KR20170097430A - Sensor Module For Continuous Detection And Method Of Driving The Same - Google Patents

Abstract

The present invention provides a sensor module for continuous detection which minimizes malfunction by noise. The sensor module for continuous detection comprises: a sensor unit including a sensor to detect an infrared ray of a heat source to output a detection signal, a sensor power unit to block or transfer sensor power to the sensor, a sensor output control unit to transfer or block the detection signal, a lens to enclose the sensor on a front and focus the infrared ray, and a distance changing means arranged on a lower portion of the lens to vertically move the sensor or the lens to selectively change a separation distance between the sensor and the lens; an amplification unit to amplify the detection signal to output the detection signal; and a drive unit to control the distance changing means, the sensor power unit, and the sensor output control unit in accordance with a vibration signal corresponding to the amplified detection signal.

Description

[0001] The present invention relates to a continuous sensor module and a method of driving the same,

The present invention relates to a continuous sensor module, and more particularly, to a continuous sensor module that changes a distance between a sensor and a lens of a continuous sensor module and controls power and output of the sensor immediately after a change in the distance, To a continuous sensor module capable of continuously detecting infrared rays emitted from a heat source by changing a sensing point in a minimized state, and a driving method thereof.

A pyroelectric infrared sensor (PIR) sensor is a sensor that senses the temperature change of an object by absorbing the radiant energy of the infrared ray by using the whole body.

The superconductors are characterized in that the electric polarization amount of the dielectric crystal changes according to the temperature change to generate a voltage.

That is, the superalloy having the spontaneous polarization in the thermal equilibrium state maintains the electrical neutrality by the surface charge. At this time, when the temperature of the superalloy is increased due to the incident of the infrared energy, the spontaneous polarization amount decreases in proportion to the temperature , So that part of the surface charge becomes free charge.

This free charge passes through the high impedance load and disappears. When a voltmeter is connected to both ends of the high impedance load, a voltage proportional to the amount of free charge flowing is detected.

A person or an animal generates infrared energy in the form of infrared rays of 7 to 14 mu m, and the superconductor generates a voltage in accordance with the sensed temperature change to check presence or absence of the object.

The principle of operation of such a pyroelectric infrared sensor will be described with reference to the drawings.

FIG. 1 is a diagram showing a conventional pyroelectric infrared sensor and a sensing signal. When a heat source such as a person or an animal moves, a change in thermal energy of an infrared ray emitted from a heat source due to a change in sensing point of the sensor appears as a voltage change Respectively.

As shown in FIG. 1, the pyroelectric infrared sensor 22 is composed of a super-element capable of sensing infrared rays.

When a heat source (HS) such as a person or an animal does not pass, the pyroelectric infrared sensor 22 senses the same amount of natural infrared light present in the atmosphere.

When the heat source HS enters the sensing area DA along the first direction X1, a positive differential change is generated in the pyroelectric infrared sensor 22, Subsequently, when the sensing area DA is detached along the first direction X1, a negative (-) differential change occurs in the pyroelectric infrared sensor 22.

These positive and negative differential changes are represented by a sense signal SS having positive and negative pulses and can recognize the movement of the heat source HS from the pulse of the sense signal SS of the pyroelectric infrared sensor 22 .

Such a pyroelectric infrared sensor is applied to an automatic lighting device such as a door or an entrance of an elevator, and will be described with reference to the drawings.

2 is a block diagram showing a conventional pyroelectric infrared sensor module.

2, the conventional pyroelectric infrared sensor module 10 includes a sensor unit 20, an amplification unit 30, a lamp control unit 40, and a lamp 50. As shown in FIG.

The sensor unit 20 includes a pyroelectric infrared sensor (not shown) and a lens (not shown) disposed in front of the pyroelectric infrared sensor. The sensor unit 20 senses thermal energy of a heat source such as a person or an animal, As shown in FIG.

The amplification unit 30 amplifies the sensing signal of the sensor unit 20 to an analytical level and transmits the amplified signal to the control unit 40.

The light control unit 40 determines the level of the amplified sensing signal, and outputs a lighting signal when the amplified sensing signal is at a high level, thereby lighting the electric lamp 50. [

The lamp 50 is turned on for a predetermined time in response to the lighting signal. The lamp holding time at which the lamp 50 is turned on is determined by the capacity of the capacitor (not shown) of the lamp control unit 40, 30 seconds.

Such conventional pyroelectric infrared sensor modules are applied to automatic lights, automatic opening and closing of doors, automatic water supply devices, intrusion alarms, various gas detectors using infrared absorption, toxic gas alarms, and fire alarms.

However, since the conventional pyroelectric infrared sensor module detects only the transient first one time temperature change, there is a problem that after the first heat source is detected, no further detection signal is generated when there is no movement even though the heat source continues to exist have.

For example, in the case of an automatic light such as an entrance hall, a public restroom, a hallway, etc. where a conventional pyroelectric infrared sensor module is applied, a light is turned on by detecting the entrance of a person at an early stage, There is a problem that the lamp is turned off after a certain period of time.

In order to solve such a problem, a pyroelectric infrared sensor module to which a human-recognized human sensor is applied has been developed. In such a pyroelectric infrared sensor module, a human sensor detects the presence of a person, When it disappears, the light is turned off.

For example, a human body detection function may be implemented by adding a Doppler radar function to a pyroelectric infrared sensor module, a human body detection function may be implemented by adding a proximity sensor function to a pyroelectric infrared sensor module, In some cases, a human body detection function is implemented by forming an array of sensors.

However, the pyroelectric infrared sensor module to which the human body sensor is applied has a problem in that it is difficult to expand the market because the unit price is higher than the power saving effect.

In addition, a pyroelectric infrared sensor module using a blocking portion in front of the sensor has been proposed. In such a pyroelectric infrared sensor module, a person enters a sensing region and then selectively passes infrared rays by a blocking portion, When it disappears, the light is turned off.

However, in the pyroelectric infrared sensor module using the blocking unit at the front of the sensor, since the infrared rays of the blocking unit are incident on the sensor while the blocking unit blocks the infrared rays of the sensing area, a malfunction occurs due to the difference between the temperature of the sensing area and the temperature of the blocking unit there is a problem.

In addition, a pyroelectric infrared sensor module for vertically or horizontally moving a sensor or a path changing means in front of a sensor using a driving body or moving a sensor or a lens vertically or horizontally has been proposed. In such a pyroelectric infrared sensor module, After entering the area, the sensor, the lens or the path changing means is moved by the driving body so that the infrared light is selectively focused on the sensor so that the lamp is turned on while the person is present and the lamp is turned off when the person disappears.

However, in the pyroelectric infrared sensor module using the driving body, noise is generated in the sensing signal of the sensor due to the operation of the driving body, and accordingly, the sensor malfunctions.

FIG. 3 is a diagram showing a detection signal of a pyroelectric infrared sensor module using a conventional driving body.

As shown in Fig. 3, in the pyroelectric infrared sensor module using the driving body, the driving body is moved during the driving body ON period in which the vibration signal transmitted to the driving body is at the high level to move the sensor or the lens, During the OFF period of the actuator in which the vibration signal is low level, the sensor or the lens stops and the infrared ray is detected.

At this time, the sensor continuously detects the infrared ray and outputs the detection signal. However, due to the operation of the driving body, noise may be generated in the sensing signal of the sensor at the beginning of the OFF period of the driving body.

In particular, when the ambient temperature difference is relatively large, such as during a summer window or air conditioner having a high temperature or around a heater of a winter having a low temperature, noise caused by the operation of the driving body may be relatively large, There is a problem that a noise is recognized as a person's presence and a malfunction occurs in which the lamp is turned on.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide an infrared ray sensor which changes the focal point of infrared rays incident on a sensor by periodically changing the distance between the sensor and the lens, The present invention also provides a continuous sensor module and a method of driving the same.

By using the distance changing means to periodically vibrate the sensor or the lens of the combustion sensor module and to control the power and output of the sensor immediately after the vibration, the noise of the sensing signal is prevented and the malfunction due to noise is minimized Another object of the present invention is to provide a continuous sensor module and a method of driving the same that can continuously detect infrared rays emitted from a heat source by changing a detection point.

According to an aspect of the present invention, there is provided an infrared sensor comprising: a sensor for sensing an infrared ray of a heat source to output a sensing signal; a sensor power source for transmitting or blocking a sensor power to the sensor; A distance changing means for selectively changing a distance between the sensor and the lens by vertically moving the sensor or the lens disposed below the lens to surround the sensor in front of the lens, A sensor unit including a sensor unit; An amplifying unit for amplifying and outputting the sensing signal; And a driving unit for controlling the distance changing unit, the sensor power unit, and the sensor output control unit according to the vibration signal corresponding to the amplified sensing signal.

The sensor or the lens periodically vibrates under the control of the driving unit. After the vibration of the sensor or the lens is stopped, the sensor power unit sequentially blocks and transmits the sensor power according to the control of the driving unit. After the sensor power is sequentially intercepted and transmitted, the sensor output control unit may sequentially block and supply the detection signal to the amplification unit under the control of the driving unit.

The driving unit may include: a driving control unit for outputting an ON signal and an OFF signal corresponding to vibration and stop of the sensor or the lens, respectively, in accordance with the amplified sensing signal; And an oscillator for outputting the vibration signal corresponding to the ON signal, wherein the distance changing means is controlled by the ON signal, and the sensor power section and the sensor output control section can be controlled by the OFF signal have.

According to another aspect of the present invention, there is provided a method of detecting an infrared ray, comprising the steps of: detecting a infrared ray and outputting a detection signal when the sensor or the lens is located at a normal point; Amplifying the sensing signal; Determining a level of the sensing signal amplified by the driving unit; If the amplified detection signal has a low level, the driving unit sequentially turns on and off the driving unit of the distance changing unit; And a step of sequentially shutting off and transmitting the sensor power to the sensor by the sensor power unit under the control of the driving unit.

The driving method of the continuous sensing sensor module may further include a step of sequentially intercepting and transmitting the sensing signal to the amplifying unit by the sensor output control unit under the control of the driving unit.

The step of sequentially turning on and off the driving unit of the distance changing unit is periodically repeated until the driving unit interrupts and transmits the sensor power by the sensor power unit and the interception and transmission of the sensing signal by the sensor output control unit. The cutoff and transmission may be performed during a section that is 50% or less of the OFF section of the driving body.

As described above, the continuous sensor module and the method of driving the same according to the present invention change the distance between the sensor and the lens periodically by the distance changing means, thereby changing the focus of the infrared ray incident on the sensor, So that the infrared ray emitted from the heat source can be continuously detected.

By using the distance changing means to periodically vibrate the sensor or the lens of the combustion sensor module and to control the power and output of the sensor immediately after the vibration, the noise of the sensing signal is prevented and the malfunction due to noise is minimized It is possible to continuously detect the infrared rays emitted from the heat source by changing the detection point.

1 is a view showing a conventional pyroelectric infrared sensor and a detection signal.
2 is a block diagram showing a conventional pyroelectric infrared sensor module.
3 is a diagram showing a detection signal of a pyroelectric infrared sensor module using a conventional driving body.
4 is a perspective view illustrating a continuous sensing sensor module according to an embodiment of the present invention.
5 is a block diagram illustrating a continuous sensing sensor module according to an embodiment of the present invention.
6A and 6B are sectional views showing the operation of the continuous sensing sensor module according to the embodiment of the present invention, respectively.
7 is a flowchart illustrating a method of driving a continuous sensing sensor module according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

4 and 5 are a perspective view and a block diagram respectively showing a continuous sensing sensor module according to an embodiment of the present invention.

4, the continuous sensor module 110 according to the embodiment of the present invention includes a sensor 122, a lens 124 for covering the sensor 122 from the front, And first and second permanent magnets 128a and 128b disposed on the upper and lower portions of the distance changing means 126, respectively.

The sensor 122 may be a pyroelectric infrared sensor capable of sensing thermal energy in the form of infrared rays emitted from a heat source such as a person or an animal and can recognize the movement of a heat source from a sensing signal according to a variation of thermal energy.

The lens 122 may be a hemispherical Fresnel lens or window and focuses the infrared light from the heat source at a predetermined focal distance and transmits it to the sensor 122 to magnify the sensing distance of the sensor 122, And also serves to prevent malfunction of the sensor 122 by blocking air flow or natural light outside the continuous sensor module 110.

The lens 126 may be made of a flexible plastic material such as polymethylmethacrylate (PMMA), polyvinylchloride (PVC), or polycarbonate (PC).

The distance changing means 126 changes the distance between the sensor 122 and the lens 124 and changes the focus of the infrared light incident on the sensor 122 by periodically moving the sensor 122 in the vertical direction The distance changing means 126 may be coupled to the back surface of the sensor 122 for this purpose.

The distance changing means 126 may include a driving body 126a, a driving shaft 126b and an elastic body 126c. The driving body 126a and the elastic body 126c respectively change the position of the driving shaft 126b And the driving shaft 126b can be inserted into the driving body 126a or protruded from the driving body 126a and coupled to the sensor 122 by a driving force and an elastic force.

For example, the actuator 126a may be a pneumatic actuator, a hydraulic actuator, an electric actuator (motor), an actuator using a piezoelectric element, a solenoid, a relay, a spring, or the like.

When the actuator 126a is a solenoid, the first and second permanent magnets 128a and 128b may be disposed on the upper and lower portions of the actuator 126a. The magnetic flux direction of the solenoid And the first and second permanent magnets 128a and 128b are made to have the same magnetic flux direction so that attraction force and repulsion force can be generated between the solenoid and the first and second permanent magnets 128a and 128b, By using the repulsive force for the expansion and contraction of the drive shaft 126b, the power consumption of the solenoid which is the drive body 126a can be reduced.

For example, when the driving shaft 126b is inserted into the driving body 126a, when the magnetic flux of the solenoid is generated so that the upper and lower portions of the solenoid are N poles and S poles, respectively, the first and second permanent magnets 128a And 128b may be arranged such that the upper and lower portions thereof are N-pole and S-pole, respectively.

The first and second permanent magnets 128a and 128b may be omitted in other embodiments in which an actuator other than the solenoid, a relay, or the like is used as the actuator 126a.

When the driving body 126a is made of an electric actuator (motor), a cam (cam) rotated by a motor can be disposed at the center of the driving body 126a to expand and contract the driving shaft 126b.

Although not shown, the sensor 122 may be mounted on a circuit board such as a printed circuit board (PCB) and the drive shaft 126b may be coupled to a circuit board. In addition to the sensor 122, A plurality of electric elements for analyzing the sensing signal of the sensor 122 and for flashing the electric lamp and for driving the driving body 126a may be mounted.

5, the continuous detection sensor module 110 includes a sensor unit 120 for detecting infrared rays of a heat source and outputting a detection signal, An amplifying unit 130 for amplifying and outputting a sensing signal of the sensor unit 120, a flashing lamp unit 140 of the lamp 144 according to the amplified sensing signal of the amplifying unit 130, And a driving unit 150 for controlling the operation of the driving unit 158 and the sensor unit 120 according to the amplified sensing signal.

The sensor unit 120 includes a sensor power unit 121, a sensor 122, a sensor output control unit 123, a lens 124, and a distance changing unit 126.

The sensor power unit 121 does not transmit the power required for the operation of the sensor 122 to the sensor 122 or transmit the sensor power to the sensor 122 under the control of the driving unit 150.

The sensor 122 senses thermal energy in the infrared form of the heat source and outputs a sensing signal.

The sensor output control unit 123 supplies the sensor 130 with a sensor signal (sensor output) or cuts off the sensor output (sensor output) under the control of the driving unit 150.

The lens 124 focuses the infrared rays of the heat source at a predetermined focal distance and transmits the infrared light to the sensor 122. The focal distance can be determined by the refractive index and the curvature of the lens 124 or the like.

The distance changing means 126 changes the distance between the sensor 122 and the lens 124 by periodically moving the sensor 122 in the vertical direction so that the sensor 122 is moved to the focal distance of the lens 124 And is positioned at a departure point that is vertically offset from the corresponding normal point or the focal distance of the lens 124. [

For example, the distance changing means 126 may cause the sensor 122 to be positioned at a normal point corresponding to the focal distance before the heat source is detected, so that the infrared rays passing through the lens 124 are normally focused on the sensor 122 The sensor 122 may be moved in the vertical direction to be positioned at a departure point deviated from the focal distance so that the infrared rays passing through the lens 124 can not be normally focused on the sensor 122. [

When the sensor 122 is positioned at the normal position and the infrared rays passing through the lens 124 are normally focused on the sensor 122, the sensor 122 detects all the heat sources located at a certain distance (for example, about 3 mm) The sensor 122 is positioned at a distance (e.g., about 30 cm) when the sensor 122 is at the departure point and the infrared light passed through the lens 124 is not normally focused on the sensor 122 The heat source can not be detected.

Therefore, since the distance changing means 126 alternately and repeatedly positions the sensor 122 at the normal point and the departure point after the detection of the heat source, the infrared rays emitted by the stationary heat source in the sensing area are transmitted through the lens 124 122 so that the sensor 122 does not sense or sense the infrared radiation of the heat source, thereby detecting the infrared radiation emitted by the stationary heat source and recognizing the presence of the heat source.

When the sensor 122 does not detect a change in the infrared rays emitted by the heat source even though the sensor 122 is alternately and repeatedly positioned at the normal point and the departure point, the driving unit 150 causes the driving unit 158 to move to the distance changing unit 126, And the sensor 122 is again located at the normal point.

The amplification unit 130 includes an amplifier 132, a gain adjustment unit 134, and a delay unit 136.

The amplifier 132 may be an operational amplifier (OP AMP) and amplifies the detection signal of the sensor 122 to an analytical level according to a gain determined by the gain adjustment unit 134, (140) and the driving unit (150).

The gain adjusting unit 134 determines the gain of the amplifier 132 as one of the normal gain and the changing gain in accordance with the delayed driving signal output from the delay unit 136. [

For example, the gain adjuster 134 controls the amplifier 132 to have a first gain (normal gain) before the heat source is detected, and after the heat source is detected, the amplifier 132 according to the delayed drive signal of the delay unit 136, May have a second gain (change gain) smaller than the first gain.

If no heat source is sensed thereafter, the gain adjuster 134 may cause the amplifier 132 to again have the first gain.

The reason why the gain adjusting unit 134 changes the gain of the amplifier 132 is that the continuous detecting sensor module 110 may malfunction due to the vertical movement of the distance changing unit 126, So that the module 110 is insensitive to natural infrared rays in the surrounding area, thereby minimizing malfunction.

The delay unit 136 delays the driving signal outputted from the switch 154 of the driving unit 150 by a predetermined time and transmits the delayed signal to the gain adjusting unit 134. [

The driving signal of the switch 154 is a signal corresponding to the sensing signal according to the sensing of the heat source of the sensor 122. When the heat source leaves the sensing area before the lighting time of the lamp 144 is terminated after the heat source enters the sensing area, The delay unit 136 delays the drive signal of the switch 154 by a predetermined time and transfers the delayed signal to the gain adjustment unit 134. [

For example, the delay time of the delay unit 136 may be less than or equal to the lighting hold time of the lamp 144 in the range of 20 to 30 seconds.

The lamp unit 140 includes a lamp control unit 142 and a lamp 144.

The light control unit 142 determines the level of the amplified detection signal output from the amplifier 132. When the amplified detection signal has a high level as a result of the determination, the light control unit 142 outputs a lighting signal to light the lamp 144. [

The lamp 144 is turned on for a predetermined time in accordance with the lighting signal. The lighting holding time at which the lamp 144 is turned on is determined by the capacity of a capacitor (not shown) of the lamp control unit 142, 30 seconds.

The driving unit 150 includes a driving control unit 152, a switch 154, and an oscillator 156.

The drive control unit 152 determines the level of the amplified detection signal output from the amplifier 132 and outputs an ON signal when the amplified detection signal has a high level to be transmitted to the switch 154 And outputs an off signal to the sensor power supply unit 121 and the sensor output control unit 123 when the amplified detection signal has a low level.

The switch 154 outputs a drive signal in accordance with an ON signal output from the drive control unit 152 and transmits the drive signal to the oscillator 156 and the delay unit 136.

The oscillator 156 generates a vibration signal of a predetermined period according to the drive signal output from the switch 154 and transmits the vibration signal to the distance changing means 126.

The sensor power supply unit 121 of the sensor unit 120 does not transmit the sensor power to the sensor 122 according to the OFF signal of the drive control unit 152 of the drive unit 150 , And the sensor power is again transmitted to the sensor 122 (sensor power ON).

That is, by initializing the sensor 122 at the beginning of the drive body OFF period, it is possible to prevent the noise of the detection signal output from the sensor 122 and to prevent malfunction of the continuous detection sensor module 110 due to noise .

For example, the drive control unit 152 may be a micro controller or a microcomputer (MICOM), and may be provided at an initial stage of the actuator OFF period, Data can be stored.

On the other hand, when the sensor power is supplied again to the sensor 122, an initial pulse is generated in the detection signal irrespective of the presence or absence of a person. The continuous detection sensor module 110 may malfunction due to the start pulse .

The sensor output control unit 123 of the sensor unit 120 transmits the sensor power to the sensor 122 in response to the OFF signal of the drive control unit 152 of the drive unit 150, The detection signal of the sensor 122 is transmitted to the amplifier 132 of the amplification unit 130 after the sensor signal is not transmitted to the amplifier 132 of the amplification unit 130 (Sensor output supply).

That is, after the initialization of the sensor 122 at the beginning of the drive body OFF period, the start signal of the detection signal output from the sensor 122 is cut off by blocking the detection signal output from the sensor 122 for a predetermined time period And it is possible to prevent malfunction of the continuous detection sensor module 110 due to the start pulse.

At this time, OFF / ON of the sensor power and shutoff / supply of the sensor output may be performed during a period of 50% or less of the drive body OFF period, for example, for a time of about 0.5 seconds or less.

The amplifier 132, the gain adjusting unit 134, the delay unit 136, the lamp control unit 142, the drive control unit 152, the switch 154 and the oscillator 156 are connected to the circuit board And the lamp 144 may be electrically connected to the circuit board 160. The circuit board 160 may be electrically connected to the circuit board 160. [

Further, one device can be used as the lamp control unit 142 and the drive control unit 152.

4 and 5, the amplifying unit 130 includes an amplifier 132, a gain adjusting unit 134, and a delay unit 136. The driving unit 150 includes a driving control unit 152, a switch 154 The delay unit 136 and the switch 154 are omitted so that the amplification unit 130 is composed only of the amplifier 132 and the amplification unit 130 is composed of the amplification unit 130. In this case, (150) may be composed only of the drive control unit (152) and the oscillator (156).

4 and 5, the distance changing means 126 moves the sensor 122 in the vertical direction. However, in another embodiment, the distance changing means 126 moves the sensor 122 vertically The distance changing means 126 can move the lens 124 in the horizontal direction or the vertical direction. In this case also, after the operation of the distance changing means 126 is completed, It is possible to prevent the malfunction of the continuous detection sensor module 110 by removing the noise and the start pulse of the detection signal by sequentially performing OFF / ON of the sensor power and interception / supply of the sensor output.

The operation of the continuous sensor module 110 will be described with reference to the drawings.

FIGS. 6A and 6B are cross-sectional views illustrating the operation of the continuous sensing sensor module according to the embodiment of the present invention, and will be described with reference to FIGS. 4 and 5. FIG.

6A, before the heat source enters the sensing area of the continuous sensing sensor module 110, the driving body 126a of the distance changing unit 126 does not operate,

The drive shaft 126b is maintained in a stretched state and the sensor 122 coupled to the drive shaft 126b is located at a normal point corresponding to the focal length F of the lens 124. [

For example, the sensor 122 may be spaced a first distance d1 equal to the focal length F of the lens 124 from the lower surface of the lens 124, (IR) is normally focused and delivered to the sensor 122.

6B, after the heat source enters the sensing area of the continuous sensing sensor module 110, the driving body 126a of the distance changing unit 126 is operated first

The driving shaft 126b is inserted into the driving body 126a to be in a contracted state and the sensor 122 coupled to the driving shaft 126b is positioned at a deviation point out of the focal distance F of the lens 124. [

For example, the sensor 122 may be spaced apart from the lower surface of the lens 124 by a second distance d2 that is greater than the focal length F of the lens 122, (IR) is focused at a position vertically spaced from the sensor 122 and is not normally transmitted to the sensor 122, so that the sensor 122 can not detect the heat source.

At this time, the driving body 126a is formed of a solenoid, and the first and second permanent magnets 128a and 128b are disposed on the upper and lower portions of the driving body 126a, respectively, so that the driving force assisting the inserting operation of the driving shaft 126b And power consumption can be reduced.

After one predetermined period, as shown in Fig. 6A, the driving body 126a is operated again

The sensor 122 coupled to the driving shaft 126b is positioned at a normal point corresponding to the focal length F and the result is that the lens 124 is moved to the right, The infrared rays IR passing through the sensor 122 are focused and transmitted to the sensor 122 again, and the sensor 122 senses the heat source.

At this time, an elastic body 126c may be formed around the driving shaft 126b to provide an elastic force assisting the projecting motion of the driving shaft 126b.

After the heat source is separated from the sensing area of the continuous sensing sensor module 110, the continuous sensing sensor module 110 maintains the state shown in FIG. 6A.

The sensor 122 of the continuous sensing sensor module 110 is positioned at the normal point corresponding to the focal length F of the lens 124 by the distance changing means 126 before the heat source enters the sensing area The sensor 122 of the continuous sensing sensor module 110 is controlled by the distance changing unit 126 after the infrared source IR is normally focused and transmitted to the sensor 122, Since the infrared rays IR are regularly focused and transmitted to the sensor 122 or are not properly focused and transmitted to the sensor 122, the heat source in the sensing area does not move The continuous detection sensor module 110 can detect that the infrared ray emitted from the heat source changes.

Also, the sensor power is turned on and off sequentially by the sensor power supply unit 121 at the initial stage of detecting the infrared rays of the heat source again after the change of the detection point, and the sensor output is successively cut off by the sensor output control unit 123 Thus, the noise and the start pulse of the sensing signal are removed, and malfunction of the continuous sensing module 110 can be prevented.

Therefore, the continuous sensing sensor module 110 can sense the infrared rays of the heat source in the sensing area and can control the movement of the heat source and the movement of the heat source in a state where the malfunction caused by the driving body 126a of the distance changing unit 126 is minimized. The existence can be consecutively recognized.

6A and 6B, the drive shaft 126b protrudes and extends from the drive body 126a when the sensor 122 is positioned at the normal point, and the drive shaft 126b The driving shaft 126b is inserted into the driving body 126a to be contracted when the sensor 122 is positioned at the normal position and the sensor 122 The driving shaft 126b may protrude from the driving body 126a and be extended.

A driving method of the continuous sensing sensor module 110 will be described with reference to the drawings.

FIG. 7 is a flowchart for explaining a method of driving the continuous sensing sensor module according to an embodiment of the present invention, and will be described with reference to FIGS. 4 and 5. FIG.

7, when the power is applied, the operation of the continuous sensor module 110 is started (st10), and the sensor 122 senses infrared rays in a state where the sensor 122 is located at a normal point (st12 ).

The amplifier 132 of the amplifying unit 130 amplifies the sensing signal output from the sensor 122 to a first gain (st14), and amplifies the sensed signal output from the light control unit 142 and the driving unit 150 of the light unit 140 The drive control unit 152 determines the level of the amplified sense signal (st16).

When the detection signal has a low level, the lamp control unit 142 does not output a lighting signal and the lamp 144 is maintained in an unlit state and the driving control unit 152, the switch 154 and the oscillator 156 The drive shaft 126b is maintained in a contracted state, and the operation of the continuous sensor module 110 is terminated (st34).

As a result of the determination, when the detection signal has a high level, the lamp control unit 142 outputs a lighting signal and the lamp 144 is turned on (st18).

The gain control section 134 of the amplification section 130 outputs the ON signal, the drive signal and the vibration signal to the drive control section 152, the switch 154 and the oscillator 156, So that the first gain of the amplifier 132 is adjusted to be the second gain (st20).

Thereafter, the drive body 126a of the distance changing means 126 is turned on (st22) and the drive shaft 126b is contracted and extended according to the vibration signal of the oscillator 156, The shaft 126a is turned OFF (st24) and the shrinkage and extension of the drive shaft 126b are stopped.

Thereafter, in response to the OFF signal of the drive control unit 152, the sensor power supply unit 121 does not transmit the sensor power to the sensor 122 (sensor power OFF) (st26) (Sensor power ON) (st28).

Thereafter, the sensor output control unit 123 disconnects the sensing signal of the sensor 122 from the amplifier 132 (sensor output is interrupted) (st30) in accordance with the OFF signal of the drive control unit 152 (Sensor output supply) (st32).

Accordingly, after the heat source enters the sensing area, the sensor 122 moves from the normal point to the changing point by the operation of the driving body 126a of the distance changing means 126, The stationary heat source in the sensing area can be detected in a state where the sensor 122 turns on / off the sensor power and the sensor output 122 intercepts the infrared rays (st12) and the malfunction due to the noise and the start pulse is minimized.

The amplifier 132 amplifies the detection signal in a state where the first gain of the amplifier 132 is changed to the second gain by the adjustment of the gain adjusting unit 134 after a lapse of a predetermined delay time immediately after entering the sensing region of the heat source (st14), it is possible to minimize the malfunction due to the surrounding natural infrared rays.

As described above, in the continuous sensing sensor module and the driving method thereof according to the embodiment of the present invention, the sensor or the lens is periodically vibrated in the horizontal direction or the vertical direction by the distance changing means to change the focus of the infrared rays transmitted to the sensor So that the infrared rays emitted by the heat source can be detected to be changed, and as a result, the stationary heat source can be continuously detected.

After the vibration of the sensor or the lens by the driving means of the distance changing means, the sensor power is turned OFF / ON and the sensor output is interrupted / supplied at the beginning of the OFF period of the driving body, And as a result, malfunction of the continuous sensor module can be minimized.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that

110: continuous sensing sensor module 120: sensor unit
130: amplifying unit 140:
150:

Claims (6)

A sensor output unit for transmitting or intercepting the sensing signal; and a control unit for controlling the infrared sensor to surround the sensor in front of the infrared sensor, And a distance changing means disposed at a lower portion of the lens for selectively changing the distance between the sensor and the lens by moving the sensor or the lens in a vertical direction;
An amplifying unit for amplifying and outputting the sensing signal;
And a driving unit for controlling the distance changing unit, the sensor power supply unit, and the sensor output control unit according to the vibration signal corresponding to the amplified sensing signal,
And a sensor module.
The method according to claim 1,
The sensor or the lens periodically vibrates under the control of the driving unit,
After the vibration of the sensor or the lens is stopped, the sensor power unit sequentially intercepts and transmits the sensor power according to the control of the driving unit,
Wherein the sensor output control unit sequentially blocks and supplies the sensing signal to the amplifying unit under the control of the driving unit after the sensor power is sequentially intercepted and transmitted.
3. The method of claim 2,
The driving unit includes:
A drive controller for outputting an on signal and an off signal respectively corresponding to the vibration and the stop of the sensor or the lens according to the amplified detection signal;
An oscillator for outputting the oscillation signal corresponding to the ON signal;
Further comprising:
The distance changing means is controlled by the ON signal,
Wherein the sensor power unit and the sensor output control unit are controlled by the off signal.
Detecting the infrared ray and outputting a detection signal when the sensor or the lens is located at a normal position;
Amplifying the sensing signal;
Determining a level of the sensing signal amplified by the driving unit;
If the amplified detection signal has a low level, the driving unit sequentially turns on and off the driving unit of the distance changing unit;
And the sensor power unit sequentially blocks and transmits the sensor power to the sensor under the control of the driving unit
And a driving circuit for driving the continuous sensing sensor module.
5. The method of claim 4,
And the sensor output control unit sequentially intercepts and transmits the sensing signal to the amplifying unit under the control of the driving unit.
6. The method of claim 5,
The step of sequentially turning on and off the driving unit of the distance changing unit by the driving unit is repeated periodically,
Wherein the sensor power supply interception and transmission of the sensor power by the sensor power supply unit and the sensing output signal interception and transmission by the sensor output control unit are performed during a period of not more than 50% of the OFF period of the driving body.

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