KR20190123669A - A camera using light source using camera having user subject eye protect function - Google Patents

Abstract

The present invention relates to a camera using a light source with a subject eye protection function. The present invention comprises: a light source driver installed between a light source for operating a camera and a power supply unit to convert power supplied by the power supply unit into a pulse current, and supply the same to the light source; a light source driver control unit for controlling the on / off operation of the light source driver so that the light source driver converts the power supplied by the power supply unit into a pulse current; a current measuring unit for measuring the pulse current supplied to the light source; an amplitude control unit for controlling the amplitude of the pulse current measured by the current measuring unit; a smoothing circuit unit for smoothing the pulse current with the amplitude controlled by the amplitude control unit; and a comparator / controller for controlling the power supplied by the power supply to be cut off when the smoothing current smoothed by the smoothing circuit unit exceeds a set overcurrent threshold. According to the present invention, an overcurrent flows into the light source during operation of the camera using the light source such as a time of flight (ToF) camera, thereby preventing damage to the eyes of the subject of the photograph.

Description

Camera with light source equipped with subject eye protection {A CAMERA USING LIGHT SOURCE USING CAMERA HAVING USER SUBJECT EYE PROTECT FUNCTION}

The present invention relates to a camera using a light source provided with a subject eye protection function. More specifically, the present invention is provided with a subject eye protection function that can prevent the risk of damage to the eyes of a person, such as a subject, by overcurrent flow into the light source during operation of the camera using a light source such as a ToF (Time of Flight) camera, etc. It relates to a camera using a light source.

Time of Flight (ToF) is a method of calculating the distance by measuring the flight time, that is, the time when light is reflected by the reflection of light, and a ToF camera is a camera that acquires a depth image from an object using this ToF method. .

These ToF cameras are a major technological tool that can be applied to a wide variety of fields such as quadcopters, autonomous vehicles, motion recognition controls, virtual reality, gaming, 3D modeling, and human robot interaction.

On the other hand, as the measurement distance and signal quality of the ToF camera need to be improved, higher performance is required for the light source. These optical powers must also flow higher currents to meet their performance, but these optical powers are limited to industrial safety standards, and products are designed to meet these standards. However, the life of the components that control the board or the failure of the installation environment can cause abnormal operation of the product. In this case, an abnormality occurs in the operation of the light source constantly controlled through the controller, and as a result, there is a problem in that it may damage the eyes of the person who is the subject.

1 is a view showing a subject eye protection device of a conventional ToF camera to solve this problem.

Referring to FIG. 1, a subject eye protection device of a conventional ToF camera includes a light source 10, a power supply unit 20, a light source driver 30, a light source driver control unit 40, a current measuring unit 50, and a comparator 90. It consists of

According to this conventional technology, the current measuring unit 50 measures the current input to the light source 10, that is, the output current of the light source driver 30, and simply based on the measurement result value, the comparator 90 The current blocking process is performed. That is, the comparator 90 blocks the current supplied to the light source 10 when the measured current value is higher than the set reference current.

However, according to this conventional method, since the current measured by the current measuring unit 50 is transmitted to the comparator 90 as it is, when the measured current value is out of the range that the comparator 90 can tolerate, malfunction There is a problem that can occur.

Republic of Korea Patent Application Publication No. 10-2017-0081640 (published: July 12, 2017, the name: device and method for protecting the user from blue light emission) Republic of Korea Patent Application Publication No. 10-2016-0109681 (published: September 21, 2016, the name: method and device for irradiating light used to photograph the iris) Republic of Korea Patent Publication No. 10-2015-0076760 (published date: July 07, 2015, name: vehicle TOF camera and its driving method)

The present invention uses a light source equipped with a subject eye protection function that can prevent the risk of damage to the eyes of a person, such as a subject, by overcurrent flow into the light source during operation of the camera using a light source such as a ToF (Time of Flight) camera It is a technical problem to provide a camera.

In order to solve the above technical problem, a camera using a light source having a subject eye protection function according to an exemplary embodiment of the present invention may be installed between a light source for irradiating light onto a subject and a power supply unit to supply power supplied by the power supply unit to a pulse current. A light source driver for converting the voltage into a light source and supplying the light source to the light source, a current measuring unit measuring a pulse current supplied to the light source, an amplitude control unit controlling an amplitude of the pulse current measured by the current measuring unit, and controlling the amplitude by the amplitude control unit. And a smoothing circuit portion for smoothing the pulsed pulse current and a comparator / controller for controlling the power supplied by the power supply to be cut off when the smoothing current smoothed by the smoothing circuit portion exceeds a set threshold.

In the camera using a light source with a subject eye protection function according to the present invention, the amplitude control unit compares the amplitude of the pulse current measured by the current measuring unit with a set amplitude reference value, the amplitude of the pulse current is the amplitude When the reference value is exceeded, the amplitude of the pulse current is converted to the amplitude reference value or less.

A camera using a light source equipped with a subject eye protection function according to the present invention, further comprising: a device controller for real-time receiving and monitoring status information including comparison information between the smoothing current and the threshold value from the comparison / controller; It features.

In the camera using a light source having a subject eye protection function according to the present invention, the device controller is characterized in that the control to provide the status information to the administrator through the status information display unit or manager terminal.

In a camera using a light source equipped with a subject eye protection function according to the present invention, when the device controller receives the status information of the state in which the smoothing current exceeds the threshold, a warning to inform the emergency situation together with the status information And push the information to a designated manager terminal.

In the camera using a light source provided with a subject eye protection function according to the present invention, the set threshold may be varied according to various situations.

In a camera using a light source equipped with a subject eye protection function according to the present invention, the threshold value is changed to increase in a situation where the amplitude of the smoothing current increases, and the threshold value decreases in a situation where the amplitude of the smoothing current decreases. Characterized in that the variable.

In the camera using a light source with a subject eye protection function according to the invention, the device controller is electrically connected to the light source, the light source is seated on the light source board, the light source board is mounted on the heat sink, The heat sink is fastened to a control board on which the device controller is seated through a coupling member.

In the camera using a light source provided with a subject eye protection function according to the present invention, the light source board is characterized in that it further comprises at least one of an optical sensor or a temperature sensor to detect a variety of situations.

In the camera using a light source provided with a subject eye protection function according to the invention, the heat sink is characterized in that also serves as a lens base on which the lens module to which the light reflected from the subject is incident.

In the camera using a light source equipped with a subject eye protection function according to the present invention, the light source board is seated on one side of the heat sink which also serves as the lens base, characterized in that a plurality of projections are formed on the other side.

In the camera using a light source equipped with a subject eye protection function according to the invention, the device controller is characterized in that for receiving the information on the temperature from the temperature sensor to control the power supply.

In the camera using a light source equipped with a subject eye protection function according to the present invention, the device controller compares the clock signal for driving the light source driver and the pulse current measured by the current measuring unit to control the power supply unit It is characterized by.

According to the present invention, a light source having a subject eye protection function capable of preventing the risk of damage to the eyes of a person, such as a subject, due to an overcurrent flowing into the light source during operation of a camera using a light source such as a ToF (Time of Flight) camera. The camera using the effect is provided. In addition, the reference value for blocking the over-current is changed so that more accurate subject information can be sensed and additional safety can be improved.

1 is a view showing a subject eye protection device of a conventional ToF camera,
2 is a view showing a camera using a light source with a subject eye protection function according to an embodiment of the present invention,
3 is a diagram for describing a detailed operation of a camera using a light source provided with a subject eye protection function according to an embodiment of the present invention.
4 is an exemplary waveform diagram for describing an amplitude control process by an amplitude controller according to an embodiment of the present disclosure.
FIG. 5 is an exemplary waveform diagram for describing a process of smoothing an amplitude controlled pulse current to a smoothing current by a smoothing circuit unit according to an exemplary embodiment.
6 is a view showing a camera using a light source with a subject eye protection function according to another embodiment of the present invention,
FIG. 7 is an exemplary waveform diagram illustrating that an overcurrent threshold, which is a reference value of a comparator / controller, is changed according to an external condition when a current smoothed by the smoothing circuit unit is compared with an overcurrent threshold according to another embodiment of the present disclosure. ,
8 is an exploded perspective view of a camera in which the technical idea of the present invention is implemented.
8 is an exemplary exploded perspective view of a camera using a light source with a subject eye protection function according to an embodiment of the present invention;
9 is another exemplary exploded perspective view of a camera using a light source with a subject eye protection function according to an embodiment of the present invention.

Specific structural or functional descriptions of the embodiments according to the inventive concept disclosed herein are provided only for the purpose of describing embodiments according to the inventive concept, and the embodiments according to the inventive concept may be in various forms. And the embodiments described herein are not limited to the embodiments described herein.

Embodiments according to the inventive concept may be variously modified and have various forms, so embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the embodiments in accordance with the concept of the invention to the specific forms disclosed, it includes all changes, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first or second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another, for example without departing from the scope of the rights according to the inventive concept, and the first component may be called a second component and similarly the second component. The component may also be referred to as a first component.

When a component is referred to as being "connected" or "connected" to another component, it may be understood that it may be directly connected or connected to that other component, but other components may be present in between. will be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle. Other expressions describing the relationship between components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring", should be interpreted as well.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described herein, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined herein. .

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention;

2 is a diagram illustrating a camera using a light source provided with a subject eye protection function according to an embodiment of the present invention.

Referring to FIG. 2, a camera 1 using a light source having a subject eye protection function according to an exemplary embodiment of the present invention may include a light source 10, a power supply unit 20, a light source driver 30, and a light source driver controller ( 40, a current measuring unit 50, an amplitude control unit 60, a smoothing circuit unit 70, a comparison / controller 80, a device controller 100, and a status information display unit 110.

For example, the camera applied to an embodiment of the present invention may be a ToF (Time of Flight) camera or a ToF camera, but the camera is not limited thereto, and any light source 10 required in the operation process may be used. May be a camera.

Before describing an embodiment of the present invention, one embodiment of the present invention is not limited to the field to which it can be applied, but in particular, a high-efficiency ToF camera will be briefly described as follows.

ToF is a method of calculating a distance by measuring flight time, that is, a time when light is reflected by being reflected, and a ToF camera is a camera that acquires a depth image from an object using this ToF method. Such ToF cameras can be applied to a wide range of applications, including quadcopters, autonomous vehicles, motion recognition controls, virtual reality, gaming, 3D modeling, and human robot interaction. to be.

The light source 10 performs a function of outputting light, which is a means for obtaining camera operation, for example, depth information.

Although described in the process of describing the prior art, as the measurement distance and signal quality of the ToF camera are required to be improved, higher performance is required for the light source 10. The optical power needs to increase the current value to satisfy the performance, but the optical power is limited in accordance with the industrial safety standards, and the product is designed to meet the standard. However, the life of the parts that control the board or the failure of the installation environment can cause abnormal operation of the product. In this case, an abnormality occurs in the operation of the light source 10 which is constantly controlled through the controller, and damages the human eye when the object as the subject is a human. One embodiment of the present invention, through the combination of the following components, in the abnormal operation of the product to prevent the risk of damage to the eyes of the person who is subject to the overcurrent flow into the light source 10.

The power supply unit 20 performs a function of supplying power for operating the light source 10. As will be described later, the power supply unit 20 is provided with a function for interrupting the power supply according to a control signal from the comparator / controller 80.

The light source driver 30 is installed between the light source 10 and the power supply 20 for outputting light for camera operation according to the supplied current, and the power supplied by the power supply 20 is converted into a pulse current. It converts and supplies the light to the light source 10. For example, the light source driver 30 may be composed of a switching element such as a field effect transistor (FET). As described above, in order to increase the sensing performance of the ToF camera, it is necessary to increase the optical power level by increasing the current value supplied to the light source. By using this pulse driving method, the instantaneous light output value is increased and the current is not supplied. The off section has the advantage that it is possible to stably supply the overall optical power.

The light source driver controller 40 controls the on / off operation of the light source driver 30 so that the light source driver 30 converts the power supplied by the power supply 20 into a pulse current supplied to the light source 10. Do this. For example, when the light source driver 30 is a switching element such as a field effect transistor, the light source driver control unit 40 inputs a pulse modulated signal to a gate terminal which is a control terminal of the field effect transistor. The operation of the light source driver 30 may supply a pulse current to the light source 10 under the control of the light source driver controller 40. These pulse currents are clearly divided into On / Off sections, and a considerable current flows in the On sections. Although a significant amount of light energy is generated in the on period, the amount of light energy generated per hour is limited through the off period, but if a problem occurs in circuit control (for example, a circuit short circuit) CW-Continuous Wave increases the accumulated energy, which can cause damage to the human eye. In order to solve this problem, a human eye may be protected by using protection circuits such as the amplitude control unit 60, the smoothing circuit unit 70, the comparison / controller 80, and the like.

The current measuring unit 50 measures the pulse current supplied from the light source driver 30 to the light source 10 and transmits the pulse current to the amplitude control unit 60.

The amplitude control unit 60 performs a function of controlling the amplitude of the pulse current measured by the current measuring unit 50.

For example, referring to FIG. 4, which is an exemplary waveform diagram illustrating an amplitude control process by the amplitude control unit 60, the amplitude control unit 60 may include 1) a pulse current measured by the current measurement unit 50. The amplitude of the pulse current is compared with the set amplitude reference value, and when the amplitude of the pulse current exceeds the amplitude reference value, the amplitude of the pulse current is converted to the amplitude reference value or less, and 2) when the amplitude of the pulse current is less than the amplitude reference value, the pulse current is smoothed. The circuit unit 70 can be bypassed as it is. The reason for lowering the amplitude of the pulse exceeding the predetermined reference value through the amplitude control unit 60 is that the current value smoothed through the smoothing circuit is too large in the case of the pulse exceeding the reference value in the comparator / controller 80 This is because the comparison with the reference value can be difficult. Therefore, in order to accurately operate the comparator / controller 80, it is necessary to control the pulse amplitude according to the reference value in the amplitude controller 60 in advance. In addition, the strength of the current set to the light source 10 is different depending on the product, it is impossible to bring the rated current that the comparison / controller 80 can afford to fit the boards of the products with different current strength. Therefore, if the measured current by setting a constant amplitude reference value is the amplitude that can be handled by the comparator / controller 80, it does not matter and bypasses it. If the measurement is high, the amplitude is reduced to enter the desired amplitude. Can be shared.

The smoothing circuit unit 70 performs a function of smoothing the pulse current amplitude controlled by the amplitude control unit 60.

In FIG. 5, an exemplary waveform diagram showing a process in which the amplitude controlled pulse current is smoothed to the smoothing current by the smoothing circuit unit 70 is disclosed.

As shown in FIG. 5A, the amplitude control unit 60 changes the amplitude of the pulse current so that the amplitude of the pulse current measured by the current measuring unit 50 changes to a pulse whose amplitude is lowered when the amplitude exceeds a predetermined amplitude reference value. To control. After that, as disclosed in FIG. 5B, the pulse current having the smaller amplitude is changed into a signal having a voltage value smaller than the amplitude of the amplitude controlled pulse through the smoothing circuit unit 70. The changed signal is compared with the reference value in the compare / controller 80.

In general, when a problem occurs in a circuit, a continuous wave (CW) is generated by an electrical short. In consideration of this point, a short test is performed during product design to set a reference value for determining whether a short circuit occurs in advance, and the reference value set in the comparator / controller 80 is then provided by the smoothing circuit unit 70. Compare to the signal to determine whether the circuit is short.

The comparator / controller 80 controls to cut off the power supplied by the power supply unit 20 when the smoothing current smoothed by the smoothing circuit unit 70 exceeds the set overcurrent threshold. As a specific example, when the smoothing current exceeds the overcurrent threshold, the comparator / controller 80 may control not to output power from the power supply unit 20 itself.

The device controller 100 performs a function of real-time reception and monitoring of state information including comparison information of a smooth current and an overcurrent threshold from the compare / controller 80 and a database.

For example, the device controller 100 may control the state information to be provided to the administrator in real time through the state information display unit 110 including a monitor.

For example, the device controller 100 may control the state information to be provided to the manager terminal 200 in response to a request from a predetermined manager terminal 200.

For example, when the device controller 100 indicates that the state information received from the comparator / controller 80 indicates that the smoothing current exceeds the overcurrent threshold, that is, a situation that may damage the use. It may be configured to push the warning information indicating the emergency situation together with the status information to the designated manager terminal 200.

Referring to FIG. 3, a detailed operation of the camera 1 using a light source equipped with a subject eye protection function according to an embodiment of the present invention will be described. 3 is only one exemplary operation, and an embodiment of the present invention is not limited thereto.

Referring to FIG. 3, in step S10, a process of supplying power to the light source driver 30 by the power supply unit 20 is performed at the beginning of the product operation.

In step S20, under the control of the light source driver control unit 40, the light source driver 30 converts the power supplied by the power supply unit 20 into a pulse current to supply the light source 10 to the light source 10. The intensity of the output light of 10) is proportional to the intensity of the input pulse current, for example, the amplitude.

In step S30, the current measuring unit 50 measures the pulse current supplied from the light source driver 30 to the light source 10, and transmits the pulse current to the amplitude control unit 60.

In step S40, the amplitude controller 60 compares the amplitude of the pulse current measured by the current measurement unit 50 with the set amplitude reference value. As a result of the comparison in step S40, 1) if the amplitude of the pulse current exceeds the amplitude reference value, it is switched to step S50, and 2) if the amplitude of the pulse current is less than the amplitude reference value, it is switched to step S60.

In step S50, the amplitude control unit 60 converts the amplitude of the pulse current, which is the output of the light source driver 30 received through the current measuring unit 50, to an amplitude reference value or less, and transmits the amplitude to the smoothing circuit unit 70. do. The amplitude control of the pulse current performed by the amplitude control unit 60 has been described with reference to FIG. 4.

In step S60, since the amplitude of the pulse current is equal to or less than the amplitude reference value, there is no problem in the comparison and control operation of the comparison / control unit. Since the process of reducing the amplitude is not necessary, the amplitude control unit 60 smoothes the pulse current. 70) a bypass is performed as it is.

In step S70, the smoothing circuit unit 70 performs a smoothing operation of the pulse current controlled by the amplitude control unit 60. The process of smoothing the pulse current to the smoothing current by the smoothing circuit unit 70 has been described with reference to FIG. 5.

In step S80, the comparison / controller 80 compares the smoothing current smoothed by the smoothing circuit unit 70 with a preset overcurrent threshold. As a result of the comparison in step S80, 1) when the smoothing current exceeds the overcurrent threshold, the process is switched to step S90; and 2) when the smoothing current is below the overcurrent threshold, the power is continuously supplied by switching to step S10 without a separate control operation. do.

The state of step S90 is a state in which the smoothing current exceeds the overcurrent threshold, and when left in this state, an excessive amount of overcurrent is supplied to the light source 10 so that the light source 10 generates high output light that may damage the eyes of the subject. Will diverge. Therefore, in step S90, the comparison / controller 80 controls to cut off the power supplied by the power supply 20. For example, in step S90, the comparison / controller 80 may control the power supply unit 20 not to output power. In this case, since no power is supplied to the light source driver 30, no current is input to the light source 10, and the light output by the light source 10 is blocked.

6 is a diagram illustrating a camera using a light source having a subject eye protection function according to another exemplary embodiment of the present invention. The basic configuration, function, and operation are similar to those of the embodiment according to FIG. 2, and the following description will focus on differences.

In the case of a camera using a light source, information of a subject is sensed in various environments. For example, when the camera is exposed to an outdoor environment instead of an indoor environment, a stronger light should be irradiated to the subject for more accurate sensing, and a stronger light should be irradiated to sense a distant subject. Conversely, when the subject is near, weaker light should be emitted. In order to determine such various external conditions, the camera according to the present invention includes an optical sensor such as a photodiode and analyzes an optical wavelength band to actively determine which condition the camera is in. If it is determined that the light source needs to be strongly irradiated, the amplitude value of the smoothed current will increase, and accordingly, the reference value is changed to increase the overcurrent threshold, which is a safety reference value. On the contrary, if it is determined that the light source should be weakly irradiated, the reference value is changed so that the amplitude value of the smoothed current is made small and accordingly the overcurrent threshold is made small.

FIG. 7 is a waveform diagram illustrating an example in which an overcurrent threshold reference value according to FIG. 6 is changed. 7 (a) is a waveform diagram showing the smooth current amplitude and the overcurrent threshold when the camera operates indoors, and FIG. 7 (b) is a waveform diagram according to the operation of the camera outdoors. . In the case of the outdoor, since the light should be irradiated with a stronger intensity than the indoor, the smoothing current amplitude of FIG. 7 (b) is larger than that of FIG. 7 (a). Therefore, since the smoothing current amplitude is increased, the overcurrent threshold value, which is a reference value, is also varied so that the subject information can be sensed more accurately without an error in camera operation even in an outdoor situation. On the contrary, even if a camera is installed indoors, for example, if a subject such as an animal suddenly approaches the camera, as shown in FIG. 7 (c), the amplitude of the smoothing current is reduced and the overcurrent threshold value, which is a safety reference value, is set to be small to prevent from excessive light. Protect the subject.

According to FIG. 6, the device controller 100 receives the information measured by the optical sensor 120 and analyzes it to variably control the reference value of the comparison / controller 80. In addition, the apparatus controller 100 may variably control the reference value of the comparator / controller 80 by analyzing the subject image information obtained through the lens module 6 and the lens driver 90 without a separate optical sensor 120. have. The comparison / controller 80 compares the variably controlled reference value (overcurrent threshold value) with the smoothing current amplitude value provided from the smoothing circuit unit 70, and if the smoothing current amplitude value is larger than the reference value of the overcurrent threshold value, the power supply unit 20 Control no longer supplies power. In addition, the device controller 100 may control the lens driver 90 to no longer operate when the power supply unit 20 no longer supplies power, thereby preventing a power loss problem.

In the embodiment according to FIG. 6, a temperature sensor 3 such as a thermistor may be further provided to provide an additional protection function to a camera using a light source. More specifically, when irradiated with stronger light, a lot of heat energy may be generated around the light source, and if such heat energy is continuously accumulated, there is a possibility of damaging the circuit device. In order to solve this problem, the temperature sensor 3 is disposed around the light source, and the device controller 100 receives the temperature information and analyzes it, and if the temperature is higher than the set temperature according to the set time, the device controller 100 supplies the power supply unit 20. ) To control the power supply unit 20 from supplying power anymore.

In addition, the device controller 100 compares the clock signal applied to the light source driver controller 40 to generate the pulse current and the waveform of the actual pulse current measured by the current measuring unit 50. In this case, it may be determined that the abnormal pulse current is being supplied to the light source, and thus, the power supply unit 20 may not control the power supply 20 to provide additional protection.

8 and 9 are exemplary exploded perspective views of a camera using a light source provided with a subject eye protection function according to an embodiment of the present invention.

8 is an exploded perspective view illustrating a configuration of a camera using a light source in which technical spirits of various embodiments of the present disclosure are implemented.

8 and 9 (a) and (b), a camera using a light source with a subject eye protection function according to an embodiment of the present invention (1) The camera according to the present invention is to irradiate light to the subject A light source 10, a lens module 6 on which light reflected from a subject is incident, a lens base 7 on which the lens module lens module 6 is seated, a light source 10, and a temperature sensor measuring a temperature adjacent thereto ( 3) and a light source board 1 on which the light sensor 120 for measuring ambient light is seated, a heat sink 4 for mounting the light source board 1 and dissipating heat generated from the light source 10 to the outside, Various circuit elements 9 such as a device controller 100 and a power supply unit 20, a device and a light source driver and a current measuring unit 50 circuit, and a smoothing circuit unit 70 for controlling the overall operation of the camera are mounted. It can be configured to include a control board 8 and a coupling member 5 for coupling the control board 8 and the heat sink 4 mutually. It has been composed. In particular, in order to simplify the manufacturing process, improve heat dissipation efficiency and reduce manufacturing cost, the heat sink 4 and the lens base 7 of FIG. As in the lens module 6 may be configured to be seated on the heat sink / lens base integrated module (2). In particular, the light source board 1 on which the light source 10 and the light sensor 120 or the temperature sensor 3 are mounted may be seated at one end of the heat sink / lens base integrated module 2, and at the other end of the heat sink / lens base integrated module 2. A plurality of protrusions may be formed to widen the contact area to maximize heat dissipation efficiency. In addition, according to the example illustrated in FIG. 9 differently from the example disclosed in FIG. 8, various circuit elements 9 such as the device controller 100, the power supply unit 20, the current measuring unit 50, the smoothing circuit unit 70, and the like may be used. ) May be seated on the lower surface, not shown in the drawings, on both sides of the control board 8.

As described in detail above, according to the present invention, the subject's eyes that can prevent the risk of damage to the eyes of the person, such as the subject, due to overcurrent flow into the light source during operation of the camera using a light source such as a ToF (Time of Flight) camera, etc. There is an effect that a camera using a light source provided with a protection function is provided. In addition, the reference value for blocking the over-current is changed so that more accurate subject information can be sensed and additional safety can be improved.

1: Camera with light source with subject eye protection
2: heat sink / lens base integrated module, 3: temperature sensor, 4: heat sink
5: coupling member, 6: lens module, 7: lens base, 8: control board
9: circuit element, 10: light source, 20: power supply, 30: light source driver
40: light source driver control unit, 50: current measuring unit, 60: amplitude control unit
70: smooth circuit portion, 80: comparator / controller, 90: lens drive portion
100: device controller, 110: status information display unit, 120: light sensor
200: manager terminal

Claims (13)

A light source driver installed between a light source for irradiating light to a subject and a power supply unit to convert power supplied by the power supply unit into a pulse current to supply the light source to the light source;
A current measuring unit measuring a pulse current supplied to the light source;
An amplitude control unit for controlling the amplitude of the pulse current measured by the current measuring unit;
A smoothing circuit unit for smoothing a pulse current amplitude controlled by the amplitude control unit; And
And a comparator / controller which controls to cut off the power supplied by the power supply when the smoothing current smoothed by the smoothing circuit portion exceeds a set threshold. The method of claim 1,
The amplitude control unit,
And comparing the amplitude of the pulse current measured by the current measuring unit with a set amplitude reference value, and converting the amplitude of the pulse current to the amplitude reference value or less when the amplitude of the pulse current exceeds the amplitude reference value. , Camera. The method of claim 1,
And a device controller for receiving and monitoring in real time state information including comparison information of the smoothing current and the threshold from the comparison / controller. The method of claim 3,
And the device controller controls the status information to be provided to an administrator through a status information display unit or an administrator terminal. The method of claim 3,
And when the device controller receives the status information of a state in which the smoothing current exceeds the threshold, pushes warning information indicating an emergency situation together with the status information to a designated manager terminal. The method of claim 1,
The set threshold may be varied according to various situations. The method of claim 6,
And the threshold value is increased in a situation where the amplitude of the smoothing current increases, and the threshold value is changed in a situation where the amplitude of the smoothing current decreases. The method of claim 3,
The device controller is electrically connected to the light source, the light source is seated on a light source board, the light source board is seated on a heat sink, and the heat sink is connected to a control board on which the device controller is seated through a coupling member. A camera, characterized in that fastened. The method of claim 8,
The light source board further comprises at least one of an optical sensor or a temperature sensor to detect various situations. The method of claim 8,
The heat sink is a camera, characterized in that also serves as a lens base on which the lens module to which the light reflected from the subject is incident. The method of claim 10,
The camera, characterized in that the light source board is seated on one side of the heat sink that also serves as the lens base and a plurality of protrusions are formed on the other side. The method of claim 9,
And the device controller receives information about temperature from the temperature sensor and controls the power supply. The method of claim 3,
And the device controller controls the power supply unit by comparing a clock signal for driving the light source driver with a pulse current measured through the current measuring unit.

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