JP2013114840A - Light source device, and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device and a projector, capable of restraining leakage of light with high output to the outside and securing its safety.SOLUTION: The light source device includes: an excitation light source 10 for emitting exciting light; a fluorescent layer 32 for emitting fluorescence by receiving the exciting light emitted from the excitation light source 10; a base 31 for having the fluorescent layer 32; a detection device 60 for detecting whether or not the exciting light emitted from the excitation light source 10 goes through the fluorescent layer 32 and the base 31; and a control device 70 for stopping the exciting light from emitting from the excitation light source 10 when the detection device 60 detects that the exciting light emitted from the excitation light source 10 goes through the fluorescent layer 32 and the base 31.

Description

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

  In recent years, laser light sources have attracted attention as high-efficiency light sources with a wide color gamut for high performance projectors. For example, the projector of Patent Document 1 includes a plurality of light sources that emit laser light as excitation light, and a plurality of phosphor layers arranged on a rotating plate.

JP 2010-85740 A

  The projector of Patent Document 1 is configured to condense laser light emitted from a plurality of light sources onto a phosphor layer formed on a rotating plate. In the case of such a configuration, when the rotating plate stops in a state where the laser light is emitted from the light source, the laser light is collected at one point on the rotating plate. At this time, the portion of the rotating plate where the laser beam is condensed becomes high temperature due to the irradiation energy of the laser beam. For this reason, a portion of the rotating plate where the laser beam is condensed may be melted and a hole may be formed in the rotating plate. In this case, high-power laser light penetrates the rotating plate and leaks to the outside.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a light source device and a projector that can prevent high-output light from leaking to the outside and ensure safety. .

  In order to solve the above problems, a light source device of the present invention includes a light source that emits excitation light, a phosphor layer that emits fluorescence in response to the excitation light emitted from the light source, and the phosphor layer. A detection device that detects whether or not the excitation light emitted from the light source has penetrated the phosphor layer and the substrate; and the excitation light emitted from the light source and the phosphor layer. And a control device that stops emission of the excitation light from the light source when the detection device detects that the substrate has penetrated the substrate.

  According to this configuration, when the excitation light emitted from the light source penetrates the phosphor layer and the substrate, the emission of the excitation light from the light source is stopped. For this reason, even when the portion where the excitation light emitted from the light source is condensed in the substrate melts and a hole is formed in the substrate, it can be avoided that the excitation light continues to leak from the hole in the substrate. . Therefore, it is possible to prevent high-output light from leaking to the outside and ensure safety.

  In the light source device, a shielding member that shields the excitation light penetrating the substrate may be disposed on a side of the substrate opposite to the side on which the phosphor layer is disposed.

  According to this light source device, even when the portion of the substrate where the excitation light emitted from the light source is condensed melts and a hole is formed in the substrate, the excitation light leaking from the hole in the substrate is stopped by the shielding member. be able to. Therefore, it is possible to stop the excitation light from being emitted from the light source before the excitation light leaking from the hole in the base body leaks to the outside.

  The said light source device WHEREIN: The said shielding member may be arrange | positioned in the position away from the surface on the opposite side to the side by which the said fluorescent substance layer of the said base | substrate is arrange | positioned.

  According to this light source device, since the shielding member is disposed at a position away from the substrate, the excitation light leaking from the hole in the substrate is not collected on the shielding member. Further, even when the substrate generates heat due to the excitation light irradiation, the heat of the substrate is not directly transmitted to the shielding member. Therefore, it becomes easy to stop the excitation light leaking from the hole of the base with the shielding member. Further, the melting point of the shielding member can be set lower than the melting point of the base body, and the degree of freedom of design is widened.

  In the light source device, the melting point of the shielding member is preferably higher than the melting point of the base.

  According to this light source device, the shielding member is hardly melted by the irradiation of the excitation light leaking from the hole of the base. Therefore, it becomes easy to stop the excitation light leaking from the hole of the base with the shielding member.

  In the light source device, it is preferable that the shielding member absorbs the excitation light penetrating the base.

  According to this light source device, the excitation light leaking from the hole in the base is absorbed by the shielding member. Therefore, it becomes easy to stop the excitation light leaking from the hole of the base with the shielding member.

  In the light source device, the shielding member may be a part of a housing that houses the phosphor layer and the substrate.

  According to this light source device, the shielding member becomes a part of the casing, and the function of the shielding member is imparted to the casing. Therefore, the apparatus configuration can be simplified.

  The light source device may include a housing that accommodates the phosphor layer, the base, and the shielding member.

  According to this light source device, the excitation light leaking from the hole in the base can be stopped by the shielding member and the casing. That is, even when the shielding member is melted by the excitation light leaking from the hole in the base and the hole is opened in the shielding member, the excitation light leaking from the hole in the shielding member can be stopped by the housing. . For this reason, it is possible to stop the excitation light from being emitted from the light source before the shielding member and the casing are melted by the irradiation of the excitation light leaking from the hole of the base.

  In the light source device, the inner wall surface of the housing may be disposed at a position away from a surface opposite to the side on which the excitation light enters through the base body of the shielding member.

  According to this light source device, the inner wall surface of the housing is disposed at a position away from the shielding member. Therefore, the irradiation spot on the inner wall surface of the casing of the excitation light leaking from the hole generated in the shielding member is larger than the irradiation spot on the shielding member of the excitation light leaking from the hole generated in the base. Further, even when the shielding member generates heat due to the irradiation of excitation light, the heat of the shielding member is not directly transmitted to the casing. Therefore, it becomes easy to stop the excitation light leaking from the hole of the shielding member with the housing.

  In the light source device, the control device may stop emitting the excitation light from the light source before the shielding member is melted by the irradiation of the excitation light penetrating the base.

  According to this light source device, the excitation light is stopped from being emitted from the light source before the shielding member is melted by the irradiation of the excitation light leaking from the hole in the base. Therefore, it is possible to avoid the excitation light leaking from the hole in the base from leaking to the outside.

  In the light source device, the detection device includes a first light amount detection element that detects a light amount of the excitation light that has penetrated the base, and the control device detects the first light amount detection element within a predetermined time. Before the total amount of light energy applied to the shielding member calculated based on the amount of the excitation light reaches the energy for melting the shielding member, the emission of the excitation light from the light source is stopped. Also good.

  According to this light source device, before the total amount of light energy applied to the shielding member calculated based on the amount of excitation light detected by the first light quantity detection element within a predetermined time reaches the energy for melting the shielding member. In addition, the emission of the excitation light from the light source is stopped. Therefore, it is possible to avoid the excitation light leaking from the hole in the base from leaking to the outside.

  In the light source device, the first light amount detection element may detect a light amount of reflected light that penetrates the base and is reflected by the shielding member.

  According to this light source device, since the first light quantity detection element is disposed in the shielding member in an area that does not overlap with the excitation light irradiation area that has penetrated the base body, the excitation light that has penetrated the base body is directly applied to the first light quantity detection element. I won't win. Therefore, even if the excitation light that has penetrated the base is high-power light, the first light quantity detection element receives reflected light that is reflected by the shielding member and has a reduced intensity. Therefore, it is possible to avoid the failure of the first light quantity detection element due to the irradiation of high output light.

  In the light source device, the detection device includes a temperature detection element that detects a temperature of the shielding member, and the temperature detection element is on a side opposite to a side of the shielding member through which the excitation light is incident. The light irradiation position at which the excitation light is irradiated onto the phosphor layer is disposed at a position projected in the traveling direction of the excitation light that has penetrated the substrate, and the control device is configured to detect the temperature. Based on the detection result of the element, emission of the excitation light from the light source may be stopped before the temperature of the shielding member reaches the melting point of the shielding member.

  According to this light source device, emission of excitation light from the light source is stopped before the temperature of the shielding member reaches the melting point of the shielding member, based on the detection result of the temperature detection element. Therefore, it is possible to avoid the excitation light leaking from the hole in the base from leaking to the outside. Further, with such a configuration, the temperature detection element can detect a change in the temperature of the shielding member due to the irradiation of the excitation light penetrating the base with high accuracy. Further, since the temperature detection element is disposed on the side opposite to the side on which the excitation light that penetrates the base of the shielding member is incident, the excitation light that penetrates the base does not directly hit the temperature detection element. Therefore, it is possible to avoid failure of the temperature detecting element due to irradiation with high output light.

  In the light source device, the detection device includes a second light amount detection element that detects a light amount of the fluorescence emitted from the phosphor layer, and the control device is based on a detection result of the second light amount detection element. The excitation light may be stopped from being emitted from the light source when the amount of fluorescent light becomes zero.

  According to this light source device, the emission of excitation light from the light source is stopped when the amount of fluorescent light becomes zero, based on the detection result of the second light amount detection element. For this reason, even when the part which excitation light condenses in a fluorescent substance layer lose | disappears, it can stop emitting excitation light from a light source.

  In the light source device, the substrate may be a rotating plate that rotates about a predetermined rotation axis, and the phosphor layer may be provided along a rotation direction of the substrate.

  According to this light source device, the heat generated in the substrate by the irradiation of the excitation light emitted from the light source can be dissipated in a wide region along the rotation direction of the substrate. For this reason, it can suppress that a base | substrate melt | dissolves by irradiation of the excitation light inject | emitted from the light source.

  In the light source device, the light source may emit laser light as the excitation light.

  According to this light source device, since the light condensing property is high as compared with the case where, for example, a halogen lamp or an ultrahigh pressure mercury lamp is used as the light source, high output light is condensed on the base. At this time, a portion where the laser beam is condensed in the substrate is melted and a hole is easily opened. Therefore, in such a configuration, the effect of the present invention that suppresses leakage of high-output light to the outside and secures safety becomes remarkable.

  The projector according to the present invention includes the light source device described above, a light modulation device that modulates light emitted from the light source device according to image information, and a projection optical system that projects the modulated light from the light modulation device as a projection image. And.

  According to this projector, since the above-described light source device is provided, it is possible to provide a projector capable of preventing safety of high-output light from leaking to the outside and ensuring safety.

It is a schematic diagram which shows the optical system of the projector which concerns on 1st Embodiment of this invention. It is a front view of the light source with which a light source device is provided. It is a schematic diagram which shows a rotation fluorescent plate equally. It is a graph which shows the light emission characteristic of a light source and fluorescent substance similarly. FIG. 6 is a graph showing the relationship between the total amount of light energy applied to the shielding member calculated based on the amount of excitation light detected by the first light amount detection element within a predetermined time and time. It is a flowchart which shows operation | movement of a light source device until it stops emitting excitation light from a light source similarly. It is a schematic diagram which shows the light source device which concerns on 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of a light source device until it stops emitting excitation light from a light source similarly. It is a schematic diagram which shows the light source device which concerns on 3rd Embodiment of this invention. It is a schematic diagram which shows the light source device which concerns on 4th Embodiment of this invention. It is a schematic diagram which shows the light source device which concerns on 5th Embodiment of this invention. It is a flowchart which shows operation | movement of a light source device until it stops emitting excitation light from a light source similarly.

  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, an actual structure and a scale, a number, and the like in each structure are different.

(First embodiment)
FIG. 1 is a schematic diagram showing an optical system of a projector 1000 according to the first embodiment of the present invention.
As shown in FIG. 1, the projector 1000 includes a light source device 1, an illumination optical system 100, a color separation light guide optical system 200, a liquid crystal light modulation device 400R as a light modulation device, a liquid crystal light modulation device 400G, and liquid crystal light. A modulation device 400B, a cross dichroic prism 500, and a projection optical system 600 are provided.

  The light source device 1 includes an excitation light source 10, a collimator lens array 13, a condenser lens 20, a collimating lens 21, a dichroic mirror 22, a pickup optical system 40, a rotating fluorescent plate 30, a shielding member 50, a detection device 60, and a control device 70. It has. On the optical path of the excitation light emitted from the excitation light source 10, a collimator lens array 13, a condenser lens 20, a collimating lens 21, a dichroic mirror 22, a pickup optical system 40, and a rotating fluorescent plate 30 are arranged in this order. .

FIG. 2 is a front view of the excitation light source 10.
As shown in FIG. 2, the excitation light source 10 is a laser light source array in which laser light sources 12 are arranged on a base 11 in a two-dimensional array (5 in total) in a 5 × 5 square shape.

  The excitation light source 10 emits blue (light emission intensity peak: around 445 nm, see FIG. 4A) laser light as excitation light for exciting a fluorescent material included in the rotating fluorescent plate 30 described later. The excitation light source 10 may be an excitation light source that emits colored light having a peak wavelength other than 445 nm as long as it is light having a wavelength that can excite a fluorescent substance to be described later.

  The collimator lens array 13 is configured by arranging a plurality of microlenses 130 provided corresponding to each laser light source 12 in a two-dimensional array of 5 × 5 (a total of 25). The collimator lens array 13 is arranged such that each microlens 130 is on the beam axis of each laser beam emitted from each laser light source 12, and collimates each laser beam.

  The condenser lens 20 is composed of, for example, a convex lens. The condenser lens 20 is disposed on the beam axes of a plurality of laser beams (excitation light) incident from the collimator lens array 13 and converges the excitation light.

  The collimating lens 21 is composed of, for example, a biconcave lens. The collimating lens 21 is disposed between the condensing lens 20 and the focal position of the condensing lens 20 and collimates the excitation light incident from the condensing lens 20.

  The dichroic mirror 22 is disposed so as to face the respective surfaces so that the surface thereof forms an angle of about 45 ° with respect to the light emitting surface of the excitation light source 10 and the surface of the phosphor layer 32. The dichroic mirror 22 bends the excitation light (blue light component) incident from the collimating lens 21 by 90 ° and reflects it to the pickup optical system 40 side, and also makes a red light component and a green light component incident from the pickup optical system 40 described later. Permeate.

  The pickup optical system 40 is disposed on the optical path of light between the dichroic mirror 22 and the rotating fluorescent plate 30. The pickup optical system 40 includes a first lens 41 that suppresses the spread of light from the rotating fluorescent plate 30 and a second lens 42 that collimates the light incident from the first lens 41. The first lens 41 is, for example, a plano-convex lens having a curved surface shape in which the rotating fluorescent plate 30 side is planar and the opposite side is convex, and the second lens 42 is, for example, a convex lens. The pickup optical system 40 causes the light from the rotating fluorescent plate 30 to enter the dichroic mirror 22 in a substantially parallel state. Further, the first lens 41 and the second lens 42 of the pickup optical system 40 also have a function of condensing the excitation light incident from the dichroic mirror 22, and the excitation light is collected on the rotating fluorescent plate 30. Make it incident.

FIG. 3 is a perspective view of the rotating fluorescent plate 30.
A rotating fluorescent plate 30 using a rotating plate as a substrate on which a phosphor layer is provided is a so-called reflection type rotating fluorescent plate. As shown in FIGS. 1 and 3, the rotating fluorescent plate 30 is formed by providing a phosphor layer 32 on a rotating plate 31 that is rotationally driven by a motor 33. The rotating plate 31 corresponds to the base in the present invention. The phosphor layer 32 is provided in a ring shape around the rotation axis O of the rotating plate 31. The phosphor layer 32 includes phosphor particles (not shown) and a binder.

  Excitation light (blue light) collected by the first lens 41 and the second lens 42 enters the rotating fluorescent plate 30 from the surface of the phosphor layer 32. The rotating fluorescent plate 30 emits red light (fluorescence) and green light (fluorescence) emitted from the phosphor layer 32 toward the same side as the side on which the excitation light is incident.

  The rotating fluorescent plate 30 rotates at 7500 rpm when in use. Although not described in detail, the rotating fluorescent plate 30 has a diameter of 50 mm and is configured such that the optical axis of the blue light incident on the phosphor layer 32 is located about 22.5 mm away from the rotational center of the rotating fluorescent plate 30. Has been. That is, the blue light condensing spot moves relative to the rotating plate 31 so as to draw a circle around the rotation axis O at a speed of about 18 m / sec.

  The rotating plate 31 is made of a material that reflects the fluorescence emitted from the phosphor layer 32. In the present embodiment, a disc is used as the rotating plate 31, but the shape is not limited to the disc. As a material of the rotating plate 31, for example, a metal material having a high thermal conductivity such as Al can be used.

  The phosphor layer 32 has phosphor particles that emit fluorescence, absorbs excitation light (blue light), and has a fluorescence of approximately 490 to 750 nm (emission intensity peak: 570 nm, see FIG. 4B). Has a function to convert. 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 excitation light emitted from the excitation light source 10 shown in FIG. 1 and emit fluorescence. For example, the phosphor particles contain a substance that emits fluorescence when excited by blue light having a wavelength of about 445 nm, and a part of the excitation light is converted into light including from the red wavelength band to the green wavelength band. And inject.

As the phosphor particles, a commonly known YAG (yttrium, aluminum, garnet) phosphor layer can be used. For example, a YAG phosphor layer 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.

  As shown in FIG. 1, the light emitted from the rotating fluorescent plate 30 is collimated by the above-described pickup optical system 40 and enters the dichroic mirror 22.

  The dichroic mirror 22 reflects and removes excitation light (blue light) from light incident from the pickup optical system 40, and transmits green light and red light.

  Note that blue light emitted from another light source device (not shown) is incident on the surface of the dichroic mirror 22 opposite to the incident surface on which light from the pickup optical system 40 is incident. Is reflected in a direction parallel to the beam axis.

  The illumination optical system 100 is disposed between the light source device 1 and the color separation light guide optical system 200. The illumination optical system 100 includes a condenser lens 101, a rod integrator 102, and a collimating lens 103.

  The condensing lens 101 consists of a convex lens, for example. The condensing lens 101 is disposed on the light axis of the light incident from the dichroic mirror 22 and condenses this light.

  The light transmitted through the condenser lens 101 enters one end side of the rod integrator 102. The rod integrator 102 is a prismatic optical member extending in the direction of the optical path. The light transmitted through the inside is mixed and the light transmitted through the condenser lens 101 is mixed to make the luminance distribution uniform. To do. The cross-sectional shape orthogonal to the optical path direction of the rod integrator 102 is substantially similar to the outer shape of the image forming region of the liquid crystal light modulation device 400R, the liquid crystal light modulation device 400G, and the liquid crystal light modulation device 400B.

  The light emitted from the other end side of the rod integrator 102 is collimated by the collimating lens 103 and emitted from the light source device 1.

  The color separation light guide optical system 200 includes a dichroic mirror 210, a dichroic mirror 220, a reflection mirror 230, a reflection mirror 240, a reflection mirror 250, and a relay lens 260. The color separation light guide optical system 200 separates light from the light source device 1 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 400R. The liquid crystal light modulation device 400G and the liquid crystal light modulation device 400B have a function of guiding light.

  The dichroic mirror 210 and the dichroic mirror 220 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 210 transmits a blue light component and reflects a red light component and a green light component. The dichroic mirror 220 reflects the green light component and transmits the red light component.

  The reflection mirror 230, the reflection mirror 240, and the reflection mirror 250 are mirrors that reflect incident light. Specifically, the reflection mirror 230 reflects the blue light component transmitted through the dichroic mirror 210. The reflection mirror 240 and the reflection mirror 250 reflect the red light component transmitted through the dichroic mirror 220.

  The blue light transmitted through the dichroic mirror 210 is reflected by the reflection mirror 230 and enters the image forming area of the liquid crystal light modulation device 400B for blue light. The green light reflected by the dichroic mirror 210 is further reflected by the dichroic mirror 220 and enters the image forming area of the liquid crystal light modulation device 400G for green light. The red light transmitted through the dichroic mirror 220 enters the image forming area of the liquid crystal light modulation device 400R for red light through the incident-side reflection mirror 240, the relay lens 260, and the emission-side reflection mirror 250.

  As the liquid crystal light modulation device 400R, the liquid crystal light modulation device 400G, and the liquid crystal light modulation device 400B, commonly known devices can be used. For example, the liquid crystal light modulation device 400G includes the liquid crystal element 410 and the polarizing elements 420 and 430 that sandwich the liquid crystal element 410. The light modulation device such as a transmissive liquid crystal light valve is used. For example, the polarizing elements 420 and 430 have a configuration in which the transmission axes are orthogonal to each other (crossed Nicols arrangement).

  The liquid crystal light modulation device 400R, the liquid crystal light modulation device 400G, and the liquid crystal light modulation device 400B modulate incident color light according to image information to form a color image, and are an illumination target of the light source device 1. The liquid crystal light modulation device 400R, the liquid crystal light modulation device 400G, and the liquid crystal light modulation device 400B perform light modulation of each incident color light.

  For example, the liquid crystal light modulation device 400R, the liquid crystal light modulation device 400G, and the liquid crystal light modulation device 400B are transmissive 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 type of linearly polarized light emitted from the incident side polarizing plate 420 is modulated according to the image information.

  The cross dichroic prism 500 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the emission side polarizing plate 430. The cross dichroic prism 500 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 500 is enlarged and projected by the projection optical system 600 to form an image on the screen SCR.

  By the way, the projector of patent document 1 becomes a structure which condenses the laser beam inject | emitted from several light sources on the fluorescent substance layer formed in the rotating plate. In the case of such a configuration, when the rotating plate stops in a state where the laser light is emitted from the light source, the laser light is collected at one point on the rotating plate. At this time, the portion of the rotating plate where the laser beam is condensed becomes high temperature due to the irradiation energy of the laser beam. For this reason, a portion of the rotating plate where the laser beam is condensed may be melted and a hole may be formed in the rotating plate. In this case, high-power laser light penetrates the rotating plate and leaks to the outside.

  Therefore, in the present embodiment, the detection device 60 that detects whether or not the excitation light emitted from the excitation light source 10 has penetrated the phosphor layer 32 and the rotating plate 31, and the excitation light emitted from the excitation light source 10 includes A configuration including a control device 70 that stops emission of excitation light from the excitation light source 10 when the detection device 60 detects that the phosphor layer 32 and the rotating plate 31 have been penetrated is employed. . Thereby, it is suppressed that the high output light leaks outside.

  The detection device 60 of the present embodiment is a detection element (first light amount detection element) that detects the amount of excitation light that has penetrated the rotating plate 31. As the first light quantity detection element 60, for example, a photodiode is used.

  The first light amount detection element 60 of the present embodiment detects the amount of reflected light that has penetrated the rotating plate 31 and is reflected by the shielding member 50. The first light quantity detection element 60 is disposed in an area that does not overlap the irradiation area of the excitation light that has penetrated the rotating plate 31 in the shielding member 50. With such a configuration, the excitation light penetrating through the rotary plate 31 is not directly incident on the first light quantity detection element 60.

  The shielding member 50 is disposed on the side of the rotating plate 31 opposite to the side on which the phosphor layer 32 is formed. The shielding member 50 is a member that shields the excitation light that has penetrated the rotating plate 31. In the present embodiment, the control device 70 performs control to stop the excitation light from being emitted from the excitation light source 10 before the shielding member 50 is melted by irradiation with the excitation light that has penetrated the rotating plate 31.

  The shielding member 50 of this embodiment is disposed at a position away from the rotating plate 31. More specifically, the rotating plate 31 is disposed at a position away from the surface opposite to the surface on which the phosphor layer 32 is formed. Thereby, the excitation light leaking from the hole opened in the rotating plate 31 is not condensed on the shielding member 50. The size of the irradiation spot of the excitation light leaking from the hole of the rotating plate 31 in the shielding member 50 is larger than the size of the irradiation spot of the excitation light in the phosphor layer 32.

  The shielding member 50 has a size capable of shielding all excitation light leaking from the hole of the rotating plate 31. For example, the size of the shielding member 50 is such that the irradiation spot of the excitation light leaking from the hole of the rotating plate 31 at the position where the shielding member 50 is disposed as viewed from the traveling direction of the excitation light leaking from the hole of the rotating plate 31 It is larger than the size.

  When the size of the shielding member 50 is limited due to layout restrictions, the shielding member 50 is disposed at a position where all of the excitation light leaking from the hole of the rotating plate 31 can be shielded. Here, in FIG. 1, reference sign D is between the surface of the rotating plate 31 opposite to the surface on which the phosphor layer 32 is formed and the surface of the shielding member 50 on which the excitation light penetrating the rotating plate 31 is incident. Distance. For example, the distance D is set at a distance in the range of 5 mm to 10 mm.

  The melting point of the shielding member 50 of this embodiment is higher than the melting point of the rotating plate 31. For example, when a metal material such as aluminum (melting point: 660.32 ° C.) is used as the material for forming the rotating plate 31, the shielding member 50 is zirconia (melting point: 2700 ° C.), alumina (2050 ° C.), silicon carbide (2600 ° C.). ) Etc. are used.

  FIG. 5 is a graph showing the relationship between the total amount of light energy applied to the shielding member 50 calculated based on the light amount of the excitation light detected by the first light amount detection element 60 within a predetermined time and time. In the following description, the total amount of light energy applied to the shielding member 50 calculated based on the amount of excitation light detected by the first light amount detection element 60 within a predetermined time is referred to as the total amount of irradiation light energy.

  In FIG. 5, the horizontal axis represents time, and the vertical axis represents the total amount of irradiation light energy.

  Further, the total amount of irradiation light energy when the time t1 has passed after the excitation light that has penetrated the rotating plate 31 has started to be irradiated to the shielding member 50 is V1, and the excitation light that has penetrated the rotating plate 31 is irradiated to the shielding member 50. Let V2 be the total amount of irradiation light energy when time t2 (t2> t1) has elapsed since the start.

  The total amount of irradiation light energy is an integration obtained by integrating the amount of excitation light detected by the first light amount detection element 60 per unit time (the amount of reflected light that passes through the rotary plate 31 and is reflected by the shielding member 50). Value.

  As described above, the control device 70 performs control to stop the excitation light from being emitted from the excitation light source 10 before the shielding member 50 is melted by irradiation with the excitation light that has penetrated the rotating plate 31. In the present embodiment, the control device 70 performs control to stop the excitation light from being emitted from the excitation light source 10 before the total amount of irradiation light energy reaches the energy for melting the shielding member 50.

  For example, consider a case where the excitation light emitted from the excitation light source 10 penetrates the phosphor layer 32 and the rotating plate 31 and the shielding light 50 is irradiated with the excitation light that has penetrated the rotating plate 31 for a predetermined time. In this case, as shown in FIG. 5, the relationship between the total amount of irradiation light energy and time is proportional. In other words, the total amount of irradiation light energy increases as the time for which the excitation light penetrating the rotating plate 31 irradiates the shielding member 50 becomes longer. The total amount V2 of irradiation light energy is larger than the total amount V1 of irradiation light energy.

  Next, the operation of the light source device 1 until the excitation light is stopped from being emitted from the excitation light source 10 before the shielding member 50 is melted by irradiation with the excitation light penetrating the rotating plate 31 will be described with reference to FIG. I will explain.

  First, the excitation light source 10 is activated (step S1). As a result, excitation light is emitted from the excitation light source 10, and the excitation light is collected on the phosphor layer 32 formed on the rotating plate 31. The portion where the excitation light is condensed moves so as to draw a circle around the rotation axis O by the rotation of the rotating fluorescent plate 30.

  In the case of such a configuration, when the rotating plate 31 stops in a state where the excitation light is emitted from the excitation light source 10, the excitation light is collected at one point on the rotating plate 31. At this time, the portion of the rotating plate 31 where the excitation light is condensed becomes high temperature due to the irradiation energy of the excitation light. For this reason, a portion of the rotating plate 31 where the excitation light is condensed may be melted and a hole may be formed in the rotating plate 31. In this case, the excitation light penetrates through the holed portion of the rotating plate 31. In the present embodiment, the shielding member 50 is disposed on the opposite side of the surface of the rotating plate 31 on which the phosphor layer 32 is formed. Therefore, the excitation light that has penetrated the rotating plate 31 enters the shielding member 50.

  Next, the amount of excitation light that has penetrated the rotating plate 31 is detected (step S2). In the present embodiment, the first light amount detection element 60 detects the amount of reflected light that has penetrated the rotary plate 31 and was reflected by the shielding member 50.

  Next, based on the light amount of the excitation light detected by the first light amount detection element 60 within a predetermined time, the total amount of irradiation light energy irradiated to the shielding member 50 is calculated (step S3). Here, the total amount of irradiation light energy is an integral obtained by integrating the amount of excitation light detected by the first light amount detection element 60 per unit time (the amount of reflected light that passes through the rotating plate 31 and is reflected by the shielding member 50). Represented by value. The calculated total amount of irradiation light energy is input to the control device 70.

  When the calculated total amount of irradiation light energy is input, the control device 70 determines whether or not this is equal to or greater than a threshold value (step S4), and the calculated total amount of irradiation light energy is greater than the threshold value. In this case, a stop signal is output to the excitation light source 10.

Here, the threshold value is a value lower than the energy at which the shielding member 50 melts. This threshold value is set based on data such as the amount of excitation light emitted from the excitation light source 10 per unit time, the irradiation time of the excitation light to the shielding member 50, the melting point of the shielding member 50, and the like. The threshold value is set in consideration of a safety factor and the like. The threshold value is set to a value lower than an energy value at which the shielding member 50 is melted so that the shielding member 50 is not melted by irradiation with excitation light that has penetrated the rotating plate 31. In this embodiment, the threshold value is, for example, 75% of the energy value at which the shielding member 50 melts.
On the other hand, when the calculated total amount of irradiation light energy is equal to or smaller than the threshold value, the process returns to step S3, and the shielding member 50 is based on the light amount of the excitation light detected by the first light amount detection element 60 within a predetermined time. The total amount of the irradiation light energy irradiated to is calculated.

  When a stop signal is input from the control device 70, the emission of the excitation light from the excitation light source 10 stops (step S5).

  According to the light source device 1 of the present embodiment, even when a portion of the rotating plate 31 where the excitation light emitted from the excitation light source 10 is condensed melts and a hole is formed in the rotating plate 31, The excitation light leaking from the hole can be stopped by the shielding member 50. Therefore, it is possible to stop the excitation light from being emitted from the excitation light source 10 before the excitation light leaking from the hole of the rotating plate 31 leaks to the outside.

  Further, according to this configuration, since the shielding member 50 is disposed at a position away from the rotating plate 31, excitation light leaking from the hole of the rotating plate 31 is not collected on the shielding member 50. Further, even when the rotating plate 31 generates heat due to the irradiation of excitation light, the heat of the rotating plate 31 is not directly transmitted to the shielding member 50. Therefore, it becomes easy to stop the excitation light leaking from the hole of the rotating plate 31 with the shielding member 50.

  Further, according to this configuration, since the melting point of the shielding member 50 is higher than the melting point of the rotating plate 31, the shielding member 50 is hardly melted by the irradiation of the excitation light leaking from the hole of the rotating plate 31. Therefore, it becomes easy to stop the excitation light leaking from the hole of the rotating plate 31 with the shielding member 50.

  In this embodiment, since the shielding member 50 is disposed at a position away from the rotating plate 31, the melting point of the shielding member 50 can be set lower than the melting point of the rotating plate 31. Therefore, the degree of freedom of design is expanded.

  Moreover, according to this structure, before the shielding member 50 melt | dissolves by irradiation of the excitation light leaked from the hole of the rotating plate 31, emission of the excitation light from the excitation light source 10 is stopped. Therefore, it is possible to avoid the excitation light leaking from the hole of the rotating plate 31 from leaking to the outside.

  Moreover, according to this structure, before the total amount of irradiation light energy reaches the energy which fuses the shielding member 50, emission of excitation light from the excitation light source 10 is stopped. Therefore, it is possible to avoid the excitation light leaking from the hole of the rotating plate 31 from leaking to the outside.

  In addition, according to this configuration, since the first light quantity detection element 60 is disposed in the shielding member 50 in the region that does not overlap the irradiation region of the excitation light that has penetrated the rotating plate 31, the excitation light that has penetrated the rotating plate 31 has the first One light quantity detection element 60 does not directly hit. Therefore, even if the excitation light that has penetrated the rotating plate 31 is high-power light, the first light amount detection element 60 receives reflected light that is reflected by the shielding member 50 and has a reduced intensity. Therefore, it is possible to avoid the failure of the first light quantity detection element 60 due to the irradiation of high output light.

  Further, according to this configuration, the heat generated in the rotating plate 31 by the irradiation of the excitation light emitted from the excitation light source 10 can be dissipated in a wide region along the rotation direction of the rotating plate 31. For this reason, it can suppress that the rotating plate 31 melt | dissolves by irradiation of the excitation light inject | emitted from the excitation light source 10. FIG.

  In addition, according to this configuration, a laser light source is used as the excitation light source 10, and the light condensing property is high as compared with, for example, a halogen lamp or an ultrahigh pressure mercury lamp. Therefore, high-power light is collected on the rotating plate 31. At this time, the portion of the rotating plate 31 where the laser beam is condensed melts and the hole is easily opened. Therefore, in such a configuration, the effect of the present invention that suppresses leakage of high-output light to the outside and secures safety becomes remarkable.

  According to the projector 1000 of the present embodiment, since the light source device 1 described above is provided, it is possible to provide the projector 1000 that can prevent high-output light from leaking to the outside and ensure safety. .

  In the present embodiment, an example in which the threshold value is 75% of the energy value at which the shielding member 60 melts has been described. However, the present invention is not limited to this. For example, the threshold value may be 0. The total amount of irradiation light energy obtained by the first light quantity detection element 60 depends on the mounting position of the first light quantity detection element 60. Therefore, when the mounting position of the first light quantity detection element 60 varies from product to product, the total amount of irradiation light energy is estimated to be smaller than the true value, and the actual amount of irradiation light energy is melted by the shielding member 50. It may be larger than the energy value. Therefore, if the threshold value is set to 0, even if the mounting position of the first light quantity detection element 60 varies from product to product, the excitation light is emitted from the excitation light source 10 before the shielding member 50 is melted. Can be stopped reliably.

  Further, the control device 70 estimates the time during which the shielding member 50 is melted by the irradiation of the excitation light from the relationship between the total amount of irradiation light energy and the time, and the first light quantity detection element 60 detects the light quantity of the excitation light. It may be determined whether or not the remaining time is equal to or longer than the estimated time. If the detection time is equal to or longer than the estimated time, a stop signal may be output to the excitation light source 10.

  Moreover, in the light source device 1 of this embodiment, the light source which inject | emits a laser beam was used as a light source, However, It is not restricted to this. For example, a light source that emits light other than laser light may be used as the light source.

  Further, in the light source device 1 of the present embodiment, the rotating plate is used as the substrate on which the phosphor layer is provided, but the present invention is not limited to this. For example, a substrate that can vibrate in a direction intersecting the direction in which excitation light is incident may be used as the substrate provided with the phosphor layer. That is, the substrate provided with the phosphor layer only needs to be movable in a direction intersecting the direction in which the excitation light is incident.

  In the light source device 1 of the present embodiment, the rotating plate 31 made of a metal material having a high thermal conductivity such as Al is used as the base for supporting the phosphor layer 32. However, the present invention is not limited to this. A reflective film provided on a transparent rotating plate may be used as the substrate.

  In the projector 1000 of this embodiment, three liquid crystal light modulation devices are used as the liquid crystal light modulation device, but the present invention is not limited to this. The present invention can also be applied to a projector using one, two, four or more liquid crystal light modulation devices.

  In the projector 1000 of the present embodiment, a transmissive projector is used, but the present invention is not limited to this. For example, a reflective projector may be used. Here, “transmission type” means that the light modulation device as the light modulation means is a type that transmits light, such as a transmission type liquid crystal display device. The “reflective type” means that a light modulation device as a light modulation unit, such as a reflection type liquid crystal display device, reflects light. Even when the present invention is applied to a reflective projector, the same effect as that of a transmissive projector can be obtained.

(Second Embodiment)
FIG. 7 is a schematic diagram showing a light source device 2 according to the second embodiment of the present invention.
As shown in FIG. 7, the light source device 2 according to this embodiment includes a fixed fluorescent plate 80 instead of the above-described rotating fluorescent plate 30, and a temperature detecting element instead of the above-described first light amount detecting element 60. This is different from the light source device 1 according to the first embodiment described above in that the shielding member 51 absorbs excitation light that has penetrated the base body 81. Since the other points are the same as the above-described configuration, the same elements as those in FIG.

  The light source device 2 includes an excitation light source 10, a collimator lens array 13, a condensing lens 20, a collimating lens 21, a dichroic mirror 22, a pickup optical system 40, a fluorescent plate 80, a shielding member 51, a detection device 61, and a control device 70. I have.

  The fluorescent plate 80 of this embodiment is a so-called reflection type fixed fluorescent plate. The fluorescent plate 80 is formed by providing a phosphor layer 82 on a substrate 81. The phosphor layer 82 includes phosphor particles and a binder (not shown).

  Excitation light (blue light) collected by the first lens 41 and the second lens 42 enters the fluorescent plate 80 from the surface of the phosphor layer 82. The fluorescent plate 80 emits red light (fluorescence) and green light (fluorescence) emitted from the phosphor layer 82 toward the same side as the side on which the excitation light is incident.

  The base 81 is made of a material that reflects the fluorescence emitted from the phosphor layer 82. As a material of the base 81, for example, a metal material having a high thermal conductivity such as Al can be used.

  The detection device 61 of the present embodiment is a detection element (temperature detection element) that detects the temperature of the shielding member 50 that generates heat by irradiation with excitation light that has penetrated the base 81. As the temperature detection element 61, for example, a thermistor is used.

  In the temperature detection element 61 of the present embodiment, the light irradiation position at which the excitation light is irradiated onto the phosphor layer 82 is projected on the side opposite to the side on which the excitation light penetrating the base 81 of the shielding member 51 is incident. Has been placed. With such a configuration, the excitation light penetrating through the base 81 is not directly incident on the temperature detection element 61. Further, with such a configuration, the temperature detection element 61 can detect a change in the temperature of the shielding member 50 due to the irradiation of the excitation light penetrating the base body 81 with high accuracy.

  The shielding member 51 of the present embodiment has a characteristic of absorbing excitation light that has penetrated through the base body 81. For example, the excitation light absorption characteristic of the shielding member 51 can be obtained by blackening the surface of the shielding member 51. For example, the surface of the shielding member 51 that is treated with black alumite, or the one that applies carbon black as a black pigment can be used.

  The control device 70 performs control to stop emission of excitation light from the excitation light source 10 before the shielding member 51 is melted by irradiation with excitation light that has penetrated the base 81. In the present embodiment, the control device 70 uses the excitation light from the excitation light source 10 before the temperature of the shielding member 50 detected by the temperature detection element 61 reaches the melting point of the shielding member 50 based on the detection result of the temperature detection element 61. Is controlled to stop being injected.

Here, consider a case where excitation light that has penetrated the base 81 is incident on the shielding member 51. In FIG. 7, reference numeral P <b> 1 indicates a light irradiation position where the excitation light is irradiated on the phosphor layer 82 (for example, a condensing position where the excitation light is condensed). Reference numeral P <b> 2 indicates a position where the light irradiation position P <b> 1 is projected in the traveling direction of the excitation light penetrating the base body 81 on the surface of the shielding member 51 on which the excitation light penetrating the base body 81 is incident. Reference numeral P3 indicates a position where the light irradiation position P1 is projected in the traveling direction of the excitation light that has penetrated the base body 81 on the surface opposite to the side on which the excitation light that has penetrated the base body 81 of the shielding member 51 enters. .
In this case, the portion of the shielding member 51 that generates heat at the highest temperature is the portion indicated by reference numeral P2 on the surface of the shielding member 51 on which the excitation light that has penetrated the base body 81 is incident. When the shielding member 51 is melted by the excitation light penetrating the base 81 and a hole is opened, the portion (P3) opposite to the portion (P2) where the shielding member 51 generates heat at the highest temperature is finally melted. I think that. Therefore, the temperature change of the shielding member 50 is increased by disposing the temperature detection element 61 in the portion indicated by reference numeral P3 on the surface opposite to the side on which the excitation light that has penetrated the base 81 of the shielding member 51 is incident. It can be detected with accuracy. Therefore, it is possible to stop the excitation light from being emitted from the excitation light source 10 based on the detection result detected by the temperature detection element 61 before the shielding member 51 is melted and the hole is opened in the shielding member 51.

  Next, the operation of the light source device 2 until the excitation light is stopped from being emitted from the excitation light source 10 before the shielding member 51 is melted by the irradiation of the excitation light that has penetrated the base body 81 will be described with reference to FIG. explain.

  First, the excitation light source 10 is activated (step S11). As a result, excitation light is emitted from the excitation light source 10, and the excitation light is collected on the phosphor layer 82 formed on the substrate 81. In the present embodiment, a fixed fluorescent plate 80 is employed. Therefore, the excitation light is collected at a certain point in the base body 81. Although not shown in FIG. 7, the fluorescent plate 80 is provided with a cooling device for exhausting heat generated in the phosphor layer 82. When the cooling function of the cooling device is lowered, the substrate 81 becomes high temperature due to the irradiation energy of the excitation light. For this reason, the portion of the base 81 where the excitation light is condensed may melt and a hole may be formed in the base 81. In this case, the excitation light penetrates the base 81. In the present embodiment, the shielding member 51 is disposed on the opposite side of the surface of the substrate 81 on which the phosphor layer 82 is formed. Therefore, the excitation light that has penetrated the base 81 enters the shielding member 51.

  Next, the temperature of the shielding member 51 that has generated heat due to the irradiation of the excitation light penetrating the base 81 is detected (step S12). In the present embodiment, the temperature detection element 61 detects the temperature of the portion indicated by reference numeral P3 on the surface of the shielding member 51 opposite to the side on which the excitation light that has penetrated the base body 81 is incident. The detected temperature data of the shielding member 51 is input to the control device 70.

  When the detected temperature data is input, the control device 70 determines whether or not the detected temperature data is equal to or higher than the threshold value (step S13). If the detected temperature is equal to or higher than the threshold value, the excitation light source is determined. 10 outputs a stop signal.

Here, the threshold value is set based on the melting point of the shielding member 51 and is lower than the melting point of the shielding member 51. The threshold value is set in consideration of a safety factor and the like. The threshold value is set to a value lower than the melting point of the shielding member 51 so that the shielding member 51 is not melted by the irradiation of the excitation light that has penetrated the base 81 and a hole is not opened.
On the other hand, when the detected temperature is lower than the threshold value, the process returns to step S12, and the temperature of the shielding member 51 that has generated heat due to the irradiation of the excitation light that has penetrated the base body 81 is detected.

  When a stop signal is input from the control device 70, the emission of the excitation light from the excitation light source 10 stops (step S14).

  According to the light source device 2 of the present embodiment, the excitation light leaking from the hole of the base body 81 is absorbed by the shielding member 51. Therefore, it becomes easy to stop the excitation light leaking from the hole of the base body 81 with the shielding member 81.

  Further, according to this configuration, the excitation light is not emitted from the excitation light source 10 before the temperature of the shielding member 51 reaches the melting point of the shielding member 51 based on the detection result of the temperature detection element 61. . Therefore, it is possible to avoid the excitation light leaking from the hole of the base body 81 from leaking to the outside. Further, since the temperature detection element 61 is disposed on the opposite side of the shielding member 51 from the side where the excitation light that has penetrated the base 81 is incident, the excitation light that has penetrated the base 81 does not directly hit the temperature detection element 61. Therefore, it is possible to avoid failure of the temperature detection element 61 due to irradiation with high-output light.

(Third embodiment)
FIG. 9 is a schematic diagram showing a light source device 3 according to the third embodiment of the present invention.
As shown in FIG. 9, the light source device 3 according to the present embodiment is different from the light source device 1 according to the first embodiment described above in that it includes a housing 90 that houses the light source device according to the first embodiment described above. ing. Since the other points are the same as the above-described configuration, the same elements as those in FIG.

  The light source device 3 includes an excitation light source 10, a collimator lens array 13, a condenser lens 20, a collimating lens 21, a dichroic mirror 22, a pickup optical system 40, a rotating fluorescent plate 30, a shielding member 50, a detection device 60, a control device 70, and A housing 90 is provided.

  The housing 90 includes an excitation light source 10, a collimator lens array 13, a condenser lens 20, a collimating lens 21, a dichroic mirror 22, a pickup optical system 40, a rotating fluorescent plate 30, a shielding member 50, a detection device 60, and a control device 70. It is a box-shaped member which accommodates.

  The casing 90 here is the excitation light source 10, the collimator lens array 13, the condenser lens 20, the collimating lens 21, the dichroic mirror 22, the pickup optical system 40, the rotating fluorescent plate 30, the shielding member 50, and the detection device 60. And a member arranged so as to surround the control device 70. For example, when a metal fitting is provided on a part of the housing 90 or a protrusion is formed on the housing 90 so as to partition each component, the metal fitting and the protrusion are part of the housing 90. include.

  The inner wall surface 90 a of the housing 90 is disposed at a position away from the surface opposite to the side on which the excitation light that has penetrated the rotating plate 31 of the shielding member 50 is incident.

  According to the light source device 3 of the present embodiment, the excitation light leaking from the hole of the rotating plate 31 can be stopped by the shielding member 50 and the housing 90. That is, even when the shielding member 50 is melted by the irradiation of the excitation light leaking from the hole of the rotating plate 31 and the hole is opened in the shielding member 50, the excitation light leaking from the hole of the shielding member 50 is stored in the housing. You can stop at 90. For this reason, it is possible to stop the excitation light from being emitted from the excitation light source 10 before the shielding member 50 and the housing 90 are melted by the irradiation of the excitation light leaking from the hole of the rotating plate 31.

  Further, according to this configuration, the inner wall surface 90 a of the housing 90 is arranged at a position away from the shielding member 50. Therefore, the irradiation spot on the inner wall surface 90 a of the casing 90 of the excitation light leaking from the hole generated in the shielding member 50 is more than the irradiation spot on the shielding member 50 of the excitation light leaking from the hole generated in the rotating plate 31. growing. Even when the shielding member 50 generates heat due to the irradiation of excitation light, the heat of the shielding member 50 is not directly transmitted to the housing 90. Therefore, it becomes easy to stop the excitation light leaking from the hole of the shielding member 50 with the housing 90.

(Fourth embodiment)
FIG. 10 is a schematic diagram showing a light source device 4 according to the fourth embodiment of the present invention.
As shown in FIG. 10, the light source device 4 according to the present embodiment is the same as the first embodiment described above in that a part of the housing 91 is used instead of the shielding member 50 according to the first embodiment. It differs from the light source device 1 which concerns. Since the other points are the same as the above-described configuration, the same elements as those in FIG.

  The light source device 4 includes an excitation light source 10, a collimator lens array 13, a condenser lens 20, a collimating lens 21, a dichroic mirror 22, a pickup optical system 40, a rotating fluorescent plate 30, a detection device 60, a control device 70, and a housing 91. I have.

  The housing 91 accommodates the excitation light source 10, the collimator lens array 13, the condensing lens 20, the collimating lens 21, the dichroic mirror 22, the pickup optical system 40, the rotating fluorescent plate 30, the detection device 60, and the control device 70. It is a mold member.

  The casing 91 here is the excitation light source 10, the collimator lens array 13, the condenser lens 20, the collimating lens 21, the dichroic mirror 22, the pickup optical system 40, the rotating fluorescent plate 30, the detection device 60, and the control device. A member arranged so as to surround 70 is also included. For example, when a metal fitting is provided on a part of the housing 91 or a protrusion is formed on the housing 91 so as to partition each component, the metal fitting and the protrusion are part of the housing 91. include.

  In the present embodiment, a part of the casing 91 is configured to function as a shielding member. That is, the housing 91 is a member that houses the components of the light source device 4 and shields the excitation light that has penetrated the rotating plate 31. The first light quantity detection element 60 is arranged in a region that does not overlap with the excitation light irradiation region that has penetrated the rotating plate 31 in a part of the housing 91. With such a configuration, the excitation light penetrating through the rotary plate 31 is not directly incident on the first light quantity detection element 60.

  In the present embodiment, the control device 70 performs control to stop emission of excitation light from the excitation light source 10 before a part of the casing 91 is melted by irradiation with excitation light that has penetrated the rotating plate 31. .

  A part of the housing 91 of the present embodiment is disposed at a position away from the surface of the rotating plate 31 opposite to the surface on which the phosphor layer 32 is formed. Thereby, the excitation light leaking from the hole of the rotating plate 31 is not condensed on a part of the casing 91. That is, the size of the excitation light irradiation spot leaking from the hole of the rotating plate 31 in a part of the casing 91 is larger than the size of the excitation light irradiation spot in the phosphor layer 32.

  When the material for forming the housing 91 is restricted due to product weight restrictions, ceramics having a melting point higher than the melting point of the rotating plate 31 is used for only a part of the housing 91, and other parts of the housing 91 are used. A material with a small specific gravity can be used for this part.

  According to the light source device 4 of the present embodiment, the shielding member becomes a part of the casing 91, and the function of the shielding member is given to the casing 91. Therefore, the apparatus configuration can be simplified.

(Fifth embodiment)
FIG. 11 is a schematic diagram showing a light source device 5 according to the fifth embodiment of the present invention.
As shown in FIG. 11, the light source device 5 according to the present embodiment uses the second light quantity detection element 62 instead of the first light quantity detection element 60 according to the first embodiment described above. This is different from the light source device 1 according to the embodiment. Since the other points are the same as the above-described configuration, the same elements as those in FIG.

  The light source device 5 includes an excitation light source 10, a collimator lens array 13, a condenser lens 20, a collimating lens 21, a dichroic mirror 22, a pickup optical system 40, a rotating fluorescent plate 30, a shielding member 50, a detection device 62, and a control device 70. It has.

  The detection device 62 of the present embodiment is a detection element (second light amount detection element) that detects the amount of fluorescence emitted from the phosphor layer 32. For example, a photodiode is used as the second light quantity detection element 62.

  The second light quantity detection element 62 of the present embodiment is disposed in the vicinity of the fluorescent light beam bundle on the side where the fluorescence emitted from the phosphor layer 32 of the dichroic mirror 22 is emitted. With such a configuration, the fluorescence emitted from the dichroic mirror 22 is not directly incident on the second light quantity detection element 62. The second light quantity detection element 62 detects fluorescent stray light emitted from the dichroic mirror 22.

  The control device 70 performs control to stop emission of excitation light from the excitation light source 10 before the shielding member 50 is melted by irradiation with excitation light that has penetrated the rotating plate 31. In the present embodiment, the control device 70 generates excitation light from the excitation light source 10 when the amount of fluorescent light detected by the second light amount detection element 62 becomes zero based on the detection result of the second light amount detection element 62. Control to stop being injected.

  Next, FIG. 12 is used for the operation of the light source device 5 until the excitation light is stopped from being emitted from the excitation light source 10 before the shielding member 50 is melted by the irradiation of the excitation light penetrating the rotating plate 31. I will explain.

  First, the excitation light source 10 is activated (step S21). As a result, excitation light is emitted from the excitation light source 10, and the excitation light is collected on the phosphor layer 32 formed on the rotating plate 31. The portion where the excitation light is condensed moves so as to draw a circle around the rotation axis O by the rotation of the rotating fluorescent plate 30.

  Next, the amount of fluorescence emitted from the phosphor layer 32 is detected (step S22). In the present embodiment, the second light amount detection element 62 detects the amount of fluorescent stray light emitted from the dichroic mirror 22. The detected amount of fluorescence is input to the control device 70.

  By the way, in the case of such a configuration, when the rotating fluorescent plate 30 is stopped in a state where the excitation light is emitted from the light source, the excitation light is collected at one point on the phosphor layer 32. At this time, the portion where the excitation light is condensed in the phosphor layer 32 is heated by the irradiation energy of the excitation light. Therefore, the portion where the excitation light is condensed in the phosphor layer 32 may disappear. In this case, no fluorescence is emitted from the portion of the rotating fluorescent plate 30 where the phosphor layer 32 disappears.

When the amount of fluorescent light is no longer input from the state in which the detected amount of fluorescent light is input, the control device 70, that is, the amount of fluorescent light detected by the second light amount detecting element 62 has changed from a value greater than zero to zero. Sometimes (step S23), a stop signal is output to the excitation light source 10.
On the other hand, if the amount of fluorescent light detected by the second light amount detecting element 62 is not zero, the process returns to step S22, and the amount of fluorescent light emitted from the phosphor layer 32 is detected.

  When the stop signal is input from the control device 70, the emission of the excitation light from the excitation light source 10 is stopped (step S24).

  According to the light source device 5 of the present embodiment, emission of excitation light from the excitation light source 10 is stopped when the amount of fluorescent light becomes 0, based on the detection result of the second light amount detection element 62. . For this reason, even when the part which the excitation light condenses in the fluorescent substance layer 32 has disappeared, the emission of the excitation light from the excitation light source 10 can be stopped.

  In the present embodiment, the second light quantity detection element 62 has been described by giving an example in which the second light amount detection element 62 is disposed in the vicinity of the fluorescent light bundle on the side where the fluorescence emitted from the phosphor layer 32 of the dichroic mirror 22 is emitted. However, it is not limited to this. For example, the second light quantity detection element 62 may be disposed in the vicinity of the fluorescent light beam passing through the pickup optical system 40. That is, the second light quantity detection element 62 only needs to be disposed at a position where it can be detected whether or not fluorescence is emitted from the phosphor layer 32.

  Further, the second light quantity detection element 62 has a polarized beam splitter (hereinafter abbreviated as PBS) disposed on a part of the dichroic mirror 22 on the side where the fluorescence emitted from the phosphor layer 32 is emitted. A part of the fluorescence reflected by the PBS may be detected.

  In the above embodiment, the inspection apparatus has been described by taking as an example a configuration including any one of the first light quantity detection element 60, the temperature detection element 61, and the second light quantity detection element 62. Not exclusively. For example, a configuration including all of the first light quantity detection element 60, the temperature detection element 61, and the second light quantity detection element 62 may be employed as the inspection apparatus. In other words, the inspection apparatus may be configured to include at least one of the first light quantity detection element 60, the temperature detection element 61, and the second light quantity detection element 62.

  The present invention is applicable not only when applied to a front projection type projector that projects from the side that observes the projected image, but also when applied to a rear projection type projector that projects from the side opposite to the side that observes the projected image. can do.

  In each of the above-described embodiments, the example in which the light source device of the present invention is applied to a projector has been described. For example, the light source device of the present invention can be applied to other optical devices (for example, an optical disc device, a car headlamp, a lighting device, etc.).

DESCRIPTION OF SYMBOLS 1, 2, 3, 4, 5 ... Light source device, 10 ... Excitation light source (light source), 31 ... Rotating plate, 32 ... Phosphor layer, 50, 51 ... Shield member, 60 ... 1st light quantity detection element (detection device) , 61 ... temperature detection element (detection device), 62 ... second light quantity detection element (detection device), 70 ... control device, 81 ... substrate, 82 ... phosphor layer, 90, 91 ... housing, 200 ... color separation guide Optical optical system, 400R, 400G, 400B ... Liquid crystal light modulation device (light modulation device), 600 ... Projection optical system, 1000 ... Projector

Claims (16)

A light source that emits excitation light;
A phosphor layer that emits fluorescence in response to the excitation light emitted from the light source;
A substrate provided with the phosphor layer;
A detection device that detects whether or not the excitation light emitted from the light source has penetrated the phosphor layer and the substrate;
A control device that stops emission of the excitation light from the light source when the detection device detects that the excitation light emitted from the light source has penetrated the phosphor layer and the substrate;
A light source device comprising:   2. The light source device according to claim 1, wherein a shielding member that shields the excitation light penetrating through the substrate is disposed on a side of the substrate opposite to the side on which the phosphor layer is disposed. .   The light source device according to claim 2, wherein the shielding member is disposed at a position away from a surface of the base opposite to the surface on which the phosphor layer is disposed.   The light source device according to claim 2, wherein a melting point of the shielding member is higher than a melting point of the base.   5. The light source device according to claim 2, wherein the shielding member absorbs the excitation light that has penetrated the base body. 6.   The light source device according to claim 2, wherein the shielding member is a part of a housing that accommodates the phosphor layer and the base body.   The light source device according to claim 2, further comprising a housing that accommodates the phosphor layer, the base, and the shielding member.   The inner wall surface of the casing is disposed at a position away from a surface opposite to the side on which the excitation light that has penetrated the base body of the shielding member is incident. Light source device.   The control device according to claim 2, wherein the excitation light is stopped from being emitted from the light source before the shielding member is melted by irradiation with the excitation light that has penetrated the base body. The light source device according to any one of the above. The detection device includes a first light amount detection element that detects a light amount of the excitation light that has penetrated the base,
In the control device, the total amount of light energy applied to the shielding member, which is calculated based on the light amount of the excitation light detected by the first light amount detection element within a predetermined time, is energy that melts the shielding member. The light source device according to claim 9, wherein the excitation light is stopped from being emitted from the light source before reaching the light source device.   The light source device according to claim 10, wherein the first light amount detection element detects a light amount of reflected light that penetrates the base and is reflected by the shielding member. The detection device includes a temperature detection element that detects the temperature of the shielding member,
The temperature detecting element is on the opposite side of the shielding member from the side on which the excitation light that has penetrated through the base, and the light irradiation position at which the excitation light is irradiated on the phosphor layer penetrates the base. It is arranged at a position projected in the traveling direction of the excitation light,
The control device stops emission of the excitation light from the light source before the temperature of the shielding member reaches the melting point of the shielding member based on a detection result of the temperature detection element. The light source device according to any one of claims 9 to 11. The detection device includes a second light amount detection element that detects the amount of the fluorescence emitted from the phosphor layer,
The said control apparatus stops emitting the said excitation light from the said light source, when the light quantity of the said fluorescence becomes 0 based on the detection result of the said 2nd light quantity detection element. Item 13. The light source device according to any one of Items 2 to 12. The base is a rotating plate that rotates around a predetermined rotation axis;
The light source device according to claim 1, wherein the phosphor layer is provided along a rotation direction of the base body.   The light source device according to claim 1, wherein the light source emits laser light as the excitation light. The light source device according to any one of claims 1 to 15,
A light modulation device that modulates light emitted from the light source device according to image information;
A projection optical system that projects modulated light from the light modulation device as a projection image;
A projector comprising:

Images