Light source device which controls emission light distribution and luminaire

Abstract

To provide a light source device which can suppress generation of luminance unevenness on an irradiation surface, by controlling the distribution of emission light in a device itself containing a point or a substantial point light source.SOLUTION: A light source device has: a point or a substantial point light source; a light distribution control part for receiving radiation light from the point or the substantial point light source, controlling the light distribution of the radiation light, and emitting the radiation light whose light distribution is controlled from a light distribution emission surface range which is an emission surface range of itself; and a dispersion control part for receiving the radiation light emitted from the light distribution emission surface range in a diffusion incident surface range which is an incident surface range of itself, and dispersing the received radiation light and emitting it. Here, the dispersion incident surface range is included in the light distribution emission surface range, or is covered by the light distribution emission surface range. Also, the dispersion incident surface range is integrated with the light distribution emission surface range, or coincides with the light distribution emission surface range and opposes to it. It is also preferable that the dispersion control part emits the dispersed radiation light from the dispersion emission surface opposing to the dispersion incident surface range.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a technique for performing illumination using a point or nearly point light source. [Background technology]

[0002] When using a point light source such as an LED (Light Emitting Diode) for illumination, uneven brightness caused by the point light source can be reflected on the illuminated surface depending on the condition of the illuminated surface, causing problems such as obstructing visibility. For example, when an LED light source is used to illuminate the working area of a machine tool such as a lathe, multiple bright lines are often reflected on the working surface of the machine tool, causing a major problem.

[0003] As a technology for addressing such problems, for example, Patent Document 1 discloses a technology in which a plurality of point light source devices, including point light sources, are arranged in at least two rows in a manner that satisfies predetermined conditions, and a group of superimposed emitted light beams from these point light source devices are irradiated onto the work area, thereby suppressing the appearance of multiple bright lines on work-related surfaces. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-021934 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventionally, by devising an arrangement of a plurality of point light source devices in this way, the occurrence of brightness unevenness such as a plurality of bright lines originating from point light sources on the irradiation surface has been suppressed.

[0006] In response to this, the inventors of the present application have considered that it may be possible to further suppress the occurrence of the above-mentioned uneven brightness by controlling the distribution of emitted light from the point light source device itself.

[0007] In view of the above, the present invention aims to provide a light source device and a lighting apparatus that can control the distribution of emitted light in the device itself, which includes a point or near-point light source, thereby suppressing the occurrence of uneven brightness on the illuminated surface. [Means for solving the problem]

[0008] According to the present invention, a point or nearly point light source; a light distribution control unit that receives radiated light from a point or approximately point light source, controls the light distribution of the radiated light, and emits the radiated light with the controlled light distribution from a light distribution emission surface range that is the emission surface range of the light distribution control unit; a dispersion control unit that receives the radiated light emitted from the light distribution emission surface range in a dispersion incident surface range that is its own incident surface range, and disperses and emits the received radiated light; and The dispersive input surface area is included in or covered by the luminous intensity distribution output surface area. A light source device is provided.

[0009] In this light source device according to the present invention, it is also preferable that the dispersion incident surface range is integral with the light distribution exit surface range or is aligned with and faces the light distribution exit surface range, and the dispersion control section is a dispersion exit surface including the surfaces of a plurality of microlenses, and that the dispersed emitted light is output from the dispersion exit surface facing the dispersion incident surface range.

[0010] In addition, in one embodiment of the light source device according to the present invention, it is also preferable that a plurality of point or approximately point light sources are provided, and the light distribution control unit receives the light emitted from the plurality of point or approximately point light sources at a plurality of light distribution incident surfaces, respectively.

[0011] Furthermore, as another embodiment of the light source device according to the present invention, it is also preferable that the light distribution control section has a hollow section surrounded by a reflective wall that reflects the emitted light, and the light distribution emission surface range is the opening surface on the dispersion control section side of this hollow section.

[0012] Furthermore, as yet another embodiment of the light source device according to the present invention, it is also preferable that a plurality of pairs of point or near-point light sources and light distribution control units are provided, and the distributed incident surface range is included in the entire light distribution exit surface range of the plurality of light distribution control units, or is covered by the entire light distribution exit surface range of the plurality of light distribution control units.

[0013] Furthermore, it is also preferable that the light distribution control section and the dispersion control section according to the present invention are integrally formed, for example, integrally molded. In still another embodiment of the light source device according to the present invention, it is also preferable that the light distribution control section has a plurality of set cross sections including the optical axis, and that the plurality of set cross sections are designed so that the light distribution angle of the radiated light falls within a predetermined range.

[0014] According to the present invention, there is also provided an illumination device having a plurality of the above-described light source devices, comprising: the dispersion control section outputs the dispersed emitted light from a dispersion output surface that is a surface opposite to the dispersion input surface range, the shape of the dispersion-emitting surfaces of the plurality of light source devices is at least one shape that allows the plurality of dispersion-emitting surfaces to be arranged closely together without any gaps; The plurality of light source devices are arranged such that the plurality of dispersive emission surfaces are closely packed together. A lighting device is provided.

[0015] In the lighting device according to the present invention, it is also preferable that the shape of the dispersion exit surface of the plurality of light source devices is an equilateral triangle, a triangle, a square, a rectangle, a parallelogram, a regular hexagon, a hexagon, or a combination of regular polygons according to Archimedean tessellation.

[0016] Furthermore, as one embodiment of the lighting device according to the present invention, it is also preferable that the plurality of light source devices are arranged in at least two rows, and that the at least two rows include two rows that are offset from each other in terms of the positions of the plurality of point or approximately point light sources in the extension direction of the rows. [Effects of the Invention]

[0017] According to the light source device and lighting apparatus of the present invention, the distribution of emitted light from the device itself, which includes a point or approximately point light source, can be controlled, thereby making it possible to suppress the occurrence of uneven brightness on the illuminated surface. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a schematic diagram illustrating an embodiment of a light source device and a lighting apparatus according to the present invention. [Figure 2] 1 is a schematic diagram illustrating an embodiment of a lighting system according to the present invention; [Figure 3] 10 is a schematic diagram showing another embodiment of the light source device according to the present invention. FIG. [Figure 4] 10 is a schematic diagram showing yet another embodiment of a light source device according to the present invention. FIG. [Figure 5] 10 is a schematic diagram showing yet another embodiment of a light source device according to the present invention. FIG. [Figure 6] 1A to 1C are schematic diagrams showing various embodiments of the arrangement of a dispersive light output surface (light source device) according to the present invention. [Figure 7] 10 is a schematic diagram showing yet another embodiment of a light source device according to the present invention. FIG. [Figure 8] 10 is a schematic diagram showing yet another embodiment of a light source device according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the dimensional ratios within and between components in the drawings are arbitrary unless otherwise specified.

[0020] [Light source devices / lighting equipment]

[0021] Fig. 1 is a schematic diagram showing one embodiment of a light source device and a lighting apparatus according to the present invention. In the drawings shown below, an xyz Cartesian coordinate system is appropriately set to clearly indicate specific directions related to the device and apparatus. Fig. 1(C) is a cross-sectional view taken along the yz plane.

[0022] As shown in Fig. 1(A), an LED (Light Emitting Diode) lighting device 1 as one embodiment of a lighting device according to the present invention includes a plurality of LED lighting devices 10 as one embodiment of a light source device according to the present invention. In this embodiment, these LED lighting devices 10 are arranged in at least two rows, three rows in Fig. 1(A) extending in the longitudinal direction (y-axis direction) of the device, within the LED lighting device 1.

[0023] In this embodiment, the LED lighting device 1 distributes power supplied from the wiring 13 to these LED lighting devices 10 via the control unit 12, and radiates the light emitted from these devices 10 that have received power to the outside through a translucent lighting cover attached to cover these devices 10, illuminating the lighting object, for example, the work area when working using a lathe or the like.

[0024] Generally, when a lighting device using a point light source illuminates a work area where work is performed using a lathe or the like, brightness unevenness such as multiple bright lines originating from the point light source is reflected on the work-related surface, causing a problem of impeding the work. In contrast, the LED lighting device 10 and the LED lighting device 1 can suppress the occurrence of brightness unevenness on the illuminated work-related surface.

[0025] Specifically, as shown in FIGS. 1(B) and 1(C), the LED lighting device 10 of this embodiment is installed on a base 11 with legs 102f. (a) an LED light source 101 which is a point or approximately point light source; (b) a light distribution control unit 102 that receives radiated light emitted from the LED light source 101 at a light distribution incident surface 102s, controls the light distribution of the received radiated light, and emits the radiated light with the controlled light distribution from a light distribution exit surface range 102t that is the range of its own exit surface; (c) a dispersion control unit 103 that receives the radiated light emitted from the light distribution emission surface range 102t in a dispersion incident surface range 103s, which is its own incident surface range, disperses the received radiated light, and emits it from a dispersion emission surface 103t; It has the following characteristics.

[0026] The "approximately point light source" in (a) above refers to a light source that has a light-emitting surface with a certain area, but which may cause luminance unevenness on the irradiated surface due to the point light source. Therefore, hereinafter, unless otherwise specified, the expression "point light source" will also include this "approximately point light source."

[0027] In this embodiment, the above-mentioned (b) light distribution control section 102 and the above-mentioned (c) dispersion control section 103 are formed as a single unit (for example, molded as a single unit), and therefore the light distribution exit surface range 102t and the dispersion entrance surface range 103s are integrated at a boundary determined for the sake of convenience or based on the outer shapes of the two control sections 102 and 103. In other words, the dispersion entrance surface range 103s is included in the light distribution exit surface range 102t (in FIGS. 1(B) and 1(C), the dispersion entrance surface range 103s coincides with and is integrated with the light distribution exit surface range 102t).

[0028] As a result, there is no surface area in the distributed incident surface area 103s that does not receive the radiated light from the light distribution output surface area 102t, and as a result, it is possible to emit dispersed radiated light from the entire distributed output surface 103t opposite the distributed incident surface area 103s. In other words, by controlling the distribution of emitted light from the LED lighting device 10 itself, specifically by distributing the emission positions of the emitted light (irradiated light) from the LED lighting device 10 over the entire distributed output surface 103t, the distribution of irradiated light can be made closer to a flatter distribution than the peaked distribution typical of a point light source. This makes it possible to suppress uneven brightness on the illuminated surface.

[0029] In another embodiment, the light distribution control section 102 (b) and the dispersion control section 103 (c) may be individually formed (e.g., individually molded) optical components bonded to each other using, for example, a predetermined adhesive. In this case, the dispersion incident surface area 103s is covered by the light distribution output surface area 102t (in FIGS. 1B and 1C, the dispersion incident surface area 103s is in close contact with and faces the light distribution output surface area 102t). This allows the dispersed radiated light to be emitted from the entire dispersion output surface 103t facing the dispersion incident surface area 103s. In other words, the emission positions of the emitted light (irradiated light) from the LED lighting device 10 can be distributed over the entire dispersion output surface 103t. This makes the distribution of the irradiated light closer to a flatter distribution than the peaked distribution typical of a point light source, thereby reducing the occurrence of uneven brightness on the illuminated surface.

[0030] Whether the light distribution control section 102 (b) and the dispersion control section 103 (c) are formed integrally or separately, they can both be formed using a translucent plastic material such as acrylic resin or polycarbonate resin, or a translucent ceramic material such as transparent optical glass or fluorescent glass. Forming these control sections integrally reduces the fabrication and assembly costs in the device fabrication process. Furthermore, problems such as attenuation of emitted light at the bonding interface do not occur, ensuring good propagation of emitted light. However, it is also preferable to form the leg section 102f separately from the other components of the light distribution control section 102 and the dispersion control section 103 and then bond them to the other components. In this case, the leg section 102f can be formed using a material whose refractive index is lower than the material of the other components by a predetermined amount, so that the total reflection condition is satisfied at the bonding surface (boundary) with the other components. This prevents the leg section 102f from adversely affecting light distribution control.

[0031] Furthermore, the optical body of this embodiment, which is made up of the luminous intensity distribution control section 102 and the dispersion control section 103, is mounted on the base 11 using four legs 102f as described above, but the manner of mounting is not limited to this. For example, this optical body may be mounted such that the lower part (the end on the -z side) of the luminous intensity distribution control section 102 is adhesively fixed to the base 11. Alternatively, it may be mounted using legs (102f') as will be described later with reference to FIG. 7. Furthermore, the housing of the LED lighting device 1 may be formed from a metal material such as die-cast aluminum or stainless steel, or a plastic material such as polycarbonate.

[0032] <Point light source> 1(B) and 1(C), the LED light source 101 of this embodiment is a point light source that is installed and fixed on a base 11, is electrically connected to a wiring circuit provided inside or on the surface of the base 11, receives power from a control unit 12, and emits radiant light. Here, in this embodiment, a plurality of LED light sources 101 (LED lighting devices 10) are mounted side by side on one base 11.

[0033] Specifically, the LED light source 101 includes a light-emitting diode chip (LED chip) that emits light of a first wavelength and emits a mixed light of at least the light of the first wavelength and light of a second wavelength different from the first wavelength. For example, the LED light source 101 may include an LED chip that emits light of the first wavelength (e.g., blue light) and a resin covering the light-emitting surface of the LED chip, the resin containing a phosphor that absorbs the light of the first wavelength and emits light of a second wavelength (e.g., yellow light) as fluorescence. Here, the optical body consisting of the light distribution control unit 102 and the dispersion control unit 103 described above also serves to further promote color mixing and color uniformity in the light emitted from the LED light source 101. This makes it possible to suppress color unevenness, such as a yellow ring, that may occur on the illuminated surface due to the LED light source 101.

[0034] It should be noted that the LED light source 101 is not limited to the above-described configuration. For example, it may be provided with an LED chip that emits light of two or more different wavelengths. It may also be a substantially point light source that uses a surface-emitting light-emitting chip whose light-emitting portion has a predetermined area. Furthermore, the LED lighting device 10 can use a point light source or a substantially point light source other than an LED instead of the LED light source 101.

[0035] <Light distribution control section> 1B and 1C, the light distribution control unit 102 of this embodiment has a recess whose inner wall covers the entire LED light source 101, and receives the light emitted from the LED light source 101 at a light distribution incident surface 102s, which is the upper surface (the surface on the +z side) of this recess. Here, the light distribution incident surface 102s of this embodiment corresponds to the surface of a convex lens bulging in the -z direction. This makes it possible to control the light distribution angle of the incident radiated light to a value within a predetermined range, further enhanced by reflection on the reflective surfaces within the light distribution control unit 102. For example, it is preferable to control this light distribution angle to a value within a range of 5 degrees (°) to 40° as the full angle at half maximum.

[0036] Of course, the shape of the light distribution incident surface 102s is not limited to a convex lens shape, and various surface shapes are possible as long as the light emitted from the LED light source 101 is condensed after incidence. For example, depending on the set light distribution angle, it may be substantially planar. Furthermore, it is also preferable that the light distribution control unit 102 also receives the light emitted from the LED light source 101 from an inner wall surface other than the light distribution incident surface 102s in the recess, that is, an inner wall surface that surrounds the LED light source 101. In this case, the light emitted from the LED light source 101 can be received without leakage.

[0037] <Distributed control unit> 1(B) and 1(C), the dispersion control section 103 of this embodiment includes a plurality of microlenses (minute lenses), specifically a large number of microlenses 103a arranged adjacent to one another or in a tiled pattern. In this embodiment, the dispersion output surface 103t of the dispersion control section 103 is a surface facing (directly opposite) the dispersion input surface range 103s, and includes the surfaces of these microlenses 103a. Furthermore, in this embodiment, the shape and size of the dispersion output surface 103t in the xy plane are the same as the shape and size of the dispersion input surface range 103s in the xy plane.

[0038] As a result, the emitted light, which is mixed light with a controlled light distribution and enters the dispersion control unit 103 through the dispersion incident surface range 103s, is dispersed by these microlenses 103a and emitted to the outside as color-uniformed emitted light (irradiated light) from the entire dispersion exit surface 103t (including the surfaces of the microlenses 103a). In other words, the emission positions of the emitted light (irradiated light) from the LED lighting device 10 can be distributed over the entire dispersion exit surface 103t. As a result, the illumination light distribution (luminance distribution of illumination light) from the LED lighting device 10 approaches a flatter distribution than the peaked distribution characteristic of a point light source, making it possible to suppress uneven luminance on the illuminated surface.

[0039] The microlenses 103a may be isotropic lenses or anisotropic lenses as disclosed in JP 2013-105942 A (JP Patent No. 5641544 A). By employing an anisotropic lens for the microlenses 103a, it is possible to further promote uniformity of the emitted light (illumination light) and further suppress brightness unevenness such as multiple bright lines and color unevenness such as yellow rings.

[0040] <Layout of light source device inside the device> The LED lighting device 1 of this embodiment shown in FIG. 1(A) has a plurality of LED lighting devices 10 arranged on a base 10, and emits a group of light (illumination light) from these LED lighting devices 10 onto an illumination target, such as a work area when working using a lathe or the like.

[0041] In this embodiment, the shape of the diffusive emission surfaces 103t in the xy plane of the multiple LED lighting devices 10 is a square shape that allows these diffusive emission surfaces 103t to be arranged closely together without any gaps, as shown in FIG. 1(A). Furthermore, the multiple LED lighting devices 10 equipped with such shaped diffusive emission surfaces 103t are arranged so that the diffusive emission surfaces 103t are arranged closely together without any gaps. This results in a flatter distribution of the irradiated light from the LED lighting device 1, i.e., the overall luminance distribution of the emitted light beams (irradiated light) from the multiple LED lighting devices 10, since there are no gaps between the diffusive emission surfaces 103t that are non-emitting areas and no valleys in the distribution due to these gaps. As a result, it is possible to more reliably suppress the occurrence of uneven luminance on the irradiated surface.

[0042] Furthermore, in this embodiment, the LED lighting devices 10 provided in the LED lighting device 1 are arranged in at least two rows, three rows in Fig. 1(A) extending in the longitudinal direction (y-axis direction) of the device. These LED lighting devices 10 are also arranged so that two rows of the at least two rows (three rows in Fig. 1(A)) are included that are offset from each other in terms of the positions of the LED light sources 101 in the row extension direction (y-axis direction). Here, in Fig. 1(A) , any two rows (pairs of rows) of the three rows are offset from each other in terms of the positions of the LED light sources 101 in the row extension direction (y-axis direction).

[0043] Hereinafter, with reference to FIG. 2, it will be explained how the above-described arrangement of the LED lighting device 10 can more reliably prevent uneven brightness on the illuminated surface.

[0044] [Lighting System] 2 is a schematic diagram showing an embodiment of a lighting system according to the present invention, in which an XYZ orthogonal system is set in the system to clearly indicate various directions in the system.

[0045] According to FIG. 2(A), the LED lighting system A of this embodiment S The figure includes an LED lighting device 1 and a lathe 1A, which is a machine tool. Note that the lathe 1A is depicted in the same figure with the parts other than the spindle and its surroundings that are relevant to this embodiment omitted. The lathe 1A is equipped with a spindle unit to which a workpiece 1B can be attached, and this spindle unit has a first spindle outer surface 1A1 and a second spindle outer surface 1A2, which are work-related surfaces that are metal surfaces or the like that can reflect light.

[0046] The first spindle outer surface 1A1 and the second spindle outer surface 1A2 are each a curved surface in which a reference tangent that is farthest from the surface as the surface curves is determined for each point on the surface, and in this embodiment, they are part of a cylindrical surface. Note that the range of the first spindle outer surface 1A1 and the second spindle outer surface 1A2 as work-related surfaces can be the range that is actually illuminated by the LED lighting device 1 with a predetermined illuminance or higher.

[0047] Specifically, in FIG. 2(A), two reference tangents t A1 is drawn, but this reference tangent t A1 In this embodiment, the first outer surface 1A1 of the main shaft has a reference tangent t A1 The main shaft is not bent in the direction of the tangent perpendicular to the axis (X-axis direction), i.e., in the direction of the rotation axis of the main shaft portion, but extends straight along this rotation axis (axis in the X-axis direction). A2 is also drawn, but this reference tangent t A2 In this embodiment, the second outer surface 1A2 of the main shaft also has an infinite number of reference tangents t A2 It is not bent in the direction of the tangent perpendicular to the axis (X-axis direction), i.e., in the direction of the rotation axis of the main shaft portion, but extends straight along this rotation axis (axis in the X-axis direction).

[0048] Furthermore, in this embodiment, the workpiece 1B attached to the spindle of the lathe 1A also has a workpiece outer surface 1B1, which is a work-related surface that is a metal surface or the like and can reflect light. The workpiece outer surface 1B1 is also a curved surface in which a reference tangent that is most distant from the surface as the surface curves is determined for each point on the surface, and in this embodiment, it is a part of a cylindrical surface. Specifically, FIG. 2(A) shows two reference tangents t B1 is drawn, but this reference tangent t B1 There are an infinite number of points on the surface. Also, the outer surface 1B of the workpiece is also B1 It is not bent in the direction of the tangent perpendicular to the axis (X-axis direction), i.e., in the direction of the rotation axis of the main shaft portion, but extends straight along this rotation axis (axis in the X-axis direction).

[0049] Here, when a work area including the spindle first outer surface 1A1, the spindle second outer surface 1A2, and the workpiece outer surface 1B1 (work-related surfaces) is illuminated using conventional multiple LED light sources (point light sources) and a normal lens system, multiple bright lines appear on these work-related surfaces as bright line irregularities extending in the X-axis direction. These bright lines are light images originating from multiple point light sources, but are reflected on these work-related surfaces, resulting in a significant obstruction to work.

[0050] For example, when lathe 1A is machining workpiece 1B, severe vibrations known as chatter may occur. When chatter is likely to occur, the operator will adjust machining conditions such as the spindle speed and cutting depth to suppress its occurrence, but at this time, it is extremely important for the operator to quickly detect the occurrence of chatter by visually checking the vibrations of first spindle outer surface 1A1, second spindle outer surface 1A2, and workpiece outer surface 1B1, as well as any chatter marks that may appear.

[0051] However, when multiple bright lines originating from a point light source are reflected on the first spindle outer surface 1A1, the second spindle outer surface 1A2, and the workpiece outer surface 1B1, it becomes extremely difficult to determine whether chatter is occurring. In addition, in the first place, when multiple bright lines reminiscent of a fine structure are visible on these work-related surfaces, visually inspecting fine machining becomes extremely difficult and challenging.

[0052] In order to prevent the occurrence of multiple bright lines, which are a major obstacle, each LED lighting device 10 installed in the LED lighting apparatus 1 of this embodiment has an optical system (light distribution control section 102 and dispersion control section 103) with a special configuration, as described above, which makes the luminance distribution of the irradiated light it emits closer to a flatter distribution than the peaked distribution typical of a point light source. This makes it possible to suppress the occurrence of multiple bright lines that correspond to sharp peaks in the luminance distribution.

[0053] Furthermore, as described above, the multiple LED lighting devices 10 of this embodiment are arranged so that the dispersion-emitting surfaces 103t are closely spaced from one another. As a result, the brightness distribution in the Y-axis direction of the emitted light (illumination light) from these LED lighting devices 10 is closer to a flatter distribution because there are no gaps between the dispersion-emitting surfaces 103t, and no valleys in the distribution due to the gaps are generated. As a result, the appearance of multiple bright lines can be further suppressed.

[0054] Furthermore, in order to more reliably suppress the appearance of multiple bright lines, the LED lighting device 1 of this embodiment includes a plurality of LED lighting devices 10 arranged in three rows extending in the longitudinal direction of the device (y-axis direction) as shown in FIG. 1(A). Here, for any one of the three rows of LED lighting devices 10, the position of the LED light source 101 in the extending direction (y-axis direction) of the row is offset from that of the other two rows. Furthermore, the LED lighting device 1 of this embodiment is installed so that the extending direction (y-axis direction) of the three rows of the plurality of LED lighting devices 10, i.e., the longitudinal direction of the row, is the y-axis direction in FIG. 2(A). As a result, the extending directions (y-axis direction and y-axis direction) of these three rows are aligned with each other in the following manner: (a) "one reference tangent" t on the main axis first outer surface 1A1 (at the top of the outer surface in FIG. 2(A)). A1 (b) "One reference tangent" t on the second outer surface 1A2 of the main shaft (at the top of the outer surface in FIG. 2(A)). A2 and (c) "one reference tangent" t on the outer surface 1B1 of the workpiece (at the top of the outer surface in FIG. 2(A)). B1 is parallel to the direction of

[0055] In this embodiment, the LED lighting apparatus 1 installed as described above irradiates a group of emitted light (irradiated light) from the plurality of LED lighting devices 10 onto a work area including the first outer surface 1A1 of the main shaft, the second outer surface 1A2 of the main shaft, and the outer surface 1B1 of the workpiece (work-related surface) as shown in Figures 2(A) to 2(C). As described above, the positions of the LED light sources 101 in one of the three rows of the plurality of LED lighting devices 10 are shifted in the Y-axis direction, i.e., in the direction of the "single reference tangent" described above, relative to the positions of the LED light sources 101 in the other rows.

[0056] As a result, the brightness distribution in the Y-axis direction of the light beams (illumination light) emitted from the multiple LED lighting devices 10 approaches a flatter distribution because the light beams from each row overlap with their peaks shifted in the Y-axis direction. As a result, the occurrence of multiple bright lines (extending in the X-axis direction) that would appear in a line in the Y-axis direction (i.e., along a single reference tangent line) in conventional lighting using multiple point light sources can be further suppressed and reduced to, for example, a single wide bright band. This also makes it easier to address issues such as chatter that can hinder efficient work. Furthermore, even when performing visual inspections such as fine machining, the brightness unevenness that can hinder visual inspection can be eliminated, enabling more efficient work.

[0057] The LED lighting devices 10 may be arranged in three rows as shown in Fig. 1(A) or in four or more rows in the LED lighting apparatus 1. (A) At least three rows, and the extension direction (y-axis direction) of these rows is parallel to the direction of "one reference tangent" in the work-related surface (the Y-axis direction in Figures 2(A) to 2(C)), or is at a predetermined upper acute angle θ with the direction of "one reference tangent" th1 (Figure 2(A)) and arranged in at least three rows aligned at angles within (i) It is sufficient that the arrangement includes at least three rows, one of which is shifted relative to either of the other two rows in terms of the position of the LED light sources 101 in the direction of extension of the row (y-axis direction).

[0058] Regarding the above condition (a), specifically, the plurality of LED lighting devices 10 shown in FIG. 1(A) are: (a) The deviation of the positions of the LED light sources 101 between the bottom row and the second row in the row extension direction (y-axis direction) is d1, (b) The deviation of the positions of the LED light sources 101 between the second row and the top row in the row extension direction (y-axis direction) is d2, (c) The deviation of the positions of the LED light sources 101 between the top row and the bottom row in the row extension direction (y-axis direction) is d3, (d) If the interval between the positions of the LED light sources 101 in one row in the row extension direction (y-axis direction) is D1, The following formula (1) d1=d2=d3=D1 / 3 They are arranged in three columns so that

[0059] Of course, the above formula (1) does not necessarily have to be established to satisfy the above condition (a). That is, d1, d2, d3, and D1 can be adjusted in various ways depending on the curvature and unevenness of the work-related surface on which multiple bright lines appear. For example, the following formula (2) d1+d2+d3=D1,d1>0,d2>0,d3>0 It should be noted that the value of D1 (the spacing between the LED light sources 101) has a lower limit determined by the size of the LED lighting device 10, but it can also be set to a small value such as 11 millimeters (mm).

[0060] Furthermore, the plurality of LED lighting devices 10 may be arranged in two rows. For example, the plurality of LED lighting devices 10 may be arranged in two rows. (c) At least two rows, the extension direction of these rows (y-axis direction) is parallel to the direction of "one reference tangent" on the work-related surface, or forms a predetermined upper acute angle θ with the direction of "one reference tangent" th1 (Fig. 2(A)) and arranged in at least two rows aligned at an angle within (e) It is sufficient that the arrangement includes at least two rows, one of which is shifted relative to the other row in terms of the position of the LED light sources 101 in the row extension direction (y-axis direction). Incidentally, experiments have confirmed that even in the case of two rows, the appearance of multiple bright lines is suppressed.

[0061] Here, the predetermined upper acute angle θ in (a) and (c) above th1 Regarding (Fig. 2(A)), in Fig. 2(A), the LED lighting device 1 shown by the broken line is tilted from the Y-axis direction, and the angle formed by the direction of projection of the longitudinal direction of this tilted device 1 onto the XY plane and the Y-axis direction is the upper acute angle θ th1 This predetermined upper acute angle θ th1 Since the upper acute angle θ is a value that depends on the curvature and unevenness of the work-related surface, it may be determined by an experiment at an actual site as a condition under which a predetermined illuminance and illumination range are ensured and multiple bright lines are eliminated, or it may be set as an empirical value. th1 For example, a value of 35° is set.

[0062] When the LED lighting device 1 is installed at an angle in this way, the change in the orientation of the LED lighting device 1, i.e., the LED lighting device row, is limited to a predetermined upper acute angle θ th1 Since the allowable range is within this range, there is a high degree of freedom in the installation orientation of the device 1, making lighting design easier. However, in this embodiment, in order to illuminate the work-related surface widely in the Y-axis direction (FIGS. 2(A) to 2(C)) and enable better work performance, the LED lighting device 1 is installed so that the longitudinal direction of the device (y-axis direction) is parallel to this Y-axis direction.

[0063] In addition, the LED lighting system A of this embodiment S The LED lighting system A is equipped with a horizontal lathe 1A as a machine tool, but is not limited to this, and may be equipped with a vertical lathe, a front lathe, a milling machine, a drill press, a milling cell, or the like as a machine tool. In other words, various machine tools having curved work-related surfaces can be used for the LED lighting system A. S The LED lighting device 1 can suppress brightness unevenness such as multiple bright lines, making it possible to easily deal with such phenomena as chatter in machine tools, and even when performing work such as micromachining using such machine tools by visual inspection, brightness unevenness that interferes with visual inspection can be eliminated, allowing for better work.

[0064] [Other embodiments of the light source device] FIG. 3 is a schematic diagram showing another embodiment of the light source device according to the present invention, and is a cross-sectional view taken along the yz plane.

[0065] As shown in FIG. 3, the LED lighting device 20 of this embodiment has an LED light source 201, which is a point light source, installed on a base 21, a light distribution control unit 202 also installed on the base 21, and a dispersion control unit 203 equipped with a microlens 203a, and emits light emitted from the LED light source 201 from a dispersion exit surface 203t as dispersed light with controlled light distribution.

[0066] Of these, the light distribution control unit 202 in this embodiment is: (a) a main body formed of an optical material and having a reflective wall that reflects light emitted from an LED light source 201; (b) A hollow portion 202a surrounded by this reflecting wall and including the LED light source 201 in its lower portion (on the -z side) Furthermore, light distribution output surface range 202t of light distribution control section 202 is the opening surface on the dispersion control section 203 side in cavity 202a, and is integral with and coincides with dispersion input surface range 203s which is the lower end (on the -z side) of dispersion control section 203 in this embodiment.

[0067] Here, a portion of the light emitted from the LED light source 201 is reflected by the reflecting wall and directed upward (in the +z direction), so that the emitted light, with its light distribution controlled to a certain extent, passes through the light distribution exit surface area 202t and enters the dispersed incident surface area 203s. Furthermore, the dispersed incident surface area 203s in this embodiment forms a surface equivalent to the surface of a convex lens that bulges in the -z direction. As a result, the emitted light that enters the dispersed incident surface area 203s is subjected to a focusing effect, further controlling its light distribution.

[0068] The LED lighting device 20 described above, and even the LED lighting apparatus 1 (FIG. 1(A)) employing multiple LED lighting devices 20 instead of the LED lighting device 10, can flatten the luminance distribution of the emitted light(s), thereby suppressing the occurrence of luminance irregularities such as bright lines and color irregularities such as yellow rings on the illuminated surface. Alternatively, multiple LED light sources 201 may be installed in the lower portion (on the -z side) of the hollow portion 202a. By distributing the positions of these multiple LED light sources, it is possible to flatten the luminance distribution of the emitted light(s).

[0069] [Still another embodiment of the light source device] 4A and 4B are schematic diagrams showing still another embodiment of a light source device according to the present invention. Fig. 4A is a cross-sectional view taken along a plane that is tilted 45° with respect to both the x-axis and the y-axis and that includes the z-axis, and shows LED light source 301-1 and LED light source 301-3.

[0070] The LED lighting device 30 of this embodiment has a structure and functions similar to those of the LED lighting device 10 (FIG. 1) described above. However, as shown in FIGS. 4(A) and 4(B), it differs from the LED lighting device 10 in that: (a) A plurality of (four in FIG. 4B) LED light sources 301-1 to 301-4, which are point light sources; (b) A light distribution control section 302 that houses each of these LED light sources and has a plurality of recesses (four in FIG. 4(B)) whose upper portions are light distribution entrance surfaces 302s; That is, the light distribution control section 302 of this embodiment receives the light emitted from the plurality of (four) point light sources at the plurality of light distribution incident surfaces 302s, respectively.

[0071] Here, the light emitted from each LED light source (301-1, . . . , 301-4) is emitted from the dispersion output surface 303t of the dispersion control unit 303 as output light that has been controlled, dispersed, and has a luminance distribution that is closer to a flat distribution. At this time, these output lights (output light group) emitted from this dispersion output surface 303t are mixed and overlapped with each other, and are emitted in a mixed and overlapping state, combined with the fact that they have been mixed and overlapped since before they were emitted. As a result, the luminance distribution of the light irradiated (output light group) from the LED lighting device 30 becomes an overlap of the luminance distributions of these output lights (output light group) whose peak positions are shifted from one another, and therefore approaches a flatter distribution overall.

[0072] This makes it possible to further suppress the occurrence of brightness unevenness such as bright lines on the illuminated surface and color unevenness such as yellow rings. Also, for example, by distributing more LED light sources widely, it is possible to make the brightness distribution of the emitted light (emitted light group) even flatter, or to make the LED lighting device 30 an illumination light source like a surface light source (with a flat brightness distribution) by, for example, increasing the area of the dispersed emission surface 403t.

[0073] The number of LED light sources provided in the LED lighting device 30 is not limited to four, and may be two, three, five or more. For example, a fifth LED light source 301-5 may be provided in the middle of the four LED light sources 301-1 to 301-4 shown in Fig. 4(B). This makes it possible to further flatten the luminance distribution of the irradiated light.

[0074] [Still another embodiment of the light source device] 5A and 5B are schematic diagrams showing still another embodiment of the light source device according to the present invention, where Fig. 5A is a cross-sectional view taken along the yz plane.

[0075] In the LED lighting device 40 of this embodiment, as shown in FIGS. 5(A) and 5(B), (a) A plurality of pairs of LED light sources (401-1, 401-2, . . . , 401-9) which are point light sources and light distribution control units (402-1, 402-2, . . . , 402-9) are provided, nine pairs in FIG. 5(B), (b) A single dispersion control unit 403 equipped with a microlens 303a is provided above (on the +z side of) the plurality of sets of (a), (c) Dispersion incident surface range 403s of dispersion control section 403 is included in or entirely covered by the light distribution output surface ranges (402t-1, 402t-2, . . . , 402t-9) of the multiple (nine) light distribution control sections (in FIG. 5A , dispersion incident surface range 403s and this entire range are integral or coincident and face each other). In other words, these light distribution output surface ranges (402t-1, 402t-2, . . . , 402t-9) are arranged in a packed manner with no gaps between them, and there is no part of dispersion incident surface range 403s that does not receive radiated light from these light distribution output surface ranges.

[0076] In this embodiment, the light distribution control units (402-1, 402-2, . . . , 402-9) and the dispersion control unit 403 have the same structure and function as the light distribution control unit 102 and the dispersion control unit 103 shown in FIGS. 1(B) and 1(C), respectively. The light distribution control units (402-1, . . . , 402-9) and the dispersion control unit 403 may be formed separately and then bonded together to form a single optical body. Alternatively, they may be integrally formed as a single optical body, for example, as an integrally molded product. This reduces the formation and assembly costs in the device fabrication process. Furthermore, problems such as attenuation of emitted light at the bonding interface do not occur in the first place, ensuring good propagation of emitted light.

[0077] Here, the light emitted from each LED light source (401-1, . . . , 401-9) is emitted from the dispersion output surface 403t of the dispersion control unit 403 as output light that has been controlled and dispersed and whose luminance distribution has been made closer to a flat distribution. At this time, the output positions of these output lights (output light group) are distributed more or less evenly across the entire dispersion output surface 403t due to the configuration (c) above. As a result, the luminance distribution of the light irradiated from the LED lighting device 40 (output light group) is closer to a flatter distribution overall, because the output light having a flattened luminance distribution is emitted more or less evenly across the entire dispersion output surface 403t.

[0078] This makes it possible to more reliably suppress the occurrence of brightness unevenness, such as multiple bright lines, and color unevenness, such as yellow rings, on the illuminated surface. Furthermore, in this embodiment, since a light distribution control unit (402-1, 402-2, . . . , 402-9) is provided for each LED light source, the degree of freedom in designing the installation positions of the multiple LED light sources is significantly increased. As a result, it is possible to, for example, arrange more LED light sources in a more widely distributed manner to further flatten the brightness distribution of the emitted light (emitted light group), or to increase the area of the dispersed emission surface 403t, thereby making the LED lighting device 40 a substantially surface light source device (with a flat brightness distribution).

[0079] It should be noted that the number of pairs of LED light sources and light distribution control sections provided in the LED lighting device 40 is not limited to nine, and may be two to eight, or ten or more. As a modification, at least one of the light distribution control sections (402-1, 402-2, ..., 402-9) may have a structure including a hollow section, similar to the light distribution control section 202 shown in Fig. 3. As a further modification, at least one of the light distribution control sections (402-1, 402-2, ..., 402-9) may have multiple LED light sources, similar to the light distribution control section 302 shown in Fig. 4.

[0080] [Various embodiments of the (dispersive) exit surface of the light source device] 6A to 6D are schematic diagrams showing various embodiments of the arrangement of the dispersive light-emitting surface (light source device) according to the present invention. The LED lighting devices (50, 60, 70, 80, 80') shown in FIGS. 6A to 6D may be one of the LED lighting device 10 (FIG. 1), the LED lighting device 20 (FIG. 3), the LED lighting device 30 (FIG. 4), and the LED lighting device 40 (FIG. 5). They may also be the LED lighting device 10' (FIG. 7) or the LED lighting device 90 (FIG. 8), which will be described later. Furthermore, the LED lighting devices (50, 60, 70, 80, 80') provided in the LED lighting apparatus 1 (FIG. 1A) may be a mixture of these LED lighting devices (10, 20, 30, 40, 10', 90).

[0081] First, referring to Fig. 6(A), in the LED lighting device 1 (Fig. 1(A)), a plurality of LED lighting devices 50, each having a square-shaped diffusive-exit surface 503t, are arranged so that the diffusive-exit surfaces 503t are closely spaced. Here, the plurality of rows of the LED lighting devices 50 extending in the y-axis direction are arranged so that the device positions in the y-axis direction are offset from one another, similar to the three rows shown in Fig. 1(A). However, as a modification, the plurality of rows may be arranged so that the device positions in the y-axis direction are aligned (without offset).

[0082] 6(B), in the LED lighting device 1 (FIG. 1(A)), a plurality of LED lighting devices 60, each having an equilateral triangular diffusive-exit surface 603t, are arranged so that the diffusive-exit surfaces 603t are closely spaced. Similarly to FIG. 6(A), the rows of the LED lighting devices 60 extending in the y-axis direction are also arranged so that the device positions in the y-axis direction are offset from one another. However, as a modification, the rows of the LED lighting devices 60 may also be arranged so that the device positions in the y-axis direction are aligned (without offset).

[0083] Furthermore, as shown in Fig. 6(C), within the LED lighting device 1 (Fig. 1(A)), a plurality of LED lighting devices 70 each having a regular hexagonal dispersion-exit surface 703t are arranged in a closely packed arrangement with no gaps between them. Furthermore, as shown in Fig. 6(D), within the LED lighting device 1 (Fig. 1(A)), a plurality of LED lighting devices 80 each having a regular octagonal dispersion-exit surface 803t and a plurality of LED lighting devices 80' each having a square dispersion-exit surface 803t' are arranged in a closely packed arrangement with no gaps between them. Incidentally, the arrangement of the dispersion-exit surfaces 803t and 803t' shown in Fig. 6(D) is one of the eight combinations of regular polygons according to Archimedean tessellation.

[0084] As described above, in the LED lighting device 1 (FIG. 1(A)) equipped with multiple LED lighting devices (50, 60, 70, 80, 80'), multiple dispersion-emitting surfaces (503t, 603t, 703t, 803t, 803t') are arranged in a tightly packed pattern. This allows the luminance distribution of the irradiated light from the LED lighting device 1, i.e., the luminance distribution of the entire group of emitted light (irradiated light) from the multiple LED lighting devices (50, 60, 70, 80, 80'), to be even flatter because the luminance distribution of each individual emitted light is already made closer to a flat distribution. Furthermore, there are no gaps between the dispersion-emitting surfaces that do not emit light, which eliminates the valleys in the distribution caused by these gaps. As a result, it is possible to more reliably suppress the occurrence of uneven luminance on the irradiated surface.

[0085] In other words, by devising an arrangement of the plurality of LED lighting devices (50, 60, 70, 80, 80'), it is possible to achieve an effect that further expands the effect achieved by the single LED lighting device 40 shown in FIG.

[0086] The shape of the light-dispersing surface (503t, 603t, 703t, 803t, 803t') of the LED lighting device is not limited to the above, as long as it is at least one shape that can be laid out without gaps. For example, the shape of the light-dispersing surface (503t, 603t, 703t, 803t, 803t') can be one of an equilateral triangle, a triangle, a square, a rectangle, a parallelogram, a regular hexagon, a hexagon, or a combination of regular polygons according to Archimedean tessellation (8 types).

[0087] [Still another embodiment of the light source device] Fig. 7 is a schematic diagram showing still another embodiment of the light source device according to the present invention, which is a cross-sectional view taken along the yz plane.

[0088] The LED lighting device 10' of this embodiment shown in Figure 7 is a device that employs a light distribution control section 102' equipped with a leg section 102f' instead of the light distribution control section 102 (Figure 1) in the LED lighting device 10 (Figure 1) already described.

[0089] Here, leg portion 102f' is a portion of light distribution control portion 102' that is below (on the -z side of) the "light-emitting surface-containing surface" that includes the light-emitting surface of LED light source 101, and is, for example, a hollow cylindrical portion whose lower end surface is adhered and fixed to base 11. Furthermore, in this embodiment, LED light source 101 has an upper surface (on the +z side) that is the light-emitting surface, and the "light-emitting surface-containing surface" that includes this light-emitting surface is a plane parallel to the xy plane. As a result, light emitted from LED light source 101 does not reach leg portion 102f', which is located below (on the -z side of) the "light-emitting surface-containing surface." Therefore, leg portion 102f' can properly support and fix an optical body including light distribution control portion 102' and dispersion control portion 103 without adversely affecting the light distribution control in light distribution control portion 102'.

[0090] [Still another embodiment of the light source device] 8A and 8B are schematic diagrams showing still another embodiment of a light source device according to the present invention, in which Fig. 8B is a cross-sectional view taken along a plane including an axis generally in the same direction as the y-axis and the z-axis.

[0091] In the LED lighting device 90 of this embodiment shown in FIG. 8(A), the light distribution control section 902 has a plurality of set cross sections ("set cross sections") that include an optical axis (an axis that passes through the center of the light-emitting surface of the LED light source 901 and is parallel to the z-axis), and each of these set cross sections is designed so that the light distribution angle of the radiated light falls within a predetermined range.

[0092] Specifically, in this embodiment, the light distribution control unit 902 has 12 "light distribution control parts," each including one of the 12 "set cross sections," and each "light distribution control part" is designed so that the light distribution angle of the radiated light is a value within a predetermined range (in this embodiment, approximately 0°, i.e., a value within 0°±Δθ°), in other words, so that the radiated light after light distribution control is light approximately in the direction of the optical axis (z-axis).

[0093] For example, the gray "light distribution control portion" in Fig. 8(A) is designed so that the radiated light emitted from the LED light source 901 and reflected by the reflecting surface becomes light generally in the direction of the optical axis (z-axis) in its "set cross section" as shown in Fig. 8(B). As a result, the radiated light enters the dispersion control portion 903 (dispersion incident surface range 903s) generally perpendicularly, and ultimately, dispersed light with a well-controlled light distribution can be emitted to the outside as illumination light.

[0094] Here, a necessary condition for making the emitted light light approximately in the direction of the optical axis (z-axis) is to design the reflecting surface so that the normal to the reflecting surface intersects with the optical axis (z-axis), as also shown in Figure 8(B). However, in the above-mentioned LED lighting device 10 (Figure 1), for example, the reflecting surface of light distribution control section 102 is a continuous curved surface, while the shape of distributed incident surface range 103s (light distribution exit surface range 102t) is a regular polygon (a square in Figure 1), so that it is virtually impossible to design the device so that the above necessary condition is satisfied in all cross sections including the z-axis.

[0095] In contrast, in the LED lighting device 90 of this embodiment, a plurality of (12 in FIG. 9(A)) "light distribution control portions" are provided that each include a set of a plurality of (12 in FIG. 9(A)) "set cross sections," and each "light distribution control portion" can be individually designed to satisfy the above-mentioned requirements. In other words, with the LED lighting device 90 of this embodiment, by setting a plurality of "light distribution control portions" and performing partial optimization of light distribution control, it becomes possible to implement more suitable light distribution control that is tailored to the shape of the distributed incident surface range 103s (light distribution exit surface range 102t).

[0096] In this embodiment, when LED lighting device 90 is viewed from above (the +z side) as shown in Fig. 8(A), there is actually no minute portion of light distribution control section 902 that would extend beyond (the dispersion incident surface range 903s of) dispersion control section 903. For example, light distribution control section 902 can be molded so that such a minute portion, which is taken into account in optical design, is not actually formed.

[0097] As described above in detail, in the light source device according to the present invention, there is no surface area in the divergent incident surface area that does not receive radiated light from the light distribution radiated surface area, and as a result, it is possible to emit radiated light from the entire divergent radiated surface. In this way, by controlling the distribution of the radiated light in the light source device itself, specifically by distributing the emission positions of the radiated light (illumination light) over the entire divergent radiated surface, it is possible to make the distribution of the radiated light closer to a flatter distribution than the peaked distribution characteristic of a point light source. This also makes it possible to suppress the occurrence of uneven brightness on the radiated surface.

[0098] Furthermore, in one embodiment of the present invention, when illuminating a work area including a machine tool such as a lathe, it is possible to suppress or eliminate bright line unevenness, such as multiple bright lines, that have conventionally appeared on work-related surfaces. This allows workers to easily deal with phenomena such as chatter that hinder good work, and even when performing work such as fine machining by visual inspection, workers are freed from bright line unevenness that hinders visual inspection, enabling them to perform work better.

[0099] The above-described embodiments are merely illustrative of the present invention, and are not intended to limit the scope of the present invention, which can be embodied in various other modified and altered forms. Therefore, the scope of the present invention is defined only by the claims and their equivalents. [Explanation of symbols]

[0100] 1 LED lighting device 10, 10', 20, 30, 40, 50, 60, 70, 80, 80', 90 LED lighting device (light source device) 101, 201, 301-1, 301-2, 301-3, 301-4, 401-1, 401-2, 401-3, 401-4, 401-5, 401-6, 401-7, 401-8, 401-9, 901 LED light source (point light source) 102, 102', 202, 302, 402-4, 402-5, 402-6, 902 Light distribution control section 102f,102f' Legs 102s, 102s', 302s Light distribution incident surface 102t, 102t', 202t, 302t, 402t-4, 402t-5, 402t-6, 902t Light distribution output surface range 103, 203, 303, 403, 903 Distributed control unit 103a, 203a, 303a, 403a Microlenses 103s, 203s, 303s, 403s, 903s Dispersion incident surface range 103t, 203t, 303t, 403t, 503t, 603t, 703t, 803t, 903t Dispersion exit surface 11, 21, 31, 41 Foundations 12 Control Unit 13 Wiring 1A Lathe (machine tool) 1A1 Spindle No. 1 outer surface (work-related surface) 1A2 Spindle No. 2 outer surface (work-related surface) 1B Processed material 1B1 Outer surface of processed material (work-related surface) 202a Cavity As LED lighting system

Claims

1. a point or nearly point light source; a light distribution control unit that receives radiated light from the point or approximately point light source, controls the light distribution of the radiated light, and emits the radiated light with the controlled light distribution from a light distribution emission surface range that is the emission surface range of the light distribution control unit; a dispersion control unit that receives the radiated light emitted from the light distribution emission surface range in a dispersion incident surface range that is its own incident surface range, and disperses and emits the received radiated light; and The distributed incident surface area is included in the light distribution exit surface area or is covered by the light distribution exit surface area. A light source device characterized by:

2. the dispersion input surface area is integral with the light distribution output surface area or is coincident with and opposite the light distribution output surface area; The dispersion control section is a dispersion output surface including the surfaces of a plurality of microlenses, and outputs the dispersed emitted light from the dispersion output surface facing the dispersion input surface range.

2. The light source device according to claim 1.

3. a plurality of point or approximately point light sources are provided; The light distribution control unit receives the light emitted from the plurality of point or approximately point light sources at a plurality of light distribution incident surfaces.

2. The light source device according to claim 1.

4. the light distribution control section has a cavity surrounded by a reflective wall that reflects the emitted light, The light distribution exit surface range is an opening surface on the dispersion control unit side of the cavity.

2. The light source device according to claim 1.

5. a plurality of pairs of the point or approximately point light source and the light distribution control unit are provided; The dispersion incident surface range is included in the entire light distribution exit surface range of the plurality of light distribution control sections, or is covered by the entire light distribution exit surface range of the plurality of light distribution control sections.

2. The light source device according to claim 1.

6. 2. The light source device according to claim 1, wherein the light distribution control section comprises a plurality of set cross sections including an optical axis, each of which is designed so that the light distribution angle of the emitted light falls within a predetermined range.

7. 2. The light source device according to claim 1, wherein the light distribution control section and the dispersion control section are integrally formed.

8. A lighting device comprising a plurality of light source devices according to any one of claims 1 to 7, the dispersion control unit outputs the dispersed emitted light from a dispersion output surface that is a surface opposite to the dispersion input surface range, the shape of the diverging light exit surfaces of the plurality of light source devices is at least one shape that allows the plurality of diverging light exit surfaces to be laid out closely together without any gaps; The plurality of light source devices are arranged such that the plurality of dispersive emission surfaces are closely packed together. A lighting device characterized by:

9. 9. The lighting device according to claim 8, wherein the shape of the dispersive exit surface of the plurality of light source devices is an equilateral triangle, a triangle, a square, a rectangle, a parallelogram, a regular hexagon, a hexagon, or a combination of regular polygons according to Archimedean tessellation.

10. The lighting device according to claim 8, characterized in that the plurality of light source devices are arranged in at least two rows, and the at least two rows include two rows that are offset from each other in terms of the positions of the plurality of point or approximately point light sources in the extension direction of the rows.

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