JP6284010B2 - Light source device and image projection device - Google Patents

Description

  The present invention relates to a light source device and an image projection device.

  As the light source device, there is known a light source device used for a projector (image projection device) that projects a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen.

Patent Document 1 discloses a light source device including a discharge lamp as a light source, a reflector that is provided so as to surround a light emitting portion of the discharge lamp, and that reflects light emitted from the light emitting portion, and a cooling device that cools the light emitting portion. Is described.
FIG. 18 is a cross-sectional view showing the light source device 200 described in Patent Document 1. As shown in FIG.
As shown in FIG. 18, a discharge lamp 207 as a light source is provided at the bottom of a mortar-shaped reflector 208. A duct member 215 is attached to the opening edge of the reflector. The duct member 215 has a first wall portion 215b extending in parallel with the optical axis H from an attachment portion 215a attached to the opening edge of the reflector. Moreover, it has the 2nd wall part 215c extended toward the optical axis H from the light travel direction downstream end part of the 1st wall part 215b. The end of the second wall 215c on the optical axis side is closer to the optical axis than the opening edge of the reflector. Further, a third wall portion 215d is provided so as to face the first wall portion 215b from the optical axis side end portion of the second wall portion 215c. The length of the third wall portion 215d is shorter than the first wall portion 215b.

  The duct member 215 holds a disc-shaped rotating plate 216 having an open center so as to be rotatable. Specifically, the opening of the rotating plate 216 is fitted into the third wall portion 215 d with play, and the rotating plate 216 is rotatably held by the duct member 215. Thereby, the rotating plate 216 is opposed to the second wall portion 215c of the duct member 215, and is surrounded by the rotating plate 216, the first wall portion 215b, the second wall portion 215c, and the third wall portion 215d. A space S is formed, and air for cooling the discharge lamp 207 flows in the space S as described later.

FIG. 19 is a perspective view showing the light source device 200 with the duct member 215 removed.
As shown in FIG. 19, the rotary plate 216 is provided with a notch-shaped ejection port 217. A weight 218 is fixed to the rotating plate 216 with an interval of 180 ° in the rotating direction of the rotating plate 216. For example, when the projector is rotated about an axis parallel to the optical axis of the light source device, and the installation angle of the projector (the tilt angle of the projector with respect to the horizontal plane) is changed, the rotating member 216 acts by the gravity of the weight 218. Thus, the weight 218 is rotated relative to the duct member 215 so that the weight 218 continues to be positioned below the discharge lamp 207. As a result, even if the installation angle of the projector is changed, the jet outlet 217 provided at an interval of 180 ° in the rotation direction of the rotary plate 216 with respect to the weight 218 is positioned above the discharge lamp 207. . As a result, the spout 217 can be positioned above the light emitting portion 207a of the discharge lamp regardless of the orientation of the projector.

  Air taken in from a cooling fan (not shown) flows through a space S formed by the duct member 215 and the rotating plate 216, and as indicated by an arrow 214 in FIG. 18, the jet outlet 217 above the light emitting unit 207a. And then hits the upper part of the light emitting part 207a. Thereby, the upper part of the light emission part 207a whose temperature becomes higher than a lower part can be cooled by the relationship of the convection of the air in a reflector, etc.

  However, in the light source device 200 described in Patent Document 1, the rotating plate 216 is changed depending on the surface state of the rotating plate 216 or the surface state of the third wall portion 215d that is a contact portion that contacts the rotating plate 216 of the duct member 215. And the third wall portion 215d may have a large static frictional force. In that case, when the projector is tilted, the static frictional force is superior to the weight of the weight 218, the rotating plate 216 cannot rotate relative to the duct member 215, and the ejection port 217 is positioned above the light emitting unit 207a. Can not be located in. As a result, there is a problem that air may not be applied to the upper part of the light emitting unit 207a.

  The present invention has been made in view of the above problems, and the object thereof is to rotate the rotating member satisfactorily, so that the jet outlet can be reliably connected to the light emitting portion regardless of the posture of the apparatus. It is an object to provide a light source device and an image projection device that can be positioned above.

  In order to achieve the above object, the invention of claim 1 includes a light source and a cooling device that cools the light source by blowing air from an outlet of a rotating member that is rotatably held. In the light source device, the moving member may include the holding portion that holds a weight at a position different from the ejection port in the rotation direction of the rotation member so that the ejection port is positioned above the light source. The portion is characterized in that the weight is held so as to be movable within a predetermined range in the rotating direction of the rotating member.

  According to the present invention, it is possible to reliably position the ejection port above the light emitting unit regardless of the posture of the projector.

1 is an external perspective view showing a projector and a projection surface according to an embodiment of the present invention. FIG. 2A is a perspective view of the inside of the projector as viewed from the front side of FIG. FIG. 2B is a perspective view of the inside of the projector viewed from the back side of FIG. Explanatory drawing which shows the optical path from a projector to a projection surface. The perspective view of the optical engine part and light source part which were provided in the inside of a projector. The perspective view which shows the optical system component accommodated in the illumination part, and a light modulation part. The perspective view which shows an illumination part, a 1st projection optical system, and a light modulation part. The perspective view which shows a 2nd projection optical system with a 1st projection optical system, an illumination part, and a light modulation part. The perspective view which shows the optical path from a 1st optical system to a projection surface (screen). FIG. 3 is an external perspective view of the projector with an exterior cover removed. The figure explaining the installation attitude | position of a projector. Sectional drawing which shows the conventional light source cooling device. The schematic block diagram of the light source part of this embodiment. The exploded sectional view of a wind direction mechanism. The perspective view of a rotation member. The figure which shows the mode of a wind direction mechanism when a projector is installed with the attitude | position of previous FIG.10 (b). The figure which shows the mode of a wind direction mechanism when a projector is installed with the attitude | position of previous FIG.10 (c). The figure which shows the mode of a wind direction mechanism when a projector is installed with the attitude | position of previous FIG.10 (d). Sectional drawing which shows the conventional light source device. The perspective view which shows the conventional light source device of the state which removed the duct member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the overall configuration of an image projection apparatus to which the light receiving device according to the present invention can be applied will be described.
FIG. 1 is an external perspective view showing a projector 1 as an image projection apparatus and a projection surface 2 such as a screen according to an embodiment of the present invention. In the following description, as shown in FIG. 1, the normal direction of the projection surface 2 is the X direction, the minor axis direction (vertical direction) of the projection surface is the Y direction, and the major axis direction (horizontal direction) of the projection surface 2 is. Let it be the Z direction.

  The projector is a device that forms a projection image based on image data input from a personal computer, a video camera, or the like, and projects and displays the projection image P on a projection surface 2 such as a screen. In particular, liquid crystal projectors have recently been improved in terms of high resolution and low price due to high resolution of liquid crystal panels, high efficiency of light sources (lamps), and the like. In addition, small and light projectors 1 using DMD (Digital Micro-mirror Device), which is a micro-drive mirror device, have become widespread, and projectors 1 are widely used not only in offices and schools but also at home. . Front-type projectors have improved portability and are now being used for small meetings of several people. Such a projector is required to be able to project a large screen image (increasing the projection surface) and to make the “projection space required outside the projector” as small as possible. As will be described later, in the projector 1 according to the present embodiment, the transmission optical system such as a projection lens is set in parallel with the projection surface 2, and the light beam is folded by the folding mirror, and then the light beam is projected by the free-form mirror to the projection surface 2. And is configured to be enlarged and projected. With this configuration, it is possible to reduce the size of the optical engine unit in a vertical three-dimensional manner.

  A dust-proof glass 51 from which the light flux of the projection image P is emitted is provided on the upper surface of the projector 1, and the light flux that has passed through the dust-proof glass 51 is projected onto the projection surface 2. Further, on the upper surface of the projector 1, an operation unit 183 is provided for the user to operate the projector 1. A focus lever 33 for adjusting the focus is provided on the side surface of the projector 1.

FIG. 2 is an internal perspective view of the inside of the projector 1 with the main body cover removed. 2A is a perspective view of the inside of the projector 1 viewed from the front side of FIG. 1, and FIG. 2B is a perspective view of the inside of the projector 1 viewed from the back side of FIG. FIG. 3 is an optical path diagram from the projector 1 to the projection surface 2.
The projector 1 includes an optical engine unit 100 and a light source unit 60 having a light source that emits white light. The optical engine unit 100 includes an image forming unit 101 serving as an image forming unit that forms an image using light from a light source, and a projection optical unit configured to project a light beam of an image formed by the image forming unit 101 onto the projection surface 2. 102.

  The image forming unit 101 folds the light from the light source 10 having a DMD 12 that is a micro-drive mirror device having a large number of micro mirrors that can be driven so as to change the tilt of the reflecting surface, and irradiates the DMD 12 with light. The illumination unit 20 is used. The projection optical unit 102 includes a first projection optical system 30 including a coaxial optical system 70 including at least one transmissive refractive optical system and having a positive power, a folding mirror 41, and a curved surface having a positive power. The second projection optical system 40 having a mirror 42 is used.

  The DMD 12 emits light from the light source by the illumination unit 20 and modulates the light emitted by the illumination unit 20 to generate an image. The optical image generated by the DMD 12 is projected onto the projection surface 2 via the optical system 70 of the first projection optical system 30, the folding mirror 41 and the curved mirror 42 of the second projection optical system 40.

FIG. 4 is a perspective view of the optical engine unit 100 and the light source unit 60 provided in the projector 1.
As shown in FIG. 4, the light modulation unit 10, the illumination unit 20, the first projection optical system 30, and the second projection optical system 40 that constitute the optical engine unit 100 are the images of the projection surface 2 and the projection image P. Of the directions parallel to the surface, they are arranged side by side in the Y direction in the figure. A light source unit 60 as a light source device is arranged on the right side of the illumination unit 20 in the drawing. In the figure, reference numeral 27 denotes an OFF light plate.

  The light source unit 60 includes a light source bracket 62, and a discharge lamp 61 such as a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp as a light source is mounted on the light source bracket 62. A light source holder 64 as a holding member holding the reflector 63 and the like is screwed to the light emission side (the other end side in the longitudinal direction of the light source unit 60) of the discharge lamp 61 above the light source bracket 62. In addition, a light source supply port 64 b into which air for cooling the arc tube of the discharge lamp 61 flows is provided on the side surface of the light source holder 64.

FIG. 5 is a perspective view showing the optical system components housed in the illumination unit 20 and the light modulation unit 10.
The illumination unit 20 includes a color wheel 21, a light tunnel 22, two relay lenses 23, a cylinder mirror 24, and a concave mirror 25. The color wheel 21 has a disk shape and is fixed to the rotating portion of the color motor 21a. The color wheel 21 is provided with filters such as R (red), G (green), and B (blue) in the rotation direction. The light L from the light source unit 60 reaches the peripheral end of the color wheel 21. The light that reaches the peripheral end of the color wheel 21 is separated into R, G, and B light in a time-sharing manner by the rotation of the color wheel 21.

The light separated by the color wheel 21 enters the light tunnel 22. The light tunnel 22 has a rectangular tube shape, and the inner peripheral surface thereof is a mirror surface. The light that has entered the light tunnel 22 is reflected by the inner peripheral surface of the light tunnel 22 a plurality of times, is converted into a uniform surface light source, and is emitted toward the relay lens 23.
The light passing through the light tunnel 22 passes through the two relay lenses 23, is reflected by the cylinder mirror 24 and the concave mirror 25, and is focused on the image generation surface of the DMD 12 to form an image.

  The light modulation unit 10 includes a DMD board 11 on which a DMD 12 is mounted. The DMD 12 is mounted on a socket 11 a provided on the DMD board 11 with an image generation surface on which micromirrors are arranged in a lattice shape facing upward. The DMD board 11 is provided with a drive circuit for driving the DMD mirror. A heat sink 13 as a cooling means for cooling the DMD 12 is fixed to the back surface of the DMD board 11 (the surface opposite to the surface on which the socket 11a is provided).

  A plurality of movable micromirrors are arranged in a lattice pattern on the image generation surface of the DMD 12. Each micromirror can tilt the mirror surface by a predetermined angle around the twist axis, and can have two states of “ON” and “OFF”. When the micromirror is “ON”, the light from the discharge lamp 61 is reflected toward the first optical system 70 (see FIG. 3) as indicated by an arrow L2 in FIG. When “OFF”, the light from the discharge lamp 61 is reflected toward the OFF light plate 27 shown in FIG. 4 (see arrow L1 in FIG. 5). Therefore, by driving each mirror individually, light projection can be controlled for each pixel of the image data, and an image can be generated. The light reflected toward the OFF light plate 27 (not shown) is absorbed as heat and cooled by the flow of outside air.

FIG. 6 is a perspective view showing the illumination unit 20, the first projection optical system 30, and the light modulation unit 10.
The first projection optical system 30 is disposed above the illumination unit 20, and a projection lens unit 31 that holds a first optical system 70 (see FIG. 3) configured by a plurality of lenses, and the projection lens unit 31. And a lens holder 32 for holding the lens. The lens holder 32 is fixed to the upper part of the illumination unit 20 with screws or the like.

  The projection lens unit 31 is provided with a focus gear 36, and the idler gear 35 is engaged with the focus gear 36. A lever gear 34 meshes with the idler gear 35, and a focus lever 33 is fixed to the rotation shaft of the lever gear 34. The tip portion of the focus lever 33 is exposed from the apparatus main body as shown in FIG.

  When the focus lever 33 is moved, the focus gear 36 is rotated via the lever gear 34 and the idler gear 35. When the focus gear 36 rotates, a plurality of lenses constituting the first optical system 70 in the projection lens unit 31 move in predetermined directions, and the focus of the projected image is adjusted.

FIG. 7 is a perspective view showing the second projection optical system 40 together with the first projection optical system 30, the illumination unit 20, and the light modulation unit 10.
The second projection optical system 40 includes a folding mirror 41 and a concave curved mirror 42 constituting the second optical system. The surface of the curved mirror 42 that reflects light can be a spherical surface, a rotationally symmetric aspherical surface, a free curved surface shape, or the like. The second projection optical system 40 also includes a dustproof glass 51 for transmitting the light image reflected from the curved mirror 42 and protecting the optical system components in the apparatus.

  The second projection optical system 40 has a mirror bracket 43 that holds the folding mirror 41 and the dust-proof glass 51. Moreover, it has the free mirror bracket 44 which hold | maintains the curved mirror 42, and the mirror holder 45 to which the mirror bracket 43 and the free mirror bracket 44 are attached.

  The mirror holder 45 has a box shape, and has an upper surface, a lower surface, and a back side in the X direction in the drawing, and has a substantially U-shape when viewed from above. Edge portions extending in the X direction on the near side and the far side in the Z direction of the upper opening of the mirror holder 45 are constituted by an inclined portion and a parallel portion. The inclination part inclines so that it may rise as it goes to the X direction back | inner side from the X direction near side edge part in a figure. The parallel part is parallel to the X direction in the figure. Further, the inclined portion is on the near side in the X direction in the figure from the parallel portion. Further, the edge of the upper opening of the mirror holder 45 extending in the Z direction on the near side in the X direction in the drawing is parallel to the Z direction in the drawing.

  The mirror bracket 43 is attached to the upper part of the mirror holder 45. The mirror bracket 43 has an inclined surface 43a that is inclined so as to rise from the front end portion in the X direction in the drawing in contact with the inclined portion of the upper opening edge of the mirror holder 45 to the far side in the X direction. . Further, the mirror holder 45 has a parallel surface 43b parallel to the X direction that contacts the parallel portion of the upper opening edge. The inclined surface 43a and the parallel surface 43b each have an opening, the folding mirror 41 is held so as to close the opening of the inclined surface 43a, and the dustproof so as to close the opening of the parallel surface 43b. A glass 51 is held.

  The folding mirror 41 is positioned and held on the inclined surface 43 a of the mirror bracket 43 by pressing both ends in the Z direction against the inclined surface 43 a of the mirror bracket 43 by a plate pressing member 46 having a leaf spring shape. The one end of the folding mirror 41 in the Z direction is fixed by two mirror pressing members 46, and the other end is fixed by one mirror pressing member 46.

  The dust-proof glass 51 is positioned and fixed to the mirror bracket 43 by pressing both ends in the Z direction against the parallel surface 43b of the mirror bracket 43 by the plate spring-like glass pressing members 47. The dustproof glass 51 is held by one glass pressing member 47 at each of both ends in the Z direction.

  The free mirror bracket 44 that holds the curved mirror 42 has arm portions 44a that are inclined so as to descend from the back side in the X direction toward the front side in the figure, on the front side and the back side in the Z-axis direction. The free mirror bracket 44 has a connecting portion 44b that connects the two arm portions 44a at the upper portion of the arm portion 44a. The free mirror bracket 44 has an arm portion 44 a attached to the mirror holder 45 so that the curved mirror 42 covers the opening on the back side in the X direction of the mirror holder 45 in the figure.

  The upper end of the curved mirror 42 and the substantially central portion of the end portion on the dust-proof glass 51 side are pressed against the connecting portion 44 b of the free mirror bracket 44 by a plate spring-like free mirror pressing member 49. Further, both ends in the Z-axis direction of the curved mirror on the first optical system side are fixed to the arm portion 44a of the free mirror bracket 44 by screws.

  The second projection optical system 40 is stacked and fixed on the lens holder 32 of the first projection optical system 30. Specifically, a lower surface 451 facing the upper surface of the lens holder 32 is provided below the mirror holder 45. A plurality of cylindrical screwing portions 45 a for screwing to the first projection optical system 30 are formed on the lower surface 451. The second projection optical system 40 is configured to pass screws through unshown screw through holes provided in the lens holder 32 of the first projection optical system 30 and screw the screws into the screw fixing portions 45a. One projection optical system 30 is screwed.

FIG. 8 is a perspective view showing an optical path from the first optical system 70 to the projection surface 2 (screen).
The light beam transmitted through the projection lens unit 31 constituting the first optical system 70 forms an intermediate image conjugate with the image generated by the DMD 12 between the folding mirror 41 and the curved mirror 42. This intermediate image is formed as a curved surface image between the folding mirror 41 and the curved mirror 42. Next, the divergent light beam after forming the intermediate image is incident on the concave curved mirror 42 and becomes a convergent light beam. The curved mirror 42 converts the intermediate image into a “further enlarged image” on the projection surface 2. Projection images are formed.

  As described above, the projection optical system is configured by the first optical system 70 and the second optical system, and an intermediate image is formed between the first optical system 70 and the curved mirror 42 of the second optical system. By enlarging and projecting with the mirror 42, the projection distance can be shortened and it can be used even in a narrow conference room.

FIG. 9 is an external perspective view of the projector 1 with the exterior cover 59 removed.
As shown in FIG. 9, a light source blower 95 is disposed in front of the light source housing 97 in the X direction in the drawing. The light source blower 95 is a double-sided intake sirocco fan, and sucks air in the apparatus from the front side and the back side in the X direction. An air inlet that is one end of the light source duct 96 is connected to an outlet from which the air from the light source blower 95 is discharged. The light source duct 96 passes through an opening (not shown) of the light source housing 97, and an air discharge port which is the other end of the light source duct 96 is on the side of the light source holder 64 of the light source unit 60 accommodated in the light source housing 97. Is opposed to the light source air supply port 64b provided in the projector.

FIG. 10 is a diagram illustrating the installation posture of the projector.
FIG. 10A is a diagram showing an installation posture when the projector is installed on a desk and projected onto the screen S on the wall surface. FIG. 10B is a diagram when the projector is installed on the ceiling and projected onto the screen S on the wall surface. It is a figure which shows an installation attitude | position. FIG. 10C is an installation posture when installing on a wall surface and projecting on a desk, and FIG. 10D is a diagram showing an installation posture when installing on a wall surface and projecting on a ceiling. .
As shown in FIGS. 10A to 10D, the projector is installed in various postures depending on the angle of the projection surface with respect to the ground, the surface on which the projector is installed, and the like.

  FIG. 11 is a cross-sectional view showing a conventional light source cooling device. Conventionally, the air sucked from the light source blower 95 as the air blowing means moves in the light source duct 96 and then sends air from the light source inlet 64b of the light source holder 64 to the arc tube 611 of the discharge lamp 61 to emit light. The tube 611 was cooled. However, depending on the installation posture of the projector, the environment becomes extremely harsh with respect to cooling of the arc tube 611 of the discharge lamp 61, and the temperature of the arc tube 611 of the discharge lamp 61 may deviate from the rating. As a result, there is a possibility that the arc tube 611 is damaged quickly and the life thereof is shortened. This is because the light emitting portion 611a of the arc tube 611 is heated at a higher temperature in the upper part than in the lower part due to heat generation. However, depending on the installation posture of the projector, the light source inlet 64b may be positioned below the arc tube 611. In this case, the air ejected from the light source inlet 64b hits the lower part of the arc tube 611, and the upper part of the light emitting part 611a of the arc tube 611 cannot be cooled well. As a result, the temperature above the light emitting portion 611a of the arc tube 611 is out of the rating.

  As a countermeasure, in this embodiment, the light source cooling device is configured so that air can always be applied to the upper portion of the light emitting portion 611a of the arc tube 611 regardless of the orientation of the projector. This will be specifically described below.

FIG. 12 is a schematic configuration diagram of the light source unit 60 of the present embodiment, and FIG. 13 is an exploded sectional view of the wind direction mechanism 80. Fig.12 (a) is a cross-sectional view, FIG.12 (b) is BB sectional drawing of Fig.12 (a).
As shown in FIG. 12, a wind direction mechanism 80 is provided in the light source holder 64 of the light source unit 60 which is a light source device. As shown in FIG. 13, the wind direction mechanism 80 includes a rotation member 82, a wind direction holder 81 that rotatably holds the rotation member 82, a wind direction sealing member 83, and a spherical weight 84. Yes.

  The wind direction holder 81 has a cylindrical shape, and is provided with a retaining portion 81a that protrudes inwardly at an end edge on the discharge lamp 61 side. In addition, the wind direction holder 81 is provided with an inflow port 81 b that faces the light source air inlet 64 b of the light source holder 64 and into which air sucked from the light source blower 95 flows.

FIG. 14 is a perspective view of the rotating member 82.
The rotating member 82 has a cylindrical part 82b and a disk part 82f formed so as to protrude outward from the discharge lamp side end of the cylindrical part 82b. The disk portion 82f has a first jet port 82a that allows air to flow toward the upper portion of the light emitting portion of the arc tube of the discharge lamp 61, and a second jet port 82d that allows air to flow toward the distal end portion 611b of the arc tube 611. doing. The first jet nozzle 82a is formed by cutting out the disk portion 82f. The second ejection port 82d is provided on the opposite side of the first ejection port 82a across the cylindrical portion 82b, and has a hole shape penetrating the disk portion 82f. A holding chamber 82e that holds the weight 84 is provided outside the second jet nozzle 82d. In the holding chamber 82e, at least the length of the rotating member 82 in the rotating direction is longer than the diameter of the weight 84, and the weight 84 is held in the holding chamber 82e so as to be movable within a predetermined range in the rotating direction of the rotating member 82. Is done.

  Further, the first jet outlet 82a side of the cylindrical portion 82b is thicker than the other portions, and the air that has flowed into the wind direction holder 81 is guided to the first jet outlet 82a on the outer peripheral surface of the cylindrical portion 82b. A wind guide wall 82c is formed.

  The wind direction sealing member 83 has a disk-like configuration in which a light passage hole 83a for allowing the light of the discharge lamp 61 to pass is formed in the center, and a plurality of screw through holes 83b are provided at equal intervals in the circumferential direction. It has been. The diameter of the light passage hole 83 a is substantially the same as the inner diameter of the cylindrical portion 82 b of the rotating member 82. After the rotating member 82 is inserted into the wind direction holder 81, the weight 84 is placed in the holding chamber 82e. Then, the wind direction sealing member 83 is screwed to the wind direction holder 81 so that the rotating member 82 is rotatably held by the wind direction holder 81. The weight 84 is held in a space surrounded by the holding chamber 82e and the wind direction sealing member 83 so as to be movable within a predetermined range in the rotating direction of the rotating member 82.

  As shown in FIG. 12, the air that has flowed into the wind direction holder from the inlet 81 b of the wind direction holder 81 flows into the outer peripheral surface of the cylindrical portion 82 b of the rotating member 82, the disk portion 82 f, and the inner peripheral surface of the wind direction holder 81. And the flow path R1 surrounded by the wind direction sealing member 83. And it ejects to the inside of the reflector 63 from the 1st jet nozzle 82a and the 2nd jet nozzle 82d. The air ejected from the first ejection port 82a flows along the inner peripheral surface of the reflector 63 to the light emitting unit 611a located near the bottom 63a of the mortar-shaped reflector, as indicated by an arrow A1 in FIG. . Thereby, the light emission part 611a can be air-cooled. Further, as indicated by an arrow A2 in FIG. 12A, the air ejected from the second ejection port 82b flows to the tip portion 611b of the arc tube 611, and actively cools the tip portion 611b of the arc tube 611. Can do.

  Further, in the present embodiment, the thickness of the first jet outlet 82a side of the cylindrical portion 82b is made thicker than other portions, and the flow path R1 is narrowed toward the first jet outlet 82a. Thereby, the flow velocity of air can be raised toward the 1st jet nozzle 82a, and air can be ejected from the 1st jet nozzle 82a vigorously. As a result, the air ejected from the first outlet 82a can reach well to the light emitting portion 611a near the bottom 63a of the reflector 63, and the upper portion of the light emitting portion 611a can be air cooled well.

  As shown in FIG. 12, the light emitting portion 611a of the arc tube 611 is near the bottom 63a of the reflector 63, and the air ejected from the first ejection port 82a flows along the reflector 63 as described above. Go. For this reason, in the configuration having only the first ejection port 82a, the distal end portion 611b side of the arc tube 611 is not air-cooled well, and the distal end portion 611b of the arc tube 611 may deviate from the rated temperature. However, the wind direction mechanism 80 of the present embodiment has a second jet outlet 82d that applies air to the tip 611b of the arc tube 611. Therefore, the tip portion 611b of the arc tube 611 can also be air-cooled satisfactorily. Thereby, it can suppress that the front-end | tip part 611b of the arc_tube | tube 611 becomes higher than rated temperature, and can extend the lifetime of the discharge lamp 61. FIG.

  Further, in the present embodiment, the weight 84 is held by the holding chamber 82e of the rotating member 82, and the wind direction holder 81 is arranged so that the holding member 82e is always positioned at the lowermost end by the dead weight of the weight 84. The inside can be rotated.

FIG. 15 is a diagram showing the state of the wind direction mechanism 80 when the projector is installed in the posture of FIG. 10B, and FIG. 16 is the case where the projector is installed in the posture of FIG. 10C. It is a figure which shows the mode of the wind direction mechanism 80 of. FIG. 17 is a diagram showing the state of the wind direction mechanism 80 when the projector is installed in the posture shown in FIG.
As shown in FIGS. 15 to 17, regardless of the installation posture of the projector, the holding chamber 82e holding the weight 84 is always located at the lowermost end, and the first jet outlet 82a provided on the opposite side of the holding chamber 82e is always provided. Located above. In order to install the projector, when the projector is tilted about the rotating direction of the rotating member, the weight 84 moves in the holding chamber 82e due to the weight of the weight 84 and hits the wall of the holding chamber 82e. The impact force when the weight 84 hits the wall of the holding chamber 82e is applied to the rotating member 82. Thereby, the rotation member 82 rotates in the wind direction holder 81. As a result, the first jet outlet 82a can always be positioned above the arc tube 611 regardless of the installation posture of the projector. Therefore, the air ejected from the first ejection port 82a can be applied to the upper part of the light emitting part 611a, and the upper part of the light emitting part 611a, whose temperature rises more easily than the lower part, can be cooled well.

  The rotating member 82 is in contact with the wind direction holder 81 and the wind direction sealing member 83, and a static frictional force is acting between these members. When the attitude of the projector is changed, the rotation member 82 does not rotate unless the rotation activation force that is the force for rotating the rotation member 82 is greater than the static friction force. For example, dust or dirt enters the contact portion between the rotating member 82 and the wind direction holder 81, or dust or dust enters the contact portion between the rotating member 82 and the wind direction sealing member 83, and the static frictional force is generated. May increase. As in the conventional configuration, when the weight 84 is fixed to the rotation member 82 and the rotation activation force is only the dead weight of the weight 84, when the static friction force increases as described above, the static friction force becomes the rotation activation force. May be larger. As a result, even if the installation orientation of the projector is changed, the rotating member 82 does not rotate, the first jet outlet 82a is not positioned above the arc tube 611, and the upper part of the light emitting unit 611a cannot be cooled well. Will occur. The above problem can be solved by increasing the weight 84 and increasing the weight of the weight 84, but this leads to an increase in the weight of the device and an increase in the size of the device.

  On the other hand, in the present embodiment, as described above, when the weight 84 is held in the holding chamber 82e so as to be movable within a predetermined range in the rotating direction of the rotating member 82, and the installation posture of the projector is changed, the weight of the holding chamber 82e is changed. The weight 84 was abutted against the wall. Thereby, the rotation activation force becomes an impact force when the weight 84 hits the wall of the holding chamber 82e. This impact force depends on the mass of the weight 84 and the speed at which the weight 84 hits the wall of the holding chamber 82e. Normally, the projector is tilted at a certain speed in handling the projector during installation. In addition, by instructing the projector to be installed after the projector is tilted vigorously in the instruction manual of the apparatus, it is possible to prompt the user to install the projector after tilting it vigorously. Therefore, when installing, the weight 84 can be abutted against the wall of the holding chamber 82e at a certain speed, and a certain impact force can be generated. Therefore, the rotation activation force can be increased as compared with the case where the rotation activation force is only the weight of the weight 84. Thereby, the rotation member 82 can be rotated without increasing the weight of the weight 84.

  After the turning member 82 is turned, the turning member 82 is turned by the action of the weight of the weight 84. Since the dynamic frictional force between the rotating member 84 and the member in contact with the rotating member 82 is smaller than the static frictional force, the rotating member 842 can be continuously rotated satisfactorily only by the weight of the weight 84. it can. Thereby, when the installation attitude | position of a projector is changed, the rotation member 82 can be rotated favorably and the 1st jet nozzle 82a can be reliably located above the arc tube 611. FIG.

  Moreover, it is preferable to form the wind direction holder 81, the rotation member 82, and the wind direction sealing member 83 with resin. By forming these with resin, it can be manufactured at low cost by injection molding or the like. Thereby, compared with the case where these are formed with a metal etc., an apparatus can be made cheap.

What has been described above is an example, and the present invention has a specific effect for each of the following aspects.
(Aspect 1)
A light source such as a discharge lamp 61, and a cooling device such as a light source cooling device that blows air to the light source from a jet outlet such as the first jet outlet 82a of the rotating member 82 held rotatably. The rotating member 82 has a holding portion such as a holding chamber 82e that holds the weight 84 at a position different from the jet port in the rotating direction of the rotary member 84 so that the jet port is positioned above the light source. In the light source device such as the unit 60, the holding unit holds the weight 84 so as to be movable within a predetermined range in the rotation direction of the rotation member 82.
According to (Aspect 1), since the weight 84 is held so as to be movable within a predetermined range in the rotation direction of the rotation member 82, when the projector is tilted around the optical axis of the light source device, the weight 84 is caused by its own weight. The weight 84 moves in the holding portion. Then, the weight 84 abuts on a restriction portion on the downstream side in the rotation direction of the rotation member 82 among the restriction portions of the holding portion that restricts the movement range of the weight 84 to a predetermined range. At this abutment, an impact force is applied to the rotation member 82, and the impact force becomes a rotation activation force that rotates the rotation member 82. This impact force depends on the mass of the weight 84 and the speed at which the weight 84 hits the holding portion. Normally, the projector is tilted at a certain speed in handling the projector during installation. In addition, by instructing the projector to be installed after the projector is tilted vigorously in the instruction manual of the apparatus, it is possible to prompt the user to install the projector after tilting it vigorously. Therefore, when installing, the weight 84 can be abutted against the holding portion at a certain speed, and a certain impact force can be generated. As a result, the rotational activation force can be made larger than the static frictional force between the rotational member 82 and the member that contacts the rotational member 82. In addition, after the rotation member 82 starts to rotate, the rotation member 82 is rotated by the action of the weight of the weight 84, but the rotation member 82 and the member that contacts the rotation member 82 are rotated. Since the dynamic frictional force is smaller than the static frictional force, the rotational member 82 can be favorably continuously rotated only by the weight effect of the weight 84. Thereby, when the installation posture of the projector is changed, the rotation member 82 can be rotated well, and the jet outlet is surely positioned above the light emitting unit regardless of the posture of the projector. be able to.

(Aspect 2)
In (Aspect 1), in the light source device, when the posture of the light source device is changed around the optical axis, the weight 84 moves in the holding portion due to its own weight, and the weight 84 is a weight of the holding portion such as the holding chamber 82a. The rotation member 82 is abutted against a movement restricting portion (in this embodiment, a wall orthogonal to the rotation direction of the rotation member of the holding chamber 82e) for making the movable range 84 a predetermined range. It was comprised so that the rotation starting force to rotate might generate | occur | produce.
By providing such a configuration, when the attitude of the light source device is changed around the optical axis, the rotating member 82 can be favorably rotated, and the jet nozzle can be surely connected regardless of the attitude of the projector. It can be located above the light emitting part.

(Aspect 3)
In (Aspect 1) or (Aspect 2), the jet outlet such as the first jet outlet 82a is configured such that air is jetted toward the light emitting portion 611a of the light source such as the discharge lamp 61.
According to (Aspect 3), the upper part of the light emitting unit 611a that becomes high temperature due to heat generation can be actively air-cooled, and the lifetime reduction of the discharge lamp 61 and the like can be suppressed.

(Aspect 4)
In (Aspect 3), the rotation member 82 has a second ejection port 82e that ejects air toward the tip of a light source such as the discharge lamp 61.
According to (Aspect 4), as described in the embodiment, the tip of the discharge lamp 61, which is difficult to hit air from a jet outlet such as the first jet outlet 82a and easily rises in temperature, is connected to the second jet outlet 82d. Can be cooled by air. Thereby, the temperature rise of the front-end | tip part of the discharge lamp 61 can be suppressed, and the lifetime reduction of a discharge lamp can be suppressed.

(Aspect 5)
In any one of (Aspect 1) to (Aspect 4), a member that forms a passage for sending air to the turning member 82 and the outlet of the turning member 82 (in this embodiment, the wind direction holder 81 and the wind direction sealing) Member) is made of a resin material.
According to (Aspect 5), as described in the embodiment, the rotation member 82 and the member that forms a passage for sending air to the ejection port of the rotation member 82 can be manufactured at low cost by injection molding. The cost increase of the apparatus can be suppressed.

(Aspect 6)
In an image projection apparatus such as the projector 1 that generates a projection image using light emitted from the light source device and projects the projection image on the projection surface, the light source device of any one of (Aspect 1) to (Aspect 5) is used. Use.
According to (Aspect 6), it is possible to cool the light source of the light source device satisfactorily regardless of the posture of the image projection apparatus such as the projector, and to suppress the lifetime reduction of the light source. .

(Aspect 7)
In (Aspect 6), the light source device is arranged so that the rotation axis direction of the rotation member 82 is parallel to the projection surface and orthogonal to the vertical direction.
With such a configuration, even when the projector is installed in the desktop projection posture shown in FIG. 10C or the ceiling projection posture shown in FIG. Therefore, the jet outlet of the first jet outlet 82a can be positioned above the light source such as the discharge lamp 61.

1: projector 2: projection surface 60: light source 61: discharge lamp 63: reflector 63a: bottom 64b: light source inlet 80: wind direction mechanism 81: wind direction holder 81b: inlet 82: rotating member 82a: first outlet 82b: Cylindrical portion 82d: Second jet outlet 82e: Holding chamber 82f: Disk portion 83: Wind direction sealing member 84: Weight 95: Light source blower 96: Light source duct 611: Light emitting tube 611a: Light emitting portion 611b: Tip portion

JP 2011-164170 A

Claims (7)

A light source;
A cooling device that blows and cools air to the light source from an outlet of a rotating member that is rotatably held;
In the light source device including the holding member that holds the weight at a position different from the ejection port in the rotation direction of the rotation member so that the ejection port is located above the light source.
The light source device, wherein the holding portion holds the weight so as to be movable within a predetermined range in a rotating direction of the rotating member. The light source device according to claim 1,
When the posture of the light source device is changed around the optical axis, the weight moves within the holding part by its own weight, and the weight makes the movable range of the weight of the holding part a predetermined range. A light source device characterized in that a rotation starting force for rotating the rotation member is generated by abutting against a movement restricting portion. The light source device according to claim 1 or 2,
The light source device according to claim 1, wherein the jet port is configured such that air is jetted toward a light emitting portion of the light source. The light source device according to claim 3.
The light source device according to claim 1, wherein the rotating member has a second jet nozzle that jets air toward a tip of the light source. The light source device according to any one of claims 1 to 4,
The light source device, wherein the rotating member and a member that forms a passage for sending air to the outlet of the rotating member are made of a resin material.   An image projection apparatus comprising the light source device according to claim 1, wherein a projection image is generated using light emitted from the light source device, and a projection image is projected onto a projection surface. The image projection apparatus according to claim 6.
An image projection apparatus, wherein the light source device is arranged so that a rotation axis direction of the rotation member is parallel to the projection surface and perpendicular to the vertical direction.

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