JP2000038092A - Portable telephone holding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a magnetic field between a portable telephone and a holding bed and to fix the telephone at the holding bed by the attraction of a magnetic force. SOLUTION: When an occupant gets in and an ignition key is operated, a DC bias source 21 is brought into an ON state. A DC bias is applied on a portable telephone or the induction coils 3a, 3b; 4a, 4b of a portable telephone of a holding bed 2 to generate a magnetic force, and by generating the attraction between induction coils, the portable telephone is fixed at the holding bed 2. This constitution, when an occupant gets in and the telephone is inserted in the holding bed, stably holds the portable telephone at the holding bed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile telephone holding device for holding a mobile telephone used in a vehicle.

[0002]

2. Description of the Related Art As a mobile telephone holding device used in a hands-free telephone system for vehicles, for example, Japanese Patent Application No. Hei 9-1997.
No. 114792, and as shown in FIG. This means that the mobile telephone 1 is easily held by the holding base 2 so that a telephone call and data communication can be performed in the vehicle, and the mobile telephone 1 and the devices in the vehicle (the reception processing circuit 9b, the receiver 8b, The transmission processing circuit 11b and the transmitter 10b) are connected by wireless communication using, for example, IrDA or mutual induction coils 3 and 4 of a magnetic field.

[0003]

However, in such a proposed mobile telephone holding device, a special fixing mechanism is required so that the mobile telephone 1 can be easily put in and out of the holding base 2. Has not adopted. For this reason, the behavior of the vehicle, for example, vertical vibrations caused by sudden braking or running on rough roads causes the telephone body to move to the inner side or bottom surface of the holding base 2 to generate a collision sound, or the mobile telephone 1 or the holding base. 2 may be damaged, and the mobile phone 1 may jump out of the holding base 2. Further, when the position of the telephone body is shifted in the holding table, the state of communication by mutual guidance may not be stabilized.

In order to solve these problems, it is conceivable to provide a jig for fixing the mobile telephone to the holding base. However, it is not easy to take the telephone in and out of the holding base, which is troublesome. There is.

The present invention has been made in view of such conventional problems, and a magnetic field is generated between a mobile telephone and a holding base, and the mobile telephone is fixed to the holding base by the attractive force of the magnetic force. It is another object of the present invention to provide a mobile telephone holding device capable of stably holding a mobile telephone on a holding base without being affected by the behavior of a vehicle, while avoiding the trouble of attaching / detaching the mobile telephone to / from the holding base.

[0006] The present invention is also intended to increase or decrease the attractive force of a magnetic force in accordance with the behavior of a vehicle, and to increase the holding force of a mobile telephone particularly when vibration is severe so that the mobile telephone can be stably held. It is an object of the present invention to provide a mobile telephone holding device capable of facilitating removal by weakening an attractive force when the mobile phone is detached from a holding table.

[0007]

A mobile telephone holding device according to the first aspect of the present invention includes a mobile telephone having an induction coil for transmitting and receiving communication signals in a non-contact manner, which is used in a hands-free telephone system for a vehicle. A holding base for holding the mobile telephone, which has an induction coil for transmitting and receiving a communication signal in a non-contact manner, which is used in the vehicle hands-free telephone system, and an induction coil or the holding base for the mobile telephone And DC bias means for applying a DC bias to the induction coil.

In the mobile telephone holding apparatus according to the first aspect of the present invention, the DC bias means generates a magnetic force by applying a DC bias to the induction coil of the mobile telephone or the holding base, thereby generating an attractive force between the mutual induction coils. Secure the mobile phone to the holder. Thus, when the occupant gets on the vehicle and inserts the mobile telephone into the holding base, the mobile telephone can be stably held on the holding base.

According to a second aspect of the present invention, in the mobile telephone holding device according to the first aspect of the present invention, further, telephone insertion detecting means for detecting that the mobile telephone has been inserted into the holding base, and an occupant getting on the vehicle. And a DC bias on / off control for turning on / off the DC bias power by detecting the insertion of the mobile telephone by the telephone insertion detecting means and / or detecting the occupant riding. Means.

In the mobile telephone holding device according to the second aspect of the present invention, when the occupant enters the vehicle, the occupant detection unit detects that the occupant has entered the vehicle, and / or detects that the mobile telephone has been inserted into the holding base. , The DC bias on / off control means turns on the DC bias power. As a result, wasteful consumption of power is prevented, and the mobile telephone can be stably held in the holding base by the magnetic force of the DC bias only when the mobile telephone needs to be held.

According to a third aspect of the present invention, there is provided a mobile telephone holding device.
A mobile telephone having a transmission induction coil for transmitting a communication signal in a non-contact manner and a reception induction coil for receiving the communication signal used in a hands-free telephone system for a vehicle, and the hands-free vehicle A transmission induction coil for transmitting a communication signal in a non-contact manner used for a telephone system, and a reception induction coil for receiving the communication signal, and a holding table for holding the mobile phone, When the mobile phone is inserted in the correct orientation, the magnetic attraction between the transmission induction coil and the reception induction coil of the mobile phone, and the transmission induction coil and the reception induction coil of the holding table, respectively. Occurs,
DC bias means for applying a DC bias current such that magnetic repulsion occurs between the two in the state of being inserted upside down, telephone insertion detection means for detecting that the mobile telephone has been inserted into the holding table, Occupant occupancy detection means for detecting that an occupant is occupying the vehicle; and power supply of the DC bias is turned on and off by detection of insertion of the mobile telephone by the telephone insertion detection means and / or detection of occupancy of the occupant. DC bias on / off control means.

In the mobile telephone holding apparatus according to the third aspect of the present invention, the telephone insertion detecting means detects that the mobile telephone has been inserted into the holding base, and / or the occupant occupancy detecting means detects that the occupant has entered the vehicle. When it is detected, the DC bias on / off control means turns on the DC bias means, and the mobile telephone is inserted between the transmission induction coil and the reception induction coil of the holding base in a state where the mobile telephone is inserted in the correct direction. A magnetic bias is generated, and a DC bias current is applied so that a magnetic repulsion is generated between the two when inserted in the opposite direction.

Thus, if the mobile telephone is inserted into the holding base in the correct direction, the mobile telephone can be fixed to the holding base by generating an attractive force between the mutual induction coils. Repulsive force is generated between the mutual induction coils, so that the user can be notified of an incorrect insertion direction.

According to a fourth aspect of the present invention, in the mobile telephone holding device of the third aspect of the present invention, there is further provided an auxiliary telephone insertion detecting means provided near an entrance of the holding base for detecting insertion of the mobile telephone. When the auxiliary telephone insertion detecting means detects the insertion of the mobile telephone into the holding table, the transmitting induction coil and the receiving induction coil of the mobile telephone, and the transmission induction coil and the receiving induction coil of the holding table. Each of the coils is provided with auxiliary DC bias applying means for applying a DC bias current so that magnetic repulsion is generated between the coils for a predetermined time.

In the mobile telephone holding apparatus of the present invention, when a part of the mobile telephone is inserted into the entrance of the holding base, the auxiliary telephone insertion detecting means detects the insertion, and the auxiliary DC bias applying means detects the mobile telephone. A DC bias current is applied to each of the transmission induction coil and the reception induction coil, and the transmission induction coil and the reception induction coil of the holder for a predetermined time so that magnetic repulsion occurs between them. Thereby, even when the mobile telephone is roughly inserted into the holding table, the shock is buffered by the magnetic repulsion generated temporarily, thereby preventing the generation of the impact sound and the damage of the equipment.

According to a fifth aspect of the present invention, there is provided the mobile telephone holding apparatus according to any one of the first to fourth aspects, further comprising a current amount of the DC bias based on a signal indicating a vehicle behavior or a signal indicating a road condition. DC bias current amount control means for controlling the DC bias current, particularly when the vehicle is vibrating violently, the DC bias current is increased accordingly to increase the attraction, and conversely, when the vehicle is stopped, the DC bias current is controlled. It can be controlled to reduce the current by reducing the current,
When necessary, the mobile telephone can be fixed to the holding table with the necessary attraction.

According to a sixth aspect of the present invention, in the mobile telephone holding apparatus according to any one of the first to fifth aspects, the DC bias means applies a DC bias synchronously to the induction coils of both the mobile telephone and the holding base. By synchronizing the polarities of the DC bias between the mobile telephone and the holding base, the attractive force or repulsive force due to the magnetic force can be increased.

[0018]

According to the first aspect of the invention, when the occupant gets on the vehicle and inserts the mobile telephone into the holding base, the mobile telephone can be stably held on the holding base.

According to the second aspect of the present invention, wasteful consumption of power is prevented, and the mobile telephone can be stably held in the holding base by the magnetic force of the DC bias only when the mobile telephone needs to be held.

According to the third aspect of the present invention, if the mobile telephone is inserted into the holding base in the correct direction, the mobile telephone can be fixed to the holding base by generating an attractive force between the mutual induction coils. If inserted in the correct orientation, a repulsive force is generated between the mutual induction coils, so that the user can be notified of an incorrect orientation.

According to the fourth aspect of the present invention, even when the mobile telephone is roughly inserted into the holding table, the shock is buffered by the magnetic repulsion generated temporarily to prevent the generation of an impact sound and the damage of the equipment. Can be prevented.

According to the fifth aspect of the present invention, the amount of the DC bias current is controlled based on the signal indicating the behavior of the vehicle or the signal indicating the road condition. In response to this, the DC bias current can be increased to increase the attractive force, and conversely, when the vehicle is stopped, the DC bias current can be reduced to reduce the attractive force. Can be fixed to the holding table. In addition, in a situation where the user must concentrate on driving, such as on a rough road, the difficulty in taking out the telephone due to the suction force may contribute to safe driving.

According to the invention of claim 6, by synchronizing the polarities of the DC bias between the mobile telephone and the holding table, the attractive force or the repulsive force due to the magnetic force can be increased.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a structure of a mobile telephone holding device according to a first embodiment of the present invention, and FIG. 2 shows a circuit configuration thereof. The mobile telephone 1 has a built-in induction coil 3a for transmitting a down signal to the holding table 2 side and an induction coil 3b for receiving an up signal from the holding table 2 side. In addition, the holding base 2 incorporates an induction coil 4a with an iron core for transmitting an up signal to the mobile phone 1 and an induction coil 4b with an iron core for receiving a down signal from the mobile phone 1.

As shown in detail in FIG. 2, the mobile telephone 1 includes a modulator 11 for modulating a signal from an intermediate frequency (IF) amplifier (not shown) which is generally used in the related art. The signal of the modulator 11 is converted into an alternating current to generate an alternating current signal.
There is provided a demodulator 13 for demodulating the current induced in b and outputting the demodulated current to the transmission mixer. This transmission mixer is also commonly used in mobile telephones.

As shown in FIG. 2, a DC bias power supply 2 for applying a DC bias to each of the transmitting induction coil 4a and the receiving induction coil 4b is provided on the holding table 2.
1 (this is variable in current), and converts a transmission signal input from a holder side transmitter 22 such as a microphone installed at an appropriate place in the vehicle via a signal processing circuit 23 into an AC signal. The AC signal generating circuit 24 converts the down signal from the mobile telephone 1 side received by the receiving induction coil 4b into an audio signal, and sends the audio signal to a holding stand side receiver 25 such as a speaker installed at an appropriate place in the vehicle. A reception signal processing circuit 26 for outputting a signal, a DC cut capacitor 27
Is provided.

The configuration of the DC bias power supply 21 will be described with reference to FIG. 3. A signal group 21-1 indicating vehicle behavior such as a vehicle speed signal and an acceleration sensor signal, which have already been converted into analog values, uses an operational amplifier. , And weighted according to the respective resistance values R1, R2, R3,...
Is input to the base current of the transistor 21-4 for controlling the amount of current of the transistor 21-4. When the output signal of the operational amplifier 21-2 is changed in a higher-order function like a logarithm, a non-linear circuit using the operational amplifier and a diode or a transistor is added between the operational amplifier 21-2 and the transistor 21-5. I do.

Next, the operation of the mobile telephone holding device having the above configuration will be described. The mobile phone 1 carried by the user is inserted from above the holding base 2 and brought into contact with the bottom of the holding base 2. For example, the DC bias power supply 21 is turned on in conjunction with an ignition key, which is a power supply of electric equipment of the vehicle, or in conjunction with an engine switch. As a result, a DC bias current flows through the transmission induction coil 4a and the reception induction coil 4b on the holding table 2 side to generate a magnetic field, and the induction coils 4a and 4b on the holding table 2 are moved to the upper end side (the mobile telephone 1). Side) is an electromagnet having an S pole or an N pole. Due to this magnetic force, the induction coil 3 on the mobile telephone 1 side
a, 3b are drawn to the induction coils 4a, 4b on the holding base 2 side, and the mobile telephone 1 itself is fixed in the holding base 2.

Here, the magnetic force (attraction) of the electromagnet is

## EQU1 ## Force F = qm.B = (I.S.n). (. Mu.0..mu.)
r · n · I). Here, qm is the magnetic charge, B is the magnetic flux density, S is the cross-sectional area of the iron core (m ² ), and μ0 is the magnetic permeability of vacuum = 4π × 10 ^−7.
(N / A ² ), μr is relative magnetic permeability, n is the number of coil turns per unit length, and I is current (A).

The magnetic flux is increased by inserting an iron core into the induction coil. And the magnetic force is 2 of the current flowing through the induction coil.
It is proportional to the power.

In this way, when the user gets into the vehicle,
When the mobile telephone 1 being carried is inserted into the holding base 2 and the ignition key is inserted into the key cylinder to perform a start operation (at least up to the accessory position), the mobile telephone 1 is inserted into the holding base 2 by the above-described constant magnetic force. 1 can be held.

Next, a description will be given of an operation in which the vehicle travels and violently vibrates on a rough road, that is, an operation of variably controlling the holding force according to the behavior of the vehicle. If the traveling speed becomes equal to or higher than a predetermined value, or if the vertical vibration increases on a bad road, the mobile phone 1 vibrates greatly in the holding base 2 or jumps out of the holding base 2. There is fear.
On the other hand, when the vehicle is stopped, or when the vehicle is running on a straight road that is wide and is not so crowded, there is a high possibility that the mobile phone 1 will be taken out of the holding table 2. It is preferable from the standpoint of operation and effective use of electric power that the mobile telephone 1 be easily taken out of the holding table 2 by doing.

Therefore, in the current variable DC bias power supply 21 shown in FIG. 3, when the traveling speed based on the speed signal exceeds a predetermined value, or when the vertical vibration becomes severe on a rough road due to the acceleration sensor signal, the transistor 21 is turned on. The current of the transistor 21-4 is increased by controlling the gate current of -5 to be larger than usual, and the DC bias current is increased to increase the magnetic force.

On the other hand, for example, the speed signal is 0,
If the vehicle is considered to be stopped due to the application of the handbrake, the navigation system or VICS
If it is considered that the vehicle is running on a straight highway with a wide road width and less congestion based on the own vehicle position detection signal, the transistor 21-4 is controlled by reducing the gate current of the transistor 21 more than usual. And the DC bias current is reduced to weaken the magnetic force.

The above-described DC bias current control operation is as shown in the flowchart of FIG. That is, the mobile telephone 1 is inserted into the holding base 2 (step S1), and when the ignition key is operated (step S2),
The DC bias power supply 21 is turned on (step S3). As a result, a predetermined magnetic force that is set in advance is generated, and the mobile phone 1 is held by the holding base 2 with a normal force.

Subsequently, the running state of the vehicle is monitored, and when the vehicle speed is equal to or higher than a predetermined value (for example, 40 km / h or more) (step S4), or when the acceleration sensor signal is equal to or higher than a predetermined value (for example, 1G or more). If (step S5), the current of the DC bias power supply 21 is increased by a predetermined value to increase the magnetic force (step S9).

Conversely, when the side brake is applied (step S6) or when the vehicle speed is 0 (step S7), the current of the DC bias power supply 21 is reduced by a predetermined value to weaken the magnetic force. The mobile phone 1 is easily taken out of the holding base 2 (step S10). Also, when the vehicle travels on an empty highway where the traveling position obtained from the navigation system or VICS is traveling (step S8), the current of the DC bias power supply 21 is reduced by a predetermined value to reduce the magnetic force. Weaken (step S10).

As described above, in the mobile telephone holding device according to the first embodiment, the signal transmitting / receiving induction coil 4 of the holding base 2 is provided.
The mobile phone 1 is fixed to the holding base 2 by the attractive force of the magnetic force by applying a DC bias current to the mobile phone 1a and 4b.
Can be stabilized. Further, since the DC bias power supply is turned on and the current is supplied while the occupant is considered to be in the vehicle, power consumption can be suppressed. In addition, when the vehicle vibrates violently or runs at high speed, the holding force is increased, and when the mobile phone is likely to be used after being detached from the holding base, the holding force is reduced.

Next, a mobile telephone holding device according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 shows a mechanical configuration of the second embodiment, and FIGS. 6 to 11 show circuit configurations. The mobile telephone holding device according to the second embodiment applies a DC bias to each of the transmitting and receiving induction coils 3a, 3b; 4a, 4b of both the mobile telephone 1 and the holding base 2, and polarizes the DC bias current ( By reversing the direction in which the current flows, the reversal force of the electromagnetic force is used so that the upstream signal and the downstream signal of the communication are prevented from being connected in reverse, and the shock when the mobile phone 1 itself is inserted is also absorbed. It is characterized as follows.

As shown in FIG. 5, the mobile telephone 1 incorporates an induction coil 3a containing a core for transmitting a down signal to the holding table 2 side and an induction coil 3b containing an iron core for receiving an up signal from the holding table 2 side. Have been. In addition, the holding base 2 incorporates an induction coil 4a with an iron core for transmitting an up signal to the mobile phone 1 and an induction coil 4b with an iron core for receiving a down signal from the mobile phone 1.

The holding table 2 is provided with a load sensor 29 for detecting the insertion of the mobile telephone 1 by its load, and emits light as means for non-contactly detecting the start of insertion of the mobile telephone 1 near the entrance. Element 30a and light receiving element 3
0b is provided. The light emitting element 30a emits light when a predetermined signal described later is input to the input terminal 201, and the light receiving element 30b
Is extracted from the terminal 202. The sensing output of the load sensor 29 is output from the terminal 203.

The output of an occupant boarding judgment circuit for judging that a vehicle occupant has boarded is given to an operation command input terminal 201 of a light emitting element 30a of an optical interrupter for detecting insertion of the mobile telephone 1 in a non-contact manner. . As shown in FIG. 6, this occupant riding determination circuit includes, for example, a signal group of an engine switch signal 31-a, an ignition key signal 31-b, a seat load sensor signal 31-c, and a seat belt attachment signal 31-d. The AND circuit 32 determines the occupant's entry based on the logical product of these signal groups, gives an operation signal to the terminal 201 as a base current, and causes the light emitting element 30a to emit light.

The microcomputer 34 shown in FIG. 7 is provided on the vehicle side. The microcomputer 34 is provided with a signal of the signal terminal 202 of the light receiving element 30b of the optical interrupter and the load sensor 29.
And a signal 37 for controlling the power supply of the load sensor 29 by a predetermined arithmetic processing, and a DC bias current for generating a repulsive force to an attractive force when the mobile telephone 1 is inserted into the holding base 2. And a power control signal 212 corresponding to a time program for controlling the power supply.

The mobile telephone 1 is provided with a downstream signal generation circuit shown in FIG. The downstream signal generation circuit modulates a signal from an intermediate frequency (IF) amplifier (not shown) generally used in a mobile telephone, converts the signal of the modulator 11 into an alternating current, An AC signal generator 12 for generating an AC signal is provided.
At the terminals 204 and 205 to the induction coil 3a for transmitting a downstream signal. Further, a DC bias power supply 213a for varying current is provided for flowing a DC bias current to the AC signal generator 12 of the downstream signal generation circuit. This DC bias power supply 21
3a variably controls the magnitude of the output current by the signal 33 '.

The mobile telephone 1 is provided with an upstream signal demodulation circuit as shown in FIG. This upstream signal demodulation circuit is connected to the terminal 20 with respect to the upstream signal receiving induction coil 3b.
6, 207, a current signal induced in the induction coil 3b is input, demodulated by the demodulator 13, and output to the transmission mixer. This transmission mixer is generally used in mobile telephones. The upstream signal demodulation circuit further includes a DC cut capacitor 28, a demodulator 36 for demodulating a DC bias control modulation signal from a modulator 35 described later and outputting control signals 33 'and 212', and a current variable. A DC bias power supply 213b is provided. This DC bias power supply 21
3b variably controls the magnitude of the output current by the signal 212 '.

The holding table 2 is provided with a downstream signal demodulation circuit as shown in FIG. The downstream signal demodulation circuit receives an induction current from terminals 208 and 209 connected to both ends of the induction coil 4b for receiving the downstream signal, converts the current into an audio signal in the reception signal processing circuit 26, and converts the current into an audio signal. This is output to the holding stand-side receiver 25. The downstream signal demodulation circuit also includes a DC cut capacitor 27 and a DC bias power supply 214 for applying a DC bias to the downstream signal receiving induction coil 4b.
b is provided. The DC bias power supply 214b variably controls the magnitude of the output current according to the output signal 212 of the microcomputer 34.

The holding table 2 is further provided with an upstream signal generation circuit as shown in FIG. The up signal generation circuit converts a transmission signal input from a stand-side transmitter 22 such as a microphone installed at an appropriate place in the vehicle via a signal processing circuit 23 into an AC signal by an AC signal generation circuit 24. And outputs the signals from the terminals 210 and 211 to the inductive coil 4a for transmitting an up signal to induce an up signal. The upstream signal generation circuit also includes a modulator 35 for wirelessly communicating the DC bias current control signals 33 and 212, and a DC bias power supply 214 for applying a DC bias to the upstream signal transmission induction coil 4a.
a is provided. The DC bias power supply 214a variably controls the magnitude of the output current according to the control signal 33.

Next, the operation of the mobile telephone holding device according to the second embodiment having the above configuration will be described with reference to the flowcharts of FIGS.

First, referring to the flowchart of FIG.
When an occupant is not present in the vehicle, the occupant enters the AND circuit (hereinafter referred to as “logical product”) 32 in the occupant occupancy determination circuit shown in FIG. 6 so that the hands-free system does not operate. Is input to the terminal 201 when all the signal groups are turned on.
A signal is output, whereby the light emitting element 30a of the optical interrupter is caused to emit light, and the power supply Vcc of the light receiving element 30b is turned on so that insertion of the mobile telephone 1 can be sensed (steps S11 and S12). Here, the signal group indicating that the occupant has boarded the vehicle includes, for example, an engine switch signal 31-a, an ignition key signal 31-b, and a load sensor signal 31-
c, the seat belt wearing signal 31-d can be used.

It is to be noted that a logical sum (OR circuit) may be used in place of the logical product 32, and the power of the optical interrupter may be turned on when only one of these signal groups is on. It is also possible to use only one or two or three of them for simplifying the system, and to turn on the optical interrupter by logical AND or logical OR. You can also. Further, in order to remove light noise from outside the vehicle, a processing function of removing noise light by subtracting (light reception signal at ON-light reception signal at OFF) by pulse emission may be added.

When the occupant gets into the vehicle, the mobile phone 1 carried by the user is inserted into the holding base 2 from above. When the mobile phone 1 is inserted, the light receiving element 30b causes an optical signal from the light emitting element 30a to enter. Can no longer be received, and FIG.
The terminal 202 as an input of the microcomputer 34 shown in FIG. Here, ON means that, for example, when the switching transistor is turned on, the driving voltage is 0.6.
V means generating a voltage higher than V, usually 5V
This means that the above voltages are applied.

The input terminal 20 of the microcomputer 34
When the ON signal is input to the second base 2 (step S13), the power of the load sensor 29 at the bottom of the holding base 2 is turned on by the control signal 37 (step S14).

Next, in order to confirm that there is nothing in the holding table 2, the output V of the output terminal 203 of the load sensor 29 =
It is determined whether it is 0 or not and the result is given to the input terminal 203 of the microcomputer 34 (step S1).
5). Here, if something is already detected in the holding table 2 and V ≠ 0, the operation by the microcomputer 34 is skipped, and if V = 0, the microcomputer 3
4 executes the time program of the DC bias current as shown in FIG. 13, which is registered in the ROM incorporated therein, and outputs the control signals 33 and 212 (step S16). Here, the control signal 33 is a control signal that varies the current + I only on the + side. This can also use the negative side. On the other hand, the control signal 212 is a control signal that causes a current of + Iv to flow immediately when V = 0, gradually reduces the current in a stepwise manner, and finally sets it to −Iv.

These DC bias current control signals 33,
Reference numeral 212 denotes an upstream signal generation circuit on the holding base 2 side (see FIG. 11).
Is transmitted to the mobile telephone 1 by the induction coil 4a or by wireless communication for the telephone, and is controlled by the demodulator 36 in the upstream signal demodulation circuit (see FIG. 9) of the mobile telephone 1. Demodulated to signals 33 ', 212'.

When receiving the control signal 33 ', the downstream signal generation circuit (mobile telephone 1 side) shown in FIG. 8 adjusts the current of the DC bias power supply 213a by the control signal 33' and connects this current to the connection terminal. The current is passed through the transmission induction coil 3a by 204 and 205, and the induction coil 3a generates a constant magnetic force by a variable DC bias current. At the same time, when receiving the control signal 212, the downstream signal demodulation circuit (on the holding table 2 side) shown in FIG. 10 changes the current of the DC bias power supply 214b by the control signal 212, and changes this variable current to the connection terminal 208, 209 allows the current to flow through the receiving induction coil 4b, and the induction coil 4b generates a variable magnetic force by a variable DC bias current.

Similarly, upon receiving the control signal 33, the upstream signal generation circuit (holding table 2 side) shown in FIG. 11 adjusts the current of the DC bias power supply 214 a by the control signal 33, and connects this current to the connection terminal 210. , 211 through the transmission induction coil 4a, and the induction coil 4a generates a constant magnetic force by a variable DC bias current. At the same time, the upstream signal demodulation circuit shown in FIG.
Side) receives the control signal 212 ′, changes the current of the DC bias power supply 213 b by the control signal 212 ′,
This variable current is passed through the receiving induction coil 3b through the connection terminals 206 and 207, and the induction coil 3b generates a variable magnetic force by a variable DC bias current.

Here, as shown in FIG.
12 and 212 ', when a variable current that changes stepwise according to a time program flows through the receiving induction coils 3b and 4b of both the mobile phone 1 and the holding base 2, the respective transmission induction coils 3a and 4a are initially generated. A repulsive force is generated between the two by repulsing the magnetic force. However, by finally reversing the direction of the current, an attractive force is finally generated between the two to function to fix the mobile telephone 1 to the holding base 2. Will do.

As a result, when the mobile telephone 1 is inserted into the holding base 2, a repulsive force is generated, which serves to reduce the impact of the mobile telephone 1 colliding with the holding base 2, and thereafter, the attractive force gradually works. Eventually, the mobile telephone 1 can be fixed to the holding base 2 in a stable state, and even if the mobile telephone 1 is roughly inserted into the holding base 2, a loud collision sound is generated or a collision impact occurs. The occurrence of breakage can be prevented.

When the mobile telephone 1 is erroneously inserted into the holding base 2 in an upside down direction, the transmitting induction coils 3a and 4a and the receiving induction coil of both the mobile telephone 1 and the holding base 2 are provided. 3b and 4b face each other, and a strong repulsive force is always generated between them so that the user's hand holding the mobile phone 1 feels repulsive force and easily recognizes a wrong orientation. Can be.

It should be noted that the control signal 212 may be set not to be on a step but to be changed so as to have a first-order decreasing function or to be set to have a higher-order decreasing function. Instead of setting the upper limit of Iv, a large current may be applied in a pulsed manner to temporarily generate a larger magnetic force.

The function characteristic of the current change can be changed according to the insertion speed of the mobile telephone 1. In this case, two or more sets of optical object detecting means are vertically arranged on the holding base 2 as the insertion detecting means of the mobile telephone 1, and based on a time difference between timings at which they detect the insertion of the mobile telephone 1. The insertion speed is calculated by using the DC bias current, and when the insertion speed is high, the DC bias current is increased so that a large repulsive force is generated. As a result, particularly when the mobile telephone 1 is inserted into the holding base 2 violently, and therefore, in a situation where a loud collision sound or damage is likely to occur, a larger shock absorbing force can be generated. .

After the execution of the time program by the microcomputer 34 described above, it is determined whether or not the mobile telephone 1 is in the holding base 2 based on the output of the load sensor 29 (step S17).
If it is within the range of 2, it is assumed that the telephone 1 is held, and the DC bias current is continuously applied (step S18).

If no occupant is detected (NO in step S11), if the optical interrupter does not detect insertion of the mobile phone 1 (N in step S13).
If the load sensor 29 detects an abnormal load or does not detect a load (branch to NO in step S17), the application of the DC bias current is stopped (step S19).

The load sensor 29 includes, for example, a piezoelectric element,
A combination of a coil and a variable resistor (Slidac) can be used. If the load detected by the load sensor 29 is within the range of the load β1 to β2 (for example, 80 g to 180 g) of the generally used mobile telephone 1, it is considered that the mobile telephone 1 is inserted. If it is lighter, it is assumed that a foreign object such as a cigarette, lighter, writing instrument, etc. has been inserted, and if it is heavier, a foreign object such as a remote control unit for a navigation system has been inserted, The useless application of the DC bias current is stopped. The mobile phone 1
In registering the weight, the weight of the mobile telephone 1 to be used is registered as a numerical value in advance, or the mobile telephone 1 is inserted into the holding base 2 in the weight registration mode and registered as a measured value of the load sensor 29. Since the load applied to the holding base 2 by the mobile telephone 1 changes depending on the posture and the running state of the vehicle, the above β1 and β2 are set as follows.

Corrected load sensor signal = load sensor signal × g
/ (G + acceleration signal) Corrected load sensor signal = load sensor signal x cos / (90 °
-Inclination angle) Here, g is a gravitational acceleration.

In addition to this correction, the influence of the attractive force due to the DC bias on the load sensor 29 can be simultaneously corrected. Conversely, in some cases, it is preferable not to correct the measurement value of the load sensor 29. In such a case,
The load sensor signal may be held for a short time, for example, 3 to 10 seconds, and a sudden change in weight may be ignored.

As described above, in the mobile telephone holding device according to the second embodiment, it is determined that the occupant is in the occupant, and when the occupant is on the occupant, the mobile telephone 1 is inserted into the holding base 2. When the mobile telephone 1 is inserted into the holding base 2, the impact of the collision is reduced, and after the mobile telephone 1 is completely inserted into the holding base 2, the repulsive force is generated by the DC bias current. It can be fixed by generating attractive force. In addition, when the mobile telephone 1 is not inserted into the holding base 2, the application of the DC bias is stopped, so that useless power consumption can be prevented.

In the mobile telephone holding device according to the second embodiment, a non-contact type such as an optical interrupter is used to detect the insertion of the mobile telephone 1 into the holding base 2 as shown in FIG. Although the detecting means is provided, the detecting means can be omitted from the configuration in order to simplify the device mechanism. In this case, the mobile phone 1 inserted into the holding base 2 is held by the magnetic force by the operation shown in the flowchart of FIG. When the occupant boarding determination circuit shown in FIG. 6 detects that the occupant has boarded, and outputs an “H” signal from the logical product 32 to the input terminal 202 of the microcomputer 34 (step S21), the microcomputer 34
Immediately turns on the power supply of the load sensor 29 through the output terminal 37 (step S22).

Next, it is detected from the output of the load sensor 29 provided at the bottom of the holding table 2 that no foreign matter has been inserted into the holding table 2 (step S23). Specifically, the output V of the load sensor 29 is zero.

If the load sensor 29 has not detected any load, the microcomputer 34 subsequently supplies a DC bias to the output terminals 33 and 212 to generate a repulsive force in order to reduce the impact when the mobile telephone 1 is inserted. A current is specified (step S24).

Thereafter, it waits for the mobile telephone 1 to be inserted for a predetermined time τ (for example, three minutes) (step S2).
5, S26), when the output of the load sensor 29 detects that the mobile telephone 1 has been inserted (step S2).
5), the microcomputer 34 is the second microcomputer shown in FIG.
A time program similar to that of the first embodiment is executed, so that the mobile phone 1 is finally fixed in the holding table 2 by the attractive force of the DC bias current (step S2).
7). The start of the time program may be performed based on whether or not the mobile phone 1 receives a downlink serial signal periodically transmitted instead of the signal from the load sensor 29.

Thereafter, similarly to the second embodiment, after the execution of the time program by the microcomputer 34, it is determined whether or not the mobile telephone 1 is in the holding table 2 based on the output of the load sensor 29 on the side (see FIG. Step S
28) If the load is within a certain range of β1 to β2, the telephone 1
Is maintained, and the DC bias current is continuously applied (step S29). When the occupant is not detected (NO in step S21), when the load sensor 29 detects the insertion of a foreign object (N in step S23).
If the mobile phone 1 is not inserted after a certain period of time (branch to YES in step S26), if the load sensor 29 detects an abnormal load or does not detect a load (NO in step S28). In the (branch), the application of the DC bias current is stopped and a standby state is set (step S30).

As described above, according to the third embodiment,
The cost can be reduced by omitting the means for detecting the insertion of the mobile telephone 1 in a non-contact manner.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the configuration of a first embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of the first embodiment.

FIG. 3 is a circuit diagram of a DC bias power supply according to the first embodiment.

FIG. 4 is a flowchart showing the operation of the first embodiment.

FIG. 5 is a sectional view showing a configuration of a second exemplary embodiment of the present invention.

FIG. 6 is a circuit diagram of an occupant entry determination circuit according to the second embodiment.

FIG. 7 is a circuit diagram of a microcomputer according to the second embodiment.

FIG. 8 is a circuit diagram of a downstream signal generation circuit according to the second embodiment.

FIG. 9 is a circuit diagram of an upstream signal demodulation circuit according to the second embodiment.

FIG. 10 is a circuit diagram of a downstream signal demodulation circuit according to the second embodiment.

FIG. 11 is a circuit diagram of an upstream signal generation circuit according to the second embodiment.

FIG. 12 is a flowchart showing the operation of the second embodiment.

FIG. 13 is a time chart showing variable control of a DC bias current in the second embodiment.

FIG. 14 is a flowchart showing the operation of the third embodiment of the present invention.

FIG. 15 is a block diagram showing a configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mobile telephone 2 Holder 3a Induction coil for transmitting downstream signal 3b Induction coil for receiving upstream signal 4a Induction coil for transmitting upstream signal 4b Induction coil for receiving downstream signal 11 Demodulator 12 AC generator 13 Demodulator 21 DC bias power supply 22 Receiver REFERENCE SIGNS LIST 23 transmission signal processing circuit 24 AC signal generator 25 transmitter 26 reception signal processing circuit 29 load sensor 30 a light emitting element 30 b light receiving element 31 signal group 32 AND circuit 33 and 33 ′ DC bias current control signal 34 microcomputer 35 modulator 36 Demodulator 213 DC bias current control signal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor ▲ Takashi Tohru 2 Nissan Motor Co., Ltd. Nissan Motor Co., Ltd. (72) Inventor Naoki 2 Takaracho 2 Kanagawa Ward, Yokohama City, Kanagawa Prefecture F term in the company (reference) 3D020 BA07 BB01 BC01 BD05 BE03 5K023 AA09 BB11 BB18 KK04 NN04 PP05 5K067 AA35 BB02 BB43 EE02 FF38 KK17

Claims (6)

[Claims] 1. A mobile telephone having an induction coil for transmitting and receiving a communication signal in a non-contact manner, which is used in a vehicle hands-free telephone system, and a non-contact communication system, which is used in the vehicle hands-free telephone system. It has an induction coil for transmitting and receiving signals, and has a holding table for holding the mobile phone, and DC bias means for applying a DC bias to the induction coil of the mobile phone or the induction coil of the holding table. Mobile phone holding device. 2. A telephone insertion detecting means for detecting that the mobile telephone is inserted into the holding base, an occupant occupancy detecting means for detecting that an occupant is in a vehicle, and the telephone insertion detecting means. 2. The mobile telephone holding device according to claim 1, further comprising: DC bias on / off control means for turning on / off the DC bias power by detecting the insertion of the mobile telephone and / or detecting the occupant getting on the vehicle. apparatus. 3. A mobile telephone having a transmitting induction coil for transmitting a communication signal in a non-contact manner and a receiving induction coil for receiving the communication signal used in a hands-free telephone system for a vehicle, It has a transmitting induction coil for transmitting a communication signal in a non-contact manner and a receiving induction coil for receiving the communication signal used in the hands-free telephone system for a vehicle, and holds the mobile telephone. In the state where the mobile phone is inserted in the correct direction, front and back to the transmitting induction coil and the receiving induction coil of the mobile phone, and to the transmission induction coil and the receiving induction coil of the holding base, respectively. DC bias means for applying a DC bias current such that a magnetic attraction is generated between the two and a magnetic repulsion is generated between the two when inserted in the opposite direction. Telephone insertion detecting means for detecting that the mobile telephone has been inserted into the holding base; occupant entry detecting means for detecting that an occupant is in the vehicle; insertion of the mobile telephone by the telephone insertion detecting means And / or DC bias on / off control means for turning on / off the power of the DC bias upon detection of the occupant and / or detection of the ride of the occupant. 4. An auxiliary telephone insertion detecting means provided near the entrance of the holding base for detecting insertion of the mobile telephone, and the auxiliary telephone insertion detecting means detects insertion of the mobile telephone into the holding base. Then, when the transmission induction coil and the reception induction coil of the mobile phone, and the transmission induction coil and the reception induction coil of the holding table, respectively, magnetic repulsion is generated between them for a predetermined time. 4. The mobile telephone holding device according to claim 3, further comprising auxiliary DC bias applying means for applying a DC bias current. 5. A DC bias current amount control means for controlling the DC bias current amount based on a signal indicating a behavior of a vehicle or a signal indicating a road condition.
The mobile telephone holding device according to any one of the above. 6. The mobile telephone holding device according to claim 1, wherein the DC bias means applies a DC bias to both induction coils of the mobile telephone and the holding base synchronously.