JP5473966B2 - Light source unit and lighting device - Google Patents

Description

  The present invention relates to an illumination device that uses a semiconductor light emitting element such as a light emitting diode (LED; Light Emitting Diode) as a light source, and a light source unit that can be incorporated therein.

  For the purpose of adjusting or limiting the illumination range (illumination area) of an illumination device, many proposals have been made on structures that use a reflector and a lens system to control the light distribution angle and beam angle. Among them, prior art examples using LEDs having features such as small size and long life as light sources are disclosed in Patent Documents 1 to 3, for example.

  Patent Document 1 describes that, for example, an effect of easily creating a desired light distribution characteristic can be obtained by selectively attaching a lens body to a plurality of reflective recesses provided around each LED.

  Patent document 2 shows the illuminating device provided with the several lens which has a condensing function, and the convex lens array arrange | positioned so that LED opposing side may become a plane. Since this illumination device is guided to the same location so that the light from the LEDs is superimposed on each other, it has an effect of illuminating a predetermined spatial region with extremely high luminance.

  Patent Document 3 is an illumination device including a plurality of LEDs having a condensing function and a convex lens array, as in Patent Document 2. In this illuminating device, an example in which the lens convex surface is arranged to face the LED is shown, and it is assumed that the prescribed light distribution characteristics as a tail lamp and a stop lamp are satisfied.

JP 2009-9826 A Patent No. 4488183 (Japanese Patent Laid-Open No. 2005-285697) Japanese Patent Application No. 2-214052

  However, since Patent Document 1 includes a reflector having a plurality of concave portions, there is a limit to the number of LEDs that can be used, and in particular, when the necessity of increasing the luminous flux arises, the number of LEDs can be easily adjusted (especially Increase). Further, the LED arrangement position is limited to the reflector recess position, and there is a problem that it cannot be arbitrarily adjusted according to the number of LEDs. Furthermore, this reflective concave portion has led to an increase in the cost of the apparatus.

  On the other hand, compared with the configuration of Patent Document 1, Patent Document 2 can easily cope with adjustment of the number of LEDs. However, since the convex portion of the convex lens array is directed to the device surface side, there is a problem that when the device light-emitting surface is viewed, shadows of a plurality of convex surfaces are likely to appear and the light appears uneven. In addition, there is a problem in terms of design and maintainability such that dust easily collects between the convex portions and needs to be thinly cleaned.

  In addition, since Patent Documents 2 and 3 use a resin mold LED such as a shell type having a condensing function, the thickness of the apparatus is increased, and such an LED is further condensed by a convex lens array. When used in applications, there is a drawback that unpleasant glare (very dazzling) and large luminance unevenness (or uneven illuminance) are likely to occur.

  Therefore, the present invention makes it easy to change the number of LEDs, and when it is necessary to adjust the luminous flux according to the application, it can flexibly respond to the change in the number of LEDs, and is thin with excellent design and maintainability. It is an object to obtain a light distribution control lighting device that is inexpensive and inexpensive. As for the light distribution of the device, the light distribution is lightly narrowed with a low glare with a beam angle of about 40 to 60 degrees and with little unevenness of brightness by simply attaching and detaching optical components (lens array), and diffusivity at a wider angle than that. The purpose is to switch the light distribution. The beam angle described in the following embodiment is an irradiation angle (both angles straddling the center) that is ½ luminous intensity of the luminous intensity in the center direction of the apparatus.

The light source unit of the present invention is
A base part;
A plurality of LEDs that emit emitted light with a predetermined light distribution characteristic are mounted on one surface serving as a mounting surface, and an LED mounting substrate that is fixed to the base portion;
It has a lens function part corresponding to each LED of the plurality of LEDs and emitting incident light with a narrow light distribution characteristic that is narrower than the light distribution characteristic of the corresponding LED, A lens array that is fixed to the base portion so as to face the mounting surface of the LED mounting substrate so that the lens function portion of the LED faces the corresponding LED,
A translucent light diffusing member that is fixed to the base portion on the opposite side of the LED mounting substrate with respect to the lens array, and transmits and diffuses light emitted from the lens function portions of the lens array. It is characterized by that.

  According to the light source unit of the present invention, since the light is condensed by the lens array and the light emitted from the lens array is transmitted through the diffusible light transmitting member, the light distribution unit has a narrow light distribution characteristic with little optical noise and less color unevenness. A light source unit can be provided.

FIG. 3 shows a lighting device 100 using the light source unit 10 of the first embodiment. The figure which shows the front view, sectional drawing, etc. of the light source unit 10 of Embodiment 1. FIG. FIG. 3 shows a basic configuration of a light source unit 10 according to the first embodiment. The figure which shows the curve of the translucent light-diffusion member 6 of Embodiment 1. FIG. 1 is a cross-sectional view of a light source unit 10 (with a lens array 4) and a lighting device using the light source unit 10 according to a first embodiment. 1 is a cross-sectional view of a light source unit 10 (with a lens array 4) and a lighting device using the light source unit 10 according to a first embodiment. FIG. 3 shows a simulation model for the light source unit 10 of the first embodiment. FIG. 3 shows a simulation model for the light source unit 10 of the first embodiment. The figure which shows the light distribution characteristic of LED used for the simulation of the light source unit 10 of Embodiment 1. FIG. Sectional drawing of the simulation model of only the "LED board | substrate 2" of Embodiment 1, and the structural condition of "LED board | substrate 2 + lens array 4." Sectional drawing of the simulation model of the structural condition of "LED board | substrate 2 + lens array 4 + translucent light diffusion member 6" and "LED board 2" + translucent light diffusion member 6 of Embodiment 1. FIG. The figure which shows the simulation result by the difference in the structure of FIG. 10, FIG. Sectional drawing of the simulation model of the structural conditions from which the focal distance F 'of Embodiment 1 differs. The figure which shows the simulation result by the difference in the focal distance F 'of FIG. Sectional drawing of the simulation model of the structural conditions from which distance d of the LED light emission surface of Embodiment 1 and the peak of the lens function part 5 differs. The simulation result from which the distance d of FIG. 15 differs. FIG. 5 shows an LED thinning-out state according to the second embodiment. FIG. 6 shows a thinned-out portion of the second embodiment. The figure which shows the conductive pattern of the broken line frame 51 of FIG. Sectional drawing which shows the attachment position of the color conversion member 18 of Embodiment 3. FIG. FIG. 10 is another cross-sectional view showing the mounting position of the color conversion member 18 according to the third embodiment. FIG. 10 is still another cross-sectional view showing the mounting position of the color conversion member 18 according to the third embodiment. FIG. 10 is a diagram illustrating characteristics of color conversion (wavelength conversion) by the color conversion unit 19 according to the third embodiment. The figure which shows the case where the lens function part 5 of Embodiment 4 is shifted to radial direction. The figure which shows the case where the lens function part 5 of Embodiment 4 is shifted to the left-right direction. The figure which shows the case where the lens array 4 is rotated and fixed to the circumferential direction of a concentric circle with respect to LED mounted on the substantially concentric circle of Embodiment 4. FIG. The figure which shows the light emission angle direction and color temperature of LED (NS6W183 by Nichia Corporation) of Embodiment 4. FIG. FIG. 6 shows a lens array fixing portion 7 of the lens array 4 of Embodiment 4. FIG. 10 shows another reduction means for color misregistration according to the fourth embodiment.

Embodiment 1 FIG.
First, the first embodiment will be described with reference to FIGS.

  FIG. 1 shows an illumination device 100 using the light source unit 10 of the first embodiment. The light source unit 10 described in the first embodiment includes an LED substrate 2 (LED mounting substrate), a reflective fixing member 3 (base portion), a lens array 4, and a translucent light diffusing member 6. The illuminating device 100 of FIG. 1 is a structure provided with the light source unit 10 and the outer reflective housing 8. FIG. 1A is an exploded perspective view of the lighting device 100. (B) of FIG. 1 is the figure which looked at the state which combined the reflective fixing member 3 with the LED board 2 from the upper surface (LED mounting surface 2a side). FIG. 1C shows a configuration in which four lens array fixing portions 7 indicated by broken lines are provided around the lens array 4 so as to prevent displacement of the lens array 4 with respect to the reflective fixing member 3. The lens array 4 is fitted to the reflective fixing member 3 by the lens array fixing portion 7.

FIG. 2 shows the configuration of the light source unit 10. 2A is a view of the light source unit 10 viewed from above (X direction in FIG. 1).
FIG. 2B shows an AA cross section of FIG. FIG. 2C is a top view of the lens array 4 of the light source unit 10 (as viewed in the X direction in FIG. 1 in FIG. 1).
In FIG. 2B, the light emitting surface is drawn downward in accordance with most usage patterns of the light source unit 10 in the embodiment described below. Note that the “light emitting surface” when referred to as the light emitting surface of the light source unit 10 or the light emitting surface of the illumination device 100 means the surface of the translucent light diffusing member 6 (the side from which light is emitted). Although the light source unit 10 itself may be functionally considered as a lighting device, in the following embodiment, the description will be made using the name of the light source unit 10. That is, when referring to the “light source unit 10” in the following embodiment, the light source unit 10 (comprising the LED substrate 2, the reflective fixing member 3, the lens array 4, and the translucent light diffusing member 6) shown in FIG. Means. Further, in the following embodiment, the “illumination device 100” refers to a device in which the light source unit 10 is further provided with an outer reflective housing 8 as shown in FIG.

  As shown in FIGS. 1 and 2, the light source unit 10 includes an LED substrate 2 on which a plurality of LEDs 1 are mounted, and an upper portion around the LED substrate 2 (the upper or upper direction is the light emission direction side of the mounted LED. The reflective fixing member (base portion) 3 and the reflective fixing member 3 are arranged so as to fix the LED substrate 2 to the normal line 2L (shown in FIGS. 3 and 4) of the mounting surface 2a. The lens array 4 disposed opposite to the LED array light emitting surface side (LED substrate mounting surface 2a side) inside, and further, the translucent light diffusing member 6 disposed at a distance from the light emitting surface side of the lens array 4. It is the structure provided with.

  FIG. 3 is a simplified diagram of the configuration of the light source unit 10. The aim of the configuration of the light source unit 10 is that the light 71 is once narrowed (emitted light 72) by the lens function unit 5 of the lens array 4 and further transmitted through the translucent light diffusing member 6, so that it is slightly wider. It is to return to the light distribution (emitted light 73). Thus, when the lens array 4 is mounted, an optical noise generated particularly on the wide-angle side is canceled out, and a characteristic function for suppressing luminance unevenness and glare of the light source unit 10 is obtained.

(Basic configuration of the light source unit 10)
As shown in FIGS. 1 to 3, the light source unit 10 includes a reflective fixing member 3, an LED substrate 2, a lens array 4, and a translucent light diffusing member 6. The LED substrate 2 is mounted with a plurality of LEDs (Light Emitting Diodes) that emit emitted light with a predetermined light distribution characteristic on one surface serving as a mounting surface 2a (FIG. 1). The LED substrate 2 is fixed to the reflective fixing member 3. The lens array 4 corresponds to each LED of a plurality of LEDs and has a plate-like body having a lens function unit 5 that emits incident light with a narrow light distribution characteristic that is narrower than the light distribution characteristic of the corresponding LED. It is. As shown in FIG. 2B, the lens array 4 is fixed to the reflective fixing member 3 so as to face the mounting surface 2a of the LED substrate 2 so that each lens function unit 5 faces the corresponding LED. The translucent light diffusing member 6 is fixed to the reflective fixing member 3 on the opposite side of the LED substrate 2 with respect to the lens array 4 as shown in FIG. The translucent light diffusing member 6 has a function of transmitting and diffusing light emitted from each lens function unit 5 of the lens array 4.
As will be described later, when the focal length F ′ of the focal point on the LED substrate 2 side of the lens function unit 5 is set, the focal length F ′, the light emitting surface 1a of the LED, and the convexity of the lens function unit 5 corresponding to this LED About the distance d with the summit 4c of the part 4b,
F ′ <d
Consists of the following conditions.

(LED1)
The LED 1 is, for example, a commercially available thin surface-mounted LED. The LED 1 has a configuration in which a blue LED chip is mounted in an LED package material including electrodes, and the surface is sealed with a phosphor mixed resin that is excited by the blue light, and emits white light.

(LED board 2)
Further, the LED substrate 2 is made of, for example, a metal substrate based on aluminum or copper, a ceramic substrate, or the like for the purpose of suppressing a decrease in light emission efficiency due to a temperature rise of the LED. If the LED temperature rise is not so large, the LED substrate 2 may be configured using a material such as a glass epoxy substrate or a glass composite substrate in consideration of cost. In order to improve the light utilization efficiency in the light source unit 10, the surface of these substrates may be a surface processed with a highly reflective white paint or the like.

(Reflective fixing member 3)
The reflective fixing member 3 fixes the LED substrate 2 and further has a role of positioning the lens array 4 and the translucent light diffusing member 6. The reflective fixing member 3 is configured such that at least the surface thereof has high reflectivity because light is incident on the inner slope of the member. For example, it is made of a resin material, and a highly reflective paint is applied to the surface or a highly reflective optical sheet is attached. Or you may comprise with a metal body and vapor-deposit surface plating or a metal thin film. Alternatively, it may be integrally molded with a resin material such as highly reflective polycarbonate and the surface polished.

(Lens array 4)
Next, in the lens array 4, a lens function unit 5 that gives a condensing effect to the light emitted from the LEDs 1 is arranged to face the individual LEDs 1, and the plurality of lens function units 5 are provided as an array. The lens array 4 is configured as a member. The lens array 4 may be a glass material or a transparent resin material such as acrylic. If the lens function unit 5 has a light condensing function, it functions as a narrow light distribution function. However, depending on the purpose, for example, when emphasizing the thinning of the lens array 4 itself, a Fresnel lens shape or molding When emphasizing the performance and cost, a convex lens shape can be selected and prepared.

  In the first embodiment, the objective is to obtain an inexpensive light source unit or lighting device, and the description will focus on the case where the lens function part 5 whose lens mold manufacturing cost is relatively inexpensive is a convex lens. To do. The main purpose of the light characteristic of the light source unit 10 is to collect light by the lens function unit 5 and realize a gentle light distribution with a beam angle of about 40 to 60 degrees when the lens array 4 is mounted. . Therefore, the lens function unit 5 is not given an extremely large light condensing effect and the light source unit 10 is also considered to be thin, so that the lens function unit 5 is made thin and the light distribution is narrowed. It is.

(Convex part 4b of lens function part 5)
Next, the orientation of the lens array 4 will be described. When the lens function unit 5 is formed in a curved convex shape, the lens array 4 is arranged with the convex surface facing the light emitting surface (translucent light diffusing member 6 side) and the device inside (LED light emitting unit side). There are cases. In the former arrangement, the shadow of the light by the lens convex portion 4b is relatively uneven as compared with the latter arrangement, and the light is unevenly observed from the outside. For this reason, in the first embodiment, the latter lens arrangement is adopted. Moreover, since the device light emitting surface side (translucent light diffusing member 6 side) can be a flat surface, the device light emitting surface (light emitting surface of the light transmissive light diffusing member 6) is observed from the outside. Therefore, it can be said that the unevenness due to the lens is not conspicuous and is excellent in design. In addition, since the surface is flat, dust from the outside of the lighting device 100 is hard to collect, and when the lighting device 100 is cleaned, the surface is flat and thus has an advantage of good cleanability.

  That is, by disposing the lens convex surface on the inner side of the device (the LED substrate 2 side), it is possible to provide an illumination device that has high designability and maintainability and has a light condensing effect. Further, as will be described later, there is an advantage that a flat surface is used and a light control member (color conversion member described in the third embodiment) can be easily attached as necessary. Thus, for example, as shown in FIG. 3, the lens function unit 5 of the lens array 4 has a mountain peak from the facing surface 4a on the side facing the mounting surface 2a of the LED substrate of the lens array 4 which is a plate-like body. It rises toward 4c and faces the light emitting surface 1a of the corresponding LED.

(Light distribution characteristics of LED)
At this time, if an LED (for example, a bullet type) having a light condensing effect is used as the LED to be applied, a further light condensing effect by the lens array 4 is added, resulting in a considerably narrow light distribution device. Furthermore, the amount of radiation in the direction of each LED optical axis becomes extremely high due to the light condensing action, and tends to produce deep glare and uneven brightness (illuminance unevenness). Further, the thickness of the lens mold for producing the light condensing effect is increased (the light source is tall and the light source unit 10 itself is thick. Therefore, like the light source unit 10, In a light source unit aiming at a thin and soft light condensing effect, an LED having a light emitting surface substantially flat and having a diffused light distribution characteristic is desirable.

(Translucent light diffusing member 6)
Next, the function of the translucent light diffusing member 6 will be described. In the configuration in which the present lens array 4 is arranged on the LED substrate 2 as in the first embodiment, a narrow light distribution can be realized as compared with the case where there is no lens. However, in many cases, the obtained beam angle is considerably smaller than the target value, and noise components are generated in the wide-angle direction on the light distribution surface as described later. For this reason, the light source unit 10 has a configuration in which a translucent light diffusing member 6 having further diffusibility is disposed on the light emitting surface side of the lens array 4 as a countermeasure. The translucent light diffusing member 6 is made of, for example, a plastic resin (acrylic, polycarbonate, PET, etc.) whose surface has been subjected to embossing or sandblasting, or a material in which a diffusible filler is mixed in the resin.

The translucent light diffusing member 6 has a role of wide light distribution and suppresses the luminous intensity in the optical axis direction of each LED, thereby suppressing unevenness in luminance of the device light emitting surface (surface of the translucent light diffusing member 6) or reducing glare. To play a role.
The translucent light diffusing member 6 is preferably made of a material having a high total light transmittance and a high haze value (cloudiness value). In fact, the prototype of this equipment used acrylic resin that had been subjected to surface embossing in consideration of transparency, heat resistance, and weather resistance.

FIG. 4 shows a cross-sectional shape of the translucent light diffusing member 6. The translucent light diffusing member 6 of the light source unit 10 has a shape in which the central portion of the translucent light diffusing member 6 swells in a curved shape as shown in FIG. Also good. By separating the distance between the translucent light diffusing member 6 and the lens array 4 at the center of the apparatus, it is possible to suppress each LED light source and shadow (brightness unevenness) as seen from the outside of the apparatus, while improving the design. Glare reduction (dazzling suppression) can also be performed. Actually, the prototype of the light source unit 10 has a curved effect, and the depth h of the central portion of the translucent light diffusing member 6 in FIG.
h ≒ 5mm
It was confirmed that the luminance unevenness was greatly reduced by using the surface-treated acrylic member. Thus, the translucent light diffusing member 6 is in the direction of the normal 2L (shown in FIG. 4) of the mounting surface 2a of the LED substrate 2 and in the normal 2L direction from the LED substrate 2 toward the lens array 4. It is formed in a curved shape that curves convexly toward the surface.

(Removal of lens array 4)
The translucent light diffusing member 6 is provided in the light source unit 10 so that the lens array 4 can be attached and detached. With this configuration, as will be described later, wide light distribution illumination with a high diffusibility and a wide beam angle can be realized when the lens array 4 is not attached. On the other hand, when the lens array 4 is mounted, it is possible to realize narrow light distribution illumination with a beam angle slightly narrowed in the light distribution of about 40 to 60 degrees. Therefore, the illumination can be switched by changing the light distribution angle only by attaching and detaching the lens array 4 according to the illumination application, and the application range of the light source unit 10 is further expanded.

5 and 6 are cross-sectional views of the lighting device 100 using the light source unit 10 of FIG. 1 when the members are combined.
5 and 6 show cases where the lens array 4 is mounted and not mounted, respectively. The lens array 4 is installed at a position of a lens array installation stage (not shown) provided on the reflective fixing member 3. As described with reference to FIG. 1, the lighting device 100 has a highly reflective outer reflective housing 8 that is diffused or mirror-like inside so as to surround the light emitting surface (translucent light diffusing member 6) of the light source unit 10. Have.

  The illuminating device 100 is used as a downlight, for example, by being incorporated in a ceiling opening so that an edge on the light emitting surface side of the outer reflective housing 8 is a ceiling surface position. The light distribution characteristics of the lighting device 100 appear dominantly due to the light distribution by the configuration of the light source unit 10, but the outer reflective housing 8 is configured to efficiently use light emitted on the wide-angle side for illumination, It also has a role of making the light emitting surface inconspicuous directly when the illumination device 100 is viewed from a distance. In Embodiment 1, since the light source unit 10 can be thinned for the above reason, when the lighting device 100 is embedded in the ceiling surface, the region protruding to the ceiling back side is low, and therefore the space in the height direction of the ceiling back is narrow. In addition, it is possible to obtain a device that can be mounted sufficiently. In addition, since the lighting device itself using the light source unit 10 can be made thin, for example, even when used as a device directly attached to the ceiling surface, it can be made thin, so that the design is good, and the width of the effect effect of the lighting space is increased. Can do.

A simulation result for the light source unit 10 will be described with reference to FIGS. Below, in order to confirm the light distribution control effect by the structure of the light source unit 10, the light source unit 10 is modeled and the result of having implemented the illumination analysis simulation is demonstrated.
7 and 8 show the appearance model of the apparatus created by CAD.
FIG. 7A shows a perspective view of the model (without the lens array 4 and the translucent light diffusing member 6).
FIG. 7B shows a front view (without the lens array 4 and the translucent light diffusing member 6).
FIG. 8A shows a model perspective view (with a lens array).
FIG. 8B is a diagram illustrating an arrangement relationship between the LED 1 and the lens function unit 5.

  As shown in FIG. 6A, in this model, twelve LEDs 1 are disposed on the LED substrate 2, and the reflective fixing member 3 is disposed around the LED. The single LED component shown in FIGS. 7 and 8 had the appearance shown in FIG. FIG. 7A shows the appearance of the LED 1. The LED 1 itself does not have a lens function in particular, the LED sealing resin portion is substantially flat, the light emitting surface 1a is substantially flat for emitting emitted light having a diffusive light distribution characteristic, and the LED substrate 2 It is substantially parallel to the LED mounting surface 2a. As shown in FIG. 9B, the LED light distribution characteristic of the LED 1a is that of almost completely diffused light emission (FIG. 9A shows a line 1z indicating the light emitting area on the simulator above the LED. ).

(LED1)
Here, as shown in FIGS. 9 (a) and 9 (b), the LED 1 has NS6W183 made by Nichia Corporation (5 × 5 × 1.35 mm) and has almost the same light distribution characteristics. A diffuse light distribution characteristic was given.

(LED board 2)
The LED substrate 2 was subjected to a diffusive treatment with a reflectivity of approximately 85%, and the reflective fixing member 3 was provided as a diffusible material having a reflectivity of approximately 96% and a gently curved inner side surface. The inner diameter (LED substrate exposed portion diameter) of the reflective fixing member 3 was about 55 mm, and the outer diameter (device surface opening diameter) was about 82 mm. The distance from the surface of the LED substrate 2 to the apex of the lens function unit 5 is about 10 mm.

(Lens array 4)
The lens array 4 is made of an acrylic material, and is arranged so that the convex surface faces the light emitting surface side of each LED 1. The diameter of the lens function part 5 of the lens array 4 is larger than the diameter of the LED light emitting part (about 4.5 mm on the surface of FIG. 9A), and the “LED maximum” shown in FIG. In order to prevent the adjacent lens convex portions 4b from overlapping even when “several high-density mounting” is performed, the diameter is set to 8 mm.
As shown in FIG. 3, the convex portion 4b of each lens function unit 5 has a substantially circular circular cross section in a plane parallel to the opposing surface 4a in the root portion 4d starting to rise from the opposing surface 4a (FIG. 1). (C) shows a portion corresponding to the circular cross section 4e). As shown in FIGS. 2 (a) and 3, each light emitting surface 1a of the plurality of LEDs is formed by overlapping the lens array 4 and the LED substrate 2 from the direction of the normal 2L (shown in FIG. 3) of the mounting surface 2a. When viewed (FIG. 2A), it is included in the circular cross section 4e of the root portion 4d of the corresponding lens function section 5.
The LED shown in FIGS. 7 and 8 has a diffused light distribution property as shown in FIG. 9B (cannonball shape having a lens function may be used, but surface brightness unevenness is likely to occur in this apparatus. ). For this reason, the lens function unit 5 of the lens array 4 has a slightly larger diameter than the LED light-emitting unit diameter, thereby increasing the arrangement density of the lens function units 5 to some extent and sufficiently providing a lens effect on the LED light-emitting light. Can do.

(Translucent light diffusing member 6)
Further, as the translucent light diffusing member 6, the scattering characteristics of the diffusing member light-up LSE100 manufactured by Kimoto Co., Ltd. were given (total light and haze are characteristics of about 90% or more in each of our measurements).

Here, a lens array 4 having a curved convex lens function portion 5 so as to face each LED 1 is disposed within the depth of the reflective fixing member 3, and the diameter of the lens function portion 5 is fixed (8 mm). ) The basic trial calculation was performed using the rear focal length of the lens as a parameter. Here, the thickness of the planar portion of the lens array 4 was 1 mm. As a result, we made basic calculations with consideration of the thinning of the device and the spread of light distribution.
Focal length F '= 10mm
Then, the distance d between the LED surface and the convex surface of the lens was adjusted so as to be a target light distribution region.
As a result, as a condition to achieve the desired light distribution area,
d ≧ F ′
not,
d <F '
It was found that the light distribution characteristics were good under the conditions.
For example, FIG. 12 assumes that d = 3 mm, d <F ′ is adopted, and the configuration is as follows.
Each lens function unit 5 of the lens array 4 has a focal point in the direction of the normal 4L of the facing surface 4a on the LED substrate 2 side. Each LED 1 mounted on the LED substrate 2 has a distance d in the direction of the normal 4L between the peak 4c of the convex portion 4b of the corresponding lens function unit 5 and the surface 4a facing the light emitting surface 1a. The focal length F ′ of the focal point on the LED substrate 2 side is shorter.

10 to 12 are diagrams showing changes in light distribution characteristics depending on the presence / absence of a light control member (lens array 4, translucent diffusion member 6) in the light source unit 10 having such a setting (d = 3 mm). It is. The reflective fixing member 3 is attached. FIG. 10A shows “LED substrate 2 + reflective fixing member 3” (type A). FIG. 10B shows the case of “LED substrate 2 + lens array 4 + reflective fixing member 3” (type B). FIG. 11A shows the case of “LED substrate 2 + lens array 4 + translucent light diffusing member 6 + reflecting fixing member 3” (type C). FIG. 11B shows a case of “LED substrate 2 + translucent light diffusing member 6 + reflective fixing member 3” (type D).
A trial calculation was performed at the stage of the configuration of each optical member, and the light distribution control effect by the four types of apparatus configurations A to D was confirmed.
FIG. 12 shows the four types of confirmation results A to D described above.
The horizontal axis in FIG. 12 indicates the relative luminous intensity in a certain angular direction with the central axis of the light source unit 10 as a reference. The vertical axis is relative luminous intensity.

  As a result, “LED substrate 2 only” (type A) emits light almost in a diffuse manner, and in the case of “LED + lens” (type B) in which the lens array 4 is disposed on the LED array 2 (type B), the light collecting effect It can be seen that the emission component is sharp between ± 20 degrees. At this time, light noise that pops out small in the wide-angle direction near both corners 30 to 60 is generated from the graph. Furthermore, in the configuration of “LED + lens + diffusion plate” (type C) on which a surface diffusion plate is arranged, optical noise is greatly reduced, the luminous intensity in the central direction is suppressed, and the beam angle is about 55 deg. Optical properties were obtained.

  Therefore, in the configuration in which the lens array 4 is once condensed and the light transmissive light diffusing member 6 is provided as in the configuration of the light source unit 10, the light source unit 10 having a light distribution characteristic with little light noise and slightly narrowed, The used illumination device can be obtained. In FIG. 12, the luminous flux ratio in the configuration of “LED + lens” (type B) and the configuration of “LED + lens + diffuser plate” (type C) with respect to the luminous flux in the case of “LED substrate 2 only”, respectively. It was found to be 96% and 81%, which is a good state when a member is mounted in terms of light utilization efficiency.

(Type D)
In addition, the result of the configuration of “LED + diffusion plate” (type C) in which the translucent light diffusing member 6 is arranged on the LED substrate 2 without arranging the lens array 4 is particularly concentrated in the absence of optical noise. The illumination light is highly diffusive and has no light effect. Therefore, in the light source unit 10 having the configuration (type C) composed of the LED substrate 2, the lens array 4, and the translucent light diffusing member 6, the lens array 4 can be attached and detached depending on the application, thereby providing wide light distribution illumination. It can be realized by switching the illumination with a slightly narrow light distribution. That is, the light source unit 10 is configured to be capable of alternately repeating assembly and disassembly. The lens array 4 can be attached and detached according to assembly and disassembly. Therefore, this light source unit 10 can be used for multipurpose use. Further, the luminous flux ratio compared with the case of “LED only” in this configuration is about 86%, and it can be used in a good state in terms of light utilization efficiency.

The light distribution control effect by the shape condition of the lens function unit 5 and the influence of the lens array arrangement position on the light distribution were also estimated.
FIGS. 13 and 14 are diagrams showing light distribution trial calculation when the rear focal length (see FIG. 3) related to the shape of the lens function unit 5 is changed. Here, the focal length of the lens function unit 5 was set at three levels, and the trial calculation was performed without changing the arrangement position of the lens array 4. In the trial calculation, the lens portion diameter is fixed to 8 mm, and the focal length is set to F ′ = 20 mm, 10 mm, and 7 mm so as to be reflected in each lens shape (curvature).
FIG. 13A shows a focal length F ′ = 20 mm (type E).
FIG. 13B shows a focal length F ′ = 10 mm (type F).
FIG. 13C shows a focal length F ′ = 7 mm (type G).

FIG. 14 shows a simulation result when the focal length is changed.
As a result, as shown in FIG. 14, it was difficult to obtain a light collecting effect regardless of whether the focal length was long or small, and it was confirmed that the central portion is irradiated with light at a focal length F ′ = 10 mm (type F). When a surface diffusing plate is attached, the higher the light collection effect at the center, the softer the narrower light distribution can be achieved while removing the optical noise, so the focal length F ′ = 10 mm (type F) is better. I understood.

On the other hand, in order to grasp the effect of the position of the lens array 4 under the condition of such a rear focal length F ′ = 10 mm, the position of the lens array 4 is set at three levels as shown in FIGS. It was. The distance between the lens apex and the LED light emitting surface is d, and d = 0.64 mm, 3 mm, and 5.64 mm.
FIGS. 15A and 15B show the cases of 5.64 mm (type H) and d = 0.64 mm (type I), respectively.
FIG. 16 shows the simulation results. As a result, if the focal length is too short, it is difficult to obtain a narrow light distribution as a device (Type I), while if the distance is too long, the narrow light distribution effect is obtained, but the valley between the wide-angle noise component and the medium worry light component. Even if a diffusion plate is disposed on the difference, the noise component tends to be noticeable (type H).

  Therefore, in order to obtain a thin illumination unit having a beam angle of about 40 to 55 degrees and a thickness of about 10 mm, which is less likely to generate optical noise, or a device including the same, the lens array 4 is used as a condition example from the results of this trial calculation. The lens array 4 is arranged at a position of about d = 3 mm (type J), where the rear focal length of the curved convex lens facing the LED is about F ′ = 10 mm, and the distance between the lens apex and the LED light emitting surface is d. I found it good. Similarly, as a result of analysis under other conditions with the lens diameter of φ8 mm, the focal length is about F ′ = 9 to 15 mm and d≈2 to 4 mm with respect to the distance d between the lens back surface and the LED surface. However, it has been found that the light distribution control effect as described above can be obtained.

  When the prototype evaluation was actually performed based on the above trial calculation results, it showed optical characteristics having almost the same tendency as the trial calculation results, and it was confirmed that the actual apparatus had the target function. In simulations and prototypes, several device sizes, such as the number of LEDs mounted, were tried, and showed almost the same characteristics.

  According to the light source unit 10 of the first embodiment, it is possible to easily cope with a change in the luminous flux of the apparatus by adjusting the number of LEDs, and it is difficult to cause light shading due to the lens convex portion, and it is also easy to design and maintain the dust on the lens surface. An excellent narrow light distribution illumination device can be obtained. Furthermore, it is possible to provide an inexpensive and thin device without requiring a reflector surrounding each LED.

Embodiment 2. FIG.
The second embodiment will be described with reference to FIGS. The second embodiment relates to thinning of LEDs to be mounted. In the configuration of the light source unit 10, the lens array 4 is configured such that the number and position of the lens function units 5 are determined in accordance with the arrangement of the maximum mountable LEDs. Here, the “maximum mountable LED” is the number of LEDs 1 mounted on the LED substrate 2 when the light source unit 10 is designed to be the brightest unit, for example. With such a configuration, it is possible to adjust the number of LEDs 1 assuming the mounting number limit. Therefore, there is a feature that light flux adjustment can be easily performed by changing the number of LED mounting without changing the configuration of the lighting device and surrounding components in accordance with the lighting space using the lighting device using the light source unit 10. At this time, since the lens function unit 5 acts on each LED, even if the number of LEDs is changed, the lens function unit 5 other than the lens function unit 5 corresponding to the thinned LED is still mounted on the LED. It corresponds. Therefore, if it sees in the unit of each LED, even if it thins out some LED, the light distribution characteristic unrelated to the number of mounting can be given.

FIG. 17 is a diagram illustrating a mounted state of the LED. FIG. 17A shows an example in which the maximum number of mounted LEDs 1 is 19 under the conditions that the reflective fixing member 3 has an inner diameter of about 55 mm and an outer diameter of about 82 mm, as in the model used in the above simulation. is there. FIGS. 17B and 17C show cases where the number of LEDs is adjusted. FIGS. 17B and 17C show a state in which 19 LEDs are thinned out by 4, 10, respectively. Considering device light distribution and appearance, it is easy to arrange LEDs only in the center (9 in (c)), or mount them more in the periphery than the center (14 in (b)). realizable.
However, even when the number of LEDs is actually adjusted, it is necessary to supply power to the LEDs without any problem.
FIG. 18 and FIG. 19 show examples for dealing with this.

The LED board 2 includes a power supply unit (not shown). Each LED 1 is mounted in series and parallel on a power supply line 15 (conductive pattern) on the LED substrate 2. However, for example, it is necessary to be able to supply power to all LEDs even in the LED thinning-out mounted state (shown by the broken line frame 51) in FIG.
FIG. 19 shows a countermeasure example on the wiring of the LED board 2 in the broken line frame 51 of FIG. In FIG. 18, the power supply line 15 is formed with an LED mounting portion 52 on which an LED is mounted and a resistance mounting portion 53 on which a chip resistor 17 (resistor) is mounted. By doing in this way, it comprised so that the pad 21 for chip resistance might be provided in parallel with the pad 16 for LED mounting. In the portion where the LED 1 is not mounted, a load equivalent to that of the LED (a current supplied to the LED does not change) is mounted so that the power supply to all the LEDs of the apparatus is not interrupted. By doing in this way, stable electric supply can be performed regardless of the number of LEDs, and a necessary light beam can be obtained with a desired LED arrangement. Therefore, usually, the number as shown in Fig. 17 (a) is set as a standard, and the LED arrangement (light distribution) and the number of mounted components (light flux) can be simplified as shown in Figs. 17 (b) and (c). Can be adjusted.

Embodiment 3 FIG.
The third embodiment will be described with reference to FIGS.
FIG. 20 shows a case where the color conversion member 18 is disposed between the LED substrate 2 and the lens array 4.
FIG. 21 shows a case where the color conversion member 18 is disposed between the lens array 4 and the translucent light diffusing member 6.
FIG. 22 shows a case where the entire area of the color conversion member 18 is the color conversion unit 19 having a color conversion function, as compared with FIG.
FIG. 23 is a diagram illustrating characteristics of color conversion (wavelength conversion) by the color conversion unit 19.
In the third embodiment, a case where a color conversion member (wavelength conversion member) is used for the light source unit 10 will be described.

The light source unit 10 can adjust the light distribution by the lens array 4 as described above, but the correlated color temperature and chromaticity can be changed by mounting the color conversion member 18.
20 to 23 show examples in which the color conversion member 18 is arranged in a different position inside the light source unit 10.
20A to 20C are examples in which the color conversion member 18 is disposed in the vicinity of the LED light emitting surface side. That is, the color conversion member 18 is disposed between the LED substrate 2 and the lens array 4. A region (color conversion unit 19) having a function of color conversion (wavelength conversion) in the color conversion member 18 is configured using a long-life color conversion material such as an inorganic phosphor. For example, as shown in FIG. 23, such a material has a function of mainly absorbing the short wavelength side light of the daytime white LED (5000K) and converting the wavelength to the long wavelength side. It has an effect of color conversion to (4000K).

  This material is constituted by, for example, using a thin polycarbonate sheet, PET, acrylic resin or the like as a main material of the color conversion member 18 and printing, applying, or pasting a translucent material bound with a phosphor as a color conversion portion. . Or it arrange | positions so that the opening part may be opened in the said main material and the part may be filled up (it fits). FIG. 21 shows an example of embedding processing.

  In the configuration of FIG. 20, the color conversion member 18 is disposed only on the LED light emitting surface, and color temperature conversion can be performed efficiently. Usually, light passing through such a color conversion portion becomes highly diffusible light. If the LED itself is diffusely distributed, the color-converted light is similarly diffused. Therefore, if the color conversion member 18 is as thin as possible, an efficient color conversion function can be achieved. As a result, the color conversion light passes through the lens array 4 and the light distribution is adjusted.

  For example, as shown in FIG. 21, the color conversion member 18 configured as described above is in contact with the flat portion of the lens array after light has passed through the lens array 4 or the translucent light diffusion member 6 as shown in FIG. You may install in such a position. In this case, since the color conversion member 18 has a property of diffusing light, the translucent light diffusion member 6 can be removed and used. Further, as shown in FIG. 22, the color conversion member 18 having a color conversion function as a whole has a light condensing effect that slightly narrows the light distribution as in the case where there is no color conversion material. It can be used as a color conversion member 18 that maintains a beam angle stop of a level.

  As described above, the light source unit 10 is disposed between the LED substrate 2 and the lens array 4 and between the lens array 4 and the translucent light diffusing member 6 so as to face the lens array 4. A wavelength conversion member having a wavelength conversion function part that converts the wavelength of incident light and emits it is provided.

  In addition to the color conversion member 18 that performs the color conversion described above on the surface of the light transmissive light diffusing member 6 of the light source unit 10 or the vicinity of the surface, the optical characteristic conversion of a light distribution control member such as a prism sheet or a louver. A member can also be provided, and an illumination effect effect corresponding to various illumination scenes can be provided.

Embodiment 4 FIG.
The fourth embodiment will be described with reference to FIGS. In the fourth embodiment, the LED optical axis (hereinafter referred to as the LED optical axis) and the lens optical axis (hereinafter referred to as the lens optical axis) in the direction of the optical axis of the LED between the corresponding LED and the lens function unit 5 are described. It is the structure which dares and shifts. FIG. 24 shows a case where the lens function unit 5 is shifted in the radial direction.
FIG. 25 shows a case where the lens function unit 5 is shifted in the left-right direction.
FIG. 26 shows a case where the lens array 4 is fixed by rotating the lens array 4 in the circumferential direction of the concentric circle with respect to the LEDs mounted substantially on the concentric circle.
FIG. 27 shows the color temperature with respect to the emission angle direction measured by us of LED (NS6W183 manufactured by Nichia Corporation).

  This configuration is particularly effective when an LED having a product model number (NS6W183 manufactured by Nichia Corporation) having the structure shown in FIG. There are various LED configurations. Then, the LED light emission angle (the LED bare chip arrangement, the phosphor application method (coating, sealing resin mixing, etc. on the bare chip, and the latter includes a method of uniformly diffusing and sinking)) The hue of the emission spectrum, chromaticity, color temperature, etc. may vary greatly depending on the angle at which the LED is viewed.

  In the LED shown in FIG. 27, six blue LED bare chips 30 are intensively mounted on the LED package housing 32, and the phosphor that emits and emits light (the main emission color is yellowish) is slightly settled in the sealing resin. It has a mixed structure. When the color temperature with respect to the emission angle of the daytime white LED of the model number was actually measured, the color temperature in the −80 to +80 degree direction is approximately in the daylight white region with the optical axis at about 0 degree. However, as shown in FIG. 27, in the central axis direction (0 degree direction), it was confirmed to be about 5300 K having a strong bluish color because it is directly above the blue chip. In addition, in the direction of about 70 degrees, the yellow light component excited by the blue LED chip was strong and the value was 4800K. That is, a difference in the color depending on the emission angle was confirmed.

  Therefore, when such an LED is applied to the light source unit 10, when the light is condensed by the lens effect of the lens array 4, depending on the type of LED light color, color rendering, etc., the color tone may vary between the central region and the peripheral region of the illuminated surface. It may be confirmed as uneven color. In particular, when the light source unit 10 is used as an illuminating device such as a downlight, for example, when the illuminating device is installed in the vicinity of a white wall surface, when the illuminating light is projected onto the wall surface, this color unevenness (bluish light) In some cases, such color unevenness may give a sense of incongruity such as not matching the atmosphere of the installation space.

  Therefore, as means for reducing such color unevenness, among the LEDs 1 on the LED substrate 2, at least the LED optical axis 1c of the LED 1 mounted on the outer periphery (outside) and the lens function unit 5 of the lens array 4 facing each other. The center axis of the lens (lens optical axis 5c) is intentionally shifted so that the LED light emitting area does not protrude from the area of the lens function unit 5 when viewed from the upper surface of the apparatus (X direction in FIG. 1). To do. The distance between the shifted axes is a distance that is slightly the size of the LED bare chip or slightly larger than that, but the light immediately above the LED optical axis 1c that emits a strong blue component may be slightly refracted around the axis. it can. Therefore, at least when the light of the illumination device 100 is projected onto the wall surface as described above, it is possible to increase the degree of color mixing in the region that is the edge of the center region of the projection region. For this reason, a change in color temperature (color contrast) can be reduced.

  At this time, for all LEDs, the LED optical axis 1c and the lens optical axis 5c of the lens function unit 5 may be shifted from each other. However, the light emitted from the center side of the substrate is uneven in color due to the lens effect. Even if there is, there is a tendency that the color unevenness itself becomes inconspicuous because it mixes with the light emitted from the outside (outside) (color mixture). That is, in the LED that is mounted inside the region 55 in FIG. Therefore, by shifting at least the LED optical axis 1c of the outer LED of the LED substrate and the lens optical axis 5c of the lens function unit 5 corresponding to the LED, it is possible to reduce the color unevenness of the wall surface that is particularly conspicuous. .

As described above, FIGS. 24 to 26 show configuration examples, and the arrangement position of the lens function unit 5 is indicated by a round dotted line. FIG. 24 shows a configuration example in which the lens optical axis 5c of the lens function unit 5 is radially shifted with respect to the LEDs disposed on the outer side among the lens function units 5 disposed to face each other corresponding to the LED.
FIG. 25 is a configuration example in which the lens optical axis 5c of the lens function unit 5 is shifted left and right in units of columns of the LED array. As described above, the arrangement positions of the lens function units 5 may be regularly shifted. On the other hand, the lens optical axes 5c of the individual lens function units 5 are respectively opposed (corresponding) to the LED optical axes 1c facing each other. Alternatively, the position may be shifted randomly.

  As shown in FIGS. 24B and 25B, the LED substrate 2 has a mounting surface 2a in a circumferential arrangement 1b in which a plurality of LEDs among the plurality of mounted LEDs are arranged in a circumferential shape. To be implemented. In addition, the LED substrate 2 is not mounted on the mounting surface 2a in the outer region of the circumferential arrangement 1b, and is different from the LED having the circumferential arrangement 1b on the mounting surface 2a in the inner region of the circumferential arrangement 1b. At least one LED may be mounted. When each of the plurality of LEDs having at least the circumferential arrangement 1b is viewed from the direction of the normal 2L of the mounting surface 2a so that the lens array 4 and the LED substrate 2 are overlapped, the light emitting surface 1a has a corresponding lens function unit. 5 is located in the vicinity of the circumference of the circular cross-section 4e inside the circular cross-section 4e of the root portion 4d (a plurality of broken-line circles in FIGS. 24 and 25).

  Further, in FIG. 26, the lens array 4 having the lens function unit 5 disposed to face the LED of FIG. 17A is slightly rotated in the rotation direction 54 around the center of the lens array 4 to reflect the fixing member 3. It is the structure fixed to. By rotating the lens array 4 in this way, the optical axis of the outer peripheral (outer) LED and the lens function unit 5 opposed to the LED can be shifted, so that the central portion and its periphery at the time of projection of the target illuminated surface can be obtained. The difference in color misregistration can be reduced. When the effect was confirmed by trial manufacture, the lens condensing effect tends to be slightly weakened at this time, but the light distribution of the target beam angle of about 40 to 60 degrees is maintained while having the effect of reducing the color misregistration. I also found that I can do it. That is, it is as follows when it sees from the LED side mounted. As shown in FIG. 26, in the LED substrate 2, at least a plurality of LEDs among the plurality of LEDs to be mounted are mounted substantially concentrically on the mounting surface 2a. Each LED mounted substantially concentrically on the mounting surface 2a corresponds to the light emitting surface 1a when the lens array and the LED substrate 2 are viewed from the normal direction of the mounting surface 2a (FIG. 26). Inside the circular cross section 4e of the root portion 4d of the lens function unit 5, the lens function unit 5 is located in a biased direction in one circumferential direction of the concentric circles.

  FIG. 28 shows an example in which the lens array fixing part 7 of the lens array 4 includes a first fixing part 7-1 and a second fixing part 7-2. Since the rotation of the lens array 4 in the rotation direction 54 can be changed between the case where the first fixing portion 7-1 is used and the case where the second fixing portion 7-2 is used when being attached to the reflective fixing member 3. Color misregistration adjustment can be performed in two stages.

(Fine unevenness of lens function part 5)
FIG. 29 shows another configuration as another reduction means for the color misregistration. Of the convex surface of the lens function part 5 of the lens array 4, the shape of a partial surface region including the apex (mountain peak) was made into a fine uneven shape. As a result, when the bluish light incident on the lens function unit 5 along the LED optical axis 1c passes through the lens function unit 5, the light is slightly diffused and the lens surface in a region other than the fine uneven shape It has the effect of facilitating color mixing with strong yellowish light that passes through. Note that. The width of the fine unevenness processing region and the height of the unevenness can be determined while confirming the light emission characteristics of the light source unit 10. For this reason, the light source unit 10 having this configuration can achieve light distribution with a beam angle of about 40 to 60 deg, which is the purpose of the light source unit 10, while having the effect of reducing color misregistration.

1 LED, 1a light emitting surface, 1b circumferential arrangement, 1c LED optical axis, 2 LED substrate, 2a mounting surface, 2L normal line, 3 reflective fixing member (base portion), 4 lens array, 4a facing surface, 4b convex portion 4c Summit, 4d Root part, 4e Circular cross section, 4L normal line, 5 Lens function part, 6 Translucent light diffusing member, 7 Lens array fixing part, 8 Outer reflection housing, 10 Light source unit, 15 Power supply line ( Wiring pattern), 16 LED mounting pad, 17 chip resistance, 18 color conversion member, 19 color conversion part, 21 chip resistance pad, 30 LED bare chip, 31 phosphor-containing sealing resin, 32 package housing, 33 LED electrode , 40 fine irregularities, 100 illumination device.

Claims (12)

A base part;
A plurality of LEDs that emit emitted light with a predetermined light distribution characteristic are mounted on one surface serving as a mounting surface, and an LED mounting substrate that is fixed to the base portion;
In addition to corresponding to each LED of the plurality of LEDs, it has an opposing surface on which a lens function unit that emits incident light with a narrow light distribution characteristic that is narrower than the light distribution characteristic of the corresponding LED is formed. A lens array that is fixed to the base portion so as to face the mounting surface of the LED mounting substrate so that each lens function portion faces the corresponding LED;
A translucent light diffusing member that is fixed to the base portion on the opposite side of the LED mounting substrate with respect to the lens array, and transmits and diffuses light emitted from the lens function portions of the lens array ;
Each lens function part of the lens array is
A convex portion that is curved on the side of the lens array facing the mounting surface of the LED mounting substrate is formed ,
Each lens function part of the lens array is
It has a focal point in the normal direction of the facing surface on the LED mounting substrate side,
Each of the LEDs mounted on the LED mounting substrate is
Wherein said lens function part crest of the convex portion of the corresponding distance of the normal direction of the surface facing the LED light-emitting surface, is shorter than the focal length of the focal point of the corresponding lens function part light source unit shall be the. The LED mounting substrate is
2. The plurality of LEDs are mounted as a plurality of LEDs each having a substantially flat LED light emitting surface that emits light having a diffusive light distribution characteristic and substantially parallel to the mounting surface. The light source unit described. The convex part of each lens function part is
The cross section of the surface parallel to the facing surface in the root portion that starts to rise from the facing surface forms a substantially circular circular section,
Each LED light emitting surface of the plurality of LEDs is
Looking superimposed and the LED mounting substrate and the lens array from the normal direction of the mounting surface, claim, characterized in that contained in the interior of the circular cross section of the root portion of the corresponding lens function part 2 The light source unit described. The conductive pattern of the LED mounting substrate is
The light source unit according to any one of claims 1 to 3, wherein the LED mounting portion of each of the LED of the LED is mounted, that the resistor is provided in parallel and possible resistance mounting portion mounting. The lens array is
The light source unit according to any one of claims 1 to 4 , wherein the light source unit can be attached and detached in accordance with assembly and disassembly. The translucent light diffusing member is
2. The LED mounting board according to claim 1, wherein the LED mounting board is formed in a curved direction that is curved in a convex direction toward the normal direction from the LED mounting board toward the lens array. The light source unit according to any one of 1 to 5 . The lens function unit corresponding to the LED disposed at the shortest distance from the end of the LED mounting substrate among the plurality of LEDs,
When the lens array and the LED mounting substrate are overlapped when viewed from the normal direction of the mounting surface, the LED light emitting surface of the LED is inside the circular cross section of the root portion of the corresponding lens function unit. 4. The light source unit according to claim 3 , wherein the light source unit is biased to be located near the circumference of the circular cross section. The LED mounting substrate is
At least a plurality of LEDs among the plurality of LEDs to be mounted are mounted substantially concentrically on the mounting surface,
Each of the LEDs mounted on the mounting surface on the substantially concentric circles,
When the lens array and the LED mounting substrate are overlapped when viewed from the normal direction of the mounting surface, the LED light emitting surface is located inside the circular section of the root portion of the corresponding lens function unit, and the concentric circles. 4. The light source unit according to claim 3 , wherein the light source unit is biased in one circumferential direction. The lens array is
The light source unit according to any one of claims 1 to 8 , wherein fine unevenness for diffusing light is formed in a peak area including the peak of the convex part of the lens function part. The light source unit further includes:
It is disposed between the LED mounting substrate and the lens array or between the lens array and the translucent light diffusing member so as to face the lens array and converts the wavelength of incident light. light source unit according to any one of claims 1 to 9, characterized in that it comprises a wavelength conversion member having a wavelength conversion function to to exit.   Each lens function part of the lens array is
  It has a focal point in the normal direction from the facing surface on the LED mounting substrate side toward the LED mounting substrate,
  The distance in the normal direction of the facing surface between the peak of the convex portion and the LED light emitting surface is
  2 mm to 4 mm,
  The focal length of the focal point is
  The light source unit according to claim 1, wherein the light source unit is in a range of 9 mm to 15 mm. Illumination apparatus including a light source unit according to any of claims 1 to 11.

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