JP2016018744A - Illumination lamp and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination lamp which efficiently attains an outgoing beam having high uniformity, and to provide a lighting device.SOLUTION: An illumination lamp includes: a laser beam source 21 which emits a laser beam; a plate-like light guide part 30 to which the laser beam emitted from the laser light source 21 enters, the plate-like light guide part 30 which transmits the laser beam between a first surface 33A and a second surface 33B facing each other; a reflection part 32 which is provided at the first surface 33A side and reflects the laser beam to the second surface 33B side; a wavelength conversion part 34 which is provided at the second surface 33B side and converts a wavelength of the laser beam entered from the reflection part 32 side; and a cover 4 which transmits the beam converted by the wavelength conversion part 34.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an illumination lamp and an illumination device.

  Conventionally, for example, as shown in Patent Document 1 below, laser light emitted from a laser light source is diffused by a diffusing unit, and light diffused by the diffusing unit is incident on a wavelength converting unit to obtain emitted light. A light emitting device having a configuration is known. The light emitting device described in Patent Document 1 is configured so that uniform light can be emitted from the side surface of the light emitting device by changing the diffusivity of the diffusing section.

JP 2010-56003 A (5th to 6th pages, FIG. 2)

  However, the light-emitting device described in Patent Document 1 has a problem in that it cannot efficiently obtain emitted light. This is because, in the light emitting device of Patent Document 1, the laser light is diffused by the diffusing unit and applied to the phosphor of the wavelength conversion unit, and therefore the laser beam cannot be efficiently applied to the phosphor. As a result, in the light emitting device of Patent Document 1, the phosphor cannot be excited efficiently, and thus the emitted light cannot be obtained efficiently.

  Furthermore, in the light emitting device described in Patent Document 1, the laser beam diffused by the diffusion unit is irradiated to the wavelength conversion unit formed around the diffusion unit, and the emitted light is emitted from the emission surface around the wavelength conversion unit. Since it was the structure to obtain, it is difficult to emit light uniformly from an output surface.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an illumination lamp and an illumination device that can efficiently obtain emitted light with high uniformity.

  The illumination lamp of the present invention has a laser light source that emits laser light and a plate-like shape that receives the laser light emitted from the laser light source and propagates the laser light between the first surface and the second surface that face each other. The light guide part, the reflection part provided on the first surface side and reflecting the laser light on the second surface side, and the wavelength part of the laser light incident on the reflection surface side provided on the second surface side are converted. It has a wavelength conversion part and a cover which permeate | transmits the light converted by the wavelength conversion part, It is characterized by the above-mentioned.

  According to the present invention, since the laser light reflected by the reflecting portion on the first surface side is incident on the wavelength converting portion on the second surface side facing the first surface, for example, the phosphor of the wavelength converting portion is efficient. Excited well. Furthermore, the laser light propagated between the first surface and the second surface of the plate-like light guide is guided to the wavelength converter, and the light converted by the wavelength converter is transmitted through the cover to be emitted. Therefore, uniform emission light can be obtained. As a result, according to the present invention, it is possible to provide an illumination lamp and an illumination device capable of efficiently obtaining emitted light with high uniformity.

It is a perspective view of the illuminating device provided with the illumination lamp which concerns on Embodiment 1 of this invention. It is a perspective view of the illumination lamp of FIG. It is the schematic sectional drawing which described AA cross section of FIG. 2 roughly. It is the enlarged view to which the B section of FIG. 3 was expanded. It is the schematic sectional drawing which described CC section of FIG. 4 roughly. FIG. 6 is a schematic cross-sectional view schematically illustrating a DD cross section of FIG. 5. It is a block diagram of the illuminating device of FIG. It is a graph which shows an example of the characteristic of the light source unit and wavelength conversion part which are shown in FIG. It is the modification 1 of the block diagram described in FIG. It is the modification 1 of the illuminating device described in FIG. It is the schematic sectional drawing which described roughly the EE cross section of the part of the illumination lamp of the illuminating device shown in FIG. It is the schematic sectional drawing which described roughly the cross section (CC cross section of FIG. 4) of the illumination lamp which concerns on Embodiment 2 of this invention. It is a block diagram of the illumination lamp of FIG. It is the schematic sectional drawing which described roughly the cross section (DD cross section of FIG. 5) of the illumination lamp which concerns on Embodiment 3 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof is omitted or simplified as appropriate. Further, the size and arrangement of the configurations shown in the drawings can be appropriately changed within the scope of the present invention.

Embodiment 1 FIG.
FIG. 1 is a perspective view of an illumination device 600 including an illumination lamp 1 according to Embodiment 1 of the present invention. The illumination lamp 1 and the illumination device 600 according to this embodiment can efficiently obtain emitted light with high uniformity.

[Lighting device]
The lighting device 600 is attached to a ceiling, for example, via a fixture (not shown). The illumination device 600 includes a detachable illumination lamp 1 and a luminaire 500 that supplies power to the illumination lamp 1 to turn on the illumination lamp 1. When the illumination lamp 1 is turned on, light is irradiated to the floor, indoor space, and the like.

  The lighting fixture 500 includes a fixture main body 140 and a reflector 120 disposed on the upper side of the lighting lamp 1. The lighting fixture 500 includes a pair of sockets 100 that are electrically connected to the caps 5 (see FIG. 2) provided at both ends of the lighting lamp 1. The socket 100 also has a role of mechanically supporting the illumination lamp 1. The instrument main body 140 houses an AC-DC converter 130. The AC-DC conversion unit 130 supplies power to the illumination lamp 1 via the socket 100 when a switch (not shown) is switched to an ON state, and supplies power to the illumination lamp 1 when the switch is switched to an OFF state. It will stop.

[Lighting lamp]
FIG. 2 is a perspective view of the illumination lamp 1 shown in FIG. The illumination lamp 1 includes, for example, a cover 4 that is a cylindrical outer shell, a pair of caps 5 attached to both ends of the cover 4, and a lamp unit 7 (see FIG. 3) housed in the cover 4. ing. The illumination lamp 1 is a straight tube type that is long and has a cylindrical outer shape.

[cover]
The cover 4 is a cylindrical member formed so that the peripheral wall extends parallel to the longitudinal direction (arrow Y direction). The cover 4 houses the lamp unit 7 therein. The cover 4 has translucency and transmits light emitted from the lamp unit 7 to the outside. The cover 4 is obtained, for example, by extruding a resin material. As the resin material constituting the cover 4, for example, polycarbonate (PC) or acrylic (PMMA) is used.

  The cover 4 can have optical functions such as diffusion, reflection, and color rendering depending on the design specifications of the illumination lamp 1. For example, the cover 4 is formed of a resin material mixed with a diffusing material so as to be a milky white tube that diffuses and transmits light. In addition, as a material which comprises the cover 4, it is not limited to a resin material, For example, you may employ | adopt the hybrid type etc. with which glass etc. mixed in the glass tube or resin.

  The cover 4 may be configured to have a region where light is emitted at least partially. For example, the cover 4 is made of a translucent resin on the exit side of the illumination lamp 1 and the other part is made of a white highly reflective resin. Further, the cover 4 may be another cylindrical tube such as a rectangular tube or a semi-cylindrical section. Further, the cover 4 may be a plate-like member that covers only the emission side of the illumination lamp 1.

[Base]
The base 5 is attached to both ends of the cover 4. The base 5 is inserted into both sides of the socket 100 shown in FIG. When the base 5 is inserted into the socket 100, the lighting lamp 1 is mechanically supported by the lighting fixture 500 and is electrically connected to the lighting fixture 500. The base 5 may be a base such as a G13 type, but is not limited thereto, and other types of bases may be employed.

  As shown in FIG. 2, the base 5 includes a conductive power supply terminal 51 and an insulating base housing 50 in which the power supply terminal 51 is embedded. The power supply terminal 51 and the base casing 50 are integrally formed by, for example, insert molding.

  The power supply terminal 51 is made of, for example, a conductive metal, and the base casing 50 is made of, for example, an insulating resin material. The power supply terminal 51 is subjected to, for example, a plating process for preventing oxidation. When insulation between the base case 50 and the power supply terminal 51 is ensured, the base case 50 may be made of metal.

[Internal structure of lighting lamp]
Next, the internal configuration of the illumination lamp 1 will be described with reference to FIGS. 3 is a schematic cross-sectional view schematically showing the AA cross section of FIG. 2, FIG. 4 is an enlarged view of a portion B of FIG. 3, and FIG. 5 is a cross-sectional view of FIG. FIG. 6 is a schematic cross-sectional view schematically showing a cross section, and FIG. 6 is a schematic cross-sectional view schematically showing a DD cross section of FIG. 5. The illumination lamp 1 accommodates a heat dissipation unit 6 and a lamp unit 7 in an internal space covered with a cover 4 and a base 5.

[Lamp unit]
The lamp unit 7 includes a light source unit 2 and an optical unit 3. The light source unit 2 emits light toward the optical unit 3. The optical unit 3 emits the light incident from the light source unit 2 to the emission side of the illumination lamp 1.

[Light source unit]
The light source unit 2 emits light toward the optical unit 3 from both sides along the longitudinal direction (arrow Y direction) of the illumination lamp 1. The light source unit 2 is attached to the caps 5 installed at both ends of the cover 4, for example. For this reason, the light source unit 2 is positioned only by attaching the base 5 to the cover 4. The light source unit 2 arranged on one side of the illumination lamp 1 and the light source unit 2 arranged on the other side of the illumination lamp 1 are arranged so that the light emission directions face each other. An optical unit 3 is disposed between the light source units 2 disposed on both sides of the illumination lamp 1. Light emitted from the light source unit 2 enters the optical unit 3.

  The light source unit 2 includes a laser light source package 20 and a DC-DC converter 24 that are installed on a substrate 23. The board | substrate 23 is comprised with a rigid board | substrate or a flexible substrate, for example. The substrate 23 is connected to the power supply terminal 51 of the base 5 by a method such as soldering, and is electrically and mechanically connected to the base 5.

  On the substrate 23, electrode pads, wiring patterns, etc., not shown, are formed. As a material constituting the electrode pad and the wiring pattern, a metal having a small electrical resistance such as copper or aluminum is employed. On the substrate 23, for example, a white resist is applied to form a resist film portion. The resist film portion protects the wiring pattern and improves the insulation between the wirings. The resist film portion also has a function of reflecting light. Note that a reflection sheet for reflecting light may be attached to the substrate 23.

  The DC-DC converter 24 supplies driving power to the laser light source package 20. The DC-DC converter 24 is an electric circuit including an electronic component mounted on the substrate 23, for example. When power is supplied to the substrate 23 via the power supply terminal 51 of the base 5, the DC-DC converter 24 supplies drive power to the laser light source package 20.

[Laser light source package]
The laser light source package 20 is a laser light source that emits laser light. The laser light source package 20 is fixed by, for example, a method of soldering the lead terminals 20B on the electrode pads of the substrate 23. The plurality of laser light source packages 20 are arranged in a row in accordance with the shape of the incident end portion 31 of the optical unit 3. The laser light source package 20 is installed with a gap between the incident end 31 of the optical unit 3. Therefore, the heat of the laser light source package 20 is configured not to be transmitted to the optical unit 3. In the example of this embodiment, the laser light source packages 20 arranged in a straight line form a laser beam incident on the incident end 31 of the optical unit 3. One laser light source package 20 may be provided.

  The laser light source package 20 includes a laser light source 21 that emits laser light and a condenser lens 22 that condenses the laser light. The laser light source 21 is supplied with driving power from the DC-DC converter 24 and emits laser light. The laser light source 21 of this embodiment emits laser light in the blue band of about 400 to 480 nm, for example, but may emit laser light in other wavelength ranges. The laser beam condensed by the condenser lens 22 is emitted from the laser light source package 20 toward the incident end 31 of the optical unit 3. In the example of this embodiment, the laser light source package 20 has been described as having the condensing lens 22 that condenses the laser light. However, the optical unit 3 described later is optimized for the laser radiation angle. If so, the condenser lens 22 may be omitted. For example, when the laser light source package 20 is disposed close to the optical unit 3, the condensing lens 22 can be omitted.

  Note that, instead of the laser light source package 20 in which one semiconductor chip is packaged as illustrated, the semiconductor chip may be directly mounted on the substrate 23 such as a chip on board (COB). Alternatively, the semiconductor laser in which a plurality of semiconductor chips are packaged may be directly mounted on the substrate 23. Further, the number, arrangement, and type of the laser light source packages 20 can be appropriately changed according to the use of the illumination lamp 1 and the like. Further, instead of using the laser light source package 20, a configuration using another light source such as an LED light source package may be used.

[Optical unit]
The optical unit 3 is a long plate-like member that extends along the longitudinal direction (arrow Y direction) of the illumination lamp 1. The flat optical unit 3 has incident end portions 31 on both sides in the longitudinal direction. The optical unit 3 receives laser light from the incident end 31 and emits emitted light to the emission side of the illumination lamp 1.

  The optical unit 3 includes a light guide unit 30, a reflection unit 32, and a wavelength conversion unit 34. The reflection unit 32 and the wavelength conversion unit 34 are arranged to face each other with the light guide unit 30 in between. Specifically, the reflection unit 32 is disposed on the first surface 33A side of the light guide unit 30, and the wavelength conversion unit 34 is disposed on the second surface 33B side facing the first surface 33A of the light guide unit 30. In addition, reflective elements such as aluminum tape may be provided at both ends extending along the longitudinal direction of the optical unit 3 so that light does not leak from the both ends. Alternatively, the reflective element may be provided only at both end portions extending along the longitudinal direction of the light guide portion 30. In the case where reflection elements are provided at both end portions extending along the longitudinal direction of the light guide portion 30, a vapor deposition film such as aluminum can be formed at the corresponding location. The optical unit 3 according to this embodiment is a laminated member in which the reflection unit 32, the light guide unit 30, and the wavelength conversion unit 34 are integrally laminated. The optical unit 3 may be configured such that the light guide unit 30, the reflection unit 32, and the wavelength conversion unit 34, which are individually configured, are integrally laminated. Further, the wavelength conversion unit 34 may be disposed away from the light guide unit 30.

  The light guide unit 30 is a plate-like member formed of a light-transmitting material such as acrylic (PMMA), polycarbonate (PC), or glass. Incident end portions 31 are formed on both sides of the light guide 30 in the longitudinal direction. The incident end portion 31 is formed, for example, as a flat surface or a curved surface so that light from the light source unit 2 can be efficiently incident. A structure pattern may be formed on the incident end 31 so that laser light incident from one side of the light guide 30 does not enter the light source unit 2 on the other side.

  Light incident from the incident end 31 is propagated along the longitudinal direction of the light guide 30. That is, the light incident from the incident end 31 is guided while being repeatedly reflected between the first surface 33A on the heat radiating unit 6 side of the light guide unit 30 and the second surface 33B facing the first surface 33A. It propagates in the longitudinal direction of the part 30.

  The reflection unit 32 is, for example, a convex structure pattern formed on the first surface 33 </ b> A side of the light guide unit 30. When the light propagated in the longitudinal direction of the light guide unit 30 enters the convex reflection unit 32, it is reflected by the curved surface. At this time, light that does not satisfy the total reflection condition at the interface of the light guide 30 is generated, and the light travels toward the second surface 33B of the light guide 30. The light reflected by the reflection unit 32 passes through the second surface 33B and enters the wavelength conversion unit 34.

  The arrangement density of the structural pattern of the reflection part 32 formed on the first surface 33 </ b> A side of the light guide part 30 changes according to the position with respect to the light source unit 2. For example, according to the position with respect to the light source unit 2, the number or size per unit area of the structural pattern of the reflection unit 32 is changed, or the shape is changed, so that the second surface 33B of the light guide unit 30 is changed. The light quantity distribution in the longitudinal direction (Y direction) of the emitted light is made uniform. In addition, the structural pattern of the reflection part 32 is not limited to a convex shape. In other words, the structure pattern of the reflecting portion 32 may be a prism shape, a random uneven pattern shape, or the like. The structural pattern of the reflecting portion 32 can be formed by appropriately selecting a method such as press molding, punching, cutting, sand blasting or the like according to the shape. In addition, the reflecting portion 32 having a diffusing function may be formed on the first surface 33 </ b> A side of the light guide portion 30.

  Further, the thickness distribution of the optical unit 3 may be adjusted so as to make the light quantity distribution of light uniform. In addition, the light guide unit 30 may be formed of a plurality of layers having different refractive indexes so as to adjust the total reflection condition of the light guide unit 30 to make the light quantity distribution of light uniform. The plurality of layers of the light guide unit 30 are formed of different materials, for example, or formed by adding germanium (Ge), phosphorus (P), or the like to a substrate of the same material. The reflection unit 32 reflects not only the laser light propagating through the light guide unit 30 but also the light emitted from the wavelength conversion unit 34.

  A wavelength conversion unit 34 is disposed on the second surface 33 </ b> B side of the light guide unit 30. The wavelength converter 34 converts the wavelength of the laser light emitted from the second surface 33B. The wavelength conversion unit 34 is, for example, a fluorescent unit including a phosphor. The wavelength conversion unit 34 receives the laser light emitted from the second surface 33B, emits light at a wavelength different from the laser light, and transmits the laser light. .

  The blue laser light incident on the wavelength converter 34 is irradiated on the phosphor of the wavelength converter 34 to be converted into yellow light, and passes through the wavelength converter 34 while being appropriately scattered. As a result, light of a desired color temperature (for example, white) can be obtained by mixing blue laser light and yellow fluorescence. That is, the wavelength converter 34 emits light in which laser light having a blue band wavelength and yellow fluorescence emitted from the wavelength converter 34 when excited by the laser light having a blue band wavelength are mixed. At this time, speckle noise of the blue laser light is reduced in the coherence due to scattering in the wavelength conversion unit 34, so that speckle noise of the light emitted from the wavelength conversion unit 34 is reduced.

  The wavelength converter 34 is formed, for example, by mixing phosphors such as YAG, silicate, casoon, sialon, and thiogallate in an epoxy resin or a silicone resin. In the example of this embodiment, the wavelength conversion unit 34 is a phosphor layer formed by being applied to the second surface 33 </ b> B of the light guide unit 30. In the wavelength conversion unit 34, phosphors are uniformly dispersed. The phosphor of the wavelength converter 34 is excited by blue laser light and emits light having a yellow wavelength. The blue laser light and yellow fluorescence are mixed, and the white light emitted from the wavelength converter 34 is diffused by the cover 4 and emitted from the illumination lamp 1.

[Optical unit holding structure]
The optical unit 3 is held on the cover 4 by a support portion 43 formed inside the cover 4. The support portions 43 are grooves formed at two locations on the inner surface 41 of the cover 4. The groove that constitutes the support portion 43 is formed along the longitudinal direction of the cover 4, and an end portion parallel to the longitudinal direction of the optical unit 3 is inserted.

  When the end portion parallel to the longitudinal direction of the optical unit 3 is inserted into the support portion 43, the movement in the direction other than the longitudinal direction is restricted and is reliably supported in the cover 4. The support portion 43 is formed with a positioning portion (not shown) for positioning the position along the longitudinal direction of the optical unit 3. For example, the position of the optical unit 3 in the longitudinal direction is regulated by positioning the optical unit 3 at the positioning portion and then bonding the optical unit 3 to the cover 4.

  Since the optical unit 3 is preferably disposed at a position including the center of the cover 4, the optical unit 3 can be enlarged. Moreover, since the space | interval between the optical unit 3 and the light-projection surface of the cover 4 can be separated, the big diffusion effect can be acquired. Furthermore, the optical unit 3 has a flat plate shape, and the light exit surface of the cover 4 has a cylindrical shape. At the center position where the light is strongly irradiated along the short direction of the optical unit 3, the distance between the optical unit 3 and the exit surface of the cover 4 is large, so that a large diffusion effect can be obtained. As a result, uniform light can be emitted from the outer surface 40 of the cover 4.

[Heat dissipation unit]
The heat dissipation unit (heat sink) 6 is disposed between the pair of caps 5 and extends along the longitudinal direction of the illumination lamp 1. The heat dissipation unit 6 has uneven fins 61 and has a large surface area. Screw mounting portions 60 are formed at both ends of the heat dissipation unit 6. Further, a screw attachment portion (through hole) 52 is formed in the base 5. The screw mounting portion 60 of the heat radiating unit 6 and the screw mounting portion 52 of the base 5 are positioned so as to be aligned with each other, and are screwed with screws 8. The heat radiating unit 6 is installed in the reflecting portion 32 of the optical unit 3 with a gap from the reflecting portion 32 so that the heat of the heat radiating unit 6 is not directly transmitted to the optical unit 3. For example, after the base 5 and the heat dissipation unit 6 are screwed, the adhesive member 9 is filled between the base 5 and the cover 4.

  Since the heat dissipation unit 6 extends from one end side of the cover 4 to the other end side and is attached to the base 5, deformation of the cover 4 and the optical unit 3 installed on the cover 4 is suppressed. Moreover, since the heat radiating unit 6 is enlarged, heat generation of the light source unit 2 can be suitably suppressed.

  Operating heat generated from the laser light source 21 is transmitted to the heat radiating unit 6 through the substrate 23, and is emitted from the cover 4 and the base 5 to the outside of the illumination lamp 1. Note that a holder 20 </ b> A that also serves as a heat dissipation plate may be erected from the substrate 23 so as to promote heat dissipation. The holder 20A is formed of a material having thermal conductivity, and is formed of a metal material such as iron, aluminum, or an alloy containing these. The holder 20A is obtained, for example, by extruding a metal material. In addition, the holder 20A may be made of a highly heat conductive resin or the like mixed with a ceramic having heat conductivity or a heat conductive filler. Further, in order to increase the thermal conductivity between the substrate 23 and the heat dissipation unit 6, for example, a heat conductive resin may be filled between the substrate 23 and the heat dissipation unit 6.

  The heat dissipation unit 6 is formed of a material having thermal conductivity, and is formed of, for example, a metal material such as iron, aluminum, or an alloy containing these. The heat dissipation unit 6 is obtained, for example, by extruding a metal material. Further, the heat dissipation unit 6 may be made of a highly heat conductive resin or the like mixed with a ceramic having heat conductivity or a heat conductive filler.

  The heat dissipation unit 6 and the holder 20A may be integrally formed in a U-shape. By doing in this way, since the operating heat of the laser light source 21 is more efficiently transmitted to the heat radiating unit 6, the operating temperature of the laser light source 21 can be suppressed, and the reliability of the illumination lamp 1 is improved. be able to.

  In addition, a reflective sheet is affixed on the main surface 62 of the heat radiating unit 6 or a reflective paint is applied to form a reflective surface. The light emitted toward the heat radiating unit 6 is reflected by the main surface 46 of the heat radiating unit 6 and enters the optical unit 3. Alternatively, an insulating layer and a circuit pattern are formed on the main surface 62 of the heat dissipation unit 6, and the laser light source package 20, the DC-DC conversion unit 24, and the like are mounted.

  FIG. 7 is a block diagram of the illumination device 600 shown in FIG. The AC voltage input from the AC power source is input to the AC-DC conversion unit 130 of the instrument main body 140. The AC-DC conversion unit 130 is configured by an electric circuit, and rectifies an input AC voltage and converts it into a DC voltage. The DC voltage converted by the AC-DC conversion unit 130 is input to the DC-DC conversion unit 24 via the power supply terminal 51 of the base 5 of the illumination lamp 1 attached to the socket 100. The DC-DC converter 24 is, for example, an electric circuit that performs DC-DC conversion, and outputs DC power that drives the laser light source 21.

[Phosphor emission]
FIG. 8 is a graph illustrating an example of characteristics of the light source unit 2 and the wavelength conversion unit 34 illustrated in FIG. Since the wavelength A of the blue laser light emitted from the light source unit 2 is close to the peak of the excitation spectrum B of the phosphor of the wavelength converter 34, the phosphor of the wavelength converter 34 can be excited efficiently. Further, since the laser light emitted from the light source unit 2 is light having a single wavelength, it can be mixed with the wavelength of the fluorescence emitted from the phosphor to obtain light having a desired color temperature. In FIG. 8, C is the fluorescence spectrum C of the phosphor of the wavelength conversion unit 34.

[Effect of illumination lamp according to Embodiment 1]
As described above, in the illumination lamp according to this embodiment, the laser light incident from the incident end of the light guide is propagated between the first surface and the second surface facing each other. Light can be propagated efficiently. And since the light which propagated to the light guide part is reflected by the reflection part and entered into the wavelength conversion part, laser light can be efficiently incident on the wavelength conversion part. For example, the reflecting portion is a convex structure pattern, and light can be emitted from the second surface of the light guide portion with a uniform light amount distribution.

  All of the laser light incident on the wavelength conversion unit from the second surface of the light guide unit does not irradiate the phosphor of the wavelength conversion unit, but passes through the wavelength conversion unit while appropriately scattering. As a result, laser light and fluorescence are mixed and light having a desired color temperature is emitted from the wavelength conversion unit. At this time, the laser light is scattered inside the wavelength conversion unit and emitted to the outside with reduced coherence, so that speckle noise peculiar to the laser light is suppressed. The light emitted from the wavelength conversion unit passes through the cover, becomes uniform light, and is irradiated to the irradiation target. Thus, in an illuminating device including the illumination lamp according to this embodiment, it is possible to efficiently obtain emitted light with high uniformity.

[Lighting lamp modification 1]
FIG. 9 is a first modification of the block diagram shown in FIG. In the modification shown in FIG. 9, the AC voltage input from the AC power source is input to the AC-DC converter 24 </ b> A via the power supply terminal 51 of the base 5 of the illumination lamp 1 attached to the socket 100. The AC-DC conversion unit 24 </ b> A of the illumination lamp 1 is an electric circuit that performs AC-DC conversion, for example, and outputs DC power that drives the laser light source 21. Thus, in this modification 1, since the AC-DC conversion part 24A is arrange | positioned at the illumination lamp 1, the AC-DC conversion part 130 of the instrument main body 140 shown in FIG. 1 is omissible. . That is, the workability of the instrument body 140 can be improved.

[Modification 1 of Lighting Device]
FIG. 10 shows a first modification of the lighting device 600 shown in FIG. 11 is a schematic cross-sectional view schematically showing an EE cross section of the portion of the illumination lamp 1A of the illumination device 600A shown in FIG. In the example shown in FIG. 1, the example in which the detachable straight tube type illumination lamp 1 is attached to the luminaire 500 has been described. However, the illumination lamp 1A of the first modification is integrally formed with the luminaire 500A. It is a direct attachment type. The cover 4A of the illumination lamp 1 is formed with a gentle curved surface on the light emission side. The cross-sectional shape of the cover 4A is formed in a substantially bowl shape. Inside the cover 4A, the light source unit 2, the optical unit 3, the heat radiation unit 6, and the like are accommodated. The shapes of the illumination device and the illumination lamp are not limited to the above shapes, and can be selected as appropriate.

Embodiment 2. FIG.
The second embodiment is different from the first embodiment only in the arrangement of the laser light source package 20 and the DC-DC conversion unit 24. In the following description, the description overlapping with the first embodiment will be omitted.

  FIG. 12 is a schematic cross-sectional view schematically showing a cross-section (CC cross-section in FIG. 4) of the illumination lamp 1B according to this embodiment. FIG. 13 is a block diagram of the illumination lamp 1B described in FIG.

  As shown in FIG. 12, in this embodiment, the laser light source package 20 attached to the base 5 on one end side and the laser light source package 20 attached to the base 5 on the other end are arranged with their optical axes shifted. ing. For this reason, in this embodiment, for example, it is possible to obtain emitted light with high uniformity while reducing the number of laser light source packages 20. Alternatively, it is possible to obtain emitted light with high uniformity by arranging the gaps between the adjacent laser light source packages 20 to be narrowed.

  Further, in this embodiment, the DC-DC converter 24 is installed only on the base 5 side on one end side. In this embodiment, as shown in FIG. 13, the laser light source 21 attached to the base 5 on one end side and the laser light source 21 attached to the base 5 on the other end are driven from one DC-DC converter 24. A laser beam is emitted upon receiving power. With this configuration, the number of DC-DC converters 24 can be reduced and the number of assembly steps can be reduced, so that the material cost and manufacturing cost of the illumination lamp can be reduced.

Embodiment 3 FIG.
In Embodiment 1, the optical unit 3 is a flat plate, but the optical unit 3A according to this embodiment has a bent shape. In the following description, the description overlapping with the first embodiment will be omitted.

  FIG. 14 is a schematic cross-sectional view schematically showing a cross section (DD cross section of FIG. 5) of the illumination lamp 1 according to this embodiment. In this embodiment, the optical unit 3A is formed to have a curved surface. That is, the optical unit 3A according to this embodiment has a shape in which the central portion in the short direction of the optical unit 3A is curved so as to protrude in the direction in which the light of the optical unit 3A is emitted.

  Since the optical unit 3A of this embodiment has a curved shape, the optical unit 3A can be formed in a large size. Moreover, in the optical unit 3A of this embodiment, since the emitted light emitted from the curved surface of the optical unit 3A uniformly irradiates the inner surface 41 of the cover 4, the illumination lamp 1 can irradiate uniform light. it can.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. That is, the configuration of the above embodiment may be improved as appropriate, or at least a part of the configuration may be replaced with another configuration. Further, the configuration requirements that are not particularly limited with respect to the arrangement are not limited to the arrangement disclosed in the embodiment, and can be arranged at a position where the function can be achieved.

  For example, in the above description of the embodiment, an explanation has been given of an illumination lamp elongated in the longitudinal direction. However, the illumination lamp of the present invention is an illumination lamp of another shape such as a square or a circle. Also good. For example, in the case of a square or circular illumination lamp, a light source unit may be disposed on the entire surface in the circumferential direction, and light may be incident from the entire surface in the circumferential direction.

  In the above embodiment, an example in which light source units are arranged on both sides of the light guide in the longitudinal direction and light is incident from both sides of the light guide is described. The light may be incident on the light guide unit. In this case, for example, a reflection element that reflects light is provided at the other end of the light guide portion on the side opposite to the one end side where the light source unit is disposed, and the light leaks from the other end side. Is preventing. The reflective element is formed by attaching a reflective sheet to the light source unit or forming a deposited film such as aluminum.

  Further, at least one of the laser light source packages may be installed so that the laser light is incident on the incident end portion of the light guide unit at different angles. For example, adjacent laser light source packages may be installed so that laser light is incident on the incident end of the light guide at different angles. Thus, by installing the laser light source package, the optical unit can emit uniform light.

  In the above description, the wavelength conversion unit includes a yellow phosphor and emits yellow fluorescence. However, the present invention is not limited to this. For example, the wavelength conversion unit includes a green phosphor and a red phosphor, and emits yellow fluorescence in which green fluorescence and red fluorescence are mixed. Or a wavelength conversion part emits yellow fluorescence combining the fluorescence of a some wavelength.

  In the above description, the configuration in which white light is obtained by combining blue laser light and yellow fluorescence has been described. However, a desired combination of laser light and wavelength-converted light emitted from the wavelength conversion unit is desired. You can get the light of the color.

  1 illumination lamp, 1A illumination lamp, 1B illumination lamp, 1C illumination lamp, 2 light source unit, 3 optical unit, 3A optical unit, 4 cover, 4A cover, base, 6 heat dissipation unit, 7 lamp unit, 8 screw, 9 bonding Member, 20 laser light source package, 20A holder, 20B lead terminal, 21 laser light source, 22 condenser lens, 23 substrate, 24 DC-DC converter, 24A AC-DC converter, 30 light guide, 31 incident end, 32 Reflection part, 33A 1st surface, 33B 2nd surface, 34 Wavelength conversion part, 40 Outer surface, 41 Inner surface, 43 Support part, 46 Main surface, 50 Base housing, 51 Feed terminal, 52 Screw mounting part, 60 Screw mounting Part, 61 fin, 62 main surface, 100 socket, 120 reflector, 130 AC-DC conversion part, 140 Appliance main body, 500 lighting fixture, 500A lighting fixture, 600 lighting device, 600A lighting device, A laser light wavelength, B excitation spectrum, C fluorescence spectrum.

Claims (13)

A laser light source for emitting laser light;
A plate-shaped light guide portion that receives the laser light emitted from the laser light source and propagates the laser light between a first surface and a second surface facing each other;
A reflecting portion provided on the first surface side and reflecting the laser beam on the second surface side;
A wavelength conversion unit that is provided on the second surface side and converts the wavelength of the laser light incident from the reflection unit side;
An illumination lamp comprising: a cover that transmits light converted by the wavelength conversion unit.   The illumination lamp according to claim 1, wherein the wavelength conversion unit is a fluorescent unit that receives the laser light and emits light in a wavelength region longer than the laser light.   The illumination lamp according to claim 1 or 2, wherein the optical unit in which the reflection unit, the light guide unit, and the wavelength conversion unit are integrally formed is attached to the cover. Further having a base attached to both ends of the cover;
The illumination lamp according to any one of claims 1 to 3, wherein the laser light source is attached to the base. Further extending from the one end side of the cover to the other end side, further having a heat dissipation unit attached to the base,
The illumination lamp according to claim 4, wherein a gap is provided between the heat dissipation unit and the reflection portion.   6. The illumination lamp according to claim 5, wherein the heat radiating unit is formed with a reflecting surface that reflects light on the wavelength conversion unit side.   The illumination lamp according to claim 4, wherein the laser light source is attached to each of the caps.   The illumination lamp according to claim 7, wherein the laser light source on one end side of the cover and the laser light source on the other end side of the cover are installed with their optical axes shifted.   The illumination lamp according to any one of claims 1 to 8, wherein the laser light sources are arranged in a line along an incident end of the light guide.   10. At least one of the laser light sources is installed so that the laser beam is incident on the incident end of the light guide at a different angle. The illumination lamp according to item.   The illumination lamp according to any one of claims 1 to 10, wherein the cover is formed in a cylindrical shape.   The illumination lamp according to any one of claims 1 to 11, wherein the illumination lamp is a straight tube illumination lamp that is long and has a cylindrical outer shape.   An illumination apparatus comprising the illumination lamp according to any one of claims 1 to 12.

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