JP2013109283A - Light source device and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device in which rotational balance of a substrate having a fluorescent material is adjusted and a reduction in size is achieved, and further to provide a projector.SOLUTION: A light source device comprises: a substrate having a fluorescent material; a driving device that is provided at a first surface side of the substrate and drives to rotate the substrate around a predetermined rotational axis; a balance adjusting members for adjusting balance of the substrate; and an optical system to which fluorescent light emitted from the fluorescent material is made incident. In the light source device, the optical system is provided so as to face a second surface of the substrate facing the first surface, and the balance adjusting members is provided on the first surface.

Description

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

  In recent years, with regard to high performance projectors, as a light source device with a wide color gamut and a high efficiency, a fluorescent layer that is excited by laser light to emit fluorescence and is rotated by a driving device such as a motor is provided. What you have is known. Fluorescent light emitted from the phosphor layer is condensed at a desired position by an optical system arranged close to the opposite side of the driving device in the fluorescent rotating plate.

By the way, it is desirable to adjust the rotational balance of such a fluorescent rotating plate in consideration of eccentricity or the like in order to obtain good rotational characteristics.
For example, Patent Document 1 below discloses that a projector using a color wheel is provided with a member for balancing rotation with respect to the color wheel that is rotationally driven by a driving device. In this technique, for example, a balancing member is provided on the surface of the color wheel on the side opposite to the driving device from the viewpoint of ease of assembly.

JP 2004-325721 A

  It is also conceivable to adjust the rotational balance of the fluorescent rotating plate by combining the above technique with a fluorescent rotating plate having a phosphor layer as described above. However, in the configuration related to such a combination, it is necessary to open a space between the fluorescent rotating plate and the optical system so that the balance adjusting member and the optical system do not interfere with each other, and as a result, the light source device is sufficiently small. It may not be possible to

  The present invention has been made in view of such circumstances, and an object thereof is to provide a light source device and a projector in which the rotational balance of a substrate having a phosphor is adjusted and the size is reduced.

  In order to solve the above-described problems, a light source device of the present invention includes a substrate having a phosphor and a driving device that is provided on the first surface side of the substrate and that rotates the substrate around a predetermined rotation axis. And a balance adjusting member that adjusts the balance of the substrate, and an optical system that receives fluorescent light emitted from the phosphor, wherein the optical system faces the first surface. It is provided so as to face the second surface of the substrate, and the balance adjusting member is provided on the first surface.

  According to the light source device of the present invention, since the balance adjusting member is disposed on the first surface of the substrate on which the driving device is provided, it is possible to prevent the balance adjusting member from contacting the optical system. Therefore, since the substrate and the optical system can be arranged close to each other, it is possible to provide a light source device that is highly efficient in using fluorescent light and that is downsized.

  The light source device may further include an excitation light source that emits excitation light that excites the phosphor, and the excitation light is applied to the phosphor from the first surface side, and the excitation light is emitted from the optical axis direction of the excitation light. In view, it is preferable that the balance adjusting member is provided in a region of the substrate different from the region irradiated with the excitation light.

  According to this configuration, in the transmission type light source device in which the excitation light passes through the substrate, it is possible to prevent the occurrence of the problem that the excitation light is applied to the balance adjusting member and not the phosphor. Therefore, the excitation light can be efficiently applied to the phosphor.

  The light source device further includes an excitation light source that emits excitation light for exciting the phosphor, and the excitation light is applied to the phosphor from the second surface side and reflects the fluorescence light. Is preferably provided between the balance adjusting member and the phosphor.

  According to this structure, the freedom degree of arrangement | positioning of a balance adjustment member is high. That is, regardless of the arrangement of the balance adjusting member, the phosphor layer can be efficiently irradiated with excitation light. Therefore, as long as the balance adjustment member does not come into contact with the driving device, the balance adjustment member can be provided at an arbitrary position on the first surface of the substrate regardless of the excitation light incident area. Therefore, the rotation balance of the substrate can be adjusted with high accuracy.

  In the light source device, it is preferable that the balance adjusting member is provided in a region overlapping with the phosphor as viewed from the optical axis direction of the excitation light.

  According to this configuration, it is possible to adjust the rotation balance of the substrate with high accuracy while reducing the size of the substrate.

  In the light source device, it is preferable that the balance adjusting member is provided between the substrate and the driving device.

  According to this configuration, since the balance adjustment member is provided between the substrate and the drive device, the balance adjustment member and the drive device can be arranged in an overlapped state when viewed from the optical axis direction of the excitation light. Therefore, even when a small substrate is employed, the balance can be easily adjusted by the balance adjusting member.

  The projector of the present invention includes the light source device, a light modulation element that modulates the fluorescence emitted from the light source device with an image signal, a projection optical system that projects the fluorescence modulated by the light modulation element, It is characterized by providing.

  According to the projector of the present invention, as described above, since the optical system and the substrate are arranged close to each other, the light source device that is miniaturized is provided, so the projector itself including the light source device itself is also small. Can be.

It is a schematic diagram which shows the optical system of the projector which concerns on 1st Embodiment. It is a figure which shows the structure of the rotation fluorescent screen which concerns on 1st Embodiment. It is sectional drawing which shows the principal part structure of the rotating fluorescent screen which concerns on 1st Embodiment. It is a figure which shows the structure seen from the back surface side of the board | substrate about the rotation fluorescent screen which concerns on 1st Embodiment. It is a schematic diagram which shows the optical system of the projector which concerns on 2nd Embodiment. (A), (b) is a figure which shows the principal part structure of the rotating fluorescent screen which concerns on 2nd Embodiment. It is a figure which shows the principal part structure of the rotating fluorescent screen which concerns on a modification.

  Embodiments of the present invention will be described below with reference to the drawings. This embodiment shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, the scale, number, etc. in the actual structure are different.

(First embodiment)
FIG. 1 is a schematic diagram showing an optical system of a projector including a light source device to which the light source device of the present invention is applied. As shown in FIG. 1, the projector 100 includes a light source device 10A, a color separation light guide optical system 20, a liquid crystal light modulation device 40R as a light modulation device, a liquid crystal light modulation device 40G, and a liquid crystal light modulation device 40B. A dichroic prism 50 and a projection optical system 60 are provided.

  The light source device 10 </ b> A includes a light source 10, a first condenser lens 55, a rotating fluorescent plate 30, a collimating optical system 85, a second condenser lens 90, a rod integrator 80, and a collimating lens 70. That is, on the optical path of the excitation light EL emitted from the light source device 10, the first condenser lens 55, the rotating fluorescent plate 30, the collimating optical system 85, the second condenser lens 90, the rod integrator 80, and the collimating lens 70 are provided. Arranged in this order. The collimating optical system 85 constitutes an optical system in which fluorescent light emitted from the phosphor layer is incident in the present invention.

  For example, the light source 10 includes a laser light source array in which a plurality of laser light sources (light emitting elements) are two-dimensionally arranged along a row direction and a column direction on a base. The light source 10 emits blue (light emission intensity peak: around 450 nm) laser light as excitation light EL that excites a fluorescent material included in the rotating fluorescent plate 30 described later. The excitation light EL emitted from the light source 10 may be an excitation light source that emits colored light having a peak wavelength other than 450 nm as long as it is light having a wavelength that can excite a fluorescent material to be described later.

FIG. 2 is a diagram showing a configuration of the rotating fluorescent plate 30.
The rotating fluorescent plate 30 is a so-called transmission-type rotating fluorescent plate, and includes a disk-shaped substrate 31 and a motor 33 that rotationally drives the substrate 31 as shown in FIG. The motor 33 constitutes a driving device in the present invention. A phosphor layer 32 is formed on the surface 34 of the substrate 31 along the rotation direction. In the following description, for convenience, the surface of the substrate 31 on which the motor 33 is provided is referred to as a back surface 35, and the surface of the substrate 31 facing the back surface 35 is referred to as a front surface 34. Here, the front surface 34 of the substrate 31 constitutes the second surface of the present invention, and the back surface 35 of the substrate 31 constitutes the first surface of the present invention.

  The region where the phosphor layer 32 is formed includes a region S where the excitation light EL is incident (hereinafter also referred to as the excitation light incident region S). The excitation light EL enters the phosphor layer 32 through the substrate 31 from the back surface 35 side of the substrate 31. When the substrate 31 is rotationally driven by a motor 33 around a rotation shaft 33b described later, the excitation light incident area S moves relative to the substrate 31 around the rotation shaft 33b.

  The substrate 31 is made of a material that transmits the excitation light EL. As a material of the substrate 31, for example, quartz glass, crystal, sapphire, optical glass, transparent resin, or the like can be used. Although not shown, a dielectric multilayer film is provided on the surface of the substrate 31 opposite to the surface on which the phosphor layer 32 is provided. The dielectric multilayer film functions as a dichroic mirror, transmits light around 450 nm as excitation light EL, and transmits light of 490 nm or more including the wavelength range of fluorescence emitted from the phosphor layer 32 (490 nm to 750 nm). Is designed to reflect. The shape of the substrate 31 is not limited to a disk shape.

  The substrate 31 rotates at 7500 rpm during use. Although not described in detail, the substrate 31 has a diameter of 50 mm, and is configured such that the optical axis of the excitation light EL incident on the substrate 31 is located approximately 22.5 mm away from the rotation center of the substrate 31. . That is, the substrate 31 rotates at a rotation speed such that the condensing spot of the excitation light EL moves on the phosphor layer 32 at about 18 m / sec.

  In such a substrate 31, when the excitation light EL is incident on the phosphor layer 32, a portion corresponding to the excitation light incident region S of the phosphor layer 32 generates heat. Then, this heat-generated portion (heat-generating portion) moves in a circle around the rotation axis 33b as the substrate 31 rotates, and repeats a cycle of returning to the excitation light incident area S again. Thereby, the heat generating part is cooled in the process of movement.

  Laser light (blue light) emitted from the light source device 10 enters the phosphor layer 32 from the back surface 35 side as the excitation light EL through the dielectric multilayer film, and the excitation light EL enters the phosphor layer 32. Fluorescence (red light and green light) is emitted toward the surface 34 side opposite to the side.

  The phosphor layer 32 has phosphor particles made of a phosphor that emits fluorescence, and has a function of absorbing excitation light EL (blue light) and converting it into fluorescence of approximately 490 to 750 nm. This fluorescence includes green light (wavelength near 530 nm) and red light (wavelength near 630 nm).

  The phosphor particles are particulate fluorescent materials that absorb the excitation light EL emitted from the light source device 10 and emit fluorescence. For example, the phosphor particles include a substance that emits fluorescence when excited by blue light having a wavelength of about 450 nm, and includes a part of the excitation light EL from the red wavelength band to the green wavelength band ( It is converted into yellow light and emitted. A part of the excitation light EL is not converted to the yellow light. That is, white fluorescent light including red, green, and blue is emitted from the light source device 10.

As the phosphor particles, commonly known YAG (yttrium, aluminum, garnet) phosphors can be used. For example, a YAG phosphor having a composition represented by (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce having an average particle diameter of 10 μm can be used. The phosphor particle forming material may be one kind, or a mixture of particles formed using two or more kinds of forming materials may be used as the phosphor particles.

  The collimating optical system 85 is disposed on the optical path of light (excitation light EL and fluorescence) between the rotating fluorescent plate 30 and the second condenser lens 90. The collimating optical system 85 includes a first lens 81 that suppresses the spread of light from the rotating fluorescent plate 30, a second lens 82 that collimates the light incident from the first lens 81, and a base portion 83 that fixes the lenses. It is configured to include. The first lens 81 is made of, for example, a convex meniscus lens, and the second lens 82 is made of, for example, a convex lens. The collimating optical system 85 causes the light from the rotating fluorescent plate 30 to enter the second condenser lens 90 in a substantially parallel state.

  The 2nd condensing lens 90 consists of convex lenses, for example. The second condenser lens 90 is disposed on the light axis of the light that passes through the collimating optical system 85 (second lens 82), and condenses the light that has passed through the collimating optical system 85.

  The light transmitted through the second condenser lens 90 enters one end side of the rod integrator 80. The rod integrator 80 is a prismatic optical member that extends in the optical path direction. The light transmitted through the inside of the rod integrator 80 is subjected to multiple reflection, thereby mixing the light transmitted through the second condensing lens 90 to obtain a luminance distribution. It is to make it uniform. The cross-sectional shape orthogonal to the optical path direction of the rod integrator 80 is substantially similar to the outer shape of the image forming region of the liquid crystal light modulation device 40R, the liquid crystal light modulation device 40G, and the liquid crystal light modulation device 40B. The light emitted from the other end of the rod integrator 80 is collimated by the collimating lens 70 and emitted from the light source device 10A.

  The color separation light guide optical system 20 includes a dichroic mirror 21, a dichroic mirror 22, a reflection mirror 23, a reflection mirror 24, a reflection mirror 25, and a relay lens 26. The color separation light guide optical system 20 separates light from the light source device 10 into red light, green light, and blue light, and each color light of red light, green light, and blue light is an illumination target liquid crystal light modulation device 40R. The liquid crystal light modulation device 40G and the liquid crystal light modulation device 40B have a function of guiding light.

  The dichroic mirror 21 and the dichroic mirror 22 are mirrors in which a wavelength selective transmission film that reflects light in a predetermined wavelength region and transmits light in another wavelength region is formed on a substrate. Specifically, the dichroic mirror 21 transmits a blue light component and reflects a red light component and a green light component. The dichroic mirror 22 reflects the green light component and transmits the red light component.

  The reflection mirror 23, the reflection mirror 24, and the reflection mirror 25 are mirrors that reflect incident light. Specifically, the reflection mirror 23 reflects the blue light component transmitted through the dichroic mirror 21. The reflection mirror 24 and the reflection mirror 25 reflect the red light component transmitted through the dichroic mirror 22.

  The blue light transmitted through the dichroic mirror 21 is reflected by the reflection mirror 23 and enters the image forming region of the liquid crystal light modulation device 40B for blue light. The green light reflected by the dichroic mirror 21 is further reflected by the dichroic mirror 22 and enters the image forming area of the liquid crystal light modulation device 40G for green light. The red light transmitted through the dichroic mirror 22 enters the image forming region of the liquid crystal light modulation device 40R for red light through the incident-side reflection mirror 24, the relay lens 26, and the emission-side reflection mirror 25.

  As the liquid crystal light modulation device 40R, the liquid crystal light modulation device 40G, and the liquid crystal light modulation device 40B, commonly known devices can be used. For example, the liquid crystal element 41 and the polarizing element 42 and the polarizing element 43 that sandwich the liquid crystal element 41 are used. And a light modulation device such as a transmissive liquid crystal light valve. For example, the polarizing element 42 and the polarizing element 43 have a configuration in which the transmission axes are orthogonal to each other (crossed Nicol arrangement).

The liquid crystal light modulation device 40R, the liquid crystal light modulation device 40G, and the liquid crystal light modulation device 40B modulate incident color light in accordance with image information to form a color image, and are an illumination target of the light source device 10A. The liquid crystal light modulation device 40R, the liquid crystal light modulation device 40G, and the liquid crystal light modulation device 40B perform light modulation of each incident color light.

  For example, the liquid crystal light modulation device 40R, the liquid crystal light modulation device 40G, and the liquid crystal light modulation device 40B are transmission type liquid crystal light modulation devices in which liquid crystal is hermetically sealed in a pair of transparent substrates, and are provided with polysilicon TFTs as switching elements. The polarization direction of one kind of linearly polarized light emitted from the polarization element 42 on the incident side is modulated in accordance with the received image information.

  The cross dichroic prism 50 is an optical element that forms a color image by combining optical images modulated for each color light emitted from the polarizing element 43. The cross dichroic prism 50 has a substantially square shape in plan view in which four right angle prisms are bonded. A dielectric multilayer film is formed on the substantially X-shaped interface to which the right-angle prism is bonded. The dielectric multilayer film formed at one of the substantially X-shaped interfaces reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. By these dielectric multilayer films, red light and blue light are bent, and the traveling direction of green light is aligned, so that three color lights are synthesized.

  The color image emitted from the cross dichroic prism 50 is enlarged and projected by the projection optical system 60 to form an image on the screen SCR.

FIG. 3 is a cross-sectional view of the rotating fluorescent plate 30 cut along a plane including the rotation center of the substrate 31. FIG. 4 is a diagram showing the configuration of the rotating fluorescent plate 30 as viewed from the back side of the substrate 31 (the side of the surface where the phosphor layer 32 is not provided).
As shown in FIG. 3, the motor 33 has a main body 33a and a rotating shaft 33b. The back surface 35 of the substrate 31 has a hub 35a, and a rotating shaft 33b of the motor 33 is attached to the substrate 31 through an opening provided in the hub 35a. The hub 35 a constitutes a part of the back surface 35 of the substrate 31. The motor 33 is attached to the substrate 31 with the main body portion 33a in contact with the hub 35a. This prevents backlash between the motor 33 and the substrate 31 when the substrate 31 rotates.

  In the rotating fluorescent plate 30, the rotation balance is adjusted in consideration of eccentricity of the substrate 31 so that a large amount of fluorescent light is incident on the collimating optical system 85. Specifically, in the rotating fluorescent plate 30 according to the present embodiment, the balance adjusting member 110 is disposed on the back surface 35 of the substrate 31. The balance adjusting member 110 is made of, for example, a resin material such as an adhesive, and is directly provided on the back surface 35 of the substrate 31. The balance adjusting member 110 is not limited to a resin material, and for example, a metal member attached with an adhesive may be used. Further, the shape of the balance adjusting member 110 is arbitrary.

  As shown in FIGS. 3 and 4, the back surface 35 of the substrate 31 can be virtually divided into an arrangement area A1 for arranging the balance adjusting member 110 and an irradiation area A2 irradiated with the excitation light EL. . The arrangement region A1 concentrically surrounds the outer peripheral portion of the main body portion 33a of the motor 33 when the substrate 31 is viewed from the back surface 35 side. That is, the arrangement area A1 is a partial area on the back surface 35 (including the hub 35a) of the substrate 31. The balance adjusting members 110 are arranged in the arrangement area A1, and in this embodiment, for example, two balance adjusting members 110 are arranged on the back surface 35 of the substrate 31. Note that the number of balance adjusting members 110 is not limited to this, and one or three or more can be arranged as appropriate according to the rotational balance of the substrate 31. Further, the balance adjusting member 110 may be arranged directly on the hub 35a.

  The irradiation area A2 concentrically surrounds the outer periphery of the arrangement area A1. As described above, the excitation light incident area S moves relative to the substrate 31 around the rotation axis 33b. When the substrate 31 is viewed from the optical axis direction of the excitation light EL, the irradiation region A2 includes the locus of the excitation light incident region S on the substrate 31. That is, the balance adjusting member 110 arranged in the arrangement region A1 is a region different from the region irradiated with the excitation light EL when viewed from the optical axis direction of the excitation light EL. Thereby, it is possible to prevent the occurrence of the problem that the excitation light EL is irradiated on the balance adjusting member 110 and not the phosphor layer 32, and the excitation light EL is efficiently irradiated onto the phosphor layer 32. can do.

  By the way, since the fluorescent light emitted from the phosphor layer 32 emits Lambert light, in order to efficiently capture the fluorescent light by the collimating optical system 85 (first lens 81), the collimating optical system 85 is incorporated into the phosphor layer 32. It is necessary to arrange so as to face each other in a close state. According to the light source device 10A according to the present embodiment, the balance adjusting member 110 is provided not on the front surface 34 of the substrate 31 but on the back surface 35, so that the collimating optical system 85 is disposed on the phosphor layer 32 (the front surface 34 of the substrate 31). It can arrange | position so that it may oppose in the state which adjoined. Specifically, in the present embodiment, the distance d between the phosphor layer 32 and the collimating optical system 85 is set to about 1 mm, for example. Thereby, size reduction of 10 A of light source devices is realizable.

Further, according to the projector 100 according to the present embodiment, the light source device 10A that is reduced in size by being arranged in a state where the collimating optical system 85 and the substrate 31 of the rotating fluorescent plate 30 are close to each other is provided. The projector 100 provided with the device 10A itself can also be reduced in size.
As described above, the projector 100 includes the balance adjusting member 110, so that the rotational balance of the rotary fluorescent plate 30 is adjusted, and the projector 100 is highly reliable.

(Second Embodiment)
Subsequently, a configuration according to a second embodiment of the projector of the invention will be described. The difference between the present embodiment and the first embodiment is the configuration of the light source device, and the other configurations are the same. For this reason, in the following description, the same members and configurations as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.

  FIG. 5 is a schematic diagram showing an optical system of the projector 200 according to the present embodiment. As shown in FIG. 5, the projector 200 according to the present embodiment includes a light source device 110 </ b> A, a color separation light guide optical system 20, a liquid crystal light modulation device 40 </ b> R as a light modulation device, a liquid crystal light modulation device 40 </ b> G, and a liquid crystal light modulation device. The apparatus 40B, the cross dichroic prism 50, and the projection optical system 60 are provided.

  The light source device 110A includes a light source 10, a first condenser lens 55, a collimator lens 56, a rotating fluorescent plate 30, a motor 33, a pickup optical system 94, a dichroic mirror 91, a second condenser lens 90, and a rod integrator. 80 and a collimating lens 70.

  The pickup optical system 94 includes a single lens or a plurality of lenses, for example, a first lens 93 and a second lens 92. The pickup optical system 94 condenses the excitation light EL emitted from the light source 10 on the phosphor layer 32. Further, the fluorescent light emitted from the phosphor layer 32 enters the pickup optical system 94, and makes the incident fluorescent light substantially parallel. The pickup optical system 94 constitutes an optical system in which fluorescent light emitted from the phosphor layer is incident in the present invention.

  The excitation light EL emitted from the light source 10 is once narrowed by the first condenser lens 55 and the collimator lens 56. Thereafter, the optical path is bent by 90 degrees by the dichroic mirror 91 and condensed on the phosphor layer 32 of the rotating fluorescent plate 30 by the pickup optical system 94. In the light source device 110 </ b> A according to the present embodiment, the excitation light EL enters the phosphor layer 32 from the second surface side of the substrate 31, and the fluorescent light emitted from the phosphor layer 32 is the second surface side of the substrate 31. Are emitted toward a pickup optical system 94 provided in

  6A is a cross-sectional view of the rotating fluorescent plate 30 according to the present embodiment cut along a plane including the rotation center of the substrate 31, and FIG. 6B shows the configuration of the phosphor layer 32 in FIG. 6A. It is an enlarged view shown. Also in this embodiment, the surface of the substrate 31 on which the motor 33 is provided is referred to as a back surface 35, and the surface of the substrate 31 facing the back surface 35 is referred to as a front surface 34. The front surface 34 constitutes the second surface of the present invention, and the back surface 35 constitutes the first surface of the present invention.

  As shown in FIGS. 6A and 6B, the substrate 31 according to the present embodiment includes a reflection surface 36 that reflects fluorescent light on the opposite side of the phosphor layer 32 from the pickup optical system 94. Specifically, in the present embodiment, the reflective surface 36 is provided on the surface 34 of the substrate 31, and the phosphor layer 32 is provided on the reflective surface 36.

  The reflecting surface 36 is made of a metal film such as aluminum. Unlike the first embodiment, in this embodiment, since the excitation light EL does not need to pass through the substrate 31, it is not necessary to configure the substrate 31 itself with a transparent member having optical transparency. The substrate 31 according to the present embodiment can be formed using a metal member such as aluminum. As described above, the substrate 31 itself may be formed of a metal member having light reflectivity, and the reflection surface 36 may be formed of the substrate 31.

  Also in the present embodiment, the rotation balance is adjusted in consideration of the eccentricity of the substrate 31 so that a large amount of fluorescent light is incident on the pickup optical system 94. Specifically, in the rotating fluorescent plate 30 according to the present embodiment, the balance adjusting member 110 is disposed on the back surface 35 of the substrate 31.

  In the light source device 110 </ b> A according to the present embodiment, since the excitation light EL is incident on the phosphor layer 32 from the second surface side of the substrate 31, the degree of freedom in arranging the balance adjusting member 110 is high. That is, regardless of the arrangement of the balance adjusting member, the phosphor layer can be efficiently irradiated with excitation light. For example, as illustrated in FIG. 6A, the balance adjusting member 110 can be disposed in a region overlapping the phosphor layer 32 when viewed from the optical axis direction of the excitation light EL. As described above, as long as the balance adjusting member 110 is not in contact with the motor 33, the balance adjusting member 110 can be provided at an arbitrary position on the back surface 35 of the substrate 31 regardless of the excitation light incident area S. Therefore, the rotation balance of the substrate can be adjusted with high accuracy.

  Further, by arranging the balance adjusting member 110 as shown in FIG. 6A, the rotation balance of the substrate 31 can be adjusted with high accuracy while the substrate 31 is downsized.

  As described above, since the fluorescent light emitted from the phosphor layer 32 emits Lambert light, in order to efficiently capture the fluorescent light by the pickup optical system 94 (first lens 93), the pickup optical system 94 is used as the phosphor. It is necessary to dispose it so as to face the layer 32 in a close proximity. According to the light source device 10 </ b> A according to the present embodiment, the balance adjusting member 110 is provided on the back surface 35 instead of the front surface 34 of the substrate 31, so that the pickup optical system 94 is placed on the phosphor layer 32 (the front surface 34 of the substrate 31). It can arrange | position so that it may oppose in the state which adjoined. Specifically, in the present embodiment, the distance d between the phosphor layer 32 and the pickup optical system 94 is set to about 1 mm, for example. Thereby, not only the fluorescent light can be efficiently used, but also the light source device 10A can be downsized.

In addition, since the projector 200 according to the present embodiment includes the light source device 110A that is reduced in size as described above, the projector 200 itself including the light source device 110A itself can also be reduced in size.
As described above, the projector 200 includes the balance adjusting member 110, so that the rotational balance of the rotary fluorescent plate 30 is adjusted, and the projector 200 is highly reliable.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of invention, it can change suitably.

  For example, in the first embodiment and the second embodiment, the case where the motor 33 is attached in contact with the hub 35a of the substrate 31 has been described as an example, but the motor 33 and the hub 35a (the back surface 35 of the substrate 31) are described. ) May be provided between them. In the gap provided in this way, a configuration in which the balance adjusting member 110 is arranged on the hub 35a as shown in FIG. 7 may be adopted. According to this configuration, the balance adjustment member 110 and the motor 33 can be arranged in a state of overlapping each other when viewed from the optical axis direction of the excitation light EL. Therefore, even when a small substrate 31 is employed, a space for arranging the balance adjusting member 110 can be secured so that the balance can be adjusted favorably. Furthermore, as described in the second embodiment, the balance adjustment member 110 and the phosphor layer 32 may be arranged so as to overlap each other when viewed from the optical axis direction of the excitation light EL.

  In the first embodiment, the case where the phosphor layer 32 is provided on the front surface 34 of the substrate 31 has been described as an example. However, the phosphor layer 32 may be provided on the back surface 35 of the substrate 31.

  Further, in the first embodiment and the second embodiment, the phosphor layer 32 including the phosphor particles is provided on the substrate 31, but a substrate in which the phosphor particles are dispersed may be used as the substrate 31.

DESCRIPTION OF SYMBOLS 10 ... Light source, 10A ... Light source device, 30 ... Rotary fluorescent plate, 31 ... Substrate, 32 ... Phosphor layer, 33 ... Motor, 34 ... Front surface, 35 ... Back surface, 35a ... Hub, 36 ... Reflective surface, 85 ... Collimating optical system 94, pickup optical system, 100, 200, projector, 110, balance adjusting member, 110A, light source device

Claims (6)

A substrate having a phosphor;
A driving device provided on the first surface side of the substrate and driving the substrate to rotate about a predetermined rotation axis;
A balance adjusting member for adjusting the balance of the substrate;
In a light source device comprising an optical system on which fluorescent light emitted from the phosphor is incident,
The optical system is provided so as to face a second surface of the substrate facing the first surface,
The light source device, wherein the balance adjusting member is provided on the first surface. An excitation light source that emits excitation light for exciting the phosphor;
The excitation light is applied to the phosphor from the first surface side,
2. The light source according to claim 1, wherein the balance adjusting member is provided in a region different from a region irradiated with the excitation light in the substrate as viewed from an optical axis direction of the excitation light. apparatus. An excitation light source that emits excitation light for exciting the phosphor;
The excitation light is applied to the phosphor from the second surface side,
The light source device according to claim 1, wherein a reflection surface that reflects the fluorescent light is provided between the balance adjusting member and the phosphor.   The light source device according to claim 3, wherein the balance adjusting member is provided in a region overlapping with the phosphor when viewed from the optical axis direction of the excitation light.   The light source device according to claim 1, wherein the balance adjusting member is provided between the substrate and the driving device. A light source device according to any one of claims 1 to 5,
A light modulation element that modulates the fluorescence emitted from the light source device with an image signal;
A projection optical system that projects the fluorescence modulated by the light modulation element.

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