch circuit increases the thickness of the thin film switch circuit, which is not favorable for the volume lightening of the keyboard. Third, this approach requires a diode to be soldered in the vicinity of each key contact, which is too complicated.
In the second method, the keyboard matrix is not disposed in the keyboard, but the output circuit of each key is connected to the microprocessor in the keyboard. This results in an excessive number of output lines that are difficult to configure. For example: the keyboard includes 144 keys, which has 144 output circuits, so that it is difficult for manufacturers to arrange a large number of output circuits.
Therefore, a keyboard capable of preventing ghost keys is needed, and the cost can be reduced.
Disclosure of Invention
The invention aims to provide a keyboard which can reduce cost and has a ghost key prevention function.
In a preferred embodiment, the present invention provides a keyboard, which includes a first key, a membrane switch circuit and a control unit. The first key is exposed outside the keyboard, and the membrane switch circuit is positioned below the first key and is used for being pressed by the first key. The membrane switch circuit comprises a first upper key switch and a first lower key switch, wherein the first upper key switch corresponds to the first key and is used for outputting first key information corresponding to the first key when the first upper key switch is triggered by the first key. The first lower key switch corresponds to the first key and is positioned below the first upper key switch, and is used for outputting second key information corresponding to the first key when the first lower key switch is triggered by the first key. The control unit is connected with the membrane switch circuit and used for outputting a corresponding key signal according to the received first key information and the second key information; when the control unit receives the first key information and the second key information, the control unit outputs the key signal corresponding to the first key; and when the control unit only receives the first key information or the second key information, the control unit does not output the key signal corresponding to the first key.
In a preferred embodiment, the first upper row line and the first upper column line form the first upper key switch, the second upper row line and the second upper column line form the second upper key switch, the first upper key switch and the second upper key switch form a first key matrix, the first lower row line and the first lower column line form the first lower key switch, the second lower row line and the three lower row lines form the second lower key switch, and the first lower key switch and the second lower key switch form a second key matrix; the arrangement mode of the first key matrix is different from that of the second key matrix.
In a preferred embodiment, the first key matrix is arranged in the same manner as the first key and the second key, and the second key matrix is arranged in a different manner from the first key and the second key.
In a preferred embodiment, the control unit includes a plurality of first predetermined key information and a plurality of second predetermined key information, the plurality of first predetermined key information corresponds to a first key matrix, and the plurality of second predetermined key information corresponds to a second key matrix; when the control unit receives the first key information and the second key information, the control unit can obtain the first preset key information corresponding to the first key from the plurality of first preset key information according to the first key information, and can obtain the second preset key information corresponding to the first key from the plurality of second preset key information according to the second key information, so that the control unit can output the key signal corresponding to the first key according to the first preset key information corresponding to the first key and the second preset key information corresponding to the first key.
In a preferred embodiment, when the control unit receives only the first key information, the control unit may obtain the first predetermined key information corresponding to the first key from the plurality of first predetermined key information according to the first key information, and determine that the corresponding second predetermined key information is absent, so that the control unit does not output the key signal corresponding to the first key; when the control unit only receives the second key information, the control unit can obtain the second preset key information corresponding to the first key from the plurality of second preset key information according to the second key information, and judge that the corresponding first preset key information is lacked, so that the control unit does not output the key signal corresponding to the first key.
In short, the membrane switch circuit of the keyboard is designed into a multi-layer structure, so that each key corresponds to an upper layer contact and a lower layer contact, and the membrane switch circuit can comprise two key matrixes, wherein the arrangement modes of the two key matrixes are different. In addition, because the ghost key is not actually pressed, the control unit of the keyboard is designed to receive the key information of the two key matrixes to generate corresponding key signals according to the characteristic that the ghost key is not actually pressed, and the key matrixes in different arrangement modes are matched to avoid the ghost key. Compared with the first method in the prior art, the keyboard of the invention does not need to arrange a large number of diodes therein, so that the cost of the keyboard with the ghost key prevention function can be reduced. Compared with the second method in the prior art, the number of the conducting circuits in the keyboard is less than that of the output circuits in the second method in the prior art, and the problem that the output circuits are difficult to configure can be solved.
Drawings
Fig. 1 is a schematic sectional side view of a conventional key structure.
Fig. 2 is a schematic view of an appearance structure of the keyboard in a preferred embodiment of the invention.
FIG. 3 is a partial sectional view of the keyboard according to the preferred embodiment of the present invention.
FIG. 4 is a partial schematic view of a first key matrix of the keyboard according to a preferred embodiment of the invention.
FIG. 5 is a partial schematic view of a second key matrix of the keyboard according to a preferred embodiment of the invention.
FIG. 6 is a block diagram of a control unit of the keyboard according to a preferred embodiment of the present invention.
Description of reference numerals:
1. 2 keyboard 10, 20 keys
11. 21 thin film switch circuit 12, 22 support plate
23 control unit 101 key cap
102 scissor type connecting element 103 elastic element
112 spacer layer of circuit board on 111
113 first button of the circuit board 201
202 second key 216 first Up Key switch
217 second upper key switch 218 first lower key switch
219 second lower key switch 1111 upper contact
1121 spacer layer opening 1131 lower contact
211 first plate 212 second plate
213 third plate 214 fourth plate
215 first preset key information of the fifth board 231
232 second preset key information 2011 first key cap
2012 first scissor link 2013 first elastic element
2021 second keycap 2022 second scissor type connecting element
2023 second elastic element 2111 first upper contact
2112 second upper contact 2121 first opening
2122 second opening 2131 first lower contact
2132 second lower contact 2133 third upper contact
2134 fourth upper contact 2141A third opening
2142A fourth opening 2151 a third lower contact
2152 fourth Down-contact M1 first Key matrix
M2 second key matrix R1 first on-line
R2 second row up line R1-1 first row down line
R2-1 second-row lower line S1 first-column upper line
S2 second upper row line S1-1 first lower row line
S3-1 second off-train line
Detailed Description
In view of the troubles caused by the prior art, the invention provides a keyboard capable of solving the problems of the prior art. First, an appearance structure of the keyboard of the present invention is described, please refer to fig. 2, which is a schematic diagram of an appearance structure of the keyboard in a preferred embodiment of the present invention. Fig. 2 shows an arrangement of a plurality of keys 20 of the keypad 2 of the present invention.
Next, an internal structure of the keyboard of the present invention is described, please refer to fig. 3, which is a partial sectional view of the keyboard according to a preferred embodiment of the present invention. The keyboard 2 of the present invention includes a plurality of keys 20, a membrane switch circuit 21, a supporting plate 22 and a control unit 23, wherein the plurality of keys 20 includes a first key 201 and a second key 202, the first key 201 and the second key 202 are exposed on the upper surface of the keyboard 2 and respectively connected to the supporting plate 22, and can be touched by a user to move relative to the supporting plate 22. The first button 201 includes a first button cap 2011, a first scissors connecting element 2012 and a first elastic element 2013. The first key cap 2011 is exposed on the upper surface of the keyboard 2 for the user to press. First scissor link 2012 is located between support plate 22 and corresponding first key cap 2011, and functions to connect support plate 22 and first key cap 2011 and allow first key cap 2011 to move up and down with respect to support plate 22. The first elastic element 2013 is located below the corresponding first key cap 2011 and passes through the corresponding first scissor-type connecting element 2012 to provide an elastic force to the first key cap 2011, so that the first key cap 2011 moves upward to be reset.
Similar to the first button 201, the second button 202 includes a second button cap 2021, a second scissor-type connecting element 2022, and a second elastic element 2023. The second keycap 2021 is exposed on the upper surface of the keyboard 2 for the user to touch. The second scissor-type connecting element 2022 is located between the supporting plate 22 and the corresponding second key cap 2021, and functions to connect the supporting plate 22 and the second key cap 2021 and move the second key cap 2021 up and down relative to the supporting plate 22. The second elastic element 2023 is located below the corresponding second key cap 2021 and passes through the corresponding second scissor-type connecting element 2022 to provide an elastic force to the second key cap 2021, so that the second key cap 2021 moves upward to be reset.
The membrane switch circuit 21 is located between the supporting board 22 and the plurality of keys 20, and functions to be pressed by the first key 201 or the second key 202 to generate a corresponding key signal. The supporting board 22 is disposed below the membrane switch circuit 21, and can carry a plurality of keys 20 and the membrane switch circuit 21 thereon. Fig. 3 shows that the supporting plate 22 has a plurality of hooks (not shown) corresponding to the keys 20, and the hooks function to connect with the corresponding first scissors connecting element 2012 or second scissors connecting element 2022 to fix the first key cap 2011 or second key cap 2021 on the supporting plate 22. The control unit 23 is connected to the membrane switch circuit 21, and functions to output a corresponding key signal according to the received key information, and the operation of the control unit will be described in detail later. In the preferred embodiment, the keyboard 2 is a keyboard for a notebook computer, the first scissors-type connecting element 2012 is a scissors-type connecting element, i.e. commonly called scissors, which swings with the movement of the first key cap 2011, and the first elastic element 2013 is a rubber elastic body, which is merely an example and not a limitation. In another preferred embodiment, the first key cap and the second key cap can also be operated by using a volcano-vent type connecting structure for a desktop computer, and in addition, the first key cap and the second key cap can be controlled to move up and down in a magnetic manner.
Referring to fig. 3 again, the membrane switch circuit 21 includes a first board 211, a second board 212, a third board 213, a fourth board 214, and a fifth board 215, wherein the first board 211 is located below the first elastic element 2013 and the second elastic element 2023 of the plurality of keys 20 and includes a first upper contact 2111 corresponding to the first key 201 and a second upper contact 2112 corresponding to the second key 202, and the first upper contact 2111 and the second upper contact 2112 are both disposed on the lower surface of the first board 211. The second plate 212 is located below the first plate 211 and includes a first opening 2121 corresponding to the first upper contact 2111 and a second opening 2122 corresponding to the second upper contact 2112, wherein the first opening 2121 and the second opening 2122 respectively penetrate through the second plate 212. The third board 213 is located below the second board 212 and includes a first lower contact 2131, a second lower contact 2132, a third upper contact 2133 and a fourth upper contact 2134, wherein the first lower contact 2131 corresponds to the first upper contact 2111 and the first opening 2121, and the second lower contact 2132 corresponds to the second upper contact 2112 and the second opening 2122. The first lower contact 2131 and the second lower contact 2132 are disposed on the upper surface of the third plate 213, and the third upper contact 2133 and the fourth upper contact 2134 are disposed on the lower surface of the third plate 213.
The fourth board 214 is located below the third board 213 and includes a third opening 2141 corresponding to the third upper contact 2133 and a fourth opening 2142 corresponding to the fourth upper contact 2134, wherein the third opening 2141 and the fourth opening 2142 respectively penetrate through the fourth board 214. The fifth board 215 is disposed below the fourth board 214 and includes a third lower contact 2151 and a fourth lower contact 2152, the third lower contact 2151 corresponds to the third upper contact 2133 and the third opening 2141, and the fourth lower contact 2152 corresponds to the fourth upper contact 2134 and the fourth opening 2142. The third lower contact 2151 and the fourth lower contact 2152 are disposed on the upper surface of the fifth board 215.
As shown in fig. 3, the first upper contact 2111, the first opening 2121 and the first lower contact 2131 form a first upper contact, the third upper contact 2133, the third opening 2141 and the third lower contact 2151 form a first lower contact, and the first upper contact and the first lower contact correspond to the first button 201. Similarly, the second upper contact 2112, the second opening 2122 and the second lower contact 2132 form a first upper contact, the fourth upper contact 2134, the fourth opening 2142 and the fourth lower contact 2152 form a second lower contact, and the first lower contact and the second lower contact both correspond to the second key 202.
It should be noted that the supporting board of the keyboard of the present invention can be disposed below the membrane switch circuit, and can also be disposed above the membrane switch circuit according to the requirement, but the supporting board must be disposed with the supporting board opening corresponding to the elastic element, so that the elastic element can pass through the supporting board opening to trigger the membrane switch circuit.
Referring to fig. 3, fig. 4 and fig. 5, fig. 4 is a partial structural schematic diagram of a first key matrix of the keyboard according to a preferred embodiment of the invention, and fig. 5 is a partial structural schematic diagram of a second key matrix of the keyboard according to a preferred embodiment of the invention. Fig. 4 shows the first key matrix M1 of the membrane switch circuit 21, and the first key matrix M1 is formed by the first upper key switch 216, the second upper key switch 217 and other upper key switches. On the other hand, fig. 5 shows the second key matrix M2 of the membrane switch circuit 21, and the second key matrix M2 is formed by the first key-down switch 218, the second key-down switch 219 and other key-down switches. As can be seen from fig. 3, 4 and 5, the first upper contact 2111 is electrically connected to the first upper key switch 216 through the first row upper line R1, and the first lower contact 2131 is electrically connected to the first upper key switch 216 through the first row upper line S1. The second upper contact 2112 is electrically connected to the second upper key switch 217 through the second column upper line R2, and the second lower contact 2132 is electrically connected to the second upper key switch 217 through the second column upper line S2. The third upper contact 2133 is electrically connected to the first lower key switch 218 through a first column lower line R1-1, the third lower contact 2151 is electrically connected to the first lower key switch 218 through a first row lower line S1-1, the fourth upper contact 2134 is electrically connected to the second lower key switch 219 through a second column lower line R2-1, and the fourth lower contact 2152 is electrically connected to the second lower key switch 219 through a third row lower line S3-1.
The first row upper line R1 and the first column upper line S1 form a first upper key switch 216, and the second row upper line R2 and the second column upper line S2 form a second upper key switch 217. The first row lower line R1-1 and the first column lower line S1-1 form the first key down switch 218, and the second row lower line R2-1 and the third column lower line S3-1 form the second key down switch 219. In addition, as shown in fig. 4, the first upper key switch 216 corresponds to the key "Q", and the second upper key switch 217 corresponds to the key "S", that is, the first key 201 is the key "Q", and the second key 202 is the key "S". Therefore, it can be seen that the arrangement of the first upper key switch 216, the second upper key switch 217 and other upper key switches in the first key matrix M1 is the same as the arrangement of the plurality of keys 20 of the keyboard 2.
On the other hand, as shown in fig. 5, the first push switch 218 corresponds to the push button "Q", and the second push switch 219 corresponds to the push button "W". However, since the first row lower trace R1-1, the first column lower trace S1-1, the second row lower trace R2-1 and the third column lower trace S3-1 in the second key matrix M2 are arranged in a different manner from the first key matrix M1, the first key matrix M1 is arranged in a different manner from the second key matrix M2.
In detail, regarding the physical structure of the keyboard 2, the first upper layer contacts and the first lower layer contacts are located below the first keys 201, and the second upper layer contacts and the second lower layer contacts are located below the second keys 202. On the other hand, in the first key matrix M1, the relative position relationship between the first upper key switch 216 and the second upper key switch 217 in the first key matrix M1 is the same as the relative position relationship between the first key 201 and the second key 202 in the plurality of keys 20 through the arrangement of the first row upper line R1, the first column upper line S1, the second row upper line R2 and the second column upper line S2. In the second key matrix M2, the relative position relationship between the first and second key switches 218 and 219 in the second key matrix M2 is different from the relative position relationship between the first and second keys 201 and 202 in the plurality of keys 20 by the arrangement of the first row lower line R1-1, the first column lower line S1-1, the second row lower line R2-1 and the third column lower line S3-1. Therefore, the arrangement of the first key matrix M1 is different from the arrangement of the second key matrix M2.
The architecture of the control unit 23 is explained next. Please refer to fig. 6, which is a block diagram illustrating a control unit of a keyboard according to a preferred embodiment of the present invention. The control unit 23 includes a plurality of first default key information 231 and a plurality of second default key information 232, wherein the plurality of first default key information 231 corresponds to the first key matrix M1, and the plurality of second default key information 232 corresponds to the second key matrix M2. The plurality of first predetermined key information 231 are, for example, "R1S 1", "R2S 2", … …, etc., wherein the first predetermined key information "R1S 1" corresponds to the first up key switch 216 of the first key 201, and the first predetermined key information "R2S 2" corresponds to the second up key switch 217 of the second key 202. The second predetermined key information 232 is, for example, "R1-1S 1-1", "R2-1S 3-1", … …, etc., wherein the second predetermined key information "R1-1S 1-1" corresponds to the first down key 218 of the first key 201, and the first predetermined key information "R2-1S 3-1" corresponds to the second down key 219 of the second key 202.
The operation of the keyboard 2 of the present invention is explained next. Referring to fig. 3 to 6, when the user presses the key "Q", the elements corresponding to the key "Q" operate to press the first upper contact and the first lower contact, such that the first upper key switch 216 corresponding to the first upper contact is activated to generate the first key information "R1S 1" corresponding to the key "Q", and the first lower key switch 218 corresponding to the first lower contact is activated to generate the second key information "R1-1S 1-1" corresponding to the key "Q". The first key information "R1S 1" is generated by the triggering of the first row upper line R1 and the first column upper line S1, and similarly, the second key information "R1-1S 1-1" is generated by the triggering of the first row lower line R1-1 and the first column lower line S1-1. On the other hand, the first key information "R1S 1" and the second key information "R1-1S 1-1" are transmitted to the control unit 23.
When the control unit 23 receives the first key information "R1S 1" and the second key information "R1-1S 1-1", the control unit 23 can obtain the first predetermined key information "R1S 1" corresponding to the first key 201 from the plurality of first predetermined key information 231 according to the first key information "R1S 1". On the other hand, the second default key information "R1-1S 1-1" corresponding to the first key 201 can be obtained from the plurality of second default key information 232 according to the second key information "R1-1S 1-1". Since the first predetermined key information "R1S 1" corresponds to the key "Q" and the second predetermined key information "R1-1S 1-1" also corresponds to the key "Q", the control unit 23 can know the pressed key "Q" according to the first predetermined key information "R1S 1" and the second predetermined key information "R1-1S 1-1", so that the control unit 23 outputs a key signal corresponding to the key "Q", so that a computer (not shown in the drawing) connected to the keyboard 2 performs an instruction corresponding to the key "Q".
When the user presses the key "W", each element corresponding to the key "W" performs the same operation as the above-described key "Q", so that the first key information "R1S 2" and the second key information "R1-1S 2-1" corresponding to the key "W" are transmitted to the control unit 23. Similarly, the control unit 23 performs the same operation as the above-described key "Q" to know the pressed key "W", so that the control unit 23 outputs a key signal corresponding to the key "W" to cause a computer connected to the keyboard 2 to perform an instruction corresponding to the key "W". The operation of the user pressing the keys "A" and "S" is similar to the operation of the key "Q", and thus is not described again.
In the first key matrix M1, when the keys "Q", "W", and "a" are all activated, the key "S" is ghost-keyed, so the first key matrix M1 transmits the first key information "R2S 2" corresponding to the key "S" to the control unit 23. On the other hand, when the keys "Q", "W", and "a" are all activated in the second key matrix M2, the second key matrix M2 does not generate ghost keys because the lines corresponding to the keys "Q", "W", and "a" in the second key matrix M2 are designed to be different from the arrangement of the first key matrix M1, and the second key information "R2-1S 3-1" corresponding to the key "S" is not transmitted to the control unit 23. In accordance with the design of the present invention, the control unit 23 is configured to receive only the first key information or the second key information and not output the key signal, and at this time, the control unit 23 determines that the second key information corresponding to the key "S" is absent and does not output the key signal corresponding to the key "S". Therefore, the keyboard 2 of the present invention can avoid ghost keys.
According to the above, the thin film switch circuit of the keyboard of the invention is designed to be a multi-layer structure, so that each key corresponds to one upper contact and one lower contact, and the thin film switch circuit can include two key matrixes therein, wherein the two key matrixes are arranged in different manners. In addition, because the ghost key is not actually pressed, the control unit of the keyboard is designed to receive the key information of the two key matrixes to generate corresponding key signals according to the characteristic that the ghost key is not actually pressed, and the key matrixes in different arrangement modes are matched to avoid the ghost key.
Compared with the first method in the prior art, the keyboard of the invention does not need to arrange a large number of diodes therein, so that the cost of the keyboard with the ghost key prevention function can be reduced. Compared with the second method in the prior art, the number of the conducting circuits in the keyboard is less than that of the output circuits in the second method in the prior art, and the problem that the output circuits are difficult to configure can be solved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the claims of the present invention, so that other equivalent changes or modifications without departing from the concept disclosed in the present invention should be included in the claims of the present disclosure.
Claims (10)
1. A keyboard, comprising:
a first key exposed outside the keyboard;
a second key exposed outside the keyboard and adjacent to the first key;
a membrane switch circuit located under the first key for being pressed by the first key, the membrane switch circuit comprising:
the first upper key switch corresponds to the first key and is used for outputting first key information corresponding to the first key when the first upper key is triggered by the first key; and
the first lower key switch corresponds to the first key and is used for outputting second key information corresponding to the first key when the first key is triggered; and
the control unit is connected with the film switch circuit and used for outputting a corresponding key signal according to the received first key information and the second key information; when the control unit receives the first key information and the second key information, the control unit outputs the key signal corresponding to the first key; and when the control unit only receives the first key information or the second key information, the control unit does not output the key signal corresponding to the first key.
2. The keyboard of claim 1, wherein the membrane switch circuit further comprises:
the second upper key switch corresponds to the second key and is used for outputting third key information corresponding to the second key when the second key is triggered; and
the second lower key switch corresponds to the second key and is used for outputting fourth key information corresponding to the second key when the second key is triggered; when the control unit receives the third key information and the fourth key information, the control unit outputs a key signal corresponding to the second key; and when the control unit only receives the third key information or the fourth key information, the control unit does not output the key signal corresponding to the second key.
3. The keyboard of claim 2, wherein the membrane switch circuit further comprises:
the first plate body is positioned below the first key and the second key and comprises a first upper connecting point and a second upper connecting point;
the second plate body is positioned below the first plate body and comprises a first opening and a second opening;
the third plate body is positioned below the second plate body and comprises a first lower contact, a second lower contact, a third upper contact and a fourth upper contact;
the fourth plate body is positioned below the third plate body and comprises a third opening and a fourth opening; and
the fifth board is located below the fourth board and includes a third lower contact and a fourth lower contact.
4. The keyboard of claim 3 wherein the first upper contact is electrically connected to the first upper key switch through a first in-line circuit, the first lower contact is electrically connected to the first upper key switch through a first upper row circuit, the second upper contact is electrically connected to the second upper key switch through a second upper line, the second lower contact is electrically connected to the second upper key switch through a second upper row circuit, the third upper contact is electrically connected to the first lower key switch through a first lower line, and the third lower contact is electrically connected to the first lower key switch through a first row lower circuit, the fourth upper contact is electrically connected to the second lower key switch through a second lower line, and the fourth lower contact is electrically connected to the second lower key switch through a third lower row line.
5. The keyboard of claim 4, wherein the first row upper line and the first column upper line form the first upper key switch, the second row upper line and the second column upper line form the second upper key switch, the first upper key switch and the second upper key switch form a first key matrix, the first row lower line and the first column lower line form the first lower key switch, the second row lower line and the third column lower line form the second lower key switch, and the first lower key switch and the second lower key switch form a second key matrix; the arrangement mode of the first key matrix is different from that of the second key matrix.
6. The keyboard of claim 5, wherein the first key matrix is arranged in a manner that is the same as the arrangement of the first keys and the second keys, and the second key matrix is arranged in a manner that is different from the arrangement of the first keys and the second keys.
7. The keyboard of claim 1, wherein the control unit comprises a plurality of first predetermined key information and a plurality of second predetermined key information, and the plurality of first predetermined key information corresponds to a first key matrix and the plurality of second predetermined key information corresponds to a second key matrix; when the control unit receives the first key information and the second key information, the control unit can obtain the first preset key information corresponding to the first key from the plurality of first preset key information according to the first key information, and can obtain the second preset key information corresponding to the first key from the plurality of second preset key information according to the second key information, so that the control unit can output the key signal corresponding to the first key according to the first preset key information corresponding to the first key and the second preset key information corresponding to the first key.
8. The keyboard of claim 7, wherein when the control unit receives only the first key information, the control unit obtains the first predetermined key information corresponding to the first key from the plurality of first predetermined key information according to the first key information, and determines that the corresponding second predetermined key information is absent, such that the control unit does not output the key signal corresponding to the first key; when the control unit only receives the second key information, the control unit can obtain the second preset key information corresponding to the first key from the plurality of second preset key information according to the second key information, and judge that the corresponding first preset key information is lacked, so that the control unit does not output the key signal corresponding to the first key.
9. The keyboard of claim 1, further comprising a support plate disposed below the membrane switch circuit; wherein, this first button includes:
a first key cap exposed outside the keyboard;
a first scissors type connecting element which is positioned between the supporting plate and the first key cap and is used for connecting the supporting plate and the first key cap and enabling the first key cap to move up and down relative to the supporting plate; and
and the first elastic element is positioned between the first key cap and the membrane switch circuit and is used for being propped by the key cap to press the membrane switch circuit so as to trigger the first upper key switch and the first lower key switch.
10. The keyboard of claim 9, wherein the second key comprises:
a second key cap exposed outside the keyboard;
the second scissors type connecting element is positioned between the supporting plate and the second key cap and is used for connecting the supporting plate and the second key cap and enabling the second key cap to move up and down relative to the supporting plate; and
and the second elastic element is positioned between the second key cap and the film switch circuit and is used for being propped by the key cap to press the film switch circuit so as to trigger a second upper key switch corresponding to the second key and a second lower key switch corresponding to the second key.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810030684.8A CN110033974B (en) | 2018-01-12 | 2018-01-12 | Keyboard with a keyboard body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810030684.8A CN110033974B (en) | 2018-01-12 | 2018-01-12 | Keyboard with a keyboard body |
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| Publication Number | Publication Date |
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| CN110033974A CN110033974A (en) | 2019-07-19 |
| CN110033974B true CN110033974B (en) | 2020-11-06 |
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| CN201810030684.8A Active CN110033974B (en) | 2018-01-12 | 2018-01-12 | Keyboard with a keyboard body |
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| CN (1) | CN110033974B (en) |
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| Publication number | Publication date |
|---|---|
| CN110033974A (en) | 2019-07-19 |
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