JP2017208288A - Light source device and projector - Google Patents

Abstract

Provided is a light source device that is excellent in reliability by suppressing breakage and dropout of a translucent member.
A light source device includes a substrate having a first surface, a plurality of light emitting elements provided on the first surface of the substrate, including a first light emitting element and a second light emitting element, and a substrate. Frame 3 provided to surround the plurality of light emitting elements on the first surface 2a side of the substrate 2, and support provided between the first light emitting element and the second light emitting element on the first surface 2a side of the substrate 2 And a plurality of translucent members 4 provided on the side opposite to the frame 3 and the substrate 2 of the support member.
[Selection] Figure 1

Description

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

  When a light emitting element such as a semiconductor laser or a light emitting diode is attached with a foreign substance such as an organic substance or moisture, the light emitting element may be damaged during light emission or the performance may be reduced. Therefore, the light source device including these light emitting elements is provided with a sealing structure that blocks the light emitting elements from the outside air. As a sealing structure, for example, Patent Document 1 below discloses a light source device in which a light emitting element is accommodated in a space surrounded by a metal substrate and a glass lid. In recent years, with the miniaturization of light source devices, light source devices having a structure in which a plurality of light emitting elements are mounted on a substrate at high density have been studied.

JP 2015-45843 A

  In the light source device of Patent Document 1, a metal substrate having a high thermal conductivity is used in order to easily release heat generated from the light emitting element to the outside. When a plurality of light emitting elements are mounted on one surface of a metal substrate, the substrate may be deformed such as warpage. If a transparent member such as glass is bonded to the substrate that has been deformed and sealing is performed, the transparent member may be damaged or dropped, and airtightness may not be ensured. Alternatively, even in the sealed light source device, the translucent member is damaged or dropped due to the temperature change of the light source device due to the difference in linear expansion coefficient between the substrate and the translucent member, and the airtightness is increased. In some cases, it could not be secured.

  One aspect of the present invention has been made to solve the above-described problem, and an object of the present invention is to provide a light source device that is excellent in reliability by suppressing breakage or dropout of a translucent member. I will. Another object of one embodiment of the present invention is to provide a projector having excellent reliability by including the light source device described above.

  In order to achieve the above object, a light source device according to one aspect of the present invention includes a substrate having a first surface, a first light emitting element and a second light emitting element provided on the first surface side of the substrate. A plurality of light emitting elements including a frame provided around the plurality of light emitting elements on the first surface side of the substrate, and the first light emitting element and the second on the first surface side of the substrate. And a plurality of translucent members provided on the opposite side of the frame and the support member from the substrate.

  Since the light source device according to one aspect of the present invention includes a plurality of light transmissive members provided on the opposite side of the frame and the support member, the whole is sealed with one light transmissive member. Compared with the conventional light source device, the stress generated per one light transmissive member can be suppressed to be small, and the light transmissive member can be prevented from being damaged or dropped off due to deformation of the substrate or temperature change. Thereby, the reliability of the light source device can be ensured.

  In the light source device according to one aspect of the present invention, the plurality of translucent members include a first translucent member that transmits light emitted from the first light emitting element, and the second light emitting element. A second translucent member that transmits the emitted light.

  In this configuration, a first light transmissive member is provided corresponding to the first light emitting element, and a second light transmissive member is provided corresponding to the second light emitting element. Thereby, each translucent member can be made into the magnitude | size according to a light emitting element, and the failure | damage and drop-off | omission of a translucent member can be suppressed.

  In the light source device according to one aspect of the present invention, the plurality of light emitting elements are arranged so that light emission directions from the respective light emitting elements face substantially the same direction when viewed from the normal direction of the first surface, The first light emitting element and the second light emitting element are arranged side by side in the emission direction, and the plurality of light emitting elements intersect the emission direction as seen from the normal direction of the first surface. A third light emitting element arranged in parallel with the first light emitting element in a direction, and a fourth light emitting element arranged in parallel with the second light emitting element in a direction crossing the emission direction. The first light-transmitting member transmits light emitted from the first light-emitting element and light emitted from the third light-emitting element, and the second light-transmitting member includes: Transmits light emitted from the second light emitting element and light emitted from the fourth light emitting element It may be configured to.

  In this configuration, the first light-transmissive member is provided corresponding to the first light-emitting element and the third light-emitting element arranged in the direction intersecting the light emission direction, and the first light-emitting element is provided in the direction intersecting the light emission direction. A second translucent member is provided corresponding to the second light emitting element and the fourth light emitting element arranged side by side. Therefore, compared with the case where one light-transmitting member is provided for one light-emitting element, it is possible to reduce the number of light-transmitting members to be used and suppress the breakage or dropping of the light-transmitting member. .

  In the light source device according to one aspect of the present invention, each of the plurality of light emitting elements emits light in a direction substantially parallel to the first surface of the substrate, and is emitted from each of the plurality of light emitting elements. A prism having a light reflecting surface for reflecting light toward a direction substantially orthogonal to the first surface of the substrate may be provided.

  In this configuration, of the plurality of surfaces of the light emitting element, the light emission surface is provided substantially orthogonal to the first surface of the substrate, and the surface orthogonal to the light emission surface is substantially parallel to the first surface of the substrate. When, for example, an edge emitting semiconductor laser or the like is used as the light emitting element, the area of the surface orthogonal to the light emitting surface (end surface) is larger than the area of the light emitting surface. Therefore, according to the above configuration, since the surface having a relatively large area faces the first surface of the substrate, the heat of the light emitting element can be efficiently released to the substrate. Further, a plurality of lights from the plurality of light emitting elements can be emitted by the prism in a direction substantially orthogonal to the first surface of the substrate, that is, a direction toward the translucent member.

  In the light source device according to one aspect of the present invention, at least one of the plurality of translucent members may include the prism.

  In this configuration, since at least one translucent member is an integral component of the prism, the number of parts of the light source device can be reduced, and the alignment of the translucent member and the prism with respect to the light emitting element can be performed simultaneously. it can.

  The light source device according to one aspect of the present invention includes an accommodation space surrounded by the substrate, the frame, the support member, and the plurality of translucent members, and the accommodation space is in a decompressed state. Alternatively, it may be filled with an inert gas or dry air.

  According to this configuration, it is possible to reduce the adhesion of foreign substances such as organic substances and moisture to the light emitting element, as compared with a case where the accommodation space is not in a reduced pressure state or is not filled with an inert gas or dry air. . Thereby, the reliability of a light source device can be improved.

  A projector according to one aspect of the present invention includes a light source device according to one aspect of the present invention, a light modulation device that modulates light emitted from the light source device, and a projection that projects light modulated by the light modulation device. An optical system.

  Since the projector according to one aspect of the present invention includes the light source device according to one aspect of the present invention, an image with desired brightness can be obtained, and a projector with excellent reliability can be realized.

  The projector according to one aspect of the present invention may further include a wavelength conversion element that is excited by the light and emits fluorescent light.

  According to this configuration, it is possible to select a wavelength conversion element that emits fluorescent light having an arbitrary wavelength according to the application of the projector. Thereby, the projector of one aspect of the present invention can display an image of a desired color.

It is a perspective view of the light source device of 1st Embodiment. It is a top view of the light source device of 1st Embodiment. It is sectional drawing of the light source device which follows the II-II line | wire of FIG. It is a perspective view of the light source device of 2nd Embodiment. It is a top view of the light source device of 2nd Embodiment. It is sectional drawing of the light source device of 3rd Embodiment. It is a schematic block diagram of the projector of one Embodiment.

[First Embodiment: Light Source Device]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
Note that, in the drawings used in the following description, in order to make each component easy to see, the dimensional scale may be changed depending on the component.

FIG. 1 is a perspective view of the light source device of the first embodiment. FIG. 2 is a plan view of the light source device. 3 is a cross-sectional view of the light source device taken along line II-II in FIG.
As shown in FIGS. 1 to 3, the light source device 1 includes a substrate 2, a plurality of submounts 7, a plurality of light emitting elements 5, a plurality of prisms 8, a frame 3, a support member 9, and a plurality of members. A translucent member 4 and a plurality of electrodes 6 are provided. In the light source device 1, an accommodation space S surrounded by the substrate 2, the frame 3, the support member 9, and the plurality of translucent members 4 and blocked from the external space is provided on the first surface 2 a side of the substrate 2. Yes. The plurality of light emitting elements 5 are housed in a sealed housing space S. That is, the light source device 1 of the present embodiment has a form in which a plurality of light emitting elements 5 are accommodated in one common package.

The board | substrate 2 is a plate-shaped member which has the 1st surface 2a and the 2nd surface 2b on the opposite side to the 1st surface 2a. The substrate 2 has a quadrangular shape such as a substantially square or a substantially rectangular shape when viewed from the normal direction of the first surface 2a. A plurality of light emitting elements 5 are provided on the first surface 2 a of the substrate 2 via a plurality of submounts 7 described later. On the second surface 2b of the substrate 2, a heat radiator (not shown) for releasing heat generated from the plurality of light emitting elements 5 at the time of light emission is appropriately provided. Therefore, the board | substrate 2 is comprised with the metal material with high heat conductivity. As this kind of metal material, copper, aluminum and the like are preferably used, and copper is particularly preferably used.
Hereinafter, when simply referred to as “plan view”, it means a plan view when viewed from the normal direction of the first surface 2 a of the substrate 2.

  As shown in FIG. 2, the plurality of submounts 7 are provided on the first surface 2 a of the substrate 2 at predetermined intervals in two orthogonal directions (X direction and Y direction). Each of the plurality of submounts 7 is provided corresponding to each of the plurality of light emitting elements 5. The dimensions of the submount 7 in the X direction and the Y direction are larger than the dimensions of the light emitting element 5 in the X direction and the Y direction. The submount 7 is made of a ceramic material such as aluminum nitride or alumina. The submount 7 is interposed between the substrate 2 and the light emitting element 5, and relieves stress caused by the difference in linear expansion coefficient between the substrate 2 and the light emitting element 5. The submount 7 is bonded to the substrate 2 by a bonding material such as silver solder or gold-tin solder.

The light emitting element 5 is configured by a solid light source such as a semiconductor laser or a light emitting diode. The light emitting element 5 may be a light emitting element having an arbitrary wavelength according to the use of the light source device 1. In the present embodiment, as the light-emitting element 5 that emits blue light having a wavelength of 430 nm to 490 nm for phosphor excitation, for example, a nitride-based semiconductor (In _X Al _Y Ga _1-XY N, 0 ≦ X ≦ 1, 0 An edge-emitting semiconductor laser constituted by ≦ Y ≦ 1, X + Y ≦ 1) is used. Further, in addition to the above general formula, a group III element partially substituted with a boron atom, a group V element partially substituted with a phosphorus atom or an arsenic atom, etc. may be included. .

  As shown in FIG. 2, the plurality of light emitting elements 5 have a configuration in which, for example, (m × n) (m, n: a natural number of 2 or more) semiconductor lasers are arranged in a grid of m rows and n columns. In the present embodiment, as the plurality of light emitting elements 5, for example, nine semiconductor lasers are arranged in a grid of 3 rows and 3 columns. As shown in FIG. 3, the light emitting element 5 has a bottom surface 5 b that faces the direction in which the light emission surface 5 a is orthogonal to the first surface 2 a of the substrate 2 and is orthogonal to the light emission surface 5 a among the plurality of surfaces of the light emitting element 5. Is arranged on the submount 7 so as to face a direction substantially parallel to the first surface 2a of the substrate 2. With this arrangement, each of the plurality of light emitting elements 5 emits light in a direction substantially parallel to the first surface 2 a of the substrate 2. The plurality of light emitting elements 5 are arranged such that light emission directions from the respective light emitting elements are substantially the same in a plan view. Further, the light emitting element 5 is disposed on the submount 7 so that the light emitting surface 5a is substantially flush with one end surface 7a of the submount 7. The light emitting element 5 is joined to the submount 7 by a joining material (not shown) such as silver solder or gold-tin solder.

  Hereinafter, for convenience of explanation, the light emitting element 5 located in the first row and the first column (uppermost left end) among the nine light emitting elements 5 in the plan view shown in FIG. 2 is referred to as a first light emitting element 51. The light emitting element 5 positioned in the first row and the second column (second from the left in the uppermost stage) arranged side by side with the one light emitting element 51 is referred to as a second light emitting element 52. In addition, the light emitting element 5 located in the second row and first column (the left end of the second stage from the top) arranged side by side with the first light emitting element 51 in the direction orthogonal to the light emission direction (Y direction) is the third. In the second row and the second column (second from the left in the second row from the top) arranged side by side with the second light emitting element 52 in the direction (Y direction) orthogonal to the light emission direction. The positioned light emitting element 5 is referred to as a fourth light emitting element 54.

  As shown in FIGS. 2 and 3, each of the plurality of prisms 8 is provided corresponding to each of the plurality of light emitting elements 5. The prism 8 is provided on the optical path of the light L emitted from the light emitting element 5 corresponding to the prism 8. The prism 8 has a substantially triangular cross section cut along a plane (XZ plane) parallel to the light emission direction and perpendicular to the first surface 2 a of the substrate 2. The prism 8 has a reflecting surface 8 a that reflects the light L emitted from each of the plurality of light emitting elements 5 in a direction substantially orthogonal to the first surface 2 a of the substrate 2. The reflective surface 8a is inclined with respect to the first surface 2a of the substrate 2, and an angle θ formed by the reflective surface 8a and the first surface 2a of the substrate 2 is, for example, 45 °.

  The frame 3 is provided on the first surface 2 a side of the substrate 2 so as to surround the plurality of light emitting elements 5. The frame 3 has a quadrangular annular shape in plan view. The frame 3 may be a member in which all four sides of the quadrangle are integrated, or a part of the frame 3 may be formed by joining separate members. The frame 3 maintains a constant distance (interval) between the substrate 2 and the translucent member 4 and constitutes a part of the accommodation space S in which the plurality of light emitting elements 5 are accommodated. Therefore, it is preferable that the frame 3 has a predetermined rigidity. The first surface 3a of the frame 3 is bonded to the first surface 2a of the substrate 2 via a bonding material (not shown) such as silver solder or gold-tin solder.

  The frame 3 serves to relieve stress generated in the translucent member 4. Therefore, the frame 3 is preferably made of a material having a linear expansion coefficient that is smaller than the linear expansion coefficient of the substrate 2 and larger than the linear expansion coefficient of the translucent member 4. As the material of the frame 3, for example, a ceramic material such as alumina, silicon carbide, or silicon nitride is preferably used, and alumina is particularly preferably used.

  The support member 9 is provided in a lattice shape on the first surface 2 a side of the substrate 2 so as to partition each of the plurality of light emitting elements 5. That is, one light emitting element 5 is arranged inside one grid-like section of the support member 9. The support member 9 supports each of the plurality of translucent members 4 together with the frame 3.

  The support member 9 is provided between the first light emitting element 51 and the second light emitting element 52 on the first surface 2 a side of the substrate 2 and between the third light emitting element 53 and the fourth light emitting element 54. It has been. The support member 9 is disposed between the first light emitting element 51 and the third light emitting element 53 on the first surface 2 a side of the substrate 2 and between the second light emitting element 52 and the fourth light emitting element 54. Is provided. The first surface 9a of the support member 9 is bonded to the first surface 2a of the substrate 2 via a bonding material (not shown) such as silver solder or gold-tin solder.

  As the material of the support member 9, like the frame 3, a ceramic material such as alumina, silicon carbide, or silicon nitride is preferably used, and alumina is particularly preferably used. In the present embodiment, the support member 9 is configured integrally with the frame 3, and the height (dimension in the Z direction) of the support member 9 is the same as the height of the frame 3 (dimension in the Z direction). Therefore, the second surface 3b of the frame 3 and the second surface 9b of the support member 9 are located on the same virtual plane. In the present embodiment, the support member 9 and the frame 3 are integrally formed, but the support member 9 and the frame 3 may be separate members.

  Each of the plurality of translucent members 4 is a plate-like member having optical transparency. The translucent member 4 has a quadrangular shape including a square and a rectangle in plan view. The translucent member 4 is provided on the second surface 3 b of the frame 3 and the second surface 9 b of the support member 9. Each of the plurality of translucent members 4 is provided corresponding to each of the plurality of light emitting elements 5. The plurality of translucent members 4 are a first translucent member 41 that transmits light emitted from the first light emitting element 51, and a second that transmits light emitted from the second light emitting element 52. And 9 pieces of translucent members as a whole.

  The translucent member 4 transmits light emitted from the light emitting element 5 corresponding to the translucent member 4. Therefore, as the material of the translucent member 4, a translucent material having a high light transmittance is preferably used. As a specific example of the translucent member 4, for example, borosilicate glass such as BK7, optical glass including quartz glass, synthetic quartz glass, crystal, sapphire, and the like are used. The translucent member 4 is bonded to the second surface 3b of the frame 3 and the second surface 9b of the support member 9 via a bonding material (not shown) such as a solder material or low-melting glass. The translucent member 4 may be formed by integrally forming an optical element such as a lens having a condensing function on one surface of the plate instead of a flat plate.

  The accommodation space S surrounded by the substrate 2, the frame 3, the support member 9, and the translucent member 4 is a sealed space that is blocked from outside air. By accommodating the light emitting element 5 in the accommodating space S, adhesion of foreign substances such as organic substances and moisture to the light emitting element 5 is reduced. The storage space S is preferably in a reduced pressure state. Alternatively, the storage space S may be filled with an inert gas such as nitrogen gas or dry air. Note that the reduced pressure state is a state of a space filled with a gas having a pressure lower than the atmospheric pressure. In the reduced pressure state, the gas filled in the accommodation space S is preferably an inert gas or dry air.

  As shown in FIG. 1, the frame 3 is provided with a plurality of through holes 3 c. Each of the plurality of through holes 3c is provided with an electrode 6 that supplies power to each of the plurality of light emitting elements 5. As a material for forming the electrode 6, for example, Kovar is used. A plating layer made of, for example, nickel-gold is formed on the surface of the electrode 6. In addition, a bonding wire (not shown) that electrically connects one end of the electrode 6 and the terminal of the light emitting element 5 is provided in the accommodation space S. The other end of the electrode 6 is connected to an external circuit (not shown). A gap between the inner wall of the through hole 3c of the frame 3 and the electrode 6 is sealed with a sealing material. As the sealing material, for example, low-melting glass is preferably used.

When manufacturing the light source device 1 having the above configuration, for example, the following manufacturing method can be employed. However, the following manufacturing method is an example, and is not limited to this manufacturing method.
First, a member in which the frame 3 and the support member 9 are integrated is joined to the first surface 2a of the substrate 2 by using a technique such as brazing or low melting point glass welding.

  Next, the plurality of light emitting elements 5 are bonded to the first surface 2 a of the substrate 2 using a bonding material such as solder or low melting point glass. In this step, as described above, the plurality of light emitting elements 5 are bonded onto the first surface 2 a of the substrate 2 via the submount 7. The order of the joining process of the frame 3 and the support member 9 to the substrate 2 and the joining process of the light emitting element 5 to the substrate 2 via the submount 7 may be any first. However, if the joining process of the frame 3 and the support member 9 is performed first, heat generated in the joining process of the frame 3 and the support member 9 can be prevented from being applied to the light emitting element 5.

  Next, the plurality of prisms 8 are bonded to the first surface 2 a of the substrate 2 using a bonding material such as solder or low-melting glass. Note that the bonding step of the prism 8 may be performed before the bonding step of the light emitting element 5.

Next, the electrode 6 is inserted into the through hole 3c of the frame 3 and fixed using a sealing material. Note that this step may be performed before the step of bonding the frame 3 and the support member 9 to the substrate 2.
Next, the light emitting element 5 and the electrode 6 are electrically connected using a bonding wire. Specifically, one end of the bonding wire is bonded to the electrode 6 and the other end of the bonding wire is bonded to the terminal of the light emitting element 5 using a technique such as ultrasonic bonding or thermocompression bonding.

Next, the frame 3 and the support member 9 that are bonded to the substrate 2 and the plurality of translucent members 4 are bonded using a technique such as brazing or low melting point glass welding. At this time, by performing the above-described bonding in a reduced pressure atmosphere, or in an inert gas atmosphere or in a dry air atmosphere, the interior of the accommodation space S is filled in a reduced pressure state or an inert gas, dry air, or the like. It becomes.
The light source device 1 is completed through the above steps.

  Conventionally, in a manufacturing process of a light source device, when a plurality of light emitting elements are mounted on one surface of a substrate, the substrate may be deformed such as warpage. When one light-transmitting member is bonded to the substrate on which this deformation has occurred and the light-emitting element is sealed, the light-transmitting member may be damaged or dropped, and airtightness may not be ensured. Or even if it is a light source device after sealing, if a temperature change occurs in the light source device, the translucent member may be damaged or dropped due to the difference in the linear expansion coefficient between the substrate and the translucent member. There was a case that could not be secured.

  With respect to these problems, in the light source device 1 of the present embodiment, the translucent member 4 that seals the second surface 3 b of the frame 3 and the second surface 9 b side of the support member 9 is divided for each light emitting element 5. The plurality of translucent members 4 are configured. Thereby, compared with the conventional light source device by which the whole was sealed with one translucent member, the stress which arises per one translucent member 4 can be made small. For this reason, even if the substrate 2 that is somewhat deformed is sealed with the translucent member 4, the translucent member 4 can be prevented from being damaged or dropped off. Moreover, even if the temperature change of the light source device 1 occurs after sealing, the translucent member 4 can be prevented from being damaged or dropped. As a result, the airtightness of the accommodation space S of the light emitting element 5 is ensured, and the reliability of the light source device 1 can be ensured.

  Particularly in the case of the present embodiment, a first light-transmissive member 41 is provided corresponding to the first light-emitting element 51, and a second light-transmissive member 42 is provided corresponding to the second light-emitting element 52. ing. Also for the other light emitting elements 5, one translucent member 4 is provided corresponding to one light emitting element 5. According to this structure, the dimension of each translucent member 4 can be made small according to the light emitting element 5, and damage and drop-off | omission of the translucent member 4 can fully be suppressed.

  In the present embodiment, each of the plurality of light emitting elements 5 is arranged to emit light L in a direction parallel to the first surface 2 a of the substrate 2. In this configuration, the light emission surface 5 a of the light emitting element 5 faces in the direction orthogonal to the first surface 2 a of the substrate 2, and the bottom surface 5 b faces in the direction parallel to the first surface 2 a of the substrate 2. Further, since the light emitting element is an edge emitting semiconductor laser, the area of the bottom surface 5b is wider than the area of the light emitting surface 5a. Therefore, a sufficient contact area between the light emitting element 5 and the submount 7 can be secured, and heat generated in the light emitting element 5 can be efficiently released to the substrate 2. Further, the plurality of lights L from the plurality of light emitting elements 5 can be emitted by the prism 8 in a direction substantially orthogonal to the first surface 2 a of the substrate 2, that is, in the normal direction of the translucent member 4.

  In the present embodiment, the accommodation space S in which the light emitting element 5 is accommodated is in a reduced pressure state or filled with an inert gas or dry air. Therefore, adhesion of foreign substances such as organic substances and moisture to the light emitting element 5 can be reduced as compared with the case where the accommodation space S is not in a reduced pressure state or is not filled with an inert gas or dry air. Thereby, the reliability of the light source device 1 can be further improved.

[Second Embodiment: Light Source Device]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5.
The basic configuration of the light source device of the second embodiment is the same as that of the first embodiment, and the form of dividing the translucent member is different from that of the first embodiment. Therefore, description of the whole light source device is abbreviate | omitted, and only a different structure from 1st Embodiment is demonstrated.
FIG. 4 is a perspective view of the light source device of the second embodiment. FIG. 5 is a plan view of the light source device.
4 and 5, the same reference numerals are given to the same components as those used in the first embodiment, and the description thereof will be omitted.

  In the light source device 1 of the first embodiment, one translucent member 4 is provided corresponding to one light emitting element 5. On the other hand, in the light source device 61 of the second embodiment, all the light emitting elements 5 are divided into a plurality of light emitting element groups 5A, and one light transmissive member 64 corresponds to one light emitting element group 5A. Is provided.

  Specifically, as shown in FIGS. 4 and 5, in the light source device 61 of the second embodiment, among the nine light emitting elements 5, in a direction (Y direction) orthogonal to the light emission direction in plan view. The three light emitting elements 5 arranged side by side are defined as a light emitting element group 5A. One translucent member 64 is provided for one light emitting element group 5 </ b> A composed of these three light emitting elements 5.

  The light source device 61 includes three translucent members 64 as a whole. The first light transmissive member 641 transmits a plurality of lights including the light emitted from the first light emitting element 51 and the light emitted from the third light emitting element 53. The second light transmissive member 642 transmits a plurality of lights including the light emitted from the second light emitting element 52 and the light emitted from the fourth light emitting element 54. The other light transmissive member 64 transmits a plurality of lights emitted from the plurality of light emitting elements 5 arranged in a direction orthogonal to the light emission direction.

  The support member 69 is linearly provided between the adjacent light emitting elements 5 aligned in the light emission direction (X direction), that is, between the adjacent light emitting element groups 5A, in plan view. Unlike the first embodiment, the support member 69 is not provided between the light emitting elements 5 adjacent to each other in the direction (Y direction) orthogonal to the light emission direction.

The submount 67 extends in a direction (Y direction) perpendicular to the light emission direction, and is provided in common for the three light emitting elements 5 constituting one light emitting element group 5A. In other words, the three light emitting elements 5 constituting one light emitting element group 5 </ b> A are provided on the same submount 67. The prism 68 extends in a direction (Y direction) perpendicular to the light emission direction, and is provided in common for the three light emitting elements 5 constituting one light emitting element group 5A. In other words, light emitted from the three light emitting elements 5 constituting one light emitting element group 5 </ b> A enters the same prism 68.
Other configurations are the same as those of the first embodiment.

  Also in the light source device 61 of the second embodiment, the use of the plurality of translucent members 64 can suppress the breakage and dropout of the translucent member 64, so that the reliability of the light source device 61 can be ensured. The same effects as in the first embodiment can be obtained.

  In the case of the second embodiment, the number of translucent members 64 to be used is reduced as compared with the first embodiment in which one translucent member 4 is provided corresponding to one light emitting element 5. Further, it is possible to suppress breakage or dropout of the translucent member 64. Furthermore, the number of submounts 67 and prisms 68 to be used can be reduced.

[Third Embodiment: Light Source Device]
Hereinafter, a third embodiment of the present invention will be described with reference to FIG.
The basic configuration of the light source device of the third embodiment is the same as that of the first embodiment, and the configurations of the translucent member and the prism are different from those of the first embodiment. Therefore, description of the whole light source device is abbreviate | omitted, and only the structure which concerns on a translucent member and a prism is demonstrated.
FIG. 6 is a cross-sectional view of the light source device of the third embodiment.
In FIG. 6, the same reference numerals are given to the same components as those used in the first embodiment, and the description will be omitted.

  In the light source device 1 of the first embodiment, the translucent member 4 and the prism 8 are provided as separate members. On the other hand, as shown in FIG. 6, in the light source device 71 of the third embodiment, the translucent member 74 includes a prism 78. That is, the translucent member 74 and the prism 78 are provided as an integral member.

In the light source device 71, the prism 78 transmits the light L traveling in a direction substantially parallel to the incident surface 78 a on which the light L emitted from the light emitting element 5 is incident and the first surface 2 a of the substrate 2. And a reflecting surface 78b for reflecting in a direction substantially perpendicular to the direction. The incident surface 78a faces in a direction substantially perpendicular to the first surface 2a of the substrate 2, and the reflecting surface 78b is inclined by approximately 45 ° with respect to the first surface 2a of the substrate 2. The prism 78 is provided integrally with the translucent member 74 on a surface 74 a on the side facing the accommodation space S of the two surfaces of the translucent member 74.
Other configurations are the same as those of the first embodiment.

  Also in the light source device 71 of the third embodiment, since the plurality of light transmissive members 74 are used, the light transmissive member 74 can be prevented from being damaged or dropped off, so that the reliability of the light source device 71 can be ensured. The same effects as in the first embodiment can be obtained.

  In the case of the third embodiment, since the translucent member 74 and the prism 78 are an integral member, the number of parts of the light source device 71 can be reduced, and the alignment of the translucent member 74 and the prism 78 with respect to the light emitting element 5 is achieved. Can be performed simultaneously. In that case, in order to facilitate the alignment work, for example, the frame 3 and the support member 9 may be provided with an alignment mark with the translucent member 74 or the like.

[projector]
Although an example of the projector according to the present embodiment will be described below, the present embodiment is not limited to these.

FIG. 7 is a schematic configuration diagram showing a projector 1000 according to the present embodiment.
As shown in FIG. 7, the projector 1000 includes an illumination device 100, a color separation light guide optical system 200, three liquid crystal light valves 400R as a light modulation device, a liquid crystal light valve 400G, a liquid crystal light valve 400B, a cross dichroic prism 500, and A projection optical system 600 is provided.

  The illumination device 100 includes a light source device 1, a condensing optical system 80, a wavelength conversion element 90, a collimating optical system 110, a first lens array 120, a second lens array 130, a polarization conversion element 140, and a superimposing lens 150.

  As the light source device 1, the above-described light source device 1 can be used. For example, the light source device 1 emits blue light B toward the condensing optical system 80.

  The condensing optical system 80 includes a first lens 82 and a second lens 84. The condensing optical system 80 is disposed in the optical path from the light source device 1 to the wavelength conversion element 90, and makes the blue light B substantially converged as a whole to enter a wavelength conversion layer 92 described later. The first lens 82 and the second lens 84 are convex lenses.

  The wavelength conversion element 90 is a so-called transmission type wavelength conversion element, and a single wavelength conversion layer 92 is continuously provided along a circumferential direction of the disk 96 on a part of a disk 96 that can be rotated by a motor 98. Formed. The wavelength conversion element 90 is configured to convert the blue light B into fluorescent light including red light R and green light G, and emit the fluorescent light toward the side opposite to the side on which the blue light B is incident. .

  The disc 96 is made of a material that transmits blue light B. As a material of the circular plate 96, for example, quartz glass, crystal, sapphire, optical glass, transparent resin, or the like can be used.

The blue light B from the light source device 1 enters the wavelength conversion element 90 from the disk 96 side.
The wavelength conversion layer 92 is formed on the disc 96 through a dichroic film 94 that transmits the blue light B and reflects the red light R and the green light G. The dichroic film 94 is composed of a dielectric multilayer film, for example.

The wavelength conversion layer 92 converts part of the blue light B having a wavelength of about 445 nm from the light source device 1 into fluorescent light and emits it, and passes the remaining part of the blue light B without conversion. That is, the wavelength conversion layer 92 is excited by the light emitted from the light source device 1 and emits fluorescent light. Thus, desired color light can be obtained using the light source device 1 that emits excitation light and the wavelength conversion layer 92. The wavelength conversion layer 92 is composed of, for example, a layer containing (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce and an organic binder, which is an example of a YAG phosphor.

  The collimating optical system 110 includes a first lens 112 and a second lens 114 each made of a convex lens. The collimating optical system 110 makes the light from the wavelength conversion element 90 substantially parallel.

  The first lens array 120 has a plurality of first small lenses 122 for dividing the light from the collimating optical system 110 into a plurality of partial light beams. The first lens array 120 includes a plurality of first small lenses 122 arranged in a matrix in a plane orthogonal to the illumination optical axis 100ax.

  The second lens array 130 has a plurality of second small lenses 132 arranged in a matrix in a plane orthogonal to the illumination optical axis 100ax. The plurality of second small lenses 132 are provided corresponding to the plurality of first small lenses 122 of the first lens array 120. The second lens array 130 forms an image of each first small lens 122 of the first lens array 120 together with the superimposing lens 150 in the vicinity of the image forming areas of the liquid crystal light valve 400R, the liquid crystal light valve 400G, and the liquid crystal light valve 400B. Let

  The polarization conversion element 140 is a polarization conversion element that emits the polarization direction of each partial light beam divided by the first lens array 120 as approximately one type of linearly polarized light having a uniform polarization direction. The polarization conversion element 140 includes a polarization separation layer, a reflection layer, and a retardation plate. The polarization separation layer transmits one linearly polarized light component of the polarized light components included in the light from the wavelength conversion element 90 as it is, and reflects the other linearly polarized light component in a direction perpendicular to the illumination optical axis 100ax. The reflective layer reflects the other linearly polarized light component reflected by the polarization separation layer in a direction parallel to the illumination optical axis 100ax. The phase difference plate converts the other linearly polarized light component reflected by the reflective layer into one linearly polarized light component.

  The superimposing lens 150 condenses the partial light beams from the polarization conversion element 140 and superimposes them in the vicinity of the image forming areas of the liquid crystal light valve 400R, the liquid crystal light valve 400G, and the liquid crystal light valve 400B.

  The first lens array 120, the second lens array 130, and the superimposing lens 150 constitute an integrator optical system that makes the in-plane light intensity distribution of the light from the wavelength conversion element 90 uniform.

  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, a relay lens 260, and a relay lens 270. The color separation light guide optical system 200 separates light from the illumination device 100 into red light R, green light G, and blue light B, and each color light of the red light R, green light G, and blue light B is an illumination target. The liquid crystal light valve 400R, the liquid crystal light valve 400G, and the liquid crystal light valve 400B are guided.

  A field lens 300R, a field lens 300G, and a field lens 300B are disposed between the color separation light guide optical system 200 and the liquid crystal light valve 400R, the liquid crystal light valve 400G, and the liquid crystal light valve 400B.

  The dichroic mirror 210 passes the red light R component and reflects the green light G component and the blue light B component toward the dichroic mirror 220. The dichroic mirror 220 reflects the green light G component toward the field lens 300G and transmits the blue light B component.

  The red light R that has passed through the dichroic mirror 210 is reflected by the reflection mirror 230, passes through the field lens 300R, and enters the image forming region of the liquid crystal light valve 400R for red light R.

  The green light G reflected by the dichroic mirror 210 is further reflected by the dichroic mirror 220, passes through the field lens 300G, and enters the image forming area of the liquid crystal light valve 400G for green light G.

  The blue light B that has passed through the dichroic mirror 220 passes through the relay lens 260, the incident-side reflecting mirror 240, the relay lens 270, the emitting-side reflecting mirror 250, and the field lens 300B, and the image of the blue light B liquid crystal light valve 400B. Incident into the formation area.

  The liquid crystal light valve 400R, the liquid crystal light valve 400G, and the liquid crystal light valve 400B modulate light emitted from the light source device 1. These liquid crystal light valves modulate incident color light according to image information to form a color image, and are to be illuminated by the illumination device 100.

  Although not shown, an incident-side polarizing plate and an emitting-side polarizing plate are provided on the light incident side and the light emitting side of the liquid crystal light valve 400R, respectively. The same applies to the liquid crystal light valve 400G and the liquid crystal light valve 400B.

  The cross dichroic prism 500 combines the image light emitted from each of the liquid crystal light valve 400R, the liquid crystal light valve 400G, and the liquid crystal light valve 400B to form a color image. The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and a dielectric multilayer film is formed on a substantially X-shaped interface in which the right-angle prisms are bonded together.

  The projection optical system 600 projects the color image formed by the liquid crystal light valve 400R, the liquid crystal light valve 400G, and the liquid crystal light valve 400B onto the screen SCR.

  Since the projector 1000 includes the light source device 1 described above, the projector 1000 can display an image with high reliability and desired brightness. Further, since the projector 1000 includes the wavelength conversion element 90, an image of a desired color can be displayed. In addition, you may use the fluorescent substance which emits fluorescent lights other than yellow as fluorescent substance. For example, a phosphor that emits red fluorescent light or a phosphor that emits green fluorescent light may be used. A wavelength conversion element that emits fluorescent light of any color can be selected according to the application of the projector.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, one light-transmitting member corresponds to one light-emitting element (first embodiment and third embodiment), one light-emitting element group (in a direction orthogonal to the emission direction) An example (second embodiment) in which one translucent member corresponds to a plurality of light emitting elements arranged side by side is shown. Instead of these configurations, for example, one light transmissive member may correspond to a part of the light emitting elements in the light emitting element group, or one light transmissive member may correspond to a plurality of light emitting element groups. The member may correspond. That is, the effect of the present invention can be obtained as long as the area surrounded by the frame in plan view is covered with the plurality of divided translucent members, and the number, shape, dimensions, and the like of the translucent members are particularly limited. Not.

  In the above embodiment, an example in which the light source device includes a submount has been described. However, the light source device does not necessarily include the submount. Regardless of the presence or absence of the submount, the plurality of light emitting elements may be arranged such that the light emission direction faces the normal direction of the first surface of the substrate (the direction of the translucent member). In that case, a prism that bends the optical path of the light emitted from the light emitting element can be eliminated.

  Instead of a configuration in which a plurality of translucent members are joined to the flat second surface of the frame and the support member, the frame and the support member are provided with a step portion that is one step lower than the second surface on the first surface side. The frame, the support member, and the translucent member may be joined in a state where the translucent member is fitted in the stepped portion. In this case, the step portion can be used as a positioning means for the translucent member, and the joining operation of the translucent member can be facilitated.

  The frame and the support member may not all be configured as an integral member, and a plurality of members may be stacked in the height direction of the frame and the support member. For example, it may be composed of two members divided into two at the position of the through hole in which the electrode is inserted.

  In the above embodiment, an example in which the present invention is applied to a transmissive projector has been described, but the present invention can also be applied to a reflective projector. Here, “transmission type” means that a liquid crystal light valve including a liquid crystal panel or the like is in a form of transmitting light. “Reflective type” means that the liquid crystal light valve reflects light. The light modulation device is not limited to a liquid crystal light valve, and for example, a digital micromirror device may be used.

  In the above embodiment, an example of a projector using three liquid crystal panels has been given, but the present invention can also be applied to a projector using only one liquid crystal light valve, and a projector using four or more liquid crystal light valves. It is.

  In the above embodiment, an example of a light source device including a transmission type wavelength conversion element has been described. However, a light source device including a reflection type wavelength conversion element may be used. Furthermore, although the example in which the light source device includes the wavelength conversion element has been described, the light source device may not include the wavelength conversion element. In such a case, if the light source device is used as at least one of a light source device that emits red light, a light source device that emits green light, and a light source device that emits blue light, as the light source device of the projector. Good.

  In the said embodiment, although the example which mounted the light source device by this invention in the projector was shown, it is not limited to this. The light source device according to the present invention can also be applied to lighting fixtures, automobile headlights, and the like.

  DESCRIPTION OF SYMBOLS 1,61,71 ... Light source device, 2 ... Board | substrate, 2a ... (the board | substrate) 1st surface, 3 ... Frame, 4, 64, 74 ... Translucent member, 5 ... Light emitting element, 8, 68, 78 ... Prism , 9, 69 ... support member, 41 ... first light transmissive member, 42 ... second light transmissive member, 51 ... first light emitting element, 52 ... second light emitting element, 53 ... third light emission. Element: 54 ... 4th light emitting element, 90 ... Wavelength conversion element, 400R, 400G, 400B ... Liquid crystal light valve (light modulation device), 600 ... Projection optical system, 1000 ... Projector, S ... Accommodating space.

Claims (8)

A substrate having a first surface;
A plurality of light emitting elements provided on the first surface side of the substrate and including a first light emitting element and a second light emitting element;
A frame provided around the plurality of light emitting elements on the first surface side of the substrate;
A support member provided between the first light emitting element and the second light emitting element on the first surface side of the substrate;
A plurality of translucent members provided on the opposite side of the frame and the support member from the substrate;
A light source device.   The plurality of translucent members include a first translucent member that transmits light emitted from the first light emitting element and a second translucent member that transmits light emitted from the second light emitting element. The light source device according to claim 1, further comprising a light member. The plurality of light emitting elements are arranged such that light emission directions from the respective light emitting elements are directed in substantially the same direction when viewed from the normal direction of the first surface,
The first light emitting element and the second light emitting element are arranged side by side in the emission direction,
The plurality of light emitting elements includes a third light emitting element arranged alongside the first light emitting element in a direction intersecting with the emission direction as seen from the normal direction of the first surface, and the emission direction. A fourth light emitting element arranged alongside the second light emitting element in the intersecting direction, and
The first translucent member transmits light emitted from the first light emitting element and light emitted from the third light emitting element,
The light source device according to claim 2, wherein the second light transmissive member transmits light emitted from the second light emitting element and light emitted from the fourth light emitting element. Each of the plurality of light emitting elements emits light in a direction substantially parallel to the first surface of the substrate,
4. The prism according to claim 1, further comprising: a prism having a light reflecting surface that reflects the light emitted from each of the plurality of light emitting elements toward a direction substantially orthogonal to the first surface of the substrate. The light source device according to one item.   The light source device according to claim 4, wherein at least one of the plurality of translucent members includes the prism. An accommodation space surrounded by the substrate, the frame, the support member, and the plurality of translucent members;
The light source device according to any one of claims 1 to 5, wherein the housing space is in a reduced pressure state or filled with an inert gas or dry air. The light source device according to any one of claims 1 to 6,
A light modulation device that modulates light emitted from the light source device;
A projection optical system that projects light modulated by the light modulation device.   The projector according to claim 7, further comprising a wavelength conversion element that is excited by the light and emits fluorescent light.

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