LIGHT SOURCE DEVICE, ILLUMINATION DEVICE, AND PROJECTOR

An illumination device includes a light source device, an attachment member to which the light source device is attached, and a first fixture inserted into the light source device to fix the light source device to the attachment member. The light source device includes a light source and a housing configured to house the light source on the inside. The housing includes a first housing and a second housing combined with each other to house the light source on the inside, and a second fixture inserted into the first housing and the second housing to fix the first housing and the second housing in a combined state. A removing direction of the first fixture and a removing direction of the second fixture with respect to the light source device are different.

CROSS REFERENCE TO RELATED APPLICATION

The entire disclosures of Japanese Patent Application No. 2015-162514 filed Aug. 20, 2015, and Japanese Patent Application No. 2015-162515 filed Aug. 20, 2015, are expressly incorporated by reference herein.

BACKGROUND

1. Technical Field

The present invention relates to a light source device, an illumination device, and a projector.

2. Related Art

There has been known a projector including a light source device, a light modulating device that modulates light emitted from the light source device and forms an image corresponding to image information, and a projecting optical device that enlarges and projects the formed image on a projection surface such as a screen (see, for example, JP-A-2011-181431 (Patent Literature 1) and JP-A-2009-211975 (Patent Literature 2)).

In the projector described in Patent Literature 1, the light source device includes a light-source-device main body including a luminous tube and a reflecting mirror, a collimating lens, a housing that houses the light-source-device main body and the collimating lens on the inside, and a channel switching mechanism. Among these components, the housing is configured by combining a cylindrical member that covers the front side of the reflecting mirror and a blocking member that covers the rear side of the reflecting mirror.

On the other hand, in the projector described in Patent Literature 2, the light source device includes a light-source-device main body including a light source lamp and a reflector that aligns lights emitted from the light source lamp in a fixed emitting direction, a collimating lens that collimates the lights aligned in the emitting direction by the reflector, and a housing that houses the light-source-device main body and the collimating lens on the inside. Among these components, an opening end edge of the reflector is formed in a substantially rectangular shape when viewed from the emitting direction side of the lights.

The housing includes a first housing disposed on the emitting direction side of the lights emitted by the light-source-device main body, a second housing disposed on the opposite side of the emitting direction, and an urging member disposed to be interposed between the first housing and the second housing to urge the light-source-device main body to the first housing side. The first housing, the second housing, and the urging member are integrated by screws.

Incidentally, the light source device needs to be replaced because of the rupture, the life, or the like of the luminous tube. In such a case, when the light source device is directly attached to a light-source housing member in the projector, the light source device is detached from the light-source housing section and replaced. When a light-source attaching member attached with the light source device is detachably provided in the projector, after the light-source attaching member is detached from the projector, the light source device is detached from the light-source attaching member and replaced. In these configurations, when a light-source-device fixture for fixing the light source device to an attachment member (e.g., the light-source housing member or the light-source attaching member) and a housing fixture for fixing a plurality of members (e.g., the cylindrical member and the blocking member) configuring the housing of the light source device are visually recognized, an operator, who replaces the light source device, is likely to detach the housing fixture by mistake.

For easiness of attachment to the housing and a reduction in the size of a product, a square reflector having corners such as the reflector described in Patent Literature 2 is often adopted.

In order to improve light use efficiency of the light source lamp, a reflecting surface shape of the reflector needs to be optimized. However, in the case of the square reflector, since a part of a reflecting surface is formed in a plane shape, it is difficult to condense lights reflected in the part and align the lights in one direction. As a result, the light use efficiency is deteriorated. Since the thickness of the reflector is unequal, it is likely that the reflecting surface warps. Therefore, difficulty in machining and assembly of components increases.

On the other hand, it is conceivable to make it easy to condense the reflected lights and align the reflected lights in one direction, equalize the thickness of the reflector, and improve the light use efficiency and easiness of manufacturing by adopting a round reflector, a plane shape portion of which is smaller than the plane shape portion of the square reflector.

However, in the round reflector, because of a curved surface shape thereof, it is difficult to position and fix the round reflector with respect to the housing.

SUMMARY

An advantage of some aspects of the invention is to provide an illumination device and a projector from which a light source device can be appropriately detached and a light source device and a projector that can improve light use efficiency.

An illumination device according to a first aspect of the invention includes: alight source device; an attachment member to which the light source device is attached; and a first fixture inserted into the light source device and the attachment member to fix the light source device and the attachment member. The light source device includes: a light source; and a housing configured to house the light source on the inside. The housing includes: a first housing and a second housing combined with each other to house the light source on the inside; and a second fixture inserted into the first housing and the second housing to fix the first housing and the second housing. A removing direction of the first fixture and a removing direction of the second fixture with respect to the light source device are different.

Note that, as the first fixture and the second fixture, fastening members such as screws can be illustrated.

According to the first aspect, the removing direction of the first fixture for fixing the light source device to the attachment member and the removing direction of the second fixture for fixing the first housing and the second housing of the housing are different. Therefore, when the light source device is viewed from the removing direction side of the first fixture, it is possible to make it difficult to visually recognize the second fixture. Therefore, when the first fixture is removed and the light source device is detached from the attachment member, it is possible to suppress the second fixture from being removed. It is possible to appropriately detach the light source device.

In the first aspect, it is preferable that the first fixture is inserted into the light source device and the attachment member along a direction in which the attachment member is located with respect to the light source device, and the second fixture is inserted into the first housing and the second housing along the opposite direction of the inserting direction of the first fixture.

With such a configuration, the respective inserting directions of the first fixture and the second fixture are directions opposite to each other. Therefore, as explained above, when the light source device is viewed from the removing direction side of the first fixture, it is possible to make it more difficult to visually recognize the second fixture. Consequently, when the first fixture is removed and the light source device is detached from the attachment member, it is possible to surely suppress the second fixture from being removed. Therefore, it is possible to appropriately detach the light source device from the attachment member.

In the first aspect, it is preferable that the first housing is located on the attachment member side in the housing, the second housing is located on the opposite side of the attachment member in the housing, the first fixture is inserted into the attachment member from the second housing side, and the second fixture is inserted into the second housing from the first housing side.

With such a configuration, it is possible to surely set the respective inserting directions of the first fixture and the second fixture in opposite directions each other. In other words, it is possible to surely set the respective removing directions of the first fixture and the second fixture in opposite directions each other. Therefore, it is possible to more surely make it difficult to visually recognize the second fixture when the first fixture is removed. It is possible to surely suppress the second fixture from being removed.

In the first aspect, it is preferable that the first housing includes, on a surface opposed to the attachment member, an insertion hole into which the second fixture is inserted, and the second fixture inserted into the insertion hole is covered by the attachment member.

With such a configuration, in a state in which the light source device is attached to the attachment member, it is difficult to visually recognize the second fixture. Therefore, when the light source device is detached from the attachment member, it is possible to more surely suppress the second fixture from being removed. Therefore, it is possible to appropriately remove the light source device from the attachment member.

In the first aspect, it is preferable that the first housing includes a hole section through which the first fixture, which is inserted from the second housing side and fixed to the attachment member, is inserted.

If the hole section is located in the second housing apart from the attachment member, a dimension between the hole section and the attachment member is long. In this case, it is necessary to adopt a relatively long first fixture. Moreover, it is difficult to stably fix the light source device to the attachment member.

On the other hand, since the hole section is located in the first housing close to the attachment member compared with the second housing, it is possible to reduce the dimension between the hole section and the attachment member. Therefore, it is possible to adopt a relatively short first fixture. It is possible to stably fix the light source device to the attachment member.

In the first aspect, it is preferable that the first housing includes a projecting section projecting further to the outer side than the second housing when viewed from an attachment side of the light source device to the attachment member, and the hole section is located in the projecting section.

With such a configuration, since the hole section, through which the first fixture is inserted, is located in the projecting section projecting further to the outer side than the second housing, it is possible to easily insert and remove the first fixture on the attachment side of the light source device to the attachment member and it is possible to easily insert and remove the first fixture into and from the attachment member. Therefore, it is possible to easily attach and detach the light source device to and from the attachment member.

In the first aspect, it is preferable that the first housing is located on an emission side of light emitted by the light source device with respect to the second housing.

With such a configuration, the light source device is disposed such that the first housing located on the emission side of the light with respect to the second housing is close to the attachment member. Consequently, it is possible to easily carry out adjustment of an emitting position of the light with respect to the attachment member. Therefore, it is possible to easily and appropriately adjust a traveling direction of light emitted from an illumination device.

A projector according to a second aspect of the invention includes the illumination device.

With the second aspect, it is possible to achieve effects same as the effects of the illumination device according to the first aspect.

In the second aspect, it is preferable that the illumination device includes a plurality of the light source devices, and the projector includes an optical-path changing device configured to change optical paths of lights emitted from the plurality of light source devices and emit the lights.

With such a configuration, when the plurality of light source devices are attached to the attachment member and when a plurality of the attachment members attached with light source devices are provided, it is possible to align, with the optical-path changing device, the lights emitted from the light source devices in one direction and emit the lights. Therefore, it is possible to form an image effectively using the lights emitted from the light source devices and increase the luminance of the image to be projected.

A light source device according to a third aspect of the invention includes: a light emitting section; a reflector configured to reflect light made incident from the light emitting section; a housing configured to house the light emitting section and the reflector on the inside; and a fixing member configured to fix the reflector. The reflector is formed in a circular shape at an end edge when viewed from an emitting direction side of the light reflected and emitted by the reflector. The housing includes: an emission side housing located, with respect to the reflector, on an emitting direction side of the light reflected by the reflector; and a proximal-end side housing located on the opposite side of the emitting direction of the light and combined with the emission side housing. The fixing member is attached to the emission side housing in a state in which the reflector is fixed.

According to the third aspect, since the fixing member is attached to the emission side housing in the state in which the reflector formed in the circular shape at the end edge is fixed, it is possible to easily attach the reflector to the emission side housing. Therefore, it is easy to condense the reflected lights and align the reflected lights in one direction with the reflector and equalize the thickness of the reflector. Therefore, it is possible to improve use efficiency of the light emitted from the light emitting section. Besides, it is possible to improve easiness of manufacturing of the light source device.

In the third aspect, it is preferable that the reflector includes a convex section projecting toward the outer side, and the fixing member includes: an opening section into which the reflector is inserted; and a concave section located at the end edge of the opening section, the convex section fitting in the concave section.

With such a configuration, when the reflector is inserted into the opening section of the fixing member, the convex section of the reflector fits in the concave section of the fixing member. Consequently, it is possible to suppress the rotation of the reflector about an axis extending along the emitting direction of the light emitted by the reflector. Therefore, it is possible to stably attach the reflector to the emission side housing.

In the third aspect, it is preferable that the fixing member includes a pressing section configured to press the reflector inserted into the opening section to the concave section side.

With such a configuration, the pressing section of the fixing member presses the reflector to the concave section side in which the convex section fits. Therefore, it is possible to surely suppress the swing and the rotation of the reflector. Therefore, it is possible to more stably fix the reflector.

In the third aspect, it is preferable that the emission side housing includes a projecting section projecting to the fixing member side, and the fixing member includes an insertion section into which the projecting section is inserted.

With such a configuration, since the projecting section of the emission side housing is inserted into the insertion section of the fixing member, it is possible to accurately position the fixing member with respect to the emission side housing. Therefore, it is possible to attach the fixing member and the reflector to appropriate positions of the emission side housing.

In the third aspect, it is preferable that the fixing member includes an expanding/reducing section configured to expand and reduce the insertion section and cause the end edge of the insertion section to hold the projecting section.

With such a configuration, since the projecting section is held by the end edge of the insertion section expanded and reduced by the expanding/reducing section, it is possible to provisionally fix the fixing member to the emission side housing. Therefore, it is possible to more surely attach the fixing member and the reflector to appropriate positions of the emission side housing. Besides, it is possible to easily perform an attachment process for attaching the reflector and the fixing member to the emission side housing.

In the third aspect, it is preferable that the expanding/reducing section extends to the opposite side of the emission side housing in the fixing member, and the insertion section is expanded in diameter when the expanding/reducing section is displaced to the center side of the fixing member.

With such a configuration, when the expanding/reducing section is displaced to the center side of the fixing member, the insertion section is expanded in diameter and, when the expanding/reducing section is displaced to the opposite side of the center of the fixing member, the insertion section is reduced in diameter. Consequently, it is possible to easily expand and reduce the insertion section. It is possible to easily carry out operation for inserting the projecting section into the insertion section and operation for holding the projecting section inserted into the insertion section. Therefore, it is possible to easily provisionally fix the fixing member to the emission side housing.

In the third aspect, it is preferable that the fixing member includes: an insert-through hole through which a fixture for fixing the fixing member to the emission side housing is inserted; and a flexible section cut out and formed continuously to the insertion hole, the flexible section forming the end edge of the insert-through hole.

With such a configuration, even when tolerance occurs in a component dimension of at least one of the fixing member and the emission side housing, since the flexible section warps, it is possible to shift the position of the insert-through hole and absorb the tolerance. Therefore, it is possible to surely attach the fixing member to the emission side housing.

In the third aspect, it is preferable that the emission side housing includes: a main body section combined with the proximal-end side housing; and an air guide section disposed on the inner side of the main body section and configured to guide a cooling gas to the light emitting section, and the air guide section includes a step section in which an opening end edge of the reflector is fit.

With such a configuration, since the opening end edge of the reflector is fit in the step section of the air guide section, it is possible to suppress a leak of a cooling gas guided by the air guide section and efficiently guide the cooling gas to the light emitting section. Therefore, it is possible to improve cooling efficiency of the light emitting section.

A projector according to a fourth aspect of the invention includes the light source device.

According to the fourth aspect, it is possible to achieve effects same as the effects of the light source device according to the third aspect.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

An embodiment of the invention is explained below with reference to the diagrams.

Exterior Configuration of a Projector

FIG. 1is a schematic perspective view showing a projector1according to this embodiment.

The projector1according to this embodiment is a projection-type display apparatus that modulates light emitted from an illumination device31explained below, forms an image corresponding to image information, and enlarges and projects the image on a projection surface such as a screen. As shown inFIG. 1, the projector1includes an exterior housing2that configures an exterior.

As explained in detail below, such a projector1includes, in the exterior housing2, the illumination device31(seeFIG. 2) including a plurality of lamp units4to which a plurality of light source devices5are detachably attached and an optical-path changing device7that aligns lights emitted from the lamp units in one direction and emits the lights. As one characteristic of the projector1, the projector1is configured such that a removing direction of fixtures for fixing the light source devices5to attaching sections of light-source attaching members6configuring the lamp units4and a removing direction of fixtures for fixing a first housing511and a second housing512(seeFIGS. 11 and 12) configuring the light source device5are opposite. As another characteristic of the projector1, a reflector562(seeFIGS. 11 and 12), which is a round reflector, is adopted as the light source device5and the reflector562is fixed to an emission side housing51A located on a light emission side.

The configuration of the projector1is explained below.

Configuration of the Exterior Housing

The exterior housing2is formed in a substantially rectangular parallelepiped shape. The exterior housing2includes a top surface section21, a bottom surface section22, a front surface section23, a rear surface section24, a left side surface section25, and a right side surface section26.

In the top surface section21, a pair of handle sections211used for, for example, gripping of the projector1by a user and fixing of the projector1to an instrument set on a ceiling or the like is provided.

In the bottom surface section22, although not shown in the figure, a leg section, which comes into contact with a placing surface when the projector1is placed on the placing surface, is provided.

In the front surface section23, an opening section231for exposing a part of a projection optical device35explained below is formed.

In the rear surface section24, although not shown in the figure, an opening section for inserting and removing the lamp units4(4A and4B) and the optical-path changing device7of the illumination device31explained below (seeFIG. 2) into and from the exterior housing2is formed. The opening section is covered by a cover member.

Internal Configuration of the Projector

FIG. 2is a schematic diagram showing the internal configuration of the projector1.

The projector1includes, besides the exterior housing2, as shown inFIG. 2, an image forming device3disposed in the exterior housing2. Besides, the projector1includes a control device that controls the projector1and a power supply device that supplies electric power to electronic components configuring the projector1.

Configuration of an Image Forming Device

The image forming device3forms and projects an image corresponding to image information input from the control device. The image forming device3includes the illumination device31, an equalizing device32, a color separating device33, an electro-optical device34, a projection optical device35, a housing for optical components36, and a base member37.

Among these components, the base member37is a member that is connected to the housing for optical components36and to which the lamp units4(4A and4B) and the optical-path changing device7configuring the illumination device31are fixed.

The illumination device31emits light to the equalizing device32. The configuration of the illumination device31is explained below in detail.

The equalizing device32equalizes the illuminance in a surface orthogonal to the center axis of the light emitted from the illumination device31. The equalizing device32includes a cinema filter321, a first lens array322, a UV filter323, a second lens array324, a polarization converting element325, and an superimposing lens326.

The color separating device33separates the light made incident from the equalizing device32into three color lights of red (R), green (G), and blue (B). The color separating device33includes dichroic mirrors331and332, reflecting mirrors333to336, and relay lenses337and338.

The electro-optical device34modulates the separated color lights according to the image information and thereafter combines the modulated color lights. The electro-optical device34includes liquid crystal panels341(liquid crystal panels for red, green, and blue are respectively represented as341R,341G, and341B) functioning as light modulating devices provided for the respective separated color lights, an incidence-side sheet polarizer342and an emission-side sheet polarizer343, and one color combining device344. Among these components, as the color combining device344, a cross dichroic prism can be adopted.

The projection optical device35is a projection lens that enlarges and projects, on the projection surface, light (light for forming an image) combined by the color combining device344. As such a projection optical device35, an assembled lens in which a plurality of lenses are disposed in a lens barrel can be adopted.

The housing for optical components36is a box-like housing in which an illumination optical axis Ax is set on the inside. The equalizing device32and the color separating device33are disposed in positions on the illumination optical axis Ax in the housing for optical components36. The illumination device31, the electro-optical device34, and the projection optical device35are located outside the housing for optical components36but are disposed according to the illumination optical axis Ax.

Configuration of the Illumination Device

FIG. 3is a perspective view showing the illumination device31.FIG. 4is a plan view showing the illumination device31.

The illumination device31emits light to the equalizing device32as explained above. The illumination device31includes, as shown inFIGS. 2 to 4, the plurality of lamp units4(4A and4B), each including a plurality of light source devices5, the optical-path changing device7, and a cooling device8. Specifically, the illumination device31includes two lamp units4A and4B, each including two light source devices5, the optical-path changing device7, and the cooling device8.

Note that, in the following explanation, a traveling direction of light emitted from the illumination device31is referred to as +Z direction and directions respectively orthogonal to the +Z direction and orthogonal to each other are referred to as +X direction and +Y direction. In this embodiment, a direction from the left side surface section25toward the right side surface section26is set as the +X direction. A direction from the bottom surface section22toward the top surface section21is set as the +Y direction. Although not shown in the figure, for convenience of explanation, the opposite direction of the +Z direction is set as a −Z direction in the following explanation. The same applies to a −X direction and a −Y direction.

Configuration of the Cooling Device

Under the control by the control device, the cooling device8feeds a cooling gas supplied to the light source devices5and cools luminous tubes561(seeFIG. 11) configuring the light source devices5. As shown inFIGS. 3 and 4, the cooling device8is disposed on the Y-direction side with respect to the optical-path changing device7. Such a cooling device8includes cooling fans81to84respectively independently driven to suck the cooling gas in the exterior housing2and feed the cooling gas supplied to the light source devices5corresponding to the cooling fans81to84and a box-like housing85in which the cooling fans81to84are disposed.

Note that, as explained in detail below, the cooling gas fed from the cooling fans81and82along the −X direction is supplied to light source devices5A and5B via two flow diverting members DM respectively corresponding to the light source devices5A and5B. The cooling gas fed from the cooling fans83and84along the +X direction is supplied to light source devices5C and5D via two flow diverting members DM respectively corresponding to the light source devices5C and5D.

Configuration of the Lamp Units

Each of the lamp units4A and4B includes the two light source devices5and the light-source attaching member6to which the two light source devices5are attached. Specifically, of the lamp units4A and4B, a first lamp unit4A includes the light source devices5A and5B and a light-source attaching member6A and a second lamp unit4B includes the light source devices5C and5D and a light-source attaching member6B.

Among these components, the configuration of the light source device5is explained in detail below.

The light-source attaching member6(6A,6B) is inserted into and removed from the projector1in a state in which the two light source devices5are attached.

Configuration of the Light-Source Attaching Member

FIG. 5is a perspective view showing the first lamp unit4A.FIG. 6is a perspective view showing the light-source attaching member6A. That is,FIGS. 5 and 6are perspective views of the light-source attaching member6A attached with the light source devices5A and5B and the light-source attaching member6A not attached with the light source devices5respectively viewed from the same direction.

The light-source attaching member6A configuring the first lamp unit4A includes, as shown inFIGS. 5 and 6, a main body section6A1including two attaching sections6A2arranged in series in the Z direction and a gripping section6A9fixed to the main body section6A1.

The gripping section6A9is fixed to the end portion on the −Z-direction side in the main body section6A1. In the gripping section6A9, a handle6A91gripped by the user is provided to be capable of turning about an axis extending along the +Y direction.

In the two attaching sections6A2, the light source devices5are attached along the −X direction with surfaces on the light emission side opposed to each other. The light source device5A is attached to the attaching section6A2on the −Z-direction side and the light source device5B is attached to the attaching section6A2on the +Z-direction side of the attaching sections6A2.

The attaching sections6A2respectively include side surface sections6A3opposed to the surfaces on the light emission side in the light source devices5as shown inFIG. 6. In the side surface sections6A3, opening sections6A4having a substantially circular shape, through which lights emitted from the light source devices5corresponding the side surface sections6A3pass, are formed. That is, the surfaces on the light emission side in the light source devices5are covered by the side surface sections6A3(the light-source attaching members6A).

Besides, the side surface section6A3includes a plurality of bosses6A5and6A6projecting to the light source device5side. At the distal end of the boss6A5, a positioning protrusion inserted into the light source device5to position the light source device5is provided. In the boss6A6, a screw hole in which a screw SR (seeFIGS. 11 and 12) inserted into the light source device5is screwed is formed.

The attaching sections6A2include, in positions on the +Y-direction side, projecting sections6A7projecting to the +X-direction side (the light source device5side). In the projecting section6A7, two terminals6A8connected to connectors5132and5133(seeFIG. 9) provided in the light source device5to supply electric power to the light source device5are provided to correspond to the respective attaching sections6A2.

When the light source device5is attached to the attaching section6A2, first, a surface511F (seeFIG. 9) on the light emission side of the light source device5is directed to the attaching section6A2. The light source device5is attached to the attaching section6A2such that the connectors5132and5133and the terminal6A8are connected. When the light source device5is attached to the attaching section6A2, in a state in which the positioning protrusion of the boss6A5is inserted to position the light source device5, the screw SR inserted through the light source device5is screwed in the screw hole of the boss6A6. Consequently, as shown inFIG. 5, the light source device5is fixed to the attaching section6A2corresponding to the light source device5. That is, the light source device5is attached to the attaching section6A2along a traveling direction of the emitted light of the light source device5(a +N direction explained below).

Note that, in the attaching section6A2located on the −Z-direction side and the attaching section6A2located on the +Z-direction side, positions in the +Y direction are different. Specifically, the attaching section6A2located on the −Z-direction side is located further on the +Y-direction side than the attaching section6A2located on the +Z-direction side. Therefore, of the light source devices5A and5B attached to the attaching sections6A2, the light source device5A is disposed further on the +Y-direction side than the light source device5B.

The light-source attaching member6B of the second lamp unit4B includes, as shown inFIGS. 3 and 4, a main body section6B1same as the main body section6A1of the light-source attaching member6A and a gripping section6B9same as the gripping section6A9.

Of the main body section6B1and the gripping section6B9, the gripping section6B9including a handle6B91is fixed to the end portion on the −Z-direction side in the main body section6B1. That is, when the lamp units4A and4B are disposed to sandwich the optical-path changing device7, the gripping section6A9and6B9are respectively located on the −Z-direction side in the illumination device31.

Although not shown in the figure, the main body section6B1includes two attaching sections that are disposed side by side in series in the +Z direction and to which the light source devices5C and5D are respectively attached. The two attaching sections have a configuration same as the configuration of the attaching section6A2. In the main body section6B1, the attaching section on the +Z-direction side is located further on the +Y-direction side than the attaching section on the −Z-direction side. Consequently, the light source device5D is fixed to a position further on the +Y-direction side than the light source device5C.

That is, when the illumination device31is viewed along the +X direction or the −X direction, the light source devices5A and5C attached to the light-source attaching members6A and6B are disposed to be opposed to each other in positions overlapping in the +Z direction such that traveling directions of emitted lights are opposite directions each other. Similarly, the light source devices5B and5D attached to the light-source attaching members6A and6B are disposed to be opposed to each other in positions overlapping in the +Z direction such that traveling directions of emitted lights are opposite directions each other.

On the other hand, disposition positions in the Y direction of the light source devices5A and5C are different from each other. Disposition positions in the Y direction of the light source devices5B and5D are different from each other. In other words, the light source devices5A and5D are present in the same position in the Y direction. The light source devices5B and5C are present in the same position in the Y direction.

Consequently, it is possible to suppress the emitted light of one of the light source devices5A and5C opposed to each other from being made incident on the other. It is possible to suppress the emitted light of one of the light source devices5B and5D opposed to each other from being made incident on the other.

Configuration of the Flow Diverting Member

FIG. 7is a perspective view of the flow diverting member DM viewed from an inflow side of a cooling gas.FIG. 8is a perspective view of the flow diverting member DM viewed from the inflow side and a side opposed to the light source device5.

In the projecting sections6A7in the main body sections6A1and6B1, the flow diverting members DM, which guide the cooling gas fed from the cooling fans81to84to the light source devices5corresponding to the flow diverting members DM, are respectively provided. The flow diverting members DM include, as shown inFIGS. 7 and 8, a lead-in port DM1, a plurality of duct sections DM2to DM5independent from one another, a channel switching member DM6, and a lead-out port DM7.

The lead-in port DM1is formed in a substantially square shape on a surface opposed to the cooling fan in the flow diverting member DM. One ends of the duct sections DM2to DM5communicate with the inside of the lead-in port DM1. In the lead-in port DM1, the channel switching member DM6, which is a tabular body having a substantially ⅗ circular shape is attached to be capable of rotating about a rotation axis extending along a circulating direction of the cooling gas to the lead-in port DM1. The channel switching member DM6rotates with own weight thereof according to the posture of the projector1to thereby switch, among the duct sections DM3to DM5, a duct section to which a part of the cooling gas led into the lead-in port DM1mainly circulates.

Note that one end of the duct section DM2is located further on an upstream side of the cooling gas than the channel switching member DM6in the lead-in port DM1. Therefore, irrespective of the posture of the projector1, that is, a rotating state of the channel switching member DM6, a part of the cooling gas led into the lead-in port DM1is led into the duct section DM2.

The lead-out port DM7is configured by lead-out ports DM71to DM74formed by the other ends of the duct sections DM2to DM5. Among the lead-out ports DM71to DM74, the lead-out port DM7is formed by the other end of the duct section DM2. The lead-out port DM72is formed by the other end of the duct section DM3. The lead-out port DM73is formed by the other end of the duct section DM4. The lead-out port DM74is formed by the other end of the duct section DM5.

Such a flow diverting member DM feeds the part of the cooling gas led into the lead-in port DM1from the cooling fan corresponding to the light source device5in the cooling device8to the light source device5from the lead-out port DM71via the duct section DM2. The flow diverting member DM feeds, via a duct section among the duct sections DM3to DM5not closed by the channel switching member DM6rotated according to the posture of the projector1, another part of the cooling gas led into the lead-in port DM1to the light source device5from a lead-out port (at least any one of the lead-out ports DM72to DM74) corresponding to the duct section.

Consequently, it is possible to blow the cooling gas from a position corresponding to the posture of the projector1to the luminous tube561of the light source device5explained below.

Configuration of the Optical-Path Changing Device

The optical-path changing device7is disposed between the lamp units4A and4B as shown inFIG. 2. The optical-path changing device7reflects, to the +Z direction side, lights made incident from the light source devices5A and5B along the −X direction and lights made incident from the light source devices5C and5D along the +X direction and makes the lights incident on the equalizing device32.

Such an optical-path changing device7includes the four reflecting mirrors71to74and the four lenses75to78provided to correspond to the light source devices5A to5D and a housing79in which the reflecting mirrors71to74and the lenses75to78are housed on the inside.

The reflecting mirror71is disposed in a position where the emitted light from the light source device5A is made incident. The reflecting mirror72is disposed in a position where the emitted light from the light source device5B is made incident. The reflecting mirror73is disposed in a position where the emitted light from the light source device5C is made incident. The reflecting mirror74is disposed in a position where the emitted light from the light source device5D is made incident. The reflecting mirrors71to74reflect the incident lights to the +Z-direction side.

Note that, as explained above, the light source devices5A and5D are located further on the +Y-direction side than the light source devices5B and5C. Therefore, the reflecting mirrors71and74, on which the lights are made incident from the light source devices5A and5D, are also located further on the +Y-direction side than the reflecting mirrors72and73, on which the lights are made incident from the light source devices5B and5C.

The lenses75to78are provided on optical paths of the lights reflected by the reflecting mirrors71to74corresponding to the lenses75to78. Specifically, when viewed from the +Y-direction side, the lens75is disposed between the reflecting mirrors71and72and collimates the emitted light of the light source device5A reflected by the reflecting mirror71. The lens76is disposed on the +Z-direction side with respect to the reflecting mirror72and collimates the emitted light of the light source device5B reflected by the reflecting mirror72. Similarly, the lens77is disposed between the reflecting mirrors73and74and collimates the emitted light of the light source device5C reflected by the reflecting mirror73. The lens78is disposed on the +Z-direction side with respect to the reflecting mirror74and collimates the emitted light of the light source device5D reflected by the reflecting mirror74.

With such an optical-path changing device7, the emitted lights of the light source devices5A to5D are reflected and collimated by the reflecting mirrors71to74and the lenses75to78and emitted to the +Z-direction side.

Configuration of the Light Source Device

FIG. 9is a perspective view of the light source device5viewed from the light emission side.FIG. 10is a perspective view of the light source device5viewed from the opposite side of the light emission side.FIG. 11is an exploded perspective view of the light source device5viewed from the light emission side.FIG. 12is an exploded perspective view of the light source device5viewed from the opposite side of the light emission side.

As explained above, the light source devices5(5A to5D) are attached to the light-source attaching members6. The light source devices5respectively emit lights toward the optical-path changing device7.

The light source devices5include, as shown inFIGS. 9 and 10, a housing51and further include, as shown inFIGS. 11 and 12, a light blocking member52, an intermediate member53, a collimating lens54, a pressing member55, a light source56, a fixing member57, a light blocking member58, and a plurality of screws SC1and SC2.

Note that, in the following explanation, a traveling direction of light emitted from the light source device5is referred to as +N direction and directions orthogonal to the +N direction and orthogonal to each other are referred to as +L direction and +M direction. In this embodiment, a direction extending along the +Y direction when the light source device5is attached to the light-source attaching member6is referred to as +M direction. A direction extending from the left to the right when the light source device5is viewed from the light emission side with the +M-direction side set on the upper side is referred to as +L direction. That is, in the light source devices5A and5B attached to the light-source attaching member6A, the +N direction coincides with the −X direction, the +M direction coincides with the +Y direction, and the +L direction coincides with the +Z direction. On the other hand, in the light source devices5C and5D attached to the light-source attaching member6B, the +N direction coincides with the +X direction, the +M direction coincides with the +Y direction, and the +L direction coincides with the −Z direction. Note that, although not shown in the figure, for convenience of explanation, the opposite direction of the +N direction is set as a −N direction in the following explanation. The same applies to a −M direction and a −L direction.

Configuration of the Housing

The housing51is a housing for a light source that houses the members52to58on the inside. The housing51is configured by combining the first housing511, the second housing512and a terminal section513, and the intermediate member53explained below. That is, the first housing511and the intermediate member53are combined, whereby the emission side housing51A located on the light emission side from the light source device5in the housing51is configured. The second housing512and the terminal section513are combined, whereby a proximal-end side housing51B located on the opposite side of the light emission side in the housing51is configured.

Configurations of the Second Housing and the Terminal Section

The second housing512and the terminal section513are explained first.

As explained above, the second housing512and the terminal section513are combined with each other to configure the proximal-end side housing51B located on the light-emitting-direction proximal end side (the −N-direction side) in the housing51.

Of the second housing512and the terminal section513, as shown inFIGS. 9 to 12, the terminal section513is formed in a substantial T-shape in which a wide section5131wide in the +L direction is formed on the +M-direction side. In the wide section5131, two connectors5132and5133that supply electric power to the luminous tubes561explained below are provided. The connectors5132and5133are connected to terminal sections (e.g., the terminals6A8) provided in the light-source attaching members6.

The second housing512is a box-like housing having a substantially rectangular parallelepiped shape and is fixed with the terminal section513fit in a concave section5121formed on the end face on the −N-direction side. The end portion on the −N-direction side in the second housing512projects to the +M-direction side. The terminal section513is attached to the second housing512such that the projecting portion and the wide section5131overlap.

Such a second housing512includes an opening section5122having a substantially octagonal shape opened on the +N-direction side. In the opening section5122, the end portion on the −N-direction side in the reflector562configuring the light source56and the light blocking member58formed in a hollow substantially octagonal prism shape are housed.

Note that the light blocking member58is a metal member that suppresses the inside of the second housing512from being deteriorated by an ultraviolet ray and an infrared ray transmitted through the reflector562in the light emitted from the luminous tube561.

Screw holes5123are formed at four corners of the end face on the +N-direction side in the second housing512, that is, around the opening section5122. The screws SC1inserted through the first housing511are screwed in the screw holes5123. Consequently, the second housing512and the first housing511are combined and the housing51is configured.

Note that circulation ports5124and5125for the cooling gas are respectively formed on the side surface on the +L-direction side and the side surface on the −L-direction side in the second housing512. The cooling gas passing through the circulation ports5124and5125passes through circulation ports respectively formed on the side surface on the +L-direction side and the side surface on the −L-direction side in the light blocking member58and cools the end face on the −N-direction side of the reflector562in a process of the circulation.

Configuration of the First Housing

The first housing511is located at the end in the +N direction in the light source device5, combined with the intermediate member53explained below to configure the emission side housing51A, and fixed to the second housing512by the screws SC1from the +N-direction side. That is, when the light source device5is attached to the light-source attaching member6, the first housing511is located on the light-source attaching member6side (the +N-direction side) with respect to the second housing512. The second housing512is located on the opposite side of the light-source attaching member6(the −N-direction side). The first housing511is equivalent to the main body section in the emission side housing51A.

On the surface511F on the +N-direction side in such a first housing511, as shown inFIG. 12, an opening section5111having a substantially circular shape, through which light emitted from the light source56housed in the housing51passes, is formed. The surface511F (the surface511F on the light emission side) is apart opposed to the attaching section (e.g., the attaching section6A2) and covered by the attaching section when the light source device5is attached to the light-source attaching member6.

The first housing511includes a concave housing section5112opened on the −N-direction side. The light blocking member52explained below is disposed in the housing section5112. The intermediate member53is attached to close the housing section5112from the −N-direction side.

On a surface511U on the +M-direction side in the first housing511, lead-in ports5113to5116for leading the cooling gas fed from the flow diverting member DM into the inside are formed to correspond to the lead-out ports DM71to DM74. The cooling gas led into the first housing511via the lead-in ports5113to5116is supplied to the light source56via the intermediate member53.

On a surface511D on the −M-direction side in the first housing511, a discharge port5117(seeFIG. 12) for discharging the cooling gas, which has cooled the light source56, is formed. The discharge port5117is covered by a mesh MS. The mesh MS suppresses, when the luminous tube561is ruptured, broken pieces from scattering from the discharge port5117.

Projecting sections5118are protrudingly provided near both the ends in the +L direction of the surface511U and near both the ends in the +L direction of the surface511D. Specifically, the projecting sections5118located on the surface511U project to the +M-direction side. The projecting sections5118located on the surface511D project to the −M-direction side.

As shown inFIG. 5, the projecting sections5118are located further on the outer side than the second housing512when viewed from the −N-direction side (the +X-direction side in the example shown inFIG. 5). The projecting sections5118are accessible from the −N-direction side without being covered by the second housing512.

Hole sections5119are formed in the respective projecting sections5118. The positioning protrusions of the bosses6A5are inserted into the two hole sections5119among the four hole sections5119. The screws SR (seeFIGS. 11 and 12) are inserted through the other two hole sections5119from the −N-direction side along the +N direction.

Note that insertion holes511A, into which the screws SC1are inserted from the +N-direction side along the −N direction, are respectively formed at the corner sections on the surface511F and in positions further on the center side of the first housing511than the projecting sections5118.

Configuration of the Light Blocking Member

As explained above, the light blocking member52is inserted into the housing section5112from the −N-direction side. The intermediate member53closes the housing section5112from the −N-direction side.

The light blocking member52has a function of protecting the first housing511from light passing through two openings provided across an opening section5345in the light emitted from the luminous tube561on the side surface of an air guide section532of the intermediate member53explained below.

Configuration of the Intermediate Member

FIGS. 13 and 14are exploded perspective views of the intermediate member53, the light source56, and the fixing member57viewed from the light emission side (+N-direction side) and the opposite side of the light emission side (the −N-direction side).FIG. 15is a diagram of the intermediate member53viewed from the +N-direction side.

The intermediate member53closes the housing section5112and configures the emission side housing51A in a state in which the light source56and the fixing member57explained below are attached to the intermediate member53. As shown inFIGS. 13 to 15, the intermediate member53is an integrally molded product including a main body section531having a substantially square shape when viewed from the +N-direction side and an air guide section532, which is the substantial center of the main body section531projecting in a truncated cone shape in the +N direction.

When the intermediate member53is attached to the first housing511, the air guide section532is disposed in the housing section5112. The air guide section532has a function of guiding the cooling gas led into the first housing511to the luminous tube561(seeFIG. 11) located on the inner side of the air guide section532.

As shown inFIGS. 13 and 15, an opening section533having a substantially circular shape is formed on the +N-direction side in the air guide section532. As shown inFIGS. 11 and 12, the collimating lens54is fit in the opening section533. The pressing member55, which presses the collimating lens54, is fixed to the end edge of the opening section533.

As shown inFIGS. 13 and 15, five opening sections534(5341to5345) are formed on the side surface of the air guide section532.

The opening section5341is located on the +M-direction side on the side surface of the air guide section532. The opening section5341causes the cooling gas, which is led in from the lead-in port5113, to flow into the air guide section532from the +M-direction side.

The opening section5342is located on the −N-direction side with respect to the opening section5341. The opening section5342causes the cooling gas, which is led in from the lead-in port5115, to flow into the air guide section532from the +M-direction side.

The opening section5343is located on the +L-direction side on the side surface of the air guide section532. The opening section5343causes the cooling gas, which is led in from the lead-in port5114via a duct section (not shown in the figures) formed by combining the air guide section532and the first housing511, to flow into the air guide section532from the +L-direction side.

The opening section5344is located on the −L-direction side on the side surface of the air guide section532. The opening section5344causes the cooling gas, which is led in from the lead-in port5116via another duct section (not shown in the figures) formed by combining the air guide section532and the light blocking member52, to flow into the air guide section532from the −L-direction side.

The opening section5345is located on the −M-direction side on the side surface of the air guide section532.

The cooling gas, which has passed through the opening sections5342to5344among the opening sections5341to5345, is fed to a light emitting section5611of the luminous tube561explained below. On the other hand, the cooling gas, which has passed through the opening section5341, is fed to a sealing section5613of the luminous tube561.

Consequently, according to the posture of the projector1, it is possible to feed the cooling gas to an upper part (seeFIG. 17) of the light emitting section5611, where temperature is the highest among parts of the luminous tube561, from at least any one of the opening sections5342to5344. Besides, it is possible to feed the cooling gas to the sealing section5613irrespective of the posture of the projector1. Therefore, it is possible to efficiently cool the light emitting section5611. Besides, it is possible to surely cool a connecting section of an electrode drawing wire5617of the sealing section5613and a lead wire (not shown in the figures). The cooling gas, which has cooled the luminous tube561in this way, is fed in the −M direction via the opening section5345functioning as an outflow port, the intermediate member53, and the first housing511.

Hole sections535, through which the screws SC1(seeFIGS. 11 and 12) inserted into the insertion holes511A from the +N-direction side along the −N direction and screwed in the second housing512are inserted, are formed at the respective four corner sections in the main body section531.

Screw holes536, in which the screws SC2for fixing the fixing member57explained below to the intermediate member53are screwed, are formed on one diagonal line in the main body section531and between one corner section and the air guide section532and between a corner section on the opposite side of the corner section and the air guide section532. Further, positioning sections537(FIG. 14), which positions the fixing member57explained below, are protrudingly provided in the −N-direction side in positions across the respective screw holes536.

FIG. 16is a diagram of the intermediate member53viewed from the −N-direction side.

As shown inFIGS. 14 and 16, an annular step section538recessed to the inner side is formed in a proximal end portion of the air guide section532when the intermediate member53is viewed from the −N-direction side. An opening end edge of the reflector562configuring the light source56is fit in the step section538.

Four projecting sections539formed in a substantially rectangular shape are protrudingly provided at equal intervals around the air guide section532on the surface on the −N-direction side of the main body section531. Specifically, the projecting sections539are formed in positions on the ±M-direction side and the ±L-direction side with respect to the air guide section532. The projecting sections539are portions inserted into opening sections574of the fixing member57when the fixing member57explained below is attached to the intermediate member53.

Configuration of the Light Source

The light source56emits light to the +N-direction side. The light source56is pressed and fixed to the intermediate member53side by the fixing member57explained below. The light source56includes, as shown inFIGS. 13 and 14, the luminous tube561and the reflector562.

Configuration of the Luminous Tube

FIG. 17is a diagram showing a cross section taken along an NM plane of the light source56.

The luminous tube561is a light source lamp lit by electric power supplied from the outside. The luminous tube561includes, as shown inFIG. 17, a light emitting section5611bulging in a substantially spherical shape and a pair of sealing sections5612and5613extending from both the ends of the light emitting section5611in directions apart from each other.

On the inside of the light emitting section5611, a discharge space S, in which a pair of electrodes E formed of tungsten is disposed, is formed. A luminescent substance is sealed in the discharge space S. A portion on the +N-direction side (the opposite side of the reflector562) in the light emitting section5611is covered by a sub-reflecting mirror5618that reflects the light, which is emitted from the light emitting section5611on the +N-direction side, to the side of the reflector562functioning as a main reflecting mirror.

The sealing sections5612and5613are sealed in a state in which metal foils5614and5615respectively electrically connected to the electrode E are inserted into the insides of the sealing sections5612and5613. Electrode draw-out wires5616and5617extending to the outside of the luminous tube561are respectively connected to the metal foils5614and5615. When electric power is supplied to the electrode drawing wires5616and5617via lead wires (not shown in the figure), the inside of the light emitting section5611emits light.

Configuration of the Reflector

The reflector562is a cold mirror that reflects visible light in lights made incident from the light emitting section5611and the sub-reflecting mirror5618to the +N-direction side and transmits an infrared ray and an ultraviolet ray in the light. The reflector562includes a reflection surface562A having a concave curved surface shape. The reflector562is a circular reflector, the opening end edge of which is formed in a substantially circular shape when viewed from the +N-direction side and the end portion on the −N-direction side of which is formed in a substantially semispherical shape. As shown inFIG. 17, such a reflector562is fixed to the sealing section5612located on the −N-direction side with respect to the light-emitting section5611by an adhesive.

FIG. 18is a diagram of the reflector562viewed from the −N-direction side.

At the opening end edge of the reflector562, an annular section5621projecting to the outer side in a flange shape is formed. As shown inFIG. 18, the annular section5621is a portion formed in a substantially circular shape when viewed from the −N-direction side, fit in the step section538of the intermediate member53, and pressed by the fixing member57explained below.

Two convex sections5622projecting to the −N-direction side are formed on the surface on the −N-direction side in the annular section5621. Specifically, when the reflector562is viewed from the −N-direction side, the two convex sections5622are respectively provided in positions 90° apart from each other centering on a disposition position of the luminous tube561.

Configuration of the Fixing Member

FIG. 19is a diagram of the fixing member57viewed from the −N-direction side.

The fixing member57is fixed to the intermediate member53by the screws SC2while pressing the reflector562against the intermediate member53. As shown inFIGS. 13, 14, and19, the fixing member57is formed by bending a sheet metal and has a substantially square shape when viewed from the −N-direction side.

The opening section571is formed in a substantially circular shape substantially in the center of the fixing member57. A part on the −N-direction side of the reflector562is inserted into the opening section571. Note that an inner diameter dimension of the opening section571is set smaller than an outer diameter dimension of the reflector562. Therefore, when the part on the −N-direction side of the reflector562is inserted into the opening section571, the annular section5621is brought into contact with the end edge of the opening section571.

The concave sections572are formed at the end edge of the opening section571and in positions corresponding to two of the four corner sections of the fixing member57. Specifically, the two concave sections572are formed in positions 90° apart from each other when centering on the center of the opening section571. In other words, a first concave section5721of the two concave sections572is formed in a position corresponding to the corner section on the +L-direction side and the +M-direction side at the end edge of the opening section571. A second concave section5722is formed in a position corresponding to the corner section on the +L-direction side and the −M-direction side at the end edge of the opening section571. The convex sections5622fit in the concave sections5721and5722when the reflector562is inserted into the opening section571. Consequently, the reflector562having a circular shape is suppressed from rotating about a rotation axis extending along the +N direction in a state in which the reflector562is engaged with the fixing member57.

The pressing section573is an urging section (a leaf spring section) that presses and urges the reflector562, which is inserted into the opening section571, toward the end edge of the opening section571and regulates the swing of the reflector562. The pressing section573is disposed in a position on the opposite side of the second concave section5722(a position on the −L-direction side and the M-direction side) at the end edge of the opening section571. Such a pressing section573presses and urges the reflector562to the second concave section5722side.

The opening sections574are formed in substantially the centers of the side edges of the fixing member57when viewed from the −N-direction side. The projecting sections539of the intermediate member53are inserted into the four opening sections574. That is, the opening sections574are insertion sections into which the projecting sections539are inserted.

The expanding/reducing sections575are located at the side edges of the fixing member57and extend to the −N-direction side. Apart of the expanding/reducing sections575form the end edges on the outer side in the opening sections574(the outer side with respect to the center of the fixing member57). Therefore, when the expanding/reducing sections575are bent to the center side of the fixing member57(turned to the center side about the side edges), the opening sections574are expanded in diameter. When the expanding/reducing sections575are returned to the original state thereof in a state in which the opening sections574are expanded in diameter, the opening sections574are reduced in diameter.

In a state in which the expanding/reducing sections575are operated and the opening sections574are expanded in diameter in this way, the projecting sections539are inserted into the opening sections574. In a state in which the corresponding projecting sections539are inserted into the opening sections574, when the positions of the expanding/reducing sections575are returned to the original positions by, for example, releasing a hand, the opening sections574are reduced in diameter and the projecting sections539are held by the end edges of the corresponding opening sections574. Consequently, the fixing member57is provisionally fixed to the intermediate member53.

Note that the distal end portion of each of the four expanding/reducing sections575inclines to the center side. It is easy to bend the expanding/reducing section575gripped by the user. The expanding/reducing sections575also function as blocking sections that block an ultraviolet ray and an infrared ray passed through the reflector562.

The positioning holes576are formed in positions corresponding to the positioning sections537of the intermediate member53. The positioning sections537are inserted into the positioning holes576. Consequently, the fixing member57is positioned with respect to the intermediate member53.

The insert-through holes577and pairs of flexible sections578are respectively formed by cutout in the vicinities of two corner sections located on the same diagonal line in the fixing member57.

The screws SC2for fixing the fixing member57to the intermediate member53are inserted through the insert-through holes577of the insert-through holes577and the pairs of flexible sections578from the −N-direction side.

The pairs of flexible sections578form the end edges of the insert-through holes577with parts of the end edges opposed to each other of the pairs of flexible sections578. The pairs of flexible sections578have flexibility to the ±N direction centering on the end portions on the opposite side of the insert-through holes577, that is, connecting parts to the fixing member57. Therefore, even when the positions of the insert-through holes577, through which the screws SC2are inserted, and the positions of the screw holes536, in which the screws SC2are screwed in the intermediate member53, deviate because of, for example, dimension tolerance of a component, since the pairs of flexible sections578bend, it is possible to adjust the positions of the insert-through holes577and align the positions of the insert-through holes577and the positions of the screw holes536.

Attachment of the Light Source and the Fixing Member to the Intermediate Member

FIG. 20is a diagram of the intermediate member53attached with the light source56and the fixing member57viewed from the −N-direction side.

When the light source56is fixed to the intermediate member53by the fixing member57, the light source56is fixed according to a procedure explained below.

First, a part of the reflector562is inserted into the opening section571of the fixing member57. The two convex sections5622of the reflector562are fit in the concave sections572of the fixing member57. In this state, the opening end edge of the reflector562is fit in the step section538of the intermediate member53and the positioning sections537are inserted into the positioning holes576to attach the fixing member57to the intermediate member53from the −N-direction side.

FIG. 21is a diagram of the intermediate member53attached with the light source56and the fixing member57viewed from the +N-direction side. Note that, inFIG. 21, the collimating lens54and the pressing member55fixed to the intermediate member53are not shown.

In a state in which the expanding/reducing sections575are bent and the opening sections574are expanded in diameter in the fixing member57, the projecting sections539are inserted into the opening sections574. The opening sections574are reduced in diameter by returning the expanding/reducing sections575to the original state. The projecting sections539are held by the end edges of the opening sections574. Consequently, the fixing member57and the light source56are provisionally fixed to the intermediate member53.

Thereafter, the two screws SC2are inserted into the insert-through holes577corresponding to the screws SC2from the −N-direction side and further screwed in the screw holes536formed in the intermediate member53. Consequently, as shown inFIGS. 20 and 21, the fixing member57and the light source56are fixed to the intermediate member53.

Assembly of the Light Source Device

When the light source device5is assembled, for example, as shown inFIG. 11, the first housing511(the emission side housing51A), in which the housing section5112disposed with the light blocking member52is closed by the intermediate member53, and the second housing512(the proximal-end side housing51B) attached with the light blocking member58and the terminal section513are fixed by the screws SC1. When the first housing511and the second housing512are fixed by the screws SC1, the screws SC1are inserted into the insertion holes511A of the first housing511from the +N-direction side along the −N direction and screwed in the screw holes5123of the second housing512.

Consequently, the light source device5is assembled.

Attachment of the Light Source Device to the Light-Source Attaching Member

The light source device5is attached to the light-source attaching member6as explained above.

For example, as shown inFIGS. 5 and 6, the light source devices5A and5B are attached to the attaching sections6A2of the light-source attaching member6A along the −X direction. The light source devices5A and5B are fixed to the attaching sections6A2when the screws SR (seeFIGS. 11 and 12) inserted through the hole sections5119formed in the projecting sections5118along the −X direction are screwed with screw holes (not shown in the figure) of the bosses6A6protrudingly provided in the attaching sections6A2.

When the light source devices5C and5D are fixed to the attaching section of the light-source attaching member6B, similarly, the light source devices5C and5D are attached and fixed to the attaching section along the +X direction.

That is, the light source devices5A and5B are fixed to the light-source attaching member6A by the screws SR inserted along the +N direction for the light source devices5A and5B. The light source devices5C and5D are fixed to the light-source attaching members6B by the screws SR inserted along the +N direction for the light source devices5C and5D.

In this way, an inserting direction of the screws SR for fixing the light source device5to the light-source attaching member6and an inserting direction of the screws SC1for fixing the first housing511and the second housing512are opposite directions each other. An insertion side of the screws SR and an insertion side of the screws SC1into the light source device5are opposite sides each other. In other words, a removing direction of the screws SR from the light source device5and a removing direction of the screws SC1from the light source device5are opposite directions each other. The surface511F, on which the screws SC1are disposed, is covered by the light-source attaching member6. Therefore, when the light source device5is viewed from an attachment side of the light source device5to the light-source attaching member6, that is, a removing side of the screws SR, the screws SC1are not visually recognized.

Consequently, when the light source device5is detached from the light-source attaching member6, it is possible to suppress a situation in which the screws SC1are removed by mistake and the second housing512is separated from the first housing511while the first housing511is kept fixed to the light-source attaching member6.

With the projector1according to this embodiment explained above, there are effects explained below.

The removing direction of the screws SR functioning as the first fixture for fixing the light source device5to the light-source attaching member6functioning as the attachment member and the removing direction of the screws SC1functioning as the second fixture for fixing the first housing511and the second housing512are different. Consequently, in the example of the light source device5(5A,5B) attached to the light-source attaching member6A, as shown inFIG. 5, when the light source device5is viewed from the removing direction side of the screws SR (the +X-direction side), it is possible to make it difficult to visually recognize the screws SC1. The same holds true in the light source devices5C and5D attached to the light-source attaching member6B. Therefore, when the screws SR are removed to detach the light source device5from the light-source attaching member6, it is possible to suppress the screws SC1from being removed by mistake. It is possible to appropriately detach the light source device5from the light-source attaching member6.

The screws SR are inserted into the light source device5and the light-source attaching member6along the direction in which the light-source attaching member6is located with respect to the light source device5(the +N direction). The screws SC1are inserted into the first housing511and the second housing512along the opposite direction of the inserting direction of the screws SR (−N direction). Consequently, as explained above, when the light source device5is viewed from the removing direction side of the screws SR (the −N-direction side), it is possible to make it more difficult to visually recognize the screws SC1. Consequently, it is possible to surely suppress the screws SC1from being removed when the light source device5is detached from the light-source attaching member6. Therefore, it is possible to appropriately detach the light source device5from the light-source attaching member6.

The first housing511(the emission side housing51A) is located on the light-source attaching member6side in the housing51. The second housing512(the proximal-end side housing51B) is located on the opposite side of the light-source attaching member6in the housing51. The screws SR are inserted into the bosses of the light-source attaching member6(the bosses6A6in the light-source attaching member6A) from the second housing512side. The screws SC1are inserted into the second housing512from the first housing511side. Consequently, it is possible to surely set the respective inserting directions of the screws SR and SC1to opposite directions each other. In other words, it is possible to surely set the respective removing directions of the screws SR and SC1to opposite directions each other. Therefore, when the screws SR are removed, it is possible to more surely make it difficult to visually recognize the screws SC1. It is possible to surely suppress the screws SC1from being removed.

The first housing511includes the insertion holes511A, into which the screws SC1are inserted, on the surface511F opposed to the light-source attaching member6. When the light source device5is attached to the light-source attaching member6, the surface511F and the screws SC1inserted into the insertion holes511A are covered by the light-source attaching member6. Consequently, when the light source device5is detached from the light-source attaching member6, it is possible to more surely suppress the screws SC1from being visually recognized. Therefore, it is possible to more surely suppress the screws SC1from being removed when the light source device5is detached. It is possible to appropriately detach the light source device5from the light-source attaching member6.

When the hole sections, through which the screws SR fixed to the light-source attaching member6are inserted, are located in the second housing512apart from the light-source attaching member6, a dimension between the hole sections and the light-source attaching member6is long. In such a case, it is necessary to adopt relatively long screws SR. Moreover, it is difficult to stably fix the light source device5to the light-source attaching member6.

On the other hand, when the hole sections5119, through which the screws SC1inserted from the second housing512side and fixed to the light-source attaching member6are inserted, are located in the first housing511, compared with the case described above, it is possible to reduce a dimension between the hole sections5119and the light-source attaching member6. Therefore, it is possible to adopt relatively short screws SR. It is possible to stably fix the light source device5to the light-source attaching member6.

The first housing511includes the projecting sections5118projecting further to the outer side than the second housing512when viewed from an attachment side of the light source device5to the light-source attaching member6(the −N-direction side; the +X-direction side in the light source devices5A and5B and the −X-direction side in the light source devices5C and5D). The hole sections5119, through which the screws SR are inserted, are located in the projecting sections5118. Consequently, on the attachment side of the light source device5to the light-source attaching member6, it is possible to easily insert and remove the screws SR into and from the hole sections5119and it is possible to easily insert and remove the screws SR into and from the light-source attaching member6. Therefore, it is possible to easily attach and detach the light source device5to and from the light-source attaching member6.

The first housing511is located on the emission side of light emitted by the light source device5(the +N-direction side) with respect to the second housing512. Consequently, since the light source device5is disposed such that the first housing511located on the light emission side in the light source device5is opposed to the light-source attaching member6, it is possible to easily carry out adjustment of an emission position of light from the light source device5with respect to the light-source attaching member6. Therefore, it is possible to easily and appropriately adjust a traveling direction of light emitted from the illumination device31.

The illumination device31includes the light-source attaching member6A to which the light source devices5A and5B are attached, the light-source attaching member6B to which the light source devices5C and5D are attached, and the optical-path changing device7that changes optical paths of lights emitted from the light source devices5A to5D and emits the lights. Consequently, it is possible to align the lights emitted from the light source devices5A to5D in the +Z direction with the optical-path changing device7and emit the lights. Therefore, it is possible to make it easy to effectively use the lights emitted from the light source devices5A to5D. It is possible to increase the luminance of a projected image.

Note that, when the illumination device31includes one light-source attaching member6to which a plurality of light source devices5can be attached and when one light source device5is provided in each of the light-source attaching members6, it is possible to align lights emitted from the light source devices5in the +Z direction with the optical-path changing device7and emit the lights. In these configurations, it is also possible achieve the effects explained above.

The fixing member57is attached to the intermediate member53configuring the emission side housing51A in a state in which the reflector562is fixed. Consequently, it is possible to easily attach the reflector562to the intermediate member53. Therefore, since it is possible to adopt a round reflector as the reflector562, compared with when the square reflector is adopted, it is easy to condense reflected lights and align the reflected lights in one direction and equalize the thickness of the reflector562. Therefore, it is possible to improve light use efficiency of light emitted from the light emitting section5611. Besides, it is possible to improve easiness of manufacturing of the light source device5.

The reflector562includes the convex sections5622projecting toward the outer side. The fixing member57includes the opening section571into which a part of the reflector562is inserted and the concave sections572that is located at the end edge of the opening section571and in which the convex sections5622fit. Consequently, when the end portion on the −N-direction side in the reflector562is inserted into the opening section571from the +N-direction side, since the convex sections5622fit in the concave sections572, it is possible to suppress the rotation of the reflector562about the axis extending along the +N direction. Therefore, it is possible to stably attach the reflector562to the intermediate member53.

The fixing member57includes the pressing section573that presses the reflector562to the concave sections572side in which the convex sections5622fit. Consequently, it is possible to surely suppress the swing and the rotation of the reflector562. Therefore, it is possible to more stably fix the reflector562.

The intermediate member53configuring the emission side housing51A includes the projecting sections539that project to the fixing member57side. The fixing member57includes the opening sections574, which are the insertion sections into which the projecting sections539are inserted. Consequently, it is possible to accurately position the fixing member57, to which the reflector562is fixed, with respect to the intermediate member53. Therefore, it is possible to attach the fixing member57and the reflector562to appropriate positions of the intermediate member53(the emission side housing51A).

The fixing member57includes the expanding/reducing sections575that expand and reduce the inner diameter of the opening sections574and cause the end edges of the opening sections574to hold the projecting sections539. Consequently, since the projecting sections539can be held by the end edges of the opening sections574expanded and reduced by the expanding/reducing sections575, it is possible to provisionally fix the fixing member57to the intermediate member53. Therefore, it is possible to more surely attach the fixing member57and the reflector562to appropriate positions of the intermediate member53(the emission side housing51A). Besides, it is possible to easily perform a process for attaching the reflector562and the fixing member57to the intermediate member53(the emission side housing51A).

The expanding/reducing sections575extend to the opposite side of the intermediate member53in the fixing member57. When the expanding/reducing sections575are displaced to the center side of the fixing member57(the center side of the opening section571), the opening sections574are expanded in diameter. When the expanding/reducing sections575are displaced to the opposite side of the center of the fixing member57(the outer side) (returns to the original positions), the opening sections574are reduced in diameter. Consequently, it is possible to easily expand and reduce the opening sections574. It is possible to easily carry out operation for inserting the projecting sections539into the opening sections574and operation for causing the end edges of the opening sections574to hold the projecting sections539inserted into the opening sections574. Therefore, it is possible to easily provisionally fix the fixing member57to the intermediate member53.

The fixing member57includes the insert-through holes577, through which the screws SC2functioning as fixtures for fixing the fixing member57to the intermediate member53, are inserted and the flexible sections578cut out and formed continuously to the insert-through holes577and forming the end edges of the insert-through holes577. Consequently, even when tolerance occurs in a component dimension of at least one of the fixing member57and the intermediate member53, since the flexible sections578bend, it is possible to align the positions of the insert-through holes577with the positions of the screw holes546and absorb the tolerance. Therefore, it is possible to surely attach the fixing member57to the intermediate member53.

The emission-side housing51A includes the first housing511functioning as a main body section combined with the second housing512of the proximal-end side housing51B and the intermediate member53to which the light source56and the fixing member57are attached. The intermediate member53includes the air guide section532disposed on the inner side of the first housing511to guide the cooling gas to the light-emitting section5611of the luminous tube561. The air guide section532includes the step section538in which the opening end edge of the reflector562is fit. Consequently, it is possible to suppress a leak of the cooling gas guided by the air guide section532. It is possible to efficiently guide the cooling gas to the light emitting section5611. Therefore, it is possible to improve cooling efficiency of the light emitting section5611.

In a state in which the reflector562is fixed to the fixing member57, the fixing member57is attached to the intermediate member53configuring the emission side housing51A. Consequently, it is possible to easily attach the reflector562to the intermediate member53. Therefore, since a round reflector can be adopted as the reflector562, compared with when a square reflector is adopted, it is easy to condense reflected lights and align the reflected lights in one direction and equalize the thickness of the reflector562. Therefore, it is possible to improve light use efficiency of light emitted from the light emitting section5611. Besides, it is possible to improve easiness of manufacturing of the light source device5.

The reflector562includes the convex sections5622projecting to the outer side. The fixing member57includes the opening section571into which a part of the reflector562is inserted and the concave sections572that are located at the end edge of the opening section571and in which the convex sections5622fit. Consequently, when the end portion on the −N-direction side in the reflector562is inserted into the opening section571from the +N-direction side, since the convex sections5622fit in the concave sections572, it is possible to suppress the rotation of the reflector562about the axis extending along the +N direction. Therefore, it is possible to stably attach the reflector562to the intermediate member53.

The fixing member57includes the pressing section573that presses the reflector562to the concave sections572side in which the convex sections5622fit. Consequently, it is possible to surely suppress the swing and the rotation of the reflector562. Therefore, it is possible to more stably fix the reflector562.

The intermediate member53configuring the emission side housing51A includes the projecting sections539projecting to the fixing member57side. The fixing member57includes the opening sections574, which are insertion sections into which the projecting sections539are inserted. Consequently, it is possible to accurately position the fixing member57, to which the reflector562is fixed, with respect to the intermediate member53. Therefore, it is possible to attach the fixing member57and the reflector562to appropriate positions of the intermediate member53(the emission side housing51A).

The fixing member57includes the expanding/reducing sections575that expand and reduce the inner diameter of the opening sections574and cause the end edges of the opening sections574to hold the projecting sections539. Consequently, since the projecting sections539can be held by the end edges of the opening sections574expanded and reduced by the expanding/reducing sections575, it is possible to provisionally fix the fixing member57to the intermediate member53. Therefore, it is possible to more surely attach the fixing member57and the reflector562to appropriate positions of the intermediate member53(the emission side housing51A). Besides, it is possible to easily perform a process for attaching the reflector562and the fixing member57to the intermediate member53(the emission side housing51A).

The expanding/reducing sections575extend to the opposite side of the intermediate member53in the fixing member57. When the expanding/reducing sections575are displaced to the center side of the fixing member57(the center side of the opening section571), the opening sections574are expanded in diameter. When the expanding/reducing sections575are displaced to the opposite side of the center of the fixing member57(the outer side) (returns to the original positions), the opening sections574are reduced in diameter. Consequently, it is possible to easily expand and reduce the opening sections574. It is possible to easily carry out operation for inserting the projecting sections539into the opening sections574and operation for causing the end edges of the opening sections574to hold the projecting sections539inserted into the opening sections574. Therefore, it is possible to easily provisionally fix the fixing member57to the intermediate member53.

The fixing member57includes the insert-through holes577, through which the screws SC2functioning as fixtures for fixing the fixing member57to the intermediate member53, are inserted and the flexible sections578cut out and formed continuously to the insert-through holes577and forming the end edges of the insert-through holes577. Consequently, even when tolerance occurs in a component dimension of at least one of the fixing member57and the intermediate member53, since the flexible sections578bend, it is possible to align the positions of the insert-through holes577with the positions of the screw holes546and absorb the tolerance. Therefore, it is possible to surely attach the fixing member57to the intermediate member53.

The emission-side housing51A includes the first housing511functioning as a main body section combined with the second housing512of the proximal-end side housing51B and the intermediate member53to which the light source56and the fixing member57are attached. The intermediate member53includes the air guide section532disposed on the inner side of the first housing511to guide the cooling gas to the light-emitting section5611of the luminous tube561. The air guide section532includes the step section538in which the opening end edge of the reflector562is fit. Consequently, it is possible to suppress a leak of the cooling gas guided by the air guide section532. It is possible to efficiently guide the cooling gas to the light emitting section5611. Therefore, it is possible to improve cooling efficiency of the light emitting section5611.

The removing direction of the screws SR functioning as the first fixture for fixing the light source device5to the light-source attaching member6functioning as the attachment member and the removing direction of the screws SC1functioning as the second fixture for fixing the first housing511and the second housing512are different. Consequently, in the example of the light source device5(5A and5B) attached to the light-source attaching member6A, as shown inFIG. 5, when the light source device5is viewed from the removing direction side of the screws SR (the +X-direction side), it is possible to make it difficult to visually recognize the screws SC1. The same holds true in the light source devices5C and5D attached to the light-source attaching member6B. Therefore, when the screws SR are removed to detach the light source device5from the light-source attaching member6, it is possible to suppress the screws SC1from being removed by mistake. It is possible to appropriately detach the light source device5from the light-source attaching member6.

The screws SR are inserted into the light source device5and the light-source attaching member6along the direction in which the light-source attaching member6is located with respect to the light source device5(the +N direction). The screws SC1are inserted into the first housing511and the second housing512along the opposite direction of the inserting direction of the screws SR (the −N direction). Consequently, as explained above, when the light source device5is viewed from the removing direction side of the screws SR (the −N-direction side), it is possible to make it more difficult to visually recognize the screws SC1. Consequently, it is possible to surely suppress the screws SC1from being removed when the light source device5is detached from the light-source attaching member6. Therefore, it is possible to appropriately detach the light source device5from the light-source attaching member6.

The first housing511(the emission side housing51A) is located on the light-source attaching member6side in the housing51. The second housing512(the proximal-end side housing51B) is located on the opposite side of the light-source attaching member6in the housing51. The screws SR are inserted into the bosses of the light-source attaching member6(the bosses6A6in the light-source attaching member6A) from the second housing512side. The screws SC1are inserted into the second housing512from the first housing511side. Consequently, it is possible to surely set the respective inserting directions of the screws SR and SC1to opposite directions each other. In other words, it is possible to surely set the respective removing directions of the screws SR and SC1to opposite directions each other. Therefore, when the screws SR are removed, it is possible to more surely make it difficult to visually recognize the screws SC1. It is possible to surely suppress the screws SC1from being removed.

The first housing511includes the insertion holes511A, into which the screws SC1are inserted, on the surface511F opposed to the light-source attaching member6. When the light source device5is attached to the light-source attaching member6, the surface511F and the screws SC1inserted into the insertion holes511A are covered by the light-source attaching member6. Consequently, when the light source device5is detached from the light-source attaching member6, it is possible to more surely suppress the screws SC1from being visually recognized. Therefore, it is possible to more surely suppress the screws SC1from being removed when the light source device5is detached. It is possible to appropriately detach the light source device5from the light-source attaching member6.

When the hole sections, through which the screws SR fixed to the light-source attaching member6are inserted, are located in the second housing512apart from the light-source attaching member6, a dimension between the hole sections and the light-source attaching member6is long. In such a case, it is necessary to adopt relatively long screws SR. Moreover, it is difficult to stably fix the light source device5to the light-source attaching member6.

On the other hand, when the hole sections5119, through which the screws SC1inserted from the second housing512side and fixed to the light-source attaching member6are inserted, are located in the first housing511, compared with the case described above, it is possible to reduce a dimension between the hole sections5119and the light-source attaching member6. Therefore, it is possible to adopt relatively short screws SR. It is possible to stably fix the light source device5to the light-source attaching member6.

The first housing511includes the projecting sections5118projecting further to the outer side than the second housing512when viewed from an attachment side of the light source device5to the light-source attaching member6(the −N-direction side; the +X-direction side in the light source devices5A and5B and the −X-direction side in the light source devices5C and5D). The hole sections5119, through which the screws SR are inserted, are located in the projecting sections5118. Consequently, on the attachment side of the light source device5to the light-source attaching member6, it is possible to easily insert and remove the screws SR into and from the hole sections5119and it is possible to easily insert and remove the screws SR into and from the light-source attaching member6. Therefore, it is possible to easily attach and detach the light source device5to and from the light-source attaching member6.

The first housing511is located on the emission side of light emitted by the light source device5(the +N-direction side) with respect to the second housing512. Consequently, since the light source device5is disposed such that the first housing511located on the light emission side in the light source device5is opposed to the light-source attaching member6, it is possible to easily carry out adjustment of an emission position of light from the light source device5with respect to the light-source attaching member6. Therefore, it is possible to easily and appropriately adjust a traveling direction of light emitted from the illumination device31.

The illumination device31includes the light-source attaching member6A to which the light source devices5A and5B are attached, the light-source attaching member6B to which the light source devices5C and5D are attached, and the optical-path changing device7that changes optical paths of lights emitted from the light source devices5A to5D and emits the lights. Consequently, it is possible to align the lights emitted from the light source devices5A to5D in the +Z direction with the optical-path changing device7and emit the lights. Therefore, it is possible to make it easy to effectively use the lights emitted from the light source devices5A to5D. It is possible to increase the luminance of a projected image.

Note that, when the illumination device31includes one light-source attaching member6to which a plurality of light source devices5can be attached and when one light source device5is provided in each of the light-source attaching members6, it is possible to align lights emitted from the light source devices5in the +Z direction with the optical-path changing device7and emit the lights. In these configurations, it is also possible achieve the effects explained above.

Modifications of the Embodiment

The invention is not limited to the embodiment. Modifications, improvements, and the like in a range in which the object of the invention can be attained are included in the invention.

In the embodiment, the light source device5is attached to the light-source attaching member6inserted and removed into and from the exterior housing2. However, the invention is not limited to this. That is, the attachment member, to which the light source device5is attached, may be a light-source attaching member (a light-source housing member) fixed in the exterior housing2. The light-source attaching member6does not have to be configured such that the plurality of light source devices are detachably attachable to the light-source attaching member6. The number of light source devices5attachable to the light-source attaching member6may be any number. Further, two light-source attaching members6may not be provided in the projector1. The number of light-source attaching members6may be one or may be three or more.

In the embodiment, the screws SR are adopted as the fixtures for fixing the light source device5to the light-source attaching member6. The screws SC1are adopted as the fixtures for fixing the first housing511and the second housing512configuring the housing51of the light source device5. Further, the screws SC2are adopted as the fixtures for fixing the fixing member57to the intermediate member53. However, the invention is not limited to this. That is, the fixtures may be other fastening members such as bolts.

In the embodiment, the screws SR are inserted through the hole sections5119of the light source device5along the +N direction and screw in the attaching sections of the light-source attaching member6. The screws SC1are inserted through the insertion holes511A of the first housing511in the −N direction and screw in the screw holes5123of the second housing512. However, the invention is not limited to this. That is, the inserting direction (the removing direction) of the fixtures into (from) the light-source attaching member6and the inserting direction (the removing direction) of the fixtures into (from) the housing51are not limited to the opposite directions each other and only have to be different. For example, the inserting directions (the removing directions) of the fixtures may be orthogonal.

In the embodiment, the first housing511includes the insertion holes511A, through which the screws SC1are inserted, on the surface511F covered by the light-source attaching member6when the light source device5is attached to the light-source attaching member6. However, the invention is not limited to this. That is, the surface511F, on which the insertion holes511A are formed, does not have to be covered by the light-source attaching member6. The insertion holes511A may be located on other surfaces.

In the embodiment, the first housing511includes the hole sections5119through which the screws SR for fixing the light source device5to the light-source attaching member6are inserted. The second housing512do not include such hole sections. However, the invention is not limited to this. That is, the hole sections, through which the screws SR are inserted, may be formed in only the second housing512or may be formed in each of the first housing511and the second housing512.

In the embodiment, the projecting sections5118, in which the hole sections5119are formed in the first housing511, project further to the +M direction and the −M direction than the second housing512when viewed from the −N-direction side. However, the invention is not limited to this. For example, the projecting sections5118may project to at least one of the +L-direction side and the −L-direction side. Apart where the hole sections5119are formed in the first housing511may be formed larger than the second housing512. Alternatively, the hole sections5119may be formed in positions covered by the second housing512.

In the embodiment, the light source device5is attached to the light-source attaching member6such that the first housing511is disposed on the light-source attaching member6side with respect to the second housing512. However, the invention is not limited to this. For example, the light source device may be attached to the light-source attaching member such that the second housing is located further on the light-source attaching member side than the first housing. That is, for example, in the example shown inFIG. 5, the light source device5(5A,5B) may be attached to the light-source attaching member6A such that the emitting direction of light is the +X direction. In this case, the removing direction of the fixtures (the screws SR) for fixing the light source device5to the light-source attaching member6only has to be set to a direction along the +X direction (the +N direction). The removing direction of the fixtures (the screws SC1) for fixing the first housing511and the second housing512only has to be set to a direction along the −X direction (the −N direction).

In the embodiment, the illumination device31includes the optical-path changing device7that aligns the lights emitted from the plurality of light source devices5(5A to5D) in the +Z direction and emits the lights. However, the invention is not limited to this. The optical-path changing device does not have to be provided. The configuration of the optical-path changing device is not limited to the configuration of the optical-path changing device7.

In the embodiment, the light source56(the reflector562) is attached and fixed to, by the fixing member57, the intermediate member53configuring the emission side housing51A. However, the invention is not limited to this. For example, the light source56(the reflector562) may be attached and fixed to the first housing511by the fixing member57. That is, a member to which the reflector562is attached may be any member as long as the reflector562is attached and fixed to, by the fixing member, the emission side housing located on the emission direction side of light reflected by the reflector562.

In the embodiment, the housing51is configured by combining the emission side housing51A and the proximal-end side housing51B. However, the invention is not limited to this. The proximal-end side housing51B does not have to be provided.

In the embodiment, the reflector562includes the two convex sections5622. The fixing member57, into the opening section571of which the reflector562is inserted, includes the two concave sections572, in which the two convex sections5622are fit, at the end edge of the opening section571. However, the invention is not limited to this. That is, the number of convex sections5622is not limited to two. The number of concave sections572, into which the convex sections5622are inserted, is not limited to two either. For example, the reflector562may include one convex section5622. The fixing member57may include one concave section572. The fixing member may include the convex sections and the reflector may include the concave sections. Further, if the rotation of the reflector562is suppressed by another component (e.g., the pressing section573), the convex sections and the concave sections do not have to be provided.

In the embodiment, the fixing member57includes, at the end edge of the opening section571, the pressing section573that presses and urges the reflector562to the concave sections572side in which the convex sections5622fit. However, the invention is not limited to this. For example, the position of the pressing section573is not limited to the end edge of the opening section571and may be another part. The pressing direction of the reflector562by the pressing section573may be another direction. For example, the pressing direction may be the concave sections572side located on the +L-direction side and the +M-direction side or may be the +L-direction side, the +M-direction side, or the −M-direction side. In these directions, the swing of the reflector562is regulated while a state in which the convex sections5622fit in the concave sections572is maintained.

In the embodiment, the four projecting sections539formed in the intermediate member53are inserted into the opening sections574corresponding to the projecting sections539in the fixing member57and are held by the end edges of the opening sections574. Consequently, the fixing member57is provisionally fixed to the intermediate member53. However, the invention is not limited to this. For example, the number of projecting sections539and opening sections574and the number of expanding/reducing sections575are not limited to four and can be changed as appropriate. Disposition positions of these sections can also be changed as appropriate. Note that, if at least pairs of the projecting sections539, the opening sections574, and the expanding/reducing sections575are provided in positions across the center of the opening section571, the fixing member57is stably provisionally fixed.

When the projecting sections539and the opening sections574are used for the positioning of the fixing member57with respect to the intermediate member53, the projecting sections539do not have to be held by the end edges of the opening sections574. In this case, the expanding/reducing sections575can be omitted.

In the embodiment, in the fixing member57, the insert-through holes577, through which the screws SC2screwing in the intermediate member53to fix the fixing member57to the intermediate member53are inserted, and the pair of flexible sections578forming the end edges of the insert-through holes577, are formed by cutout. However, the invention is not limited to this. For example, the pair of flexible sections578does not have to be provided. By setting an inner diameter dimension of the insert-through holes577large in a range in which the inner diameter dimension is smaller than an outer diameter dimension of the heads of the screws SC2, tolerance of the component dimensions may be absorbed.

In the embodiment, the step section538, in which the opening end edge of the reflector562is fit, is formed on the inner side of the air guide section532in the intermediate member53. However, the invention is not limited to this. For example, such a step section538does not have to be provided.

In the embodiment, the light source56includes the luminous tube561and the reflector562. However, the invention is not limited to this. For example, a solid-state light source such as an LED (Light Emitting Diode) or an LD (Laser Diode) may be adopted instead of the luminous tube561. Concerning the difference between the removing direction of the screws SR for fixing the light source device5to the light-source attaching member6and the removing direction of the screws SC1for fixing the first housing511and the second housing512configuring the housing51of the light source device5, the reflector562may be the square reflector rather than the circular reflector.

In the embodiment, the liquid crystal panels341(341R,341G, and341B) of a transmission type are used as the light modulating devices. However, the invention is not limited to this. Liquid crystal panels of a reflection type may be adopted as the light modulating devices. In this case, the respective functions of the color separating device33and the color combining device344may be performed by one prism.

Further, it is also possible to adopt, as the light modulating devices, light modulating devices other than liquid crystal such as devices including micromirrors, for example, DMDs (Digital Micromirror Devices).

In the embodiment, the projector1includes the three liquid crystal panels341. However, the invention is not limited to this. That is, the invention is also applicable to a projector including two or less or four or more liquid crystal panels.

In the embodiment, the disposition of the optical components configuring the image forming device3is the disposition shown inFIG. 2. However, the invention is not limited to this. For example, an image forming device configured in a substantial L-shape or a substantial U-shape may be adopted. The disposition of the optical components configuring the image forming device3and the types and the numbers of the optical components can be changed as appropriate.

In the embodiment, the example is explained in which the light source device and the illumination device of the invention are applied to the projector1. However, the invention is not limited to this. It is also possible to apply the light source device and the illumination device of the invention as, for example, light source devices of a luminaire and an automobile.