JP5816808B2 - Non-contact liquid detection device - Google Patents

Non-contact liquid detection device Download PDF

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JP5816808B2
JP5816808B2 JP2011004697A JP2011004697A JP5816808B2 JP 5816808 B2 JP5816808 B2 JP 5816808B2 JP 2011004697 A JP2011004697 A JP 2011004697A JP 2011004697 A JP2011004697 A JP 2011004697A JP 5816808 B2 JP5816808 B2 JP 5816808B2
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light
container
liquid
receiving element
light receiving
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JP2012145477A (en
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正芳 宮原
正芳 宮原
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パナソニックIpマネジメント株式会社
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Description

The present invention relates to a non-contact liquid detection device that detects the presence or absence of liquid inside a container mounted on an electric device that uses the liquid stored in the container without contacting the liquid.

Conventionally, as this kind of non-contact liquid detection and detection device , an ultrasonic signal is irradiated toward the surface of the liquid, and at this time, the presence or absence of the liquid is detected from a change in the reflection time of the ultrasonic signal from the surface of the liquid. Although the method is known, the configuration utilizing this reflection of ultrasonic signals requires high accuracy for expensive measuring instruments and liquid detection because the price of ultrasonic elements that transmit and receive ultrasonic signals is very expensive. is utilized only in the device to be, it was not lightning been utilized in a wide general electric appliances.

Relatively Examples which can be utilized in low cost and widely general electrical equipment may an application of the refraction action of light by the liquid, as an example, outside the container constitutes a light emitting element and a light receiving element in the transparent member The light is output from the light emitting element, and the output light is transmitted through the container and refracted at the boundary surface between the container and the liquid. A device that detects the presence or absence of liquid is known (for example, see Patent Document 1).

It will be described below with reference to FIG. 15 with its electrical equipment.

Other than perpendicular to the boundary surface 102 between the container side wall of the liquid to be detected 101 inside the container 100 and the liquid in contact with the corner of the container 100 that stores liquid made of polyethylene or the like that transmits infrared rays. The infrared light emitting element 103 is arranged so that infrared rays are incident at an angle, and the infrared light receiving element 104 is arranged so as to be positioned on an extension line in the incident direction of the infrared rays. The light receiving element 104 is arranged to sandwich the corner of the container 100 from the outside,
A control circuit unit 105 that performs signal processing of an electrical output signal that is proportional to the amount of light received from the infrared light receiving element 104 is provided. If the liquid to be detected 101 is not present inside the container 100, an infrared light emitting element is provided. The infrared light output from 103 is transmitted through the container 100 and directly input to the infrared light receiving element 104, so that a large electrical output signal is output from the infrared light receiving element 104, and the inside of the container 100 is covered. When the detection liquid 101 is present, the infrared light output from the infrared light emitting element 103 is refracted at the boundary surface 102 between the container 100 and the liquid 101 to be detected, and is bent in a direction where the infrared light receiving element 104 is not installed. Thus, since the infrared light receiving element 104 outputs an electrical output signal that is lower than the case where there is no liquid to be detected 101 inside the container 100, the infrared light receiving element 104. And so as to determine the presence or absence of internal detection target liquid 101 of the container 100 in the electrical output signal control circuit unit 105 from the change in which is et output.

JP 2000-329609 A

In such a conventional non-contact liquid detection device , and when the liquid to be detected 101 is inside the container 100 that transmits infrared light, the infrared light output from the infrared light emitting element 103 is transmitted to the container 100 and the liquid to be detected. Since the infrared light receiving element 104 is refracted at the boundary surface 102 and bent in a direction in which the infrared light receiving element 104 is not installed, the infrared light receiving element 104 is lowered as compared with the case where the liquid 101 to be detected is not present inside the container 100. Since an electrical output signal is output, the control circuit unit 105 determines the presence or absence of the liquid 101 to be detected from the change in the electrical output signal output from the infrared light receiving element 104. Therefore, the part of the container 100 that is in direct contact with the liquid 101 to be detected is limited to the infrared light transmitting material, and the object to be stored inside the container 100 for long-term use. Using the liquid 101 to be detected, which may cause dirt on the inner surface of the container 100 that is in direct contact with the liquid 101 to be detected due to the influence of the exit liquid 101, and the infrared light transmitted therethrough may be significantly reduced. It has a problem that can not be used with the equipment.

Therefore, the present invention solves the above-described conventional problems, and it is not necessary to limit the constituent materials of the liquid container, and a device that may cause dirt in a portion that directly contacts the liquid inside the container. It is an object of the present invention to provide a non-contact liquid detection device capable of detecting the presence or absence of liquid inside a container in a non-contact manner for a long period of time in electrical equipment using various liquids.

State In order to achieve this object, the present invention is, in a main body constituting an outer shell of the device, which includes a drive kinematic mechanism, a container having a space therein, and retaining the liquid inside the container In electrical equipment that provides unique functions in
An interior light emission element and a light receiving element of the body, the light receiving direction of the irradiation direction and the light receiving element of light of the light emitting element is a same direction, the internal liquid from the upper direction of the container surface directs the direction, the light is irradiated from the light emitting element, the light reflected is received by the light receiving element, to operate the drive mechanism, and fluctuation occurs in the surface of the liquid, the electrical output from the light receiving element during the determination time value of the signal is defined in advance, it is also the you determine that the liquid is in the interior of the container when the fluctuating, thereby is to achieve the intended purpose.

According to the present invention, electricity is provided in the main body constituting an outer shell of the device, and drive kinematic mechanism, comprises a container having a space therein, the characteristic function of a state holding the liquid inside the container in equipment, and a light emission element and a light receiving element inside the body, the irradiation direction of the light of said light emitting element
Receiving direction of the light receiving element is a same direction, directs toward the surface of the liquid inside the upper direction of the container, the light irradiated from the light emitting element receives the light reflected by the light receiving element When the drive mechanism is operated, the liquid surface fluctuates, and when the value of the electric signal output from the light receiving element fluctuates for a predetermined determination time, there is liquid inside the container. by you determine, by measuring the electrical signal output from the light receiving element when it is lit light-emitting element in the operating state of the drive mechanism, the value of the electric signal output from the light receiving element is defined in advance Since it can be determined that the liquid is present inside the container when it fluctuates during the determination time, the presence or absence of the liquid inside the container can be detected directly from the upper direction of the liquid in a non-contact manner. Therefore, it is not necessary to limit the components of the container, and it is non-contact for a long time even in electrical equipment that uses various liquids including equipment that may cause contamination in the part that directly contacts the liquid inside the container. Thus, the effect that the liquid inside the container can be detected can be obtained.

Sectional block diagram which shows the structure of the apparatus provided with the non-contact liquid detection apparatus of Embodiment 1 of this invention. Cross-sectional configuration diagram showing an enlarged main part of the liquid detection device Circuit diagram showing main circuit configuration of the liquid detection device Detection state diagrams showing the detection state of the liquid detection device in a simplified manner ((a) first detection state diagram, (b) second detection state diagram) The chart which showed the state of the electric signal output from light irradiation of a light emitting element with which the liquid detection device is provided, and a light receiving element A chart showing a state in consideration of the light irradiation of the light emitting element provided in the liquid detection device and the influence of the external light of the electric signal output from the light receiving element Cross-sectional configuration diagram showing the configuration of a device provided with the vibration means in the liquid detection device Cross-sectional configuration diagram showing the configuration of the vibration means included in the liquid detection device Cross-sectional configuration diagram showing the configuration of a device provided with air blowing means in the liquid detection device Cross-sectional configuration diagram showing the configuration of the air blowing means provided in the liquid detection device Sectional block diagram which shows the structure of the apparatus provided with the non-contact liquid detection apparatus of Embodiment 2 of this invention. The chart figure which showed the state of the electric signal output from the light receiving element with which the liquid detection apparatus is equipped Sectional block diagram which shows the structure of the apparatus provided with the non-contact liquid detection apparatus of Embodiment 3 of this invention. The chart figure which showed the state of the electric signal output from the light receiving element with which the liquid detection apparatus is equipped Cross-sectional configuration diagram showing an enlarged main part of a conventional liquid detection device

Contactless liquid detection apparatus according to claim 1 of the present invention, in a main body constituting an outer shell of the device, and drive kinematic mechanism, comprises a container having a space therein, and retaining the liquid inside the container in electrical equipment that provides functionality specific state, and an internal on light emission element and a light receiving element of the body, the light receiving direction of the irradiation direction and the light receiving element of light of the light emitting element is the same direction , directs toward the surface of the liquid inside the upper direction of the vessel, irradiated with light from the light emitting element, the light reflected is received by the light receiving element, to operate the drive mechanism, fluctuation in the surface of the liquid is generated during the determination time value of the electric signal output from the light receiving element is defined in advance, Ru shall der to determine that the liquid is in the interior of the container when the fluctuating. As a result, the electrical signal output from the light receiving element when the light emitting element is turned on in the operating state of the drive mechanism is measured, and the value of the electrical signal output from the light receiving element is within a predetermined determination time. Since it can be determined that the liquid is present inside the container when it is fluctuating, the presence or absence of the liquid inside the container can be detected directly and in a non-contact manner from above the liquid. There is no need to limit the components, and electrical equipment that uses a variety of liquids, including equipment that may contaminate the parts that are in direct contact with the liquid inside the container, can be contacted for a long time without contact. It is possible to detect the liquid.

Further, a light shielding unit may be arranged on the light receiving element so that only light from the surface direction of the liquid inside the container is transmitted and light incident from other than the surface direction of the liquid is blocked . As a result, light from other than the surface direction of the liquid is blocked by the light shielding means and cannot enter the light receiving element, and only the light from the liquid surface direction is received by the light receiving element. There is an effect that it is possible to provide a configuration capable of detecting the liquid inside the stable container which is not easily affected by non-contact.

In addition, the light emitting element is turned on and off intermittently, and the difference between the electrical signals output from the light receiving element when the light emitting element is turned on and off is obtained to determine whether the light emitting element is turned on or off. When the electrical signal output from the light receiving element is excluded due to the influence of the ambient light of the device, there is liquid inside the container when the difference value of the electrical signal fluctuates for a predetermined determination time. it may be determined. This measures the electrical signal output from the light receiving element when the light emitting element is intermittently lit in the operating state of the drive mechanism, and the electrical signal output from the light receiving element obtained when the light emitting element is lit From the result of subtracting the electrical signal output from the light receiving element obtained when the light emitting element is turned off, if there is a variation in the electrical signal in the preset determination time, there is liquid inside the container Therefore, there is an effect that it is possible to provide a configuration that is less susceptible to the influence of light around the device and that can detect a more stable liquid inside the container in a non-contact manner.

The driving mechanism, the container may be pressurized Fute stage vibrating from the outside of the container. As a result, the liquid level of the liquid stored inside the container can be made to fluctuate by vibrating the container with the vibration means, so that even in a device having a configuration in which no waves or fluctuations occur on the liquid level of the liquid. There is an effect that it is possible to detect the presence or absence of the liquid inside the container by judging the fluctuation of the electric signal output from the light receiving element in a state where the container is vibrated by the vibrating means.

The driving mechanism may be a blowing means for blowing air toward the interior of the container. As a result, the liquid level of the liquid held inside the container can be fluctuated by the air blown by the blower means. Therefore, even in a device having a configuration in which no waves or fluctuations occur on the liquid level, the air blown by the blower means There is an effect that it is possible to detect the presence or absence of the liquid inside the container by judging the fluctuation of the electric signal output from the light receiving element in the state where the liquid level of the liquid held inside the container is fluctuated. .

In addition, the container is detachable from the main body, and the main body includes light reflecting means facing the irradiation direction of the light emitting element on the lower surface side of the mounting position of the container. directly reflect irradiated light, reflected previously defined the electric signal output from the light receiving element that receives light as determine a constant threshold was, electrical output from the light receiving element by emitting the light emitting element during the determination time value of the signal is defined in advance, the from the body as long as the determination threshold value or more may be judged as the container is removed. As a result, it can be determined that the container has been removed from the main body if the value of the electrical signal output from the light receiving element is equal to or greater than the determination threshold value for a predetermined time. In addition, there is an effect that it is possible to provide a configuration having a function of detecting the removal of the container from the main body.

The container can be attached to and detached from the main body, and the main body has a mounting portion of the container.
A light absorption means is provided on the lower surface side of the light emitting device so as to face the irradiation direction of the light emitting element, and the light irradiated from the light emitting element is directly reflected and output from the light receiving element that receives the reflected light. previously defining an electrical signal as a determination threshold value, during the determination time value of the electric signal output from the light receiving element by emitting the light emitting element is defined in advance, the from the body as long as or smaller than the value of the determination threshold value the container is removed and may be judged. As a result, it can be determined that the container has been removed from the main body if the value of the electrical signal output from the light receiving element is equal to or less than the determination threshold value for a predetermined time. In addition, there is an effect that it is possible to provide a configuration having a function of detecting the removal of the container from the main body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
In this description, a humidification device that provides a humidification function by utilizing water used in a general home will be described as an example of implementation in an electric device.

  As shown in FIG. 1, an electric device serving as a humidifying device includes a drive mechanism 2 for blowing air inside a main body 1 constituting an outer shell, a container 3 having a space inside, and the container. 3 is provided with a liquid 4 that is water held in the interior of the container 3, and the liquid 3 that is water is sucked up inside the container 3 to evaporate the water by vaporization and evaporation. The humidifying filter 5 for humidifying the liquid is disposed so that the lower part is immersed in the liquid 4.

  An intake opening 6 having a plurality of openings for sucking outside air inside the main body 1 by blowing air from the drive mechanism 2 is provided on one surface of the outer shell of the main body 1, and suction is performed on the upper surface side of the outer shell of the main body 1. A discharge opening 7 is provided for blowing outside air to the outside of the main body 1 and blowing it.

  The outside air sucked into the inside of the main body 1 through the intake opening 6 by the air blowing of the drive mechanism 2 passes through the inside of the container 3 and then blows out from the discharge opening 7 to the outside of the main body 1. 8 is provided.

  In addition, the path | route of the ventilation which flows through this ventilation air path 8 is typically shown with the arrow line by the arrow in FIG.

  Here, the drive mechanism 2 for blowing air is, for example, a general electric blower that obtains blown air by rotating blades by the rotational force of an electric motor.

  In addition, the humidifying filter 5 is, for example, a paper fiber, cotton fiber, or a polyvinyl alcohol-based synthetic fiber excellent in water absorption made of a nonwoven fabric or a three-dimensional weave having a large number of openings, thereby increasing the contact surface area with air. By stacking a plurality of fibers, it is configured as a cubic water-absorbing evaporating material with improved water absorption, air permeability, and natural evaporation of water.

  As described above, in the electric device configured as a humidifying device, when the water of the liquid 4 is held in the space of the container 3 disposed inside the main body 1, the humidification provided inside the container 3 The filter 5 is in a state where the lower part is immersed in the liquid 4 and absorbs water in the liquid 4.

When the humidifying filter 5 absorbs water as the liquid 4 and operates the driving mechanism 2 to blow air, the air is sucked into the main body 1 from the air intake opening 6 through the air blowing passage 8 and is supplied to the container 3. A flow of wind that passes through the humidifying filter 5 disposed inside and blows out from the discharge opening 7 to the outside of the main body 1, thereby the liquid 4 that has absorbed water when the blown outside air passes through the humidifying filter 5. Since some water naturally evaporates, the blown air is in a humidified state, and the humidified air is blown out of the main body 1 from the discharge opening 7, which is a unique function as a humidifier. Is to provide.

  Therefore, in the humidifier configured as described above, when all the water, which is the liquid 4 held inside the container 3, evaporates by performing the humidification, it does not function as a humidifier. By detecting the presence or absence of the liquid 4, it is necessary to prompt the user to replenish the liquid 4 in the absence of the liquid 4.

Thus, in order to detect the presence / absence of the liquid 4 inside the container 3, the liquid detection means 9 is arranged above the space of the container 3 inside the main body 1.

As shown in the enlarged view of FIG. 2, the liquid detecting means 9 includes a light emitting element 10 that emits light and a light receiving element 11 that outputs an electric signal in accordance with the amount of light received. The light irradiation direction of the light emitting element 10 and the light receiving direction of the light receiving element 11 are arranged side by side so as to face the surface direction of the liquid 4 inside the container 3.

  Here, since the light emitting element 10 is not intended to irradiate light for the purpose of displaying or notifying the state of the device, it is an element that emits light that can avoid the inconvenience of the user who cannot be visually recognized and is not recognized. In addition, since an element that is relatively inexpensive and highly available is desirable, for example, an infrared LED that emits infrared light by passing a direct current is used.

  Here, the light receiving element 11 is required to have a function of receiving infrared light emitted from the light emitting element 10 and outputting an electric signal in accordance with the amount of received light, and a relatively inexpensive and highly available element is desirable. Therefore, for example, a phototransistor that can be encapsulated with a resin having an optical filter performance that attenuates visible light other than infrared light emitted by the light emitting element 10 and can change the conduction current according to the amount of received light. It is what is used.

  Further, the light receiving element 11 is provided with an opening only in the light receiving direction of the light receiving element 11 in the surface direction of the liquid 4 inside the container 3 so that light from other than the surface direction of the liquid 4 inside the container 3 is not incident as much as possible. A cylindrical light shielding means 12 is mounted.

  Here, it is desirable that the light shielding means 12 is made of a material that does not transmit light and has high electrical insulation properties. For example, a resin material such as ABS is processed into a cylindrical shape by mold shaping.

  Further, the light emitting element 10 and the light receiving element 11 have high transparency of infrared light irradiated by the light emitting element 10 with respect to the surface direction of the liquid 4 inside the container 3 and are excellent in electrical insulation, such as polycarbonate and acrylic. The protective window 13 made of resin is fixed and arranged so that the liquid 4 inside the container 3 and the dust in the air are prevented from directly adhering to the light emitting element 10 and the light receiving element 11. It is what you are doing.

Next, the circuit configuration of the liquid detection means 9 will be described with reference to FIG.

  As shown in FIG. 3, the infrared LED as the light emitting element 10 is connected in series with an intermittent DC power supply 14 for intermittently applying a DC power supply to the anode side and a current limiting resistor 15a on the cathode side. doing.

  In addition, the phototransistor serving as the light receiving element 11 is connected to the collector side with a positive potential of a DC power supply 16 serving as a power supply source, and on the emitter side is a resistor for taking out the current conducted by the phototransistor as a voltage signal. 15b are connected in series.

  Here, the intermittent DC power supply 14 is not particularly limited as long as it can output a stabilized DC voltage intermittently. For example, a step-down stabilization that obtains a stabilized DC low-voltage power supply from a commercial power supply. The power of the stabilized power supply device that makes the power of the switching power supply device, the primary battery, or the secondary battery constant by a voltage stabilizing regulator is intermittently applied at a constant interval by a switching element such as a transistor and applied to the light emitting element 10. It is comprised as follows.

  The power supply applied to the light emitting element 10 by the intermittent DC power supply 14 is not particularly specified. For example, the voltage is applied to the light emitting element 10 for 5 msec with a voltage of 5 V as a period of 50 msec. The resistance value of the resistor 15a is selected so that a current of about 20 mA to 50 mA flows through the light emitting element 10 when a voltage is applied.

  Here, the configuration of the DC power supply 16 is not limited as long as it can output a stabilized DC voltage. For example, a step-down type stabilized switching power supply device that obtains a stabilized DC low-voltage power supply from a commercial power supply or a primary power supply. In addition, the power of the stabilized power supply device that makes the power of the secondary battery constant by a voltage stabilizing regulator is applied to the light receiving element 11.

  Note that the voltage applied to the light receiving element 11 by the DC power source 16 is, for example, 5 V. At this time, the light emitted from the light emitting element 10 is infrared light reflected in the surface direction of the liquid 4 inside the container 3. The resistance value of the resistor 15b is set so that an output voltage of about 2.5 V is generated at both ends of the resistor 15b when light enters the light receiving element 11. For example, the resistance value is set as a value from 10 kΩ to 200 kΩ. To do.

  With the circuit configuration as described above, when the light, which is infrared light reflected from the surface direction of the liquid 4 inside the container 3 is incident on the light receiving element 11 after being irradiated by the light emitting element 10, the resistance 15b is incident on the light receiving element 11. The voltage at both ends corresponding to the amount of light generated is generated, so that the state of change in the voltage value generated at both ends of the resistor 15b can be handled as an electrical signal corresponding to the amount of light received from the light receiving element 11. Become.

  Next, FIG. 4 shows an output from the light receiving element 11 according to FIG. 5 while showing a state of change in the amount of light irradiated from the light emitting element 10 and reflected from the surface direction of the liquid 4 inside the container 3 and incident on the light receiving element 11. The relationship with the electrical signal to be performed will be described.

Here, FIG. 4 shows the state of the liquid 4 held inside the container 3 and the light irradiated by the light emitting element 10 on the light incident on the light receiving element 11 irradiated from the light emitting element 10 and reflected from the surface direction of the liquid 4. indicates the center of the intensity distribution in a solid arrow lines, the liquid detection device shown in simplified by representing the center of the intensity distribution of light incident from the direction of the liquid 4 to the light receiving element 11 by the dashed arrow line FIG. 5 is a chart showing the light irradiation of the light emitting element 10 and the state of the electrical signal output from the light receiving element 11.

  In a general electric device that includes the driving mechanism 2 described so far and provides a specific function by applying the liquid 4, the light incident on the light receiving element 11 has two states.

  First, as shown in FIG. 4A, the first state is a state where the liquid surface 4a of the liquid 4 is kept flat and free from waves and fluctuations. Part of the light irradiated by the light is transmitted through the liquid 4 or absorbed by the liquid 4, but a part of the light is directed in one direction toward the light emitting element 10, which is the incident direction of light due to the specular reflection action on the liquid surface 4 a Therefore, the light receiving element 11 is always incident with a substantially constant amount of light.

  First, as shown in FIG. 4B, the second state is a state in which waves and fluctuations are present on the liquid surface 4a of the liquid 4. At this time, the liquid surface 4a of the liquid 4 fluctuates. Therefore, the direction of the specular reflection of the liquid surface 4a is not constant, so that a part of the light irradiated by the light emitting element 10 changes in an arbitrary direction on the light emitting element 10 side by the action of the specular reflection of the swayed liquid 4. Accordingly, the light receiving element 11 is always incident with a light amount that fluctuates and fluctuates.

  When the liquid 4 is not present inside the container 3, although not shown in the drawing, the light irradiated by the light emitting element 10 is reflected by the inner surface of the container 3 and enters the light receiving element 11, and is solid. In general, since the reflection of light is also constant on the inner surface of the container 3 where the position of the arrangement is regulated inside the main body 1, there is no wave or fluctuation on the liquid surface 4 a of the liquid 4, and the light receiving element 11 always has The state is similar to the state in which a substantially constant amount of light is incident.

  In each of the above two states, as shown in FIG. 5, an electrical signal corresponding to the state of the incident light quantity is output from the light receiving element 11.

  FIG. 5 shows the light receiving element 11 when the light is emitted with the light emitting element 10 intermittently turned off and on as shown by the waveform 17a according to the circuit configuration described in FIG. The change of the electric signal is shown in the state of temporal transition by expressing the electric signal output from the waveform 17b and the waveform 17c with the vertical axis ranging from 0V to 5V.

  When there is no wave or fluctuation on the liquid surface 4a of the liquid 4 and light of a constant amount is always incident on the light receiving element 11 and when the liquid 4 does not exist inside the container 3, the incident light fluctuates. In general, the electric signal output from the light receiving element 11 when the light emitting element 10 is lit as shown by the waveform 17b is also a substantially constant value as represented by Sh in the figure. As shown in the drawing, the width of the fluctuation is expressed as Sw1 and is in a normal state with almost no fluctuation.

  In the state in which waves and fluctuations exist on the liquid surface 4a of the liquid 4 and light with a constantly varying light quantity is incident on the light receiving element 11, since the incident light fluctuates, the waveform 17c is usually used as shown in FIG. In the state where the light emitting element 10 is lit, the fluctuation range of the electric signal output from the light receiving element 11 fluctuates as represented by Sw2 in the drawing.

  Therefore, if there is a wave or fluctuation on the liquid surface 4 a of the liquid 4, the liquid 4 is present inside the container 3 if there is a fluctuation in the electrical signal output from the light receiving element 11.

  Here, in an electrical device equipped with the drive mechanism 2, in the state in which the drive mechanism 2 is operating, although there is a large or small difference due to vibration based on the operation of the drive mechanism 2, the liquid level 4a usually fluctuates. Therefore, by checking the electric signal output from the light receiving element 11 in the state where the driving mechanism 2 is operated, it is determined that the liquid 4 inside the container 3 exists if the electric signal fluctuates. Will be able to.

  In mounting on an actual device, the light emitting element 10 is turned on in a state where the liquid 4 is put in the container 3 in the target device and the liquid level 4a is not fluctuated. The liquid level 4a is adjusted by adjusting the resistance value of the resistor 15b shown in FIG. 3 so that the electric signal to be output becomes a value in the vicinity of the center of the output range of the electric signal (in this embodiment, the range of 0V to 5V). Therefore, the margin for the output range of the fluctuation range of the electric signal when fluctuation occurs in the signal can be set large.

In addition, the value of the electrical signal output from the light receiving element 11 in the state where the light emitting element 10 expressed as Sb in FIG. 5 is turned off is external light from outside the main body 1 other than the light emitting element 10. Etc. are output by being incident on the light receiving element 11, and the value of the electric signal output from the light receiving element 11 when the light emitting element 10 is turned on is also added to the value of Sb. Will be.

  Therefore, next, determination of the presence / absence of the liquid 4 in a state in which the influence of external light other than the light emitting element 10 is also considered will be described with reference to FIG.

  FIG. 6 also shows the light receiving element 11 when the light emitting element 10 is intermittently turned off and turned on as shown by the waveform 17a according to the circuit configuration described in FIG. The electric signal output from the motor is expressed as a waveform 17d and a waveform 17e with the vertical axis ranging from 0V to 5V, and there are waves and fluctuations on the liquid surface 4a of the liquid 4 where the drive mechanism 2 is operated in the device. The change of the electric signal in the state of being in the state is shown in the state of temporal transition.

  When a wave or fluctuation is present on the liquid surface 4a of the liquid 4, as described above, the light is output from the light receiving element 11 in a state where the light emitting element 10 indicated by the waveform 17d in the drawing is lit. The fluctuation range of the electric signal fluctuates as represented by Swa in the figure.

  In the figure, when the influence of extraneous light other than the light emitting element 10 is newly added at the time point expressed as Pa, an electric signal output from the light receiving element 11 is also indicated by a waveform 17d even when the light emitting element 10 is turned off. As shown, the value indicated as Sd on the figure based on the influence of extraneous light is added and rises.

  However, the electric signal output from the light receiving element 11 when the light emitting element 10 indicated by the value of Sd is turned off is always measured, and the electric signal output from the light receiving element 11 when the light emitting element 10 is turned on. When the value of Sd is subtracted from the signal value, it is output from the light receiving element 11 based on only the lighting light of the light emitting element 10 excluding the influence of extraneous light, as shown by the waveform 17e in the figure. An electric signal can be obtained.

  As described above, when the value of Sd is subtracted from the value of the electrical signal output from the light receiving element 11 in a state where the light emitting element 10 is turned on, the light is received based only on the lighting light of the light emitting element 10 excluding the influence of external light. Since an electric signal output from the element 11 can be obtained, the state of fluctuation of the electric signal output from the light receiving element 11 represented as Swa in the figure is before and after subtraction of the value of Sd. Since there is no change, the waveform 17e after correction is obtained by subtracting the value of Sd, and if this waveform 17e has a fluctuation indicated by Swe, this effect is excluded even in a state where it is affected by external light. Thus, it can be accurately determined that the liquid 4 is present inside the container 3.

  In addition, since the fluctuation of the electric signal output from the light receiving element 11 when the liquid 4 exists in the container 3 is based on the wave or fluctuation of the liquid surface 4a of the liquid 4, the fluctuation of the electric signal The period also depends on the fluctuation period of the liquid surface 4a.

Since the period of fluctuation of the liquid surface 4a is around 10 Hz according to the result of actual test confirmation when the target liquid 4 is water, for example, in a time interval of several milliseconds to several tens of milliseconds, Even if the liquid 4 is present inside the container 3, there is a possibility that fluctuations in the electrical signal output from the light receiving element 11 may not be confirmed. By setting the time for determining the fluctuation of the electric signal as the determination time ta, it is possible to more accurately determine the presence of the liquid 4. This determination time ta is 0 when the target liquid 4 is, for example, water. The time is set between 1 second and 1 second in consideration of the response of detection.

  The means for determining whether or not the liquid 4 is present inside the container 3 by confirming the fluctuation in the electrical signal output from the light receiving element 11 will not be described in detail, but electrical control is performed. In an electrical device having a function, a central processing unit (CPU), an input / output device, an analog / digital conversion input device (A / D), a read-only memory (ROM) are usually used as control means for controlling the device. ), It is common to have a so-called one-chip microcomputer with a built-in read / write memory (RAM). The output electrical signal is taken inside a one-chip microcomputer with an analog / digital conversion input device (A / D). In this case, the algorithm is defined so that the determination of the liquid 4 is carried out inside the one-chip microcomputer, and the specified program is stored in a read-only memory (ROM) to determine the liquid 4 Can be configured.

According to such a configuration, the main body 1 is provided with the drive mechanism 2 and the container 3 holding the liquid 4 inside, and the liquid 4 held inside the container 3 is utilized by operating the drive mechanism 2. Thus, in the electric device that provides a specific function, the light emitting element 10 that emits light to the upper side of the space of the container 3 inside the main body 1, and the light receiving element 11 that outputs an electric signal according to the amount of received light, Is provided with a liquid detection means 9 in which the light irradiation direction of the light emitting element 10 and the light receiving direction of the light receiving element 11 are arranged side by side toward the surface direction of the liquid 4 inside the container 3. The electric signal output from the light receiving element 11 when the light emitting element 10 is intermittently lit is measured, and the light emitting element is calculated from the electric signal output from the light receiving element 11 obtained when the light emitting element 10 is lit. If 10 goes out In the result obtained by subtracting the electrical signal output from the light receiving element 11, if there is a variation in the electrical signal at the preset determination time ta, it can be determined that the liquid 4 is present inside the container 3. Therefore, since it is possible to detect the presence or absence of the liquid 4 inside the container 3 directly and in a non-contact manner from above the liquid 4, there is no need to limit the constituent materials of the container 3, and the liquid inside the container 3 can be detected. 4 and Ru can detect the liquid inside 4 of the container 3 even over a long period without contact in an electric device using a variety of liquid 4 including the direct contact site equipment that might stain occurs.

Further, the light receiving element 11 is provided with an opening only in the light receiving direction of the light receiving element 11 in the surface direction of the liquid 4 inside the container 3 so that light from other than the surface direction of the liquid 4 inside the container 3 is not incident as much as possible. Since the cylindrical light shielding means 12 is mounted, light from other than the surface direction of the liquid 4 is blocked by the light shielding means 12 and cannot enter the light receiving element 11. by receiving only by the light receiving element 11, Ru can detect the liquid inside 4 of the container 3 in a more stable non-contact less sensitive to ambient light of the device.

Depending on the configuration of the device, even when the drive mechanism 2 is operating, it is effective to the extent that the presence or absence of the liquid 4 can be determined from fluctuations in the electrical signal output from the light receiving element 11 due to vibration based on the operation of the drive mechanism 2. in waves or fluctuations on the liquid surface 4a of the liquid 4 is caused such squid occur such have equipment sufficient to produce the variations, over, and could not determine the presence of liquid 4 in the structure has been described.

  However, in such an apparatus that does not generate a wave or fluctuation on the liquid surface 4a of the liquid 4, as shown in FIG. By arranging and arranging the means 18 together, the presence or absence of the liquid 4 inside the container 3 can be determined by judging the fluctuation of the electric signal output from the light receiving element 11 in the state where the container 3 is vibrated by the vibration means 18. Can be detected.

  Here, for example, as shown in the enlarged view of the vibration means 18 in FIG. 8, the vibration means 18 is an operating shaft that moves linearly in a cylindrical electromagnetic coil 19 that generates a magnetic force when a DC voltage is applied. When a magnetic force is generated by applying a DC voltage to the electromagnetic coil 19, the operating shaft 20 is attracted and moved by the magnetic force generated in one direction of the axial direction, so that a driving force in one direction in the axial direction is obtained. Using an electromagnetic plunger 21 that can be generated, an impact absorber 22 made of soft synthetic rubber or silicon rubber at the tip of the driving axis 20 of the electromagnetic plunger 21 in the driving direction (the direction indicated by the arrow in the figure). And is arranged inside the main body 1 by setting a positional relationship so that the shock absorber 22 can give an impact to the side surface of the container 3 when the electromagnetic plunger 21 is driven. What That.

  When the vibration means 18 using the electromagnetic plunger 21 is mounted on an actual device, it is output from the light receiving element 11 when the shock absorber 22 applies an impact to the side surface of the container 3 by driving the electromagnetic plunger 21. The impact sound recognized by the user when the shock absorber 22 comes into contact with the container 3 with the minimum fluctuation that can determine the presence or absence of the liquid 4 inside the container 3 from the fluctuation of the electrical signal. The driving force and the softness of the shock absorber 22 are adjusted so as not to occur.

  According to such a configuration, the vibration means 18 that vibrates the container 3 from the outside of the container 3 is arranged and provided inside the main body 1 so that the container 3 can be vibrated by the vibration means 18. Since the liquid level 4a of the liquid 4 stored inside the container 3 can be made to fluctuate, the container 3 can be moved by the vibration means 18 even in an apparatus having a configuration in which no waves or fluctuations occur on the liquid level 4a of the liquid 4. The presence / absence of the liquid 4 inside the container 3 can be detected by judging the fluctuation of the electric signal output from the light receiving element 11 in the vibrated state.

  Further, as shown in FIG. 9, the air blowing means 23 that causes the liquid level 4 a to fluctuate by blowing air from above the liquid 4 outside the container 3 is also provided inside the main body 1. Thus, even if the configuration is such that the fluctuation of the electric signal output from the light receiving element 11 is judged in a state where the liquid surface 4a of the liquid 4 held inside the container 3 is shaken by the air blown from the air blowing means 23, the liquid 4 The presence or absence of the liquid 4 inside the container 3 can be detected even in an apparatus having a configuration in which no wave or fluctuation occurs on the liquid level 4a.

  Here, for example, as shown in the enlarged view of the air blowing means 23 in FIG. 10, the air blowing means 23 is configured by a general electric air blowing device that blows air by rotating the impeller 24 by the electric motor 25. In combination, as shown by the arrow line in the figure, the nozzle 26 is directed to the wind blowout port in the direction of the interior of the container 3 so that the direction of the air flow is directed to the direction of the liquid 4 inside the container 3. Is provided and arranged.

  In mounting the air blowing means 23 on an actual device, the liquid surface 4a is given the minimum fluctuation that can determine the presence or absence of the liquid 4 inside the container 3, and the air is blown to the extent that the sound is not recognized by the user. The air volume is adjusted to the minimum.

  According to such a configuration, the air blowing means 23 that causes the liquid surface 4a to fluctuate by blowing from above the liquid 4 outside the container 3 inside the main body 1 is also arranged and provided. Since the air level from the air blowing means 23 can cause fluctuations in the liquid level 4a of the liquid 4 stored in the container 3, even in a device having a configuration in which no waves or fluctuations occur in the liquid level 4a of the liquid 4. The liquid 4 inside the container 3 is determined by judging the fluctuation of the electric signal output from the light receiving element 11 in the state where the liquid level 4a of the liquid 4 held inside the container 3 is fluctuated by the blowing by the blowing means 23. It is possible to detect the presence or absence of.

(Embodiment 2)
In FIG. 11, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the present embodiment, in the electrical device in which the container 3 is detachable from the main body 1 with respect to the configuration of the first embodiment, the container 3 is mounted on the main body 1 as shown in the configuration diagram of FIG. , A light reflecting means 27 for efficiently reflecting light is fixed to the surface of the main body 1 at a position opposite to the light irradiation direction of the light emitting element 10 provided in the liquid detecting means 9 on the lower surface side of the container 3. They are also prepared and configured.

  The light reflecting means 27 directly reflects the light emitted from the light emitting element 10 on the surface thereof, and when the reflected light is received by the light receiving element 11, the light reflecting element 11 receives the inner surface of the container 3 from the light receiving element 11. In addition, the light reflection characteristics are adjusted so that an electric signal having a maximum value exceeding the value when the light reflected by the liquid surface 4e of the liquid 4 inside the container 3 is received is output. .

  Here, the light reflecting means 27 has a light reflecting surface property in which the light reflecting property is highly efficient with respect to the inner surface of the container 3 and the liquid surface 4a of the liquid 4 and does not reflect in one direction. For example, a white or grayish white color material is applied or colored, or a resin material such as ABS or PPS which is a base color itself is formed into a sheet shape and has a grainy surface. High light by finely pulverizing general glass materials mainly composed of transparent silicon dioxide with fine irregularities and dispersing them in liquefied acrylic or polyurethane transparent resin materials with a solvent. A reflective coating material is applied to the surface of a sheet-like resin material or metal material.

  The light reflecting means 27 can be configured by directly coating the surface of the target portion of the main body 1 with the above-mentioned coating material instead of fixing another material to the target portion of the main body 1.

  It should be noted that the portion illuminated by the light emitted from the light emitting element 10 inside the container 3 is a constituent material of a gray or black color so as to reduce the light reflectance with respect to the expression of the light reflecting means 27, or By applying the surface coating, it can be configured such that a large difference is caused by the amount of reflected light with respect to the light receiving element 11 before and after the container 3 is removed from the main body 1.

  Next, according to FIG. 12, the container 3 from the main body 1 is removed from the state of the electrical signal output from the light reflecting means 27 in the configuration in which the container 3 is detachable from the main body 1 and the light reflecting means 27 is provided. A method for determining this will be described.

  FIG. 12 shows the electric signal output from the light receiving element 11 as 0 V when light is emitted by intermittently turning off and turning on the light emitting element 10 according to the circuit configuration described in FIG. By representing the waveform 17e and the waveform f as the vertical axis in the range of 5V to 5V, the change of the electric signal is shown in the state of temporal transition.

  As described so far, when the light receiving element 11 has the liquid 4 inside the container 3 and the drive mechanism 2 is operating, an electrical signal with fluctuation as shown by a solid line in the waveform 17e is generated. In the state where the drive mechanism 2 is not operating or the state where the liquid 4 is not present in the container 3, an electrical signal without fluctuation as shown by the dotted line in the waveform 17e is output. Become.

Here, when the container 3 is detached from the main body 1, the surface of the main body 1 at a position opposite to the light irradiation direction of the light emitting element 10 has light reflection characteristics that have high light reflection characteristics with respect to the inner surface of the container 3 and the liquid surface 4 e. Since the means 27 is arranged, the light receiving element 11 is accompanied by fluctuations as shown by the waveform 17f with respect to the state in which the container 3 is mounted on the main body 1 and the state in which the liquid 4 is present inside the container 3. Therefore, an electric signal having a high voltage value is output.

  In mounting on an actual device, the electric signal output from the light receiving element 11 is applied to the main body 1 with respect to the state in which the container 3 is mounted on the main body 1 or the liquid 4 is present inside the container 3. When the light reflected by the light reflecting means 27 with the container 3 removed is received, the circuit element is set so that the difference is as large as possible and becomes the maximum value, and the light reflecting means 27 is adjusted while actually confirming the configuration (light reflection characteristics) in the target device. For example, in the circuit configuration described with reference to FIG. It is desirable to adjust the electrical signal in the state where the liquid 4 is present to 1.5 times to 2 times or more.

  Further, by adjusting as described above, the maximum electric signal output from the light receiving element 11 when the light reflected by the light reflecting means 27 is received by the light receiving element 11 is grasped, and this maximum If the value is defined in advance as the determination threshold value Vm as shown in the figure, the electric signal output from the light receiving element 11 is compared with the determination threshold value Vm, and then output from the light receiving element 11. If the electric signal is equal to or greater than the determination threshold value Vm, it can be determined that the light receiving element 11 is receiving the light reflected by the light reflecting means 27 at this time.

  Thus, if the electrical signal output from the light receiving element 11 is equal to or greater than the determination threshold value Vm, it can be determined that the light receiving element 11 is receiving the light reflected by the light reflecting means 27 at this time. This means that there is no object having light reflection characteristics inferior to that of the light reflecting means 27 between the light emitting element 10 and the light reflecting means 27, that is, the container 3 has been removed from the main body 1. It will be possible to judge.

  Note that when the light reflected by the light reflecting means 27 is received by the light receiving element 11, the electrical signal output from the light receiving element 11 is also different in brightness around the device, and dust adheres to the surface of the light reflecting means 27. 12 varies slightly in the long-term use due to the influence of the change in the light reflection characteristics due to the above. Therefore, in mounting on an actual device, a value lower than the determination threshold value Vm described above is shown by a one-dot chain line in FIG. An actual determination threshold value Va for attaching and detaching the container 3 is set to an intermediate position between the waveform 17f and the waveform 17e as shown, and it is confirmed that the output voltage from the light receiving element 11 exceeds the actual determination threshold value Va. By doing so, it is possible to determine the removal of the container 3 from the main body 1 which is more stable for a longer period of time.

  Further, when the light reflected by the light reflecting means 27 is received by the light receiving element 11, an electric signal without fluctuation is output from the light receiving element 11, and therefore, from the light receiving element 11 with respect to the actual determination threshold value Va. If it is confirmed that the output voltage does not change during the determination time ta described in the first embodiment, the removal of the container 3 from the main body 1 can be determined more stably.

According to such a configuration, in the electrical apparatus in which the container 3 is detachable from the main body 1, the main body 1 at a position facing the light irradiation direction of the light emitting element 10 provided in the liquid detection means 9 on the lower surface side of the container 3. When the light irradiated from the light emitting element 10 is directly reflected on the surface, a light reflecting means 27 is provided to generate light reflecting the electric signal output from the light receiving element 11 as a maximum value. The electric signal output from the light receiving element 11 when the light emitted from the light emitting element 10 is directly reflected by the means 27 is set as a maximum value, and the actual determination threshold value Va is determined in advance based on this value. If the value of the electrical signal output from the element 11 exceeds the actual determination threshold value Va for the determination time ta, it is determined that the container 3 has been removed from the main body 1. Inside of 3 And detecting the presence or absence of the liquid 4, Ru can be detected or removal of the container 3 from the main body 1 to fit.

(Embodiment 3)
In FIG. 13, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In this embodiment, in the electrical device in which the container 3 is detachable from the main body 1 with respect to the configuration of the first embodiment, the container 3 is mounted on the main body 1 as shown in the configuration diagram of FIG. The light absorbing means 28 for suppressing light reflection by absorbing light on the surface of the main body 1 at a position opposite to the light irradiation direction of the light emitting element 10 provided in the liquid detecting means 9 on the lower surface side of the container 3. It is configured to be fixed and prepared.

  The light absorbing means 28 directly reflects the light emitted from the light emitting element 10 on its surface, and when the reflected light is received by the light receiving element 11, the light receiving element 11 receives the reflected light from the inner surface of the container 3. In addition, the light reflection characteristics are adjusted so that an electric signal having a minimum value lower than a value when light reflected by the liquid surface 4e of the liquid 4 inside the container 3 is received is output.

  Here, the light absorbing means 28 is made of a material having a light reflecting surface property that has a sufficiently large light absorption rate with respect to the inner surface of the container 3 and the liquid surface 4a of the liquid 4 and hardly reflects incident light. For example, a black coating of a black body fine particle base material such as carbon black is applied or colored, or a resin material such as ABS or PPS in which a black body fine particle base material such as carbon black is dispersed in the base material is in a sheet form A glass material with fine grainy irregularities formed on the surface, or a general glass material mainly composed of transparent silicon dioxide, is made into fine particles, and acrylic or polyurethane-based transparent resin material is used with a solvent. It is configured by coating a surface of a sheet-like resin material or metal material with a coating material having high light reflection by dispersing in a liquefied material.

  In addition, the light absorption means 28 can also be comprised by coating the said coating material directly on the surface of the object site | part of the main body 1 instead of fixing another material to the object site | part of the main body 1. FIG.

  Note that the portion illuminated by the light emitted from the light emitting element 10 inside the container 3 is a white color component or surface so as to have a high light reflectance with respect to the light absorbing means 28. By applying the coating, it may be configured such that a large difference is caused by the amount of reflected light with respect to the light receiving element 11 before and after the container 3 is removed from the main body 1.

  Next, referring to FIG. 14, it is determined whether the container 3 is detached from the main body 1 from the state of the electrical signal output from the light emitting element 10 in the configuration in which the light absorbing means 28 is provided in a device in which the container 3 is removable from the main body 1. How to do will be described.

  FIG. 14 shows the electric signal output from the light receiving element 11 as 0 V when the horizontal axis is the time axis and the light emitting element 10 is turned off and turned on intermittently according to the circuit configuration described in FIG. By representing the waveform 17g and the waveform h as the vertical axis in the range of 5V to 5V, the change of the electric signal is shown in a state of temporal transition.

  As described so far, in the state where the liquid 4 is present inside the container 3 from the light receiving element 11 and the driving mechanism 2 is operating, an electric signal with fluctuation as shown by a solid line in the waveform 17g is generated. In the state where the drive mechanism 2 is not operated or the liquid 3 is not present in the container 3, an electrical signal without fluctuation as shown by the dotted line in the waveform 17g is output. Become.

Here, when the container 3 is detached from the main body 1, the surface of the main body 1 at a position opposite to the light irradiation direction of the light emitting element 10 is provided with a light reflection characteristic that absorbs light with respect to the inner surface of the container 3 and the liquid surface 4 e. Since the light absorbing means 28 is disposed, the light receiving element 11 shows a state in which the container 3 is mounted on the main body 1 and a state in which the liquid 4 is present inside the container 3 as indicated by a waveform 17h. An electric signal with no fluctuation and a low voltage value is output.

  In mounting on an actual device, the electric signal output from the light receiving element 11 is applied to the main body 1 with respect to the state in which the container 3 is mounted on the main body 1 or the liquid 4 is present inside the container 3. The circuit elements are set so that the difference is as large as possible when receiving the light reflected by the light absorbing means 28 in the state where the container 3 is removed from the container 3, and the circuit element is set to the minimum value. 28 is adjusted while actually confirming the configuration (light reflection characteristics) in the target device. For example, in the circuit configuration described with reference to FIG. It is desirable to adjust the electric signal in the state where the liquid 4 is present to 0.6 times to 0.5 times or less.

  Further, by adjusting as described above, an electric signal that is the minimum value output from the light receiving element 11 when the light reflected by the light absorbing means 28 is received by the light receiving element 11 is grasped, and this minimum If the value is defined in advance as the determination threshold value Vn as shown in the figure, the electric signal output from the light receiving element 11 is compared with the determination threshold value Vn, and then output from the light receiving element 11. If the electrical signal is equal to or less than the determination threshold value Vn, it can be determined that the light receiving element 11 is receiving the light reflected by the light absorbing means 28 at this time.

  As described above, if the electrical signal output from the light receiving element 11 is equal to or greater than the determination threshold value Vm, it can be determined that the light receiving element 11 is receiving the light reflected by the light absorbing means 28 at this time. This means that there is no object having light reflection characteristics inferior to that of the light absorbing means 28 between the light emitting element 10 and the light absorbing means 28, that is, the container 3 has been removed from the main body 1. It will be possible to judge.

  It should be noted that when the light reflected by the light absorbing means 28 is received by the light receiving element 11, the electrical signal output from the light receiving element 11 is also different in brightness around the device, and dust adheres to the surface of the light absorbing means 28. Because of the influence of the change in the light reflection characteristics due to the above, it will fluctuate somewhat in long-term use. Therefore, in mounting on an actual device, a value higher than the determination threshold value Vn described above is indicated by a one-dot chain line in FIG. An actual determination threshold value Vb for attaching and detaching the container 3 is set to an intermediate position between the waveform 17g and the waveform 17h as shown, and it is confirmed that the output voltage from the light receiving element 11 exceeds the actual determination threshold value Vb. By doing so, it is possible to determine the removal of the container 3 from the main body 1 which is more stable for a longer period of time.

  Further, when the light reflected by the light absorbing means 28 is received by the light receiving element 11, an electric signal without fluctuation is output from the light receiving element 11, so that the light receiving element 11 with respect to the actual determination threshold value Vb is output. If it is confirmed that the output voltage does not change during the determination time ta described in the first embodiment, the removal of the container 3 from the main body 1 can be determined more stably.

According to such a configuration, in the electrical apparatus in which the container 3 is detachable from the main body 1, the main body 1 at a position facing the light irradiation direction of the light emitting element 10 provided in the liquid detection means 9 on the lower surface side of the container 3. When the light irradiated from the light emitting element 10 is directly reflected on the surface, a light absorbing means 28 is provided to cause reflection of light with the electric signal output from the light receiving element 11 having the minimum value. The electric signal output from the light receiving element 11 when the light emitted from the light emitting element 10 is directly reflected by the means 28 is set as a minimum value, and an actual determination threshold value Vb is determined in advance based on this value. If the value of the electric signal output from the element 11 does not exceed the actual determination threshold value Vb for the determination time ta, it is determined that the container 3 has been removed from the main body 1. Of 3 And detecting the presence or absence of the liquid 4, Ru can be detected or removal of the container 3 from the main body 1 to fit.

The non-contact liquid detection device according to the present invention does not need to limit the components of the container, and also uses electricity that uses various liquids including equipment that may cause contamination in the portion that directly contacts the liquid inside the container. Since it is possible to detect the presence or absence of liquid inside the container in a non-contact manner over a long period of time in equipment, humidifiers and dehumidifiers used in general households, or electrical equipment that uses all liquids, including those for business use It is useful as a non-contact liquid detection device .

DESCRIPTION OF SYMBOLS 1 Main body 2 Drive mechanism 3 Container 9 Liquid detection means 10 Light emitting element 11 Light receiving element 12 Light shielding means ta Determination time 18 Excitation means 23 Blower means 27 Light reflection means 28 Light absorption means

Claims (7)

  1. Inside the main body constituting an outer shell of the device, comprising a drive moving mechanism, a container having a space therein,
    In the electric device providing a unique functionality while maintaining the liquid inside the container,
    And a light emission element and a light receiving element inside the body,
    The light receiving direction of the irradiation direction and the light receiving element of the light emitting element is a same direction, directs toward the surface of the liquid inside the upper direction of the container,
    The light irradiated from the light emitting element receives the light reflected by the light receiving element,
    To operate the drive mechanism, and fluctuation occurs in the surface of the liquid, during the determination time value of the electric signal output from the light receiving element is defined in advance, the liquid is present in the interior of the container when the fluctuating contactless liquid detection device determine.
  2. 2. The non- light-shielding device according to claim 1 , wherein a light shielding unit is disposed with respect to the light receiving element so as to transmit only light from the surface direction of the liquid inside the container and to block incidence of light from other than the surface direction of the liquid. Contact liquid detection device .
  3. Wherein by intermittently the turning on and off of the light emitting element, the lighting and extinguishing of the light emitting device by obtaining the difference between the electric signal output from the light receiving element when to turn off the time that turns on the light-emitting device due to the influence of ambient light of the device regardless exclude the electric signal output from the light receiving element,
    During the determination time value of the difference of the electric signal is defined in advance, the non-contact liquid detection device according to Motomeko 1 or 2 you determine that liquid is present in the interior of the container when the fluctuating.
  4. The non-contact liquid detection apparatus according to claim 1 , wherein the drive mechanism is a vibration unit that vibrates the container from the outside of the container .
  5. The non-contact liquid detection device according to claim 1 , wherein the driving mechanism is a blowing unit that blows air toward the inside of the container.
  6. The container is attachable and detachable relative to the body,
    The main body has a light reflection on the lower surface side of the mounting location of the container, facing the irradiation direction of the light emitting element.
    Equipped with shooting means,
    Said directly reflected light irradiated from the light-emitting element, previously defined as an electrical signal to determine the constant threshold output from the light receiving elements receiving light reflected,
    During the determination time value of the electric signal output from the light receiving element by emitting the light emitting element is defined in advance, according to claim 1 for determining that the container has been removed from the body as long as the determination threshold value or more The non-contact liquid detection device according to any one of?
  7. The container is detachable from the main body ,
    The main body is provided with light absorbing means on the lower surface side of the mounting position of the container so as to face the irradiation direction of the light emitting element,
    The light emitted from the light emitting element is directly reflected, and an electrical signal output from the light receiving element that receives the reflected light is defined in advance as a determination threshold,
    During the determination time value of the electric signal output from the light receiving element by emitting the light emitting element is defined in advance, according to claim 1 for determining that the container is detached from the body if the following values of the determination threshold value The non-contact liquid detection device according to any one of?
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JPH05248924A (en) * 1992-03-09 1993-09-28 Omron Corp Liquid level detector
JPH0669276A (en) * 1992-05-22 1994-03-11 Nec Corp Semiconductor device
JPH09322481A (en) * 1996-05-31 1997-12-12 Toshiba Corp Water leakage detector of water-cooled dynamo-electric machine
JP2000186952A (en) * 1998-12-22 2000-07-04 Atsushi Tominaga Liquid level detector
JP2001153800A (en) * 1999-11-25 2001-06-08 Hitachi Ltd Oil film-detecting apparatus
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