JP2001159948A - Batteryless cord-free mouse device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To wirelessly transmit the information of a computer mouse having cord-free constitution and to wirelessly transmit power supply for the mouse to the mouse. SOLUTION: An oscillator is constituted by unifying the cord-free mouse with a mouse pad, and the oscillation frequency of the oscillator is determined by a constant of a resonance circuit in the mouse. Part of oscillation voltage is rectified in the mouse and used for mouse power supply. The information of an encoder or a button switch in the mouse is encoded by a CPU built in the mouse. The HI/LO voltage of the code is applied to a varactor diode constituting part of the resonance circuit to frequency-modulate the oscillation frequency. The modulated wave is taken out by the mouse pad side and demodulated by a frequency discriminator built in the mouse pad and the demodulated wave is transmitted to a computer through a CPU built in the mouse pad.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer mouse, which is a kind of a pointing device for a computer, which eliminates a mouse code attached to the computer mouse to make the mouse code-free. The present invention relates to a computer mouse device that realizes two points, that is, eliminating a battery that has been conventionally required.

[0002]

2. Description of the Related Art Conventionally, a wireless mouse called a cordless mouse or a cord-free mouse in which a mouse code is excluded from a computer mouse is commercially available. However, all conventional mice of this type use batteries to electrically drive the mouse.

[0003]

SUMMARY OF THE INVENTION Recently, the Internet which has rapidly spread and CA which has been used by some experts
In D (computer aid design) and the like, it is no exaggeration to say that 90% or more of the computer operation time is mouse operation. At this time, it is clear that the wireless mouse is more convenient to use than the conventional wired mouse. However, power is required to electrically drive the mouse. In a wired mouse, there is no problem because power is sent from a computer through a cord, but in a cordless mouse, how to drive the mouse was a major problem. In conventional wireless mice, batteries have been used without exception to avoid this problem. The use of batteries seems like a simple solution, but it puts a heavy burden on the wireless mouse operator. In other words, a new battery must be purchased. That it must be attached to the mouse. The biggest drawback is that the battery runs out unexpectedly and the mouse does not operate, resulting in a problem that the work of creating a document drawing or the like is interrupted or stopped.

Further, if a mouse is used wirelessly, the cost of parts is increased, and at present, there is a distinct price difference from a wired mouse. Therefore, there was a problem that the demand would not increase even if it was found that it would be convenient to have no code.

[Means for Solving the Problems]

[0005] In the mouse device of the present invention, as will be described below, the problem is solved by a means in which a means for wirelessly obtaining a mouse drive power supply and a means for transmitting mouse information are combined.

According to the present invention, an active circuit is provided on a mouse pad on which a mouse is always operated, and an oscillator which oscillates at a high frequency by electromagnetic coupling generated between a coil on the mouse side and a coil on the mouse pad. Obtain a mouse drive power supply by converting the oscillation energy to DC.

The oscillation frequency of the oscillator is designed to be determined by the resonance frequency of a mouse coil and a resonance capacitor provided on the mouse side, and a microcomputer (hereinafter referred to as CPU) for serially coding encoder or button information in the mouse. Frequency modulation of the oscillation frequency at the output.

The frequency-modulated oscillating voltage is extracted on the mouse pad side, demodulated into a serial code using a frequency discriminator, and sent to a CPU mounted on the mouse pad.
Therefore, wireless transmission of mouse information is inevitably achieved.

Since the means for obtaining the mouse drive power supply and the means for transmitting mouse information are performed by one oscillator, the circuit is minimized and low cost is realized.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an operation mode of a mouse device according to the present invention. In a normal wired mouse, mouse pads are often used to improve the slip of the mouse body and to prevent the mouse ball from slipping,
In the method of the present invention, a similar pad-integrated operation mode is adopted. The difference from the wired mouse is that the mouse body has no mouse code, and the mouse pad used in combination with the mouse body has a code connected to the computer. Therefore, the mouse operator is freed from the troublesome operation with the code when operating the mouse. As other embodiments of the wireless mouse, there are many cases in which the mouse body and the receiving unit are separated from each other by several tens of cm or more as a separate type,
Both are no different in terms of releasing the annoyance of the code. However, there is an absolute difference between the two from the perspective of supplying power to the wireless mouse. In other words, it is not technically impossible to wirelessly transmit power source energy in the separate type, but it is hopelessly disadvantageous in terms of unnecessary radiation control. In the present invention, by using a mouse / pad integrated operation form, power can be transmitted in proximity, and as a result, the problem of unnecessary radiation has been overcome, and the object of being battery-free and cord-free has been achieved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a mouse 1
m, the mouse pad 2 used in combination with the pad pad has pad coils Lx and Ly, and a positive feedback is generated between the input and output of the active circuit 3 through the intermediary of the coupling coil Lm to form an oscillator. It is. First, this will be described with reference to the drawings. FIG. 2 shows two pad coils Lx and Ly laid on the upper surface of the mouse pad 2 as an example having no mutual inductance. The coils Lx and Ly have a configuration in which currents flowing are orthogonal to each other, so that generated magnetic fluxes are also orthogonal and have no mutual inductance. If the line spacing between adjacent coils in each coil is too small, the characteristics of a distribution constant take on. However, if the line spacing is several times or more with respect to the line width, the characteristics of the distribution constant can be ignored. The application of this coil in the present invention is a simple
It can be regarded as. In the pad coils Lx and Ly, currents in opposite directions flow in adjacent WIREs, so that electromagnetic waves radiated from each WIRE cancel each other out, and a radiation electromagnetic field far from the mouse pad (for example, 3 m) is extremely low. Become.

FIG. 3 shows the state of electromagnetic coupling when Lm coils having the same pitch are opposed to comb coils such as Lx and Ly. In this figure, a high frequency power supply Es is connected to the Lx coil as a representative example, and an induced voltage is generated in the Lm coil. However, the induced voltage Eo generated when the Lm coil is shifted in the X direction is as shown in FIG. become. This principle has been put to practical use as a precise length measuring instrument under the trade name Inductosin.

Although the above length measuring device is a one-dimensional movement,
To develop this principle into two-dimensional movement of the mouse, a further leap was needed. Because the mouse moves two-dimensionally on the mouse pad,
This is because of the rotation of. FIG. 5 shows this state. Therefore, when the Lm coil having the shape shown in FIG. 3 is attached to the mouse, the induced voltage greatly changes with the rotation of the mouse. An object of the present invention is not to measure the amount of movement of the mouse from the change in the amplitude of the induced voltage generated for each pitch when the mouse coil Lm is moved, but to control the pad coils Lx and Ly electromagnetically via the mouse coil Lm. To interfere. That is, for example, Lm receives a magnetic field generated in Ly, and an induced voltage is generated in Lm.
That is, an induced voltage is generated in Lx by the magnetic field generated.

To achieve this object, a concentric coil was proposed as Lm to be mounted on a mouse as shown in FIG. FIGS. 6 and 7 show the pattern of the voltage induced by the coil Lx when currents of opposite directions are applied to the concentric coils. However, in a concentric coil having a diameter that is an even multiple of 1 / 2P (1/2 pitch), the phases are reversed between the left half and the right half of the concentric circle, and no induced voltage is generated in the coil Lx. That is, in the figure, for example, the induced voltages at which A and a are generated are reversed. However, in a concentric circle having a diameter which is an odd multiple of 1 / 2P, the induced voltages in the right half and the left half help each other in phase. Accordingly, it can be seen that the concentric circle having the latter diameter is electromagnetically well coupled to the Lx and Ly coils. Sixth
In FIG. 7 and FIG. 7, the coupling between the concentric coils Lm and Lx coils is shown. However, it is clear that the same is true for the Lm and Ly coils. When such a concentric coil is mounted on a mouse, the induced voltage generated in the coil becomes completely independent of the rotation of the mouse.

Another idea of a mouse coil to be electromagnetically coupled with a comb-shaped coil such as Lx and Ly is as shown in FIGS. 8 and 9, as shown in FIGS. A coil was proposed in which the circles were shifted from each other by an odd number of 1 / 2P and connected by a straight line to form concentric circles. The direction of the mouse with respect to the mouse pad is most likely to be in the Y direction in FIG. 1, and therefore, it is suitable when it is desired to have the maximum degree of connection.

The induced voltage generated between the concentric mouse coil Lm and the pad coils Lx to Ly is as shown in FIG. That is, as shown in FIG. 4, there is no null point at which the coupling is completely eliminated with respect to the position of the mouse, and the change in the induced voltage due to the movement of the Lm coil is small.
The characteristic is as if modulated. This is Lx or L
This is because the null point disappears due to the concentric coil obliquely intersecting the y coil. Oscillation does not stop in response to mouse movement because there is no null point,
This is very advantageous for the purposes of the present invention.

FIG. 10 shows an example of a wiring method for flowing currents in opposite directions to the concentric coils. In this figure, the coil portion perpendicular to the X axis has strong coupling with the Lx coil parallel thereto, and the horizontal portion produces strong coupling with the Ly coil. Have been.

FIG. 12 is a circuit diagram for simulating the electromagnetic coupling between the pad coils Lx and Ly having no mutual inductance and the mouse coil Lm. Here, the degree of coupling between Lx and Lm and between Ly and Lm was set to 0.05. The operation Q of the mouse resonance circuit is about 12. Now Ly
13 and 14 are obtained by calculating a transmission characteristic from Ly to Lx when a signal source having a signal source resistance of 330Ω is connected to the Lx coil and a load of 330Ω is connected to the Lx coil. First
FIG. 2 shows the frequency characteristics of the power transfer gain, and FIG. 13 shows the phase characteristics. The power transfer characteristic is L on the mouse side.
Resonance frequency 12.8M by m coil and capacitor C1
Provides maximum gain in Hz. On the other hand, the phase characteristic has a phase difference of 180 ° at 12.98 MHz slightly higher than the resonance frequency. Transmission gain at 12.98 MHz is about -45d
Since the gain is B, if the gain of the active circuit 3 is +45 dB or more and the input / output phase difference is 180 °, the oscillator shown in FIG. 15 oscillates at a frequency dependent on the resonance frequency on the mouse side. If an active circuit having an input / output phase difference of 0 ° is used, the terminal connection of Lx or Ly may be reversed. If the phase difference of the active circuit is not exactly 0 ° or 180 °, the resonance circuit on the mouse side corrects the phase so that it is just 0 ° to 180 °.
Oscillate at a frequency that results in a phase difference of Since the phase rotation of the resonance circuit is steep near the resonance frequency, the oscillator oscillates near the resonance frequency, and the oscillation frequency is largely determined by the circuit constant of the resonance circuit of the mouse. Therefore, if a varactor diode is inserted into a part of the resonance circuit of the mouse and a signal is applied thereto, a frequency-modulated wave according to the signal can be obtained.

FIG. 16 shows the mechanical components of the present invention. The mouse pad includes a pad base 10, a magnetic sheet 16, a coil layer 14, and a surface material 15. It is convenient to use a plastic molded product for the pad base 10. A ferrite rubber sheet is optimal for the magnetic sheet 16 because a material having low high-frequency loss is suitable. As the coil layer 14, a thin double-sided printed circuit board is used, and Lx, L
The y coil is configured on both sides. The surface material 15 is Lx,
A material is used that protects the Ly coil while at the same time improving the slip on the mouse body and preventing the mouse ball from slipping. Recently, high quality materials for this purpose have been developed and used in regular mouse mats. On the bottom of the mouse, a magnetic sheet 12, a coil layer 11,
The surface protection film 13 is integrated with an adhesive and mounted.

FIG. 17 is a circuit diagram of the mouse device according to the present invention, which summarizes the whole of what has been described so far. The apparatus is roughly divided into a mouse 1 and a mouse pad 2. Although the mouse is physically located on the mouse pad, the mouse coil Lx is placed on the pad coils Lx and Ly to make the circuit easier to see.
Only m is drawn overlapping. An active circuit 3 is provided in the mouse pad 2 and its input / output ports have pad coils Lx,
Ly is connected. The oscillator is equipped with an automatic gain control circuit 4 and has a function of suppressing fluctuations in the oscillating voltage caused by a change in the degree of electromagnetic coupling with the movement of the mouse. As described above, since the pad coils Lx and Ly are arranged so as not to have mutual inductance by themselves, they cannot oscillate when the mouse is not positioned on the pad. However, when the mouse is positioned on the pad and the electromagnetic field is mediated by the coil Lm, the two are electromagnetically coupled and oscillate.

The mouse 1 is connected to an additional coil La for correcting the inductance of the coupling mouse coil Lm, a resonance capacitor Cm, a correction capacitor Ca, and a variable capacitance diode (varactor) Cv to form a resonance circuit. The resonance frequency is examined experimentally and determined to be the point with the highest energy efficiency. An appropriate tap is provided on the coupling mouse coil Lm or the additional coil La, and rectifier diodes D1 and D2 and smoothing capacitors Cr and Ck are provided.
And a DC power supply is generated from the oscillating high-frequency voltage. As the capacity of the DC power supply, a voltage of 2.5 V and a current of 2.5 mA is sufficient as estimated from the performance of the current wireless mouse. Thus, the power supply of the encoder 5 and the mouse CPU 7 can be provided with a margin. That is, it is necessary to extract 6.25 mW of energy from the oscillator. This energy is supplied from the DC power supply of the computer through high-frequency oscillation, but requires 25 mW, considering the oscillation efficiency to be 25%. However, this level of power supply is perfectly fine for computers.

The information of the encoder 5 and the button switch 6 is converted into a serial code by the mouse CPU 7. This is a logical 0, 1 signal, but electrically, the voltage h
Since the signals are i and Lo, this signal is applied to the varactor diode Cv to frequency-modulate the oscillation frequency. The capacitor Cb connected to the serial code output terminal of the mouse CPU 7 is for high frequency bypass.

The frequency-modulated high-frequency voltage is supplied to the active circuit 3
And is inputted to the frequency discriminator 8.
Here, the frequency modulation wave is demodulated and a serial code signal generated by the mouse CPU is output. This demodulated signal is supplied to the CPU 9 of the mouse pad. FIG. 17 is drawn in correspondence with the mouse signal transmission system of the PS / 2 mode which is currently most widely used.

[0024]

Since the present invention is configured as described above, it has the following effects.

An oscillator is formed by coupling an active circuit 3 equipped with a mouse pad and two coils connected to the input and output to a resonance circuit (Lm, La, Cm, Ca, Cv) provided in the mouse. Therefore, the oscillating voltage can be rectified on the mouse side to create a DC power supply.

Since the oscillation frequency of the oscillator is largely determined by the resonance circuit on the mouse side, the frequency can be modulated by applying a serial code output from the mouse CPU 7 to the varactor diode Cv.

Since the frequency-modulated wave can be extracted on the mouse pad side, wireless transmission of mouse signals is inevitably achieved.

As described above, since the generation of the DC power supply and the wireless transmission of the mouse signal can be achieved by one oscillator, the number of parts is small and the battery-less cord-free mouse device can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 shows an operation mode of a mouse device of the present invention.

FIG. 2 shows an input / output coil laid on a mouse pad.

FIG. 3 shows electromagnetic induction between comb coils.

FIG. 4 shows an electromagnetic induction voltage generated in the circuit of FIG.

FIG. 5 shows the movement of a mouse on a mouse pad.

FIG. 6 shows the relationship between electromagnetic induction of a concentric coil having a radius equal to an even multiple of 1 / 2P and a comb coil.

FIG. 7 shows a relationship between electromagnetic induction of a concentric coil having a radius which is an odd multiple of 1 / 2P and a comb coil.

FIG. 8: Four quarters having an even multiple radius of 1 / 2P
FIG. 4 is a diagram in which partial circles are shifted from each other by ＰP.

9 is a concentric coil formed by connecting the partial coils of FIG. 8 with a straight line.

FIG. 10 shows a method of connecting concentric coils.

FIG. 11 shows electromagnetic induction voltage characteristics between a comb coil and a concentric coil.

FIG. 12 is a simulation circuit diagram of a comb coil, a concentric coil, and a resonance capacitor.

FIG. 13 shows a transmission power gain characteristic of the simulation circuit diagram.

FIG. 14 shows a transmission power phase special name in a simulation circuit diagram.

FIG. 15 illustrates an oscillator using a simulation circuit diagram.

FIG. 16 is a sectional view of a mechanism of a mouse and a mouse pad.

FIG. 17 is an overall circuit diagram of a battery-less cord-free mouse device.

[Explanation of symbols]

 Reference Signs List 1 mouse 2 mouse pad 3 active circuit 4 automatic gain control circuit 5 encoder 6 button switch 7 mouse CPU 8 frequency discriminator 9 mouse pad CPU 10 mouse pad base 11 mouse coil layer 12 mouse magnetic sheet 13 mouse surface protection layer 14 mouse Pad coil layer 15 Mouse pad surface material 16 Magnetic sheet for mouse pad Lx, Ly Mouse pad comb coil Lm, La Mouse coupling coil and additional coil Cm Mouse resonance capacitor Ca Mouse additional capacitor Cv Varactor diode Cb High frequency bypass capacitor D1, D2 High frequency rectifier diode Cr, Ck Smoothing capacitor DAT Data to computer CLK to computer Vcc Power from computer Gnd Ground line Es Signal source Eo Induced voltage P Comb coil pitch

Claims (6)

[Claims] An active circuit (3) is provided in a mouse pad (2) for a computer, and pad coils (Lx) and (Ly) arranged so as to minimize mutual inductance are connected to input / output ports thereof. I do. The mouse (1) is equipped with a mouse coupling coil (Lm), an additional coil (La), and resonance capacitors (Cm, Ca, Cv). When the mouse is operated on the top of the mouse pad, the coupling coil (L
m), the pad coils (Lx, Ly) are electromagnetically coupled and oscillate, and the oscillation frequency is mainly determined by (Lm, La, Cm, Ca, Cv) in the mouse (1). Cordless mouse device equipped with a battery. 2. The oscillator according to claim 1, wherein the mouse coupling coil Lm has a concentric coil having a diameter which is an odd multiple of a half pitch of the pad coils Lx and Ly. 3. A tap is provided at an appropriate position of a mouse coil (Lm, La), and a rectification diode (D1, D2) connected to the tap rectifies an oscillation voltage to obtain a DC power supply. The battery-less cord-free mouse device according to claim 1, wherein power is supplied to an encoder (5), a microcomputer (7), and the like in the device. 4. A microcomputer (7) converts information from an encoder (5) and a mouse button (6) generated in a mouse into a serial code, and outputs the output to a varactor diode (Cv). Item 10. A battery-less cord-free mouse device, wherein the oscillator according to item 1 is frequency-modulated. 5. An automatic gain control circuit (4) for suppressing a fluctuation of an oscillation voltage of an oscillator due to a slight change in electromagnetic coupling generated when a mouse (1) moves on a mouse pad (2). The oscillator according to claim 1, further comprising: 6. A magnetic sheet (18) is provided below a coil layer of a pad coil (Lx, Ly) mounted on a mouse pad (2), and a magnetic sheet (14) is provided above a mouse coupling coil (Lm). The pad coil (L
2. The battery-less cordless mouse device according to claim 1, wherein the electromagnetic coupling between the mouse coil (Lm) and the mouse coil (Lm) is strengthened and is not affected by the material of the table on which the mouse pad (2) is placed. .