Abstract:
A battery-free wireless optical mouse comprises a wireless optical mouse and a mouse pad. This invention is different from the traditional optical mouse is that it is battery-free. It has no power connector and requires no battery. The wireless optical mouse and mouse pad are installed with an electromagnetic inductance coil. The electromagnetic induction generated by the effect of two electromagnetic inductance coils on the wireless optical mouse and mouse pad emits one-way energy capacity to the electromagnetic inductance coil of the wireless optical mouse and provide the necessary power to the optical mouse. The two electromagnetic inductance coils can be adjusted to change the electromagnetic load characteristics, such as electric current load response or frequency response to obtain one-way data transmission purpose. The data are then converted into the proper computer format through the data processing of the mouse and transmitted to the computer.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     (a) Technical Field of the Invention  
         [0002]     The present invention relates generally to a battery-free, and more particularly to a wireless optical mouse that requires no battery for operation.  
         [0003]     The wireless optical mouse and mouse pad are installed with an electromagnetic inductance coil. The electromagnetic induction generated by the effect of two electromagnetic inductance coils on the wireless optical mouse and mouse pad emits one-way energy capacity to the electromagnetic inductance coil of the wireless optical mouse and provide the necessary power to the optical mouse.  
         [0004]     The power goes through the voltage protection and regulated power supply to provide power to the wireless optical mouse. The two electromagnetic inductance coils equip with one-way data transmission capability for wireless transmission. The display unit on the mouse pad displays the status of the wireless optical mouse based on the transmitted data.  
         [0005]     The two electromagnetic inductance coils can be adjusted to change the electromagnetic load characteristics, such as electric current load response or frequency response to obtain one-way data transmission purpose. The data are then converted into the proper computer format through the data processing of the mouse and transmitted to the computer.  
         [0006]     (b) Description of the Prior Art  
         [0007]     The traditional wireless mouse system is used to transmit and receive information via radio wave. Generally, a set of transmitter/receiver shall be required to meet the system requirements, of which the transmitter is linked to a wireless mouse, and the receiver is connected to a computer. The wireless mouse is battery-driven. However, given the high frequency operating conditions for external batteries, particularly to extremely high power consumption of photo sensing displacement signal generators, this will lead to higher cost for the end users in replacement of new batteries in a faster pace. Typically, more cost shall be required for the disposal of the waste, as pollution will likely arise when the batteries of wireless optical mouse are disposed.  
       SUMMARY OF THE INVENTION  
       [0008]     The primary purpose of the present invention is to provide a battery-free wireless optical mouse, which generally comprises a wireless optical mouse and a mouse pad. The wireless optical mouse is equipped with a mouse electromagnetic coil, a coupler, a circuit rectifier, a voltage stabilizer, a mouse controller, a photo sensing displacement signal generator, a circuit modulator, a roller signal generator and a keystroke and the mouse pad with a main electromagnetic coil, an oscillator, a drive, a coupler, a demodulator, a band-pass filter, a comparator, a mouse data processor, a automatic controller and an electronic switch.  
         [0009]     The electromagnet coupler of mouse electromagnetic coil obtains electric energy from main electromagnetic coil. After being rectified by the circuit rectifier and regulated by the voltage stabilizer, the electric energy can provide the power required by wireless optical mouse. When the main electromagnetic coil is coupled to the wireless optical mouse, the operating and status information shall be encoded by the mouse controller, then subjected to the modulation or load modulation by the circuit modulator and sent out by means of electromagnetic induction. The data shall be output to the mouse data processor via demodulator, band-pass filter BPF and comparator, then decoded and transmitted to the computer after being converted into the format required by the computer.  
         [0010]     The aforesaid battery-free wireless optical mouse has the following features:  
         [0011]     During operation, the wireless optical mouse transmits status information, whereby the mouse data processor can control the electromagnetic energy output by main electromagnetic coil.  
         [0012]     If the mouse data processor has not received data from wireless optical mouse after a preset time limit, preset minimum electromagnetic energy shall be used to control the output of main electromagnetic coil. For this purpose, either analog or digital output electromagnetic energy is required, of which the digital is suitable for pulse width modulation or frequency modulation or variable-frequency pulse width modulation.  
         [0013]     The mouse pad includes a display unit, i.e. LED, for the operating status of wireless optical mouse.  
         [0014]     Within the electronics of mouse pad, the oscillation frequency of oscillation circuit unit can be replaced by the output of mouse data converter. The mouse data processor is either a microprocessor incorporating computers data transmission interface or a tailor-made integrated circuit.  
         [0015]     The electronic switch is used for on/off of oscillator, with its oscillation frequency output or otherwise not output by a mouse data converter.  
         [0016]     The mouse pad includes a keystroke used for wake-up or sleep and wake-up of the mouse pad.  
         [0017]     Compatible with USB or PS2 interface for the data transmission interface of the mouse data processor, the power supply of mouse pad can be achieved from USB or PS2.  
         [0018]     Additionally, either a power socket or an external power supply is provided for the mouse pad.  
         [0019]     The automatic controller is applied to limit the max. output electromagnetic energy of main electromagnetic coil.  
         [0020]     The mouse pad and its main electromagnetic coil can be separated from the electronic unit of mouse pad.  
         [0021]     During operation, the mouse controller can transmit preset data within every preset time limit.  
         [0022]     The main electromagnetic coil is equipped with an adjustable inductor for control of the output energy of main electromagnetic coil.  
         [0023]     Also, the wireless optical mouse is equipped with a low-voltage reset unit, which is used to detect the power supply/voltage level, reset the mouse controller and photo sensing displacement signal generator. Alternatively, it firstly can reset the mouse controller, which, then, reset the photo sensing displacement signal generator. Optionally, the low-voltage reset unit can be applied to reset the mouse controller and photo sensing displacement unit as a two-section low-voltage reset unit.  
         [0024]     Besides, the wireless optical mouse is provided with an over voltage current distributor, which is used to split the over voltage current from the energy circuit.  
         [0025]     The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.  
         [0026]     Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.  
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0027]      FIG. 1  shows the schematic diagram of the components of the present invention.  
         [0028]      FIG. 2  shows the block diagram of the composition of the mouse pad in the first exemplary embodiment.  
         [0029]      FIG. 3  shows the block diagram of the wireless optical mouse in the first exemplary embodiment.  
         [0030]      FIG. 4  shows the detailed circuit diagram of  FIG. 2 .  
         [0031]      FIG. 5  shows another detailed circuit diagram of  FIG. 2 .  
         [0032]      FIG. 6  shows the detailed circuit diagram of the wireless optical mouse.  
         [0033]      FIG. 7  shows the block diagram of the composition of the mouse pad in the second exemplary embodiment.  
         [0034]      FIG. 8  shows the detailed circuit diagram of  FIG. 7 .  
         [0035]      FIG. 9  shows the detailed circuit diagram of  FIG. 7  after increasing the VCO based on  FIG. 2 .  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0036]     The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.  
         [0037]     As shown in  FIGS. 1-3 , the present invention has offered a battery-free wireless optical mouse, which generally comprises a mouse pad  1  and a wireless optical mouse  2 .  
         [0038]     In the first example (as shown in  FIG. 2 ), the mouse pad  1  is composed of a main electromagnetic coil  11 , mouse pad&#39;s electronic unit  12 , a power supply with signal line  13 , a mouse pad  14 , a display  15  and a keystroke  16 . The mouse pad&#39;s electronic unit  12  is primarily composed of an oscillator  120 , a drive  121 , a coupler  122 , a demodulator  123 , a band-pass filter  124 , a comparator  125 , a mouse data processor  126  and an electronic switch  127 . The electric energy of the mouse pads&#39; electronic unit  12  is obtained by the host computer  3  via power line of signal line  13 . As for the electromagnetic energy generated by the mouse pad  1 , the oscillator  120  will produce a preset frequency to be activated by the drive  121 . And, the electric energy of that frequency is coupled to main electromagnetic coil  11  via a coupler  122 .  
         [0039]     The wireless optical mouse  2 , which requires no power connector and battery, is primarily composed of a mouse electromagnetic coil  21 , a circuit rectifier  22 , an over voltage current distributor  23 , a voltage stabilizer  24 , a low-voltage reset unit  25 , a circuit modulator  26 , a wireless optical mouse body  27  and a coupler  28 . To obtain the electric energy required by the wireless optical mouse body  27 , the electromagnetic energy of the main electromagnetic coil  11  shall be coupled through the mouse&#39;s electromagnetic coil  21 , and then subjected to energy coupling of that oscillation frequency by coupler  28 . After being rectified by the circuit rectifier  22 , the electric energy can provide a stable power for the wireless optical mouse body  27  through over voltage current distributor  23  and voltage stabilizer  24 . As such, it is possible to form an operating mode for wireless optical mouse  2  without battery operation. In addition, the wireless optical mouse body  27  is equipped with a mouse controller  271 , a photo sensing displacement signal generator  272 , a roller signal generator  273  and a keystroke  274 .  
         [0040]     When the main electromagnetic coil  11  is coupled to the wireless optical mouse  2 , the operating and status information of the mouse shall be encoded by the mouse controller  271 , then modulated by the circuit modulator  26  and transmitted to main electromagnetic coil  11  by means of electromagnetic induction. With the help of demodulator  123 , band-pass filter (BPF)  124  and comparator  125 , the data shall be output to the mouse data processor  126 , and then transmitted to the computer after being converted into the format required by the computer. So, it is possible to form an operating mode of wireless mouse by which the wireless optical mouse  2  transfers the wireless data.  
         [0041]     As the electric energy required by the wireless optical mouse body  27  will set limits on the moving range of wireless optical mouse  2 , it is preferable to shift within the range of mouse pad  14 . A low-voltage reset unit  25  is used to detect the power supply/voltage level, reset the mouse controller  271  and photo sensing displacement signal generator  272 . Alternatively, it can firstly reset the mouse controller  271 , which is then used to reset the photo sensing displacement signal generator  272  or enable it to operate. During operation, the mouse controller  271  can transmit preset data within every preset time limit.  
         [0042]     During operation of photo sensing displacement signal generator  272 , the mouse controller  271  can transmit another data within every preset time limit. Once receiving the preset data, the mouse data processor  126  can control the display  15  showing current state to the users, and control the drive  121  to adjust the energy transmitted by main electromagnetic coil  11  for better power consumption and availability. When the host computer  3  enter a sleep state, or a user activates keystroke  16  to put the mouse into a sleep state, the mouse data processor  126  will turn off the electronic switch  127  after obtaining the aforementioned state, and then enter the energy conservation or sleep mode.  
         [0043]     Certainly, either the host computer  3  or the user can activate the keystroke  16  to waken the mouse data processor  126 , which will turn on/off the electronic switch  127  for better energy conservation and availability. To protect the mouse pad, the automatic controller  128  will set limits on the max. output electromagnetic energy of main electromagnetic coil.  
         [0044]     In case the power line (signal line  13  is not linked to host computer  3 , but to USB HUB of BUS POWER or PS2 of host computer  3 , there is a possibility of insufficient power for the mouse pad  1 . So, external power line may be provided at the power socket of mouse pad  1  to ensure the electric energy of mouse pad  1 . The main electromagnetic coil  11  of mouse pad  1  along with mouse pad  14  can be separated from mouse pad&#39;s electronic unit  12  for desirable availability.  
         [0045]     For more information of mouse pad  1  and its overall operating modes, refer to  FIG. 4  (also  FIG. 2 ). With a view to the existing oscillating circuit of mouse pad  1 , the oscillator  120  is composed of either U 2 F, U 2 E, CX 3 , CX 4 , RX 1 , RX 2 , RX 3  and Y 2 , or U 2 F, U 2 E, CX 1 , CX 2 , CX 3 , RX 1  and RX 3 . The oscillator frequency is driven by buffer U 2 D, then subjected to predrive U 2 A, U 2 B, U 2 C, DP 1 , DN 1 , RP 1 , RN 1 , RW 5 , and finally to high-current drive QP 1 , QN 1 , RP 2 , RN 2 , DPQ 1 , DPQ 2 . The above-mentioned elements constitute the drive  121 , while CL 1  and CL 2  form the coupler  122 . Then, the electric energy of that frequency shall be coupled to L 1  enameled wire to constitute the main electromagnetic coil  11  for single-way transmission of energy. To control the output energy of main electromagnetic coil, an adjustable inductor V 1  shall adjust the resonance frequency of main electromagnetic coil, meanwhile the single-way data is received through L 1 . With the demodulator  123  comprising D 2 , D 3 , C 1 , R 2 , C 2  and R 2 A, the oscillation frequency of electromagnetic induction can be filtered out. Next, C 3 , R 3 , R 4 , C 4 , C 5 , R 5 , D 5  and D 6  constitute a band-pass filter  124  in order to filter unnecessary spurious wave. As R 6 , R 8 , R 9 , R 10 , R 11 , R 12  and U 4 B constitute a comparator  125 , the output signal of band-pass filter can be compared and amplified to output the level required by a microprocessor. As firmware within U1 microprocessor and USB serial data transmission interface constitute a mouse data converter  126 , the signal can be output to the computer via the file format of mouse. Moreover, U1 microprocessor is used to control LED1 and LED2 as part of display  15 , so the users are aware of the state of battery-free wireless optical mouse. When wireless optical mouse  2  operates beyond the range of wireless optical mouse body  27 , the automatic controller  128  enables U1 microprocessor to output a DC level, and controls the pulse width output by oscillator  120  via comparator comprising U 4 A, RF 4 , RF 5 , ZD 1 , RF 6 , RF 3 , RF 1 , RF 2 , RF 7 , RF 8  and EC 5 . In this way, it can reduce the energy of drive  121  for protection and lower power consumption. When the host computer  3  enters sleep mode, download sleep/operating mode via USB serial data transmission interface, or the user can activate keystroke  16  to enter sleep and wake-up mode by pressing S1, then U1 microprocessor will be cut off. Turn offpower switch Q 1 , R 40 , R 41 , R 42  and D 1  to constitute the power switch  127  and turn it off. Then, switch on oscillating circuit, comparator  125  and automatic controller  128 . In case oscillating circuit is switched off, there is little power consumption for the drive. Meanwhile, U1 microprocessor closes the display  15 . Some necessary electronic components are included in the circuit herein.  
         [0046]     To save the fabrication cost of the circuit of mouse pad  1  shown in  FIG. 4 , an oscillator  120  may, be constituted by U 2 F, U 2 E, R 21 , R 10 , R 2  and C 17  to generate adjustable frequency as also shown in  FIG. 5  (another detailed circuit diagram of mouse pad  1 ). The oscillator frequency is predriven by buffer U 2 D, U 2 B and U 2 A, and then subjected to high-current drive Q 3 , Q 4 , R 38  and R 37 . The above-mentioned elements constitute the drive  121 . To achieve the desirable power consumption, U1 microprocessor&#39;s mouse data processor  126  is used to control the duty period output by R 12  in a manner to reduce the energy of drive  121 . In the case of sleep or wake-up modes, switch off U1 microprocessor, turn on the power switch D 1  to form electronic switch  127 , and turn if off. Then, switch on oscillating circuit while D 1  can be switched off to save the cost. In such case, there is little power consumption for the drive. The generated oscillator frequency can be directly output by U1 microprocessor and the output duty cycle can be modified to increase or reduce the energy of drive  121 , which is generally called pulse width modulation. Alternatively, the oscillator frequency can be directly output by U1 microprocessor and the output frequency can be modified. As coupler  122  is composed of C 4  and C 5  and the main electromagnetic coil  11  composed of L 1  enamelled wire, the frequency displacement can reduce the electromagnetic energy transmitted from L 1  main electromagnetic coil  11 , thus controlling the output electric energy by variable frequency, which is generally called frequency modulation. Alternatively, U1 microprocessor may be designed with pulse width modulation and frequency modulation to control the electromagnetic energy transmitted from L 1  main electromagnetic coil  11 , which is generally called variable-frequency pulse width modulation. Also, U1 microprocessor can output a DC level, with this function similar to that of a non-oscillating oscillator that constitutes a virtual electronic switch  127 . This example is more cost-efficient because both digital and tailor-made integrated circuit (ASIC) can be applied for mouse data processor  126 . For more information of the wireless optical mouse  2  and its overall operating modes, refer to  FIG. 6  (also including  FIG. 3 ). The microprocessor  271  specific to the wireless optical mouse body  27  is composed of U1 microprocessor incorporating firmware, the photo sensing displacement signal generator  272  composed of U 4 , LED 1 , Y 1  and relevant components, the roller signal generator  273  composed of IRZY, RZ 2  and relevant components, and keystroke  274  composed of SWL 1 , SWR 1 , SWM 1 , SW 1 , SW 2 , SW 3 , SW 4 , SW 5  and relevant components.  
         [0047]     The mouse electromagnetic coil  21  is made of L 2  enameled wire, which obtains electromagnetic energy from main electromagnetic coil  11 , and is subjected to energy coupling by the coupler  28  of the oscillation frequency. The electric energy is rectified by a rectifier circuit  22  composed of full-wave bridge rectifier circuit DS 1 , DS 2 , DS 3 , DS 4 . Next, through ZD 1  over voltage current distributor  23 , ZD 1  can realize the results of distributing over voltage and current. Subsequently, the power supply of wireless optical mouse body  27  is sourced from voltage stabilizer  24  of existing EC 1 , U 2 , TC 1 , CB 5  and L 3 . Meanwhile, EC 1  is also capable of storing electric energy such that it is possible to offer an operating mode for wireless optical mouse  2  without battery operation.  
         [0048]     In the event of operation of wireless optical mouse  2 , the operating and status information shall be encoded by the mouse controller  271  of U1 microprocessor, while the energy coupling or load of mouse electromagnetic coil  21  shall be modulated by C4, Q1, RB2 circuit modulator  26 . Alternatively, the SW SPDT is switched to J 3  and J 4  while the energy coupling or load shall be modulated by Vi after DS1, DS2, DS3, DS4 bridge rectification, and finally the data shall be transmitted to the mouse pad  1 .  
         [0049]     The electric energy required by wireless optical mouse  2  will set limits on the moving range of wireless optical mouse body  27 , i.e. within the range of mouse pad  14 . For this purpose, a low-voltage reset unit  25  is to detect the power supply/voltage level via existing U3 voltage probe integrated circuit, and reset U1 microprocessor, mouse microprocessor  271 . Furthermore, preset data can be transmitted by U1 microprocessor&#39;s photo sensing displacement signal generator  272 , mouse microprocessor  271 , and U1 microprocessor firmware within every preset time limit.  
         [0050]     The following is another internal block diagram of the second example (i.e.  FIG. 7 ) that shows how to optimize the power consumption of mouse pad  1  and make it more stable in data transmission. As compared to the internal block diagram of the first example, the mouse pad  1  is also equipped with voltage control oscillation frequency VCO  129  and phase comparator  130 , while oscillator  120  of the mouse pad  1  is provided with an integral frequency eliminator to control the energy output of main electromagnetic coil  11 . The frequency of oscillator  120  is several times of the resonance frequency of main electromagnetic coil  11 . The voltage control oscillation frequency VCO  129  controls the oscillation frequency through voltage, and the oscillation frequency of main electromagnetic coil  11  is obtained from integral frequency eliminator so as to control the energy output of main electromagnetic coil  11 , i.e. the mode of feedback of energy output for main electromagnetic coil (refer to  FIG. 9 ). This can be achieved jointly through electronic switch  127 , automatic controller  128  (automatic controller  128  is equipped with a unit to detect the energy of main electromagnetic coil), oscillator  120 , voltage control oscillation frequency (VCO)  129  and mouse data processor  126 . Alternatively, it can be achieved jointly through electronic switch  127 , automatic controller  128 , oscillator  120 , voltage control oscillation frequency (VCO)  129  and phase comparator  130  (refer to  FIG. 8 ), of which phase comparator  130  is used to determine the phase difference of main electromagnetic coil  11  and oscillator  120 .  
         [0051]     For more information of the mouse pad  1  and its overall operating modes in the second example, refer to  FIGS. 7 and 8 . The oscillator  120  is composed of U 2 F, CX 1  and RX 1 , and the oscillator frequency is driven by buffer U 2 E, subjected to predrive U 2 B, U 2 C, DP 1 , DN 1 , RP 1 , RN 1 , RW 5 , and finally to high-current drive QP 1 , QN 1 , RP 2 , RN 2 , DPQ 1  and DPQ 2 . The above-mentioned elements constitute the drive  121 , while CL 1  and CL 2  form the coupler  122 . The electric energy of that frequency shall be coupled to L 1  enameled wire to constitute the main electromagnetic coil  11  for single-way transmission of energy. Meanwhile, the single-way data is received through L 1  and demodulated by the demodulator  123  consisting of D 2 , D 3 , C 1 , R 2 , C 2  and R 2 A. The oscillation frequency of electromagnetic induction shall be filtered out. Next, C 3 , R 3 , R 4 , C 4 , C 5 , R 5 , D 5  and D 6  constitute a band-pass filter  124  in order to filter unnecessary spurious wave. As R 6 , R 8 , R 9 , R 10 , R 11 , R 12  and U 4 B constitute a comparator  125 , the output signal of band-pass filter can be compared and amplified to output the level required by a microprocessor. When firmware within U1 microprocessor and USB serial data transmission interface constitute a mouse data converter  126 , the signal can be output to the computer via the file format of mouse. Moreover, U1 microprocessor is used to control LED1 and LED2 as part of display  15 , so the users are aware of the state of battery-free wireless optical mouse. When wireless optical mouse  2  operates beyond the range of wireless optical mouse body  27 , the automatic controller  128  enables U1 microprocessor to output a DC level, and controls the pulse width output by oscillator  120  via a comparator composed of U 2 A, RF 4 , RF 5 , ZD 1 , RF 6 , RF 3 , RF 1 , RF 2 , RF 8  and EC 5 . In this way, it can reduce the energy of drive  121  for protection and lower power consumption. RX 3 , RX 2 , EC 6 , DC 1  and CX 2  constitute voltage control oscillation frequency (VCO)  129  while U 2 A, U 2 E, R 31 , C 23 , R 25 , D 9 , D 10 , R 26 , R 27 , C 21 , R 28 , U 2 C, R 29 , R 30 , C 22 , R 24 , R 23 , C 20 , R 22 , R 21 , U 2 D, D 7 , D 8  and R 20  form a phase comparator  130  incorporating main electromagnetic coil  11  output waveform and oscillator output waveform, so the energy output of main electromagnetic coil  11  can be controlled through the voltage generated by main electromagnetic coil  11  output waveform and the voltage-generated by the phase comparator  130  incorporating main electromagnetic coil  11  output waveform and oscillator output waveform along with voltage control oscillation frequency (VCO)  129 . When the host computer  3  enters sleep mode, download sleep/operating mode via USB serial data transmission interface, or the users can activate keystroke  16  to enter sleep and wake-up mode by pressing S1, then U1 microprocessor will be cut off. Turn on power switch Q 1 , R 40 , R 41 , R 42  and D 1  to constitute the power switch  127 , and turn it off. Then, switch on oscillating circuit, comparator  125  and automatic controller  128 . In case oscillating circuit is switched off, there is little power consumption for the drive. Meanwhile, U1 microprocessor closes the display  15 . Some necessary electronic components are included in the circuit herein.  
         [0052]     As shown in  FIG. 9 , the oscillator  120  of the mouse pad  1  is composed of U 4 D, CX 2 , RX 6 , RX 7 , RX 8  and RX 9 . The frequency eliminated by U 2 A is subjected to predrive U 2 B, DP 1 , DN 1 , RP 1 , RN 1 , RW 1 , RW 2 , RW 3 , RW 5 , and then to high-current drive QP 1 , QN 1 , RP 2 , RN 2 , DPQ 1  and DPQ 2 . The above-mentioned elements constitute the drive  121 , while CL 1  and CL 2  form the coupler  122 . The electric energy of that frequency shall be coupled to L 1  enamelled wire to constitute the main electromagnetic coil  11  for single-way transmission of energy. Meanwhile, the single-way data is received through L 1  and demodulated by the demodulator  123  composed of D 2 , D 3 , C 1 , R 2 , C 2  and R 2 A. The oscillation frequency of electromagnetic induction shall be filtered out. Next, C 3 , R 3 , R 4 , C 4 , C 5 , R 5 , D 5  and D 6  constitute a band-pass filter  124  in order to filter unnecessary spurious wave. As R 6 , R 8 , R 9 , R 10 , R 11 , R 12  and U 4 B constitute a comparator  125 , the output signal of band-pass filter can be compared and amplified to output the level required by a microprocessor. When firmware within U1 microprocessor and USB serial data transmission interface constitute a mouse data converter  126 , the signal can be output to the computer via the file format of mouse. Moreover, U1 microprocessor is used to control LED1 and LED2 as part of display  15 , so the users are aware of the state of battery-free wireless optical mouse. When wireless optical mouse  2  operates beyond the range of wireless optical mouse body  27 , the automatic controller  128  shall, via the output current of coil L 1 , control the pulse width output by oscillator  120  comprising U 4 A, RF 4 , RF 5 , RF 6 , RF 1 , RF 2 , CF 1 , RF 7 , RF 8 , EC 5 , RF 9 , RF 10 , RW 3 , Q 2 . In this way, it can reduce the energy of drive  121  for protection and lower power consumption. When S 1  of keystroke  16  is pressed, mouse data processor  126  will generate a voltage to control voltage control oscillation frequency (VCO)  129  composed of RX 1 , RX 2 , RX 3 , RX 4 , RX 5 , CX 1 , thereby helping change oscillation frequency and control the output energy of main electromagnetic coil  11 . The energy of coil within automatic controller  128  shall be detected and output, and the current output by coil L 1  is channeled to achieve the energy level of main electromagnetic coil  11  via U 4 A, RF 4 , RF 5 , RF 6 , RF 1 , RF 2 , CF 1 , RF 7 , RF 8  and EC 5 . Next, this energy level shall be output to the mouse data processor  126 , which can generate a DC voltage or pulse width modulation so as to form a DC current. Thus, it is possible to control the voltage control oscillation frequency (VCO)  129  composed of RX 1 , RX 2 , RX 3 , RX 4 , RX 5 , CX 1 , thereby helping change oscillation frequency and control the optimum energy output by main electromagnetic coil  11 . When the host computer  3  enters sleep mode, download sleep/operating mode via USB serial data transmission interface, or the users can activate the operating mode by pressing S1 keystroke  16 , then U1 microprocessor will be cut off. Turn on power switch Q 1 , R 40 , R 41 , R 42  and D 1  to constitute the power switch  127 , and turn it off. Then, switch on oscillating circuit, comparator  125  and automatic controller  128 . In case oscillating circuit is switched off, there is little power consumption for the drive. Meanwhile, U1 microprocessor closes the display  15 . Some necessary electronic components are also included in the circuit herein.  
         [0053]     It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.  
         [0054]     While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.