CN1067165C - wireless keyboard system for computer - Google Patents

Abstract

A wireless keyboard system for a computer, comprising: a keyboard transmitter for converting a user key input signal into a radio frequency signal for output; a keyboard receiver for receiving the radio frequency signal from the keyboard transmitter and generating the key data corresponding to the key input of the user to the computer. The system can convert a user-designated signal into a radio frequency signal through the keyboard transmitter and transmit the radio frequency signal to the keyboard receiver, and the keyboard receiver is connected to the computer through a cable, so that the suspension caused by the occurrence of the keyboard cable, the execution of the common function of transmitting a signal to the computer, and even the interruption of obstacles can be avoided.

Description

The wireless keyboard system of computer

The present invention is relevant in order to various specification signals are inputed to a keyboard system of computer, and particularly relevant for a kind of wireless keyboard system, it has the ability of transmitting data between keyboard and computer with wireless mode.

As shown in Figure 1, one knows computer keyboard system is connected a computer 1 with a cable 3 with a keyboard 2, by cable 3 transmission power supply service voltages (VCC), ground wire, data and time clock (clock), also just because of conventional keyboard 2 is to connect with cable 3, thereby to degree of freedom and the user's scope of activities that move the position is a kind of restriction.

For addressing this problem, the object of the present invention is to provide a kind of wireless keyboard system of computer, make between computer and keyboard mode transmit data with wireless telecommunications, wherein a key input signal is to come wireless transmission by a keypad transmitter of computer, received for giving computer by a keyboard receiver, a signal that is sent to keypad transmitter by computer with communication is handled at the keyboard receiver again.

For achieving the above object, the present invention can provide a kind of wireless keyboard system as keyboard system, and to computer, this system comprises: a keypad transmitter with the assignment key of importing a user, convert a radiofrequency signal in order to the key input signal with a user, the radiofrequency signal after will changing is again sent; And a keyboard receiver, in order to receive the radiofrequency signal of sending from keypad transmitter, produce the corresponding key data of key input signal with the user, deliver to computer again.

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, this paper is especially exemplified by a preferred embodiment, and conjunction with figs., is described in detail below:

Brief Description Of Drawings:

Fig. 1 shows the keyboard know and the annexation figure of computer;

Fig. 2 is the annexation figure that shows according to a wireless keyboard system of the present invention and a computer;

Fig. 3 is the detailed circuit diagram that shows one keypad transmitter according to the present invention; And

Fig. 4 is the detailed circuit diagram that shows the one keyboard receiver according to the present invention.

Fig. 2 shows according to the annexation figure between wireless keyboard system in one embodiment of the invention and computer.

Please refer to Fig. 2 and Fig. 3, a keypad transmitter 4 comprises: one in order to input user assignment key be converted to the amplitude shift keying signal (amplitude-shift-key-convert) of corresponding key data signal to the key array (Key matrix) of computer, with key input indication and will change after signal be modulated into the radiofrequency signal generator of a radiofrequency signal and the radio-frequency antenna of transmission radiofrequency signal.One keyboard receiver 5 is connected to a computer 1 by cable 3, in order to the data that detect radiofrequency signal with produce with respect to the data of a key signals that on the key array of keypad transmitter 4, is pressed and deliver to computer, because computer 1 is with to know computer identical, so Fig. 1 adopts identical numbering with Fig. 2.

Keyboard receiver 5 has a function, promptly can be with the self-handling signal (processes signals) of keyboard, such as: the signal (as uppercase locking Caps Lock, number lock Num Lock, scrolling locking Scroll Lock etc.) in order to the switch light emitting diode transfers to keyboard by computer 1, keyboard receiver 5 includes light emitting diode, comes the corresponding diode of switch with the signal that transfers to keyboard.Keyboard speed is to be adjusted by the key combination that defaults on the keypad transmitter 4, such as: Ctrl+ ↑ (directionkeys) or Ctrl+ ↓ (directionkeys), when such Macintosh is pressed, keyboard receiver 5 offers computer 1 after receiving signal, and in order to handle the time clock of sending signal by keypad transmitter 4, be to produce the back for giving computer 1 by keyboard receiver 5.

The structure of device shown in Figure 2 can overcome assembling during keypad transmitter 4, owing to adopt one in order to signal is sent to the radiating circuit of keypad transmitter 4 by computer 1, or an inconvenience that brings in order to the receiving circuit that receives the signal of sending out by radiating circuit.

Fig. 3 is the detailed circuit diagram of display keyboard transmitter 4, among Fig. 3, one first microprocessing unit, 7 scanning key arrays 6 are determined input, and the accompanying clock pulse signal CLK output one and the corresponding key data of key that is pressed, clock pulse signal CLK is provided to one by first splicing ear (connection jack) 8 of cable connection keyboard to computer 1, selection according to the user, can select for use first splicing ear 8 that keyboard is become to know the cable keyboard also or Wireless Keyboard, in addition, first microprocessing unit, 7 control LEDs 1, LED2 and LED3, in order to show the on off state of corresponding function, first splicing ear 8 is in order to be connected through cable first microprocessing unit 7 with computer 1, one oscillator 9 produces an oscillator signal, in order to converting radiofrequency signal to by the key data DATA output that first microprocessing unit 7 is sent, one switch 10, export the oscillator signal of switching oscillator 9 according to the key data DATA that sends by first microprocessing unit 7, and produce an amplitude shift keying modulation signal, one radio-frequency amplifier 11, in order to amplify the radiofrequency signal of sending by switch 10, one low-pass filter 12, in order to the unnecessary high frequency composition filtering in radio-frequency amplifier 11 amplifying signals, one emitting antenna 13 is in order to will enter by the radiofrequency signal radiation of low-pass filter 12 in the air.One battery 14, in order to all required power supply supply voltage VCC of operation of keypad transmitter 4 to be provided, it is connected to a power switch 15, the former switch 15 of electricity is in order to the power supply supply of switch from a battery 14 and a charging end 16, charging end 16 is in order to charge to battery 14, whether one detecting device 17 reduces to minimum, the testing result of 4 demonstration detecting devices 17 of a LED in order to monitoring by the voltage potential and the detection voltage potential of battery 14 outputs.

Switch 10 comprises: a first transistor Q1, be that key data DATA by first microprocessing unit 7 exports and controls conducting and end, one transistor seconds Q2, be to control conducting and end by the first transistor Q1, and a shorts inductor L, biasing resistor R1 and R2 and coupling condenser C1 and C2.

The operation of the wireless transmit of the keypad transmitter 4 that is formed by said structure is as follows: after power switch 15 is opened, the supply voltage VCC of the output of battery 14 provides to each circuit, after the user presses arbitrary key by key array 6, first microprocessing unit 7 is the key signals that is pressed of identification just, then by key data DATA end output one corresponding to by the key of identification key to switch 10.When being high level as key data DATA, just then transistor Q1 and Q2 conducting, so two terminal shortcircuits of inductor L, this moment, oscillator 9 was not worked, and did not also produce radiofrequency signal simultaneously; As key data DATA is low level, then transistor Q1 and Q2 end, therefore, inductor L can short circuit, so, oscillator 9 is load with inductor L, producing the radiofrequency signal of a set frequency, is continuously under the situation of modulation, to produce amplitude shift keying (amplitude-shift-key-Converted) radio-frequency (RF) pulse signal with respect to key data signal DATA according to the current potential of key data DATA in the operation of oscillator 9, then, the radiofrequency signal that is produced is emitted to through antenna 13 in the air.And be under the situation of wireless system in the keypad transmitter 4 of Fig. 3, clock pulse signal CLK is used to handle the key data signal of desiring to be transmitted, and it is produced by keyboard receiver 5.

When linking to each other with cable 3 by first splicing ear 8 with keypad transmitter 4 as first microprocessing unit 7, the then transmission of keypad transmitter 4 operation as following: clock pulse signal CLK and the key data signal DATA that is exported by first microprocessing unit 7 transfer to computer 1 via cable 3; Provide to the data of keypad transmitter 4 by computer 1, after 7 processing of first microprocessing unit and identification, control the switch of corresponding diode, first LED 1 is in order to show Caps Lock herein, second light emitting diode is Num Lock, and the 3rd LED 3 are Scroll Lock, these LEDs 1, LED2, LED3 are decided by the current potential of sending from first microprocessing unit 7.When low level, led lighting, when high level, diode is not luminous, and when wireless delivery status, do not come switch LED 1, LED2 and LED3 because keyboard receiver 5 receives the control signal of computer 1, thus first microprocessing unit 7 can driven for emitting lights diode (LED) 1, LED2 and LED3.

On the other hand, detecting device 17 is compared with the sparking voltage of battery 14 with a set reference voltage, if detecting a voltage is lower than reference voltage, it is bright then to drive the 4th LED 4, has been in the state of over-discharge can to inform user's battery 14.

Fig. 4 is the keyboard receiver that shows according to wireless keyboard system of the present invention, among Fig. 4, radio frequency receiver 40 receives the radiofrequency signal of being sent by keypad transmitter 4, deliver to a detecting device 28 then, detecting device 28 is reduced into key data with a signal by the output of second intermediate frequency amplifier 27, one wave shaping unit (waveform shaping unit), 29 output signals with detecting device 28 are shaped to one and output signal to second microprocessing unit 30, one second splicing ear 31 is in order to be connected to second microprocessing unit 30, LED 5 with computer and keyboard with cable, LED6 and LED7 are respectively through impact damper 32,33 and 34 are connected on second microprocessing unit 30.

The 5th LED 5 is in order to show Caps Lock, the 6th LED 6 is Num Lock, and the 7th LED 7 are Scroll Lock, in radio frequency receiver 40, one receiving antenna 18, in order to receive radiofrequency signal by keypad transmitter 4 emissions, one radio-frequency amplifier 19, in order to amplify received signal, export one first frequency mixer 20 again to and carry out the intermediate frequency conversion, first frequency mixer 20 is done mixing with the output signal and radio-frequency amplifier 19 output signals of one first local oscillator 21, after delivering to 22 processing of one first intermediate frequency amplifier again, deliver to one second frequency mixer 24 through one first low-pass filter 23, second frequency mixer 24 is done mixing with the output signal of low-pass filter 23 and the output signal of one second local oscillator 25, deliver to one second low-pass filter 26 again, the signal after second intermediate frequency amplifier 27 amplifies is sent to detecting device 28 again.

Label LED8 representative is for the light emitting diode of display power supply, and R6～R9 is a resistance, and VCC is a power supply supply voltage.

The function mode of the keyboard receiver 5 that is formed by said structure is as follows: the radiofrequency signal that radio frequency receiver 40 receives by keypad transmitter 4 emissions, change through intermediate frequency, after amplification and the filtering, provide executable signal to detecting device 28, detecting device 28 detects second intermediate-freuqncy signal of input with a diode detector, wave shaping unit 29 gives wave shaping with detected signal and handles, produce corresponding pulsating wave and export second microprocessing unit 30 to, second microprocessing unit 30 is distinguished in view of the above and is decided the signal that keypad transmitter 4 is pressed, after converting corresponding key data signal DATA again to, signal after will changing via cable splicing ear 31 is delivered to computer 1 and is handled, second microprocessing unit 30 produces a time clock signal CLK in order to handle key data signal DATA, this time clock CLK is identical with the clock pulse signal of first microprocessing unit, 7 outputs of keypad transmitter 4, and delivers to computer 1 through cable splicing ear 31.

Second microprocessing unit 30 receives computers 1 through cable splicing ear 31 signal to keyboard system is provided, such as: relevant for Caps Lock, data such as Num Lock, Scroll Lock, via impact damper 32,33 and 34 to LED 5, LED6 and LED7 to show corresponding state, therefore, when keypad transmitter 4 and keyboard receiver 5 were wireless keyboard system, the user can see in keyboard receiver 5 ruuning situation with LED 5, LED6 and the corresponding function of LED7.

In sum, the present invention can be sent to the keyboard receiver that is connected with cable with computer with user's specification signal with a radiofrequency signal by keypad transmitter, so can avoid by keyboard cable, carry out the general utility functions and the termination that take place when obstacle interrupt caused of transmission one signal to computer.

Though the present invention discloses as above with a preferred embodiment; but it is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; a little change and retouching of Ying Kezuo, so protection scope of the present invention should be limited by accompanying Claim.

Claims (4)

1. A wireless keyboard system for inputting a user-specified key to a computer, comprising: a keyboard transmitter for converting a user key input signal into a radio frequency signal and outputting the radio frequency signal; and a keyboard receiver, used to receive the radio frequency signal from the keyboard transmitter, generate key data corresponding to the user key input, and provide the key data to the computer, The keyboard receiver includes: a radio frequency receiver for receiving, intermediate frequency converting and amplifying said radio frequency signal; and A second data generator, used to detect the key data signal from the output signal of the radio frequency receiver, and then provide it to the computer, The second data generator includes: a detector for detecting the output signal from the radio frequency receiver; A second micro-processing unit for converting the output signal of the detector into a computer data processing form, and processing the signal provided by the computer, and controlling each unit constituting the keyboard receiver; and A connecting terminal is used for transmitting the output signal of the second micro-processing unit to the computer. 2. In the wireless keyboard system according to claim 1, said keyboard transmitter comprises: A first data generator, used for generating a key data signal to correspond to user key input; a radio frequency signal generator for receiving said key data signal and generating said radio frequency signal; and A transmitting antenna is used to transmit the radio frequency signal. 3. In the wireless keyboard system as claimed in claim 2, said first data generator comprises: One-key array for inputting user key input signals; a first micro-processing unit for identifying a user-designated key input through the key array as the key data signal; and A switch is used to control whether to generate the radio frequency signal corresponding to the key data signal output from the first micro-processing unit. 4. In the wireless keyboard system as claimed in claim 1, further comprising a first LED for displaying a Caps Lock state, a second LED for displaying a NumLock state, and a third LED for displaying The state of Soroll Lock corresponds to the signal sent by the computer respectively.

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