JPH08106985A - Power control device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a device with low power consumption by switching the power supplied to a load such as lighting depending on the distance to an object. A distance measuring means 1 for measuring a distance to an object, and a signal generating means for outputting a signal for increasing / decreasing an electric power supplied to a load LD based on distance data measured by the distance measuring means 1. 2 and a load L according to the signal of the signal generating means 2.
Power switching means 3 for switching the power supplied to D is provided. The signal generating means outputs a signal that increases the supplied power when the distance data is short distance data and decreases the supplied power when the distance data is long distance data, or increases the supplied power when the distance data is short distance data. When the distance data is a long distance data, a signal for reducing the power supply is output, or when the distance data is a data closer to a predetermined value on the near side or a data farther than a predetermined value on the far side. It is configured to output a signal that does not change the supplied power.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power control device capable of measuring the distance to an object and increasing or decreasing the brightness of a lighting fixture or the wind force of a fan according to the distance result.

[0002]

2. Description of the Related Art Conventionally, there is a so-called energy-saving lighting device that detects the approach of a human body by a pyroelectric infrared sensor or the like to turn on the lighting for a certain period of time in order to reduce power consumption. That is, such a device is installed in a corridor of a hotel or the like at a predetermined distance, and lights in front of people passing through are sequentially turned on,
After a lapse of a predetermined time, the lights are sequentially turned off.

In some fans, the magnitude of the wind power is manually switched, and the strength is automatically adjusted.

[0004]

For example, the above-mentioned conventional energy-saving lighting device does not turn on the lighting when there is no person, so that it may be in the dark, which gives a pedestrian a feeling of anxiety. It was necessary to turn on bright night lights.
In addition, since the brightness of the lighting device is constant, in the case of dark lighting, it is necessary to shorten the installation interval of the lighting device, which requires installation costs. Also, if bright lighting is used in order to increase the installation interval of the lighting devices and reduce the number of installations, the distance range covered by one lighting device becomes long, and therefore the bright lighting is turned on for a long time, resulting in power consumption. It was great.

Further, since the light is not turned off until a certain time has passed after the human body is detected, the light remains on even if there is no person, and wasteful power is consumed.

Similarly, in the case of an electric fan, the set wind power does not change whether or not there is a person, so that electric power is often wasted.

Further, since the conventional device merely detects the presence or absence of a human body and turns the load on and off, it is often unable to cope with diversified uses.

An object of the present invention is to solve the above problems and to provide a power control device capable of manufacturing a device such as a lighting device and a fan that consumes less power, and can be applied to various uses. To provide a simple power control device.

[0009]

In order to achieve the above object, the present invention provides a distance measuring means for measuring a distance to an object,
Signal generating means for outputting a signal for increasing / decreasing the power supplied to the load based on the distance data measured by the distance measuring means, and power for switching the power supplied to the load according to the signal from the signal generating means. A switching means is provided.

Depending on the application of the product used, the signal generating means outputs a signal to decrease the power supply when the distance data is a short distance data and to increase the power supply when the distance data is a long distance data. When the distance data is a short distance data, it outputs a signal that increases the supply power, and when the distance data is a long distance data, it outputs a signal that reduces the supply power, or when the distance data is closer than a predetermined value on the short distance side. It can be configured to output a signal that does not change the supplied power when the data is on the side farther than the predetermined value on the side or the far side.

Further, the distance measuring device is provided with a judging means for judging to which one of a plurality of distance areas the distance measuring result of the distance measuring means belongs within the distance measuring range of the distance measuring means. In the above, there is provided power switching means for switching the power supplied to the load according to the result of the determination means.

[0012]

The details of the present invention will be described below with reference to the embodiments shown in the accompanying drawings. FIG. 1 is a circuit block diagram showing the configuration of the first embodiment of the present invention. FIG. 1 shows a case where the brightness of the illumination means LD connected to the AC power source PW is controlled.

In FIG. 1, reference numeral 1 is a distance measuring means for measuring the distance to the object T. For example, infrared rays are emitted to detect the reflected light from the object T by a position detecting element (PSD) or the like. It is possible to use a device that uses ultrasonic waves or a device that uses ultrasonic waves. Reference numeral 2 is a signal generator which outputs a signal for increasing or decreasing the power to the load LD such as the illumination means based on the distance measurement result of the distance measurement means 1. Normally, n (integer) output signals S1, S2, ... Si.
If Sn has (i is an integer between 1 and n) and the distance measurement result of the distance measuring means 1 is within a predetermined distance region, the level of the output signal corresponding to the distance measuring region is set to a high potential (hereinafter referred to as “high potential” "H" level). In FIG. 1, a circuit relating to the output signal Si is omitted for simplicity.

Reference numeral 3 is a power switching means for switching the power supplied to the load LD according to the output signal of the signal generator 2, and includes resistors R0, RB1 to RBn, R1 to Rn, RA ,.
Transistors TR1 to TRn, diodes D1 to Dn,
Relay coils RL1 to RLn, relay segments SW1 to SW
n, capacitors C1 and C2, a trigger element DC such as a diac, and a triac TC. A portion of the power switching means 3 excluding a portion 3a surrounded by a dotted line is a power control circuit which is well known in the related art.
By delaying the conduction time of the diac DC by the resistance value between the 1 point and the P2 point (this is called the control resistance R) and the capacitor C1, the conduction time of the triac TC is changed to increase or decrease the power applied to the load. . When the value of the control resistor R is large, the power supplied to the load LD becomes small,
When the value of the control resistor R is small, the power supplied to the load LD becomes large. The resistor RA and the capacitor C2 are for reducing a so-called hysteresis phenomenon that the conduction time of the triac TC changes when the value of the control resistor R is changed from a large value to a small value and when it is changed from a small value to a large value. It is a thing. The resistors RB1 to RBn are resistors for limiting the base current of the transistors, and the diodes D1 to D
n is a spike killer diode for transistor protection.

Reference numeral 4 is a mode setting means for determining what kind of output form the output of the signal generating means 2 is, and a rotary switch or a digital switch is used. Reference numeral 5 is a terminal setting means for setting the range of the output terminals used by the signal generating means 2. The terminal setting means 5 is composed of digital switches 5a and 5b for setting both ends of the output terminals S1 to Sn. Since the power control means 3 is controlled by the output signal of the signal generating means 2, the terminal setting means may be considered as means for setting the range of the power supplied to the load LD.

In FIG. 1, the resistance R0 is set to a sufficiently large resistance value so that the illumination is at a brightness at which an object can be seen at the minimum, and the resistance R1 is set to a sufficiently small resistance value so that the illumination is at the maximum brightness. Has been done. Further, the resistors R1 to Rn are set so that the resistance values thereof gradually increase. Further, when any one of the relay sections is closed, the resistance connected to that section is connected in parallel to the resistance R0 and becomes the control resistance R.
When the resistance RO and the resistance Rn are connected in parallel, the resistance RCn
Call. Further, the brightness of the illumination when the control resistor R is the resistor RCn is Ln. For example, the brightness when the control resistance is RC2 is L2.

Next, the operation will be described with reference to FIG. Now, normally, the minimum brightness is secured, and the distance measuring means 1
Consider a lighting device that brightens the illumination when the distance measurement result is a long distance and darkens the illumination to a predetermined value when the distance measurement result is a short distance. This is shown in Figure 2 when installed in a hotel corridor, for example.
As shown in (c), the brightness [L] of the illumination LD is set to a brightness Lmin at which a minimum object can be seen when a person is not present or when the person is separated by a predetermined distance or more. When a predetermined distance Df (Fig. 2 (d)) is reached, the illumination is set to the maximum brightness Lmax (L1) so that the place where the person is located becomes bright even if it is away from the lighting device, and thereafter the person approaches. Along with this, the brightness of the illumination LD is gradually decreased, and when a person approaches a predetermined distance Dn (FIG. 2 (d)) on the near side, the brightness Li is adjusted to an appropriate level. Such control can be obtained by setting the mode setting means 4 to M1, for example.

When the mode setting means 4 is set to M1, the output of the signal generating means 2 becomes a mode in which S1 to Si are used, and the signal generating means 2 sets a predetermined distance Df on the far side and a predetermined distance Dn on the near side. Then, the distance between Df and Dn is set as (i-1) distance ranges according to a predetermined rule (for example, equal intervals). When the distance measurement result of the distance measuring means 1 does not detect the human body or the distance to the human body is equal to or more than the predetermined distance Df on the long distance side, all output signals are set to "L" level and the distance measuring means 1 measures the distance. Distance result becomes short distance (that is, distance to human body becomes short)
Along with this, the output signals S1, S2, ... Si are sequentially output so as to have a high potential (FIG. 2 (a)).

When the distance measurement result of the distance measuring means 1 does not detect a human body or the distance [D] to the human body is equal to or more than the predetermined distance Df on the long distance side, all the output signals are "L" level.
Since the transistors TR1 to TRn are all off and no current flows in the relay coils RL1 to RLn, the relay segments SW1 to SWn are all in the open state, and the control resistor R = R0.
Is. Therefore, the power switching means 3 is the load LD
The electric power is supplied so that the minimum brightness Lmin at which an object can be seen.

When a person approaches the illumination device and the distance measuring means 1 has a distance measuring result closer to the predetermined value Df, the signal generating means 2 is generated.
Changes the output signal S1 to "H" level, the transistor TR1 is turned on, a current flows through the relay coil RL1, the relay segment SW1 is closed, and the resistor R1 is connected to points P1 and P2.
Connected between points. That is, the control resistor R is the resistors R0 and R1.
Becomes a resistor RC1 connected in parallel. Since the value of the resistor R1 is set so that the value of the resistor RC1 becomes sufficiently small, the power switching unit 3 supplies the power of the load to the maximum brightness Lmax (L1).

When a person further approaches the lighting apparatus, the signal generating means 2 returns the output signal S1 to "L" and sets S2 to "H" level, so that the transistor TR2 is turned on and the current flows through the relay coil RL2. , The relay segment SW2 is closed, and the resistor R2 is connected between the points P1 and P2. That is,
The control resistor R is a resistor RC in which resistors R0 and R2 are connected in parallel.
It becomes 2. Since the resistance value of the resistor R2 is set to be slightly larger than that of the resistor R1, the power switching means 3 supplies a little less power to the load illumination than when the output signal S1 is "H". The brightness [L] is a brightness L2 which is slightly darker than the maximum brightness Lmax (L1). FIG. 1 shows the state at this time.

Similarly, as a person approaches the lighting device, the signal generating means 2 outputs the output signals S3, S4 ,.
········ Si, Si-1 and Si are set to “H” level sequentially, so P
The resistors connected to point 1 and point P2 are R3, R4, ...
It is sequentially switched to Ri-1 and Ri. Therefore, the resistance RC
Since the resistance values of 1 to RCi gradually increase, the power supplied by the power switching unit 3 to the illumination LD of the load gradually decreases and the brightness gradually decreases, and the distance to the person is a predetermined value Dn on the near side. In the following cases, electric power is supplied so that the output signal Si becomes "H" level and the brightness Li becomes appropriate.

In FIG. 2, the output signal is drawn so as to be switched when the distance [D] changes by a constant distance, but the present invention is not limited to this, and switching is performed according to a predetermined rule such as switching in inverse proportion to the square of the distance. May be.

In the above case, the minimum amount of power is supplied when there is no person, so the power consumption is low, and since the lighting is not completely turned off, the passerby does not feel uneasy. In addition, the lighting becomes maximum brightness when a person approaches a predetermined distance, and the brightness gradually decreases as a person approaches.
When the distance is equal to or less than the predetermined distance, the brightness is appropriately adjusted, so that the brightness can be substantially constant in the predetermined distance range.

Although the lighting device has been described above, a fan may be used as the load. In that case, when the person is far away, the power supply to the fan is increased to make a strong wind, and when the person is near, the fan is fed. It will reduce the power supply of the system to weaken the wind.

Contrary to the above example, there are some things such as a desk lamp for learning which may be bright when a person is near the lighting device and dark when a person is far away. Such control is obtained by setting the mode setting means 4 to M2, for example.
This case will be described with reference to FIGS.

When the mode setting means 4 is set to M2, the output of the signal generating means 2 becomes a mode in which S1 to Sn are used, and the signal generating means 2 sets a predetermined distance Df on the far side and a predetermined distance Dn on the near side. Then, the distance between Df and Dn is set as (n-1) distance ranges according to a predetermined rule (for example, equal intervals). Further, as the distance from the illuminating device to the person changes from the far side to the near side, the signal generating means 2 in turn outputs the output signal S.
n, Sn-1, ..., S3, S2, S1 and sequentially "H"
Set to level (Fig. 3 (a)). That is, when there is no person or when the person is separated by a predetermined distance or more, the output signals are all at the “L” level and the control resistor R is the resistor R0, so that the brightness Lmin is the minimum level at which an object can be seen. . When a person approaches a predetermined distance Df on the far side (Fig. 3
(D)), since the signal generating means 2 sets the output signal Sn to the "H" level, the transistor TRn is turned on via the resistor RBn, a current flows through the relay coil RLn, the relay intercept SWn is closed, and the resistor Rn is closed. Is connected between points P1 and P2, and the control resistor R is a resistor RCn in which resistors R0 and Rn are connected in parallel (FIG. 3 (b)). Since the value of the resistor Rn is set so that the size of the resistor RCn is a little smaller than the value of the resistor R0, the brightness at this time is the minimum brightness L.
It becomes slightly brighter than min (Fig. 3 (c)).

Thereafter, as the person approaches, the output signal Sn-
, ..., S3, S2 sequentially become "H" level, the resistance values of the resistors RCn-1, ... RC3, RC2 gradually decrease, and the brightness of illumination Ln-1 ,. , L2
Gradually rises. A predetermined distance Dn on the short-distance side
The maximum brightness Lmax is obtained when approaching to this point.

In the above case, the minimum power is supplied to the lighting when there is no person, so the power consumption can be small.
In addition, since there are many things such as trash cans and organizing boxes around the desk where such a desk lamp is placed, gradually increase the brightness as people get closer so that the surroundings can be seen better. Become. Further, when the distance becomes equal to or less than a predetermined distance, the brightness becomes maximum, so that sufficient brightness for learning can be secured.

In the above example, the minimum brightness is L
Although it is set to min, it does not supply power at all,
You may set so that it may be in a dark state.

Further, there are cases where it is desired to limit the maximum brightness or the minimum brightness depending on the installation condition (room size, etc.) of the lighting device and the purpose of use (partial lighting or indirect lighting, etc.).
In such a case, it is difficult to individually deal with the resistance values of the resistors R1 to Rn in FIG. 1, and it is desirable that the set resistance can be selectively used. Such control can be obtained by setting the terminal setting means 5. A case where the maximum brightness is set to L2 and the minimum brightness is set to Ln-1 when the mode setting means 4 is set to M2 (that is, in the example shown in FIG. 3) will be described with reference to FIG.

When the terminal setting means 5a is set to the position S2a corresponding to the output terminal S2, the signal generating means 2 has a distance [D] of Dn.
When it is closer than a, the output of the output terminal S2 is fixed to "H",
Even if the distance becomes Dn or less, the output terminal S1 is not set to "H". Therefore, the control resistor R is fixed to RC2 and the brightness [L] is fixed to L2. Similarly, the terminal setting means 5b
Is set to a position Sn-1a corresponding to the output terminal Sn-1, when the distance [D] is longer than Dfa, the output terminal Sn-1
Is fixed to "H", and the output terminal Sn is not set to "H" even if the distance [D] becomes longer than Df. Therefore, the control resistor R is fixed at RCn-1, and the brightness [L] is Ln.
It is fixed at -1.

As in the above example, the output terminal S corresponding to the position Ska (k = 1 to n-1) set by the terminal setting means 5a.
The output of k is "when the distance [D] is shorter than the predetermined distance.
It is fixed to H ″ and the brightness [L] is also fixed.
Position Smb set by the terminal setting means 5b (m = 2 to n)
The output of the output terminal Sm corresponding to is fixed to "H" when the distance [D] is longer than a predetermined distance, and the brightness [L] is also fixed.

In the above, when k = 1 and m = n, the outputs of the output terminals S1 and Sn are fixed.
As in the example shown in, the brightness is controlled from the minimum brightness to the maximum brightness.

Next, a second embodiment will be described with reference to FIG. In FIG. 5, R51 to R5n are resistors, and the resistance value is set such that R51 is the smallest and R5n is sequentially increased. SW51 to SW5n are switching elements which are turned on when the output signals S1 to Sn of the signal generating means 2 are at "H" level and are turned off at "L" level. PD is a light emitting element such as a light emitting diode,
When any of the switching elements SW51 to SW5n is turned on, the power source + is supplied via one of the resistors R51 to R5n.
Current flows from V and emits light.

RT is an element whose resistance changes according to the intensity of light, such as Cds (hereinafter referred to as resistance RT), and is arranged so as to receive the light of the light emitting element PD. VR0 is a variable resistor. The same reference numerals as those in FIG. 1 represent the same elements.

The resistor RT and the variable resistor VR0 connected in parallel become the control resistor R of the power switching means 53. As in the first embodiment, the power switching means 53 decreases the power supplied to the load LD when the value of the control resistor R is large, and increases the power supplied to the load LD when the value of the control resistor R is small.

Now, assuming that the output signal S1 of the signal generating means 2 becomes "H" level as a result of the distance measuring by the distance measuring means 1, the switching element SW51 is turned on and the power source +
A current flows through the light emitting element PD via V, the switching element SW51, and the resistor R51 to emit light. When the resistance R51 is selected, the resistance R is set so that the maximum power is supplied to the load LD.
51 is set to a small resistance value. Since the light emitting element PD becomes brighter, the resistance value of the resistor RT becomes smaller, and the control resistor R becomes a smaller resistance value, so that the maximum power is supplied to the load LD.

The output signals S1 to S of the signal generating means 2 are also provided.
When all n are at "L" level, all the switching elements are off, so that no current flows through the light emitting element PD and no light is emitted, and the resistance value of the resistor RT becomes very large. At this time, the variable resistor VR0 is adjusted so that the minimum power is supplied to the load LD.

As described above, the resistance value is set such that the resistance value R51 is the smallest and the resistance value R5n is sequentially increased. Therefore, the brightness of the light emitting element PD is such that the output signals from S1 to Sn.
, The control resistance R gradually becomes higher, and the power switching means 53 becomes the distance measuring means 1.
The output signal selected according to the result of the distance measurement can supply the electric power between the maximum and the minimum to the lighting which is the load.

The mode setting means 4 and the terminal setting means 5
The function of is the same as that of the first embodiment. In this embodiment, the structure of the power switching means is simplified and the cost can be reduced.

The mode setting means 4 and the terminal setting means 5 are storage means (ROM) in which various conditions are written by a known method, or storage means (EEPROM) in which various conditions can be written and rewritten from the outside. May be replaced with

Next, the third embodiment will be described with reference to the circuit block diagram of FIG. 6 and the distance diagram of FIG. 6, the same reference numerals as those in FIG. 5 represent the same elements.

In FIG. 6, reference numeral 7 denotes a division point setting means for setting points (hereinafter referred to as division points) for dividing the distance measuring range of the distance measuring means 1 into a plurality of distance areas. For the sake of simplification, it is now assumed that the distance measuring range is 0.5 m to 3.7 m and two division points Pa
FIG. 7 shows the case of dividing into three distance regions Z1, Z2, and Z3 by Pb and Pb. 7a in FIG. 6 is the division point Pa
The dividing point setting means sets (2.1 m), and the dividing point setting means 7 b sets the dividing point Pb (1.1 m). For the division point setting means 7a and 7b, for example, 4-bit digital switches are used.

Reference numeral 6 is a judging means for judging to which of the distance areas the distance measuring result of the distance measuring means 1 belongs.
For example, if the distance measurement result is 0.8 m, it is determined as the area Z1,
The output S61 is set to "H" level. Similarly, if the distance measuring result of the distance measuring means 1 is 1.5 m, it is determined as the area Z2, and the output S62 is determined. If the distance measuring result of the distance measuring means 1 is 3.0 m, it is determined as the area Z3. The output S63 is set to "H" level. Reference numeral 63 is a power switching means, and its basic configuration is the same as that of the second embodiment. SW61 to SW63 are switching elements similar to those in the second embodiment, and output S
The switches 61 to S63 are turned on in response to the "H" level. R61 to R63 are resistors, for example, R
61 is a small resistance value for supplying the maximum power to the load LD, R62 is a resistance value for supplying a medium power, and R
63 is set to a large resistance value so as to supply the minimum power.

Now, the operation when the load LD is used as illumination and the brightness of the illumination is changed depending on the distance to the person will be described. If the distance measurement result of the distance measuring means 1 is between 2.1 and 3.7 m,
The determination means 63 determines that it is in the distance area Z3 and outputs S6.
3 is set to "H" level, switching element SW6
When 3 is turned on, a current flows from the power source + V through the resistor R63, and the light emitting element PD emits light. Since the resistance value of the resistor R63 is high, the brightness of the light emitting element PD is dark, the resistance value of the resistor RT is high, and a minimum amount of electric power is supplied to the illumination as a load, so that the illumination remains at the minimum brightness. .

When a person approaches, the distance measurement result of the distance measuring means 1 becomes 0.
When it is between 5 and 1.1 m, the determination means 63 determines that the distance area Z
It is judged that the output is "H" level and the output is "L"
Since it is returned to the level and the output S61 is set to the "H" level,
Although the switching element SW61 is turned on and a current flows from the power source + V through the resistor R61, the resistance value of the resistor R61 is sufficiently small, so that the light emitting element PD emits light brightly, and the resistance value of the resistor RT becomes sufficiently small, so that a load is applied. It provides maximum power to a given lighting, so the lighting is at maximum brightness.

Similarly, the distance measurement result of the distance measuring means 1 is 1.1 to
If it is within 2.1 m, the determination means 63 determines that it is in the distance area Z2 and sets the output S62 to "H" level.
Although the switching element SW62 is turned on and a current flows from the power source + V through the resistor R62, the resistance value of the resistor R62 is between the resistors R63 and R61. Intermediate, resistance RT
The resistance value of is also an intermediate value, and the illumination, which is a load, has an intermediate brightness between the minimum brightness and the maximum brightness.

As described above, the electric power supplied to the load can be easily switched by the output of the determination means for outputting to which set distance region the distance measurement result belongs.

In the above embodiment, the case where the load LD is mainly illumination has been described, but the load is not limited to this and may be a fan or a heater. Further, although the power switching means uses the triac to switch the power of the AC power source, the DC power source may be switched using a thyristor or a transistor.

Further, in the above embodiment, the electric power to the load is simply increased or decreased depending on the distance. However, for lighting of a dance hall or disco, for example, the electric power is changed so as to randomly change the brightness according to the distance. May be switched.

[0052]

According to the present invention, since the electric power of the load can be switched according to the distance measurement result of the distance measuring means, when it is applied to a lighting device or the like, it can be used in various ways according to the purpose. Moreover, it is possible to prevent unnecessary power consumption.

Further, by making the illumination bright when the person is far away and making the illumination appropriate brightness when the person approaches, the brightness of the place where the person is present is substantially constant within a predetermined range. You can use it like doing.

When a plurality of lighting devices are installed in a corridor or the like, the brightness of the lighting can be changed according to the distance to a person. Therefore, it is sufficient to install bright lighting at an appropriately long interval. Therefore, it is not necessary to install a large number of lighting devices at short intervals, unlike when using dark lighting, and the installation cost is low. Even if you install bright lights at long intervals,
Since it does not light up for a long time as in the conventional case, there is an effect that power consumption can be reduced.

[Brief description of drawings]

FIG. 1 is a circuit block diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the first embodiment of the present invention.

FIG. 3 is a diagram for explaining another operation of the first embodiment of the present invention.

FIG. 4 is a diagram for explaining another operation of the first embodiment of the present invention.

FIG. 5 is a circuit block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 6 is a circuit block diagram showing a configuration of a third exemplary embodiment of the present invention.

FIG. 7 is a distance diagram for explaining a third embodiment of the present invention.

[Explanation of symbols]

 1 distance measuring means 2 signal generating means 3, 53, 63 power switching means 6 judging means

Claims (5)

[Claims] 1. A distance measuring means for measuring the distance to an object, and distance data measured by the distance measuring means,
A power control device comprising signal generating means for outputting a signal for increasing / decreasing the power supplied to the load, and power switching means for switching the power supplied to the load according to the signal from the signal generating means. 2. The signal generating means according to claim 1, wherein the signal generating means outputs a signal for decreasing the power supply when the distance data is short distance data and for increasing the power supply when the distance data is long distance data. A power control device, which is a signal generating means. 3. The signal generating means according to claim 1, wherein the signal generating means outputs a signal for increasing the supply power when the distance data is a short distance data, and for decreasing the supply power when the distance data is a long distance data. A power control device, which is a signal generating means. 4. The electric power supply according to claim 1, wherein the signal generation means changes the supplied power when the distance data is data closer to a near side predetermined value or farther from a far side predetermined value. A power control device, which is a signal generating unit that outputs a signal that does not prevent the power control device. 5. A distance measuring means for measuring a distance to an object, and a distance measuring result of the distance measuring means belongs to which distance area among a plurality of distance areas divided within the distance measuring range of the distance measuring means. A power control device having a judging means for judging whether or not the electric power is supplied to the load according to the result of the judging means.