JP2007041220A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of restraining a cooling degree inside a device body from being changed according to a tilting position. <P>SOLUTION: The projector 1 is equipped with: a cooling fan 25 for a light source lamp; and an exhaust port 2b formed to exhaust air downward. It is equipped with: an ascending/descending mechanism whose ascending/descending position can be adjusted to a first position corresponding to a condition that a projecting angle to a horizontal direction is near the maximum projecting angle and to a second position other than the first position, and also including an ascending/descending member 33 having a pressing part 33c; a detection switch 34 capable of detecting that the ascending/descending position is adjusted to the first position and it is adjusted to the second position other than the first position, and also having a turning lever 34b pressed by the pressing part when the ascending/descending member 33 is adjusted to the first position; and a control part 41 controlling the cooling fan 25 for the light source lamp based on the first position and the second position of the ascending/descending member 33 detected by the detection switch 34. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector, and more particularly to a projector having a cooling means.

  Conventionally, a projector provided with cooling means such as a cooling fan for cooling the inside of the projector is known (for example, see Patent Documents 1 and 2).

  The projector disclosed in Patent Document 1 includes a cooling fan for cooling the light source lamp. This projector is configured not to cool the light source lamp immediately after the light source lamp is turned on. The projector is configured to cool the light source lamp with a cooling fan after the light source lamp reaches a predetermined temperature and the output of the light source lamp is stabilized.

  The projector disclosed in Patent Document 2 includes a cooling fan that is stopped in conjunction with a power switch. Specifically, when the power switch is turned off by the user, the lens group that protrudes in front of the projector is accommodated in the projector. Then, after the cooling fan is continuously driven for a predetermined time required for the liquid crystal panel, the cooling fan is automatically stopped by the control circuit. Further, this Patent Document 2 also discloses a projector in which driving of a cooling fan is continued until a predetermined cooling temperature is detected by a temperature sensor after the lens group is accommodated.

Conventionally, there is also known a projector provided with an elevating mechanism capable of adjusting the tilt of the projector in order to adjust the projection angle with respect to the horizontal direction and fixing the projector at the adjusted tilt position. In consideration of the fact that projectors equipped with this conventional lifting mechanism are often used with the projector tilted from the horizontal position by a predetermined angle, the exhaust port is set in the horizontal direction at a position tilted from the horizontal position by a predetermined angle. Thus, the exhaust direction is installed in a direction inclined downward. Thus, when the projector is installed at a predetermined angle from the horizontal position, the air is smoothly exhausted, so that the air exhaust efficiency can be improved.
JP 2003-215704 A JP 2001-242542 A

  However, in the conventional projector in which the exhaust port is directed downward, when the projector is installed horizontally, the air that is warmed and raised inside the projector flows in the direction inclined downward. The difference in angle between the exhaust port and the exhaust direction is increased. For this reason, there is a disadvantage that the exhaust efficiency of air by the cooling fan is lowered. On the other hand, when the projector is tilted at a predetermined angle so that the exhaust port is horizontal, the angle between the direction in which the air that is warmed and raised inside the projector flows and the exhaust direction of the exhaust port directed downward The difference becomes smaller. For this reason, the exhaust efficiency of the air by a cooling fan becomes large. As described above, the projector having the conventional lifting mechanism and the exhaust port being directed in the direction inclined downward has the disadvantage that the exhaust efficiency of air by the cooling fan varies depending on the inclined position of the projector. For this reason, even if the cooling fan is rotated at a constant rotation speed, the degree of cooling of the light source lamp varies depending on the tilt position of the projector, so that the life of the light source lamp may be shortened.

  Further, in the projector described in Patent Document 1, the cooling fan is controlled according to the temperature of the light source lamp, so that there is a problem that the cooling fan cannot be controlled in accordance with a change in exhaust efficiency. In the projector described in Patent Document 2, since the cooling fan is controlled to be driven for a predetermined time after the power switch is set to OFF, the cooling fan is controlled in accordance with the change in exhaust efficiency. There is a problem that can not be. As a result, even if Patent Documents 1 and 2 are applied to a projector having an elevating mechanism and the exhaust port being inclined downward, the degree of cooling of the light source lamp varies depending on the inclined position of the projector. Therefore, there arises a problem that the life of the light source lamp is shortened.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a projector capable of suppressing a change in the degree of cooling inside the apparatus main body depending on an inclined position.

  A projector according to a first aspect of the present invention includes a cooling unit that includes a cooling fan for a light source lamp and cools the inside of the apparatus main body, and an exhaust port that is formed so as to exhaust air downward. In the projector provided, it is installed at the center of the front part of the apparatus body, and is moved up and down to a first position corresponding to a case where the projection angle with respect to the horizontal direction is near the maximum projection angle and a second position other than the first position. And an elevating mechanism having an elevating member including a pressing portion, an elevating position of the elevating member adjusted to a first position corresponding to the vicinity of the maximum projection angle, and a second position other than the first position Detecting means including a detection switch having a rotation lever that is pressed by the pressing portion of the elevating member when the elevating member is adjusted to the first position. Cooling for the light source lamp of the cooling means based on both the temperature sensor for detecting the temperature inside the main body, the first and second positions of the elevating member detected by the detection switch, and the temperature detected by the temperature sensor Control means for controlling the fan, the control means of the cooling fan for the light source lamp when the elevating member is in the second position than the number of rotations of the cooling fan for the light source lamp when the elevating member is in the first position The rotational speed of the cooling fan for the light source lamp is controlled so that the rotational speed is increased.

In the projector according to the first aspect, by providing the control means for controlling the cooling means according to the inclination of the apparatus main body, when the apparatus main body is inclined, the light source of the cooling means is controlled by the control means according to the inclination of the apparatus main body. The number of rotations of the lamp cooling fan can be controlled. As a result, the cooling means can be controlled in accordance with the change in the exhaust efficiency due to the adjustment of the inclination of the apparatus body, so that it corresponds to the exhaust efficiency of the air sent by the cooling fan and exhausted by the exhaust port. The cooling fan can be controlled. Therefore, when the device main body is set to a horizontal posture other than the vicinity of the maximum projection angle or a state close to the horizontal posture, the direction in which the air that is warmed and raised inside the device main body flows and the direction in which the air is inclined downward Since the angle difference between the exhaust port formed so as to exhaust to the exhaust direction and the exhaust direction becomes large, the exhaust efficiency becomes low. In this way, when the apparatus main body is adjusted to a state where the exhaust efficiency is low, control is performed by the control means so as to increase the rotational speed of the light source lamp cooling fan. In addition, when the apparatus main body is adjusted to the vicinity of the maximum projection angle, the flow direction of the air that is heated and raised inside, and the exhaust direction of the exhaust port that is configured to exhaust the air in a downwardly inclined direction Since the angle difference between and becomes smaller, the exhaust efficiency becomes higher. In this way, when the apparatus main body is adjusted to a state where the exhaust efficiency is high, control is performed by the control means so as to reduce the rotational speed of the light source lamp cooling fan. By these, it can suppress that the cooling degree of a light source lamp changes. As a result, it is possible to suppress the life of the light source lamp from being shortened. Further, when the apparatus main body is adjusted so that the projection angle with respect to the horizontal direction is maximized, it is formed so as to exhaust air in a direction in which the air that is heated and rises inside the apparatus main body flows and in a direction in which the air is inclined downward. Since the angle difference with the exhaust port becomes smaller, the exhaust efficiency becomes higher. Thus, when the apparatus main body is tilted in a state where the exhaust efficiency is high, the power consumption by the cooling fan can be reduced by reducing the number of revolutions of the cooling fan.

  Further, the projector according to the first aspect is provided with an elevating mechanism having a pressing portion, an elevating position of the elevating member adjusted to a first position corresponding to the vicinity of the maximum projection angle, and a second position other than the first position. It is possible to detect the adjustment, and when the elevating member is adjusted to the first position, the elevating member is provided with a detection switch having a rotation lever that is pressed by the pressing portion of the elevating member. The projection angle with respect to the horizontal direction can be set, and the first position and the second position of the elevating member can be detected by the detection switch. Thereby, the control means can easily control the rotation speed of the cooling fan for the light source lamp based on the lift position of the lift member detected by the detection switch. Also, by providing the temperature sensor, the control means can control the cooling fan based on both the raising / lowering position of the elevating member and the temperature detected by the temperature sensor, so the control means is the apparatus main body detected by the temperature detection means. The cooling fan for the light source lamp can be controlled so that the temperature inside is constant, and the cooling fan can be controlled according to the tilt position of the apparatus main body. As a result, the power consumption of the cooling fan can be suppressed while maintaining the cooling efficiency.

  A projector according to a second aspect of the present invention includes a cooling means for cooling the inside of the apparatus main body, an exhaust port for exhausting air, and a control means for controlling the cooling means in accordance with the inclination of the apparatus main body. I have.

  In the projector according to the second aspect, as described above, by providing the control means for controlling the cooling means according to the tilt of the apparatus main body, when the apparatus main body is tilted, the control means according to the tilt of the apparatus main body. Thus, the cooling means can be controlled. As a result, the cooling means can be controlled in accordance with the change in the exhaust efficiency due to the adjustment of the inclination of the apparatus main body, so that it corresponds to the exhaust efficiency of the air sent by the cooling means and exhausted by the exhaust port. The cooling means can be controlled. Therefore, when the device main body is adjusted to a tilt position with low exhaust efficiency, the control means is controlled to increase the cooling capacity of the cooling means, and when the device main body is adjusted to a tilt position with high exhaust efficiency. If the control means controls the cooling means to lower the cooling capacity, it is possible to suppress the change in the degree of cooling of the light source lamp and the like inside the apparatus main body depending on the tilt position of the apparatus main body. Thereby, it can suppress that the lifetime of a light source lamp becomes short. In addition, when the apparatus main body is adjusted to an inclined position with high exhaust efficiency, the power consumption by the cooling means can be reduced by controlling the cooling means so that the cooling capacity of the cooling means is lowered.

  The projector according to the second aspect of the present invention preferably includes an elevating mechanism for adjusting the projection angle with respect to the horizontal direction, and a detecting means for detecting a predetermined elevating position of the elevating mechanism, and detecting the detecting means. Based on the result, the control means controls the cooling means. If comprised in this way, since a cooling means can be controlled by a control means based on the raising / lowering position of the raising / lowering mechanism for adjusting the projection angle with respect to the horizontal direction detected by the detection means, it can be easily horizontal. The cooling means can be controlled in accordance with the projection angle with respect to the direction (the tilt position of the apparatus main body).

The projector according to the second aspect of the present invention preferably further includes a temperature sensor for detecting the temperature inside the apparatus main body, and the control means is based on both the lift position of the lift mechanism and the temperature detected by the temperature sensor. Control the cooling means. If comprised in this way, since a cooling means can be controlled based on both the raising / lowering position of a raising / lowering mechanism and the temperature detected by a temperature sensor by a control means, a control means is the inside of the apparatus main body detected by the temperature sensor. The cooling means can be controlled so that the temperature becomes substantially constant, and the cooling means can be controlled according to the tilt position of the apparatus main body. As a result, it is possible to further suppress a change in the degree of cooling inside the apparatus.

  In the projector including the lifting mechanism and the detection unit, preferably, the cooling unit includes a cooling fan, and the exhaust port is formed so that air is exhausted in a direction inclined downward from the horizontal direction. The elevating mechanism is configured to be capable of adjusting the apparatus main body to at least a first posture and a second posture in which a projection angle with respect to the horizontal direction is directed upward from the first posture. The cooling fan is controlled so that the number of rotations of the cooling fan in the first posture is higher than the number of rotations of the cooling fan. Thus, when the exhaust port is configured to exhaust air in a direction inclined downward from the horizontal direction, in the first posture where the projection angle is closer to the horizontal direction than the second posture, Since the angle difference between the direction in which the air that is heated and rises inside the apparatus main body flows and the exhaust direction of the exhaust port increases, the exhaust efficiency of the air decreases. Thus, when the exhaust efficiency is low, the inside of the apparatus main body can be reliably cooled by increasing the number of rotations of the cooling fan. On the other hand, when the exhaust port is configured to exhaust air in a direction inclined downward from the horizontal direction, in the second posture in which the projection angle is adjusted upward from the first posture, Since the difference in angle between the warming and rising air flow direction and the exhaust port exhaust direction becomes small, the air exhaust efficiency becomes high. Thus, when exhaust efficiency is high, the power consumption of a cooling fan can be suppressed by reducing the rotation speed of a cooling fan.

  In the projector provided with the lifting mechanism and the detection means, preferably, the cooling means includes a light source lamp cooling fan, and the exhaust port is formed so that air is exhausted in a direction inclined downward from the horizontal direction. The elevating mechanism includes an elevating member installed in the vicinity of the center of the front portion of the apparatus main body, and the detecting means is adjusted such that the elevating position of the elevating member is a first position corresponding to the vicinity of the maximum projection angle; A detection switch capable of detecting that the second position other than the first position has been adjusted, and the control means cools the light source lamp when the elevating member is at the first position based on the detection result of the detection switch. The rotational speed of the light source lamp cooling fan is controlled so that the rotational speed of the light source lamp cooling fan when the elevating member is at the second position is higher than the rotational speed of the fan. As described above, when the exhaust port is configured to exhaust air in a direction inclined downward from the horizontal direction, the lift position of the lift member is adjusted to the first position corresponding to the vicinity of the maximum projection angle. Therefore, the angle difference between the direction in which the air that is warmed and raised inside the apparatus main body flows and the exhaust direction of the exhaust port inclined downward is reduced. Thereby, since the exhaust efficiency of air becomes high, the power consumption of the light source lamp cooling fan can be suppressed by lowering the rotation speed of the light source lamp cooling fan. Further, when the exhaust port is configured to exhaust air in a direction inclined downward from the horizontal direction, the lifting position of the lifting member is at a second position other than the first position corresponding to the vicinity of the maximum projection angle. The angle difference between the direction in which the air that is warmed and raised inside the apparatus main body flows and the direction in which the exhaust port is inclined downward increases. Thereby, since the exhaust efficiency of air becomes low, the cooling efficiency can be improved by increasing the rotation speed of the cooling fan for the light source lamp. As a result, the degree of cooling of the light source lamp can be kept constant to some extent regardless of the tilt position of the apparatus main body, so that the life of the light source lamp can be extended.

  In the projector including the elevating member and the detection switch, preferably, the detection switch has a rotation lever, and the elevating member moves the rotation lever of the detection switch when the elevating member is adjusted to the first position. The pressing part to press is included. If comprised in this way, if a raising / lowering member is adjusted to the 1st position corresponding to the maximum projection angle vicinity, the rotation lever of a detection switch will be pressed by the press part of an raising / lowering mechanism, and a rotation lever will be rotated. The Thereby, since the maximum projection angle is detected by the detection switch including the rotation lever, the first position of the elevating member can be detected. Further, when the rotating lever is not rotated by the pressing portion of the lifting mechanism, the second position of the lifting member can be detected. As a result, the first position and the second position of the elevating member can be easily detected.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing the overall configuration of a projector according to an embodiment of the present invention. FIG. 2 is a plan view showing the inside of the projector according to the embodiment of the present invention. FIG. 3 is a partial perspective view of the interior of the projector according to the embodiment of the present invention. FIG. 4 is an enlarged perspective view of the lifting mechanism of the projector according to the embodiment of the present invention. With reference to FIGS. 1-4, the structure of the projector 1 by one Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the frame of the projector 1 according to the present embodiment includes a front frame 2, a rear frame 3, an upper frame 4, and a lower frame 5. A lens insertion portion 2a into which a projection lens 16 for projecting an image is inserted is formed on the one end side (arrow A direction) of the front frame 2 with the upper surface and the projection direction opened. Has been. Further, as shown in FIG. 2, support legs 3a and 3b are provided at the ends of the rear frame 3 in the A direction and the B direction, respectively. The support leg 3b is configured to be adjustable in height by a screw. As shown in FIG. 2, a main switch 7 is provided on one side surface (in the direction of arrow A) of the lower frame 5.

  2, the projection mechanism of the projector 1 includes a light source lamp 10, a light pipe 11, a lens holding member 12, a mirror 13, a lens 14, a DMD (Digital Micromirror Device) element 15, A projection lens 16 and a zoom ring 17 are provided. A control board 18 that performs overall control of the projector 1 is installed in the rear part of the projector 1.

  The light source lamp 10 includes a glass bulb 10a as a light source and a reflector 10b for reflecting and condensing light emitted from the bulb 10a. The light source lamp 10 is mounted inside a box-shaped lamp case 20. The front portion of the lamp case 20 is made of LCP resin (liquid crystal polyester resin: heat resistant temperature of about 340 ° C. to about 350 ° C.), and the portion excluding the front surface portion is PPS resin (polyphenylene sulfide resin: heat resistant temperature of about 240). ° C). As shown in FIG. 3, a plurality of openings 20 a are formed on both side surfaces of the lamp case 20 so that cooling air from a cooling fan 25 described later can pass therethrough.

Further, as shown in FIG. 2, the light pipe 11 is disposed between the light source lamp 10 and the lens holding member 12 and fixed by a light pipe clip 21 on the optical path of light emitted from the light source lamp 10. Has been. The light pipe 11 has a function of shaping the light from the light source lamp 10 incident from the incident port 11a into a rectangular shape, and uniformizing and emitting the light from the output port 11b. Further, the lens holding member 12 is disposed so as to face the light source lamp 10 with the light pipe 11 interposed therebetween. A lens group (not shown) composed of a plurality of lenses for forming an image on the DMD element 15 is held by the lens holding member 12. Further, as shown in FIG. 2, the mirror 13 has a function of reflecting the light transmitted through the lens group held by the lens holding member 12 to the lens 14. The lens 14 has a function of collecting light onto the DMD element 15 reflected by the mirror 13. The DMD element 15 has a function of supplying the light transmitted through the lens 14 to the projection lens 16. The DMD element 15 has a large number of reflecting portions on the surface, and displaces the large number of reflecting portions according to an image signal to form an image depending on the presence or absence of reflected light. A printed circuit board 22 that controls the DMD element 15 is attached to the DMD element 15. A heat sink member 23 for radiating heat from the DMD element 15 is attached to the printed circuit board 22. In addition, the projection lens 16 is held by the zoom ring 17, and the magnification of the projection lens 16 is adjusted by the user rotating the operation unit 17 a of the zoom ring 17.

  In the present embodiment, as shown in FIG. 2, the cooling mechanism of the projector 1 includes a cooling fan 25 and a cooling fan 26 smaller than the cooling fan 25. The cooling fan 25 is an example of the “light source lamp cooling fan” in the present invention. Further, as shown in FIGS. 1 and 2, the front frame 2 has an exhaust port 2b for exhausting air that has cooled each part of the projector 1 oriented in a direction inclined downward from the horizontal direction. It is formed with. Further, as shown in FIG. 2, an intake port 5a for taking in air for cooling is formed on the side surface of the lower frame 5 in the direction of arrow A. Further, as shown in FIG. 2, the rear frame 3 is formed with an intake port 3c for taking in air for cooling.

  As shown in FIG. 2, the cooling fan 25 is disposed at a position adjacent to the light source lamp 10 in order to cool the light source lamp 10. This cooling fan 25 has a function of sending wind through the opening 20a (see FIG. 3) of the lamp case 20 in the direction of arrow C where the light source lamp 10 is located. The wind sent to the light source lamp 10 cools the light source lamp 10 and then passes through the opening 20a (see FIG. 3) of the lamp case 20 to the front frame 2 inclined downward from the horizontal direction. It exhausts from the exhaust port 2b. The cooling fan 26 is provided for cooling the light pipe 11 and the like. The cooling fan 26 is disposed so as to be adjacent to the direction of the arrow A of the cooling fan 25 and parallel to the direction in which the light pipe 11 extends. The cooling fan 26 has a function of sending wind in the direction of arrow D where the light pipe 11 is located. The wind sent to the light pipe 11 is configured to be exhausted from the exhaust port 2b of the front frame 2 inclined downward from the horizontal direction after the light pipe 11 is cooled.

  In the present embodiment, as shown in FIGS. 1 to 4, the lifting mechanism of the projector 1 includes a lifting switch 30, a lock member 31, a guide member 32, and a lifting member 33. Further, a detection switch 34 for detecting the elevating member 33 when the apparatus main body is set to the maximum projection angle is provided.

  As shown in FIG. 1, the lift switch 30 is provided in the arrow A direction at the front of the lower frame 5. The up / down switch 30 is configured to be pressed in the direction of arrow B. As shown in FIGS. 2 and 4, the lock member 31 has an end portion in the arrow A direction connected to the lift switch 30 and an end portion in the arrow B direction formed in a bowl shape. And the lock | rock part 31a engaged with the raising / lowering member 33 is formed in the front-end | tip part of the collar shape. The lock member 31 is always urged in the direction of arrow A by an urging member (not shown) such as a spring in order to engage the lock portion 31 a with the elevating member 33. When the lifting switch 30 is pushed in the arrow B direction by the user, the locking member 31 is also driven in the arrow B direction so that the engagement between the locking portion 31a and the lifting member 33 is released. It is configured.

  As shown in FIG. 4, the guide member 32 supports the elevating member 33 so as to be movable in the arrow H direction (upward direction) and the L direction (downward direction). As shown in FIG. 3, the guide member 32 is provided integrally with the lower frame 5. As shown in FIGS. 3 and 4, a guide hole 32 a into which the elevating member 33 is inserted is formed at the center of the guide member 32 as viewed in a plan view. A notch 32 b is formed on the side surface of the upper end of the guide member 32 in the arrow B direction.

As shown in FIG. 4, the elevating member 33 is formed with leg portions 33 a that are inserted into the guide holes 32 a of the guide member 32 so as to extend in the arrow H direction and the L direction. An engaging portion 33b having a plurality of projections and recesses with which the lock portion 31a of the lock member 31 is engaged is formed on the side surface portion in the arrow B direction of the leg portion 33a so as to extend in the arrow H direction and the L direction. . Further, in the arrow B direction at the upper end of the leg 33a, the leg 33a is moved to the maximum or close to the maximum in the arrow L direction, and the projection angle of the projector 1 with respect to the horizontal direction becomes close to the maximum value. In this case, a pressing portion 33c for operating the detection switch 34 is formed. The elevating member 33 is configured to be moved in the arrow H direction and the L direction by being guided by the guide member 32. As described above, by moving the elevating member 33 in the directions of the arrows H and L, the height of the front end portion of the projector 1 is adjusted, and the projection angle with respect to the horizontal direction is adjusted.

  The detection switch 34 has a function of detecting that the projection angle of the projector 1 with respect to the horizontal direction is in the vicinity of the maximum value and that the projection angle is not in the vicinity of the maximum value of the projection angle with respect to the horizontal direction of the projector 1. As shown in FIG. 4, the detection switch 34 includes a switch main body 34a and a rotation lever 34b. The back surface of the switch body 34 a is fixed to a support member 35 made of a sheet metal supported by the lamp case 20 with screws 36 (not shown). Further, the upper end portion 35 a of the support member 35 is provided with an engagement hole 35 b that is fitted into two boss portions 20 b installed on the upper surface portion of the lamp case 20. The rotation lever 34b is supported by the switch body 34a so as to be rotatable in the directions of arrows J and K. Then, when the elevating member 33 is moved to the maximum or close to the maximum in the direction of the arrow L, the distal end portion of the rotating lever 34b is pressed in the direction of the arrow L by the pressing portion 33c of the elevating member 33 and rotated. The tip end of the lever 34b is rotated in the direction of the arrow K and is configured to fit into the notch 32b.

  FIG. 5 is a block diagram illustrating a control configuration of the projector cooling mechanism. With reference to FIG. 5, the control configuration of the cooling mechanism of the projector 1 according to the present embodiment will be described.

  Control of the cooling mechanism of the projector 1 is configured such that the control unit 41 controls the cooling fans 25 and 26 based on the outputs of both the temperature sensor 40 and the detection switch 34. The control unit 41 is provided on the control board 18 (see FIG. 2) and has a function of performing overall control of the projector 1 such as a projection mechanism as well as a cooling mechanism. The control unit 41 includes a CPU, RAM, ROM, and the like. The temperature sensor 40 is provided at the front end portion of the control board 18 (see FIG. 2) and has a function of outputting an electrical signal corresponding to the detected temperature to the control unit 41. Based on the ON / OFF signal from the detection switch 34, the control unit 41 detects that the detection switch 34 has detected that the projector 1 is near the maximum projection angle (the detection switch 34 is in an ON state) or the projector 1 It has a function of determining whether or not it is in a state where it is near the maximum projection angle (OFF state of the detection switch 34). In addition, an electrical signal is fed back from the cooling fans 25 and 26 to the control unit 41.

  Next, the operation of the projector 1 according to the present embodiment will be described with reference to FIG. First, light from the bulb 10 a of the light source lamp 10 is collected by the reflector 10 b of the light source lamp 10. Thereafter, the condensed light is incident from the incident port 11a of the light pipe 11, and after the light is shaped into a rectangular shape, it is emitted from the output port 11b of the light pipe 11. Next, the light traveling in the direction of arrow E and transmitted through the lens group is reflected by the mirror 13. The light reflected by the mirror 13 travels in the direction of the arrow F, passes through the lens 14, and then enters the DMD element 15. Thereby, the light corresponding to the image formed by the DMD element 15 travels in the arrow G direction. Then, the light corresponding to the image is magnified by the projection lens 16 whose magnification has been adjusted by rotating the zoom ring 17 by the user and projected onto the screen.

When the projector 1 operates as described above, the cooling fan 25 and the cooling fan 26 shown in FIG. 2 are rotated, so that the air is discharged from the intake port 5a of the lower frame 5 and the intake port 3c of the rear frame 3. Is captured. A part of the taken-in air is sent in the direction of arrow C and the direction of arrow D by the cooling fan 25 and the cooling fan 26. Thereby, the light source lamp 10 and the light pipe 11 are cooled. And the air which cooled the light source lamp 10 and the light pipe 11 is exhausted from the exhaust port 2b of the front frame 2 inclined downward from the horizontal direction. Here, the control unit 41 adjusts the voltage supplied to the cooling fan 25 between 7V and 10.5V based on the detected temperature supplied from the temperature sensor 40, and sets the voltage supplied to the cooling fan 26 to 4V. The rotational speed of the cooling fans 25 and 26 is controlled by adjusting between ˜6V.

  FIG. 6 is a side view showing a state where the projector is set to the horizontal posture. FIG. 7 is a side view showing a state where the projector is set near the maximum projection angle. 8 and 9 are perspective views showing the lifting mechanism in a state where the projector is set near the maximum projection angle. Next, the operation of the cooling mechanism corresponding to the projection angle of the projector 1 will be described.

  In this embodiment, first, when the user presses the lift switch 30 shown in FIG. 1 to adjust the projection angle with respect to the horizontal direction, the lock member 31 (see FIG. 4) connected to the lift switch 30 is an arrow. It is moved in the B direction. As a result, the engagement between the lock portion 31a of the lock member 31 and the engagement portion 33b of the elevating member 33 is released, so that the elevating member 33 can freely move in the arrow H direction and the L direction. And after a user moves the raising / lowering member 33 to the arrow H direction or the L direction, by returning to the state where the raising / lowering switch 30 is not pressed, the lock part 31a of the lock member 31 and the raising / lowering member 33 are engaged again. The lifting member 33 is fixed by engaging the portion 33b. As shown in FIG. 6, since the exhaust port 2b is inclined downward from the horizontal direction, the exhaust efficiency of air from the exhaust port 2b is low when the projector 1 is adjusted to the horizontal posture. . As described above, when the projector 1 is in the horizontal posture, the detection switch 34 is in the OFF state, and therefore the control unit 41 determines that the projector 1 is at a position other than the position near the maximum projection angle. In this case, a high voltage (for example, 10.5 V) is supplied from the control unit 41 to the cooling fan 25 so as to increase the degree of cooling of the light source lamp 10 by the cooling fan 25. Note that not only the horizontal posture but also the posture other than the vicinity of the maximum projection angle is set, the same control as the above-described horizontal posture is performed. Thereby, the cooling fan 25 blows air to the light source lamp 10 at a high rotational speed. As shown in FIG. 7, when the projector 1 is adjusted to the vicinity of the maximum projection angle, the rotation lever 34b is rotated in the arrow K direction by the pressing portion 33c of the elevating member 33, and the detection switch 34 is Turns on. In this case, the control unit 41 determines that the projector 1 is near the maximum projection angle. In the case of the position near the maximum projection angle, as shown in FIG. 7, the exhaust port 2b is almost horizontal, so that the exhaust efficiency is increased. For this reason, the control part 41 reduces the voltage supplied to the cooling fan 25, and supplies a low voltage (for example, 7V-10V) to the cooling fan 25. FIG. As a result, the cooling fan 25 blows air to the light source lamp 10 in a state where the rotational speed is reduced. The maximum projection angle is an example of the “second posture” in the present invention, and the other projection angles are examples of the “first posture” in the present invention.

  In the present embodiment, as described above, by providing the control unit 41 that controls the cooling fan 25 according to the tilt of the projector 1, when the projector 1 is tilted, the control unit 41 cools the projector 1 according to the tilt of the projector 1. The fan 25 can be controlled. Thus, the cooling fan 25 can be controlled in accordance with the change in the exhaust efficiency due to the adjustment of the inclination of the projector 1, so that the exhaust efficiency of the air sent by the cooling fan 25 and exhausted by the exhaust port 2b is increased. The cooling fan 25 can be controlled correspondingly.

For example, when the projector 1 is adjusted to a projection angle other than the vicinity of the maximum projection angle, the exhaust port is formed so as to exhaust air in a direction in which the air that is warmed and rises inside the projector 1 flows and in a direction inclined downward. The angle difference from the exhaust direction of 2b becomes large, and the exhaust efficiency becomes low. Thus, when the exhaust efficiency is low, the controller 41 controls the rotational speed of the cooling fan 25 to be high. Further, when the projector 1 is adjusted to a projection angle close to the maximum projection angle, the air outlet 2b is formed so as to exhaust the air flowing in a direction inclined downward and the flowing direction of the air heated and raised inside the projector 1. The difference in angle with the exhaust direction becomes smaller, and the exhaust efficiency becomes higher. As described above, when the exhaust efficiency is high, the controller 41 controls the rotation speed of the cooling fan 25 to be low. As a result, the change in the degree of cooling of the light source lamp 10 can be suppressed. As a result, it is possible to suppress the life of the light source lamp 10 from being shortened. On the other hand, when the projector 1 is adjusted to the vicinity of the maximum projection angle, the flow direction of the air that is warmed and raised inside the projector 1 and the exhaust direction of the exhaust port 2b that is configured to exhaust the air in a downwardly inclined direction. Since the angle difference between and is small or parallel, the exhaust efficiency is high. In this way, when the exhaust efficiency is high, the power consumption by the cooling fan 25 can be reduced by lowering the rotational speed of the cooling fan 25.

  In the present embodiment, the elevating member 33 is provided, and the detection switch 34 capable of detecting the state in which the elevating member 33 is adjusted so that the projector 1 reaches the maximum projection angle and the other states are provided. Thus, the control unit 41 can easily control the number of rotations of the cooling fan 25 based on the lift position of the lift member 33 detected by the detection switch 34. Further, by providing the temperature sensor 40, the control unit 41 can control the rotation speed of the cooling fan 25 based on both the detected temperature of the temperature sensor 40 and the detected position of the detection switch 34. Thereby, the control unit 41 can control the cooling fan 25 so that the temperature inside the projector 1 detected by the temperature sensor 40 becomes constant, and controls the cooling fan 25 according to the tilt position of the projector 1. can do. As a result, it is possible to further suppress a change in the degree of cooling inside the apparatus.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, an example in which the detection switch 34 capable of detecting only two types of projection angles, that is, the vicinity of the maximum projection angle of the projector 1 and a projection angle other than the vicinity of the maximum projection angle has been described. Not limited to this, a detection device capable of detecting three or more types of projection angles of the projector may be provided. Then, the supply voltage to the cooling fan may be set based on the three or more types of projection angles.

  In the above embodiment, the cooling fan 26 is controlled only by the temperature detected by the temperature sensor 40. However, the present invention is not limited to this, and the cooling fan 26 is also detected by the temperature sensor and the projection of the projector. Control may be based on both angles.

1 is a perspective view showing an overall configuration of a projector according to an embodiment of the present invention. 1 is a plan view showing the inside of a projector according to an embodiment of the present invention. It is a partial perspective view of the inside of the projector by one Embodiment of this invention. It is an expansion perspective view of the raising / lowering mechanism of the projector by one Embodiment of this invention. It is a block diagram explaining the structure of control of the cooling mechanism of a projector. It is a side view which shows the state which the projector is set to the horizontal attitude | position. It is a side view which shows the state which the projector is set to the maximum projection angle vicinity. It is a perspective view which shows the raising / lowering mechanism in the state in which the projector is set to the vicinity of the maximum projection angle. It is a perspective view which shows the raising / lowering mechanism in the state in which the projector is set to the vicinity of the maximum projection angle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 2b Exhaust port 10 Light source lamp 25 Cooling fan 33 Elevating member 33c Press part 34 Detection switch 34b Rotating lever 40 Temperature sensor 41 Control part

Claims (7)

In a projector including a cooling means for cooling the inside of the apparatus main body including a cooling fan for a light source lamp, and an exhaust port formed to exhaust air in a direction inclined downward,
Installed in the center of the front part of the main body of the device, the elevation position can be adjusted to the first position corresponding to the case where the projection angle with respect to the horizontal direction is near the maximum projection angle and the second position other than the first position. And an elevating mechanism having an elevating member including a pressing portion,
It is possible to detect that the elevating position of the elevating member has been adjusted to the first position corresponding to the vicinity of the maximum projection angle, and that the elevating member has been adjusted to a second position other than the first position. Detection means including a detection switch having a rotation lever that is pressed by the pressing portion of the elevating member when adjusted to the first position;
A temperature sensor for detecting the temperature inside the device body;
Control means for controlling the cooling fan for the light source lamp of the cooling means based on both the first position and the second position of the elevating member detected by the detection switch and the temperature detected by the temperature sensor. ,
The control means is configured such that the number of rotations of the cooling fan for the light source lamp when the lifting member is at the second position is higher than the number of rotations of the cooling fan for the light source lamp when the lifting member is at the first position. A projector that controls the number of revolutions of the cooling fan for the light source lamp so as to increase. A cooling means for cooling the inside of the apparatus body;
An exhaust port for exhausting air;
And a control means for controlling the cooling means in accordance with the inclination of the apparatus main body. A lifting mechanism for adjusting the projection angle with respect to the horizontal direction;
Detecting means for detecting a predetermined lifting position of the lifting mechanism,
The projector according to claim 2, wherein the control unit controls the cooling unit based on a detection result of the detection unit. A temperature sensor for detecting the temperature inside the device body;
4. The projector according to claim 2, wherein the control unit controls the cooling unit based on both a lift position of the lift mechanism and a temperature detected by the temperature sensor. 5. The cooling means includes a cooling fan,
The exhaust port is formed so that air is exhausted in a direction inclined downward from the horizontal direction,
The elevating mechanism is configured to be capable of adjusting the apparatus main body to at least a first posture and a second posture in which a projection angle with respect to a horizontal direction is directed upward from the first posture,
The projector according to claim 3, wherein the control unit controls the cooling fan so that the number of rotations of the cooling fan in the first posture is higher than the number of rotations of the cooling fan in the second posture. . The cooling means includes a light source lamp cooling fan,
The exhaust port is formed so that air is exhausted in a direction inclined downward from the horizontal direction,
The elevating mechanism includes an elevating member installed near the center of the front portion of the apparatus main body,
The detection means is a detection switch capable of detecting that the raising / lowering position of the raising / lowering member has been adjusted to a first position corresponding to the vicinity of the maximum projection angle and that the raising / lowering position has been adjusted to a second position other than the first position. Including
The control means is configured based on the detection result of the detection switch when the elevating member is in the second position rather than the rotational speed of the light source lamp cooling fan when the elevating member is in the first position. The projector according to claim 3, wherein the number of revolutions of the light source lamp cooling fan is controlled such that the number of revolutions of the light source lamp cooling fan is increased. The detection switch has a rotation lever,
The projector according to claim 6, wherein the elevating member includes a pressing portion that presses a rotation lever of the detection switch when the elevating member is adjusted to the first position.

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