JP7030473B2 - A light source device and a projection type display device having this - Google Patents

Description

The present invention relates to a light source device and a projection type display device having the same, and more particularly to a light source device having a wavelength conversion device and a projection type display device having the same.

In recent years, projection-type display devices that use a solid-state light source and a phosphor have increased the output of the solid-state light source in order to increase the brightness, and convert the wavelength of light from the solid-state light source to another wavelength (fluorescence conversion). The light energy to the phosphor also tends to increase.

Of the light incident on the phosphor, part of the energy of the light that has not been converted to another wavelength is converted to thermal energy, so that the phosphor generates heat, and when the generated phosphor becomes hot, the wavelength conversion efficiency increases. descend.

Therefore, in the projection type display, the phosphor is applied to the outer peripheral portion of the disk-shaped base material (hereinafter referred to as a disk) in an annular shape (hereinafter referred to as a phosphor wheel), and the phosphor is rotated together with the disk. Let me. At the same time, it is conceivable to improve the cooling capacity for the fluorescent substance by blowing cooling air on the disk.

However, the disk is distorted or tilted due to the rotation, and the diameter of the spot formed on the phosphor by the light from the solid light source changes periodically, so that the efficiency of wavelength conversion changes. Therefore, the image finally projected on the projection surface may be distorted.

Patent Document 1 discloses a projection type display device in which a pair or two pairs of air guide paths having the same shape are formed with respect to a phosphor wheel so as to sandwich a disk in a direction parallel to the direction of its rotation axis. is doing. Since this device uniformly applies the pressure of the cooling air to the disk from both sides, it is possible to reduce the distortion and inclination of the disk due to rotation.

Japanese Unexamined Patent Publication No. 2012-181309

However, in the apparatus of Patent Document 1, it is not possible to cool the vicinity of the rotation axis that rotates the phosphor wheel. Therefore, a large temperature difference occurs between the vicinity of the rotating shaft and the portion to be cooled. For this reason, there is a problem that the amount of thermal expansion differs depending on the portion of the phosphor wheel, and the distortion and inclination of the rotation axis and the phosphor wheel cannot be reduced as much as necessary.

Therefore, an object of the present invention is to provide a light source device capable of reducing the distortion and inclination of the phosphor to be smaller than before, and a projection type display device having the same.

In order to achieve the above object, the present invention has a wavelength conversion element for converting the wavelength of light from a light source, a rotating member for rotating the wavelength conversion element, and an accommodating portion for accommodating the wavelength conversion element. The accommodating portion has a shape that circulates the wind generated by the rotation of the wavelength conversion element, and is located between the central portion and the peripheral portion of the wavelength conversion element in a direction parallel to the rotation center axis of the wavelength conversion element. The distance between the inner surfaces of the accommodating portions is larger than the distance between the inner surfaces of the accommodating portions in the central portion of the wavelength conversion element and the inner surface spacing of the accommodating portions in the peripheral portions of the wavelength conversion element .

According to the present invention, it is possible to provide a light source device that reduces distortion and tilt of a phosphor, and a projection type display device having the same.

Explanatory drawing for explaining the whole structure of a projection type display device The figure which shows the structure of the light source apparatus of FIG. Exploded view showing the configuration of the wavelength conversion device of FIG. Perspective view showing the appearance of the wavelength converter The figure which shows an example of the wind direction of the wind generated by a phosphor wheel. Cross-sectional view showing an example of the wind direction of the wind inside the wavelength converter Perspective view showing the appearance of the connecting member of the phosphor wheel. Schematic diagram of a wavelength converter having a fin shape Conceptual diagram of cross section and wind direction of wavelength converter An exploded perspective view of the wavelength converter

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(Example 1)
(overall structure)
FIG. 1 is an explanatory diagram for explaining the overall configuration of the projection type display device P of the present invention.

The light source device 9 includes a light source (individual light source) 91, a wavelength conversion device (fluorescent unit) 100, and a dichroic mirror 97. The detailed configuration of the light source device 9 will be described later. The light from the light source device 9 is incident on the illumination optical system 200.

The illumination optical system 200 causes the light from the light source device 9 to be incident on the color-separated synthetic optical system 500 including a light modulation element (not shown) such as a reflective liquid crystal panel or a digital micromirror device. The light modulation element is driven based on a video signal from a video signal processing unit (not shown), and modulates the light from the incident light source device 9 to generate image light. Since the illumination optical system and the light modulation element are known, detailed description thereof will be omitted.

The image light is incident on the projection lens (projection optical system) 300. The projection lens 300 projects the image light toward the external screen.

Reference numeral 400 is an exterior that includes these components. The projection lens 300 may be detachably attached to the exterior 400 or the like.

(fan)
In this embodiment, a fan (axial flow fan) is provided as a cooling means for the wavelength conversion device 100, the light source 91, and the like. Fans around the wavelength converter 100 are indicated by reference numerals F1, F2, and F3.

The fan F1 and the fan F2 apply the cooling air to the wavelength conversion device 100 (fin shape 8 (see FIG. 8)). The fan F3 discharges the wind including heat from the wavelength conversion device 100. The arrangement of the fans is not limited to this embodiment. Further, it is not necessary to configure all the fans F1, F2, and F3, and for example, the fans F1 and F3 may be configured, or the fans F2 and F3 may be configured. Also, for example, additional fans may be added.

(Configuration of light source device)
FIG. 2 is a block diagram of the light source device 9 according to the first embodiment of the present invention. Hereinafter, a detailed configuration of the light source device 9 will be described with reference to FIG. 2.

The light source device 9 of FIG. 2 includes a light source 91, a collimator lens 92, a mirror array 93 which is an array element composed of a plurality of mirrors, a plane mirror 94, a concave lens 95, a lens array 96, and a dichroic mirror 97. Further, the light source device 9 has a wavelength conversion device 100 (see also FIG. 3) including a condensing optical system 6 and a phosphor 11.

The light source 91 in this embodiment is a blue laser diode. The laser luminous flux emitted from the light source 91 is converted into a parallel luminous flux by the collimator lens 92.

The parallel light beam (laser light beam) from the collimator lens 92 is reflected and focused by the mirror array 93, directed toward the planar mirror 94, and further reflected there and incident on the concave lens 95.

The concave lens 95 emits the incident laser light flux as a parallel light flux toward the lens array 96. The laser luminous flux is incident on the lens array 96, divided into a plurality of pieces, and then directed toward the dichroic mirror 97. The dichroic mirror 97 reflects a plurality of laser light fluxes and emits them toward the condensing optical system 6.

The condensing optical system 6 condenses and superimposes a plurality of laser light beams on the phosphor 11 to form a light spot having a uniform intensity distribution on the phosphor 11. The blue laser luminous flux forming this light spot on the phosphor 11 is converted (wavelength-converted) into fluorescent light having the red spectrum and the green spectrum as the main wavelength regions.

The base material coated with the phosphor 11 (see reference numeral 12 in FIG. 3) is highly reflective aluminum, and the luminous flux of the fluorescent light wavelength-converted by the phosphor 11 is reflected toward the condenser lens 6. .. Some laser light fluxes are not wavelength-converted and are reflected on the highly reflective aluminum surface as blue light fluxes.

These luminous fluxes are condensed by the condensing optical system 6 to become parallel luminous fluxes and head toward the dichroic mirror 97 again.

Here, the surface of the dichroic mirror 97 is coated with a multilayer film. This multilayer film has a property of reflecting or transmitting incident light depending on the wavelength of incident light. That is, it is a reflective film having wavelength selectivity, and has a characteristic that the wavelength of the laser light source (blue light) is reflected and the wavelength converted by the phosphor (red light and green light) is transmitted.

Therefore, among the white light, the red and green light can pass through the dichroic mirror 97. The blue light is partially reflected by the dichroic mirror 97, but can pass outside the dichroic mirror 97. Therefore, the light that can be extracted from the light source optical system is light of the three primary colors of red, green, and blue, and constitutes a white luminous flux. After that, the white light flux goes toward the illumination optical system 200 (see FIG. 1).

(Structure of wavelength converter)
Subsequently, the configuration of the wavelength conversion device 100 according to the first embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 is an exploded view showing the configuration of the wavelength conversion device 100. FIG. 4 is a perspective view showing the appearance of the wavelength conversion device 100.

As shown in FIG. 3, the wavelength conversion device 100 has a phosphor wheel (wavelength conversion element) 1. The phosphor wheel 1 has a configuration in which the phosphor 11 is coated in an annular shape on the radial outer region (outer peripheral portion) of the disk-shaped base material 12.

Further, the wavelength conversion device 100 includes a motor (rotating member) 2, a first cover member 4, a second cover member 5, a condensing optical system 6, and a lens barrel 7.

The phosphor wheel 1 is fixed to the shaft member 20 (see FIG. 4), which is the rotation center axis of the motor 2, via the connecting member 3, so that the phosphor wheel 1 is integrated with the shaft member 20 of the motor 2 (coaxially). Rotate. Reference numeral C indicates a (virtual) central axis of the shaft member 20.

The second cover member 5 includes a motor holding portion 51 for holding the motor 2 (a configuration in which the motor 2 is fixed to the cover member 5 by using a screw 21 around the motor holding portion 51) and a holding for holding the lens barrel 7. The portion 52 is formed. The holding portions 51 and 52 are circular through holes having a predetermined diameter and depth, respectively.

The first cover member 4 and the second cover member 5 are fastened with screws (not shown). The cover members 4 and 5 form a closed space (a closed space or a form having a gap) for accommodating the phosphor wheel 1 and the motor 2. That is, the wavelength conversion device 100 has an accommodating portion for accommodating the phosphor wheel 1 and the motor 2. In other words, the wavelength converter 100 has a case-like shape.

In this embodiment, it is preferable to use a member having good thermal conductivity (for example, aluminum, copper, etc.) for the first cover member 4 and the second cover member 5. This is to make the structure so that the circulating air in the closed space inside the housing is not locally cooled or heated, but if such a structure is possible even when different materials are used, if such a structure is possible. The effect of the present invention can be obtained.

(Optical holding member)
The lens barrel 7 holds the condensing optical system 6 (a lens constituting the lens barrel 7). The lens barrel 7 is made of an aluminum material, and is configured to be fitted with the holding portion 52 via a separate press-fitting member 71. At this time, the distance between the condensing optical system 6 and the phosphor wheel 1 is adjusted.

In this embodiment, a foam is used as the press-fitting member 71, but other materials may be used. Further, in this embodiment, an aluminum material is used for the lens barrel 7, but a resin lens barrel is formed by using a resin material for the lens barrel 7, and the holding portion 52 is directly attached to the holding portion 52 without using a separate press-fitting member. It does not matter if it is press-fitted. Further, the holding of the lens barrel 7 is not limited to the press-fitting configuration, and may be fixed with screws, for example.

(Cooling mechanism)
Next, the cooling method of the phosphor wheel 1 according to the first embodiment and the cooling effect thereof will be described with reference to FIGS. 5 and 6. FIG. 5 is a conceptual diagram illustrating a typical wind direction of the wind generated by the rotation of the phosphor wheel 1 with an arrow. FIG. 6 is a conceptual diagram illustrating a cross section of the wavelength conversion device 100 and a typical wind direction thereof with arrows.

As shown by the arrow 14 of the broken line in FIG. 5, the wind 14 is generated in the tangential direction of the phosphor wheel 1 by the rotation of the phosphor wheel 1 in the rotation direction 13. Due to the flow (convection) of the wind 14, the heat generated by the phosphor 11 is transferred to the first cover member 4 and the second cover member 5 (see FIGS. 3 and 4). As a result, the phosphor wheel 1 is cooled.

The first cover member 4 and the second cover member 5 to which the heat generated by the phosphor 11 is heat-transferred are further described as fans F1, F2, F3 (see FIG. 1) from the outside (from outside the closed space). ). That is, the heat of the first cover member 4 and the second cover member 5 is convected heat transferred to the outside of the exterior 400 (see FIG. 1) by the flow of the cooling air blown to them. ..

(Wind guide shape)
FIG. 6 shows a cross-sectional view of the wavelength conversion device 100.

The first cover member 4 has a curved surface shape (rotationally symmetric) in which the cross-sectional curve 41 of FIG. 6 is rotated around the central axis C of the shaft member 20 of the motor 2 (the central axis C of rotation of the phosphor wheel 1). (See also FIG. 3). This shape is referred to as a first wind guide shape.

Similarly, the second cover member 5 has a curved surface shape (rotationally symmetric) in which the cross-sectional curve 53 of FIG. 6 is rotated around the central axis C of the shaft member 20 of the motor 2. This shape is referred to as a second wind guide shape.

In the wavelength conversion device 100 of the present embodiment, due to these first and second wind guide shapes, as shown by the arrow in FIG. 6, the wind 14 generated by the rotation of the phosphor wheel 1 (dashed line arrow in FIG. 6). It constitutes the wind guide shape of. That is, it constitutes a wind guide shape that forcibly guides the wind 14 to the vicinity of the central axis C (central axis C of the shaft member 20) of the rotation of the phosphor wheel 14 (circulates in a closed space). In FIG. 6, the circulating wind of the wind 14 is indicated by a solid arrow 104.

At the same time, as described above, the first air guide shape of the first cover member 4 and the second air guide shape of the second cover member 5 form the accommodating portion of the phosphor wheel 1 in the wavelength conversion device 100. It will be configured.

The wind guided in the vicinity of the shaft member 20 by the wind guide shape is again guided to the outer peripheral side along the phosphor wheel 1 by the rotation of the phosphor wheel 1. As a result, the circulating air 104 inside the wavelength converter 100 circulates.

As described above, in this embodiment, the temperature distribution in the closed space is controlled by forcibly convection (circulating) the wind 14 generated by the rotation of the phosphor wheel 1 in the closed space (depending on the shape of the wind guide). It can be made almost uniform. That is, the temperature difference between the phosphor wheel 1, the shaft member 20, and the first cover member 4 and the second cover member 5 in the closed space becomes small.

The inside of the closed space is cooled by cooling means outside the closed space (fans F1, F2 and F3 shown in FIG. 1 in this embodiment) as described above while maintaining a substantially uniform temperature distribution.

(First wind guide shape)
Hereinafter, the first air guide shape of the first cover member 4 in this embodiment will be supplemented with reference to FIG.

Although the shape of the first cover member 4 will be described below, this shape may be formed on the side of the second cover member 5. That is, the first air guide shape may be formed on either one of the cover members, or may be formed on both. Of course, the first and second air guide shapes may be combined as in this embodiment, and the air guide shape is not limited to the shape exemplified in this embodiment.

As shown in FIG. 6, a surface (first surface) P1 including a central axis C (see also FIG. 4) of the shaft member 20 which is the center of rotation of the phosphor wheel 1 (base material 12) is defined. Since the shape of the first cover member 4 is a rotationally symmetric shape centered on the central axis C of rotation of the phosphor wheel 1, the surface P1 may be any plane including the central axis C.

Further, a surface (third surface) P3 that is parallel to the surface P1 and is in contact with the outer peripheral portion (disk-shaped edge (side surface) portion) of the phosphor wheel 1 is defined. Further, a surface (second surface) P2 parallel to the surface P1 and the surface P3 and arranged between them is defined. In this embodiment, the surface P2 is defined between the surface P1 and the surface P3, but even if the surface P2 is defined at a position where the distance between the surface P2 and the surface P1 is not equal to the distance between the surface P2 and the surface P3. The effect of the invention can be obtained.

Further, on the above surfaces P1, P2, and P3, the distances between the phosphor wheel 1 and the surface of the first cover member 4 facing the phosphor wheel 1 are W1, W2, and W3, respectively, as shown in FIG. And.

In this embodiment, the shape of the first cover member 4 (of which the surface facing the phosphor wheel 1) is configured such that the interval W2 is wider than the interval W1 and W3. That is, the shape satisfies W2> W1 and W2> W3.

Further, in this embodiment, the shape of the first cover member 4 is configured so that the interval W3 is wider than the interval W1. That is, the shape satisfies the relationship of W3> W1.

As a result, in this embodiment, the wind (cooling air) inside the wavelength converter 100 is circulated more effectively. In this embodiment, the shape that satisfies the relationship of W2> W1 and W2> W3 and further satisfies the relationship of W3> W1 is shown, but the shape satisfies either the former relationship or the latter relationship. Even if there is, the effect of the present invention can be obtained.

Further, at least a part of each surface P1, P2, and P3 is formed by a smooth curved surface. From another viewpoint, the cross-sectional shape (cross-sectional curve (cross-sectional shape) 41 shown in FIG. 6) on the surface including the axis of the center of rotation of the phosphor wheel 1 (base material 12) having the first airflow shape is the phosphor wheel. It has a smooth curve from the outer circumference of 1 (the radial outer side of the central axis C) toward the central axis C. Thereby, the resistance to the circulating wind 104 can be further reduced. Although it is desirable to configure it in this way, the effect of the present invention can be obtained even if the shape includes irregularities that are not smooth in part.

(Second wind guide shape)
Next, the second air guide shape of the second cover member 5 in this embodiment will be supplemented with reference to FIG.

Of the surfaces of the phosphor wheel 1 shown by the alternate long and short dash line in FIG. 6, the surface S (fourth surface S) facing the second cover member 5 is defined. The surface S may be a surface orthogonal to the central axis C and including the phosphor wheel 1. At this time, the second air guide shape is such that the distance between the second cover member 5 and the surface S becomes smaller (narrower) toward the outer side in the radial direction from the central axis C. Further, similarly to the first air guide shape, the second air guide shape has a smooth curved surface on the side of the central axis C and the outer periphery of the phosphor wheel 1 (outward in the radial direction of the central axis C).

In other words, the central axis C of the second cover member 5 is closer to the first cover member 4 (the other cover member) that forms a closed space with itself as it goes outward in the radial direction from the central axis C. It has a curved surface formed so as to approach in the extending direction of.

On the surface of the second cover member 5 on the phosphor wheel 1 side, a lens 61 arranged on the phosphor wheel 1 side of the condensing optical system 6 (see FIG. 3) and a lens 61 thereof are held. The lens barrel 7 is arranged. It is preferable that the second air guide shape described above and the surface of the lens 61 are adjusted so as to be substantially the same (height) surface within an error range.

Similarly, it is preferable that the surface of the lens barrel 7 holding the lens 61 is also configured to be a surface having substantially the same (height) as the surface of the second wind guide shape. Further, it is desirable that the second wind guide shape is a smooth curved surface shape including the surface of the lens 61 in a state where the condensing optical system 6 is adjusted to a normal position. In other words, it is preferable that the lens 61 and the lens barrel 7 are configured so as not to protrude or dent with respect to the second wind guide shape.

(effect)
With the above configuration, the cooling air (wind 14 and circulating air 104) circulates, so that the temperature distribution of air (temperature) in the closed space composed of the first cover member 4 and the second cover member 5 It approaches (reduces) an equilibrium state in which the height difference) becomes uniform. Along with this, the temperature difference between the outer circumference and the inner circumference of the phosphor wheel 1 housed in this closed space can also be reduced. Therefore, it is possible to reduce the occurrence of distortion and inclination due to the temperature difference of the phosphor wheel 1.

In addition, cooling means such as a fan outside the closed space enables cooling while keeping the temperature distribution in the closed space uniform.

Further, in this embodiment, since the phosphor is housed in a closed space, dust and the like are collected on the phosphor by light energy, and the problem of so-called contamination such as a decrease in the efficiency of fluorescence conversion is prevented, and fluorescence is performed. It is possible to reduce the occurrence of distortion and tilt of the body wheel 1.

(Modification example)
Further, the connecting member 3 shown in FIG. 7 sandwiches the phosphor wheel 1 together with the motor 2, but has an uneven shape (heat receiving portion) 31 on the surface opposite to the contact surface with the phosphor wheel 1. There is. By increasing the surface area of the connecting member 3 by the concave-convex shape 31, the shape is such that heat can be easily conducted from the wind circulating in the closed space to the phosphor wheel 1. It should be noted that the concave-convex shape may be directly provided on the phosphor wheel 1.

Further, FIG. 8 shows a schematic view of the wavelength conversion device 100 having a fin shape. As described above, the outer surface shape of the case (housing) composed of the first cover member 4 and the second cover member 5 preferably includes a fin shape 8 having a high heat transfer coefficient. In particular, as shown in FIG. 8, the fin shape 8 is preferably provided on the side of the first cover member 4 having the first air guide shape. Further, there may be a form in which a fin shape is provided on the second cover member 5 side as well.

With this configuration, the overall temperature in the closed space can be lowered by the action of the fans F1, F2, F3, etc. (see FIG. 1), and the cooling efficiency of the phosphor wheel 1 can be improved. ..

Further, although the fan is exemplified as the cooling means, the present invention can be implemented by a cooling means other than the fan. For example, the present invention can also be carried out by a so-called water-cooled cooling means in which a phosphor wheel or a light source is housed in a closed space and a liquid is applied from the surroundings to conduct convection heat conduction.

Further, in this embodiment, the configuration of a projection type display device in which the cooling means is arranged outside the light source device 9 is illustrated. However, the present invention can be implemented even if the light source device has a cooling means. For example, a fan may be provided as a cooling means inside the light source device. In other words, the present invention can be carried out as long as the cooling means is configured to act from the outside on the accommodating portion (closed space) having a wind guide shape inside.

In this embodiment, the motor 2, the condensing optical system 6 (lens 61), and the lens barrel 7 together with the first cover member 4 and the second cover member 5 also form a closed space having a wind guide shape. The configuration of the air guide shape (closed space) is not limited to the configuration of these members, and other members may be added to form the air guide shape, for example, the first cover member 4 and the second cover member 5. It does not matter if it is composed of only.

Further, in this embodiment, a configuration in which the phosphor wheel 1 and the motor 2 (the portion of the shaft member 20) are housed inside the closed space (air guide shape) formed by the cover member is illustrated. As described above, the phosphor wheel including the shaft member connected to the power source of the motor or the like (the portion of the shaft member 20 exposed from the exterior of the motor in this embodiment) is not exposed from the closed space. preferable. If the rotating shaft member is locally distorted, the rotation of the phosphor wheel will be shaken. However, with this configuration, distortion and tilt due to the difference in relative thermal expansion between the phosphor wheel and the rotating shaft member can be prevented. It can be suppressed.

For example, the effect of the present invention can be obtained even if the portion other than the shaft member of the motor is arranged (exposed) outside the cover member (in this case, the portion other than the shaft member of the motor becomes the boundary of the closed space and the shaft. In other words, the member itself is inside a closed space). Further, for example, the present invention can be implemented even if the condensing optical system, the light source, or the like is housed inside a closed space (air guide shape).

(Example 2)
Hereinafter, the configuration and effect of the wavelength conversion device according to the second embodiment of the present invention will be described with reference to FIGS. 9 and 10. The same reference numerals are given to the same configurations as those of the first embodiment, and the description thereof will be omitted.

FIG. 9 is a cross-sectional view of the wavelength converter 100 and a conceptual diagram of the wind direction. FIG. 10 is an exploded perspective view of the wavelength conversion device 100. The first cover member 4 and the second cover member 5 of this embodiment differ from the configuration of the first embodiment in that the convection guiding member 10 is sandwiched between them.

(Cooling mechanism)
In the second embodiment as well, the wind 14 in the tangential direction of the phosphor wheel 1 is generated as in the first embodiment (see also the broken line arrow in FIG. 8 and FIG. 5). Due to the flow (convection) of the wind 14, the heat generated by the phosphor 11 is transferred to the first cover member 4 and the second cover member 5 (see FIGS. 3 and 4). As a result, the phosphor wheel 1 is cooled.

The first cover member 4 and the second cover member 5 have a cross-sectional curve 41 and a cross-sectional curve 53 as shown in the cross-sectional view of FIG. 9, and these cross-sectional curves are centered on the shaft member 20 of the motor 2. It has a rotationally symmetric shape that revolves around the axis C.

Therefore, similarly to the first embodiment, the wind 14 is forcibly guided to the vicinity of the shaft member 20 (divided into the circulating wind 104 indicated by the solid arrow in FIG. 9 and the circulating wind 140 indicated by the black arrow in FIG. 9). The wind guided in the vicinity of the shaft member 20 is again guided to the outer peripheral side of the phosphor wheel 1 by the rotational drive of the phosphor wheel 1 and circulates.

(Induction member)
The convection guiding member 10 has a rotationally symmetric curved surface shape (guide shape) in which a cross-sectional curve 101 as shown in the cross-sectional view of FIG. 9 is rotated around the center of the central axis C. The circulation wind 140 has a shape formed by rotating the cross-sectional curve 101 around the central axis C and a shape formed by rotating the cross-sectional curve 41 of the first cover member 4 around the central axis C. The wind guide shape is formed. From another point of view, the convection guiding member 10 and the first cover member 4 form a wind flow path.

In this embodiment, the convection guiding member 10 having the guiding shape is configured, but other members may have the guiding shape. For example, it may be integrally configured with the first cover member.

(effect)
The circulating air 140 is guided to the vicinity of the shaft member 20 through this air guide shape. The circulating wind 140 guided to the vicinity of the shaft member 20 passes between the phosphor wheel 1 and the convection guiding member 10 from the vicinity of the shaft member 20 and is guided to the outer peripheral side thereof (circulating wind 240, hatched in FIG. 9). Arrow).

That is, the convection guiding member 10 can separate and rectify the flow of the circulating air 140 and the circulating air 240 to clarify the flow path of the circulation. In other words, the convection guiding member 10 separates the vicinity of the rotating phosphor wheel 1 from the wind guide-shaped portion of the first cover member 4. From another viewpoint, a flow guided from the outer periphery of the phosphor wheel 1 to the vicinity of the shaft member 20 (flow of the circulating air 140) and a flow guided from the shaft member 20 to the outer peripheral side of the phosphor wheel 1 (circulating wind 240). (Flow) is mixed, and it is prevented that a part of the flow is prevented from staying.

With the above configuration, the circulation efficiency of the cooling air (wind 14, circulating air 104, 140, 240) can be improved. That is, the temperature difference between the outer circumference and the inner circumference of the phosphor wheel 1 itself can be further reduced, and the occurrence of distortion due to the temperature difference can be suppressed.

(Modification example)
The cross-sectional curves 41 and 101 in the cross-sectional view including the central axis C of the shaft member 20 of the motor 2 and the phosphor wheel (base material 12) are the flow paths of the flowing wind like the circulating wind 140 as shown in FIG. The width is almost constant. In other words, the cross-section curves 41 and 101 are substantially concentric curves having substantially the same (virtual) center.

However, the shape of the cross-sectional curve of the wind guide shape in the cross section including the central axis of rotation of the phosphor wheel of the wind guide shape is not limited to this. For example, the width of the air guide may be reduced as the circulating wind is directed toward the central axis of the phosphor wheel, and vice versa. Further, it is desirable that the cross-sectional curve is formed smoothly.

Further, in this embodiment, the flow path is provided on the side of the first cover member 4 according to the guide shape, but the guide shape may be provided on the side of the second cover member 5 or on both sides.

Further, in this embodiment, the first cover member 4, the second cover member 5, or the central axis C, which has a rotationally symmetric air guide shape around the central axis C of rotation of the motor 2 and the phosphor wheel 1, rotates around the central axis C. The convection guiding member 10 having a symmetrical guiding shape was formed. It is preferable to configure in this way, however, as long as they have at least a part of the cross-sectional shape as shown in FIG. 6 or 9 (there may be a cross-sectional shape that does not include the central axis C). , Even if it is not rotationally symmetric, a certain effect can be enjoyed.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

1 Phosphor wheel 2 Motor 9 Light source device 41 Cross-section curve 53 Cross-section curve 91 Light source 100 Wavelength converter

Claims (13)

It has a wavelength conversion element that converts the wavelength of light from a light source, a rotating member that rotates the wavelength conversion element, and an accommodating portion that accommodates the wavelength conversion element.
The accommodating portion has a shape that circulates the wind generated by the rotation of the wavelength conversion element.
In the direction parallel to the rotation center axis of the wavelength conversion element, the distance between the inner surfaces of the accommodation portion in the middle between the central portion and the peripheral portion of the wavelength conversion element is the inner surface of the accommodation portion in the central portion of the wavelength conversion element. A light source device characterized in that the distance between the two is larger than the distance between the inner surfaces of the accommodating portion in the peripheral portion of the wavelength conversion element . The light source device according to claim 1, wherein the shape of the accommodating portion for circulating wind is rotationally symmetric with respect to the rotation center axis of the wavelength conversion element. The shape for circulating the wind in the accommodating portion is characterized by a curved surface shape in which the side of the rotation center axis of the wavelength conversion element and the side of the peripheral portion of the wavelength conversion element are smoothly connected. The light source device according to claim 1 or 2. One of claims 1 to 3 , wherein the distance between the inner surfaces of the accommodating portions in the peripheral portion of the wavelength conversion element is larger than the distance between the inner surfaces of the accommodating portions in the central portion of the wavelength conversion element. The light source device described in. The light source device according to any one of claims 1 to 4 , wherein the wavelength conversion element is provided with a concave-convex shape. It has a connecting member for connecting the wavelength conversion element and the rotating member, and has a connecting member.
The light source device according to claim 5 , wherein the connecting member has an uneven shape. The accommodating portion has a first cover member and a second cover member.
Between at least one of the first cover member and the second cover member and the wavelength conversion element,
The first to sixth aspects of claim 1 to 6 , further comprising an guiding member that guides the wind generated by the rotation of the wavelength conversion element toward the rotation center axis of the wavelength conversion element by separating it from the wavelength conversion element. The light source device according to any one item. The light source device according to claim 7 , wherein the guiding member has a shape rotationally symmetric with respect to the rotation center axis of the rotating member. The light source device according to any one of claims 1 to 8 , wherein the rotating member or the shaft member of the wavelength conversion element is arranged inside the accommodating portion. The light source device according to any one of claims 1 to 9 , further comprising a cooling means for cooling the accommodating portion from the outside of the accommodating portion. The light source device according to any one of claims 1 to 10 , wherein the wavelength conversion element is provided with a phosphor on a base material having a disk shape. The light source device according to any one of claims 1 to 11 , an illumination optical system that illuminates a light modulation element with light from the light source device, and a projection optical system that projects light from the light modulation element. Projection type display device. The projection type display device according to claim 12 , further comprising a cooling means for cooling the light source device.

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