JP2008262153A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector that can effectively cool a light source lamp in accordance with various image-light projecting postures. <P>SOLUTION: A projector includes: a light source lamp 1111; and a cooling device that cools the light source lamp 1111 and includes a plurality of cooling fans to deliver air toward the light source lamp 1111. Airflow directions W1, W2 in which the plurality of cooling fans deliver the air are different from each other. The airflow directions W1, W2 are orthogonal to an optical axis A' of a light beam emitted from the light source lamp 1111 and face each other when seen in a direction of the optical axis A'. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projector.

Conventionally, a projector including a light source device, a light modulation device that modulates a light beam emitted from the light source device according to image information to form image light, and a projection optical device that enlarges and projects the image light is known. Yes.
In such a projector, as a light source device, for example, a discharge light emission type including a light source lamp that performs discharge light emission between a pair of electrodes and a reflector that emits a light beam emitted from the light source lamp in a certain direction. A light source device is frequently used. In such a light source device, the temperature in the light source lamp rises due to heat generated by light emission, causing thermal convection, and a temperature difference occurs between the upper side and the lower side of the light source lamp. In this way, when a relatively large bias occurs in the temperature distribution of the light source lamp, blackening or the like is likely to occur on the tube wall of the light source lamp, causing a decrease in the brightness of the light source lamp or a burst of the light source lamp. End up.
Therefore, conventionally, in order to cool the light source lamp efficiently by reducing the temperature difference between the upper side and the lower side of the light source lamp, air is blown in the horizontal direction from the side to the light source lamp by a cooling fan. A technique has been proposed (see, for example, Patent Document 1).

JP 2002-23261 A

The technique described in Patent Document 1 projects image light in a substantially horizontal direction, which is a so-called normal position (a state of being placed on an installation surface such as a desk), and a ceiling position (up and down with respect to the normal position). The projector is designed on the assumption that image light is projected from the projector in a state of being suspended from the ceiling or the like so as to be reversed. That is, even when image light is projected from the projector in both the normal position and the ceiling position, air is blown from the horizontal direction to the light source lamp, and the upper side and the lower side of the light source lamp The temperature difference is alleviated and the light source lamp is efficiently cooled.
However, in the technique described in Patent Document 1, the projector projects an image light in a substantially vertical direction (up and down direction), with an upper projection attitude (an attitude that projects upward) or a lower projection attitude (an attitude that projects downward). When the image light is projected from the cooling fan, the cooling fan is positioned on the upper side or the lower side with respect to the light source lamp, and air is blown in the vertical direction from the cooling fan to the light source lamp. For example, when air is blown from the cooling fan to the light source lamp from the lower side to the upper side, the lower side of the light source lamp is mainly cooled, and there is a large temperature difference between the upper side and the lower side of the light source lamp. As a result, the light source lamp cannot be cooled efficiently.

  The objective of this invention is providing the projector which can cool a light source lamp efficiently corresponding to the case where image light is projected with various attitude | positions.

The projector of the present invention is a projector including a light source lamp and a cooling device that cools the light source lamp, and the cooling device includes a plurality of cooling fans that blow air to the light source lamp, The air blowing directions of the plurality of cooling fans are set in different directions.
Here, as the plurality of cooling fans, air may be directly blown to the light source lamp, or air may be blown to the light source lamp through a duct.

In the present invention, for example, the air blowing direction of one cooling fan among the plurality of cooling fans is set to be horizontal when projecting image light from a projector in a normal position or a ceiling position. deep. With this setting, when projecting image light from a projector in a normal position or a suspended position, air is blown in the horizontal direction with respect to the light source lamp by driving the one cooling fan. The temperature difference between the upper side and the lower side of the light source lamp can be relaxed and the light source lamp can be efficiently cooled.
In addition, since the air blowing directions of the plurality of cooling fans are set to different directions, when projecting image light from the projector in the upper projection posture or the lower projection posture, the one cooling fan is directed to the light source lamp. Even when the air blowing direction is set to the air blowing direction from the lower side to the upper side, the air blown from at least one of the other cooling fans to the light source lamp The air blowing direction can be set to the air blowing direction from the upper side to the lower side or the horizontal air blowing direction. For this reason, when projecting image light from the projector in the upper projection posture or the lower projection posture, at least one of the other cooling fans is driven to drive the light source lamp from the upper side to the lower side. As a result, air is blown in the horizontal direction, and the temperature difference between the upper side and the lower side of the light source lamp can be reduced to efficiently cool the light source lamp.
Therefore, the light source lamp can be efficiently cooled corresponding to the case where the image light is projected from the projector in various postures, and the object of the present invention can be achieved.

In the projector according to the aspect of the invention, the cooling device includes two cooling fans, and the air blowing directions are orthogonal to the optical axis when viewed from the direction along the optical axis of the light beam emitted from the light source lamp. In addition, it is preferable that they are set in directions opposite to each other.
Here, the air blowing directions of the two cooling fans are not limited to the configuration set in the direction orthogonal to the optical axis. Each air blowing direction may be set in a direction that intersects the optical axis at an angle other than 90 ° as long as it is set in a direction perpendicular to the optical axis when viewed from the direction along the optical axis. Good.
For example, as the projector configuration, the projector is set to each of the normal posture, the upper projection posture, the ceiling suspension posture, and the lower projection posture by rotating the projector 90 ° about the optical axis of the light beam emitted from the light source lamp. The configuration is as follows. In such a configuration, according to the present invention, the air blowing directions of the two cooling fans are set as described above. Therefore, in each posture described above, at least one of the two cooling fans is selected. With the cooling fan, the air source can be blown from the upper side to the lower side with respect to the light source lamp or in the horizontal direction. For this reason, when the projector is configured as described above, the light source lamp can be efficiently cooled corresponding to the case where the image light is projected in the various postures described above.
In addition, since the cooling device includes two cooling fans, the light source lamp can be efficiently cooled with a minimum number of cooling fans when image light is projected in various postures, and the projector can be made compact. There is no inhibition.

In the projector according to the aspect of the invention, it is preferable that the air blowing directions are set in the horizontal direction when projecting image light from the projector in a predetermined posture.
In the present invention, each blowing direction is set in the horizontal direction when projecting image light from a projector in a predetermined posture, for example, a normal posture. As a result, when the projector is configured to be set to each of the above postures by rotating by 90 ° about the optical axis as described above, at least one of the two cooling fans is cooled in each of the above postures. The fan can reliably blow air from the upper side to the lower side with respect to the light source lamp or in the horizontal direction.

In the projector according to the aspect of the invention, it is preferable that the air blowing directions are set to be shifted from each other along a direction orthogonal to the air blowing directions.
In the present invention, since the air blowing directions are set as described above, the air from one cooling fan and the air from the other cooling fan do not interfere when the two cooling fans are driven. That is, the air discharged from one cooling fan can be prevented from entering the discharge port of the other cooling fan. For this reason, air can be blown favorably from both cooling fans, and the light source lamp can be cooled more efficiently. Moreover, since it can suppress that the air discharged from one cooling fan, ie, the air heated via the light source lamp, enter into the discharge port of the other cooling fan, thermal deterioration of each cooling fan can be prevented.

In the projector according to the aspect of the invention, the cooling device includes two cooling fans, and the air blowing directions are orthogonal to the optical axis when viewed from the direction along the optical axis of the light beam emitted from the light source lamp. In addition, it is preferable that they are set in directions orthogonal to each other.
Here, the air blowing directions by the plurality of cooling fans are not limited to the configuration set in the direction orthogonal to the optical axis, but are set in directions orthogonal to each other when viewed from the direction along the optical axis. If so, it may be set in a direction intersecting the optical axis at an angle other than 90 °.

According to the present invention, when the projector is configured to be set to the above postures by rotating 90 ° about the optical axis as described above, the air blowing directions of the plurality of cooling fans are as described above. Therefore, in each of the above postures, at least one of the plurality of cooling fans can blow air from the upper side to the lower side with respect to the light source lamp or in the horizontal direction. A possible configuration. For this reason, when the projector is configured as described above, the light source lamp can be efficiently cooled corresponding to the case where the image light is projected in the various postures described above.
In addition, since the cooling device includes two cooling fans, the light source lamp can be efficiently cooled with a minimum number of cooling fans when image light is projected in various postures, and the projector can be made compact. There is no inhibition.

In the projector according to the aspect of the invention, it is preferable that each of the air blowing directions is set in a vertical direction or a horizontal direction when projecting image light from the projector in a predetermined posture.
In the present invention, the air blowing directions of the plurality of cooling fans are perpendicular to each other when viewed from the direction along the optical axis when projecting image light from the projector in a predetermined posture (for example, a normal posture). It is set in each direction or horizontal direction. As a result, when the projector is configured to be set to each of the above postures by rotating 90 ° about the optical axis as described above, at least one of the plurality of cooling fans is cooled in each of the above postures. The fan can reliably blow air from the upper side to the lower side with respect to the light source lamp or in the horizontal direction.

In the projector according to the aspect of the invention, a fan drive control unit that controls operations of the plurality of cooling fans may be provided, and the fan drive control unit may control the operations of the plurality of cooling fans according to the attitude of the projector. preferable.
Here, the fan drive control unit recognizes the attitude of the projector, for example, as shown below.
In other words, the projector is provided with operation means that allows the user to set and input the posture of the projector (for example, a normal placement posture, a ceiling suspension posture, an upper projection posture, a lower projection posture, etc.). The fan drive control unit recognizes the attitude of the projector by inputting an operation signal from the operation means.
Further, the projector is provided with a tilt state detection unit such as a gyro sensor for detecting the attitude of the projector. The fan drive control unit recognizes the attitude of the projector by inputting a signal from the tilt state detection unit.

  In the present invention, the projector includes a fan drive control unit that controls the operations of the plurality of cooling fans according to the attitude of the projector. As a result, the fan drive control unit controls the operation of the plurality of cooling fans in accordance with the attitude of the projector. Therefore, the light source lamp is efficiently cooled in response to the case where the image light is projected in the various attitudes described above. it can.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Configuration of projector]
FIG. 1 is a block diagram illustrating a schematic configuration of the projector 1.
The projector 1 modulates the light beam emitted from the light source according to image information to form a color image (image light), and enlarges and projects this color image on the screen Sc. As shown in FIG. 1, the projector 1 includes an image projection unit 10, an operation unit 20, a first cooling device 30A and a second cooling device 30B, a control device 40, and members 10, 30A, 30B, 40. And an exterior casing 50 (see FIG. 3).

FIG. 2 is a diagram illustrating a schematic configuration of the image projection unit 10. In FIG. 1, only the first light source device 11 </ b> A, the second light source device 11 </ b> B, the liquid crystal panel 151, and the projection lens 16 are illustrated as the configuration of the image projection unit 10 in order to simplify the description. In FIG. 2, in order to simplify the description, the projection direction from the projection lens 16 is defined as a Z axis, and two axes orthogonal to the Z axis are defined as an X axis and a Y axis, respectively. The same applies to the following figures. 2, the Z axis and the X axis are planes formed by the optical axis A of the light beam from the first light source device 11A and the second light source device 11B to the projection lens 16, as shown in FIG. The axes are orthogonal to each other in a plane parallel to the surface. The Y axis is an axis orthogonal to the plane.
Under the control of the control device 40, the image projection unit 10 forms image light and projects it on the screen Sc. As shown in FIG. 2, the image projection unit 10 includes a first light source device 11A and a second light source device 11B, an illumination optical device 12, a color separation optical device 13, a relay optical device 14, and an optical device 15. And a projection lens 16 as a projection optical device.

The first light source device 11 </ b> A and the second light source device 11 </ b> B emit light beams toward the illumination optical device 12. In addition, since each light source device 11A, 11B has the same structure, below, only 1st light source device 11A is demonstrated. And about the 2nd light source device 11B, the same code | symbol is attached | subjected and description is abbreviate | omitted.
11A of 1st light source devices drive the light source lamp 1111 (FIG. 1, FIG. 2) which comprises the light source device main body 111 with a predetermined drive voltage under the control by the light source device main body 111 (FIG. 2) and the control device 40 ( A light source driving unit 112 (FIG. 1) to be lit).
As shown in FIG. 2, the light source device main body 111 includes a light source lamp 1111 that emits light between a pair of electrodes 1111 </ b> A, a main reflecting mirror 1112, a collimating lens 1113, and a lamp housing 1114. The detailed configuration of the lamp housing 1114 will be described at the same time when the cooling devices 30A and 30B are described.
The light beam emitted from the light source lamp 1111 is emitted as a converged light with the emission direction aligned to the front side of the light source device main body 111 by the main reflecting mirror 1112, collimated by the collimating lens 1113, and applied to the illumination optical device 12. It is injected.
Here, as the light source lamp 1111, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is frequently used. Further, the main reflecting mirror 1112 is configured as an elliptical reflector in FIG. 1, but may be configured as a parabolic reflector that reflects the light beam emitted from the light source lamp 1111 in a substantially parallel manner. In this case, the collimating lens 1113 is omitted.
As shown in FIG. 2, the light source device main bodies 111 constituting the light source devices 11A and 11B described above face each other in the X-axis direction in a state where the optical axes A ′ of the emitted light beams are substantially matched. Is arranged.

  As shown in FIG. 2, the illumination optical device 12 includes two first lens arrays 121, a light guide prism 120, a second lens array 122, a polarization conversion element 123, and two light source devices 11A and 11B. A superimposing lens 124 is provided. The light beams emitted from the light source devices 11A and 11B are divided into a plurality of partial light beams by the first lens arrays 121, respectively. The plurality of partial light beams emitted from each first lens array 121 are deflected by approximately 90 ° by the light guide prism 120, travel in the same direction (+ Z axis direction), and form an image near the second lens array 122. Each partial light beam emitted from the second lens array 122 is incident so that its central axis (principal ray) is perpendicular to the incident surface of the polarization conversion element 123, and approximately one type of linearly polarized light is generated by the polarization conversion element 123. Injected as light. A plurality of partial light beams emitted from the polarization conversion element 123 as linearly polarized light and passed through the superimposing lens 124 are superimposed on three liquid crystal panels (to be described later) of the optical device 15.

As shown in FIG. 2, the color separation optical device 13 includes two dichroic mirrors 131 and 132 and a reflection mirror 133, and the dichroic mirrors 131 and 132 and the reflection mirror 133 emit the light from the illumination optical device 12. It has a function of separating a plurality of partial light beams into three color lights of red, green, and blue.
As shown in FIG. 2, the relay optical device 14 includes an incident side lens 141, a relay lens 143, and reflection mirrors 142 and 144, and the color light separated by the color separation optical device 13, for example, red light, is optical device 15. Has a function of leading to a liquid crystal panel on the red light side described later.

  The optical device 15 modulates an incident light beam according to image information to form image light (color image). As shown in FIG. 2, the optical device 15 includes three liquid crystal panels 151 (a liquid crystal panel on the red light side is 151R, a liquid crystal panel on the green light side is 151G, and a liquid crystal panel on the blue light side is 151B), An incident side polarizing plate 152 disposed on the front side of the optical path of each liquid crystal panel 151, an exit side polarizing plate 153 disposed on the rear side of the optical path of each liquid crystal panel 151, and a cross dichroic prism 154 as a color synthesizing optical device. Prepare.

The three incident-side polarizing plates 152 transmit only polarized light having substantially the same polarization direction as that aligned by the polarization conversion element 123 among the light beams separated by the color separation optical device 13 and other light beams. The polarizing film is affixed on the translucent substrate.
The three liquid crystal panels 151 have a configuration in which a liquid crystal as an electro-optical material is hermetically sealed in a pair of transparent glass substrates, and the alignment state of the liquid crystals is controlled according to a drive signal from the control device 40, The polarization direction of the polarized light beam emitted from the incident side polarizing plate 152 is modulated.
The three exit-side polarizing plates 153 have substantially the same function as the incident-side polarizing plate 152 and transmit polarized light in a certain direction among the light beams emitted through the liquid crystal panel 151 and absorb other light beams. To do.

The cross dichroic prism 154 synthesizes each color light modulated for each color light emitted from the emission side polarizing plate 153 to form a color image. The cross dichroic prism 154 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. These dielectric multilayer films transmit color light emitted from the liquid crystal panel 151G and transmitted through the emission side polarizing plate 153, and reflect each color light emitted from the liquid crystal panels 151R and 151B and transmitted through the emission side polarizing plate 153. In this way, the color lights are combined to form a color image.
The projection lens 16 is configured as a combined lens in which a plurality of lenses are combined, and enlarges and projects the color image formed by the cross dichroic prism 154 onto the screen Sc.

FIG. 3 is a diagram schematically showing the attitude of the projector 1.
The operation means 20 includes a remote controller (not shown) and buttons and keys provided in the projector 1. The operation means 20 recognizes an input operation by the user and outputs a predetermined operation signal to the control device 40.
For example, the operation unit 20 recognizes an input operation of “projecting image light from the projector 1 in the normal position” by the user, and outputs an operation signal corresponding to the input operation to the control device 40.
Here, the normal orientation means an orientation in which the projection direction (Z axis) from the projection lens 16 is substantially horizontal, as shown in FIG.
Further, for example, the operation unit 20 recognizes an input operation of “projecting image light from the projector 1 in a suspended position” by the user, and outputs an operation signal corresponding to the input operation to the control device 40.
Here, as shown in FIG. 3 (B), the ceiling suspension posture is rotated from the state of the normal placement posture (FIG. 3 (A)) by 180 ° about the X axis (optical axis A ′) or the Z axis. Means attitude.

Further, for example, the operation unit 20 recognizes an input operation of “projecting image light from the projector 1 in the upward projection posture” by the user, and outputs an operation signal corresponding to the input operation to the control device 40.
Here, as shown in FIG. 3C, the upward projection posture is rotated in the direction of arrow R1 (FIG. 3A) around the X axis from the state of the normal placement posture (FIG. 3A). This means a posture in which the projection direction (Z-axis) from the projection lens 16 is on the upper side.

Further, for example, the operation unit 20 recognizes an input operation of “projecting image light from the projector 1 in the downward projection posture” by the user, and outputs an operation signal corresponding to the input operation to the control device 40.
Here, as shown in FIG. 3D, the downward projection posture is rotated in the direction of the arrow R2 (FIG. 3A) from the state of the normal placement posture (FIG. 3A) around the X axis. This means a posture in which the projection direction (Z-axis) from the projection lens 16 is on the lower side.

4 and 5 are diagrams schematically showing a cooling structure of the light source lamp 1111 by the first cooling device 30A. Specifically, FIG. 4 is a diagram showing a cooling structure when viewed from the light beam exit side. FIG. 5 is a diagram showing a cooling structure when viewed from the + Y-axis direction.
As shown in FIG. 2, the first cooling device 30 </ b> A is provided corresponding to the first light source device 11 </ b> A, and cools the light source lamp 1111 constituting the first light source device 11 </ b> A by blowing air.
As shown in FIG. 2, the second cooling device 30B is provided corresponding to the second light source device 11B, and cools the light source lamp 1111 constituting the first light source device 11B by blowing air.
Since each cooling device 30A, 30B has the same configuration, only the first cooling device 30A will be described below. And about the 2nd cooling device 30B, the same code | symbol is attached | subjected and description is abbreviate | omitted.

Here, before describing the configuration of the first cooling device 30A, the configuration of the lamp housing 1114 will be described. In addition, each lamp housing 1114 which comprises each light source device 11A, 11B has the point by which the formation position of each inlet 1114A, 1114B mentioned later and each baffle plate 1114E, 1114F is set reversely seeing from the light beam emission side. Only different. Only the lamp housing 1114 of the first light source device 11A will be described below.
As shown in FIG. 4 or FIG. 5, the lamp housing 1114 has a substantially rectangular parallelepiped shape in which the light source lamp 1111 and the main reflecting mirror 1112 are housed and arranged.

In the lamp housing 1114, on both end faces intersecting with the Z-axis direction, as shown in FIG. 4 or FIG. 5, an introduction port 1114A for introducing external air into the interior on the front side from which the light beam is emitted. 1114B is formed.
As shown in FIG. 5, the pair of introduction ports 1114 </ b> A and 1114 </ b> B are formed at positions facing each other when viewed from the Y-axis direction.
Further, as shown in FIG. 4, the pair of introduction ports 1114A and 1114B are arranged so that the positions of the opening center positions P1 and P2 in the Y-axis direction are different from each other when viewed from the direction along the optical axis A ′. Is formed.
Further, in the lamp housing 1114, on both end surfaces orthogonal to the pair of introduction ports 1114A and 1114B, as shown in FIG. Discharge ports 1114C and 1114D for discharging are formed.

More specifically, in the present embodiment, the + Z-axis direction side introduction port 1114A has a Y-axis direction length dimension L1 (FIG. 4) set to 15 mm. The introduction port 1114A is formed at a position where the opening center position P1 is deviated from the optical axis A ′ by a separation dimension LO1 (FIG. 4) of 10 mm in the + Y-axis direction.
On the other hand, the length L2 (FIG. 4) in the Y-axis direction of the introduction port 1114B on the −Z-axis direction side is set to 14 mm. The introduction port 1114B is formed at a position where the opening center position P2 is shifted from the optical axis A ′ by a separation dimension LO2 (FIG. 4) of 10 mm in the −Y axis direction.

  Further, in the lamp housing 1114, rectifying plates 1114E and 1114F are formed at the inner peripheral edges of the introduction ports 1114A and 1114B, as shown in FIG. These rectifying plates 1114E and 1114F are arranged in the lamp housing 1114 in an inclined state with respect to each side surface intersecting the Z-axis direction in the lamp housing 1114 from the inner peripheral edge on the front side from which the light flux is emitted from the introduction ports 1114A and 1114B. It is formed so as to protrude toward. The rectifying plate 1114E rectifies the air introduced into the lamp housing 1114 through the inlet 1114A in a direction inclined by a predetermined angle from the −Z axis direction to the −X axis direction. The rectifying plate 1114F rectifies the air introduced into the lamp housing 1114 through the inlet 1114B in a direction inclined by a predetermined angle from the + Z axis direction to the −X axis direction.

As shown in FIG. 1, the first cooling device 30 </ b> A includes a first fan device 31 and a second fan device 32.
As shown in FIG. 1, the first fan device 31 includes a first cooling fan 311 and a first fan driver 312 that drives the first cooling fan 311 with a predetermined drive voltage under the control of the control device 40. .
The first cooling fan 311 is constituted by a centrifugal fan (sirocco fan) that discharges air sucked from the fan rotation axis direction in the rotational tangential direction, and discharges air as shown in FIG. 2, FIG. 4, or FIG. The discharge port 311 </ b> A (FIGS. 2 and 5) is disposed on the + Z-axis direction side of the lamp housing 1114 with the discharge port 311 </ b> A facing the −X-axis direction. The introduction port 1114A and the discharge port 311A of the lamp housing 1114 are connected by a duct 311B.

  That is, the air discharged from the discharge port 311A of the first cooling fan 311 is introduced into the lamp housing 1114 through the duct 311B and the introduction port 1114A. The air introduced into the lamp housing 1114 circulates on the −Z-axis direction side while being rectified by the rectifying plate 1114 </ b> E, and is blown to the + Y-axis direction side of the light source lamp 1111. The air blown to the light source lamp 1111 circulates along the reflection surface of the main reflecting mirror 1112, and is discharged to the outside of the lamp housing 1114 via the discharge ports 1114 </ b> C and 1114 </ b> D of the lamp housing 1114.

As shown in FIG. 1, the second fan device 32 includes a second cooling fan 321 and a second fan driver 322 that drives the second cooling fan 321 with a predetermined driving voltage under the control of the control device 40. .
The second cooling fan 321 is a sirocco fan, and is arranged on the −Z axis direction side of the lamp housing 1114 with the discharge port 321A facing the −X axis direction as shown in FIG. 2, FIG. 4 or FIG. It is installed. The introduction port 1114B of the lamp housing 1114 and the discharge port 321A are connected by a duct 321B.

  That is, the air discharged from the discharge port 321A of the second cooling fan 321 is introduced into the lamp housing 1114 through the duct 321B and the introduction port 1114B. The air introduced into the lamp housing 1114 flows in the + Z-axis direction while being rectified by the rectifying plate 1114 </ b> F, and is blown to the −Y-axis direction of the light source lamp 1111. The air blown to the light source lamp 1111 circulates along the reflection surface of the main reflecting mirror 1112, and is discharged to the outside of the lamp housing 1114 via the discharge ports 1114 </ b> C and 1114 </ b> D of the lamp housing 1114.

  As described above, the blowing direction W1 to the light source lamp 1111 by the first cooling fan 311 and the blowing direction W2 to the light source lamp 1111 by the second cooling fan 321 are along the optical axis A ′ as shown in FIG. When viewed from the direction, they are set in directions orthogonal to the optical axis A ′ and facing each other. Moreover, each ventilation direction W1, W2 is set to the state which mutually shifted | deviated along the Y-axis direction orthogonal to each ventilation direction W1, W2.

FIG. 6 is a diagram schematically showing air blowing directions W1 and W2 to the light source lamp 1111 by the first cooling device 30A when projecting image light from the projector 1 in various postures. Specifically, FIG. 6 shows the air blowing directions W1 and W2 when viewed from the light beam exit side. FIG. 6A is a diagram corresponding to FIG. 3A, and shows the blowing directions W1 and W2 when image light is projected from the projector 1 in the normal orientation. FIGS. 6B to 6D correspond to FIGS. 3B to 3D, respectively.
When projecting image light from the projector 1 in the normal orientation, the air blowing directions W1 and W2 are set in horizontal directions opposite to each other, as shown in FIG.
In addition, when projecting image light from the projector 1 in the ceiling posture, the air blowing directions W1 and W2 are as shown in FIG. 6B with respect to the air blowing directions W1 and W2 in the normal placement posture. It is set in the reverse direction (horizontal direction) rotated by 180 ° around the optical axis A ′ (X axis).

Furthermore, when projecting image light from the projector 1 in the upward projection posture, the air blowing directions W1 and W2 are set as follows.
As shown in FIG. 6C, the air blowing directions W1 and W2 are in the direction of the arrow R1 (FIG. 6A) with the optical axis A 'as the center with respect to the air blowing directions W1 and W2 in the normal orientation. It is set in the direction rotated 90 °.
That is, the blowing direction W1 is set in a direction from the top to the bottom (vertical direction). The blowing direction W2 is set in a direction from the lower side to the upper side (vertical direction).

Moreover, when projecting image light from the projector 1 in the downward projection posture, the air blowing directions W1 and W2 are set as follows.
As shown in FIG. 6 (D), the air blowing directions W1 and W2 are directed in the direction of the arrow R2 (FIG. 6 (A)) with the optical axis A ′ as the center with respect to the air blowing directions W1 and W2 in the normal position. It is set in the direction rotated 90 °.
That is, the air blowing direction W1 is set in a direction from the lower side to the upper side (vertical direction). The blowing direction W2 is set in a direction from the top to the bottom (vertical direction).

The control device 40 includes a CPU (Central Processing Unit) and the like, and controls the entire projector 1 according to a control program stored in a memory (not shown). In addition, as a structure of the control apparatus 40, the function which controls each cooling device 30A, 30B is mainly demonstrated, and description is simplified or abbreviate | omitted about another function. As shown in FIG. 1, the control device 40 includes a liquid crystal panel drive control unit 41, a fan drive control unit 42, and the like.
The liquid crystal panel drive control unit 41 performs various types of image processing on the digital image data obtained by performing signal processing on the image signal (image information), generates a drive signal from the digital image data subjected to image processing, and generates the drive signal. A drive signal is output to the liquid crystal panel 151 to form a predetermined optical image. Examples of the image processing include image size adjustment processing such as enlargement / reduction, trapezoidal distortion correction processing, image quality adjustment processing, and gamma correction processing.

The fan drive control unit 42 receives the operation signal from the operation means 20 to recognize the attitude of the projector 1 and controls the operation of each of the cooling devices 30A and 30B. In addition, since the fan drive control part 42 controls operation | movement of each cooling device 30A, 30B similarly, below, only the structure which controls operation | movement of 1st cooling device 30A is demonstrated. In FIG. 6, for convenience of explanation, arrows W <b> 1 and W <b> 2 indicating the air blowing directions are shown such that the larger air flow rate is larger and the smaller air flow rate is smaller.
The fan drive control unit 42 outputs a predetermined control command to each of the fan drivers 312 and 322 when an operation signal “projecting image light from the projector 1 in the normal position” is input from the operation unit 20. As shown in FIG. 6A, control is performed so that the amount of air blown from the first cooling fan 311 is larger than the amount of air blown from the second cooling fan 321.
Further, when the operation signal indicating that “projecting image light from the projector 1 is projected in the ceiling position” is input from the operation unit 20, the fan drive control unit 42 sends a predetermined control command to each of the fan drivers 312 and 322. As shown in FIG. 6B, the air flow from the second cooling fan 321 is controlled to be larger than the air flow from the first cooling fan 311.

Furthermore, when an operation signal “projecting image light from the projector 1 in the upward projection posture” is input from the operation unit 20, the fan drive control unit 42 sends a predetermined control command to each of the fan drivers 312 and 322. As shown in FIG. 6C, the air flow from the first cooling fan 311 is controlled to be larger than the air flow from the second cooling fan 321.
When the operation signal indicating that “projecting image light from the projector 1 in the downward projection posture” is input from the operation unit 20, the fan drive control unit 42 is supplied to the first fan driver 312 and the second fan driver 322. A predetermined control command is output, and as shown in FIG. 6D, control is performed so that the amount of air blown from the second cooling fan 321 is larger than the amount of air blown from the first cooling fan 311.

As described above, the fan drive control unit 42 determines the amount of air blown from the cooling fan located on the upper side of the two cooling fans 311 and 321 from the cooling fan located on the lower side according to the attitude of the projector 1. The operation of the first cooling device 30A is controlled so as to be larger than the blown amount.
For example, when the amount of air blown from the cooling fan located on the lower side is set to 0, the air blown from the cooling fan located on the upper side and heated through the light source lamp 1111 enters the cooling fan on the lower side, and the cooling fan The fan drive control unit 42 performs control so that the two cooling fans 311 and 321 are always driven.

The first embodiment described above has the following effects.
In the present embodiment, the first cooling device 30A includes the first cooling fan 311 and the second cooling fan 321 in which the air blowing directions W1 and W2 to the light source lamp 1111 are set as described above.
Thus, when image light is projected from the projector 1 in the normal position and the ceiling position, air is blown in the horizontal direction from the first cooling fan 311 and the second cooling fan 321 to the light source lamp 1111. It will be. For this reason, the temperature difference between the upper side and the lower side of the light source lamp 1111 can be relaxed, and the light source lamp 1111 can be efficiently cooled.
Further, when the image light is projected from the projector 1 in the upward projection posture, even if the air blowing direction W2 is set to the air blowing direction from the lower side to the upper side with respect to the light source lamp 1111, the air blowing direction W1 is set to the light source lamp 1111. In contrast, the air blowing direction from the upper side to the lower side can be set. For this reason, even when image light is projected from the projector 1 in the upward projection posture, air is blown from the upper side to the lower side with respect to the light source lamp 1111 from the first cooling fan 311, and the upper side and lower side of the light source lamp 1111. The light source lamp 1111 can be efficiently cooled by relaxing the temperature difference from the side.
Similarly, even when image light is projected from the projector 1 in the downward projection posture, the air blowing direction W2 is set in the direction from the top to the bottom with respect to the light source lamp 1111, so that the light source lamp 1111 can be efficiently cooled. .
Therefore, the light source lamp 1111 can be efficiently cooled corresponding to the case where image light is projected from the projector 1 in various postures.
The second cooling device 30B also includes the first cooling fan 311 and the second cooling fan 321 that are the same as the first cooling device 30A. Therefore, the two light source lamps 1111 are efficiently connected by the cooling devices 30A and 30B. Can be cooled.

  Here, the projector 1 rotates the projector 1 by 90 degrees around the optical axis A ′ (X axis) of the light beam emitted from the light source device main body 111, so that the normal position, the upper projection position, the ceiling position, And the posture of the downward projection posture is set. Further, the air blowing directions W1 and W2 are set in directions facing each other when viewed from the direction along the optical axis A ′. Accordingly, in each of the above postures, at least one of the first cooling fan 311 and the second cooling fan 321 causes air to flow from the upper side to the lower side with respect to the light source lamp 1111 or in the horizontal direction. It becomes the structure which can ventilate. For this reason, the light source lamp 1111 can be efficiently cooled corresponding to the case where the image light is projected in the various postures described above.

  Further, the first cooling fan 311 and the second cooling fan 321 are set in the horizontal direction when projecting image light from the projector 1 in the normal position and the ceiling position. Accordingly, in each of the above postures, at least one of the first cooling fan 311 and the second cooling fan 321 causes air to flow from the upper side to the lower side with respect to the light source lamp 1111 or in the horizontal direction. It can blow reliably.

  Each cooling device 30 </ b> A, 30 </ b> B includes two first cooling fans 311 and second cooling fans 321. As a result, the two light source lamps 1111 can be efficiently cooled with a minimum number of cooling fans corresponding to the case where the image light is projected in each of the above postures, and the size reduction of the projector 1 is not hindered. .

  Further, the air blowing directions W1, W2 are set to be shifted from each other along the Y-axis direction. Thus, when the two cooling fans 311 and 321 are driven, the air from one cooling fan and the air from the other cooling fan do not interfere with each other. That is, the air discharged from one cooling fan can be prevented from entering the discharge port of the other cooling fan. For this reason, air can be blown favorably from both cooling fans 311 and 321, and the light source lamp 1111 can be cooled more efficiently. In addition, since the air discharged from one cooling fan, that is, the air heated through the light source lamp 1111 can be prevented from entering the discharge port of the other cooling fan, thermal deterioration of each cooling fan 311, 321. Can be prevented. Further, by always driving both cooling fans 311 and 321, each cooling fan 311 and 321 always sucks low-temperature air for cooling the light source lamp 1111, and the discharge port of the other cooling fan. In addition, since the air discharged from one cooling fan and heated through the light source lamp 3111 can be prevented from entering, the thermal deterioration of the cooling fans 311 and 321 can be prevented.

The projector 1 includes a fan drive control unit 42 that controls the operations of the first cooling fan 311 and the second cooling fan 321 according to the attitude of the projector 1. As a result, the fan drive control unit 42 controls the operation of each of the fans 311 and 321 according to the attitude of the projector 1, so that the light source lamp 1111 can be set to correspond to the case where the image light is projected in the various attitudes described above. It can be cooled efficiently.
Also, the fan drive control unit 42 determines the amount of air blown from the cooling fan located on the upper side of the two cooling fans 311 and 321 from the amount of air blown from the cooling fan located on the lower side, depending on the attitude of the projector 1. The cooling device 30 is controlled so as to increase the amount. Accordingly, the upper side of the light source lamp 1111 can be effectively cooled in response to the case where the image light is projected in the various postures described above.
In the above embodiment, in order to simplify the description, the posture of the projector 1 has been described as an example of four postures of a normal placement posture, a ceiling suspension posture, an upper projection posture, and a lower projection posture. The projector 1 can be set to various postures capable of projecting in all directions of 360 ° with the optical axis A ′ as the center, and the above-described effects can be obtained even in such various postures. .

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
FIG. 7 is a block diagram showing a schematic configuration of the projector 1 in the second embodiment.
FIG. 8 is a diagram illustrating a schematic configuration of the image projection unit 10 according to the second embodiment.
In the first embodiment, the projector 1 is configured as a two-lamp type including two light source devices 11A and 11B. Further, the projector 1 includes two cooling devices 30A and 30B corresponding to the two-lamp type. And each ventilation direction W1, W2 is set to the direction orthogonal to optical axis A 'and mutually opposing, when it sees from the direction in alignment with optical axis A'.
On the other hand, in the present embodiment, the projector 1 is configured as a one-lamp type having only one light source device 11 as shown in FIG. 7 or FIG. Further, as shown in FIG. 7, the projector 1 includes only one cooling device 30 corresponding to the one-lamp type. And each ventilation direction W1, W2 is set to the direction orthogonal to optical axis A 'and mutually orthogonal when it sees from the direction in alignment with optical axis A'.
Other configurations are the same as those in the first embodiment.

  In the present embodiment, as shown in FIG. 8, the image projection unit 10 corresponds to a one-lamp type, and the first lens array 121 is one of the two first lens arrays 121 described in the first embodiment. The light guide prism 120 is omitted, and the light guide prism 120 has a substantially L shape in plan view.

FIG. 9 is a diagram schematically showing air blowing directions W1 and W2 to the light source lamp 1111 by the cooling device 30 when projecting image light from the projector 1 in various postures in the second embodiment. Specifically, FIGS. 9A to 9D are diagrams corresponding to FIGS. 3A to 3D, respectively, similarly to FIGS. 6A to 6D. .
Of the two cooling fans 311, 321, the first cooling fan 311 is air from the −Z axis direction side to the + Z axis direction side (arrow W1 direction) with respect to the light source lamp 1111 as shown in FIG. Is set to blow.
Further, as shown in FIG. 9, the second cooling fan 321 is set to blow air toward the light source lamp 1111 from the −Y axis direction side to the + Y axis direction side (arrow W2 direction). Yes.

When projecting image light from the projector 1 in the normal orientation, the air blowing directions W1 and W2 are set as shown below.
That is, the blowing direction W1 is set in the horizontal direction as shown in FIG. Further, as shown in FIG. 9A, the air blowing direction W2 is set in a direction from the bottom to the top (vertical direction).
In addition, when projecting image light from the projector 1 in the ceiling position, the air blowing direction W1 is rotated by 180 ° about the optical axis A ′ with respect to the normal position as in the first embodiment. As shown in FIG. 9 (B), it is set in the reverse direction (horizontal direction) with respect to the blowing direction W1 in the normal posture. Further, the blowing direction W2 is set in a direction from the top to the bottom (vertical direction) as shown in FIG. 9B.

Furthermore, when projecting image light from the projector 1 in the upward projection posture, the air blowing direction W1 is in the direction of the arrow R1 centering on the optical axis A ′ with respect to the normal placement posture as in the first embodiment (FIG. 9). Since (A)) is rotated by 90 °, as shown in FIG. 9C, the direction is set from the lower side to the upper side (vertical direction). Moreover, the ventilation direction W2 is set to a horizontal direction, as shown in FIG.9 (C).
When projecting image light from the projector 1 in the downward projection posture, the air blowing direction W1 is the direction of the arrow R2 centering on the optical axis A ′ with respect to the normal placement posture as in the first embodiment (FIG. 9). Since (A)) is rotated by 90 °, it is set in the direction from the top to the bottom (vertical direction) as shown in FIG. Moreover, the ventilation direction W2 is set to a horizontal direction as shown in FIG.9 (D).

  Although not shown in the drawings, in this embodiment as well as the first embodiment, the first cooling fan 311 and the second cooling fan 321 and the light source lamp 1111 (light source device main body 111) are not connected. A duct and a lamp housing are respectively disposed.

  In the present embodiment, the fan drive control unit 42 is arranged on the upper side of the two cooling fans 311 and 321 according to the attitude of the projector 1 as shown in FIG. The cooling device 30 is controlled so that the two cooling fans 311 and 321 are always driven because the amount of air blown from the cooling fan located is larger than the amount of air blown from the cooling fan located below.

  In the second embodiment described above, even when the air blowing directions W1 and W2 are set in directions orthogonal to each other as described above, the same effects as those of the first embodiment can be obtained.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In each said embodiment, the structure of cooling device 30,30A, 30B is not restricted to the structure demonstrated in the said embodiment.
That is, the cooling devices 30, 30 </ b> A, and 30 </ b> B are provided with the two cooling fans 311 and 321, but the configuration is not limited thereto, and may be configured with three or more cooling fans.
In addition, the air blowing directions W1 and W2 of the two cooling fans 311 and 321 are set in the direction intersecting the optical axis A ′ at an angle other than 90 ° by the rectifying plates 1114E and 1114F. The direction may be orthogonal to the optical axis A ′.
Further, the blowing directions W1 and W2 of the two cooling fans 311 and 321 are set in a direction orthogonal to the optical axis A ′ and facing each other or in a direction orthogonal to each other when viewed from the direction along the optical axis A ′. However, the present invention is not limited to this, and other directions may be used as long as they are different from each other.
Further, the two cooling fans 311 and 321 are not limited to sirocco fans, and may be constituted by axial fans whose air suction direction and discharge direction are the same.

In each of the embodiments described above, the fan drive control unit 42 recognizes the attitude of the projector 1 by inputting an operation signal from the operation unit 20, and operates the cooling devices 30, 30 </ b> A, 30 </ b> B based on the recognized result. However, the present invention is not limited to this.
For example, the projector 1 is provided with a tilt state detection unit such as a gyro sensor that detects the attitude of the projector 1. And the fan drive control part 42 recognizes the attitude | position of the projector 1 by inputting the signal from an inclination state detection part, and controls the operation | movement of cooling device 30,30A, 30B based on the recognized result. It does not matter.

In each of the embodiments, the fan drive control unit 42 may control the operation of the cooling devices 30, 30 </ b> A, and 30 </ b> B in a manner different from that of each of the embodiments.
For example, the fan drive control unit 42 drives both the first cooling fan 311 and the second cooling fan 321, but not limited to this, only one of the first cooling fan 311 and the second cooling fan 321. It may be configured to drive.

In each of the embodiments, the image projection unit 10 is configured such that the optical axis A ′ (X axis) emitted from the light source devices 11, 11 </ b> A, and 11 </ b> B is orthogonal to the projection direction (Z axis) from the projection lens 16. However, the present invention is not limited to this. For example, the optical axis A ′ and the projection direction may be parallel to each other.
In the first embodiment, the air blowing directions W1, W2 may be set to the directions described in the second embodiment. Conversely, in the second embodiment, the air blowing directions W1 and W2 may be set to the directions described in the first embodiment.

In each of the above embodiments, the projector 1 is configured as a three-plate projector including three liquid crystal panels 151. However, the projector 1 is not limited to this, and may be configured as a single-plate projector including one liquid crystal panel. . Moreover, you may comprise as a projector provided with two liquid crystal panels, or a projector provided with four or more liquid crystal panels.
In each of the above embodiments, a transmissive liquid crystal panel having a different light incident surface and light emitting surface is used. However, a reflective liquid crystal panel having the same light incident surface and light emitting surface may be used.
In each of the above embodiments, a liquid crystal panel is used as the light modulation device, but a light modulation device other than liquid crystal, such as a device using a micromirror, may be used. In this case, the polarizing plates 152 and 153 on the light incident side and the light emitting side can be omitted.

  INDUSTRIAL APPLICABILITY Since the light source lamp can be efficiently cooled corresponding to the case where image light is projected in various postures, the present invention can be used for projectors used in presentations and home theaters.

1 is a block diagram showing a schematic configuration of a projector according to a first embodiment. The figure which shows schematic structure of the image projection part in the said embodiment. The figure which shows typically the attitude | position of the projector in the said embodiment. The figure which shows typically the cooling structure of the light source lamp by the 1st cooling device in the said embodiment. The figure which shows typically the cooling structure of the light source lamp by the 1st cooling device in the said embodiment. The figure which shows typically each blowing direction of the air to the light source lamp by the 1st cooling device in the case of projecting image light from a projector with the various attitude | positions in the said embodiment. The block diagram which shows schematic structure of the projector in 2nd Embodiment. The figure which shows schematic structure of the image projection part in the said embodiment. The figure which shows typically each ventilation direction of the air to the light source lamp by the cooling device in the case of projecting image light from the projector with various attitude | positions in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 30, 30A, 30B ... Cooling device, 42 ... Fan drive control part, 311, 321 ... Cooling fan, 1111 ... Light source lamp, A '... Optical axis, W1, W2 ... Air blowing direction.

Claims (7)

A projector comprising a light source lamp and a cooling device for cooling the light source lamp,
The cooling device includes a plurality of cooling fans that blow air to the light source lamp,
Each of the air blowing directions of the plurality of cooling fans is set to be different from each other. The projector according to claim 1, wherein
The cooling device includes two cooling fans,
Each of the air blowing directions is set in a direction orthogonal to the optical axis and facing each other when viewed from a direction along the optical axis of a light beam emitted from the light source lamp. projector. The projector according to claim 2,
Each of the air blowing directions is set in a horizontal direction when projecting image light from the projector in a predetermined posture. In the projector according to claim 2 or 3,
Each of the air blowing directions is set to be shifted from each other along a direction orthogonal to the air blowing directions. The projector according to claim 1, wherein
The cooling device includes two cooling fans,
Each of the blowing directions is set in a direction perpendicular to the optical axis and perpendicular to each other when viewed from a direction along the optical axis of the light beam emitted from the light source lamp. projector. The projector according to claim 5, wherein
Each of the blowing directions is set in a vertical direction or a horizontal direction when projecting image light from the projector in a predetermined posture. The projector according to any one of claims 1 to 6,
A fan drive control unit for controlling operations of the plurality of cooling fans;
The fan drive control unit controls operations of the plurality of cooling fans according to an attitude of the projector.

Images