KR100923264B1 - Apparatus to protect overheating of projector and method thereof - Google Patents

Abstract

The present invention relates to a projector overheating prevention system and method for preventing the projector from being heated by sensing light and ambient temperature generated from the projector.

A system for preventing overheating of a projector mounted in a housing case that is lifted and lowered by a housing provided in a ceiling and outputting an image, wherein the overheat prevention system of the projector is configured to detect light intensity for detecting the intensity of light output from the projector. part; A position detecting unit detecting a distance between an upper end of the housing and the projector; A temperature sensor configured to detect an ambient temperature of the projector; And a central processor connected to the light detector, the position detector, and the temperature detector, and terminates the operation of the projector when the at least one detector detects a change over a preset reference value. Including, there is an effect that can be prevented from overheating the projector by forcibly shutting down the projector when the temperature generated by the light generated by the projector and the internal heat of the projector rises above the preset time and temperature.

Projector, lifter, light, temperature, overheat, fire, sensor

Description

System for preventing overheating of projector and its method {Apparatus to protect overheating of projector and method

The present invention relates to a system and method for preventing overheating of a projector, and more particularly, to prevent the projector from being overheated by the heat of light generated from the projector when the projector is in operation and accommodated in a storage place such as a ceiling. The present invention relates to a system for preventing overheating of a projector and a method thereof.

Background Art In general, a projector is a device for displaying an image by projecting an image based on image data input from a computer or various image reproducing apparatuses to an external screen or the like as a projection or projection apparatus of an image. Such a projector generates modulated light indicating an image obtained by modulating image data on a spatial light modulation means, specifically, a liquid crystal panel or a DMD (Digital Micromirror Device), based on the image data. And modulate the generated modulated light to an external screen or the like.

These projectors are widely used in corporations and public institutions, such as meetings and presentations, by eliminating the hassle of conventional OHP devices, and projecting various materials in PC on the screen on a large screen. It is mainly used for watching movies in small theaters and cafes.

There are many kinds of such projectors, but there are PRT type projectors and LCD type projectors according to the type of devices that produce images. At this time, the PRT type projector uses high-performance PRT (same as the CRT used for TV) to project the screen. It is composed of three projection lenses and is used for A / V only because the image quality is expressed naturally and vividly. .

In addition, LCD projectors use LCDs for displaying screens. In recent years, LCD projectors are being used in schools, government offices, and businesses because their size is getting smaller, their brightness is brighter, and their compatibility with PCs is excellent.

Such a projector is mainly installed on a conference table or pedestal or fixed to the ceiling by using a support, which is protruded to the outside when not in use to effectively utilize the space, and there is a risk of being damaged by external shocks. In addition, theft of a protruding and fixed projector frequently occurs.

In order to solve this problem, a method of storing the inside of the ceiling is used in consideration of the prevention of theft and aesthetics according to the high-end interior facilities of the room.

Hereinafter, the lift of the projector according to the prior art will be described with reference to the related drawings.

1 is a cross-sectional view of a projector lift according to the prior art, FIG. 2 is a longitudinal cross-sectional view of the projector lift according to the prior art, and FIG. 3 is a longitudinal cross-sectional view of the projector lift descending according to the prior art.

First, as shown in FIGS. 1 and 2, the projector lift includes a housing 10 that is largely embedded in the ceiling, a motor m installed to one side of the housing 10 to generate a driving force, and the motor ( m) is connected to the rotation axis (ms) and one end is connected to the rotation axis (ms) and integrally connected to the rotation axis (ms) and wound or unrolled band wire (w) and the projector (p) inside It is mounted and is connected to the other end of the band wire (w) is configured to the case 20 is lifted and lowered, and the folding connector 30 for stably maintaining the lifting operation of the case 20.

In the projector lift configured as described above, the motor m generates the driving force in the forward and reverse directions, and the rotation shaft ms rotates integrally. As a result, the band wire w is placed on the rotation shaft ms. Coiling or unwinding

At this time, when the band wire (w) is released, as shown in Figure 3, the case 20 is made to fall, the case 20 at this time is supported by the folding connector 30 in the horizontal direction By preventing the flow to the inside, it is possible to prevent the projector p mounted therein from being moved by the raising and lowering thereof.

When the case 20 is lowered to achieve a fully exposed state from the housing 10, the projector p is also exposed to the outside, so that the screen 20 is installed on a screen (not shown) installed in front of the projector p. It can be displayed by projecting an image.

On the other hand, when the pair of band wires (w) is wound on the rotation axis (ms), the case 20 makes the lifting in the ceiling direction, the lifting operation of the case 20 is the case 20 The reverse of the descent operation of. However, the folding connecting body 30 is contracted in the vertical direction while taking a form in which the overall width is widened when the case 20 is elevated.

However, the projector lift according to the prior art configured as described above has the following problems.

If you want to shut down the projector for a while due to the need to proceed with the lecture using the concentration of students or other attached materials while the lecture is in progress using the projector in the place where the projector lift is mounted As the time taken by more than a few minutes until the projector lifts without lifting the operation of the projector is accommodated in the ceiling housing (10). At this time, when the projector p is kept in the operating state and is accommodated in the housing 10, the temperature inside the case 20 is increased by the light generated from the projector p and the heat generated inside the projector p. When the projector p operates in the housing 10, the temperature inside the raised case 20 is not discharged to the outside so that the projector p may overheat, thereby causing the projector p itself or There was a problem that the internal circuit is damaged or the life of the projector (p) lamp is shortened and a fire occurs.

The present invention has been made to solve the above problems, the projector overheating prevention system for preventing the projector from overheating by the self-heating and light generated from the projector when the projector is accommodated in the housing of the ceiling in operation state and the The purpose is to provide a method.

A system for preventing overheating of a projector mounted in a housing case that is lifted and lowered by a housing provided in a ceiling and outputting an image, wherein the overheat prevention system of the projector is configured to detect light intensity for detecting the intensity of light output from the projector. part; A position detecting unit detecting a distance between an upper end of the housing and the projector; A temperature sensor configured to detect an ambient temperature of the projector; And a central processor connected to the light detector, the position detector, and the temperature detector, and terminates the operation of the projector when the at least one detector detects a change over a preset reference value. Including, there is an effect that can be prevented from overheating the projector by forcibly shutting down the projector when the temperature generated by the light generated by the projector and the internal heat of the projector rises above the preset time and temperature.

In this case, the central processing unit terminates the operation of the projector when light is detected by the light detecting unit for a predetermined time or more. When the temperature is detected by the temperature detecting unit, the projector is detected. Characterize the end of the operation.

The light sensing time of the light sensing unit may be measured from the time when the position sensing unit detects that the projector is accommodated in the ceiling.

In particular, it is connected to the central processing unit, the sound sensing unit for detecting the noise and the sound output unit for outputting an alarm sound, wherein the central processing unit, the light is detected by the light sensor for a predetermined time or more time Or when a temperature higher than or equal to a predetermined temperature is detected by the temperature detector, a sound output signal for detecting an alarm and outputting an alarm sound through the sound detector is transmitted to the sound output unit.

In this case, when the noise is not detected by the sound sensor, the central processing unit may terminate the operation of the projector to prevent the projector from overheating, thereby preventing damage and fire thereof.

In addition, the projector overheating prevention method according to the present invention for achieving the above object comprises the steps of: a) detecting that the projector is raised and received inside the housing; b) sensing light and ambient temperature output from the projector when the projector is housed inside a housing; And c) terminating the operation of the projector when the ambient temperature of the projector is higher than a preset temperature. At this time, in step a) it is characterized in that the projector is accommodated in the housing using the position sensor.

In addition, in step b), the light sensor and the temperature sensor are used to sense light and the ambient temperature. In step c), the projector is output from the projector for a predetermined time or more after being accommodated. And when light is detected, terminating the operation of the projector.

In particular, in the step b), after the projector is accommodated further comprises detecting the ambient noise when the light is detected for a time or more than a predetermined time or a temperature above a predetermined temperature inside the housing is detected. .

At this time, if the ambient noise is detected at the time more than the preset time, a warning sound is output, and if the noise is not detected at the time more than the preset time, the operation of the projector is terminated to prevent overheating of the projector, thereby preventing its damage and fire. Can be prevented.

The projector overheat prevention system and method thereof according to the present invention detect a temperature of light generated from the projector and a time when the projector is accommodated when the projector is accommodated in a storage place such as a ceiling housing while the projector is operating, and exceeds the preset temperature or time. In this case, by forcibly terminating the operation of the projector, it is possible to prevent the projector from overheating, thereby preventing the damage and the fire of the projector.

Specific technical configurations and operational effects of the projector overheat prevention system and method of the present invention will be clearly understood by the following detailed description with reference to the drawings showing preferred embodiments of the present invention.

Example  One

Hereinafter, a projector overheat prevention system and method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram illustrating a projector overheat prevention system according to a first embodiment of the present invention, and FIGS. 5 and 6 illustrate operations of a projector lifter equipped with a projector overheat prevention system according to a first embodiment of the present invention. It is a cross section.

First, as shown in FIG. 4, the overheat prevention system 200 according to the first embodiment of the present invention includes a light detector 240 for detecting the intensity of light output from the projector 300, a ceiling, and the projector. Position projector 250 for detecting the distance from the 300, the temperature sensor 260 for detecting the ambient temperature of the projector, and the signal received from the detection unit 240, 250, 260 is applied to the projector The control unit 300 includes a central processing unit 210 and first and second interface units 220 and 230 connected to the projector 300.

Here, the first and second interface units 220 and 230 are connected to the central processing unit 210, and a signal applied from the outside to control the projector 300 is provided through the first interface unit 220. Received and transmitted to the central processing unit 210 and the signal processed from the central processing unit 210 is received through the second interface unit 230 and transmitted to the projector 300.

The light detector 240 is connected to the central processing unit 210, and when the projector 300 is accommodated in the ceiling, the light detector 240 detects the intensity of light generated therefrom and the light generated from the projector 300 is detected. In this case, the first detection signal S1 is transmitted to the central processing unit 210. In particular, the light detector 240 preferably detects light generated from the projector 300 using a light sensor.

In addition, the position detection unit 250 is connected to the central processing unit 210, and detects the distance between the ceiling and the projector 300, the center when the projector 300 is accommodated in the housing 310 in the ceiling The second detection signal S2 is transmitted to the processor 210. In this case, the position detecting unit 250 may detect whether the ceiling of the projector 300 is accommodated by detecting the distance between the projector 300 and the upper end of the housing 310 using the position detecting sensor. .

The temperature sensor 260 is connected to the central processor 210, and when the projector 300 is accommodated in the housing 310, a third detection signal that senses an ambient temperature of the projector 300 ( S3) is transmitted to the central processing unit 210. In particular, the temperature detector 260 preferably detects a temperature around the projector 300 using a temperature sensor.

In addition, the central processing unit 210 is connected to the first and second interface units 220 and 230, the light sensing unit 240, the position sensing unit 250, and the temperature sensing unit 260. If any one or more of the detection units 240, 250, and 260 detect a change over a preset reference value, the control signal C1 for terminating the operation of the projector 300 is output.

In particular, the reason for detecting the light generated from the projector 300 and the ambient temperature thereof is that, when the projector 300 is accommodated in the housing 310 of the ceiling, the received space is very small but the light generated from the projector 300. The overheating itself has a constant temperature, so that when the light and self-heating state continue, the ambient temperature rises and the elevated temperature is prevented from being discharged to the outside in the space of the housing 310 accommodated. Since the projector 300 may be damaged and a fire may be generated by the projector 300, the projector 300 detects whether the light is generated and the ambient temperature after confirming that the projector 300 is accommodated in the housing 310.

As shown in FIGS. 5 and 6, the projector overheat prevention system 200 having such a configuration is mounted on any one side of the inner side of the housing 310 fixedly coupled to the ceiling where the projector 300 is accommodated. By detecting the position of the 300 and the ceiling, light and ambient temperature generated therefrom, the projector 300 is forcibly shut down to prevent overheating and fire.

For example, the projector 300 is fully exposed from the housing 310 by lowering the connecting body 330 coupled to both sides of the housing case 320 which fixes the projector 300 so as not to be separated. When the position detection unit 250 of the projector overheat prevention system 200 detects this, and transmits that the projector 300 is not accommodated to the central processing unit 210. Accordingly, the projector overheat prevention system 200 does not sense the light and the ambient temperature by recognizing that the projector 300 is not overheated or a fire does not occur due to the light and the ambient temperature generated from the projector 300. Do not.

In addition, when the connector 330 is raised and lowered in the direction of the arrow, the position detecting unit 250 detects that the projector 300 is accommodated in the ceiling as shown in FIG. 6 and measures time from the detected time point. The light detector 240 and the temperature detectors 240 and 260 detect the light generated from the projector 300 and the ambient temperature to increase the temperature around the projector 300 by the heat of the light. By forcibly terminating the operation of the projector 300 before the 300 is damaged or a fire occurs, there is an advantage of preventing damage caused by an elevated temperature and generation of a fire.

Example  2

The projector overheat prevention system 200 according to the second embodiment of the present invention will be described with reference to FIGS. 4 to 6 and 7. However, the description of the same parts as those of the second embodiment of the configuration of the first embodiment will be omitted, and only the configuration that is different from the second embodiment will be described in detail.

7 is a block diagram illustrating a projector overheat prevention system according to a second embodiment of the present invention.

As shown in FIG. 7, the projector overheat prevention system 200 according to the second embodiment of the present invention includes a central processing unit 210, first and second interface units 220 and 230, and a light sensing unit 240. ), The position sensing unit 250, the temperature sensing unit 260, the sound sensing unit 270, and the sound output unit 280.

Here, the sound detector 270 is connected to the central processing unit 210, the noise is detected by detecting the noise of the place (for example, lecture room, conference room, etc.) where the projector overheat prevention system 200 is provided. If so, the fourth detection signal S4 is transmitted to the central processing unit 210. In this case, the time when the sound detection unit 270 detects the ambient noise, the light continuously generated and the rising temperature after the position detection unit 250 confirms that the projector 300 is accommodated in the ceiling. It is time point exceeding set time and temperature.

The central processor 210 may include the first and second interface units 220 and 230, the light detector 240, the position detector 250, the temperature detector 260, the sound detector 270, and the sound. The sound output signal (out) connected to the output unit 280, for outputting a warning sound corresponding to the fourth detection signal (S4) that detects the noise from the sound detection unit 270 is applied to the sound output Transfer to section 280.

In addition, the sound output unit 280 is connected to the central processing unit 210, the sound output when the central processing unit 210 receives the fourth detection signal (S4) from the sound detection unit 270. The signal (out) is applied to output a corresponding warning sound. In this case, the warning sound may use a buzzer sound or a sound recorded by a human voice so as to notify the user that a fire may occur because the projector 300 is currently accommodated in the ceiling in an operating state.

As described above, when noise is detected by the sound detection unit 270, it is determined that the projector 300 has been accommodated on the ceiling by another use during lectures or meetings, and outputs a warning sound for notifying the user thereof. By doing so, the user may recognize this, and the projector lift may be lowered to continue or end the lecture or meeting.

At this time, if there is no action in the projector 300 within a predetermined time after the warning sound is output from the sound output unit 280, the control to forcibly terminate the operation of the projector 300 in the central processing unit 210 Output the signal C1.

If the noise is not detected by the sound detector 270, it may be generated by forcibly terminating the operation of the projector 300 by determining that there is no user in the place where the projector 300 is provided. There is an effect that can prevent damage to the projector 300 and fire.

Hereinafter, a method of preventing a projector overheat by using the projector overheat prevention system 200 having the above configuration will be described in detail with reference to FIGS. 4 to 7 and 8 described above.

8 is a flowchart sequentially illustrating a method for preventing overheating of a projector according to the present invention.

First, as shown in FIG. 8, it is detected that the projector 300 is lifted and accommodated in the ceiling (S410). In this case, whether the ceiling of the projector 300 is accommodated is detected by the position detecting unit 250. The position detecting unit 250 preferably uses a position detecting sensor.

When the projector 300 is accommodated in the ceiling and sensed by the position detecting unit 250, the projector 300 detects light generated from the projector 300 and its ambient temperature (S420). At this time, the reason for detecting the light generated from the projector 300 and the ambient temperature is that, when the projector 300 is accommodated on the ceiling, the received space is very small, but the light generated from the projector 300 has a constant temperature If the light generation condition continues, the ambient temperature rises and the elevated temperature is not discharged to the outside from the accommodated space, thereby causing the projector 300 to be damaged by the elevated temperature, thereby causing a fire. In order to prevent this, the projector 300 detects whether the light is generated and the ambient temperature after confirming that the projector 300 is accommodated in the ceiling.

In particular, if the light is continuously generated for a predetermined time by measuring the time from the time when the projector 300 is accommodated, it is determined that there is a risk of fire, thereby forcibly terminating the operation of the projector 300. Accordingly, damage and fire risk of the projector 300 can be prevented.

In addition, the sensor 300 not only measures the detection time of the light but also detects the temperature continuously rising by the light, and when the temperature exceeds the preset temperature within the preset time, the operation of the projector 300 is forcibly terminated ( S430). In this case, it is preferable that the light is sensed using a light sensor and the ambient temperature is detected using a temperature sensor.

On the other hand, after the projector 300 is accommodated, the user of the projector 300 forgets that the projector 300 is accommodated in the ceiling at the moment when the detection time of the light exceeds the preset time and the detected temperature exceeds the preset temperature. In order to check whether it is thrown away, ambient sound is sensed through the sound sensor 270.

In this case, when noise is detected by the sound detector 270, the user of the projector 300 forgets to accept the projector 300 and determines that a lecture or a meeting is in progress to inform the sound output unit ( 280 outputs a warning sound.

In particular, if there is no action on the projector 300 within a predetermined time after the warning sound is output, the operation of the projector 300 is forcibly terminated to prevent damage and fire by heat.

If the noise is not detected by the sound detector 270, the user of the projector 300 forgets to accept the projector 300 and determines that the user has moved to another place, so that the projector 300 is immediately without any action. ) Is forcibly terminated.

Preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and various substitutions, modifications, and changes within the scope of the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It will be appreciated that such substitutions, changes, and the like should be considered to be within the scope of the following claims.

1 is a cross sectional view of a projector lift according to the prior art;

2 is a longitudinal sectional view of a projector lift according to the prior art;

3 is a longitudinal sectional view of the projector lift descending according to the prior art;

4 is a block diagram showing a projector overheat prevention system according to a first embodiment of the present invention.

5 and 6 are cross-sectional views showing the operation of the projector lifter with a projector overheat prevention system according to the first embodiment of the present invention.

7 is a block diagram showing a projector overheat prevention system according to a second embodiment of the present invention.

8 is a flowchart sequentially illustrating a method for preventing overheating of a projector according to the present invention.

<Description of Symbols for Major Parts of Drawings>

200: projector overheat protection system

210: central processing unit 220: first interface unit

230: second interface unit 240: light detecting unit

250: position detection unit 260: temperature detection unit

270: sound detection unit 280: sound output unit

300: projector 310: housing

320: housing case 330: connector

Claims (14)

In the system for preventing overheating of the projector which is mounted in the housing case that is raised and lowered to the housing provided on the ceiling and outputs an image, The overheat prevention system of the projector, A light detector detecting the intensity of light output from the projector; A position detecting unit detecting a distance between an upper end of the housing and the projector; A temperature sensor configured to detect an ambient temperature of the projector; And It is connected to the light detector, the position detector, and the temperature detector, and when the light detector, the position detector, and the temperature detector detects a change over a preset reference value or is preset by the light detector and the temperature detector. When the sensor detects a change over a reference value or when the position sensor and the temperature sensor detect a change over a preset reference value, or when the light sensor and the position sensor detect a change over a preset reference value, the projector operates. Central processing unit for terminating the; Overheat prevention system of the projector comprising a. The method of claim 1, And the central processing unit terminates the operation of the projector when light is detected by the light sensing unit for a predetermined time or more. The method of claim 1, And the central processing unit terminates the operation of the projector when a temperature higher than a preset temperature is detected by the temperature sensing unit. The method of claim 1, The light sensing time of the light sensor is measured from the time when the position sensor detects that the projector is accommodated in the ceiling, overheat prevention system of the projector. The method of claim 1, And a sound output unit connected to the central processor and configured to output a sound detection unit for detecting noise and an alarm sound. The method of claim 5, The central processing unit outputs an alarm sound by detecting a noise through the sound sensing unit when light is sensed by the light sensing unit for a predetermined time or more or when a temperature higher than a predetermined temperature is detected by the temperature detecting unit. The overheat prevention system of the projector characterized by transmitting an output signal to the said sound output part. The method of claim 6, And the central processing unit terminates the operation of the projector when noise is not detected by the sound detection unit. a) detecting that the projector is lifted and received inside the housing; b) sensing light and ambient temperature output from the projector when the projector is housed inside a housing; And c) terminating operation of the projector when the ambient temperature of the projector is higher than a preset temperature; Projector overheat prevention method comprising a. The method of claim 8, The projector overheating prevention method, characterized in that for detecting the projector is accommodated in the housing using the position sensor in the step a). The method of claim 8, And b) detecting the light and the ambient temperature using a light sensor and a temperature sensor in step b). The method of claim 8, And c), terminating the operation of the projector when the light output from the projector is detected for a predetermined time or more after the projector is accommodated. The method of claim 8, In the step b), after the projector is accommodated further comprises detecting the ambient noise when the light is detected for a predetermined time or more than a predetermined time or more than a predetermined temperature. The method of claim 12, The projector overheating prevention method, characterized in that for outputting a warning sound when the ambient noise is detected more than the predetermined time. The method of claim 12, The method of preventing overheating a projector, characterized in that the operation of the projector is terminated when noise is not detected at a predetermined time or more.

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