JP2016080853A - Image projection device and method for controlling image projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the unintended actuation of the overheat prevention means of a light source.SOLUTION: A projector 100 includes a lamp 16 which radiates light and a thermostat 20 which is arranged in the vicinity of the lamp 16 and stops the lighting of the lamp 16, when reaching a predetermined temperature. A plurality of thermostats 20 are provided with respect to the lamp 16. The projector 100 further includes installation state selection means which selects the installation state of the projector 100 and overheat prevention selection means which selects the validated thermostat 20 from the plurality of thermostats 20 by the installation state selected by the installation state selection means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image projection apparatus and a method for controlling the image projection apparatus.

  Projectors widely known as image projection devices are widely used for presentations, conferences, signage, etc. for large numbers of people, as well as higher resolution of liquid crystal panels, improved brightness with higher lamp efficiency, and lower cost. Etc. are progressing.

  In addition, compact and lightweight image projection devices using DMD (Digital Micro-mirror Device) have become widespread, and these image projection devices are widely used not only in offices and schools but also at home. In addition, development of a short focus type image projection apparatus in which the projection distance to the screen is shortened.

  Various lamps are used as the light source of the image projection apparatus, and lamps (arc lamps) using arc discharge such as high-pressure mercury lamps are widely used. Since the lamp being lit becomes extremely hot, if the lamp temperature rises excessively for some reason, there is a risk that the lamp will be damaged.

  Therefore, there is known an overheat protection technique in which a thermostat is provided as a means for preventing overheating near the lamp, and when the lamp temperature reaches an allowable upper limit temperature, the lamp is forcibly stopped by operating the thermostat. .

  For example, Patent Document 1 includes lamp protection means (thermostat) for stopping lamp operation when the lamp temperature reaches an allowable upper limit temperature, and lamp temperature detection means (thermistor) for detecting the lamp temperature. There has been disclosed a projector that maintains the temperature of a lamp in a predetermined temperature range lower than an allowable upper limit temperature by controlling a voltage applied to the lamp based on a temperature detected by a thermistor.

  The projector of Patent Document 1 controls the voltage applied to the lamp based on the lamp temperature in order to prevent the occurrence of a situation where the image projection is interrupted even when the image is projected for a long time, The temperature of the lamp is maintained within a predetermined range.

  However, in the image projection apparatus that performs overheat protection with a conventional thermostat as described in the above-mentioned patent document, the thermostat may operate in an unintended situation depending on the installation state at the time of projection of the image projection apparatus. .

  In other words, the usage of the image projection device is various, and other than the usage method of projecting onto a front screen from a state placed on a flat installation surface such as a table, for example, the projection lens is directed downward or upward There are also usage methods of arranging and projecting onto the screen, and projecting onto the floor or desk. In general, the image projection apparatus controls the lamp temperature to be within an allowable range by changing the number of rotations of a fan for cooling the lamp according to the installation state.

  Depending on the installation state of the image projection apparatus, the thermostat may be positioned above the lamp in the vertical direction. Even in such a case, the temperature of the lamp and thermostat is controlled so as to be within an allowable range during normal operation. For example, if an unexpected power interruption occurs, the lamp is turned off but the fan is also stopped. As a result, cooling may be insufficient.

  In such a case, even if the temperature of the lamp itself is within the allowable range, the thermostat located above the lamp may operate beyond the allowable temperature range due to the heat of the lamp rising. there were. As described above, when the thermostat is operated, it takes time to return, so there is a problem that it takes some time until the next power can be turned on.

  Accordingly, the present invention has a plurality of light source overheating prevention means, and selects an overheating prevention means to be used according to the installation state of the image projection apparatus, thereby preventing an unintended operation of the overheating prevention means. An object is to provide an apparatus.

  In order to achieve such an object, an image projection apparatus according to the present invention includes a light source that emits light, and an overheat prevention unit that is disposed in the vicinity of the light source and stops lighting of the light source when a predetermined temperature is reached. An installation state selected by the installation state selection unit, and an installation state selection unit that selects an installation state of the image projection device. Thus, an overheat prevention selecting means for selecting the effective overheat prevention means from a plurality of the overheat prevention means is provided.

  According to the present invention, it is possible to prevent an unintended operation of the overheat preventing means of the light source.

It is a block diagram which shows the structure of a projector. It is a block diagram (1) which shows the structure around the lamp | ramp where the several thermostat was connected. It is explanatory drawing which shows the relationship between the installation state of a projector, and the thermostat to be used. It is a flowchart of an installation state selection process. It is a block diagram (2) which shows the structure around the lamp | ramp where the several thermostat was connected. It is explanatory drawing which shows the relationship between the installation angle of a projector, and the thermostat to be used.

  Hereinafter, a configuration according to the present invention will be described in detail based on the embodiment shown in FIGS.

[First Embodiment]
An image projection apparatus (projector 100) according to the present embodiment includes a light source (lamp 16) that emits light, and an overheat prevention unit that is disposed in the vicinity of the light source and stops lighting of the light source when a predetermined temperature is reached. (Thermostat 20), an image projection apparatus comprising a plurality of overheat prevention means for the light source (first thermostat 20a, second thermostat 20b) and an installation state selection means for selecting an installation state of the image projection apparatus (System control unit 3) and overheat prevention selection means (system control unit 3, power supply unit 18, relay) for selecting an effective overheat prevention means from a plurality of overheat prevention means according to the installation state selected by the installation state selection means SW19). In addition, the code | symbol in embodiment and the example of application are shown in a parenthesis.

  FIG. 1 is a block diagram showing a configuration of a projector 100 which is an embodiment of an image projection apparatus according to the present invention.

  The projector 100 includes a video signal control unit 1, a remote control reception unit 2, a system control unit 3, a memory 4, an input terminal 5, a main body operation unit 6, a fan control unit 7, a fan 8, a DMD control unit 9, and a color wheel control unit 10. , A lamp control unit 11, a projection lens 13, a DMD 14, a color wheel 15, a lamp 16, a power supply unit 18, a thermostat 20, and the like, and an image projection apparatus that projects an image on a screen 200. Moreover, the remote control 17 as a remote control means is provided.

  The system control unit 3 performs overall control of the projector 100. Also, image processing such as scaling processing for the input video signal and various other controls are performed. Also, it functions as an installation state selection unit that performs processing for selecting the installation state of the projector 100 and an overheat prevention selection unit that performs processing for selecting a thermostat to be used according to the installation state of the projector 100. In addition, the video signal control unit 1, the remote control receiving unit 2, the memory 4, the main body operation unit 6, the fan control unit 7, the DMD control unit 9, the color wheel control unit 10, and the lamp control unit 11 are connected. Control the functional part.

  The input terminal 5 is an interface for inputting a video signal, and is a VGA (Video Graphics Array) input terminal such as a D-Sub connector, an HDMI (High-Definition Multimedia Interface) (registered trademark) terminal, an S-VIDEO terminal, an RCA. Video input terminals such as terminals. A video signal is received from a video supply device such as a computer or AV equipment via a cable connected to the input terminal 5. In some cases, a plurality of input terminals 5 may be provided.

  The video signal control unit 1 processes the video signal input to the input terminal 5, and performs various processes such as serial-parallel conversion and voltage level conversion on the video signal. It also has a signal determination function that analyzes the resolution and frequency of the video signal.

  The memory 4 stores data in image processing and other various processing on the video signal. Further, the relationship between the attitude (installation state, installation angle) of the projector 100 and the thermostat to be used is stored. As the memory 4, for example, a nonvolatile semiconductor memory such as an EPROM, an EEPROM, or a flash memory can be employed.

  The main body operation unit 6 is an interface for operating the projector 100 and accepts various operation requests from the user. When accepting the operation request, the main body operation unit 6 notifies the system control unit 3 of the operation request. The main body operation unit 6 includes operation keys (operation buttons) provided on the outer surface of the projector 100.

  The remote control receiver 2 receives an operation signal from the remote controller 17. When receiving the operation signal, the remote control receiving unit 2 notifies the system control unit 3 of the operation signal.

  The user can perform various settings by operating the main body operation unit 6 or the remote controller 17. For example, a display instruction for a menu screen, selection of the installation state of the projector 100, a request to change the aspect ratio of the projection image, a request to turn off the projector 100, a request to change the lamp power to change the light amount of the lamp 16, and the image quality of the projection image ( A video mode change request for changing the brightness, standard, natural, etc.), a freeze request for stopping the projected image, and the like can be executed.

  The fan 8 includes an intake fan, an exhaust fan, a cooling fan, and the like. By discharging the outside air sucked from the intake fan from the exhaust fan, an air flow is generated in the projector 100 and air cooling is performed. Further, a cooling fan as a light source cooling unit is provided in the vicinity of the lamp 16, and the rotation amount of the cooling fan is controlled based on the temperature of the lamp 16.

  The fan control unit 7 controls the fan 8 so that the temperature in the projector 100 and the temperature of the lamp 16 become a predetermined temperature.

  The lamp 16 as a light source is, for example, a high-pressure mercury lamp that emits light from a luminescent substance by a discharge between a pair of electrodes. The lamp control unit 11 controls on / off of the lamp 16 and lighting power.

  The light emitted from the lamp 16 is split into light that repeats each color every unit time by the disk-shaped color wheel 15.

  The color wheel control unit 10 controls the rotational drive of the color wheel 15.

  The light emitted from the color wheel 15 is condensed on the DMD 14 as an image display element via a light tunnel and an illumination optical system (relay lens, plane mirror, and concave mirror).

  The DMD 14 has a substantially rectangular mirror surface composed of a plurality of micromirrors, and each micromirror is driven in a time-sharing manner based on video data, thereby processing and reflecting the projection light so as to form a predetermined video. This is an image display element. Further, the DMD control unit 9 controls on / off of the micromirror of the DMD 14.

  Based on the video data in a time division manner, the DMD 14 reflects light used by the plurality of micromirrors to the projection lens 13 and discards light to the OFF light plate. The light to be used is reflected to the projection lens 13, and the image light enlarged through the projection lens 13 is enlarged and projected onto the screen 200.

  The power supply unit 18 is connected to each device in the projector 100, converts AC (alternating current) power input from an outlet or the like into DC (direct current), and supplies power to each device in the projector 100.

  The thermostat 20 is connected to the power supply unit 18 and installed at a position close to the lamp 16. The projector 100 includes a plurality of thermostats 20. In addition, although this embodiment demonstrates the example provided with the two thermostats 20a of the 1st thermostat 20a and the 2nd thermostat 20b, if the number of thermostats is two or more, the number of installation will not be restricted.

  The thermostat 20 operates when the temperature of the lamp 16 reaches the allowable upper limit temperature, specifically, when the temperature measured by the detection unit of the thermostat 20 exceeds a predetermined temperature. When the thermostat 20 operates, the power supply from the power supply unit 18 to each device including the lamp 16 is forcibly stopped.

  FIG. 2 is a block diagram showing a main configuration of the projector 100 around the lamp to which the plurality of thermostats 20a and 20b are connected.

  The first thermostat 20 a and the second thermostat 20 b and the power supply unit 18 are connected via a relay switch (hereinafter, relay SW) 19.

  The first thermostat 20 a and the second thermostat 20 b are both installed at a position close to the lamp 16. At this time, the first thermostat 20a and the second thermostat 20b are arranged so that one of them is not physically positioned above the lamp 16 regardless of the posture in which the projector 100 is installed. For example, at the time of normal installation, the two thermostats 20 can be installed at positions facing each other with the lamp 16 interposed therebetween, such as being installed at a position sandwiching the lamp 16 in the vertical direction or the horizontal direction.

  The projector 100 according to the present embodiment can select a thermostat to be used by controlling the relay SW 19 according to the attitude of the projector 100. The relay SW 19 is controlled by the system control unit 3 based on the selected installation state of the projector 100.

  Here, when the relay SW 19 has been selected to use the first thermostat 20a, when the temperature of the selected first thermostat 20a reaches the allowable upper limit temperature, the relay SW 19 operates from the power supply unit 18 to the lamp 16. The power supply to each device including is forcibly stopped. On the other hand, even if the temperature of the second thermostat 20b selected not to be used by the relay SW 19 reaches the allowable upper limit temperature, the power supply is not forcibly stopped.

  Therefore, no matter what posture the projector 100 is installed, by enabling the thermostat 20 on the side not located above the lamp 16, the thermostat 20 operates in an unintended situation and supplies power. Can be forcibly stopped.

  FIG. 3 is an explanatory diagram showing the relationship between the attitude (installation state) of the projector 100 and the thermostat 20 to be used.

  The memory 4 stores in advance the relationship of the thermostat 20 to be used depending on the installation state of the projector 100. At this time, it is defined that the thermostat 20 that is not located above the lamp 16 is selected for each installation state.

  In the present embodiment, the installation state of the projector can be selected by the user operating the main body operation unit 6 or the remote controller 17. The system control unit 3 selects a thermostat to be used according to the installation state of the selected projector.

  FIG. 4 is a flowchart of an installation state selection process for selecting the installation state of the projector 100. First, an installation state selection menu is displayed by operating the main body operation unit 6 or the remote controller 17. From the installation state selection menu, the current installation state of the projector 100 is selected (S100).

  At this time, if the selected installation state has changed from the previous installation state (S101: Yes), the thermostat 20 to be used is selected by the control of the relay SW19 (S102). In addition, even if it is a case where an installation state is changed, the thermostat 20 to be used may be changed and may not be changed.

  On the other hand, if the selected installation state is the same as the previous installation state (S101: No), the installation state selection process ends as it is. Thereby, when the installation state of the projector 100 is selected, the thermostat 20 to be used is also selected. This installation state selection menu may be displayed when the projector 100 is turned on, or may be read from the menu screen when the user changes the installation state.

  As described above, the projector 100 according to the present embodiment includes a plurality of thermostats 20 (first thermostat 20a and second thermostat 20b) as means for preventing overheating of the lamp 16, and the thermostat 20 is set according to the projector 100 installation state. , And the thermostat 20 on the side not located above the lamp 16 is made effective so that the thermostat 20 can be prevented from operating in an unintended situation such as an unexpected power failure. It can be prevented that it takes a while until it can be introduced.

[Second Embodiment]
Hereinafter, other embodiments of the image projection apparatus according to the present invention will be described. In addition, the description about the same point as the said embodiment is abbreviate | omitted suitably.

  FIG. 5 is a block diagram showing a main configuration of the projector 100 around the lamp to which a plurality of thermostats 20a and 20b are connected. FIG. 6 is an explanatory diagram showing the relationship between the attitude (installation angle) of the projector 100 and the thermostat 20 to be used.

  As shown in FIG. 5, the projector 100 according to the present embodiment includes an angle sensor 21 that is an angle detection unit that detects an installation angle of the main body of the projector 100.

  In the memory 4, the relationship of the thermostat 20 to be used is stored in advance according to the installation angle of the projector 100. At this time, it is specified that the thermostat 20 that is not located above the lamp 16 is selected for each installation angle.

  In the present embodiment, the system control unit 3 selects the thermostat 20 to be used based on the installation angle of the projector 100 detected by the angle sensor 21, and controls the relay SW 19 so that the selected thermostat 20 is effective. Is.

  According to the projector 100 according to the present embodiment, the thermostat 20 to be used can be selected from the installation angle of the projector 100 detected by the angle sensor 21, and the process of selecting the installation state by the user is unnecessary, saving labor. In addition, it is possible to prevent an installation state selection error or forgetting to set.

  The above-described embodiment is a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above embodiment, an image projection apparatus using DMD as an image display element has been described as an example. However, as an image display element, liquid crystal (Liquid crystal display (LCD)) or reflective liquid crystal (Liquid crystal on silicon (LCOS) is used. (Registered trademark)), the present invention can be applied.

  Each unit of the system control unit 3 can be configured by causing the image projection apparatus to execute software (control program) executed by the CPU of the system control unit 3, for example.

DESCRIPTION OF SYMBOLS 1 Video signal control part 2 Remote control receiver 3 System control part 4 Memory 5 Input terminal 6 Main body operation part 7 Fan control part 8 Fan 9 DMD control part 10 Color wheel control part 11 Lamp control part 13 Projection lens 14 DMD
15 Color wheel 16 Lamp 17 Remote control 18 Power supply unit 19 Relay SW
20 thermostat 20a first thermostat 20b second thermostat 21 angle sensor 100 projector 200 screen

JP 2006-301228 A

Claims (6)

A light source that emits light;
In an image projection apparatus comprising: an overheat preventing unit that is disposed in the vicinity of the light source and stops lighting of the light source when a predetermined temperature is reached.
With a plurality of the overheat prevention means for the light source,
Installation state selection means for selecting the installation state of the image projection apparatus;
Overheating prevention selection means for selecting the overheating prevention means to be effective from a plurality of the overheating prevention means according to the installation state selected by the installation state selection means;
An image projection apparatus comprising: A light source that emits light;
In an image projection apparatus comprising: an overheat preventing unit that is disposed in the vicinity of the light source and stops lighting of the light source when a predetermined temperature is reached.
With a plurality of the overheat prevention means for the light source,
Angle detection means for detecting the inclination of the image projection device;
An overheat prevention selection means for selecting the overheat prevention means to be effective from a plurality of the overheat prevention means according to the installation angle of the image projection apparatus detected by the angle detection means;
An image projection apparatus comprising:   The plurality of overheating prevention means are provided in a position where at least one of the overheating prevention means is not positioned vertically above the light source, regardless of the installation angle of the image projection apparatus. The image projection apparatus according to claim 1, wherein the image projection apparatus is characterized.   The image according to any one of claims 1 to 3, wherein the plurality of overheat prevention means are a first overheat prevention means and a second overheat prevention means provided at positions facing each other with the light source interposed therebetween. Projection device.   The image projection apparatus according to claim 3, wherein the overheat prevention selection unit selects the overheat prevention unit that is not positioned above the light source in a vertical direction. A light source that emits light;
An overheating prevention means that is disposed in the vicinity of the light source and stops the lighting of the light source when a predetermined temperature is reached, and a control method for an image projection apparatus comprising:
The image projection apparatus includes a plurality of the overheat prevention means for the light source,
A control method for an image projection apparatus, wherein a process of selecting an effective overheat prevention means from a plurality of the overheat prevention means is performed according to an installation state or an installation angle of the image projection apparatus.

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