KR101435472B1 - Elevator monitoring system, and method thereof for controlling a focus of transmitting light - Google Patents

Abstract

The present invention relates to an elevator surveillance system capable of transmitting a surveillance image photographed in an elevator to an optical signal of an invisible band and controlling the focal point of transmission light for an optical signal transmitted from a light emitting unit to a light receiving unit by using an optical signal of a visible band, System and a transmission optical focus adjustment method thereof.
An elevator monitoring system according to the present invention is an elevator monitoring system for transmitting a surveillance image photographed in an elevator with an optical signal, the elevator monitoring system comprising: a first light emitting unit for emitting the optical signal as light of a visible band; And a second light emitting unit emitting light in a non-visible band; A fixture for seating and fixing the optical transmitter; A control bolt inserted into each of the corners of the fixing table to fix the optical transmission unit and adjust a focus of light emitted from the first light emitting unit with respect to light of a visible band; And a light receiving section that receives light of the visible band or a light receiving section that receives light of the non-visible band.

Description

Technical Field [0001] The present invention relates to an elevator monitoring system and an elevator monitoring system,

The present invention relates to an elevator surveillance system capable of transmitting a surveillance image capturing a situation in an elevator to an optical signal of an invisible band and controlling the focal point of transmission light for an optical signal transmitted from a light emitting unit to a light receiving unit by using an optical signal of a visible band, System and a transmission optical focus adjustment method thereof.

Generally, elevators installed in high-rise apartment buildings and buildings are usually enclosed spaces, and security cameras such as CCTV are installed in the elevator due to security and safety problems.

In other words, the elevator adopts a surveillance camera system to protect the passengers due to the fact that the interior is a closed space and that there is a risk of a breakdown or crime occurring during a safety accident or operation, and the surveillance camera system is monitored in a security room or a central control room .

In this case, a surveillance camera is installed at a specific position such as a ceiling inside the elevator, and the surveillance camera transmits the surveillance image captured by the surveillance room or the central control room through the coaxial cable.

However, in the case of a coaxial cable that transmits a surveillance video from a surveillance camera inside the elevator to a security room or a central control room, there is a problem in that the surveillance image can not be transmitted due to the cable being damaged or the cable itself being cut off due to the elevation of the elevator .

In addition, when the elevator rises to a high level, surveillance images inside a clear elevator can not be stably transmitted due to signal noise, etc., and a sudden change in temperature and pressure such as in the winter season can cause copper waves or disconnection. There is a problem that not only the installation cost is excessively high but also the maintenance cost of the wired line is increased.

Korean Registered Patent No. 913,127 (registered on August 13, 2009)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a method and an apparatus for transmitting a surveillance image photographed in an elevator with an optical signal of non- An elevator monitoring system capable of controlling an optical power by using an optical signal, and a transmission optical focus control method thereof.

According to an aspect of the present invention, there is provided an elevator surveillance system for transmitting a surveillance image photographed in an elevator by an optical signal, the elevator surveillance system comprising: a first light emitting unit And a second light emitting unit that emits the optical signal as light in an invisible band; A fixture for seating and fixing the optical transmitter; A control bolt inserted into each of the corners of the fixing table to fix the optical transmission unit and adjust a focus of light emitted from the first light emitting unit with respect to light of a visible band; And a light receiving section including a light receiving section for receiving the light of the visible band or the light of the non-visible band.

The light transmitting unit and the fixing base are formed with insertion holes at respective corners so as to correspond to each other, and the adjustment bolt is inserted into the insertion hole in a threaded manner so that the optical transmitter and the fixing base are seated and fixed .

The adjusting bolt may include a left bolt for adjusting the focus of the visible light to the left, a right bolt for adjusting the focus of the visible light to the right, a right bolt for adjusting the focus of the light of the visible band, And a lower bolt for adjusting the focal point of the light of the visible band downward.

In addition, when the left bolt is inserted in a clockwise direction, the focal point of the light of the visible band is adjusted to the left side, and when the right bolt is inserted in a clockwise direction, .

In addition, when the upper bolt is inserted in a clockwise direction, the focal point of the light of the visible band is adjusted upward, and when the lower bolt is inserted in a clockwise direction, the focus of the light of the visible band is adjusted downward .

When the left bolt is turned counterclockwise, the focal point of the light of the visible band is adjusted to the right, and when the right bolt is turned counterclockwise, the focal point of the light of the visible band may be adjusted to the left have.

When the upper bolt rotates counterclockwise, the focal point of the light of the visible band is adjusted downward. When the lower bolt rotates counterclockwise, the focus of light of the visible band may be adjusted upward have.

The optical transmission unit may include a magnet at a lower end of the fixed base on which the optical transmission unit is fixed, and the optical transmission unit may be fixed to the fixed bracket by a magnetic force through the magnet.

According to another aspect of the present invention, there is provided a light emitting device including a first light emitting unit that emits an optical signal as light of a visible band, and a second light emitting unit that emits the optical signal as light of a non- And a control unit for receiving the optical signal, the control unit comprising: (a) a control unit for controlling the focus of the optical signal from the operation unit to the focal point of the optical signal, Inputting an adjustment command to the control unit; (b) the control unit activates the first light emitting unit to emit light of a visible band through the first light emitting unit and transmit the light to the light receiving unit; (c) adjusting the focus of the light of the visible band through the adjusting bolt; And (d) terminating the operation of the first light emitting unit when the focus adjustment completion command of the optical signal is input from the operation unit.

In addition, in the step (c), when the bolt on the left side of the adjusting bolt rotates clockwise, the focal point for the light of the visible band is adjusted to the left, and when the bolt on the right side of the adjusting bolt turns clockwise, The focus for the light of the light source can be adjusted to the right.

In addition, in the step (c), when the upper bolt of the adjusting bolt turns clockwise, the focal point of the light of the visible band is adjusted upward, and when the lower bolt of the adjusting bolt turns clockwise, The focus for the light of the light source can be adjusted downward.

In the step (c), when the left bolt of the adjusting bolt turns counterclockwise, the focal point of the light of the visible band is adjusted to the right, and when the right bolt of the adjusting bolt turns counterclockwise, The focus for light in the visible band can be adjusted to the left.

In the step (c), when the upper bolt of the adjusting bolt turns counterclockwise, the focal point of the light of the visible band is adjusted downward. When the lower bolt of the adjusting bolt turns counterclockwise, The focus for light in the visible band can be adjusted upward.

According to the present invention, since a surveillance video of a situation in an elevator is transmitted through wireless transmission through infrared light, there is no problem that the cable is damaged or the cable itself is broken by the operation of the elevator up and down The surveillance image can be transmitted stably.

Also, even if the elevator rises to a high level, a surveillance image is transmitted through infrared light, so that a stable surveillance image can be stably transmitted without being affected by signal noise or the like.

In addition, as in the winter season, due to rapid changes in temperature and pressure, it is possible to securely transmit radio waves through infrared light differently from the conventional method in which copper waves or disconnection occur, so that the initial installation cost is not excessively increased, It is possible to solve the problem that a large amount of money is injected.

The optical focal point can be easily adjusted so that light of the visible band can be accurately received by the light receiving unit by transmitting the light of the visible band from the light emitting unit to the light receiving unit by adjusting the adjusting bolt while viewing the light of the visible band.

1 is a block diagram schematically showing a configuration of an elevator monitoring system to which the present invention is applied.
2 is a view showing only components of an optical transmitter and a light receiver according to an embodiment of the present invention.
3 is a block diagram showing functional blocks of an optical transmitter according to an embodiment of the present invention.
4 is a block diagram showing functional blocks of a light receiving unit according to an embodiment of the present invention.
5 is a view illustrating a structure of a light emitting unit and a light receiving unit according to an embodiment of the present invention.
6 is a block diagram illustrating a main structure of an optical transmitter for controlling a light emitting unit according to an embodiment of the present invention.
7 is a view showing the light transmission angle of the light emitting unit and the light receiving angle of the light receiving unit according to the embodiment of the present invention.
8 is a cross-sectional view of an optical transmitter according to an embodiment of the present invention.
9 is a view showing an example of a control bolt for adjusting focus for light of a visible band according to an embodiment of the present invention.
10 is a view illustrating an example in which the focal point of the light of the visible band is adjusted by the adjusting bolt according to the embodiment of the present invention.
11 is a flowchart illustrating a method of adjusting a transmission optical focus of an elevator monitoring system according to an embodiment of the present invention.
12 is a view illustrating an example in which a light transmitting unit and a light receiving unit are fixedly mounted by a magnet according to an embodiment of the present invention.
13 is a view showing an example in which a transparent acrylic outer cover is installed in the light transmitting unit and the light receiving unit according to the embodiment of the present invention.
FIG. 14 is a view illustrating an example in which a light receiving unit according to an embodiment of the present invention incorporates a material capable of reflecting light and collects and receives optical signals.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that it is not intended to be limited to the particular embodiments of the invention but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An elevator monitoring system and a transmission optical focus adjusting method according to the present invention will be described in detail with reference to the accompanying drawings. In the following description with reference to the accompanying drawings, the same or corresponding components will be denoted by the same reference numerals, and redundant description thereof will be omitted.

1 is a block diagram schematically showing a configuration of an elevator monitoring system to which the present invention is applied.

1, an elevator monitoring system to which the present invention is applied includes an elevator 100, an image processing unit 110, an optical transmitter 120, a light receiving unit 130, a terminal unit 140, and a monitoring computer 150, .

The elevator 100 is a device which moves up or down when people are boarded. The image processor 110 captures the inside of the elevator to acquire a supervised image, and the optical transmitter 120 converts the acquired supervised image into an optical signal The optical receiver 130 receives the optical signal and converts the optical signal into a monitor image, and the monitor computer 150 stores or displays the monitor image.

Here, the image processing unit 110 has a function of converting an analog type monitoring image photographed from a surveillance camera 200 such as a closed circuit TV (CCTV) into a digital signal and delivering it to the optical transmitter 120 .

Accordingly, the optical transmitter 120 transmits the digital image signal of the surveillance image transmitted from the image processor 110 to the optical receiver 230 as an infrared light, an LED light, or a laser light.

In the embodiment of the present invention, optical communication is used as an image transmission method between the optical transmitter 120 and the optical receiver 130. Optical communication is a method of converting information into an optical signal and transmitting it. For this purpose, a transmitter converts voice, image, and data into electric signals and transmits them as optical signals. Of course, the receiving side receives the optical signal, converts it into an electrical signal, and restores it to the original voice, image, and data.

That is, the information to be transmitted is converted into an electric signal, and the electric signal is converted into light by being input to a laser, a photo (optical) diode, or the like. For example, if the information to be transmitted is a video, a pulse coding modulation (PCM) process is performed as in the case of a general electrical communication, so that a signal input to the photoelectric conversion device becomes a binary signal of 1 and 0. A photoelectric transducer (laser, photodiode, etc.) receives a binary signal of 1, 0 and converts it into a light intensity. The optical signal changed by the intensity of the light is transmitted to the remote site, and the receiver side performs the reverse conversion process to recover the original image. Transmission and restoration of text, audio, and video, not image information, are performed through the same process.

In the embodiment of the present invention, a surveillance image is transmitted using an infrared ray, a laser or an LED as an optical signal. Since the laser does not use the optical fiber used as a transmission medium in the optical communication but uses the strong directivity of the laser, there is no band interference and it is stable for data transmission.

Accordingly, the optical transmitter 120 has various components for processing digital image data into optical signals, and a block diagram showing the components is shown in FIG. In addition, a light receiving unit 130 for receiving and processing image data from the optical transmitting unit 120 by an optical signal is constituted, and a block diagram thereof is shown in FIG. This will be described in detail in the drawings.

When the optical signal is received in the optical receiver 130, the optical receiver 130 restores the optical signal into digital image data and transmits it to the surveillance computer 150. Of course, a terminal unit 140 is provided between the monitoring computer 150 and the light receiving unit 130 to connect the light receiving unit 130 to the monitoring computer 150.

The monitoring computer 150 is usually provided in a guard room (not shown) or a central control room (not shown). Since the central control room may be far away from the elevator 100, the terminal computer 140 may be connected to the surveillance computer 150 and the optical receiver 130 in order to stably process the signal. Of course, if the distance between the elevator 100 and the monitoring computer 150 is long, the electrical signal becomes weak. Therefore, an amplifier circuit for compensating the electrical signal can be designed in the terminal unit 140.

The surveillance computer 150 stores surveillance images photographed inside the elevator 100 and displays them on a screen. Accordingly, the surveillance computer 150 includes a storage device (not shown) such as a DVR for storing surveillance images acquired by the elevator 100. The storage device may be a hard disk drive of a computer or a tape of a storage medium. This is because the elevator 100 has a security vulnerability as described above, and it is necessary to record such information as a situation such as a crime may occur.

In addition, the monitoring computer 150 has a monitor, for example, so that a supervised video image of situations occurring in the elevator 100 through the monitor can be viewed on the screen in real time.

2 is a view showing only components of an optical transmitter and a light receiver according to an embodiment of the present invention.

2, the surveillance image photographed from the surveillance camera 200 installed in the elevator 100 is processed as image data by the image processor 110 and transmitted to the optical transmitter 120. The optical transmitter 120 transmits Data is converted into an optical signal and is emitted as infrared light, LED light or laser light.

The light receiving unit 130 provided corresponding to the optical transmitting unit 120 receives the optical signal emitted from the optical transmitting unit 120 and converts the optical signal into image data and transmits the converted optical signal to the monitoring computer 150 via the terminal unit 140 .

3 is a block diagram showing functional blocks of an optical transmitter according to an embodiment of the present invention.

3, an optical transmitter 120 according to an embodiment of the present invention includes a signal input unit 300, a signal detection unit 302, a display unit 304, a signal conversion unit 306, a light emitting unit 308, Gt; 310 < / RTI >

The signal input unit 300 receives the surveillance image captured by the surveillance camera 200 and transmits the surveillance image to the signal conversion unit 306 or the signal detection unit 302.

The signal detection unit 302 receives the video signal from the signal input unit 300 and determines whether the video signal is normally received and transmits the signal to the display unit 304.

The display unit 304 is composed of, for example, a light emitting diode (LED), and emits light of a specific color when a video signal is normally input. For example, when a video signal is input, green is displayed, and when a video signal is not input, red (red) is displayed. Therefore, the user can check whether the video signal is normally input even if only the emission color of the LED is seen.

The signal converting unit 306 converts a video signal input through the signal input unit 300 into a frequency component. The frequency band of 10 MHz to 100 MHz may be used as the normal frequency band, but the present invention is not limited to this, and it is also possible to use a frequency band of 1 GHz or more or a frequency band of 1 GHz or more.

The light emitting unit 308 converts the frequency signal converted by the signal converting unit 306 into an optical signal. Particularly, in the embodiment of the present invention, LED light, laser light or infrared light can be used as an optical signal. Therefore, the light emitting portion 308 can transmit data by adjusting the intensity of the laser beam using, for example, a laser diode.

Further, the light emitting portion 308 includes an optical portion (not shown) though not shown. That is, an optical unit (not shown) is configured so that the optical signal has a certain intensity and a certain angle. For this purpose, a lens is constituted in the optical part. Of course, lenses can use convex lenses that can gather light inward.

The power supply unit 310 functions to supply power to the above components. That is, an external AC power source (about 220 V) is converted into a DC power source (DC) of 12 V and supplied. Of course, the down-transform method can be applied to improve the quality of the signal. In order to minimize the mutual signal interference among the constituent circuit components, power is separately supplied to each constituent element. Of course, it is also possible to use a portable battery without using an AC power source.

4 is a block diagram showing functional blocks of a light receiving unit according to an embodiment of the present invention.

4, a light receiving unit 130 according to an exemplary embodiment of the present invention includes a power supply unit 440, a light receiving unit 450, a voltage step-up unit 452, a reference frequency generation unit 454, a frequency conversion unit 456 A frequency detecting unit 458, a voltage converting unit 460, and a filter unit 462.

The power supply unit 440 supplies power necessary for the operation of the light receiving unit.

The light receiving unit 450 receives the LED light or the laser light from the light emitting unit 408 shown in FIG. 3 and transmits the LED light or the laser light to the frequency converting unit 456. At this time, the light receiving unit 450 performs a function of sensing the LED light or the laser light emitted from the light emitting unit 408. For this purpose, a photodetector is constructed.

Of course, it can be configured as a high-performance POST amplifier. That is, in order to receive the laser beam emitted from the laser diode constituted in the light emitting unit 408, it is necessary to be able to sense a minute signal, thereby constituting a high performance POST amplifier. In addition, a power supply unit 440 is configured similarly to the optical transmission unit 120 to provide the boost voltage to the POST amplifier.

Therefore, the power supply unit 440 converts an external AC power source (about 220 V) into a DC power source (DC) of 12 V and supplies the converted power. Of course, the down-transform method can be applied to improve the quality of the signal. In order to minimize the mutual signal interference among the constituent circuit components, power is separately supplied to each constituent element.

The voltage step-up unit 452 boosts the power for detecting the LED light or laser light, which is an optical signal, and supplies it to the light-receiving unit 450. The voltage supplied from the normal power supply unit 440 to the light receiving unit 450 becomes 5V DC, which is stepped up to about 70-100V.

The frequency converter 456 amplifies the fine optical signal, converts the optical signal into an electrical signal, and generates a frequency component corresponding to the signal.

The reference frequency generator 454 performs a function of generating a reference frequency for restoring the original signal.

The frequency detector 458 compares the frequency received from the frequency converter 456 with the reference frequency transmitted from the reference frequency generator 454 and performs a function of generating a signal in the form of an electrical pulse when the difference occurs .

The voltage converting unit 460 performs a function of converting a pulse signal generated in the frequency detecting unit 458 into a voltage / current component.

 The filter unit 462 performs a function of removing unnecessary noise components to restore the original photographed image signal. That is, the noise component is removed and the reconstructed final video signal is transmitted.

Therefore, it becomes possible to transmit the image photographed inside the elevator to the monitoring computer 150 in real time. Of course, infrared light that is invisible to people is used for real-time image transmission.

5 is a view illustrating a structure of a light emitting unit and a light receiving unit according to an embodiment of the present invention.

5, the light emitting unit 308 according to the embodiment of the present invention includes a first light emitting unit 510 having a visible light source that emits light in a visible band, And a second light emitting unit 520 having an invisible light source body.

The first light emitting unit 510 is used to detect whether the optical signal transmitted from the optical transmitter 120 is correctly transmitted to the optical receiver 130 when the optical transmitter 120 and the optical receiver 130 are installed in the elevator monitoring system. And emits the focus-adjusting LED light or laser light to radiate the light to the light-receiving unit 450.

The second light emitting unit 520 is provided with the optical transmitting unit 120 and the optical receiving unit 130 and the optical signal is transmitted from the optical transmitting unit 120 to the optical receiving unit 130 after all the optical focal points are adjusted. For example, infrared light, and emits the light to the light-receiving unit 450. The light-

1, the surveillance image photographed by the surveillance camera 200 in the elevator is processed through the image processing unit 110 and is transmitted to the optical transmission unit 120 from the optical transmission unit 120, Signal is transmitted to the light reception unit 130, the infrared light of the non-visible band is transmitted, so that it is invisible to people using the elevator, so that people can use the elevator with ease.

13, an outer cover is provided with transparent acrylic or the like as shown in FIG. 13 so that water or pollutants can not be injected from the outside into the optical transmitter 120 and the light receiver 130, It is possible to prevent an error from occurring. 13 is a view showing an example in which a transparent acrylic outer cover is installed in the light transmitting unit and the light receiving unit according to the embodiment of the present invention.

14, in order to increase the reception ratio of the optical signal to the optical receiver 130, a material capable of reflecting light, such as an aluminum foil, is built in and is transmitted from the optical transmitter 120 By collecting and receiving optical signals, the reception sensitivity can be increased. FIG. 14 is a view illustrating an example in which a light receiving unit according to an embodiment of the present invention incorporates a material capable of reflecting light and collects and receives optical signals.

6 is a block diagram illustrating a main structure of an optical transmitter for controlling a light emitting unit according to an embodiment of the present invention.

6, the optical transmitter 120 according to an exemplary embodiment of the present invention includes a first light emitting unit 510 and a second light emitting unit 520, For inputting a focus adjustment command of an optical signal in accordance with a state of installation at the time of installing the elevator monitoring system or for inputting a monitoring command for performing a normal monitoring operation after the elevator monitoring system is installed And further includes an operation unit 620.

That is, when the elevator monitoring system is installed, the control unit 610 is provided with the optical transmission unit 120 and the optical reception unit 130. In order to check whether the optical transmission is correctly transmitted from the optical transmission unit 120 to the optical reception unit 130 When the user inputs a focus adjustment command through the operation unit 620, the first light emitting unit 510 is operated to emit the LED light or laser light for adjusting the focus through the first light emitting unit 510, .

The control unit 610 activates the second light emitting unit 520 to emit light through the second light emitting unit 520 in a non- And emits the infrared light to the light receiving unit 450. [

Accordingly, the surveillance image photographed inside the elevator is transmitted from the optical transmission unit 120 to the optical reception unit 130 as an infrared signal, and then transmitted to the surveillance computer 150 in real time by the optical reception unit 130 as the image data.

Next, a method for maintaining such an infrared light at a certain angle and constant intensity without distortion is dealt with. The drawing showing this is shown in Fig.

7 is a view showing the light transmission angle of the light emitting unit and the light receiving angle of the light receiving unit according to the embodiment of the present invention.

The light emitting unit 308 includes the components shown in FIG. 3, but schematically includes a second light emitting unit 520 that emits an invisible light source, and a second light emitting unit 520 that emits the emitted infrared light in a non- (Not shown). Of course, the first light emitter 510 is also included, but for convenience of explanation, the second light emitter 520 will be described as an example.

The light receiving unit 450 includes components similar to those shown in FIG. 4, but schematically includes a light receiving lens 720 and a light receiving area 730 for receiving infrared light in an invisible band. Of course, the light receiving lens 720 and the light receiving area 730 also receive the LED light or the laser light in the visible band.

Here, the light emission lens 710 and the light reception lens 720 are formed of convex lenses in order to prevent scattering of optical signals. When the optical signal is originally radiated, there is a radiation angle, which usually spreads in a fan shape. In this case, since the intensity of the optical signal may become weaker as the distance increases, the receiving side can not receive the optical signal properly. Therefore, the surveillance image photographed inside the elevator 100 can not be transmitted properly.

Light emitting lenses and light receiving lenses 710 and 720 are provided in both the light emitting portion 308 and the light receiving portion 450 to reduce the radiation angle to a minimum so that the optical signal can reach the receiving side without signal distortion.

Since the block lens collects the incident light inward, the optical signal is transmitted from the light emitting unit 308 to the light receiving unit 450 while maintaining the constant angle and constant intensity.

Further, the light emitting portion 308 and the light receiving portion 450 have a screw structure, and the height can be adjusted. That is, when the cap is rotated in the clockwise direction by being coupled with the body of the light emitting unit 308 or the light receiving unit 450, the cap moves to the outside and the height thereof is raised. On the other hand, when turned counterclockwise, the cap moves inward and the height decreases. Accordingly, the intensity of the optical signal can be adjusted by changing the refraction angle of the emitted optical signal.

Therefore, it becomes possible to transmit a surveillance image photographed inside the elevator to the surveillance computer 150 in real time using an optical signal such as infrared rays. As described above, the surveillance computer 150 stores the received surveillance image or displays it on the monitor screen.

8 is a cross-sectional view of an optical transmitter according to an embodiment of the present invention.

8, the optical transmitter 120 according to an embodiment of the present invention includes a first light emitting unit 510 that emits an optical signal as light of a visible band, An optical transmitter 120 having a second light emitting unit 520 emitting light; A fixing table 810 for holding and fixing the optical transmitter 120; And a control bolt 820 inserted into each corner of the fixing table 810 to fix the optical transmitter 120 and adjust the focus of the light emitted from the first light emitting unit 510 with respect to the light of the visible band.

The optical transmitter 120 and the fixing table 810 are formed with insertion holes 830 at corners so as to correspond to each other and the adjustment bolt 820 is inserted into the insertion port 830 in a threaded manner, 120 and a fixing table 810 are seated and fixed.

12, when the optical transmitter 120 is installed on the lower outer side of the elevator 100, the magnet 1220 is provided at the lower end of the fixed base 810 on which the optical transmitter 120 is fixed, And can be fixed to the fixing bracket 1210 by a magnetic force through the magnet 1220. 12 is a view illustrating an example in which a light transmitting unit and a light receiving unit are fixedly mounted by a magnet according to an embodiment of the present invention. As shown in FIG. 12, the light receiving unit 130 may also include a magnet 1220 at the lower end of the light receiving unit 130, and may be seated to be fixed to the fixing bracket 1210 by the magnetic force.

9, the adjustment bolt 810 includes left bolts 822 and 824 for adjusting the focal point of the light of the visible band to the left as shown in Fig. 9, and a right bolt 822 and 824 for adjusting the focal point of the light of the visible band to the right The upper bolts 822 and 826 for adjusting the focal point of the light of the visible band upward and the lower bolts 824 and 828 for adjusting the focus of the light of the visible band downward, . ≪ / RTI > 9 is a view showing an example of a control bolt for adjusting focus for light of a visible band according to an embodiment of the present invention.

10, when the light of the visible band emitted from the first light emitting portion 510 is received in the right side of the light receiving portion 130, the left bolt 822 rotates in the clockwise direction, , The focus for light in the visible band is properly adjusted to the left. 10 is a view illustrating an example in which the focal point of the light of the visible band is adjusted by the adjusting bolt according to the embodiment of the present invention.

Further, when the right bolts 826 and 828 are inserted in a clockwise direction in the same manner, the focus for light in the visible band can be adjusted to the right.

In addition, when the upper bolts 822 and 826 are inserted in a clockwise direction, the focal point of light in the visible band is adjusted upward, and when the lower bolts 824 and 828 are inserted in a clockwise direction, The focus can be adjusted downward.

On the other hand, when the left bolts 822 and 824 rotate counterclockwise, the focal point for light in the visible band is adjusted to the right, and when the right bolts 826 and 828 rotate in the counterclockwise direction, Can be adjusted to the left.

When the upper bolts 822 and 826 rotate counterclockwise, the focal point of the light in the visible band is adjusted downward. When the lower bolts 824 and 828 rotate in the counterclockwise direction, Can be adjusted upward.

11 is a flowchart illustrating a method of adjusting a transmission optical focus of an elevator monitoring system according to an embodiment of the present invention.

11, in the elevator monitoring system, when a focus adjustment command is input from the operation unit 620 by the user's operation (S1110-YES), the control unit 610 controls the first light emitting unit The LED light or laser light is emitted from the light emitting unit 308 to the light receiving unit 450 through the first light emitting unit 510 in operation S1120.

At this time, the user controls the optical focus so that the optical signal is accurately transmitted to the light receiving unit 450 while viewing the LED light or the laser light of the visible band transmitted from the light emitting unit 308 to the light receiving unit 450.

Then, the adjustment bolt 820 rotates clockwise or counterclockwise, and the focus of light in the visible band is adjusted (S1130).

Then, when the focus adjustment is completed and the user inputs a focus adjustment completion command from the operation unit 620 (S91140-YES), the controller 610 ends the operation of the first light emitting unit 510, Thereby preventing light or laser light from being emitted (S1150).

The control unit 620 activates the second light emitting unit 520 to turn off the light emitting unit 308 from the light receiving unit 450 to the light receiving unit 450. [ Band infrared light is transmitted.

Therefore, the surveillance image photographed through the surveillance camera 200 in the elevator is transmitted to the light-receiving unit 450 as infrared light in an invisible non-visible band through the light-emitting unit 308, As the image is restored and transmitted to the surveillance computer 150, the optical signal is not seen in the eyes of the people using the elevator or the people watching the elevator, and people can use the elevator with peace of mind without anxiety or reluctance.

As described above, according to the present invention, a surveillance image of a situation in an elevator is transmitted as an optical signal in an invisible band, and a focal point of transmission light for an optical signal transmitted from a light- The elevator monitoring system and the transmission optical focus adjustment method thereof can be realized.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

The present invention can be applied to an elevator surveillance system that transmits a surveillance image captured in an elevator by an optical signal, and a transmission optical focus control method for controlling an optical focus by transmitting an optical signal through an LED light or laser light in a supervisory band .

100: elevator 110:
120: optical transmitter 130:
140: Terminal part 150: Surveillance computer
200: Surveillance camera 300: Signal input unit
302: Signal detection unit 304:
306: Signal conversion unit 308:
310: (optical transmission unit) power supply unit 440: (optical reception unit)
450: light receiving section 452:
454: Reference frequency generator 456: Frequency converter
458: Frequency detection unit 460: Voltage conversion unit
462: Filter part 510: First light emitting part
520: second light emitting unit 610:
620: Operation part 710: Emission lens
720: receiving lens 730: receiving area
810: Fixing base 820: Adjusting bolt
830: insertion port 1210: fixed bracket
1220: Magnet

Claims (13)

An elevator monitoring system for transmitting a surveillance image photographed in an elevator with an optical signal,
A light emitting unit including a first light emitting unit emitting the optical signal as light of a visible band and a second light emitting unit emitting light of the optical signal as light of an invisible band;
A fixture for seating and fixing the optical transmitter;
A control bolt inserted into each of the corners of the fixing table to fix the optical transmission unit and adjust a focus of light emitted from the first light emitting unit with respect to light of a visible band; And
A light receiving unit having a light receiving unit for receiving the light of the visible band or the light of the non-visible band;
Lt; / RTI >
The first light emitting unit emits light of a visible band to the light receiving unit to determine whether the optical signal transmitted from the light transmitting unit is correctly transmitted to the light receiving unit when the light transmitting unit and the light receiving unit are installed,
The second light emitting unit emits light to the light receiving unit as non-visible light to transmit an optical signal from the light transmitting unit to the light receiving unit after both the light transmitting unit and the light receiving unit are set and the optical focal point is adjusted,
Wherein the light transmitting unit and the fixing base are formed with insertion holes at respective corner portions so as to correspond to each other, the adjustment bolt is inserted into the insertion hole in a threaded manner so that the light transmission unit and the fixing base are seated and fixed, A left bolt for adjusting the focus of the light of the visible band to the left side, a right bolt for adjusting the focus of the light of the visible band to the right side, And a lower bolt for adjusting the focus of the light of the visible band downward.
delete delete The method according to claim 1,
When the left bolt is inserted in a clockwise direction, the focal point of the light of the visible band is adjusted to the left side and the focal point of the light of the visible band is adjusted to the right side when the right bolt is inserted in a clockwise direction Features elevator surveillance system.
The method according to claim 1,
When the upper bolt is inserted in a clockwise direction, the focal point of the light of the visible band is adjusted upward and the focal point of the light of the visible band is adjusted downward when the lower bolt is inserted in a clockwise direction Features elevator surveillance system.
The method according to claim 1,
When the left bolt rotates counterclockwise, the focal point of the light of the visible band is adjusted to the right side, and when the right bolt rotates counterclockwise, the focal point of the light of the visible band is adjusted to the left side. Elevator monitoring system.
The method according to claim 1,
When the upper bolt is turned counterclockwise, the focal point of the light of the visible band is adjusted downward, and when the lower bolt is turned counterclockwise, the focal point of the light of the visible band is adjusted upward. Elevator monitoring system.
The method according to claim 1,
Wherein the optical transmission unit is provided with a magnet at a lower end of the fixed base on which the optical transmission unit is fixed and the optical transmission unit is fixed to the fixed bracket by magnetic force through the magnet.
An optical transmitter including a first light emitting unit that emits an optical signal as light of a visible band and a second light emitting unit that emits the optical signal as light of an invisible band is seated and fixed to the fixed base through a control bolt, A control method for a transmission optical focus of an elevator surveillance system including a light receiving unit, an operation unit, and a control unit,
(a) inputting a focus adjustment command of the optical signal from the operation unit to the control unit;
(b) the control unit activates the first light emitting unit to emit light of a visible band through the first light emitting unit and transmit the light to the light receiving unit;
(c) a right bolt positioned on the right side of the adjusting bolt and the adjusting bolt, a left bolt positioned on the left side of the adjusting bolt, an upper bolt positioned on the upper side of the adjusting bolt, and a lower bolt positioned on the lower side of the adjusting bolt, Adjusting a focal point of the light of the visible band through the light source; And
(d) terminating the operation of the first light emitting unit when the focus adjustment completion command of the optical signal is input from the operation unit;
Lt; / RTI >
The first light emitting unit emits light of a visible band to the light receiving unit to determine whether the optical signal transmitted from the light transmitting unit is correctly transmitted to the light receiving unit when the light transmitting unit and the light receiving unit are installed,
The second light emitting unit is characterized in that both the optical transmitter and the optical receiver are provided and after the optical focal point is adjusted, the optical transmitter transmits the optical signal to the light receiver, Of the elevator monitoring system.
10. The method of claim 9,
In the step (c), when the left bolt located on the left side of the adjustment bolt turns clockwise, the focal point for the light of the visible band is adjusted to the left, and the right bolt located on the right side of the adjustment bolt is rotated clockwise The focal point of the light of the visible band is adjusted to the right side.
10. The method of claim 9,
In the step (c), when the upper bolt located on the upper side of the adjusting bolt turns clockwise, the focus of the light of the visible band is adjusted upward, and the lower bolt located below the adjusting bolt is rotated clockwise The focal point of the light of the visible band is adjusted downward.
10. The method of claim 9,
In the step (c), when the left bolt positioned on the left side of the adjusting bolt turns counterclockwise, the focus for the light of the visible band is adjusted to the right, and the right bolt located on the right side of the adjusting bolt And the focus of the light of the visible band is adjusted to the left when the light is returned in the clockwise direction.
10. The method of claim 9,
In the step (c), when the upper bolt located on the upper side of the adjusting bolt turns counterclockwise, the focal point for the light of the visible band is adjusted downward, and the lower bolt located on the lower side of the adjusting bolt And the focal point of the light of the visible band is adjusted upward when the light source returns to the clockwise direction.

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