JP2018128614A - Light source device, projection type display device equipped with the same, and projection type display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device capable of suppressing a fluctuation of a distance between a condensing optical system that guides light from a light source to a rotary member and the rotary member more than a conventional one, and also to provide a projection type display device equipped therewith and a projection type display system.SOLUTION: A light source device includes: a first holding member; a second holding member; a rotary member held by the first and second holding members so as to allow rotation around a rotation axis; and a diffusion member disposed on the rotary member. The rotary member is pressed in a direction of the rotation axis by the first and second holding members.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light source device, a projection display device including the light source device, and a projection display system.

  In recent years, as a light source device for a projection display device, a solid-state light source such as a laser diode (hereinafter referred to as LD) that emits blue light, and a phosphor wheel that is coated with a phosphor that emits fluorescent light using light from the LD as excitation light. A light source device described in Patent Document 1 is known.

  In the light source device described in Patent Literature 1, the phosphor wheel is bonded to the wheel support surface in the vicinity of the rotation axis, and an adhesive is provided as a balance member at a position away from the rotation axis of the phosphor wheel. It is possible to rotate the body wheel stably.

Japanese Patent Laying-Open No. 2015-7751

  Here, when the distorted (deflected) phosphor wheel is rotated, the distance between the condensing optical system for condensing the light from the LD onto the phosphor wheel and the phosphor wheel. Changes (causes surface blurring). As a result, the distance between the condensing optical system and the phosphor wheel changes, and the condensing spot on the phosphor wheel becomes large, and the use efficiency in the subsequent illumination optical system decreases, There is a risk of periodic brightness fluctuations such as flicker.

  Since the light source device described in Patent Document 1 has only the vicinity of the rotation axis of the phosphor wheel bonded to the wheel support surface, the phenomenon when the above-described distorted phosphor wheel rotates is sufficient. Can not be suppressed.

  Accordingly, the present invention provides a light source device capable of suppressing fluctuations in the distance between the condensing optical system that guides light from the light source to the rotating member and the rotating member, and a projection display device including the same. An object is to provide a projection display system.

In order to achieve the above object, the light source device of the present invention comprises:
A first holding member;
A second holding member;
A rotating member held by the first and second holding members so as to be rotatable about a rotation axis;
A diffusion member provided on the rotating member,
The rotating member is pressed in the direction of the rotating shaft by the first and second holding members,
It is characterized by that.

  According to the present invention, a light source device capable of suppressing a variation in the distance between a condensing optical system for guiding light from a light source to a rotating member and the rotating member, and a projection display device including the light source device. A projection display system can be provided.

The perspective view explaining the structure of the light source device of this invention Cross-sectional view of the phosphor wheel holding configuration in Example 1 Cross-sectional view of the phosphor wheel holding configuration in a more preferred form of Example 1 Cross-sectional view of the phosphor wheel holding configuration in a more preferred form of Example 1 Cross-sectional view of the phosphor wheel holding configuration in Example 2 Phosphor wheel holding configuration in Example 2 Cross-sectional view of the phosphor wheel holding configuration in a more preferred form of Example 2 Configuration explanatory diagram of a projection display device Diagram explaining wheel warpage Cross section of phosphor wheel holding configuration of modification Configuration diagram of the projection display system

Example 1
(Overall configuration of projection display device)
First, the overall configuration of a projection type display device capable of mounting the light source device described in each embodiment of the present invention will be described with reference to FIG. DESCRIPTION OF SYMBOLS 1 is the light source device demonstrated by each Example of this invention, 2 is the illumination which adds image information to the light from the light source device 1, and a color separation synthetic | combination optical system (light guide optical system), 3 is the projection projected on an external screen A lens (projection optical system) 4 is an exterior case (housing) including these configurations. The projection lens 3 can be attached to and detached from the exterior case 4.

  The illumination and color separation / synthesis optical system 2 includes first and second fly-eye lenses, a condenser lens, and a polarization conversion element for uniformizing light from the light source device 1 and illuminating a liquid crystal panel (light modulation element). ing. Further, the illumination and color separation / combination optical system 2 includes a dichroic mirror for dividing the light from the condenser lens described above for each wavelength, first, second, and third liquid crystal panels that receive red, green, and blue color lights, A prism for guiding light to the liquid crystal panel is provided.

(Configuration of light source device)
Next, a configuration of the light source device 1 as the first embodiment and a more preferable form of the first embodiment will be described with reference to FIGS. 1 to 4.

  1 is a perspective view of the light source device 1, and FIG. 2 is a cross-sectional view showing a schematic configuration of the light source device 1 of FIG. In FIG. 1, 11 is a light source, 12 is a dichroic mirror that reflects light emitted from the light source 11 and transmits wavelength-converted light described later, and 13 is a condensing optical system. Reference numeral 14 denotes a phosphor wheel (wavelength conversion member) in which a phosphor layer 14b (diffusion member) is coated in an annular shape on a disk 14a (rotating member). Reference numeral 15 denotes a wheel holding member 15a (second holding member) that comes into contact with the phosphor wheel 14, and a motor for rotationally driving the phosphor wheel 14. Reference numeral 16 denotes a sandwiching member (first holding member) disposed in contact with the surface of the disk 14a on which the phosphor layer 14b is applied.

  The light source 11 includes, for example, a plurality of semiconductor laser diodes or LEDs that emit laser light, and the light emitted from the light source 11 is condensed on the phosphor layer 14 b by the condensing optical system 13. The phosphor wheel 14 is generally composed of a disk 14a (for example, aluminum, copper, etc.) having a high thermal conductivity, and the outer diameter is generally punched out by pressing. The phosphor wheel 14 is connected to a wheel holding member 15a which is a part of a motor 15 having the same center. A sandwiching member 16 is disposed on the opposite side of the phosphor wheel 14 from the side where the motor 15 is disposed, and the phosphor wheel 14 is sandwiched between the wheel holding member 15 a and the sandwiching member 16. Take.

  In other words, the disk 14a is held by the holding member 16 and the wheel holding member 15a so as to be rotatable about the rotation axis. The disk 14a is pressed in the direction of the rotation axis of the disk 14a by the wheel holding member 15a and the pinching member 16. And the pinching member 16 is provided in the 1st side which is the side in which the fluorescent substance layer 14b of the disc 14a is provided, and the wheel holding member 15a is opposite to the 1st side of the disc 14a. It is provided on the second side.

  That is, the holding member 16 presses the phosphor wheel 14 in the direction of the rotation axis of the motor 15. Specifically, the phosphor wheel 14 and the pinching member 16 are screwed to screw holes provided in the wheel holding member 15a by screws. Alternatively, a configuration may be employed in which a male screw portion is provided at the center portion of the wheel holding member 15a, a screw hole is provided in the center member of the holding member 16, and the three components are held by screwing the holding member 16 (not shown). ). Furthermore, you may employ | adopt the press structure which has a spring shape.

(Effects obtained by this embodiment)
With such a configuration, even when the warp as shown in FIG. 9 occurs in the manufacturing process of the phosphor wheel 14, the phosphor wheel 14 is corrected by the wheel holding member 15a and the holding member 16. And the flatness of the coated surface of the phosphor 14b can be improved. As a result, the distance between the condensing optical system 13 and the phosphor layer 14b when the motor 15 rotates can be made substantially constant, and the wavelength conversion efficiency in the phosphor layer 14b can be made substantially uniform. It is possible to suppress the occurrence of flicker. As described later, the cause of the warp as shown in FIG. 9 includes storing the sheet metal on which the disk 14a is based in a roll shape, distortion during pressing, and the like.

  In other words, by adopting the configuration of the present embodiment, a light source device capable of suppressing the variation in the distance between the condensing optical system that guides the light from the light source to the rotating member and the rotating member is realized. can do.

  It is known that phosphors not only have a low wavelength conversion efficiency but also deteriorate a binder (resin material) at a high temperature, and therefore it is necessary to dissipate heat applied by light irradiation. Therefore, in this embodiment, the disk 14a coated with the phosphor 14b is fixed to the motor 15 with the center of the disk 14a being the same as the center of rotation, and the disk 14b is always rotated during the laser light irradiation. As a result, the region irradiated with the laser light always moves on the disk 14a, and the phosphor layer 14b is prevented from becoming locally hot.

  On the other hand, by rotating the disk 14a, vibration may occur due to the imbalance in the weight balance of the disk 14a coated with the phosphor 14b. In this embodiment, the above-described configuration is adopted. The influence of the vibration can be suppressed. Furthermore, it is possible to suppress the influence caused by the face shake of the disk 14a.

  In the prior art disclosed in Patent Document 1 described above, even if vibrations can be reduced, positional variation with the condensing optical system is not considered, and the configuration depends on the flatness of the wheel itself. It has been. In general, from the viewpoint of heat dissipation, a metal plate such as aluminum is often used for the wheel, and a wheel having a large wheel diameter (for example, φ100 mm) is increasingly used to improve heat dissipation performance. For this reason, there is a concern that the flatness of the wheel itself further deteriorates, causing flicker.

  Further, when distortion occurs in a wheel manufacturing process such as a press, the adhesive fixing described in Patent Document 1 is not an attachment that improves the flatness, and there is a concern about the occurrence of flicker described above. On the other hand, as shown in FIG. 9, in the configuration C (screw fixing) in which the screw head (screw is represented by an arrow) is pressed and fixed in the direction of the rotation axis, the screw is fixed by a minimum area of the screw head only, and the wheel is sufficiently There is a problem that correction along the holding part D cannot be performed. Further, with respect to the wheel distortion that approaches the motor side (B area in FIG. 10), the distortion of the wheel that moves away from the motor side can be corrected by the mounting portion D on the motor side to be somewhat flat. (Region A in FIG. 10) cannot be corrected. It is not possible to correct the external shape beyond the screw fixing part.

  On the other hand, by adopting the configuration of the present embodiment, it is possible to suppress the distortion of the disk 14a in the A and B regions shown in FIG. As a result, as described above, it is possible to realize a light source device that can suppress fluctuations in the distance between the condensing optical system that guides light from the light source to the rotating member and the rotating member as described above.

(More preferred form)
The wheel holding member 15a and the pinching member 16 are generally shaped by cutting such as lathe processing, so that the flatness is improved. Further, by adopting the holding structure of this embodiment, the phosphor wheel 14 Can be as flat as cutting.

  In this embodiment, it is the phosphor layer 14b side (X in FIG. 3) that dominates the planarity of the phosphor wheel 14 that is sandwiched. Therefore, it is desirable to correct the holding structure to a plane as close as possible to the phosphor layer 14b. Therefore, it is desirable to correct by providing a pressing structure on the outer side of the holding member 16.

  For example, there is a screw fixing shown by an arrow in FIG. Specifically, screw holes are provided in the wheel holding member 15a, and holes are provided in the phosphor wheel 14 and the holding member 16 at positions corresponding to the screw holes, so that the screw head can be firmly corrected. Furthermore, in the holding portion, the holding member 16 and the wheel holding member 15a are required to have high rigidity. For this reason, as shown in FIG. 3 or FIG. 4, for example, ribs (15a1 and 161) are changed in cross-sectional shape to increase the rigidity at the holding portion, thereby further improving the planarity of the phosphor wheel 14. Improvement is possible.

  In other words, the thickness of the holding member 16 at the first position in the direction orthogonal to the direction of the rotation axis is larger than the thickness of the holding member 16 at the second position closer to the rotation axis than the first position. Thickness is preferred. Further, the thickness of the wheel holding member 15a at the third position in the direction orthogonal to the direction of the rotation axis is thicker than the thickness of the wheel holding member 15a at the fourth position closer to the rotation axis than the third position. It is preferable.

  At this time, since the rib 161 is close to the light beam transmitted through the condenser lens 13, a chamfered shape is preferably added to the outside of the rib 161 (not shown in FIGS. 3 and 4; described in FIG. 5). Furthermore, by applying a weight for correcting the unbalance of the wheel along the rib, it is possible to prevent the weight from being peeled off due to the centrifugal force caused by the wheel rotation. In other words, the end of the holding member 16 preferably has a slope or a curved surface.

  In the present embodiment, the configuration in which the wheel holding member 15a is part of the motor 15 has been described. However, as shown in FIG. 4, the wheel holding member 15b independent of the motor is used as the second holding member. But it ’s okay.

  Furthermore, it is preferable that the wheel holding member 15a (or the wheel holding member 15b) and the holding member 16 are made of a material having high thermal conductivity such as aluminum or copper. By comprising in this way, the heat capacity of the rotary body including the phosphor wheel 14, the holding member 16, and the wheel holding member 15a or 15b can be increased. As a result, it is possible to reduce the temperature rise due to the heat generated in the phosphor layer 14b, and to increase the light emission efficiency in the phosphor layer 14b.

(Example 2)
Next, a configuration of the light source device 1 as the second embodiment and a more preferable form of the second embodiment will be described with reference to FIGS.

  In the above-described first embodiment, the configuration has been described in which the holding member 16 that holds the phosphor wheel 14 and the wheel holding portion 15b are in contact with the circular plate 14a as a whole with both parts. However, it is difficult to guarantee flatness over a wide area in terms of part processing. Therefore, in this embodiment, as shown in FIG. 5, the disc 14 a is sandwiched by the protrusions (162 and 15 b 2) Y provided on the outer sides of the wheel holding portion 15 b and the sandwiching member 16.

  In other words, the holding member 16 has a first protrusion 162 that can contact a region between the phosphor layer 14b and the rotation axis of the disk 14a, and a rotation axis that is more than the first protrusion 162. And a first extending portion provided so that a gap is formed between the disc 14a on the side. The first extending portion referred to here is a portion of the holding member 16 that is closer to the rotating shaft than the first projecting portion 162. Similarly, the wheel holding member 15b has a second protrusion 15b2 that can come into contact with a region between the phosphor layer 14b and the rotation shaft of the disc 14a. Furthermore, the wheel holding member 15b has a second extending portion that is provided so that a gap is formed between the second projecting portion 15b2 and the disc 14a on the rotating shaft side.

(Effects obtained by this embodiment)
By adopting the configuration shown in FIG. 5, even if the processing accuracy is not so high as to have a high flatness on a wide surface, the condensing optical system that guides the light from the light source to the rotating member as compared with the conventional one, and the rotating member. It is possible to realize a light source device capable of suppressing fluctuations in the distance.

(More preferred form)
However, when the configuration shown in FIG. 5 is adopted, an air gap G is generated between the phosphor wheel 14, the wheel holding member 15 b, and the holding member 16. For this reason, there is a concern that the air gap G generates a heat insulating action and causes the temperature of the phosphor layer 14b to rise.

  Therefore, as shown in FIG. 6 and FIG. 7, radial slits (15S and 16S) are provided on the protrusions for holding provided on the outer periphery of the wheel holding member 15b and the holding member 16 with reference to the rotation center. It is more preferable to provide a plurality. Further, a configuration in which holes (15H and 16H) are provided on the inner diameter side of the slit is more preferable. In other words, the holding member 16 is provided with a plurality of slit portions and a plurality of hole portions that extend radially about the rotation axis. Similarly, the wheel holding member 15b is provided with a plurality of slit portions and a plurality of hole portions that extend radially around the rotation axis. 7 is a cross-sectional view showing a ZZ cross section in FIG.

  By doing so, as shown in FIG. 7, the rotating body including the phosphor wheel 14, the sandwiching member 16, and the wheel holding member 15 b rotates, so that both planar portions of the phosphor wheel 14 become negative pressure. As a result, a flow attracted to the phosphor wheel 14 in the rotation axis direction is generated. The flow is sucked from the air holes (15H), flows through the flat portion of the phosphor wheel 14, and is further discharged through the slit (15S) in the radial direction by centrifugal force (W1 in FIG. 7). Here, the flow W1 passing through the hole 15H provided in the wheel holding member 15b has been described, but the flow W2 passing through the hole 16H provided in the clamping member 16 also performs the same movement.

  Therefore, since a flow of air around the phosphor wheel 14 is formed, the phosphor layer 14b can be cooled, improving the flatness of the phosphor wheel 14 and increasing the temperature of the phosphor layer. Can be suppressed.

  That is, by adopting the configuration shown in FIG. 6 and FIG. 7, it is possible to suppress the variation in the distance between the condensing optical system that guides the light from the light source to the rotating member and the rotating member. In addition, a light source device capable of cooling the rotating member can be realized.

(Modification)
As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

  A configuration of a specific modification will be described with reference to FIG. FIG. 10 shows a modification of the light source device 1 described as the first embodiment. The difference between this modification and the first embodiment is that the holding member 160 is used instead of the holding member 16 as the first holding member. It is a point to use.

  When the sheet metal that is the basis of the disk 14a is originally stored in a roll shape, and the inner surface of the roll sheet metal is used as a surface on which the phosphor layer 14b is provided, the disk 14a has a rotational axis. It is conceivable that both the left and right sides will bend in the direction approaching the condensing optical system. Alternatively, it is conceivable that the disk 14a bends due to distortion during press working.

  In other words, it is conceivable that the right side deflection with respect to the rotation axis shown in FIG. 9 is the same as the left side deflection. Therefore, in this embodiment, the length R2 from the rotation axis RA to the end of the holding member 160 in the direction orthogonal to the rotation axis RA is from the rotation axis RA to the wheel holding member in the direction orthogonal to the rotation axis RA. It was made to become longer than length R3 to the edge part of 15a.

  By setting the length R2 to the end of the holding member 160 as described above, it is possible to prevent the above-described disk 14a from being bent in the direction approaching the condensing optical system on the left and right with respect to the rotation axis. be able to. As a result, it is possible to realize a light source device that can suppress fluctuations in the distance between the condensing optical system that guides light from the light source to the rotating member and the rotating member as compared with the conventional art.

When the length from the rotation axis RA to the end of the disk 14a in the direction orthogonal to the rotation axis RA is R1, the light source device 1
0.3 ≦ R2 / R1 ≦ 0.8 (1)
Is preferable,
0.4 ≦ R2 / R1 ≦ 0.7 (1a)
Or
0.43 ≦ R2 / R1 ≦ 0.68 (1b)
Is more preferable. When deviating from the lower limit value of the above formula (1) or (1a), (1b), the holding member 160 is too short so that the above-described disk 14a approaches the condensing optical system on both the left and right sides with respect to the rotation axis. Since it cannot fully suppress that it bends, it is unpreferable. On the other hand, if it deviates from the upper limit of the above formula (1) or (1a), (1b), the holding member 160 is too long and the holding member 160 blocks part of the light incident on the phosphor layer 14b. This is not preferable because there is a risk of being lost.

Furthermore, the light source device 1 is
1.1 ≦ R2 / R3 ≦ 2.5 (2)
Is preferable,
1.15 ≦ R2 / R3 ≦ 2.20 (2a)
Or
1.2 ≦ R2 / R3 ≦ 2.0 (2b)
Is more preferable. Deviating from the lower limit of the above formula (2) or (2a), (2b) is not preferable because the wheel holding member 15a is too long and the back surface of the disk 14a may not be sufficiently cooled. On the other hand, it is preferable to deviate from the upper limit of the above formula (2) or (2a) or (2b) because the wheel holding member 15a is too short and the phosphor wheel 14 may not be stably rotated. Absent. Alternatively, it is not preferable because the holding member 160 is too long and the holding member 160 may block part of the light incident on the phosphor layer 14b.

  Each of the embodiments described above can be applied to the projection display system shown in FIG. 11 in addition to the projection display apparatus shown in FIG. In the projection display system shown in FIG. 11, S is a screen as a projection surface, PJ1 to PJ3 are projectors, and C is a control device for controlling each projector. You may apply the light source device as described in each above-mentioned Example to all or any of PJ1-PJ3. Note that although there are a plurality of projectors in the projection display system shown in FIG. 11, there may be one projector.

  Further, in each of the above-described embodiments, the configuration of the light source device 1 using the phosphor layer 14b as the diffusing member has been exemplified. However, instead of the phosphor layer 14b, the diffusing layer is provided on the disc 14a as the diffusing member. It may be. In this configuration, the light source 11 may include a light source for red light and a light source for green light in addition to the light source for blue light.

DESCRIPTION OF SYMBOLS 11 Light source 12 Mirror 13 Condensing optical system 14 Phosphor wheel 14a Disk (rotating member)
14b Phosphor layer (diffusion member)
15 Motor 15a, 15b Wheel holding member (second holding member)
16 Nipping member (first holding member)

Claims (17)

A first holding member;
A second holding member;
A rotating member held by the first and second holding members so as to be rotatable about a rotation axis;
A diffusion member provided on the rotating member,
The rotating member is pressed in the direction of the rotating shaft by the first and second holding members,
A light source device characterized by that. The first holding member is provided on a first side which is a side where the diffusion member of the rotating member is provided,
The second holding member is provided on a second side that is opposite to the first side of the rotating member.
The light source device according to claim 1. The first and second holding members are provided in a region between the diffusion member and the rotation shaft.
The light source device according to claim 1, wherein: The thickness of the first holding member at the first position in the direction orthogonal to the direction of the rotation axis is such that the first holding member at the second position closer to the rotation axis than the first position. Thicker than the thickness of
The light source device according to claim 1, wherein the light source device is a light source device. An end portion of the first holding member has a slope or a curved surface;
The light source device according to claim 1, wherein the light source device is a light source device. The thickness of the second holding member at a third position in a direction orthogonal to the direction of the rotation axis is such that the second holding member at a fourth position closer to the rotation axis than the third position. Thicker than the thickness of
The light source device according to claim 1, wherein the light source device is a light source device. The first holding member may be in contact with a region of the rotating member between the diffusion member and the rotating shaft, and the rotating shaft side of the first protruding member. A first extending portion provided so as to generate a gap between the rotating member and
The light source device according to claim 1, wherein the light source device is a light source device. The second holding member has a second protrusion that can contact a region between the diffusion member and the rotation shaft in the rotation member, and the rotation shaft side of the second protrusion. A second extending portion provided so as to generate a gap between the rotating member and
The light source device according to claim 1, wherein the light source device is a light source device. The first holding member is provided with a plurality of slit portions and a plurality of hole portions extending radially about the rotation axis.
The light source device according to claim 1, wherein the light source device is a light source device. The second holding member is provided with a plurality of slits and a plurality of holes extending radially around the rotation axis.
The light source device according to claim 1, wherein the light source device is a light source device. The length from the rotation axis to the end of the first holding member in the direction orthogonal to the rotation axis is from the rotation axis to the end of the second holding member in the direction orthogonal to the rotation axis. Longer than the length,
The light source device according to claim 2, wherein the light source device is a light source device. The length from the rotation axis to the end of the rotation member in the direction orthogonal to the rotation axis is R1,
When the length from the rotation axis in the direction orthogonal to the rotation axis to the end of the first holding member is R2,
0.3 ≦ R2 / R1 ≦ 0.8
The light source device according to any one of claims 2 to 11, wherein: The length from the rotation axis in the direction orthogonal to the rotation axis to the end of the first holding member is R2,
When the length from the rotation axis in the direction orthogonal to the rotation axis to the end of the second holding member is R3,
1.1 ≦ R2 / R3 ≦ 2.5
The light source device according to any one of claims 2 to 12, wherein: A light modulation element;
A light source device according to any one of claims 1 to 13,
A light guide optical system that guides light from the light source device to the light modulation element,
A projection type display device characterized by that. A projection optical system for guiding light from the light guide optical system to a projection surface;
A housing for holding the light modulation element, the light source device, the light guide optical system, and the projection optical system;
The projection display device according to claim 14. The projection optical system is detachable from the housing.
The projection display device according to claim 15. A projection display device according to any one of claims 14 to 16,
A projection surface onto which light from the projection display device is projected;
A control device for controlling the projection display device,
A projection display system characterized by that.

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