JP2008128636A - Light-emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting device having a constitution capable of highly reliably detecting the breakage of wires in a light-emitting device which emits light from a semiconductor light-emitting element through the use of a light guide material such as an optical fiber. <P>SOLUTION: The light-emitting device includes a light source, the light guide material optically connected to the light source, a wavelength conversion member provided for an emergent-side end of the light guide material for converting the wavelength of light from the light source, and a detection member for detecting the breakage of wires of the light guide material. The light guide material makes its surface carry at least two electrically conductive members or more continuous from the side of the light source to its emergent side. The electrically conductive members are connected in such a way as to be continuous to each other at an emergent-side face of a translucent member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light emitting device that can be used for a laser display, an endoscope, an exposure apparatus, and the like, and more particularly, to a light emitting device using a semiconductor light emitting element and a light guide member.

  An apparatus that transmits light from a light source through a light guide member such as an optical fiber is used as an optical communication device or an illumination device such as an endoscope. Such an apparatus may be cut (disconnected) for some reason because the optical fiber is a member having low mechanical strength. When laser light is used as the light source, it is dangerous because the laser light leaks from the cut surface. Especially, in the case of optical communication equipment and exposure equipment, light with a wavelength that cannot be seen by human eyes is used. Therefore, there is a risk that light leaked without being noticed may enter the eye and damage the eyeball. In order to detect such disconnection of the optical fiber, a method of arranging an optical fiber and an optical sensor in the vicinity of the laser diode of the light source is known. As a result, there is a method in which return light reflected by the disconnection portion can be detected by a sensor (see, for example, Patent Document 1).

JP-A-9-181384

  In the above method, it is possible to detect the disconnection of the optical fiber by detecting the return light, but it may be difficult to detect an abnormality depending on the state of the disconnection. For example, the tip of the optical fiber is made flat by cleaving or polishing, but the broken surface may become a cleaved surface. In such a case, it cannot be determined whether the detected return light is the return light reflected by the original emission end face or the return light reflected by the broken surface. For this reason, there is a case where an abnormality (disconnection of the optical fiber) cannot be accurately detected.

  The present invention solves the above-described problem. In a light-emitting device in which light from a semiconductor light-emitting element is guided using a light guide member such as an optical fiber, and the wavelength is converted at the tip of the light-emitting device. An object of the present invention is to provide a light emitting device having a configuration capable of detecting disconnection with high accuracy by electrically detecting disconnection of an optical fiber and abnormality of peripheral members.

  In order to achieve the above object, a light emitting device according to the present invention includes a light source, a light guide member optically connected to the light source, and a wavelength of light from the light source provided at an output side end of the light guide member. A light-emitting device comprising a wavelength conversion member for conversion and a detection member for detecting disconnection of the light guide member, wherein the light guide member has at least two conductive members continuous on the surface from the light source side to the emission side. And the conductive members are connected to each other on the emission side end face of the translucent member so as to be electrically connected to each other. Thereby, disconnection of the light guide member can be easily detected.

  In the light-emitting device according to claim 2 of the present invention, the wavelength conversion member has a translucent conductive member that can transmit light from the light source, and the conductive members can conduct with each other through the translucent conductive member. It is characterized by being connected as follows. Thereby, while being able to detect the disconnection of a light guide member easily, abnormality of the wavelength conversion member provided in the output side edge part of a light guide member can also be detected.

  With the light emitting device according to the present invention, the disconnection of the light guide member can be accurately detected. In particular, even when it is difficult to detect an abnormality due to the state of the disconnected surface, it is possible to detect the disconnection with high accuracy. As a result, in an exposure apparatus that uses a short wavelength such as ultraviolet rays as a light source, the light leaked due to the disconnection is not generated by mistakenly exposing other members arranged in the work environment. Can be reduced. In addition, in light-emitting devices used for endoscopes where it is difficult to confirm the object to be irradiated, it is possible to accurately grasp the state of the object to be irradiated by detecting the disconnection more accurately. The leaking light can prevent adverse effects on surrounding organs.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, the form shown below illustrates the light emitting device for embodying the technical idea of the present invention, and the present invention does not limit the light emitting device to the following.

  Further, the present specification by no means specifies the members shown in the claims to the members of the embodiments. The dimensions, materials, shapes, relative arrangements, and the like of the components described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It is just an example. It should be noted that the size and positional relationship of the members shown in each drawing may be exaggerated for clarity of explanation. Further, in the following description, the same name and reference sign indicate the same or the same members, and detailed description will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. The light-emitting device of the present invention will be described below with reference to the drawings.

1. Embodiment 1
FIG. 1A shows a light-emitting device 100 according to Embodiment 1. FIG. 1B is a diagram showing a configuration of an optical component 110 used in the light emitting device of FIG. 1A. 1C is an enlarged cross-sectional view of the optical component 110 of FIG. 1B, and FIG. 1D is a partially enlarged cross-sectional view of the optical component 110 of FIG. 1B. As shown in FIG. 1A, the light emitting device according to Embodiment 1 is roughly composed of a light source 120, a light guide member 130, an optical component 110, and a detection member (terminal) 150. Members other than the detection member 150b are connected so as to be optically continuous. The light from the light source 120 propagates through the light guide member 130 and reaches the optical component 110 provided at the tip of the light guide member, and then most of the light passes through the optical component and is emitted to the outside. Then, two conductive members 131a and 131b are provided on the surface of the light guide member 130 so as to have a two-layer structure via the insulating member 132, and disconnection is observed by observing an electric signal transmitted through these conductive members. Detect.

  Specifically, the light source 120 includes a semiconductor laser element having a main wavelength of blue as the semiconductor light emitting element 122 inside the package 121, a lens 140 that collects light from the light source 120 and collects the light. A connector (terminal) 150a for introducing the emitted light into the light guide member 130, a light guide member 130 connected to the connector (terminal) 150a, and an optical component 110 at the tip of the light guide member 130. ing. As shown in FIG. 1B, the optical component 110 includes a holding member 112 that is attached to the end of the light guide member 130 on the emission side, a flange 111 to which the holding member 112 is fixed, and a cap 116 that protects the tip. And have. The tip of the cap 116 is provided with a through hole (opening) for emitting light, and a translucent member 117 is provided in the through hole. The translucent member 117 is fixed to the through hole of the cap 116 by the joining member 118, and the light propagating through the light guide member 130 passes through the translucent member 117 and is emitted to the outside. The wavelength conversion member is provided so as to be mixed in the translucent member 117.

  In the first embodiment, two conductive members 131a and 131b continuous from the light source side to the emission side are provided on the surface of the light guide member 130 so as to have a two-layer structure via the insulating member 132. The conductive members 131a and 131b are connected to each other on the emission side end face so as to be conductive with each other. Thereby, it can be detected that the electrical signal changes when the light guide member 130 is disconnected. Further, at the tip of the light guide member 130, the processing for conducting the conductive members 131a and 131b having a two-layer structure is performed such that the light guide member (optical fiber) 130 is conducted so that 131a and 131b are conducted as shown in FIG. 1D. The conductive member 114a may be disposed on the end surface excluding the core and the end surface of the holding member 112, or the light transmitting member (optical fiber) 130 and the entire holding member 112 may be transparent as shown in FIG. 1E. The held conductive member 114b may be disposed. Although it becomes more difficult as the light guide member 130 becomes thinner, the structure shown in FIG. 1E makes it possible to easily conduct electricity.

<Light guide member>
In Embodiment 1, at least two or more conductive members are provided on the surface of the light guide member so as to have a two-layer structure through an insulating member. That is, each conductive member is provided so as to be electrically insulated from each other on the surface of the light guide member. And it connects so that it may be conduct | electrically_connected at the output side end surface of a light guide member. In particular, at the front end of the light guide member, each is connected so as to be conductive, whereby a defect in the entire light guide member can be detected.

  The light guide member may be any member that is optically connected to the light source and guides light from the light source to the optical component. For example, a core having a high refractive index is disposed on the inside and a clad having a low refractive index is disposed on the outside, and these are configured to extend in the longitudinal direction. The diameter of the light guide member is not particularly limited, but is preferably configured to be bendable and can be appropriately selected depending on the application. Specific examples of the material include an optical fiber made of quartz, multi-component glass, plastic, a holey fiber, or a liquid fiber using a liquid as a core. In particular, when a light source having a wavelength in the short wavelength region is used, an optical fiber using quartz is preferable.

  The cross-sectional shape of the light guide member is not particularly limited, but is preferably circular. The end face of the light guide member on the side from which light is emitted is preferably a flat plane and a plane perpendicular to the optical axis. However, the shape of the light source side end portion of the light guide member is not particularly limited, and may be various shapes such as a flat surface, a convex lens, a concave lens, and a shape having at least partial unevenness.

  The conductive member provided on the surface of the light guide member may be a member having excellent conductivity, and a metal material is preferable. Furthermore, it is preferable that the light guide member is difficult to expand and contract when the light guide member is disconnected. Specifically, a metal wire, a metal braid, a metal conductive film, etc. which consist of metal materials, such as silver, gold | metal | money, copper, nickel, iron, or an alloy containing these metals, are mentioned. Of the two-layer structure, both may be the same member or different members. As for the film thickness, an arbitrary film thickness can be selected in consideration of the diameter of the light guide member, the hardness of the light guide member, and other parts such as the holding member.

  As shown in FIG. 1D, when the conductive member 114a is not provided at the emission-side tip of the light guide member 130, that is, provided at a position that does not block the emitted light, the translucency of the conductive member 114a does not matter. It can be provided with an arbitrary film thickness. As the conductive member for conducting two or more conductive members provided in the light guide member at the tip of the light guide member, the same conductive member as that provided in the light guide member may be used. However, it is preferable to use a member having a relatively high reflectance with respect to light from a light source or light converted by a wavelength conversion member, and silver, gold, aluminum, rhodium, palladium, indium, chromium, and the like are preferable. Further, a multilayer film or an alloy using a plurality of these members may be used. Further, the conductive member 114 a may be provided on the translucent member 117 or may be provided on the holding member 112. When the light-transmitting member 117 is provided, the electrical signal is interrupted when the light-transmitting member 117 is detached for some reason. Therefore, such damage can be detected. Further, when provided on the holding member side, the conductive member can be provided relatively easily, and the film thickness and the like can be easily controlled. In addition, when providing so that the front-end | tip of the light guide member 131 as shown to FIG. 1E may also be coat | covered, it mentions later in detail.

  The insulating member interposed between the conductive members may be any member that can be insulated. For example, resin, paper, glass, fiber using these materials, or the like can be given. Further, it is preferable that the conductive member is more elastic than the conductive member so that the conductive member does not conduct at the disconnected portion even when the light guide member is disconnected. Specific examples include nylon, silicon, and fluororesin. These can be easily obtained by applying a melted material after forming the first layer of the conductive member. Further, the insulating member may be a single layer or may have a multilayer structure in which the above members are stacked.

  Further, between the conductive member and the light guide member or between the conductive member on the outermost periphery and the holding member, a member having a lower hardness or a member having a higher elasticity than those members is interposed. Is preferred. For example, when the translucent member is bent by interposing a resin or the like, the light guide member can be prevented from being damaged and disconnected by the conductive member.

<Detection member>
In the first embodiment, the detection member detects an electric signal that is conducted through a conductive member provided on the surface of the light guide member, and examples thereof include an ammeter and a voltmeter. These may be mounted together with a semiconductor light emitting element or the like in the light source, or may be provided as separate members.

<Optical parts>
In the first embodiment, the optical component is a member provided at the tip of the light guide member, and the light distribution characteristics of the light emitted by the optical component can be adjusted. In the present invention, only a mechanism for extracting light will be described, but it goes without saying that other members such as a CCD camera can be used in combination.

  Specifically, as illustrated in FIG. 1B, the optical component 110 includes a holding member 112 attached to an end portion on the light emission side of the light guide member 130, and a flange 111 to which the holding member 112 is fixed. . Furthermore, it has a cap which covers the front-end | tip part of a holding member or a light guide member. In addition to the configuration described below, various configurations can be used depending on the purpose and application.

(Holding member)
In the first embodiment, the holding member is a member provided in the vicinity of the tip of the light guide member, whereby the tip of the light guide member can be easily processed. The size and shape of the holding member are not particularly limited, but a cylindrical one is preferable. As a material for the holding member, a material having a high reflectance with respect to light from a light source and light from a wavelength conversion member described later is preferable. Moreover, a thing with high heat conductivity is preferable. In particular, there is a case where heat is generated when light from a light source, light reflected by a covering member, or the like is irradiated to a translucent member described later or a fluorescent member to be contained therein. In such a case, the holding member is made of a material having a higher thermal conductivity than at least the translucent member or the fluorescent member because it tends to cause alteration such as a change in chromaticity or a decrease in luminous intensity. Is preferred. Specific examples of such materials include metals (stainless steel, copper, brass, kovar, nickel, aluminum, silver, or alloys using these materials), oxides (alumina (Al ₂ O ₃ ), zirconia (ZrO ₂ )). )), Carbides (silicon carbide (SiC), diamond) and the like. These can be used alone or in combination. For example, a high-reflectance member is provided on the surface of a member that has high thermal conductivity but poor reflectivity, and can be used as a combination material in which the thermal function and the optical function are separated from each other.

(cap)
In Embodiment 1, the cap is provided so as to be fitted to a holding member provided at the tip of the light guide member, and is a member for protecting the tip portion of the light guide member. However, an opening is provided so as not to block light from the light guide member, and a transparent member capable of transmitting light from the light source is provided in the opening.

  When providing a translucent member in the opening part of a cap, it can be made to adhere to a cap using a joining member etc., or can be made into a shape which can be held mechanically. For example, as shown in FIG. 1B, a translucent member 117 bonded to the opening of the cap 116 by a bonding member 118 such as low-melting glass is provided.

  The shape of the cap is not particularly limited as long as it can protect the end portions of the holding member and the light guide member, and preferably a cylindrical shape. Thus, by not providing corners on the outer periphery, problems such as damage to the human body can be reduced when used as an endoscope or the like. Furthermore, it is preferable that the outer periphery including the flange is cylindrical. However, when a plurality of optical components are used, for example, in an illumination device, a quadrangular prism shape or the like may be used so that the optical component can be easily fixed.

The cap material is not particularly limited, but a material having high thermal conductivity is preferable. In particular, heat may be generated when light from a light source, light reflected by a covering member, or the like is irradiated onto a translucent member or a fluorescent member contained therein. In such a case, it is easy to cause alteration such as change in chromaticity or decrease in luminosity. Therefore, the cap material should be a member having a higher thermal conductivity than at least a translucent member or a fluorescent member. preferable. As such a material, specifically, as such a material, specifically, metal (stainless steel, copper, brass, kovar, nickel, aluminum, silver, or an alloy using these materials), oxide (alumina (Al ₂ O ₃ ), zirconia (ZrO ₂ )), carbides (silicon carbide (SiC), diamond) and the like. These may be used alone or as a composite material (mixed material).

  Further, the size and shape of the through-hole (opening) of the cap are not particularly limited as long as light from the light guide member can be transmitted, and preferably a circular through-hole is preferable. . Further, the diameter of the through hole may be the same throughout, or may be provided with a portion substantially equal to the outer peripheral diameter of the holding member and a portion wider than that. Moreover, it is good also as a through-hole which spreads gradually toward an opening side, or becomes narrow gradually. Moreover, about the number of through-holes, although what provided one through-hole in FIG. 1 is illustrated, it is not restricted to this, You may provide two or more. Furthermore, the loss of light can be reduced by providing a member having a high reflectance with respect to light from the light source on the inner wall of the through hole of the cap. Such a highly reflective film can provide the above-mentioned effect by being provided on a part of the inner wall of the cap, but it is particularly preferable to provide it on the entire surface.

  Moreover, the translucent member provided so that it may be located in the output side of a light guide member in the opening part of a cap can also provide a wavelength conversion member as mentioned later. This wavelength conversion member is a member that is excited by light from the light source and can be converted into light having a wavelength different from that of the light source. By providing such a wavelength conversion member, the light can be emitted as light having a desired color tone. Is possible. Therefore, light of various color tones can be emitted depending on the combination of the wavelength of the light source and the wavelength conversion member.

(Translucent member)
In Embodiment 1, the translucent member is disposed in the through hole (opening) of the cap, and a wavelength conversion member can also be provided. This wavelength conversion member is a member that is excited by light from the light source and can be converted into light having a wavelength different from that of the light source. By providing such a wavelength conversion member, the light can be emitted as light having a desired color tone. Is possible. Therefore, light of various color tones can be emitted depending on the combination of the wavelength of the light source and the wavelength conversion member. Furthermore, a conductive member can be provided. When not provided at the tip of the light guide member 130 as shown in FIG. 1E, a conductive member can be provided as described above without being limited to translucency and opaque. However, as shown in FIG. 1E, the tip of the light guide member 130 is provided. In the case where it is also provided, a translucent conductive member capable of transmitting light from the light source is provided. Since conduction of two or more conductive members provided in the light guide member is achieved through such a conductive member or a translucent conductive member, it is possible to detect a change in an electrical signal generated when the light guide member is disconnected. Become.

The light-transmitting conductive member may be any member that can transmit light from a light source. For example, nickel (Ni), platinum (Pt) palladium (Pd), rhodium (Rh), ruthenium (Ru), osmium ( Os), iridium (Ir), titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), cobalt (Co), iron (Fe), manganese ( Mn), molybdenum (Mo), chromium (Cr), tungsten (W), lanthanum (La), copper (Cu), silver (Ag), a metal containing at least one selected from the group consisting of yttrium (Y), There are alloys, laminated structures, and compounds thereof, such as conductive oxides and nitrides. As a conductive metal oxide (oxide semiconductor), tin-doped indium oxide (Indium Tin Oxide; ITO), ZnO (zinc oxide), In ₂ O ₃ (indium oxide), or SnO with a thickness of 5 nm to 10 μm is doped. ₂ (tin oxide), and these composites, for example, IZO (Indium Zinc Oxide). These are preferably used because they are advantageous in terms of translucency, and materials are appropriately selected depending on the wavelength of light. Further, a semiconductor constituent element, a semiconductor dopant, or the like can be used as a doping material of the conductive material. For those that can obtain translucency by controlling the film thickness, they are provided so that the transmittance of light from the light source is about 50% or more. Moreover, about 100-10000cm is preferable, and relatively high translucency things, such as ITO, More preferably, it is 1000-5000cm. These may be used as a single layer or may have a multilayer structure in which different materials are laminated in two or more layers. Moreover, in FIG. 1C, although the translucent conductive member is provided so that it may be located in the front-end | tip part of the light guide member 130, and the translucent member 117, it is not restricted to this, For example, FIG. 2C As shown in FIG. 4, it can be provided so as to cover the surface of the translucent member. In other words, it may be provided at a position where conduction with the conductive member provided on the light guide member can be achieved, and it can be mixed in the translucent member.

  As the translucent member, those that easily transmit light from a light source or a fluorescent member are preferable. Specifically, glass, silicone resin, epoxy resin, or the like is preferably used. Those having a certain degree of strength are preferable in order to function as protective members. For example, when processing into a circular plate shape first and forming it so that it may join to a cap using a joining member, it is preferable that the thickness of a translucent member shall be about 0.1 mm-1.0 mm. . Moreover, it can also be set as the lens-shaped translucent member instead of such circular plate shape.

  As a joining member for joining the translucent member, it is preferable to use a member having high adhesion in consideration of the material of the cap and the translucent member. Furthermore, it is preferable to use a member that hardly absorbs light from the light source or the fluorescent member.

  In addition to the method of forming the translucent member in a separate process and joining it to the cap using the joining member, it can be mechanically fixed as a cap shape that can lock the translucent member. . Alternatively, instead of forming the translucent member in a solid state in a separate process, after the cap is fitted to the holding member, the translucent member before curing is potted and then cured. Etc. can also be provided.

  Moreover, the wavelength conversion member and diffusion member which are mentioned later can be mixed in this translucent member.

(Wavelength conversion member)
In the translucent member, a fluorescent member that emits light having a different wavelength by absorbing at least a part of light from the semiconductor light emitting element may be included as a wavelength conversion member. The fluorescent member is preferably used by being mixed in a translucent member such as glass or resin. At this time, in addition to the fluorescent member, a diffusing member or the like can be used together.

  As the fluorescent member, it is more efficient to convert the light from the semiconductor light emitting element into a longer wavelength. The fluorescent member may be formed of a single type of fluorescent material or the like, or may be formed of a single layer in which two or more types of fluorescent material are mixed, or contains one type of fluorescent material, etc. Two or more single layers may be stacked, or two or more single layers each of which is mixed with two or more kinds of fluorescent substances may be stacked.

  Any fluorescent member may be used as long as it absorbs light from a semiconductor light emitting device having a nitride semiconductor as a light emitting layer and converts the light to light of a different wavelength. For example, nitride phosphors / oxynitride phosphors mainly activated by lanthanoid elements such as Eu and Ce, lanthanoid phosphors such as Eu, and alkalis mainly activated by transition metal elements such as Mn Earth halogen apatite phosphor, alkaline earth metal borate halogen phosphor, alkaline earth metal aluminate phosphor, alkaline earth silicate, alkaline earth sulfide, alkaline earth thiogallate, alkaline earth silicon nitride At least selected from organic and organic complexes mainly activated by lanthanoid elements such as germanate or lanthanoid elements such as Ce, rare earth aluminate, rare earth silicate or Eu Any one or more are preferable. As specific examples, the following phosphors can be used, but are not limited thereto.

A nitride phosphor mainly activated by a lanthanoid element such as Eu or Ce is M ₂ Si ₅ N ₈ : Eu (M is at least one selected from Sr, Ca, Ba, Mg, Zn). There is.) In addition to M ₂ Si ₅ N ₈ : Eu, MSi ₇ N ₁₀ : Eu, M _1.8 Si ₅ O _0.2 N ₈ : Eu, M _0.9 Si ₇ O _0.1 N ₁₀ : Eu (M Is at least one selected from Sr, Ca, Ba, Mg, and Zn.

Nitride phosphors activated by rare earth elements such as Eu and containing Group II elements M, Si, Al, and N, absorb ultraviolet or blue light and emit light in the yellow-red to red range. To do. The nitride phosphor has the general formula _{M w Al x Si y N (} (2/3) w + x + (4/3) y): shown by Eu, rare earth elements and tetravalent element to an additional element, 3 At least one element selected from valent elements. M is at least one selected from the group consisting of Mg, Ca, Sr, and Ba.

  In the above general formula, the ranges of w, x, and y are preferably 0.04 ≦ w ≦ 9, x = 1, 0.056 ≦ y ≦ 18. The range of w, x, and y may be 0.04 ≦ w ≦ 3, x = 1, 0.143 ≦ y ≦ 8.7, more preferably 0.05 ≦ w ≦ 3, x = 1, 0. 167 ≦ y ≦ 8.7.

The nitride phosphor is generally added boron B formula _{M w Al x Si y B z} N ((2/3) w + x + (4/3) y + z): can also be Eu. Also in the above, M is at least one selected from the group consisting of Mg, Ca, Sr, and Ba, and 0.04 ≦ w ≦ 9, x = 1, 0.056 ≦ y ≦ 18, 0.0005 ≦ z ≦ 0.5. When boron is added, the molar concentration z is set to 0.5 or less as described above, preferably 0.3 or less, and further set to be greater than 0.0005. More preferably, the molar concentration of boron is set to 0.001 or more and 0.2 or less.

  Further, these nitride phosphors are at least one selected from the group of La, Ce, Pr, Gd, Tb, Dy, Ho, Er, Lu, or any one of Sc, Y, Ga, In, Alternatively, any one of Ge and Zr is contained. By containing these, luminance, quantum efficiency, or peak intensity equal to or higher than Gd, Nd, and Tm can be output.

An oxynitride phosphor mainly activated by a lanthanoid element such as Eu or Ce is MSi ₂ O ₂ N ₂ : Eu (M is at least one selected from Sr, Ca, Ba, Mg, Zn) Etc.).

Alkaline earth halogen apatite phosphors mainly activated by lanthanoid elements such as Eu and transition metal elements such as Mn include M ₅ (PO ₄ ) ₃ X: R (M is Sr, Ca, Ba, At least one selected from Mg and Zn, X is at least one selected from F, Cl, Br, and I. R is at least one selected from Eu, Mn, Eu and Mn. Etc.).

The alkaline earth metal borate phosphor has M ₂ B ₅ O ₉ X: R (M is at least one selected from Sr, Ca, Ba, Mg, Zn. X is F, Cl , Br, or I. R is Eu, Mn, or any one of Eu and Mn.).

Alkaline earth metal aluminate phosphors include SrAl ₂ O ₄ : R, Sr ₄ Al ₁₄ O ₂₅ : R, CaAl ₂ O ₄ : R, BaMg ₂ Al ₁₆ O ₂₇ : R, BaMg ₂ Al ₁₆ O ₁₂ : R, BaMgAl ₁₀ O ₁₇ : R (R is one or more of Eu, Mn, Eu and Mn).

The alkaline earth silicate _{phosphor, (Sr 1-a-b} -x Ba a Ca b Eu x) 2 SiO 4 (0 ≦ a ≦ 1,0 ≦ b ≦ 1,0.005 ≦ x ≦ 0 .1).

Examples of the alkaline earth sulfide phosphor include La ₂ O ₂ S: Eu, Y ₂ O ₂ S: Eu, and Gd ₂ O ₂ S: Eu.

Examples of rare earth aluminate phosphors mainly activated with lanthanoid elements such as Ce include Y ₃ Al ₅ O ₁₂ : Ce, (Y _0.8 Gd _0.2 ) ₃ Al ₅ O ₁₂ : Ce, Y _{3 (Al 0.8 Ga 0.2) 5 O} 12: Ce, and the like (Y, Gd) 3 (Al , Ga) YAG -based phosphor represented by the composition formula of _{5 O 12.} Further, there are Tb ₃ Al ₅ O ₁₂ : Ce, Lu ₃ Al ₅ O ₁₂ : Ce, etc. in which a part or all of Y is substituted with Tb, Lu, or the like.

Other phosphors include ZnS: Eu, Zn ₂ GeO ₄ : Mn, MGa ₂ S ₄ : Eu (M is at least one selected from Sr, Ca, Ba, Mg, Zn. X is At least one selected from F, Cl, Br, and I).

  The phosphor described above contains one or more selected from Tb, Cu, Ag, Au, Cr, Nd, Dy, Co, Ni, and Ti instead of Eu or in addition to Eu as desired. You can also.

The Ca—Al—Si—O—N-based oxynitride glass phosphor is expressed in terms of mol%, CaCO ₃ is converted to CaO, 20 to 50 mol%, Al ₂ O ₃ is 0 to 30 mol%, SiO 25 to 60 mol%, AlN 5 to 50 mol%, rare earth oxide or transition metal oxide 0.1 to 20 mol%, and oxynitride glass having a total of 5 components of 100 mol% as a base material This is a phosphor. In addition, in the phosphor using oxynitride glass as a base material, the nitrogen content is preferably 15 wt% or less, and other rare earth element ions serving as a sensitizer in addition to rare earth oxide ions are used as rare earth oxides. It is preferable to contain as a co-activator in content in the range of 0.1-10 mol% in fluorescent glass.

  Moreover, it is fluorescent substance other than the said fluorescent substance, Comprising: The fluorescent substance which has the same performance, an effect | action, and an effect can also be used.

<Light source>
In Embodiment 1, a mercury lamp, a solid-state laser, a semiconductor light emitting element, or the like can be used as the light source. When using a semiconductor light emitting element, specifically, as shown in FIG. 1A, a semiconductor light emitting element 122 is mounted on a metal package 121 having lead terminals, and light from the semiconductor light emitting element is received. An opening is provided so that the light can be emitted to the outside. Light emitted from the opening of the package is collected through the lens 140 and introduced into the light guide member 130 through the connector (terminal) 150. Here, for the sake of explanation, each component is illustrated separately, but the present invention is not limited thereto, and the lens and the connector may be incorporated in the package, and may be referred to as a light source.

(package)
In Embodiment 1, the material and shape of the package are not particularly limited, and a currently known package can be used. In particular, when a laser diode which is a kind of semiconductor light emitting device is used as the light source, it is preferable to use a metal package in consideration of light resistance, heat resistance, and weather resistance. In that case, since organic substances such as resin tend to be deteriorated, it is preferable not to use a resin for sealing the laser diode, and it is preferable to perform gas sealing. Furthermore, it is preferable that an opening is provided on the light emitting side so that the opening is covered with a member that is not easily deteriorated by light such as inorganic glass.

(Semiconductor light emitting device)
As a semiconductor light emitting element used as a light source, it is preferable to use a light emitting diode or a laser diode, and more preferably a laser diode. Thereby, light can be efficiently introduced into the light guide member.

A semiconductor light emitting device having an arbitrary wavelength can be selected. For example, as blue and green light emitting elements, those using ZnSe or a nitride semiconductor (In _X Al _Y Ga _1- XYN, 0 ≦ X, 0 ≦ Y, X + Y ≦ 1) are used. it can. As the red light emitting element, GaAs, InP, or the like can be used. Furthermore, a semiconductor light emitting element made of a material other than this can also be used. The composition, emission color, size, number, and the like of the light emitting element to be used can be appropriately selected according to the purpose.

In the case of a light-emitting device having a fluorescent material, a nitride semiconductor (In _X Al _Y Ga _1- XYN, 0 ≦ X, 0 ≦ Y, X + Y ≦ 1) is preferable. Various emission wavelengths can be selected depending on the material of the semiconductor layer and the degree of mixed crystal.

  Further, a light-emitting element that outputs not only light in the visible light region but also ultraviolet rays and infrared rays can be obtained. In addition to the semiconductor light emitting element, a light receiving element, a protective element (for example, a Zener diode or a capacitor) that protects the semiconductor element from destruction due to overvoltage, or a combination thereof can be mounted.

2. Embodiment 2
FIG. 2A shows the light-emitting device 200 according to Embodiment 2. 2B is an enlarged cross-sectional view of the optical component 210 used in the light emitting device of FIG. 2A. In the second embodiment, the conductive member provided in the light guide member and the conductive wire 231 provided separately from the conductive member are electrically connected via the translucent conductive member. Thus, by providing the conduction path as a separate member instead of the two-layer structure, a short circuit or the like can be made difficult to occur. Other configurations can be the same as those in the first embodiment.
(Conductive wire)
As the conductive wire, a member similar to the conductive member described in Embodiment Mode 1 can be used.

  As described in Embodiment 1, the holding member is provided at the emission side end of the light guide member. However, it is preferable that the leading end portion of the conductive wire is similarly protected by the holding member. For example, as shown in FIG. 2B, the light guide member 230 and the conductive wire 231 may be held by the same holding member 212, or may be held by separate holding members. For example, in the holding member with two holes, one is an optical fiber, one is a conductive wire, and the tip is positioned so that the end surface of the conductive wire is on the same plane as the end surface of the light guide member Therefore, it is preferable to perform surface matching by polishing or the like. Thereby, electrical connection with the translucent conductive member provided in the translucent member becomes easy. In addition, the optical fiber is preferably arranged at the center of the holding member, and by this, light from the light source can be irradiated to the center of the wavelength conversion member, so that color unevenness can be reduced.

  The light emitting device according to the present invention can detect the disconnection of the light guide member that transmits light from the semiconductor light emitting element more accurately. Therefore, it is possible to avoid a problem that light leaks from the disconnected portion, adversely affects other members, and in some cases damages the human body.

FIG. 1A is a diagram showing an example of a light emitting device according to the present invention. 1B is a cross-sectional view showing a configuration of the optical component in FIG. 1A. 1C is an enlarged cross-sectional view showing the optical component of FIG. 1B. FIG. 1D is a partial enlarged cross-sectional view of the optical component of FIG. 1C. FIG. 1E is a partially enlarged cross-sectional view of the optical component of FIG. 1B. FIG. 2A is a diagram showing an example of a light emitting device according to the present invention. 2B is an enlarged cross-sectional view showing the optical component of FIG. 2A. FIG. 3 is an enlarged cross-sectional view of an optical component according to the present invention.

Explanation of symbols

100, 200: Light emitting devices 110, 210, 310 ... Optical components 111, 211, 311 ... Flange 112, 212, 312 ... Holding members 114, 214, 314 ... Translucent conductive members 116, 216, 316 ... caps 117, 217, 317 ... translucent members 118, 218, 318 ... joining members 120, 220 ... light sources 121, 221 ... packages 122, 222 ... Semiconductor light emitting elements 130, 230, 330 ... light guide members 131a, 131b, 231 ... conductive member 132 ... insulating member 231 ... conductive wires 140, 240 ... lenses 150a, 150b, 250a, 250b ... Connector (detection member, terminal)

Claims (2)

A light source, a light guide member that is optically connected to the light source, a wavelength conversion member that is provided at an output-side end of the light guide member and converts the wavelength of light from the light source, and a disconnection of the light guide member. A light-emitting device comprising a detection member for detection,
The light guide member has at least two or more conductive members continuous on the surface from the light source side to the emission side,
The conductive member is in contact with at least a part of the wavelength conversion member, and is connected so as to be electrically connected to each other at an emission side end surface of the translucent member.   The said wavelength conversion member has a translucent conductive member which can permeate | transmit the light from the said light source, The said conductive member is connected so that it can mutually conduct | electrically_connect through this translucent conductive member. The light emitting device according to 1.

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