Cordless pressure-sensitivity and electromagnetic-induction system with ...

CORDLESS PRESSURE-SENSITIVITY AND ELECTROMAGNETIC-INDUCTION SYSTEM WITH SPECIFIC FREQUENCY PRODUCER AND TWO-WAY TRANSMISSION GATE CONTROL CIRCUIT

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a system with cordless pressure-sensitivity and electromagnetic-induction, and more particularly to a system with cordless pressuresensitivity and electromagnetic-induction, wherein the system can emit and receive the specific frequency.

2. Description of the Prior Art

Because a handwriting recognition system could replace the mouse, and is more suitable than the mouse to let the user input words and patterns by user's hands, improvement of the handwriting recognition system is a hot and important 20 field of current computer technology. The original intention of the handwriting recognition system is to replace the mouse. As usual, to enhance the user's convenience, a handwriting recognition system would usually replace the mouse by both wireless pen and tablet. Herein, the pen nib 25 of the wireless pen usually corresponds to the left button of the mouse. Conventional handwriting recognition systems have been developed for many years, but these products are applied to perform only one function, such as drawing or inputting a word. 30

Usually, a handwriting recognition system is a device with cordless pressure-sensitivity and electromagnetic-induction. FIG. 1 shows a circuit block diagram of a conventional cordless pressure-sensitive and electromagnetic-induction device. Conventional cordless pressure-sensitivity and 35 electromagnetic-induction device comprises: a cordless pen and a tablet. There is an oscillating circuit that consists of LC in the cordless pen. If the pen point is touched, the amount of inductance will be changed that results in the variation of oscillating frequency. The amount of inductance is increased 40 when touching the pen point and increasing pressure so the variation of oscillating frequency is also increased. Therefore, the variation of the pressure on the pen point can be detected by way of the variation of oscillating frequency. There are two switches on the sidewall of the cordless pen, 45 the emitted frequency of the cordless pen can be changed with the capacitance variation of the LC device that is produced by pushing down or setting free the switches. Furthermore, the tablet comprises a detector, a amplifier and an analog-digital converter. In the conventional tablet, there 50 is a detected loop in the center region of the tablet, with one-way antennas located on the double faces of the detected loop, wherein the one-way antennas are equidistantly arranged in order by way of using array. The main purpose of the one-way detected loop is only applied to 55 receive the electromagnetic wave that is emitted by the cordless pen. When the cordless pen emits the electromagnetic wave, the one-way antennas receive the electromagnetic wave, and then the tablet can obtain correlative information by the electromagnetic induction. However, a 60 conventional system with cordless pressure-sensitivity and electromagnetic-induction can only receive the electromagnetic wave from the peripheral apparatus thereof and detect the position of the peripheral apparatus. In accordance with the above description, a new system with cordless pressure- 65 sensitivity and electromagnetic-induction is therefore necessary, so as to strengthen and increase the functions of

the apparatus with cordless pressure-sensitivity and electromagnetic-induction.

SUMMARY OF THE INVENTION

In accordance with the present invention, a new system with cordless pressure-sensitivity and electromagneticinduction is provided that substantially overcomes the drawbacks of above mentioned problems from the conventional system.

Accordingly, it is an object of the present invention to provide a new system with cordless pressure-sensitivity and electromagnetic-induction. The present invention can apply a two-way gate control sub-circuit in the system with cordless pressure-sensitivity and electromagnetic-induction, so as to receive the electromagnetic wave from the peripheral apparatus and emit the specific electromagnetic wave to the peripheral apparatus.

Another object of the present invention is to provide a specific frequency producer. This invention can apply the specific frequency producer, so as to generate a specific frequency, and the specific frequency is transmitted via two-way antennas of the tablet to induce current and voltage in the peripheral apparatus that has a charge circuit with inductance coil. The present invention can achieve the effect of a wireless charge. Therefore, this invention corresponds to economic effect and utilization in industry.

In accordance with the present invention, a new system with cordless pressure-sensitivity and electromagneticinduction is provided. The system with cordless pressuresensitivity and electromagnetic-induction of the present invention comprises the first wireless apparatus and the second wireless apparatus. The first wireless apparatus comprises the first sub-circuit for emitting and receiving an electromagnetic wave with a specific frequency, and the second wireless apparatus comprises the second sub-circuit for emitting and receiving an electromagnetic wave with a specific frequency. The first sub-circuit comprises: an inductance coil, a rectifier that is coupled with the inductance coil and a charge sub-circuit. The second sub-circuit comprises: a control sub-circuit; a sub-circuit for generating a specific frequency that is coupled with the control sub-circuit; a two-way gate control sub-circuit that is individually coupled with the control sub-circuit and the sub-circuit for generating a specific frequency; a sub-circuit for switching the antenna that is coupled with the control sub-circuit; a two-way transmission antenna that is coupled with the sub-circuit for switching the antenna.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:

FIG. 1 shows cross-sectional views illustrative of block diagram of the conventional apparatus with cordless pressure-sensitivity and electromagnetic-induction;

FIG. 2 shows block diagram of the system with cordless pressure-sensitivity and electromagnetic-induction in accordance with the first embodiment of the present invention;

FIG. 3 shows block diagram of the circuit for generating the specific frequency in the system with cordless pressuresensitivity and electromagnetic-induction in accordance with the second embodiment of the present invention;

FIG. 4 shows block diagram of the circuit for transmitting signal of antenna in the system with cordless pressure3

sensitivity and electromagnetic-induction in accordance with the third embodiment of the present invention;

FIG. 5A shows block diagram of the circuit with two-way transmission and electromagnetic induction in the system with cordless pressure-sensitivity and electromagneticinduction in accordance with the fourth embodiment of the present invention;

FIG. 5B shows block diagram of the peripheral apparatus with wireless electromagnetic-induction that has the induced-charge circuit in accordance with the fourth embodiment of the present invention; and

FIG. 5C shows block diagram of the induced-charge circuit of the peripheral apparatus with wireless electromagnetic-induction in accordance with the fourth embodiment of the present invention.

DESCRIPTION OF THE PREFERRED
EMBODIMENT

Although specific embodiments have been illustrated and described, it will be obvious to those skilled in the art that various modifications may be made without departing from what is intended to be limited solely by the appended claims.

As illustrated in FIG. 2, in the first embodiment of the present invention, first of all, a circuit 200 with cordless pressure-sensitivity and electromagnetic-induction is provided. The circuit 200 comprises: a control sub-circuit 210, such as a micro-controller; a sub-circuit 220 for generating a specific frequency that is coupled with the control subcircuit 210, and the sub-circuit 220 for generating a specific frequency can be set to produce a frequency arrange, wherein the sub-circuit 220 for generating a specific frequency comprises a programmable frequency divider and a flip-flop device, such as a D-type flip-flop device; a two-way gate control sub-circuit 230 that is individually coupled with the control sub-circuit 210 and the sub-circuit 220 for generating a specific frequency, wherein the two-way gate control sub-circuit 230 comprises a plurality of one-way gate control switches; a sub-circuit 240 for switching the antenna that is coupled with the control sub-circuit 210, wherein the sub-circuit 240 for switching the antenna comprises an antenna address bus and a plurality of antenna switches; a two-way transmission antenna loop 250 that is coupled with the sub-circuit 240 for switching the antenna.

As illustrated in FIG. 3, in the second embodiment of the present invention, first of all, a circuit 300 for generating specific frequency in the system with cordless pressuresensitivity and electromagnetic-induction is provided. The circuit 300 for generating specific frequency comprises: a programmable frequency divider 310 that is coupled with a frequency control bus; a NAND gate 330, the output terminal 330A of the NAND gate 330 is coupled with the programmable frequency divider 310, wherein the first input terminal 330B of the NAND gate 330 is a clock enable terminal and the second input terminal 330C of the NAND gate 330 is a clock input terminal; a flip-flop device 340, such as D-type flip-flop device, that is coupled with the programmable frequency divider 310, wherein the flip-flop device 340 comprises a specific frequency enable terminal 340A and a specific frequency output terminal 340B. Avalue of 8 bits can be set by the micro-controller in the system with cordless pressure-sensitivity and electromagnetic-induction, and then the value of 8 bits is transmitted into the circuit 300 for generating specific frequency via the frequency control bus 320, wherein the arrange of specific frequency is about between (clock signal)/256 and (clock signal)/l; for example, when the clock signal is about 6 MHz, the arrange

4

of specific frequency is about between 23.4375 KHz and 6 MHz. Afterward, the first dividing process is performed by way of using the programmable frequency divider 310 to form the first specific frequency. The first specific frequency

5 is then transmitted into the flip-flop device 340 to perform the second dividing process, so as to form the second specific frequency, wherein the second dividing process of the flip-flop device 340 can be controlled by way of using the specific frequency enable terminal 340A, and the arrange

10 of specific frequency in the second dividing process is about between (clock signal)/512 and (clock signal)/2. Subsequently, the second specific frequency is outputted from the flip-flop device 340 via the specific frequency output terminal 340B.

15 As illustrated in FIG. 4, in the third embodiment of the present invention, first of all, a circuit 400 for transmitting signal of antenna in the system with cordless pressuresensitivity and electromagnetic-induction is provided. The circuit 400 for transmitting antenna signal comprises: a

20 two-way gate control sub-circuit 410, the first terminal 410A of the two-way gate control sub-circuit 410 is coupled with an amplifier of the system with cordless pressure-sensitivity and electromagnetic-induction to transmit the signal into the amplifier, the second terminal 410B of the two-way gate

25 control sub-circuit 410 is coupled with an I/O device of a micro-controller of the system with cordless pressuresensitivity and electromagnetic-induction to control transmitted direction of the two-way gate control sub-circuit 410, and the third terminal 410C of the two-way gate control

30 sub-circuit 410 is coupled with a sub-circuit for generating specific frequency of the system with cordless pressuresensitivity and electromagnetic-induction to receive a specific frequency, wherein the two-way gate control subcircuit 410 comprises a plurality of one-way gates whose

35 transmitting directions are different from each other; an switch group 420 for controlling antenna is individually coupled with the two-way gate control sub-circuit 410 and a plurality of the antennas 430, wherein the switch group 420 for controlling antenna comprises a plurality of two-way

40 transmission switches for controlling antenna, wherein each two-way transmission switch can control at least eight antennas; an antenna address bus 440 that is individually coupled with the micro-controller of the system with cordless pressure-sensitivity and electromagnetic-induction and

45 the switch group 420 for controlling antenna, whereby the micro-controller can in sequence switch on the antenna in accord with the time-sharing, and also can transmit the signal with the specific frequency to the antennas 430. As illustrated in FIG. 5A and FIG. 5B, in the fourth

50 embodiment of the present invention, first of all, an apparatus with cordless pressure-sensitivity and electromagneticinduction is provided, the apparatus with cordless pressuresensitivity and electromagnetic-induction comprises a circuit 500A with two-way transmission and electromag

55 netic induction, such as tablet, and a peripheral apparatus with wireless electromagnetic-induction that has a inducedcharge circuit 500B, such as cordless pen. The circuit 500A with two-way transmission and electromagnetic induction comprises a specific frequency generator 510, a two-way

60 gate control device 515, an antenna switch group 520 and a two-way antenna group 525. The specific frequency generator 510 is coupled with the micro-controller 505 of the apparatus with cordless pressure-sensitivity and electromagnetic-induction, and the specific frequency gen

65 erator 510 can be set so as to produce an arrange of the specific frequency. Furthermore, the two-way gate control device 515 is individually coupled with the micro-controller