CN219872082U

CN219872082U - Light source device and projector

Info

Publication number: CN219872082U
Application number: CN202090001210.1U
Authority: CN
Inventors: 川濑亮祐
Original assignee: Sharp NEC Display Solutions Ltd
Current assignee: Sharp NEC Display Solutions Ltd
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2023-10-20
Anticipated expiration: 2030-08-17
Also published as: WO2022038651A1

Abstract

The utility model provides a light source device capable of adjusting the distance between a lens and a phosphor wheel with high precision while maintaining dustproof performance. The light source device comprises: a phosphor wheel (1) that receives excitation light and emits fluorescence; a lens element (2) for condensing excitation light on the phosphor wheel so that the fluorescence emitted from the phosphor wheel is incident; a wheel holder (3) for holding a phosphor wheel; a lens holder (4) fixed to the wheel holder for holding the lens element; and a housing case (5) which houses the phosphor wheel and the lens element and has an opening. The wheel holder is fixed to the housing case via a dust-proof elastic body (6) so as to block the opening. The lens holder is insertable with a spacer (7), which spacer (7) is used to adjust the distance between the lens element and the phosphor wheel.

Description

Light source device and projector

Technical Field

The present utility model relates to a light source device and a projector.

Background

To reduce maintenance work such as replacement or cleaning of a dust-proof filter, a projector having a dust-proof structure is provided. Such a projector includes, for example, a light source device having a dust-proof structure in which a phosphor wheel, a lens, and the like are housed in a housing. The housing case has an opening for housing the phosphor wheel. A lens holder holding a lens for condensing excitation light on the phosphor wheel is fixed to a base (bottom surface) of the housing case. The wheel holder holding the phosphor wheel is fixed to the housing case via a dust-proof tube so as to block the opening.

As a related art, patent document 1 describes a projector having a light source unit including a phosphor. The light source unit is accommodated in the housing. The housing is provided with an opening for replacement of the light source unit. By inserting the light source unit, the opening can be closed.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2017-125891

Disclosure of Invention

Problems to be solved by the utility model

However, in the light source device having the above-described dust-proof structure, it is difficult to make the distance between the lens fixed to the base side and the phosphor wheel fixed to the opening side the same as the design value. Therefore, the distance between the lens and the phosphor wheel may deviate from the design value, and the optical efficiency may be lowered. Here, the optical efficiency includes, for example, conversion efficiency (also referred to as quantum yield) between excitation light and fluorescence, light utilization efficiency represented by a ratio of the amount of fluorescence incident on the lens to the amount of fluorescence emitted from the phosphor wheel, and the like.

The distance between the lens and the phosphor wheel can be adjusted by inserting a spacer between the wheel holder and the opening portion of the housing case. However, the dust-proof tube is sandwiched between the wheel holder and the opening portion of the housing case. Therefore, when the spacer is inserted between the wheel holder and the opening portion of the housing case, the compression ratio of the dust tube varies depending on the thickness of the spacer, and as a result, the dust-proof performance may be degraded.

Means for solving the problems

The present utility model has been made to solve the above-described problems, and an object of the present utility model is to provide a light source device and a projector capable of adjusting a distance between a lens and a phosphor wheel with high accuracy while maintaining dustproof performance.

In order to achieve the above object, a light source device according to an aspect of the present utility model includes: a phosphor wheel that receives excitation light and emits fluorescence; a lens element for condensing the excitation light on the phosphor wheel to allow the fluorescence emitted from the phosphor wheel to enter; a wheel holder holding the phosphor wheel; a lens holder fixed to the wheel holder, holding the lens element; and a housing case housing the phosphor wheel and the lens element and having an opening. The wheel holder is fixed to the housing case via a dustproof elastic body so as to block the opening. The lens holder is capable of insertion of a spacer for adjusting a distance between the lens element and the phosphor wheel.

A projector according to another aspect of the present utility model includes: the light source device; an image forming unit configured to modulate light emitted from the light source device to form an image; and a projection lens that projects the image formed by the image forming unit.

Effects of the utility model

According to the present utility model, the distance between the lens and the phosphor wheel can be adjusted with high accuracy while maintaining the dustproof performance.

Drawings

Fig. 1 is a schematic view showing the structure of a light source device according to a first embodiment of the present utility model.

Fig. 2 is an external view of the projector.

Fig. 3 is a perspective view of an optical engine mounted on a projector.

Fig. 4 is a block diagram schematically showing an internal structure of the optical engine shown in fig. 3.

Fig. 5 is a perspective view for explaining the overall structure of a light source device according to a second embodiment of the present utility model.

Fig. 6 is an exploded view of an assembled structure of the phosphor wheel, the lens, and the housing case.

Fig. 7 is a view schematically showing a cross section of the assembled structure shown in fig. 6.

Fig. 8 is a diagram for explaining a method of measuring the positional displacement of the phosphor wheel.

Fig. 9 is a diagram for explaining a method of determining the shim adjustment amount.

Fig. 10 is an exploded view of an assembled structure of the phosphor wheel, the lens, and the housing case.

Fig. 11 is a cross-sectional view of the assembled structure shown in fig. 10.

Fig. 12 is an exploded view showing the structure of a light source device according to a third embodiment of the present utility model.

Fig. 13A is a perspective view of a wheel carriage holding a phosphor wheel.

Fig. 13B is a side view of a wheel carriage holding a phosphor wheel.

Fig. 13C is a front view of a wheel carriage holding a phosphor wheel.

Fig. 14A is a perspective view of the first holder portion when viewed from the lens side.

Fig. 14B is a perspective view of the first holder portion when viewed from the phosphor wheel side.

Fig. 15A is a schematic view showing a case where the first bracket portion is assembled to the second bracket portion via the spacer.

Fig. 15B is a schematic view showing a case where the phosphor wheel and the second holder portion are assembled to the wheel holder.

Fig. 16A is a perspective view showing a state in which the phosphor wheel, the lens, the first holder portion, the second holder portion, the spacer, and the platen are assembled.

Fig. 16B is a side view showing a state in which the phosphor wheel, the lens, the first holder portion, the second holder portion, the spacer, and the platen are assembled.

Fig. 16C is a front view showing a state in which the phosphor wheel, the lens, the first holder portion, the second holder portion, the spacer, and the platen are assembled.

Fig. 17 is a cross-sectional view showing the structure of a light source device according to a fourth embodiment of the present utility model.

Detailed Description

Next, an embodiment of the present utility model will be described with reference to the drawings.

(first embodiment)

Fig. 1 is a schematic view showing the structure of a light source device according to a first embodiment of the present utility model. Fig. 1 schematically illustrates each component, and the shape and size thereof may be different from those of the actual ones.

Referring to fig. 1, the light source device includes a phosphor wheel 1, a lens element 2, a wheel holder 3, a lens holder 4, and a housing case 5 having an opening.

The phosphor wheel 1 receives excitation light and emits fluorescence. For example, the phosphor wheel 1 includes a rotating substrate transparent to visible light that is rotated by a motor. A fluorescent layer including a fluorescent material emitting yellow fluorescent light is formed on one surface of the rotary substrate, for example, along the circumferential direction. A reflecting member is provided between the fluorescent layer and the rotary substrate to reflect the fluorescent light incident from the fluorescent layer toward the fluorescent layer. The reflection member can be omitted by forming the rotary substrate from a metal material.

The lens element 2 is configured to condense excitation light on the phosphor wheel 1, and to allow the fluorescent light emitted from the phosphor wheel 1 to enter. Here, the lens element 2 is composed of two lenses 2a, 2b. However, the number of lenses constituting the lens element 2 is not limited to two. The lens element 2 may be constituted by three or more lenses.

The wheel holder 3 holds the phosphor wheel 1. Specifically, the motor portion of the phosphor wheel 1 is fixed to the wheel holder 3. The lens holder 4 holds the lens element 2 and is fixed to the wheel holder 3. The housing case 5 houses the phosphor wheel 1 and the lens element 2. The wheel holder 3 is fixed to the housing case 5 via a dustproof elastic body 6 so as to close the opening. The opening has a size in which the lens element 2 and the phosphor wheel 1 can be inserted. The elastic body 6 may be a rubber member such as a dust pipe.

The lens holder 4 can be inserted with a spacer 7, which spacer 7 is used to adjust the distance between the lens element 2 and the phosphor wheel 1. For example, the outer peripheral portion of the lens surface (lens surface of the lens 2 a) on the phosphor wheel 1 side is formed as a flat portion. The lens holder 4 has a receiving surface that receives the flat portion of the lens surface. The gasket 7 is interposed between the receiving surface and the flat portion. The structure for inserting the spacer 7 is not limited to the structure constituted by the flat portion of the lens surface and the receiving surface of the lens holder 4. The lens holder 4 may have any insertion structure as long as the spacer 7 can be inserted and the distance between the lens element 2 and the phosphor wheel 1 can be adjusted.

The light source device according to the present embodiment has the following operational effects.

First, as a comparative example, a light source device in which a lens holder is fixed to a base of a housing case and a wheel holder is fixed to an opening of the housing case is considered. The positional relationship of the lens and the phosphor wheel has a great influence on the optical efficiency. In the comparative example, positional displacement occurs due to component errors (dimensional deviations) in the assembly of the phosphor wheel and the wheel holder, the assembly of the wheel holder and the housing case, and the assembly of the lens holder and the housing case, respectively. Due to positional displacement in these assemblies, it is difficult to dispose the phosphor wheel and the lens at the same distance as the design value.

When the distance between the phosphor wheel and the lens is deviated from the design value, for example, the spot diameter of the excitation light becomes smaller or larger than a predetermined value. When the spot diameter becomes smaller, the temperature of the phosphor increases, and as a result, the conversion efficiency (quantum yield) between excitation light and fluorescence decreases. On the other hand, when the spot diameter becomes larger, the light utilization efficiency, which is the ratio of the amount of fluorescence incident on the lens to the amount of fluorescence emitted from the phosphor wheel, decreases. In this way, when the distance between the phosphor wheel and the lens deviates from the design value, optical efficiency such as conversion efficiency (quantum yield) between excitation light and fluorescence and light utilization efficiency decreases.

The distance between the phosphor wheel and the lens can be adjusted by inserting a spacer between the wheel holder and the opening portion of the housing case. In general, a wheel holder holding a phosphor wheel is attached to a measuring device, and a distance from a reference surface of the wheel holder to a wheel surface is measured while rotating the phosphor wheel. The shim adjustment amount is determined based on the difference between the measured value and the design size. However, in the comparative example, since the housing case is interposed between the wheel holder and the lens holder, it is difficult to accurately adjust the positional displacement when a method of determining the shim adjustment amount with reference to the wheel holder is applied.

Further, since the dust-proof tube is interposed between the wheel holder and the opening portion of the housing case, the compression ratio of the dust-proof tube changes depending on the thickness of the gasket when the gasket is inserted, and as a result, the dust-proof performance sometimes decreases.

In contrast, in the light source device of the present embodiment, the lens holder 4 is directly fixed to the wheel holder 3, which is a reference for determining the shim adjustment amount, instead of the housing case 5. Therefore, by applying the method of determining the shim adjustment amount described above and inserting the shim 7, the distance between the phosphor wheel 1 and the lens element 2 can be adjusted with high accuracy.

Further, since the spacer 7 is inserted into the lens holder 4, the compression ratio of the elastic body 6 is not changed. Therefore, the dustproof performance of the housing case 5 can be maintained.

The configuration of the light source device according to the present embodiment described above is an example, and the following modifications may be applied, for example.

The lens holder 4 may include a cylindrical portion that accommodates the phosphor wheel 1. According to this configuration, when the phosphor wheel 1 is accommodated in the accommodation case 5, the phosphor wheel 1 can be prevented from coming into contact with the opening and being damaged.

The lens holder 4 may have a first holder portion for holding the lens element 2 and a second holder portion fixed to the wheel holder 3 and joined to the first holder portion. In this case, the joint portion between the first bracket portion and the second bracket portion is capable of inserting the gasket. The second holder portion may be formed of a tube portion that accommodates the phosphor wheel.

The gasket 7 may be formed of a circular metal sheet.

The lens element 2 may be composed of a lens 2a and a lens 2b, and the lens holder 4 may include a spacer for supporting surfaces of the first lens and the second lens, which are opposed to each other, and a pressing plate for biasing the lens 2b in the direction of the lens 2a side. The pressing plate is, for example, a plate spring, and stainless steel, spring steel, resin, or the like can be used. The amount of deflection of the platen varies depending on the thickness of the shim 7. Therefore, depending on the thickness of the spacer 7, plastic deformation of the pressing plate may occur. In order to suppress plastic deformation of the platen, the spacer may be formed of an elastic member.

Also, the assembly direction of the wheel holder 3 and the assembly direction of the lens holder 4 may be the same.

Further, a projector may be provided which includes the light source device, an image forming unit that modulates light emitted from the light source device to form an image, and a projection lens that projects the image formed by the image forming unit.

(second embodiment)

Fig. 2 is an external view of the projector. Fig. 3 is a perspective view of an optical engine mounted on a projector. Fig. 4 is a block diagram schematically showing an internal structure of the optical engine shown in fig. 3. Fig. 5 is a perspective view for explaining the overall structure of a light source device according to a second embodiment of the present utility model. Fig. 6 is an exploded view of an assembled structure of the phosphor wheel, the lens, and the housing case. Fig. 7 is a view schematically showing a cross section of the assembled structure shown in fig. 6.

The configuration of the light source device and the projector will be specifically described below with reference to fig. 2 to 7.

As shown in fig. 2 and 3, the projector P includes a housing 90 that houses an optical engine 100. The optical engine 100 includes a light source unit 50, an illumination unit 60, an imaging unit 70, and a projection lens 80.

Fig. 4 shows the detailed structures of the light source unit 50, the illumination unit 60, the imaging unit 70, and the projection lens 80. The light source section 50 includes a light source 51, lenses 52, 53, 55, 57, 58, a dichroic mirror 54, a reflective diffusion plate 56, and a phosphor wheel 20. The phosphor wheel 20 and the lens 57 correspond to the phosphor wheel 1 and the lens element 2 shown in fig. 1, respectively.

The light source 51 is constituted by a plurality of blue lasers. The lens 52 is constituted by a collimator lens provided for each blue laser, and converts the output light of each blue laser into a substantially parallel light beam. The lens 53 is composed of a plurality of lenses for converting the light emitted from the lens 52 into an appropriate beam diameter.

The dichroic mirror 54 has a first region and a second region having different reflection/transmission characteristics with respect to visible light. The first region has a characteristic of transmitting blue light and reflecting light in a wavelength range other than blue, and the second region has a characteristic of reflecting light in a wavelength range equal to or greater than blue. The area of the second region is sufficiently smaller than the first region. Here, "blue wavelength or higher" means that the wavelength of blue and the wavelength longer than the wavelength of blue are included.

Blue light emitted from the light source 51 is incident on the first region and the second region of the dichroic mirror 54 via the lenses 52 and 53. Blue light transmitted through the first region is incident on the phosphor wheel 20 via the lens 57. The blue light reflected in the second region is incident on the reflective diffusion plate 56 via the lens 55. The lenses 55 and 57 function as condenser lenses.

The reflective diffusion plate 56 diffuses and reflects blue light incident from the lens 55. The blue reflected light (diffuse light) from the reflective diffusion plate 56 is incident on the dichroic mirror 54 through the lens 55. The blue reflected light is incident on the first region and the second region, but the area of the second region is sufficiently smaller than that of the first region, so that most of the blue reflected light is transmitted through the first region.

In the phosphor wheel 20, the phosphor is excited by blue light (excitation light) incident through the lens 57. The fluorescent material subjected to excitation light emits yellow fluorescence. Yellow fluorescent light (diffuse light) emitted from the fluorescent material is incident on the dichroic mirror 54 through the lens 57. The yellow fluorescent light is reflected toward the lens 58 through the first region and the second region.

That is, the dichroic mirror 54 reflects a part of the blue light from the light source 51 in the direction of the reflective diffusion plate 56, and emits the remaining part as excitation light in the direction of the phosphor wheel 20. The dichroic mirror 54 emits the color light (B light+y light) obtained by combining the blue light from the reflective diffusion plate 56 and the yellow fluorescence from the phosphor wheel 20, in the direction of the lens 54. The color light (B light+y light) passing through the lens 54 is output light from the light source unit 50. The Y light contains a green component and a red component.

The illumination unit 60 includes an integrator 61, a polarization beam splitter 62, field lenses 63-1 to 63-3, dichroic mirrors 64-1 and 64-2, and reflecting mirrors 65-1 to 65-3, and relay lenses 66-1 and 66-2.

The output light (B light+y light) from the light source unit 50 enters the integrator 61. The integrator 61 is a light uniformizing element used to obtain a uniform illuminance distribution. The integrator 61 has a first lens array and a second lens array in which a plurality of lenses are arranged in a matrix. The first lens array and the second lens array are arranged in parallel so that the lens surfaces of the first lens array and the second lens array face outward. As the first lens array and the second lens array, for example, fly-eye lenses can be used. The output light from the integrator 61 enters the polarization beam splitter 62.

The polarization beam splitter 62 is a polarization conversion element that matches the polarization direction of incident light with p-polarized light or s-polarized light. The outgoing light (p-polarized light or s-polarized light) of the polarization beam splitter 62 enters the dichroic mirror 64-1 via the field lens 63-1.

The dichroic mirror 64-1 has a characteristic of reflecting light in a wavelength range of blue in visible light and transmitting light in other wavelength ranges. The B light of the output light (b+y) of the light source unit 50 is reflected by the dichroic mirror 64-1, and the Y light passes through the dichroic mirror 64-1. The B light reflected by the dichroic mirror 64-1 passes through the field lens 63-2 and the reflecting mirror 65-1 in order and is incident on the imaging section 70. The Y light transmitted through the dichroic mirror 64-1 is incident on the dichroic mirror 64-2 via the field lens 63-2.

The dichroic mirror 64-2 has a characteristic of reflecting light of a wavelength equal to or lower than green in visible light and transmitting light of other wavelength ranges. The light (G light) of the green component among the Y light transmitted through the dichroic mirror 64-1 is reflected by the dichroic mirror 64-2, and the light (R light) of the red component is transmitted through the dichroic mirror 64-2. The G light reflected by the dichroic mirror 64-2 is incident on the imaging section 70. The R light transmitted through the dichroic mirror 64-2 passes through the relay lens 66-1, the reflecting mirror 65-2, the relay lens 66-2, and the reflecting mirror 65-3 in this order, and is incident on the imaging section 70.

The imaging section 70 includes light modulator sections 71R, 71G, and 71B, and a cross dichroic prism 72. The light modulator sections 71R, 71G, and 71B each have the same configuration, and include a Liquid Crystal Display (LCD) and two polarizing plates provided on the incident surface side and the emission surface side of the LCD, respectively.

The illumination unit 60 outputs R light, G light, and B light, respectively, and the R light is incident on the light modulator unit 71R, the G light is incident on the light modulator unit 71G, and the B light is incident on the light modulator unit 71B. The light modulator 71R modulates R light based on the red video signal to form a red image. The light modulation element portion 71G modulates the G light based on the green video signal to form a green image. The light modulation element portion 71B modulates blue light based on the blue video signal to form a blue image.

The cross dichroic prism 72 has first to third incident surfaces and an exit surface. The light modulator portion 71R is disposed on the first incidence plane side, the light modulator portion 71G is disposed on the second incidence plane side, and the light modulator portion 71B is disposed on the third incidence plane side. In the cross dichroic prism 72, the red image light formed in the light modulator portion 71R is incident on the first incident surface, the green image light formed in the light modulator portion 71G is incident on the second incident surface, and the blue image light formed in the light modulator portion 71B is incident on the third incident surface. Image light including red image light, green image light, and blue image light is emitted from the emission surface.

The projection lens 80 is disposed on the emission surface side of the cross dichroic prism 72. The image light emitted from the emission surface of the cross dichroic prism 72 enters the projection lens 80. The projection lens 80 projects the red, green, and blue images formed in the light modulation element sections 71R, 71G, and 71B.

The outline of each component of the projector P is described above.

Next, the structure of the light source device according to the present embodiment will be described with reference to fig. 5 to 7.

The light source device of the present embodiment includes a housing case 10 having a dust-proof structure for housing each constituent element of the light source unit 50. The housing case 10 has a substantially rectangular parallelepiped shape, and has an upper surface, a bottom surface, and first to fourth side surfaces.

As shown in fig. 5, in the housing case 10, the first side surface communicates with the illumination portion 60. The second side surface has an opening, and the wheel holder 21 is fixed to the second side surface via the dust pipe 16a so as to close the opening. The third side surface is also provided with an opening, the sirocco fan 13 is attached so as to close the opening, and the sirocco fan cover 14 is fixed to the third side surface via the dust pipe 16 b. A radiator 15 for cooling the light source is fixed to the fourth side surface. The upper surface is provided with an opening, and the light source cover 11 is fixed to the upper surface via the dust pipe 16c so as to close the opening. The bottom surface also has an opening, and the light source cover 12 is fixed to the bottom surface via the dust pipe 16d so as to close the opening. Fins 12a and 12b are formed on the inner surface and the outer surface of the light source cover 12, respectively.

As shown in fig. 6 and 7, the wheel holder 21 holds the phosphor wheel 20. The lens holder 22 holds a lens 57. The lens 57 condenses the excitation light on the phosphor wheel, and the fluorescence emitted from the phosphor wheel enters the lens 57. The lens holder 22 holding the lens 57 is fixed to the wheel holder 21. The lens holder 22 includes a cylindrical portion surrounding the phosphor wheel 20. The lens holder 22 can insert the spacer 23 into a portion holding the lens 57.

In the light source device of the present embodiment, the distance between the lens 57 and the phosphor wheel 20 can be adjusted to be the same as the design value with high accuracy using the spacer 23. For example, as shown in fig. 8, a wheel holder 21 holding the phosphor wheel 20 is attached to a measuring device, not shown, and the distance D1 from the reference surface 21a to the surface of the phosphor layer of the phosphor wheel 20 is measured while rotating the phosphor wheel 20. In general, the phosphor wheel 20 has a deviation in the assembly position in the optical axis direction, a shimmy cross (so-called plane shimmy), and the like. Therefore, the distance D1 is measured while rotating the phosphor wheel 20, and the average value thereof is obtained. Then, the adjustment amount of the spacer 23 is determined based on the difference between the measured value (average value) of the distance D1 and the design size. By inserting the spacer 23 having a thickness corresponding to the adjustment amount, the distance D2 between the lens 57 and the surface of the phosphor layer of the phosphor wheel 20 can be set to a design value as shown in fig. 9.

The following describes the operation and effects of the light source device of the present embodiment.

As a comparative example, fig. 10 is an exploded view of an assembled structure of the phosphor wheel 20, the lens 57, and the housing case 10-1, and fig. 11 is a schematic cross section thereof.

As shown in fig. 10 and 11, in the comparative example, the lens holder 22-1 holding the lens 57 is fixed to the bottom surface (base) of the housing case 10-1. The housing case 10-1 has substantially the same structure as the housing case 10. The wheel holder 21-1 holding the phosphor wheel 20 is fixed to the second side surface of the housing case 10-1 via the dust-proof tube 16 a. By inserting four spacers 23-1 between the second side of the housing case 10-1 and the wheel holder 21-1, the distance between the lens 57 and the phosphor wheel 20 can be adjusted.

However, in the assembled structure of the comparative example, since the housing case 10-1 is interposed between the lens 57 and the phosphor wheel 20, it is difficult to accurately adjust the positional displacement when the method of determining the shim adjustment amount with reference to the wheel holder as shown in fig. 8 is applied.

Further, as shown in fig. 11, since the dust-proof tube 16a is sandwiched between the wheel holder 21-1 and the housing case 10-1, the compression rate of the dust-proof tube 16a changes when the gasket 23-1 is inserted. As a result, the dust-proof performance is lowered.

In contrast, in the light source device of the present embodiment, as shown in fig. 6 and 7, the lens holder 22 holding the lens 57 is directly fixed to the wheel holder 22 as a reference for determining the shim adjustment amount. Therefore, by applying the method of determining the shim adjustment amount shown in fig. 8 and inserting the shim 23, the distance between the phosphor wheel 20 and the lens 57 can be adjusted with high accuracy.

Further, since the spacer 23 is inserted into the lens holder 22, the compression ratio of the dust-proof tube 16a is not changed. Therefore, the dustproof performance of the housing case 10 can be maintained.

In the comparative example, four spacers 23-1 were used, whereas in the light source device of the present embodiment, one spacer 23 was used. Therefore, reduction in component cost and improvement in adjustment accuracy can be expected.

Further, in the comparative example, the wheel holder 21-1 holding the phosphor wheel 20 is assembled in the optical axis direction (Z-axis direction), but the lens holder 22-1 holding the lens 57 is assembled in the direction perpendicular to the optical axis direction. In contrast, in the light source device of the present embodiment, the wheel holder 21 holding the phosphor wheel 20 and the lens holder 22 holding the lens 57 are assembled in the optical axis direction. By matching the assembly direction with the optical axis direction in this way, the adjustment by the spacer 23 can be made more accurate.

(third embodiment)

As shown in fig. 12, the light source device of the embodiment includes a wheel holder 21 for holding the phosphor wheel 20, a lens holder 22 for holding the lens 57, and a housing case 10 having a dust-proof structure. The configuration is substantially the same as that described in the second embodiment except that the configuration of the lens holder 22 and the insertion configuration of the spacer 23 are different. The lens 57 is composed of two lenses 57a and 57b. The lens holder 22 has a first holder portion 22a, a second holder portion 22b, a spacer 22c, and a pressing plate 22d.

Fig. 13A, 13B, and 13C show a perspective view, a side view, and a front view, respectively, of the wheel holder 21 holding the phosphor wheel 20. As shown in fig. 13A, 13B, and 13C, the wheel holder 21 has a phosphor wheel receiving surface 21a for fixing the phosphor wheel 20 and a lens holder receiving surface 21B for fixing the lens holder 22. The lens holder receiving surface 21b can be used as a reference for determining the shim adjustment amount. The lens holder receiving surface 21b is provided on the lens holder receiving surface 21b.

Fig. 14A shows a perspective view of the first holder portion 22a when viewed from the lens 57 side. As shown in fig. 14A, the first holder portion 22a has a cylindrical shape, and has a lens receiving surface 22a-1 for holding the lens 57a at an inner wall portion of the cylindrical portion. The lens 57a is a plano-convex lens, and an outer peripheral portion (flat portion) of the lens surface on the plane side is in contact with the lens receiving surface 22a-1.

Fig. 14B shows a perspective view of the first holder portion 22a when viewed from the phosphor wheel 20 side. The first holder portion 22a has a plurality of pad receiving surfaces 22a-2 on the outer peripheral portion of the cylindrical portion. Each pad receiving surface 22a-2 has a through hole. The spacer 23 is a ring-shaped metal sheet, and has an inner diameter larger than an outer diameter of the cylindrical portion of the first holder portion 22a. The cylindrical portion of the first holder portion 22a can be inserted into the spacer 23. The spacer 23 has a through hole at a portion abutting against each spacer receiving surface 22a-2. The spacer 23 is attached to the first bracket portion 22a such that the through holes of the spacer 23 and the through holes of the spacer receiving surfaces 22a-2 coincide with each other.

Fig. 15A shows a case where the first holder portion 22a is assembled to the second holder portion 22b via the spacer 23. As shown in fig. 15A, the second holder portion 22b is constituted by a cylindrical portion capable of accommodating the phosphor wheel 20, and has a holder joint surface 22b-1 and a plurality of pad receiving surfaces 22b-2 at a portion on the lens 57 side of the cylindrical portion. Each of the pad receiving surfaces 22b-2 has a through hole, and faces each of the pad receiving surfaces 22a-2 of the first bracket portion 22a. The surface of the first holder portion 22a on the phosphor wheel 20 side is engaged with the holder engaging surface 22 b-1. The gasket 23 is sandwiched between the gasket receiving surfaces 22a-2 and 22b-2 so that the through holes thereof coincide with each other. For example, an internal thread for screw tightening is formed in the through hole of the spacer receiving surface 22b-2. The first bracket portion 22a can be fixed to the second bracket portion 22b by screw-fastening the respective shim receiving surfaces 22a-2 and the respective shim receiving surfaces 22b-2 with the shims 23 interposed therebetween.

Fig. 15B shows a case where the phosphor wheel 20 and the second holder portion 22B are assembled to the wheel holder 21. As shown in fig. 15B, the motor portion of the phosphor wheel 20 is screwed to the phosphor wheel receiving surface 21a. The second holder portion 22b has a plurality of through holes 22b-3 on a surface that abuts against the lens holder receiving surface 21b. The second bracket portion 22b is screwed to the lens bracket receiving surface 21b through the through holes 22b-3 so as to cover the phosphor wheel 20 fixed to the phosphor wheel receiving surface 21a.

Fig. 16A, 16B, and 16C are diagrams showing a state in which the phosphor wheel 20, the lens 57, the first holder portion 22a, the second holder portion 22B, the spacer 22C, and the platen 22d are assembled, respectively, in perspective view, side view, and front view.

As shown in fig. 16A, 16B, and 16C, the first holder portion 22a holds a lens 57B opposing the lens 57 a. The spacer 22c is provided between the lenses 57a and 57b. The spacer 22c supports the faces of the lens 57a and the lens 57b that face each other. The spacer 22c may also be constituted by, for example, an elastic member. The pressing plate 22d acts to bias the lens 57b in the direction of the lens 57a side. The pressing plate 22d is, for example, a plate spring, and stainless steel, spring steel, resin, or the like can be used.

Referring again to fig. 12. The lenses 57a, 57b, the spacer 22c, and the pressing plate 22d are screwed to the second holder portion 22b in a state assembled to the first holder portion 22a. The phosphor wheel 20 is screwed to the phosphor wheel receiving surface 21a of the wheel holder 21. Further, the second bracket portion 22b is screwed to the lens bracket receiving surface 21b of the wheel bracket 21. In this way, the wheel holder 21, in which the lens 57, the respective members of the lens holder 22, and the phosphor wheel 20 are assembled, is housed in the housing case 10.

The light source device according to the present embodiment also has the same operational effects as those of the second embodiment.

In addition, the deflection amount of the pressing plate 22d varies according to the thickness of the spacer 23. Therefore, depending on the thickness of the spacer 23, plastic deformation of the pressing plate 22d may occur. In the present embodiment, by configuring the spacer 22c with an elastic member, plastic deformation of the pressing plate 22d can be suppressed.

(fourth embodiment)

Fig. 17 is a cross-sectional view showing the structure of a light source device according to a fourth embodiment of the present utility model. The light source device of the present embodiment has substantially the same structure as that of the third embodiment except that the insertion position of the spacer 23 is different. As shown in fig. 17, in the light source device of the present embodiment, the spacer 23 is interposed between the surface of the first holder portion 22a on the side of the phosphor wheel 20 and the holder joint surface 22b-1 of the second holder portion 22b.

According to the light source device of the present embodiment, the distance between the phosphor wheel 20 and the lens 57 can be adjusted with high accuracy by inserting the spacer 23 between the first holder portion 22a and the second holder portion 22b. According to this spacer insertion structure, in addition to the same operational effects as the third embodiment, since the deflection amount of the pressing plate 22d does not change according to the thickness of the spacer 23, plastic deformation of the pressing plate 22d can be prevented.

Description of the reference numerals

1. Phosphor wheel

2. Lens element

2a, 2b lens

3. Wheel support

4. Lens holder

5. Housing shell

6. Elastic body

7. Gasket

Claims

1. A light source device, comprising:

a phosphor wheel that receives excitation light and emits fluorescence;

a lens element for condensing the excitation light on the phosphor wheel to allow the fluorescence emitted from the phosphor wheel to enter;

a wheel holder holding the phosphor wheel;

a lens holder fixed to the wheel holder, holding the lens element; and

a housing case housing the phosphor wheel and the lens element and having an opening,

the wheel holder is fixed to the housing case via a dustproof elastic body so as to block the opening,

the lens holder is capable of insertion of a spacer for adjusting a distance between the lens element and the phosphor wheel.

2. A light source device according to claim 1, wherein,

the outer peripheral portion of the lens face of the phosphor wheel side of the lens element is formed as a flat portion,

the lens holder includes a receiving surface that receives the flat portion of the lens surface,

the gasket is interposed between the receiving surface and the flat portion.

3. A light source device according to claim 1 or 2, wherein,

the lens holder includes a tube portion that accommodates the phosphor wheel.

4. A light source device according to claim 1, wherein,

the lens holder has:

a first holder portion holding the lens element; and

a second bracket part fixed to the wheel bracket and engaged with the first bracket part,

the joint between the first bracket part and the second bracket part can be used for inserting the gasket.

5. A light source device according to claim 4, wherein,

the second holder portion is formed of a tube portion that accommodates the phosphor wheel.

6. A light source device according to claim 1 or 2, wherein,

the gasket is formed by annular sheet metal.

7. A light source device according to claim 1 or 2, wherein,

the lens element has:

a first lens having the flat portion; and

a second lens disposed on a side of the first lens opposite to the phosphor wheel side so as to face the first lens,

the lens holder has:

a spacer supporting surfaces of the first lens and the second lens which face each other; and

and a pressing plate for applying force to the second lens in the direction of the first lens side.

8. A light source device according to claim 7, wherein,

the spacer is constituted by an elastic member.

9. A light source device according to claim 1 or 2, wherein,

the assembly direction of the wheel support is the same as the assembly direction of the lens support.

10. A projector, characterized by comprising:

the light source device of claim 1 or 2;

an image forming unit configured to modulate light emitted from the light source device to form an image; and

and a projection lens configured to project the image formed by the image forming unit.