JP2018005053A - Image projection device, control method of image projection device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image projection device capable of reducing time from a state with power cut off by high temperature to an activatable state.SOLUTION: An image projection device 10 includes: a housing 14; a light source unit 20 arranged inside the housing 14 and configured to emit light for generating an image; a first power supply part 52 configured to supply power to the light source unit 20; a temperature detection part 46 configured to detect temperature inside the housing 14; a change part 54 configured to change a relative position of an air channel through which air heated by the light source unit 20 flows and the temperature detection part 46, between a first state and a second state where the temperature detection part 46 is farther away from the air channel than in the first state; and a control part 56 configured to control the change part 54 in a state where a power supply to the first power supply part 52 is stopped, from the first state to the second state.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an image projection apparatus, a control method for an image projection apparatus, and a program.

  An image projection apparatus including a light source unit having a lamp light source is known. In the image projection apparatus, in order to keep the lamp light source and the inside of the housing within the set temperature, the inside of the housing is cooled by a fan or the like while detecting the temperature by a temperature sensor or the like. Such an image projection apparatus is configured to turn off the power when the temperature in the housing is increased by the light source unit.

  However, in the above-described image projection apparatus, the fan stops when the temperature rises and the power is turned off. In such an image projection apparatus, the heat of the light source unit is easily transmitted to the temperature sensor, and since it takes time to dissipate heat, it takes a long time to be activated. In particular, in an image projection apparatus in which the threshold value of the temperature that can be activated after the power is turned off is set higher than the threshold value of the temperature that is used to turn off the power, there is a problem that the time until the device can be activated becomes longer. is there.

  The present invention has been made in view of the above, and an object of the present invention is to provide an image projection apparatus capable of shortening the time from a power-off state to a startable state due to a high temperature.

  In order to solve the above-described problems and achieve the object, an image projection apparatus of the present invention includes a housing, a light source unit that is provided in the housing and emits light for generating an image, and power to the light source unit. A first power supply unit that supplies the temperature, a temperature detection unit that detects a temperature in the housing, a relative position of the air passage through which the air heated by the light source unit flows and the temperature detection unit, and a first state; In the state where the temperature detection unit changes in the second state farther from the air path than in the first state, and in the state where the power supply of the first power supply unit is stopped, the change unit is controlled, A control unit that switches from the first state to the second state.

  The present invention can shorten the time from when the power is turned off due to high temperature to when it can be started.

FIG. 1 is an overall perspective view of the image projection apparatus according to the first embodiment. FIG. 2 is a side view of the image projection apparatus according to the first embodiment. FIG. 3 is a perspective view of the internal configuration of the image projection apparatus. FIG. 4 is an enlarged perspective view of the light source unit and the optical engine. FIG. 5 is a cross-sectional view of the optical engine in plan view. FIG. 6 is a configuration diagram illustrating the internal configuration and control system of the image projection apparatus in the first state. FIG. 7 is a configuration diagram illustrating an internal configuration and a control system of the image projection device in the second state. FIG. 8 is a functional block diagram illustrating functions of the main control unit of the image projection apparatus. FIG. 9 is a block diagram schematically illustrating a hardware configuration of a control system of the image projection apparatus according to the first embodiment. FIG. 10 is a flowchart of power-off processing executed by the calculation unit of the main control unit. FIG. 11 is a configuration diagram illustrating an internal configuration and a control system of the image projection apparatus according to the second embodiment in the first state. FIG. 12 is a configuration diagram illustrating an internal configuration and a control system of the image projection apparatus according to the second embodiment in the second state. FIG. 13 is a flowchart of power-off processing executed by the calculation unit of the image projection apparatus according to the second embodiment. FIG. 14 is a configuration diagram illustrating an internal configuration and a control system of the image projection apparatus according to the third embodiment. FIG. 15 is a configuration diagram illustrating an internal configuration and a control system of the image projection apparatus according to the fourth embodiment in the first state. FIG. 16 is a configuration diagram illustrating an internal configuration and a control system of the image projection apparatus according to the fourth embodiment in the second state.

  Common constituent elements such as the following exemplary embodiments are denoted by common reference numerals, and redundant descriptions are omitted as appropriate.

<First Embodiment>
FIG. 1 is an overall perspective view of an image projection apparatus 10 according to the first embodiment. FIG. 2 is a side view of the image projector 10 according to the first embodiment.

  As shown in FIGS. 1 and 2, the image projection device 10 projects and displays an image generated based on image data and the like output from a personal computer, a video camera, and the like on a screen 12. A liquid crystal projector widely known as the image projection apparatus 10 has recently been improved in brightness, cost reduction, and the like due to higher resolution of a liquid crystal panel, higher efficiency of a light source lamp, and the like. A compact and light-weight image projection apparatus 10 having a DMD (Digital Micro-mirror Device) has become widespread and widely used not only in offices and schools but also at home. In particular, the front-type image projection apparatus 10 has improved portability and is used for small meetings of several people.

  The image projection apparatus 10 is required to project a large screen image (that is, to increase the size of the projection screen) and to reduce the projection space (or projection distance) required outside the image projection apparatus 10 as much as possible. ing. In recent years, the performance of optical engines has been improved, and image projection apparatuses 10 that can achieve a large screen with a projection distance of 1 to 2 m and a projection size of 60 inches to 80 inches have become mainstream. In the case of an image projection apparatus having a long projection distance, a conference desk is disposed between the image projection apparatus and the screen 12, and the image projection apparatus is installed behind the conference desk. The recent image projector 10 is disposed on the front side of the conference desk (that is, the screen 12 side) as the projection distance is shortened. As a result, the space behind the image projector 10 can be freely utilized. The image projector 10 includes a housing 14, a light source lamp housed in the housing 14, and a large number of electronic boards. Thereby, the temperature inside the housing | casing 14 of the image projector 10 rises with the heat | fever of a light source lamp with progress of time after starting. As the housing 14 of the image projection apparatus 10 is downsized, the temperature inside the image projection apparatus 10 increases more remarkably. An intake port 16 and an exhaust port 18 are formed in the housing 14 so that the temperature inside the image projector 10 does not exceed the heat resistance temperature. Thereby, the inside of the image projector 10 is cooled by the air-cooling method by forced airflow.

  FIG. 3 is a perspective view of the internal configuration of the image projector 10. FIG. 4 is an enlarged perspective view of the light source unit 20 and the optical engine 22. As shown in FIGS. 3 and 4, the image projection apparatus 10 includes a light source unit 20, an optical engine 22, an intake fan 24, and an exhaust fan 26. The light source unit 20, the optical engine 22, the intake fan 24, and the exhaust fan 26 are provided in the housing 14.

  The light source unit 20 includes, for example, a high pressure mercury lamp. The light source unit 20 irradiates the optical engine 22 with light (for example, white light) that forms an image.

  The optical engine 22 splits the light from the light source unit 20 into each color and generates an image. The optical engine 22 includes an illumination unit 30 and a projection unit 34 which will be described later.

  The intake fan 24 is provided near the intake port 16 in the housing 14. The intake fan 24 draws external air from the intake port 16 and supplies the air to the inside of the image projector 10.

  The exhaust fan 26 is provided in the vicinity of the exhaust port 18 in the housing 14. The exhaust fan 26 forcibly exhausts the air in the housing 14 that has cooled the inside of the image projection device 10 from the exhaust port 18.

  As described above, the air cooling method of the image projection apparatus 10 is implemented by the air flow from the intake port 16 to the exhaust port 18 by the intake fan 24 and the exhaust fan 26.

  FIG. 5 is a cross-sectional view of the optical engine 22 in plan view. The optical engine 22 includes a lighting unit 30, an image display unit 32, and a projection unit 34.

  The illumination unit 30 splits the white light irradiated by the light source unit 20 into RGB (that is, red, green, and blue) and guides the split light to the image display unit 32. The illumination unit 30 includes a color wheel 36, a light tunnel 38, two relay lenses 40, a plane mirror 42, and a curved mirror 44.

  The color wheel 36 is formed in a disc shape including a plurality of color filters arranged in the circumferential direction. The color wheel 36 receives the white light emitted from the light source unit 20 while rotating, thereby splitting the white light and converting it into light of each color of RGB.

  For example, the light tunnel 38 is formed in a hollow cylindrical shape in which four plate glasses are bonded together. The light tunnel 38 guides the light separated by the color wheel 36 to the two relay lenses 40 through the internal space.

  By combining the two relay lenses 40, the axial chromatic aberration of the light output from the light tunnel 38 is corrected and condensed.

  The plane mirror 42 reflects the light collected by the relay lens 40 to the curved mirror 44.

  The curved mirror 44 reflects the light reflected by the flat mirror 42 while condensing it on the image display unit 32.

  Based on the modulation signal, the image display unit 32 generates an image with the light that is split and guided by the illumination unit 30 and outputs the image to the projection unit 34. The image display unit 32 is, for example, a DMD (Digital Micro-mirror Device) that functions as a light modulation element provided inside the illumination unit 30. The image display unit 32 includes a plurality of micromirrors having a substantially rectangular mirror surface. The micromirror of the image display unit 32 reflects the received light in the direction of the projection unit 34 and the direction of the OFF light plate that absorbs light. The image display unit 32 drives each micromirror in a time-sharing manner based on the image data, thereby reflecting the light for generating an image out of the light reflected by the curved mirror 44 to the projection unit 34 to generate an image. An image is generated by reflecting unnecessary light to the OFF light plate.

  The projection unit 34 has a plurality of projection lenses. The projection unit 34 enlarges and projects the image generated by the light reflected by the image display unit 32 onto the screen 12.

  In addition, the incident side of the relay lens 40, the plane mirror 42, the curved mirror 44, the image display unit 32, and the projection unit 34 of the illumination unit 30 is held by a housing (not shown) so as to cover each component. . The mating surfaces of the housing have a dustproof structure sealed with a sealing material.

  FIG. 6 is a configuration diagram illustrating an internal configuration and a control system of the image projection apparatus 10 in the first state. FIG. 7 is a configuration diagram illustrating an internal configuration and a control system of the image projector 10 in the second state.

  As shown in FIGS. 6 and 7, the image projection device 10 includes a temperature detection unit 46, a power button 48, a ballast circuit 50, a PSU (Power Supply Unit) 52 that is an example of a first power supply unit, An air path changing unit 54, which is an example of a changing unit, and a main control unit 56, which is an example of a control unit, are further provided.

  The temperature detection unit 46 is, for example, a thermostat. The temperature detection unit 46 is disposed inside the housing 14, for example, vertically above the light source unit 20. In other words, the temperature detection unit 46 is disposed on the side opposite to the direction of gravity when viewed from the light source unit 20. Therefore, the temperature detection unit 46 is disposed on the air path AT through which the air heated by the light source unit 20 flows. The temperature detection unit 46 detects the temperature in the housing 14 and outputs temperature information related to the temperature. For example, the temperature detection unit 46 transmits a first determination result, which is a result of determining whether or not the temperature is equal to or higher than a predetermined first threshold temperature, to the PSU 52 as temperature information while the power is on. The temperature detection unit 46 transmits a second determination result, which is a result of determining whether or not the temperature is equal to or higher than the second threshold temperature in a state where the power is off, to the PSU 52 as temperature information. For example, the second threshold temperature is lower than the first threshold temperature. The temperature detection unit 46 may transmit temperature information indicating a temperature value to the PSU 52 or the main control unit 56.

  The power button 48 accepts a switching instruction to turn on / off the power from the user. The power button 48 transmits the accepted switching instruction to the main control unit 56.

  The ballast circuit 50 supplies the power received from the PSU 52 to the light source unit 20.

  The PSU 52 supplies the power received from the AC power source 92 to each component of the image projector 10. For example, the PSU 52 is connected to the light source unit via the air path changing unit 54 and the ballast circuit 50 based on the first determination result and the second determination result acquired from the temperature detection unit 46 and the control instruction from the main control unit 56. Power is supplied to 20.

  The air path changing unit 54 is disposed so that the position of the air path changing unit 54 can be changed between the temperature detecting unit 46 and the light source unit 20. The air path changing unit 54 is supported by a support member such as the housing 14 so as to be rotatable or movable. Thereby, the air path changing unit 54 changes the relative position between the air path AT through which the air heated by the light source unit 20 flows and the temperature detecting unit 46. Specifically, the air path changing unit 54 includes a ventilation position in a first state where the air path AT from the light source unit 20 to the temperature detecting unit 46 is not blocked as shown in FIG. 6, and a light source unit as shown in FIG. Rotate or move between the second state blocking position that blocks the air path AT from 20 to the temperature detection unit 46. When the power is on, the air path changing unit 54 is in the ventilation position. When the power is off, the air path changing unit 54 is in the ventilation position or the blocking position. The air path changing unit 54 includes a first state in which the temperature detecting unit 46 is close to the air path AT as shown in FIG. 6, and a temperature detecting unit 46 that is farther from the air path AT than in the first state as shown in FIG. In the two states, the relative position of the air path AT and the temperature detection unit 46 is changed. The air path changing unit 54 includes an air path switching plate 58 and a sound absorbing member 60. The air path switching plate 58 is disposed at the ventilation position in the first state, and is disposed at the blocking position between the temperature detection unit 46 and the light source unit 20 in the second state. The air path switching plate 58 is, for example, a planar metal partition plate. The air path switching plate 58 may be a partition plate other than metal. The sound absorbing member 60 is provided on the air path switching plate 58 and absorbs sound that accompanies switching of the position of the air path changing unit 54 and the like.

  The main control unit 56 is a computer, for example. The main control unit 56 governs overall control of the image projection apparatus 10. For example, the main control unit 56 projects the image by controlling the image display unit 32 and the like based on the image data acquired from the outside. The main control unit 56 controls the light source unit 20, the intake fan 24, the exhaust fan 26, and the air path changing unit 54 via the PSU 52. For example, the main control unit 56 controls the air path changing unit 54 to switch from the first state to the second state in a state where the power supply is turned off and the power supply of the PSU 52 is stopped.

  FIG. 8 is a functional block diagram showing functions of the main control unit 56 of the image projection apparatus 10. As shown in FIG. 8, the main control unit 56 of the image projection apparatus 10 includes a calculation unit 62 and a storage unit 64.

  The calculation unit 62 is a calculation processing device such as a CPU (Central Processing Unit). The calculation unit 62 includes an acquisition unit 66 and a processing unit 68. The calculation unit 62 functions as an acquisition unit 66 and a processing unit 68 by reading a program. All or part of the acquisition unit 66 and the processing unit 68 may be configured by a circuit such as an ASIC (Application Specific Integrated Circuit).

  The acquisition unit 66 acquires image data from an external device. The acquisition unit 66 acquires the determination result of the temperature detection unit 46 via the PSU 52. The acquisition unit 66 acquires a switching instruction for switching the power on and off from the power button 48. The acquisition unit 66 determines whether the power-off is due to a switching instruction from the power button 48.

  The processing unit 68 controls the light source unit 20 and the optical engine 22 based on the image data to generate and project an image. The processing unit 68 controls the light source unit 20, the intake fan 24, the exhaust fan 26, and the air path changing unit 54 via the PSU 52. For example, when the processing unit 68 turns off the power based on the switching instruction received from the power button 48, the power supply of the PSU 52 is stopped, and the light source unit 20, the intake fan 24, and the exhaust fan 26 are stopped. To do. In addition, the processing unit 68 switches the position of the air path changing unit 54 based on the determination result from the temperature detection unit 46 and the like in a state where the power is off.

  The storage unit 64 includes a random access memory (RAM), a read only memory (ROM), a hard disk drive (HDD), and a solid state drive (SSD). The storage unit 64 stores a program executed by the calculation unit 62 and parameters such as a threshold necessary for the program.

  FIG. 9 is a block diagram schematically illustrating a hardware configuration of a control system of the image projection apparatus 10 according to the first embodiment. As shown in FIG. 9, the image projection apparatus 10 according to the first embodiment includes a CPU (Central Processing Unit) 80, a RAM (Random Access Memory) 82, a ROM (Read Only Memory) 84, an HDD (Hard Disk). Drive) 86, I / F 88, and bus 90. The CPU 80, RAM 82, ROM 84, HDD 86 and I / F 88 are connected via a bus 90.

  The CPU 80 governs overall control of the image projection apparatus 10. The RAM 82 is a volatile storage medium capable of reading and writing information at high speed, and is used as a work area when the CPU 80 processes information. The ROM 84 is a read-only nonvolatile storage medium and stores programs such as firmware. The HDD 86 is a nonvolatile storage medium capable of reading and writing information, and stores an OS (Operating System), various control programs, application programs, and the like.

  The I / F 88 connects and controls the bus 90 and various hardware and networks. An intake fan 24, an exhaust fan 26, a power button 48, and a PSU 52 are connected to the I / F 88.

  The power-off program executed by the image projection apparatus 10 according to the first embodiment has a module configuration including the above-described units (the acquisition unit 66 and the processing unit 68). As actual hardware, the CPU 80 reads out and executes a power-off program from the ROM 84, whereby the above-described units are loaded onto the main storage device. Thereby, the acquisition unit 66 and the processing unit 68 are generated on the main storage device, and these functions are realized in the computer.

  For example, the power-off program executed by the image projection apparatus 10 according to the first embodiment is provided by being incorporated in advance in the ROM 84 or the like. The power-off program executed by the image projection apparatus 10 of the first embodiment is a file in an installable or executable format, and is a CD-ROM, flexible disk (FD), CD-R, DVD (Digital Versatile). It may be configured to be recorded on a computer-readable recording medium such as a disk).

  Further, the power-off program executed by the image projection apparatus 10 of the first embodiment is stored on a computer connected to a network such as the Internet and is provided by being downloaded via the network. Also good. The power-off program executed by the image projection apparatus 10 according to the first embodiment may be provided or distributed via a network such as the Internet.

  FIG. 10 is a flowchart of the power-off process executed by the calculation unit 62 of the main control unit 56. The computing unit 62 executes a power-off process by reading a power-off program. At least a part of the steps executed by the power-off program is an example of a method for controlling the image projection apparatus. In the flowchart of the power-off process, the air path changing unit 54 starts in the first state.

  As shown in FIG. 10, when the power-off process is started, the acquisition unit 66 first determines whether or not to turn off the power by operating the power button 48 (S102).

  When the acquisition unit 66 stops the PSU 52 and turns off the power without acquiring the switching instruction of the power button 48 (S102: No), the processing unit 68 executes step S106 without executing step S104. Run. The case where the power is turned off without accepting the switching instruction of the power button 48 indicates that the determination result of the temperature detection unit 46 indicates that it is outside the preset temperature, and the power source connected to the AC power source 92 Including the case where the cord is removed and the case of a power failure.

  When the acquisition unit 66 acquires the switching instruction of the power button 48 to turn off the power (S102: Yes), the processing unit 68 executes after-cooling processing (S104). Specifically, the processing unit 68 continues to drive the intake fan 24 and the exhaust fan 26 in order to cool the inside of the housing 14 for a predetermined time.

  Next, the processing unit 68 turns off the lamp of the light source unit 20 and stops the intake fan 24 and the exhaust fan 26 (S106). Note that the process of step S106 includes not only the process by the processing unit 68 but also the case where the power supply is stopped and the process is forcibly stopped and extinguished.

  The processing unit 68 determines whether or not the temperature in the housing 14 is within a predetermined first set temperature (S108). For example, the processing unit 68 determines whether the temperature in the housing 14 is within the first set temperature based on the first determination result acquired by the acquisition unit 66 from the temperature detection unit 46 via the PSU 52.

  When the first determination result acquired by the acquisition unit 66 from the temperature detection unit 46 via the PSU 52 indicates that the temperature is less than the first threshold temperature, the processing unit 68 determines that the temperature is within the first set temperature (S108: Yes). In this case, since the temperature in the housing 14 is sufficiently low, the processing unit 68 puts the image projection device 10 in a standby state (S110). The standby state is a state in which, for example, when the obtaining unit 66 obtains an instruction to switch the power button 48, the power is turned on so that the PSU 52 can supply power and start up.

  If the first determination result acquired by the acquisition unit 66 from the temperature detection unit 46 via the PSU 52 indicates the first threshold temperature or more, the processing unit 68 determines that the temperature is outside the first set temperature (S108: No). In this case, since the temperature in the housing 14 is high, the processing unit 68 determines whether or not to change the state by moving the position of the air path changing unit 54 (S112). The processing unit 68 determines that the air path changing unit 54 is switched to the cutoff position when the power supply from the outside is suddenly stopped due to, for example, pulling out the power cord or a power failure regardless of the operation of the power button 48. .

  When the processing unit 68 determines to switch the position of the air path changing unit 54 (S112: Yes), the processing unit 68 controls the air path changing unit 54 via the PSU 52, and the air path changing unit 54 is in the second state illustrated in FIG. Then, the image projection device 10 is set in a standby state (S110).

  If the processing unit 68 determines that the position of the air path changing unit 54 is not switched (S112: No), the processing unit 68 maintains the ventilation position in the first state shown in FIG. 6 without switching the position of the air path changing unit 54. It is determined whether or not the temperature detected by the temperature detector 46 is within the second set temperature (S114). For example, the processing unit 68 determines whether the temperature detected by the temperature detection unit 46 is within the second set temperature based on the second determination result acquired by the acquisition unit 66 from the temperature detection unit 46 via the PSU 52. .

  When the second determination result acquired by the acquisition unit 66 from the temperature detection unit 46 via the PSU 52 indicates the second threshold temperature or higher, the processing unit 68 determines that the temperature is outside the second set temperature (S114: No). Step S114 is repeated and the image projector 10 is not put into a standby state. Here, the second threshold temperature is lower than the first threshold temperature. Therefore, even if the temperature in the housing 14 detected by the temperature detection unit 46 is lower than the second threshold temperature that is lower than the first threshold temperature that can be in the standby state, the processing unit 68 puts the image projector 10 in the standby state. Don't make it. That is, the processing unit 68 does not put the image projection device 10 into a standby state due to a kind of malfunction of the temperature detection unit 46, and in this case, the user cannot be activated even if the power button 48 is operated.

  When the second determination result acquired by the acquisition unit 66 from the temperature detection unit 46 via the PSU 52 indicates that the temperature is less than the second threshold temperature, the processing unit 68 determines that the temperature is within the second set temperature (S114: Yes). In this case, since the temperature around the temperature detection unit 46, that is, the temperature in the housing 14 is sufficiently low, the processing unit 68 enters a standby state (S110).

  As described above, in the image projecting device 10, the processing unit 68 of the main control unit 56 changes the air path to the blocking position that blocks the air path AT from the light source unit 20 to the temperature detection unit 46 with the power off. The part 54 is arranged. Thereby, the image projector 10 can reduce the state which does not receive the switching instruction | indication of the power button 48, and can increase the condition which will be in a standby state. Thereby, although the image projection apparatus 10 may be activated, the state that cannot be activated by the user can be reduced, and the time until activation can be shortened.

Second Embodiment
FIG. 11 is a configuration diagram illustrating an internal configuration and a control system of the image projector 110 according to the second embodiment in the first state. FIG. 12 is a configuration diagram illustrating an internal configuration and a control system of the image projection apparatus 110 according to the second embodiment in the second state. In the image projector 110, the exhaust fan 26 is provided in the vicinity of the temperature detection unit 46.

  As illustrated in FIGS. 11 and 12, the image projection device 110 includes an air path changing duct 154 that is an example of a changing unit. The air path changing duct 154 is provided from the light source unit 20 to the exhaust fan 26. The air path change duct 154 is, for example, a metal duct. The air path changing duct 154 may be a duct other than a metal, for example. The air path changing duct 154 is formed in a deformable hollow cylindrical shape. One end of the air path changing duct 154 opens toward the light source unit 20. The other end of the air path changing duct 154 opens toward the exhaust fan 26. Therefore, the hollow area inside the air passage changing duct 154 becomes the air passage AT. The air path changing duct 154 includes a sponge member 155 provided in a through hole formed in the side surface so as to allow the temperature detection unit 46 to pass therethrough. The sponge member 155 is provided so as to be able to pass through the temperature detection unit 46. The sponge member 155 closes the through hole in a state where the temperature detection unit 46 has not passed.

  As shown in FIG. 11, the air passage changing duct 154 is disposed at a position including the temperature detection unit 46 in the ventilation position in the first state. Thereby, the air path change duct 154 guides the air heated by the light source unit 20 to the exhaust fan 26 through the vicinity of the temperature detection unit 46. As shown in FIG. 12, the air path changing duct 154 is arranged by being deformed to a position that does not include the temperature detection unit 46 at the shut-off position in the second state where the power is turned off. Therefore, in the air path change duct 154, the temperature detection unit 46 is closer to the air path AT than the first state as shown in FIG. 12, and the temperature detection unit 46 is closer to the air path AT as shown in FIG. In the distant second state, the relative position between the temperature detection unit 46 and the air passage AT is changed. Thereby, the air path changing duct 154 guides most of the air heated by the light source unit 20 to the exhaust fan 26 without passing through the vicinity of the temperature detection unit 46.

  FIG. 13 is a flowchart of power-off processing executed by the calculation unit 62 of the image projection apparatus 110 according to the second embodiment. Note that the same step number is assigned to the same process as the power-off process of the first embodiment, and a description thereof is omitted.

  As shown in FIG. 13, in the power-off process of the second embodiment, the processing unit 68 executes steps S102 to S106 and then the air path change duct 154 detected by the temperature detection unit 46 (that is, the casing). 14) is determined whether it is within the first set temperature (S208).

  If the processing unit 68 determines that the temperature in the air path changing duct 154 is within the first set temperature (S208: Yes), the processing unit 68 sets the image projection device 110 in a standby state (S110).

If it determines with the temperature in the air path change duct 154 not being in 1st setting temperature (S208: No), the process part 68 will determine whether the air path change duct 154 is moved (S212).
If it determines with the process part 68 changing the position of the air path change duct 154 (S212: Yes), it will move the air path change duct 154 to the interruption | blocking position of the 2nd state shown in FIG. A standby state is set (S110).

  If the processing unit 68 determines that the position of the air path change duct 154 is not changed (S212: No), the processing unit 68 maintains the ventilation position in the first state shown in FIG. 11 without changing the position of the air path change duct 154. After executing step S114, the image projection apparatus 110 is set in a standby state (S110).

<Third Embodiment>
FIG. 14 is a configuration diagram illustrating an internal configuration and a control system of the image projection apparatus 210 according to the third embodiment.

  As illustrated in FIG. 14, the image projection apparatus 210 according to the third embodiment further includes a drive unit 270 that is an example of a second power supply unit. The drive unit 270 has a rechargeable power source. The drive unit 270 may have a motor. When the PSU 52 stops supplying power, the driving unit 270 supplies power charged in the exhaust fan 26 or driving force based on the charged power for a certain period of time. As a result, the exhaust fan 26 can continue the exhaust even if the power supply from the PSU 52 or the like is stopped.

<Fourth embodiment>
FIG. 15 is a configuration diagram illustrating an internal configuration and a control system of the image projection apparatus 310 according to the fourth embodiment in the first state. FIG. 16 is a configuration diagram illustrating an internal configuration and a control system of the image projection apparatus 310 according to the fourth embodiment in the second state.

  As illustrated in FIG. 15, the image projection apparatus 310 according to the fourth embodiment includes a changing unit 354. The changing unit 354 moves the temperature detecting unit 46 relative to the air path AT. The changing unit 354 includes a housing member 358, a movable fastener 360, and a protrusion 361.

  The housing member 358 houses the temperature detection unit 46 so as to be slidable. A slide groove 359 is formed in the housing member 358. The slide groove 359 extends in the vertical direction, for example. The slide groove 359 guides the temperature detection unit 46 along the vertical direction.

  The movable fastener 360 moves between a support position in the first state shown in FIG. 15 and a retracted position in the second state shown in FIG. The movable fastener 360 supports the temperature detection unit 46 inside the upper portion of the housing member 358 at the support position in the first state. In other words, the movable fastener 360 holds the temperature detection unit 46 at a detection position in the vicinity of the air path AT that can detect the heat of the light source unit 20 at the support position. The movable fastener 360 releases the support of the temperature detection unit 46 at the retracted position in the second state. Accordingly, the movable fastener 360 moves the temperature detection unit 46 downward by gravity along the slide groove 359 of the housing member 358. That is, in the second state, the temperature detection unit 46 moves to a non-detection position that is less affected by the heat of the light source unit 20 and is farther from the air path AT than the first state.

  The protrusion 361 protrudes from the slide groove 359 and moves the temperature detection unit 46 that has moved to the non-detection position to the detection position.

  In the image projection apparatus 310 of the fourth embodiment, the main controller 56 moves the movable fastener 360 from the support position to the retracted position when the power is off. Thus, the main control unit 56 moves the temperature detection unit 46 from the detection position in the first state to the non-detection position in the second state when the power is off.

  The function, arrangement, number, shape, and the like of the configuration of each embodiment described above may be changed as appropriate. Moreover, you may combine each embodiment suitably.

  The temperature detection unit 46 may be disposed at a position other than vertically above the light source unit 20. For example, in the case where the image projection device 10 or the like is configured to be installed in any direction of 360 °, the temperature detection unit 46 is arranged vertically below the light source unit 20 or in the horizontal direction. In this case, since the temperature detection unit 46 may be affected by the heat of the light source unit 20 depending on the installation direction, the above-described effects can be obtained by applying the above-described embodiments.

  The above-described embodiments have been presented by way of example and are not intended to limit the scope of the present invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. The embodiments and modifications of the embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Image projector 14 ... Case 20 ... Light source unit 26 ... Exhaust fan 46 ... Temperature detection part 48 ... Power button 52 ... PSU
54 ... Air path change unit 56 ... Main control unit 58 ... Air path switching plate 110 ... Image projection device 154 ... Air path change duct 210 ... Image projection device 270 ... Drive unit 310 ... Image projection device 354 ... Change unit 358 ... Housing member 359 ... Slide groove 360 ... Movable fastener 361 ... Projection AT ... Air passage

JP 2011-048210 A

Claims (10)

A housing,
A light source unit that is provided in the housing and emits light for generating an image;
A first power supply unit for supplying power to the light source unit;
A temperature detector for detecting the temperature in the housing;
The relative position between the air path through which the air heated by the light source unit flows and the temperature detection unit is changed between a first state and a second state in which the temperature detection unit is farther from the air path than the first state. Change part to be
A control unit that controls the change unit to switch from the first state to the second state in a state where the power supply of the first power supply unit is stopped;
An image projection apparatus comprising: The image projection device according to claim 1, wherein the change unit includes a metal partition plate disposed between the temperature detection unit and the light source unit in the second state. The image projection device according to claim 1, wherein the changing unit includes a partition plate other than a metal plate disposed between the temperature detection unit and the light source unit in the second state. The changing unit is an air path changing duct that includes the temperature detecting unit in the first state, does not include the temperature detecting unit in the second state, and has one end opening toward the light source unit. The image projection apparatus according to claim 1. The image projection device according to claim 4, wherein the air path changing duct is made of metal. The image projection device according to claim 4, wherein the air path changing duct is made of a material other than metal. An exhaust fan for exhausting air in the housing;
A second power supply unit for supplying power charged to the exhaust fan;
The image projection apparatus according to claim 1, further comprising: The changing unit is
An accommodation member that accommodates the temperature detection unit and is formed with a groove that guides the temperature detection unit;
In the first state, the temperature detection unit is supported inside the housing member, and in the second state, the support of the temperature detection unit is released to move the temperature detection unit along the groove. When,
The image projection apparatus according to claim 1, comprising: A housing,
A light source unit that is provided in the housing and emits light for generating an image;
A first power supply unit for supplying power to the light source unit;
A temperature detector for detecting the temperature in the housing;
The relative positions of the air path through which the air heated by the light source unit flows and the temperature detection unit are set in a first state and a second state in which the temperature detection unit is farther from the air path than the first state. Change part to be changed,
In a method for controlling an image projection apparatus comprising:
Determining whether the power button is turned off;
And a step of switching the changing unit from the first state to the second state when the power supply of the first power supply unit is stopped regardless of the power button. A housing,
A light source unit that is provided in the housing and emits light for generating an image;
A first power supply unit for supplying power to the light source unit;
A temperature detector for detecting the temperature in the housing;
The relative positions of the air path through which the air heated by the light source unit flows and the temperature detection unit are set in a first state and a second state in which the temperature detection unit is farther from the air path than the first state. Change part to be changed,
In the computer of the image projection apparatus comprising:
A function to determine whether the power button is turned off;
A function of switching the changing unit from the first state to the second state when the power supply of the first power supply unit is stopped regardless of the power button;
A program that realizes

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