Illumination module and cylindrical lens

Abstract

To provide a technology capable of reducing glare in a lighting module comprising a light source and a cylindrical lens.SOLUTION: A cylindrical lens of a lighting module comprises: an incident surface that has an opposite incident surface provided on the opposite side of an irradiation target surface with respect to an optical axis of a light source, and an optical axis incident surface provided closer to the irradiation target surface than the opposite incident surface so as to intersect the optical axis and guiding light incident from the light source to an emission surface; and a reflective surface that reflects light incident from the opposite incident surface to the emission surface. The optical axis incident surface is formed so as to intersect the optical axis with a curved surface that is convex toward the light source and approaches the light source toward the irradiation target surface.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a lighting module and a cylindrical lens used in the lighting module.

Background Art

[0002] Conventionally, a so-called wall washer type lighting device installed on a ceiling, floor, etc. and irradiating light on a wall surface, signboard, etc., or a so-called footlight type lighting device installed on a wall surface, etc. and irradiating light on a floor surface, ground surface, etc. has been widely used. In this regard, a lighting device including a lighting module that changes the light distribution of light emitted from an LED light source by a cylindrical lens and uniformly irradiates light on a wall surface is known (for example, Patent Document 1). Such a lighting device is installed so that the optical axis of the light source is parallel to the irradiation target surface, and the optical surface of the cylindrical lens is set so that the light incident on the lens from a position on the irradiation target surface side from the center of the light source is emitted to the irradiation target surface side with respect to the optical axis.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a conventional lighting module, although the light from the center of the light source is set to irradiate the irradiation target surface, the light incident on the lens from a position on the irradiation target surface side from the center of the light source is not sufficiently considered, so this light may be emitted from the lens to the opposite side of the irradiation target surface, which may cause glare.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a technique capable of reducing glare in a lighting module including a light source and a cylindrical lens.

Means for Solving the Problem

[0006] In order to solve the above problems, the present invention adopts the following configuration. That is, the present invention includes a light source and a cylindrical lens extending in a first direction orthogonal to the optical axis direction of the light source, and is an illumination module for irradiating light onto an irradiation target surface spaced apart from the light source in a second direction orthogonal to the optical axis direction and the first direction, wherein the cylindrical lens has an exit surface, and an opposite-side incident surface provided on the opposite side of the irradiation target surface with respect to the optical axis of the light source, and an optical axis incident surface provided closer to the irradiation target surface side than the opposite-side incident surface so as to intersect the optical axis, and guides the light incident from the light source to the exit surface. The incident surface includes a reflection surface that reflects the light incident from the opposite-side incident surface to the exit surface, wherein the optical axis incident surface is convex on the light source side and is formed as a curved surface that approaches the light source as it goes toward the irradiation target surface and intersects the optical axis, and is an illumination module.

Effects of the Invention

[0007] According to the present invention, in an illumination module including a light source and a cylindrical lens, it is possible to reduce glare.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Figure 23

Figure 24

Figure 25

Figure 26

Figure 27

Figure 28

Figure 29

Figure 30

Figure 31

[0009] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are merely illustrative of the preferred configurations of the present invention, and do not limit the scope of the present invention to those configurations. In addition, the configurations described in the following embodiments are not intended to limit the technical scope of the invention only to those, unless otherwise specified. In principle, the same reference numerals are assigned to the same components, and repeated explanations are omitted. In addition, in the cross-sectional views described below, for the sake of convenience, the hatching of the cross-section is omitted.

[0010] [Embodiment 1] FIG. 1 is an overall perspective view of the lighting module according to Embodiment 1. The arrows in FIG. 1 indicate the directions for defining the relative positional relationship of each component of the lighting module 100. Reference numeral D1 indicates the first direction, D2 indicates the second direction, and D3 indicates the third direction. The first direction D1 and the second direction D2 are orthogonal to each other, and the third direction is orthogonal to the first direction and the second direction. As shown in FIG. 1, the lighting module 100 according to Embodiment 1 includes a light source 10, a lens 20, and a substrate 30.

[0011] [Light Source] The light source 10 is an elongated LED (Light Emitting Diode) light source having a rectangular light emitting surface 10a and supported by a substrate 30. The light source 10 is provided such that its light emitting surface 10a is orthogonal to the third direction D3 and the longitudinal direction of the light emitting surface 10a coincides with the first direction D1. That is, the light source 10 is formed in an elongated shape so as to be long in the first direction D1. Here, the direction orthogonal to the light emitting surface 10a is referred to as the optical axis direction. The optical axis direction in this example coincides with the third direction D3. The light source 10 emits light having a Lambertian distribution with the maximum intensity in the optical axis direction from the light emitting surface 10a. Note that the light source according to the present invention is not limited to an LED and may be composed of other types of light emitting elements. The light source may be composed of, for example, an organic EL (Electro Luminescence).

[0012] [Cylindrical lens] The lens 20 is an optical element that introduces the light emitted from the light source 10, changes its light distribution, and emits it to the outside. The lens 20 is arranged side by side with the light source 10 in the optical axis direction (the third direction D3) and is aligned with the light source 10 at a predetermined position. The material of the lens 20 is not particularly limited, and examples thereof include transparent resin materials such as PMMA (polymethyl methacrylate), PC (polycarbonate), and EP (epoxy resin), and transparent glass materials. As shown in FIG. 1, the lens 20 is formed as a cylindrical lens extending in the first direction D1. In this specification, the "cylindrical lens" refers to a lens having a cylindrical surface. The "cylindrical surface" refers to a surface that has no curvature in one direction and has curvature in a direction orthogonal thereto.

[0013] [Illumination device] FIG. 2 is a diagram showing an example of use of the lighting module 100 according to Embodiment 1. Reference numeral T1 in FIG. 2 indicates a surface to be irradiated by the lighting module 100 (hereinafter referred to as the irradiation target surface). The lighting device indicated by reference numeral 1000 includes the lighting module 100 and a housing H1 that houses the lighting module 100. As shown in FIG. 2, the lighting device 1000 is a device that illuminates the irradiation target surface T1 with the lighting module 100. The irradiation target surface T1 is not particularly limited, and examples include a wall surface, a floor surface, a ground surface, a ceiling surface, a display surface of a signboard, and the like. The lighting device 1000 is installed on an installation target surface T2 perpendicular to the irradiation target surface T1 in a posture where the optical axis direction (third direction D3) of the light source 10 is parallel to the irradiation target surface T1. The lighting module 100 is configured to irradiate the light L10 onto the irradiation target surface T1 spaced apart from the light source 10 in the second direction D2.

[0014] [Lens shape] FIG. 3 is a cross-sectional view of the lighting module 100 according to Embodiment 1. In FIG. 3, a cross-section perpendicular to the first direction D1 is shown. Reference numeral A1 in FIG. 3 indicates the optical axis of the light source 10 (hereinafter referred to as the light source optical axis). The light source optical axis A1 is a straight line passing through the center point CP in the second direction D2 of the light emitting surface 10a of the light source 10 and parallel to the optical axis direction (third direction D3), and is defined for each cross-section perpendicular to the first direction D1. As shown in FIG. 3, the lens 20 is formed asymmetrically in the second direction D2, and includes an incident surface 1, an exit surface 2, a first reflection surface 3, and a second reflection surface 4.

[0015] As shown in FIG. 3, the incident surface 1 is provided on the light source 10 side of the lens 20 and is a surface on which the light emitted from the light source 10 is incident. The incident surface 1 is formed as a cylindrical surface having no curvature in the first direction D1 and having curvatures in the second direction D2 and the third direction D3. The incident surface 1 includes a first incident surface 11, a second incident surface 12, and a third incident surface 13.

[0016] As shown in FIG. 3, the first incident surface 11 is provided on the side opposite to the irradiation target surface T1 with respect to the light source optical axis A1, and refracts a part of the light emitted from the light source 10 and guides it to the first reflection surface 3. It is formed like a sea urchin. The first incident surface 11 corresponds to the "opposite incident surface" according to the present invention. The first incident surface 11 is inclined so as to approach the light source optical axis A1 as it moves away from the light source 10 in the optical axis direction. The second incident surface 12 is provided on the irradiation target surface T1 side with respect to the light source optical axis A1, that is, on the opposite side of the first incident surface 11, and is formed so as to refract a part of the light emitted from the light source 10 and guide it to the second reflection surface 4. The second incident surface 12 is inclined so as to approach the light source optical axis A1 as it moves away from the light source 10 in the optical axis direction. The first incident surface 11 and the second incident surface 12 are formed by a part of a symmetric line with the light source optical axis A1 as the axis of symmetry. Therefore, the inclination angle of the first incident surface 11 with respect to the light source optical axis A1 is equal to the inclination angle of the second incident surface 12 with respect to the light source optical axis A1.

[0017] As shown in FIG. 3, the third incident surface 13 is provided on the irradiation target surface T1 side of the first incident surface 11 so as to intersect the light source optical axis A1. More specifically, the third incident surface 13 is provided between the first incident surface 11 and the second incident surface 12 so as to intersect the light source optical axis A1, and is formed so as to collect a part of the light emitted from the light source 10 by refraction and guide it to the emission surface 2. The third incident surface 13 corresponds to the "optical axis incident surface" according to the present invention. The third incident surface 13 has an aspherical shape that is curved convex toward the light source 10 side. In the description of the surface shape of the lens in this specification, "convex toward the light source side" means that the surface is formed by a convex curve toward the light source side. Also, "convex toward the opposite side of the light source" means that the surface is formed by a convex curve toward the opposite side of the light source. For example, when the incident surface is "convex toward the light source side", the incident surface is a surface where the lens material bulges toward the light source side. Also, when the incident surface is "convex toward the opposite side of the light source", the incident surface is a surface where the lens material is recessed toward the opposite side of the light source.

[0018] As shown in FIG. 3, the third incident surface 13 is formed asymmetrically in the second direction D2. Reference sign P1 in FIG. 3 indicates the vertex of the third incident surface 13. As shown in FIG. 3, the vertex P1 of the third incident surface 13 is located on the side of the irradiation target surface T1 with respect to the light source optical axis A1. Here, let the distance between the light source optical axis A1 and the end portion of the light emitting surface 10a of the light source 10 on the side of the irradiation target surface T1 be a1, and the distance between the light source optical axis A1 and the vertex P1 be b1. At this time, the third incident surface 13 is formed such that b1 is larger than 80% of a1. That is, the vertex P1 is located on the side of the irradiation target surface T1 with respect to the position that is 80% of the distance from the light source optical axis A1 to the end portion of the light source 10 on the side of the irradiation target surface T1.

[0019] Also, as shown in FIG. 3, the end portion of the third incident surface 13 on the side opposite to the irradiation target surface T1 is connected to the first incident surface 11, and the end portion of the third incident surface 13 on the side of the irradiation target surface T1 is connected to the second incident surface 12. Here, let the inclination angle of the connection portion 13a, which is a part of the third incident surface 13 and is a portion connected to the first incident surface 11, with respect to the light source optical axis A1 be θ1. At this time, the third incident surface 13 is formed such that 35° ≤ θ1 ≤ 65°.

[0020] FIG. 4 is an enlarged view of the third incident surface 13. As shown in FIG. 4, in the third incident surface 13, the portion on the side opposite to the irradiation target surface T1 with respect to the vertex P1 is defined as the opposite-side third incident surface 131, and the portion on the side of the irradiation target surface T1 with respect to the vertex P1 is defined as the irradiation-target-surface-side third incident surface 132. As shown in FIG. 4, the opposite-side third incident surface 131 is formed as a curved surface that is convex toward the light source 10 and approaches the light source 10 as it goes toward the irradiation target surface T1. Here, IP1 in FIG. 4 indicates the intersection point of the third incident surface 13 and the light source optical axis A1. As shown in FIG. 4, the intersection point IP1 is formed on the opposite-side third incident surface 131. Since the vertex P1 of the third incident surface 13 is located on the side of the irradiation target surface T1 with respect to the light source optical axis A1, the third incident surface 13 intersects the light source optical axis A1 at the opposite-side third incident surface 131. That is, the illumination module 100 according to Embodiment 1 is configured such that the incident surface of the cylindrical lens is a curved surface that is convex toward the light source side and approaches the light source as it goes toward the irradiation target surface side, and intersects the optical axis of the light source.

[0021] As shown in FIG. 3, the first reflecting surface 3 is provided on the side opposite to the irradiation target surface T1 with respect to the light source optical axis A1, and is formed to internally reflect a part of the light incident from the first incident surface 11 and guide it to the emission surface 2. The first reflecting surface 3 corresponds to the "reflecting surface" according to the present invention. The second reflecting surface 4 is provided on the irradiation target surface T1 side with respect to the light source optical axis A1, that is, on the side opposite to the first reflecting surface 3, and is formed to internally reflect a part of the light incident from the second incident surface 12 and guide it to the emission surface 2. The first reflecting surface 3 and the second reflecting surface 4 are formed as a cylindrical surface having no curvature in the first direction D1 and having curvature in the second direction D2 and the third direction D3. The first reflecting surface 3 is inclined so as to move away from the light source optical axis A1 as it moves away from the light source 10 in the third direction D3. The second reflecting surface 4 is inclined in the same manner as the first reflecting surface 3 so as to move away from the light source optical axis A1 as it moves away from the light source 10 in the third direction D3.

[0022] As shown in FIG. 3, an arbitrary point on the first reflecting surface 3 is defined as the first reflection point P3, and a point on the second reflecting surface 4 in the same cross section that is at the same position as the first reflection point P3 in the optical axis direction is defined as the second reflection point P4. Also, the distance in the second direction D2 between the light source optical axis A1 and the first reflection point P3 is defined as d1, and the distance in the second direction D2 between the light source optical axis A1 and the second reflection point P4 is defined as d2. At this time, the first reflecting surface 3 and the second reflecting surface 4 are formed such that d1 < d2. That is, the inclination angle of the second reflecting surface 4 with respect to the light source optical axis A1 is larger than the inclination angle of the first reflecting surface 3 with respect to the light source optical axis A1.

[0023] Here, the shapes of the first reflecting surface 3 and the second reflecting surface 4 can be represented by the following aspherical formula (1). In the above formula (1), y is the distance from the vertex in the second direction D2, x is the displacement amount in the optical axis direction from the vertex at the position of y, R is the vertex curvature radius of the original spherical surface, K is the conic constant, and A to E are aspherical coefficients. At this time, the first reflecting surface 3 of this example is set so that K ≤ -0.5. Also, the second reflecting surface 4 of this example is set so that K ≤ -1.

[0024] As shown in FIG. 3, the exit surface 2 is provided on the opposite side of the entrance surface 1 in the lens 20, and is formed to exit the light incident from the entrance surface 1 into the lens 20 to the outside of the lens 20. The exit surface 2 is formed as a flat surface orthogonal to the light source optical axis A1. However, in the present invention, the exit surface is not limited to a flat surface. The exit surface may be an inclined surface inclined with respect to the second direction, or may be a curved surface.

[0025] [Light distribution control] FIGS. 5 to 7 are diagrams schematically showing the optical paths of the illumination module 100 according to Embodiment 1. In FIGS. 5 to 7, cross-sections orthogonal to the first direction D1 are shown. Also, in FIG. 5, the optical path of the light emitted from the center point CP of the light source 10 is shown, in FIG. 6, the optical path of the light emitted from the light emitting point EP1 located on the opposite side of the irradiation target surface T1 from the center point CP is shown, and in FIG. 7, the optical path of the light emitted from the light emitting point EP2 located on the irradiation target surface T1 side from the center point CP is shown. In FIGS. 5 to 7, the light emitted from the light source 10 and incident on the first entrance surface 11 is defined as light L1, the light emitted from the light source 10 and incident on the second entrance surface 12 is defined as light L2, and the light emitted from the light source 10 and incident on the third entrance surface 13 is defined as light L3.

[0026] As shown in FIGS. 5 to 7, the light L1 emitted from the light source 10 and incident on the first incident surface 11 is refracted at the first incident surface 11 and then travels, is reflected by the first reflection surface 3, and is refracted and emitted at the emission surface 2. The shapes of the first incident surface 11, the first reflection surface 3, and the emission surface 2 are set so that the light L1 is emitted in a direction inclined toward the irradiation target surface T1 with respect to the light source optical axis A1. In this example, since the emission surface 2 is formed as a surface perpendicular to the light source optical axis A1, the first reflection surface 3 reflects the light L1 so that the light L1 incident from the first incident surface 11 reaches the emission surface 2 in a direction inclined toward the irradiation target surface T1. The first reflection surface 3 reflects the light L1 so that the light L1 incident from the first incident surface 11 reaches the emission surface 2 in a direction inclined toward the irradiation target surface T1.

[0027] Also, the light L2 emitted from the light source 10 and incident on the second incident surface 12 is condensed by refraction at the second incident surface 12 and then travels, is reflected by the second reflection surface 4, and is refracted and emitted at the emission surface 2. The shapes of the second incident surface 12, the second reflection surface 4, and the emission surface 2 are set so that the light L2 is emitted in a direction inclined toward the irradiation target surface T1 with respect to the light source optical axis A1. In this example, since the emission surface 2 is formed as a surface perpendicular to the light source optical axis A1, the second reflection surface 4 reflects the light L2 so that the light L2 incident from the second incident surface 12 reaches the emission surface 2 in a direction inclined toward the irradiation target surface T1.

[0028] Also, the light L3 emitted from the light source 10 and incident on the third incident surface 13 is refracted at the third incident surface 13 and then travels, and is refracted and emitted at the emission surface 2. The shapes of the third incident surface 13 and the emission surface 2 are set so that the light L3 is emitted in a direction inclined toward the irradiation target surface T1 with respect to the light source optical axis A1. In this example, since the emission surface 2 is formed as a surface perpendicular to the light source optical axis A1, the third incident surface 13 refracts the light L3 so that the light L3 reaches the emission surface 2 in a direction inclined toward the irradiation target surface T1.

[0029] FIG. 8 is a diagram showing the light distribution pattern of the lighting module 100 according to Embodiment 1. In FIG. 8, the intensity (luminance) in each emission direction of the emitted light of the light distribution pattern is shown at an angle with respect to the light source optical axis A1. In FIG. 8, the 90° direction corresponds to the side of the irradiation target surface T1 in the second direction D2 with respect to the light source optical axis A1, and the -90° direction corresponds to the opposite side of the irradiation target surface T1 in the second direction D2. As described above, the first incident surface 11, the second incident surface 12, the third incident surface 13, the first reflecting surface 3, the second reflecting surface 4, and the emission surface 2 are formed so that the light L1, L2, L3 from the light source 10 is emitted in a direction inclined toward the irradiation target surface T1 with respect to the light source optical axis A1. Therefore, as shown in FIG. 8, the emission direction with the maximum intensity in the light distribution pattern of the entire lighting module 100 is inclined toward the irradiation target surface T1 with respect to the light source optical axis A1. In the lighting module 100 according to Embodiment 1, the shape of each optical surface is such that the inclination angle with respect to the light source optical axis A1 in the emission direction with the maximum intensity in the light distribution pattern is 4° or more and 20° or less. set.

[0030] [Comparative Example] FIG. 9 to FIG. 11 are diagrams schematically showing the optical paths of the illumination module 100X according to the comparative example. In FIGS. 9 to 11, a cross section orthogonal to the first direction D1 is shown. Further, in FIG. 9, the optical path of the light emitted from the center point CP of the light source 10 is shown, in FIG. 10, the optical path of the light emitted from the emission point EP1 is shown, and in FIG. 11, the optical path of the light emitted from the emission point EP2 is shown. As shown in FIGS. 9 to 11, the lens 20X of the illumination module 100X according to the comparative example is different from the illumination module 100 according to Embodiment 1 in that it is symmetrically formed in the second direction D2. Specifically, with the light source optical axis A1 as the axis of symmetry, the first incident surface 11X and the second incident surface 12X are symmetric, and the first reflection surface 3X and the second reflection surface 4X are symmetric. Further, the vertex P1 of the third incident surface 13X is located on the light source optical axis A1. In FIGS. 9 to 11, the light emitted from the light source 10 and incident on the first incident surface 11X is defined as light L4, the light emitted from the light source 10 and incident on the second incident surface 12X is defined as light L5, and the light emitted from the light source 10 and incident on the third incident surface 13X is defined as light L6. As shown in FIG. 9, the lens 20X according to the comparative example is formed so as to emit the light radially emitted from the center point CP of the light source 10 in a direction parallel to the light source optical axis A1. Further, as shown in FIG. 11, the light L6 emitted from the emission point EP2 located on the side of the irradiation target surface T1 with respect to the light source optical axis A1 and incident on the third incident surface 13X is emitted in a direction inclined to the opposite side of the irradiation target surface T1 with respect to the light source optical axis A1. Therefore, when the illumination module 100X according to the comparative example is installed so that the optical axis direction (third direction D3) of the light source 10 is parallel to the irradiation target surface T1 in the same manner as the illumination module 100 according to Embodiment 1, There is a possibility that glare may be generated by the light emitted from the lens 20X to the opposite side of the irradiation target surface T1.

[0031] On the other hand, in the lighting module 100 according to Embodiment 1, by positioning the position of the apex P1 on the third incident surface 13 of the lens 20 on the irradiation target surface T1 side with respect to the light source optical axis A1, as shown in FIG. 7, the light L6 incident on the third incident surface 13 from the light emitting point EP2 located on the irradiation target surface T1 side with respect to the light source optical axis A1 is suppressed from being emitted in a direction inclined to the opposite side of the irradiation target surface T1 with respect to the light source optical axis A1. Therefore, it is possible to reduce glare when the lighting module 100 is installed such that the optical axis direction of the light source 10 is parallel to the irradiation target surface T1.

[0032] [Function and Effect] As described above, the lighting module 100 according to Embodiment 1 is for irradiating light onto an irradiation target surface T1 spaced apart from the light source 10 in the optical axis direction and a second direction D2 orthogonal to the first direction D1, and includes a light source 10 and a cylindrical lens 20 (hereinafter simply referred to as the lens 20) extending in the first direction D1. The lens 20 includes an exit surface 2, a first incident surface 11 provided on the opposite side of the irradiation target surface T1 with respect to the light source optical axis A1, a first reflection surface 3 that reflects the light incident from the first incident surface 11 to the exit surface 2, a second incident surface 12 provided on the opposite side of the first incident surface 11 with respect to the light source optical axis A1, a second reflection surface 4 that reflects the light incident from the second incident surface 12 to the exit surface 2, and a third incident surface 13 provided between the first incident surface 11 and the second incident surface 12 so as to intersect the light source optical axis A1, and guides the light incident from the light source 10 to the exit surface 2. Further, the third incident surface 13 is curved so as to be convex on the light source 10 side in the optical axis direction, and the apex of the third incident surface 13 is located on the irradiation target surface T1 side with respect to the light source optical axis A1.

[0033] According to such a lighting module 100, since the vertex P1 of the third incident surface 13 is located on the side of the irradiation target surface T1 with respect to the light source optical axis A1, the third incident surface 13 intersects the light source optical axis A1 at the opposite third incident surface 131, which is a convex surface on the light source 10 side and approaches the light source as it goes toward the irradiation target surface T1 side. According to this, it is possible to suppress the light L3 incident on the third incident surface 13 from the light emitting point EP2 located on the side of the irradiation target surface T1 with respect to the light source optical axis A1 from being emitted to the opposite side of the irradiation target surface T1. Thereby, according to the lighting module 100, glare can be reduced.

[0034] Furthermore, in the lighting module 100 according to Embodiment 1, the distance d2 between the second reflection point P4 on the second reflection surface 4 at the same position as the first reflection point P3 in the optical axis direction is larger than the distance d1 between the first reflection point P3 on the first reflection surface 3 and the light source optical axis A1 in the second direction D2, so that the first reflection surface 3 and the second reflection surface 4 are formed. According to this, the light L1 incident from the first incident surface 11 and reflected by the first reflection surface 3 and the light L2 incident from the second incident surface 12 and reflected by the second reflection surface 4 can be emitted in a direction inclined toward the irradiation target surface T1 side with respect to the light source optical axis A1. Thereby, in the light distribution pattern of the entire lighting module 100, the emission direction having the maximum intensity can be inclined toward the irradiation target surface T1 side with respect to the light source optical axis A1. As a result, even when the lighting module 100 is installed such that the optical axis direction of the light source 10 is parallel to the irradiation target surface T1, it is possible to illuminate the irradiation target surface T1 far in the optical axis direction.

[0035] Furthermore, in the lighting module 100 according to Embodiment 1, the shape of each optical surface is set such that the emission direction having the maximum intensity in the light distribution pattern is inclined 4° to 20° toward the irradiation target surface T1 side with respect to the light source optical axis A1. Thereby, it is possible to illuminate the irradiation target surface T1 relatively uniformly far in the optical axis direction.

[0036] In the lighting module 100 according to Embodiment 1, the third incident surface 13 includes a connection portion 13a that is connected to the first incident surface 11 and inclined at 35° to 65° with respect to the light source optical axis A1. According to this, the light L3 incident on the connection portion 13a tends to be emitted in a direction inclined 4° to 20° toward the irradiation target surface T1 with respect to the light source optical axis A1. As a result, it becomes easy to incline the emission direction having the maximum intensity in the entire light distribution pattern of the lighting module 1 00 by 4° to 20° toward the irradiation target surface T1 side with respect to the light source optical axis A1.

[0037] In the lighting module 100 according to Embodiment 1, the distance b1 between the light source optical axis A1 and the vertex P1 of the third incident surface 13 is set to be 80% or more of the distance a1 between the light source optical axis A1 and the end on the irradiation target surface T1 side of the light source 10. By setting the position of the vertex P1 in this way, the light L3 incident on the third incident surface 13 tends to be emitted in a direction inclined 4° to 20° toward the irradiation target surface T1 side with respect to the light source optical axis A1. Also by this, it becomes easy to incline the emission direction having the maximum intensity in the light distribution pattern by 4° to 20° toward the irradiation target surface T1 side with respect to the light source optical axis A1 to occur.

[0038] Furthermore, in the lighting module 100 according to Embodiment 1, the first reflecting surface 3 is represented by the aspherical formula (1) and is set to K ≤ -0.5. As a result, the light L1 incident from the first incident surface 11 and reflected by the first reflecting surface 3 tends to be emitted in a direction inclined 4° to 20° toward the irradiation target surface T1 side with respect to the light source optical axis A1. Also, in the lighting module 100 according to Embodiment 1, the second reflecting surface 4 is also represented by the aspherical formula (1) and is set to K ≤ -1. As a result, the light L2 incident from the second incident surface 12 and reflected by the second reflecting surface 4 tends to be emitted in a direction inclined 4° to 20° toward the irradiation target surface T1 side with respect to the light source optical axis A1. By forming the first reflecting surface 3 and the second reflecting surface 4 in this way as well, it becomes easy to incline the emission direction having the maximum intensity in the light distribution pattern by 4° to 20° toward the irradiation target surface T1 side with respect to the light source optical axis A1. surface 12 and reflected by the second reflecting surface 4 tends to be emitted in a direction inclined 4° to 20° toward the irradiation target surface T1 side with respect to the light source optical axis A1. By forming the first reflecting surface 3 and the second reflecting surface 4 in this way as well, it becomes easy to incline the emission direction having the maximum intensity in the light distribution pattern by 4° to 20° toward the irradiation target surface T1 side with respect to the light source optical axis A1. to occur.

[0039] Furthermore, in the lighting module 100 according to the first embodiment, the light source 10 is formed in a long and narrow shape in the extension direction (first direction D1) of the lens 20. Here, as a means for increasing the amount of light (luminous flux) of light irradiated from the lighting module, the area of ​​the light emitting surface of the light source is increased to increase the amount of light from the light source. In this case, it is considered to increase the amount of light from the light source by increasing the width of the light source in the second direction, which is a direction perpendicular to the extension direction of the cylindrical lens. However, if it is attempted to maintain the light distribution pattern while increasing the width of the light source, the cylindrical lens must be similarly enlarged in the second direction (width direction) and the third direction (optical axis direction), which may lead to an increase in the size of the lighting module. In this regard, the lighting module 100 according to the first embodiment has the light source 10 formed in a long and narrow shape in the extension direction (first direction D1) of the lens 20, so that it is possible to ensure the amount of light from the light source while suppressing the increase in size of the lens 20 in the width direction and the optical axis direction. In other words, it is possible to realize a reduction in size of the lighting module 100 and a large amount of light.

[0040] [Variation 1] Fig. 12 is a cross-sectional view of a lighting module 100A according to Modification 1 of the first embodiment. Fig. 12 shows a cross section perpendicular to the first direction D1. The lighting module 100A according to Modification 1 differs from the lighting module 100 described in Fig. 3 and the like in that the lens 20A includes an R surface 14 that connects the second incident surface 12 and the third incident surface 13. As shown in Fig. 12, the R surface 14 is formed as a curved surface that has an arc shape in a cross section perpendicular to the first direction D1 and is curved so as to be convex on the side opposite the light source 10 in the optical axis direction. In other words, the R surface 14 is formed as a curved surface in which the lens material is recessed on the side opposite the light source.

[0041] Here, as in the above-described lighting module 100, when the connection portion between the second entrance surface 12 and the third entrance surface 13 is edge-shaped, when the lighting module 100 irradiates the illumination target surface T1 with light, the light distribution pattern formed by the light L2 incident on the second entrance surface 12 and the third entrance surface 13 are different from each other. There is a possibility that a dark portion (black spot), which is a region where the illuminance is lower than the surroundings, is formed between the light distribution pattern formed by the light L3 incident on the third incident surface 13. On the other hand, in the lighting module 100A, since the second incident surface 12 and the third incident surface 13 are smoothly connected by a rounded R surface 14, a light distribution pattern formed by the light incident from the R surface 14 is formed between the light distribution pattern by the light L2 incident from the second incident surface 12 and the light distribution pattern by the light L3 incident from the third incident surface 13. Thereby, the dark portion can be reduced and the irradiation target surface T1 can be illuminated uniformly. At this time, it is preferable that the radius of curvature of the R surface 14 is 0.1 mm or more This is preferable from the viewpoint of reducing the dark portion. However, the radius of curvature of the R surface according to the present invention is not limited thereto.

[0042] [Modification 2] FIG. 13 is a cross-sectional view of a lighting module 100B according to Modification 2 of Embodiment 1. In FIG. 13, a cross-section orthogonal to the first direction D1 is shown. The lighting module 100B according to Modification 2 is different from the lighting module 100 described with reference to FIG. 3 and the like in that the lens 20B includes a diffusion surface 15 that connects the second incident surface 12 and the third incident surface 13. The diffusion surface 15 is provided so as to be orthogonal to the optical axis direction. The diffusion surface 15 is subjected to a diffusion process so that the light incident on the diffusion surface can be diffused. Specifically, the diffusion surface 15 in this example is a dimpled surface in which a fine concavo-convex pattern (pattern) is formed by dimpling. In the lighting module 100B, by disposing the diffusion surface 15 that diffuses the incident light between the second incident surface 12 and the third incident surface 13, the dark portion of the irradiation target surface T1 can be reduced and the irradiation target surface T1 can be illuminated uniformly. Here, FIG. 14 is a diagram for explaining an example of the diffusion surface. FIG. 14(A) is an enlarged view of the diffusion surface 16, and FIG. 14(B) is a cross-sectional view taken along line A-A of FIG. 14(A). The diffusion surface according to the present invention may be formed as a lens array formed in an uneven shape by arranging a plurality of convex lens surfaces 16a as in the diffusion surface 16 shown in FIG. 14.

[0043] [Modification 3] In addition, in the lighting module 100 according to Embodiment 1, the emission surface 2 may be formed so as to diffuse the light emitted from the emission surface 2. Thereby, it is possible to reduce the color unevenness of the light distribution pattern caused by the color unevenness of the light source 10. For example, the emitted light may be diffused by forming the emission surface 2 in an uneven shape such as the above-described embossed surface or lens array. FIG. 15 is a cross-sectional view of a lighting module 100C according to Modification 3 of Embodiment 1. In the lighting module 100C, as an example, the emission surface 2 is formed as a lens array. Thereby, the light emitted from the emission surface 2 can be diffused.

[0044] <Embodiment 2> FIG. 16 is an overall perspective view of a lighting module 200 according to Embodiment 2. Further, FIG. 17 is a diagram showing a usage example of the lighting module 200 according to Embodiment 2. As shown in FIG. 16, the lighting module 200 according to Embodiment 2 includes a light source 10, a cylindrical lens 40 (hereinafter simply referred to as a lens 40), and a substrate 30. As shown in FIG. 17, the lighting module 200 is used for a lighting device 2000 for illuminating an irradiation target surface T1, and is configured to irradiate the light L10 to the irradiation target surface T1 separated from the light source 10 in the second direction D2, similarly to the lighting module 100. The shape of the lens 40 of the lighting module 200 is different from that of the lens 20 according to Embodiment 1. Hereinafter, the lighting module 200 according to Embodiment 2 will be described centering on the differences from the lighting module 100 according to Embodiment 1, and detailed description of the same configurations will be omitted by assigning the same reference numerals.

[0045] [Lens shape] As shown in FIG. 16, the lens 40 is formed as a cylindrical lens extending in the first direction D1. The lens 40 is arranged side by side with the light source 10 in the optical axis direction (third direction D3) and is aligned with the light source 10 at a predetermined position. The The material is the same as that of the lens 20. FIG. 18 is a cross-sectional view of the lighting module 200 according to Embodiment 2. In FIG. 18, a cross-section orthogonal to the first direction D1 is shown. As shown in FIG. 18, the lens 40 is formed asymmetrically in the second direction D2 and includes an incident surface 5, an exit surface 6, and a reflection surface 7.

[0046] As shown in FIG. 18, the incident surface 5 is provided on the light source 10 side of the lens 40 and is the surface on which the light emitted from the light source 10 is incident. The incident surface 5 is formed as a cylindrical surface having no curvature in the first direction D1 and having curvature in the second direction D2 and the third direction D3. The incident surface 5 includes a first incident surface 51 and a second incident surface 52.

[0047] As shown in FIG. 18, the first incident surface 51 is provided on the side opposite to the irradiation target surface T1 with respect to the light source optical axis A1 and is formed to refract a part of the light emitted from the light source 10 and guide it to the reflection surface 7. The first incident surface 51 corresponds to the "opposite-side incident surface" according to the present invention. The first incident surface 51 is inclined so as to approach the light source optical axis A1 as it moves away from the light source 10 in the third direction D3.

[0048] As shown in FIG. 18, the second incident surface 52 is provided closer to the irradiation target surface T1 than the first incident surface 51 so as to intersect the light source optical axis A1, and is formed to refract a part of the light emitted from the light source 10 and guide it to the exit surface 6. Specifically, the second incident surface 52 has an aspherical shape that is asymmetric in the second direction D2, and is formed so that the whole approaches the light source 10 in the optical axis direction as it moves toward the irradiation target surface T1 side in the second direction D2. The second incident surface 52 corresponds to the "optical-axis incident surface" according to the present invention.

[0049] As shown in FIG. 18, the second incident surface 52 includes a convex incident surface 521 and a concave incident surface 522 whose convex directions are different from each other. The convex incident surface 521 is convexly curved toward the light source 10 side in the optical axis direction. The concave incident surface 522 is provided on the irradiation target surface T1 side with respect to the convex incident surface 521 and is convexly curved on the opposite side of the light source 10 in the optical axis direction. That is, the concave incident surface 522 is formed as a curved surface where the lens material is recessed toward the side opposite to the light source. The convex incident surface 521 and the concave incident surface 522 are connected via an inflection point P5. Note that the "inflection point" is a point on the aspherical surface where the sign of the second derivative value of the aspherical shape curve of the lens cross-sectional shape is reversed. That is, the inflection point P5 is the point where the shape of the second incident surface 52 switches between convex and concave.

[0050] As shown in FIG. 18, the inflection point P5 of the second incident surface 52 is located on the irradiation target surface T1 side with respect to the light source optical axis A1. Here, let the distance between the light source optical axis A1 and the inflection point P5 be b2. At this time, the second incident surface 52 is formed such that b2 is larger than 80% of the distance a1 between the light source optical axis A1 and the end portion of the light emitting surface 10a of the light source 10 on the irradiation target surface T1 side. That is, the inflection point P5 is located on the irradiation target surface T1 side with respect to the position of 80% of the distance from the light source optical axis A1 to the end portion of the light source 10 on the irradiation target surface T1 side.

[0051] Also, as shown in FIG. 18, the end portion of the convex incident surface 521 on the side opposite to the irradiation target surface T1 is connected to the first incident surface 51. Here, let the inclination angle of the connecting portion 521a, which is a part of the convex incident surface 521 and is the portion connected to the first incident surface 51, with respect to the light source optical axis A1 be θ2. At this time, the convex incident surface 521 is formed such that 35° ≤ θ2 ≤ 65°.

[0052] FIG. 19 is an enlarged view of the second incident surface 52. As shown in FIG. 19, the convex incident surface 521 is formed by a part of the curve CL1. The curve CL1 is convex toward the light source 10 in the optical axis direction and its vertex P6 is located on the irradiation target surface T1 side of the inflection point P5. Therefore, the convex incident surface 521 is formed as a curved surface that is convex toward the light source 10 and approaches the light source 10 as it goes toward the irradiation target surface T1 side. Also, the convex incident surface 521 can be represented by the above-described aspherical formula (1). In the case of the convex incident surface 521, in the above formula (1), y is the distance from the vertex P6 in the second direction D2, x is the displacement amount in the optical axis direction from the vertex P6 at the position of y, R is the vertex curvature radius of the original sphere, K is the conic constant, and A to E are aspherical coefficients. At this time, the convex incident surface 521 of this example is set so that K ≤ -1.

[0053] IP2 in FIG. 19 indicates the intersection of the second incident surface 52 and the light source optical axis A1. The intersection IP2 is formed on the convex incident surface 521. Since the inflection point P5 of the second incident surface 52 is located on the irradiation target surface T1 side of the light source optical axis A1, the second incident surface 52 intersects the light source optical axis A1 at the convex incident surface 521. That is, similar to the illumination module 100 according to the first embodiment, the illumination module 200 according to the second embodiment is configured such that the incident surface of the cylindrical lens is a curved surface that is convex toward the light source 10 and approaches the light source as it goes toward the irradiation target surface T1 side and intersects the light source optical axis A1.

[0054] Also, as shown in FIG. 19, the concave incident surface 522 is formed by a part of the curve CL2. The curve CL2 is convexly curved on the opposite side of the light source 10 in the optical axis direction, and its apex P7 is located on the opposite side of the irradiation target surface T1 from the inflection point P5. Therefore, the concave incident surface 522 is formed as a curved surface that is convex on the opposite side of the light source 10 and approaches the light source 10 as it goes toward the irradiation target surface T1 side. Further, the shape of the concave incident surface 522 can be represented by the above formula (1). In the case of the concave incident surface 522, in the above formula (1), y is the distance from the apex P7 in the second direction D2, and x is the displacement amount in the optical axis direction from the apex P7 at the position of y. At this time, the concave incident surface 522 of this example is set so that K≤0.

[0055] As shown in FIG. 18, the reflecting surface 7 is provided on the opposite side of the irradiation target surface T1 with respect to the light source optical axis A1, and is formed so as to internally totally reflect almost all of the light incident from the first incident surface 51 and guide it to the first emission surface 61 (described later) of the emission surface 6. The reflecting surface 7 is formed as a cylindrical surface having no curvature in the first direction D1 and having curvatures in the second direction D2 and the third direction D3. The reflecting surface 7 is inclined so as to move away from the light source optical axis A1 as it moves away from the light source 10 in the third direction D3. Here, the shape of the reflecting surface 7 of this example can be represented by the above formula (1). In the case of the reflecting surface 7, in the above formula (1), y is the distance from the apex in the second direction D2, and x is the displacement amount in the optical axis direction from the apex at the position of y. At this time, the reflecting surface 7 of this example is set so that K≤−0.5.

[0056] As shown in FIG. 18, the exit surface 6 is provided on the opposite side of the entrance surface 5 in the lens 40, and is formed to emit the light incident from the entrance surface 5 into the interior of the lens 40 to the outside of the lens 40. The exit surface 6 includes a first exit surface 61 orthogonal to the light source optical axis A1, and a second exit surface 62 provided closer to the irradiation target surface T1 than the first exit surface 61. The first exit surface 61 is formed as a flat surface orthogonal to the light source optical axis A1. However, in the present invention, the first exit surface is not limited to a flat surface. The first exit surface may be an inclined surface inclined with respect to the second direction, or may be a curved surface. The second exit surface 62 is provided closer to the irradiation target surface T1 than the light source optical axis A1, and is curved convexly on the opposite side of the light source 10 in the optical axis direction, and is formed to approach the light source 10 in the optical axis direction as it goes toward the irradiation target surface T1 side in the second direction D2.

[0057] [Light distribution control] FIGS. 20 to 22 are diagrams schematically showing the optical paths of the illumination module 200 according to Embodiment 2. In FIGS. 20 to 22, cross-sections orthogonal to the first direction D1 are shown. Further, in FIG. 20, the optical path of the light emitted from the center point CP of the light source 10 is shown, and in FIG. 21, the optical path of the light emitted from the light emission point EP1 is shown. The optical path of the light emitted from the light emission point EP2 is shown in FIG. 22. In FIGS. 20 to 22, the light emitted from the light source 10 and incident on the first entrance surface 51 is defined as light L7, the light emitted from the light source 10 and incident on the convex entrance surface 521 is defined as light L8, and the light emitted from the light source 10 and incident on the concave entrance surface 522 is defined as light L9.

[0058] As shown in FIGS. 20 to 22, the light L7 emitted from the light source 10 and incident on the first incident surface 51 is refracted at the first incident surface 51 and then travels, reflected by the reflecting surface 7, and refracted and emitted at the first emission surface 61 of the emission surface 6. The shapes of the first incident surface 51, the reflecting surface 7, and the first emission surface 61 are set so that the light L7 is emitted in a direction inclined toward the irradiation target surface T1 with respect to the light source optical axis A1. In this example, since the first emission surface 61 is formed as a surface orthogonal to the light source optical axis A1, the reflecting surface 7 reflects the light L7 so that the light L7 incident from the first incident surface 51 reaches the first emission surface 61 in a direction inclined toward the irradiation target surface T1 side.

[0059] Also, the light L8 emitted from the light source 10 and incident on the convex incident surface 521 is condensed by refraction at the convex incident surface 521 and then travels, refracted and emitted at the first emission surface 61 or the second emission surface 62. The shapes of the convex incident surface 521 and the emission surface 6 are set so that the light L8 is emitted in a direction inclined toward the irradiation target surface T1 with respect to the light source optical axis A1.

[0060] Also, the light L9 emitted from the light source 10 and incident on the concave incident surface 522 is refracted at the concave incident surface 522 and then travels, refracted and emitted at the second emission surface 62. The shapes of the concave incident surface 522 and the second emission surface 62 are set so that the light L9 is emitted in a direction inclined toward the irradiation target surface T1 with respect to the light source optical axis A1.

[0061] Also, as shown in FIGS. 20 to 22, in the illumination module 200 according to the second embodiment, by positioning the inflection point P5 of the second incident surface 52 on the irradiation target surface T1 side rather than the light source optical axis A1, the light L9 incident on the second incident surface 52 from the light emitting point EP2 located on the irradiation target surface T1 side rather than the light source optical axis A1 is suppressed from being emitted in a direction inclined toward the opposite side of the irradiation target surface T1 with respect to the light source optical axis A1. Therefore, it is possible to reduce glare when the illumination module 200 is installed such that the optical axis direction of the light source 10 is parallel to the irradiation target surface T1.

[0062] FIG. 23 is a diagram showing the light distribution pattern of the lighting module 200. In FIG. 23, the intensity (luminance) in each emission direction of the emitted light of the light distribution pattern is shown at an angle with respect to the light source optical axis A1. In FIG. 23, the 90° direction corresponds to the side of the irradiation target surface T1 in the second direction D2 with respect to the light source optical axis A1, and the -90° direction corresponds to the opposite side of the irradiation target surface T1 in the second direction D2. As described above, the first incident surface 51, the convex incident surface 521, the concave incident surface 522, the emission surface 6, and the reflection surface 7 are formed so that the lights L7, L8, and L9 from the light source 10 are emitted in a direction inclined toward the irradiation target surface T1 with respect to the light source optical axis A1. Therefore, as shown in FIG. 23, the emission direction with the maximum intensity in the light distribution pattern of the entire lighting module 200 is inclined toward the irradiation target surface T1 with respect to the light source optical axis A1. In the lighting module 200 according to Embodiment 2, the shape of each optical surface is set so that the inclination angle with respect to the light source optical axis A1 in the emission direction with the maximum intensity in the light distribution pattern is 4° or more and 20° or less.

[0063] FIG. 24 is a diagram showing the optical path of the light emitted from the light source 10 and reflected by the second incident surface 52 in the lighting module 200 according to Embodiment 2. FIG. 25 is a diagram showing the optical path of the light emitted from the light source 10 and reflected by the second incident surface 12X in the lighting module 100X according to the comparative example.

[0064] As shown in FIG. 25, in the lighting module 100X according to the comparative example, the light RL2 reflected by the second incident surface 12X enters the third incident surface 13 and is emitted from the emission surface 2, and as a result, is emitted in a direction inclined toward the opposite side of the irradiation target surface T1 with respect to the light source optical axis A1. Therefore, when the lighting module 100X according to the comparative example is installed so that the optical axis direction (third direction D3) of the light source 10 is parallel to the irradiation target surface T1, glare may be generated by the light RL2 reflected by the second incident surface 12X. When the lighting module 100X according to the comparative example is installed so that the optical axis direction (third direction D3) of the light source 10 is parallel to the irradiation target surface T1, glare may be generated by the light RL2 reflected by the second incident surface 12X.

[0065] On the other hand, as shown in FIG. 24, in the lighting module 200 according to the second embodiment, the second incident surface 52 is formed such that the light RL1 reflected by the second incident surface 52 is reflected in a direction inclined toward the irradiation target surface T1 with respect to the light source optical axis A1, that is, the second incident surface 52 is formed to approach the light source 10 in the optical axis direction as it goes toward the irradiation target surface T1 side. Therefore, it is suppressed that the light RL1 reflected by the second incident surface 52 is emitted in a direction inclined to the opposite side of the irradiation target surface T1 with respect to the light source optical axis A1. As a result, when the lighting module 200 is installed such that the optical axis direction of the light source 10 is parallel to the irradiation target surface T1, glare caused by the light RL1 reflected by the second incident surface 52 can be reduced.

[0066] [Operation and Effect] As described above, the lighting module 200 according to the second embodiment is for irradiating light to the irradiation target surface T1 spaced apart from the light source 10 in the optical axis direction and the second direction D2 orthogonal to the first direction D1, and includes the light source 10 and the cylindrical lens 40 extending in the first direction D1. The lens 40 includes an exit surface 6, a first incident surface 51 provided on the opposite side of the irradiation target surface T1 with respect to the light source optical axis A1, a reflecting surface 7 that reflects the light incident from the first incident surface 51 to the exit surface 6, and a second incident surface 52 provided on the irradiation target surface T1 side closer to the irradiation target surface T1 than the first incident surface 51 so as to intersect the light source optical axis A1 and guiding the light incident from the light source 10 to the exit surface 6. The second incident surface 52 intersects the light source optical axis A1 at a convex incident surface 521 that is convex toward the light source 10 side and is a curved surface that approaches the light source 10 as it goes toward the irradiation target surface T1 side. Further, the second incident surface 52 is formed to approach the light source 10 in the optical axis direction as it goes toward the irradiation target surface T1 side.

[0067] According to such a lighting module 200, since the second incident surface 52 is a convex incident surface 521 that intersects the light source optical axis A1, it is possible to suppress the light L8 incident on the second incident surface 52 from the light emitting point EP2 located on the side of the irradiation target surface T1 with respect to the light source optical axis A1 from being emitted to the opposite side of the irradiation target surface T1. Further, according to the lighting module 200, since the second incident surface 52 is formed so as to approach the light source 10 in the optical axis direction as it goes toward the irradiation target surface T1 side, the reflected light RL1 reflected by the second incident surface 52 can be reflected in a direction inclined toward the irradiation target surface T1 with respect to the light source optical axis A1. As a result, it is possible to suppress the light RL1 reflected by the second incident surface 52 from being emitted in a direction inclined to the opposite side of the irradiation target surface T1 with respect to the light source optical axis A1. As a result, glare caused by the light RL1 reflected by the second incident surface 52 can be reduced.

[0068] Further, in the lighting module 200 according to Embodiment 2, the second incident surface 52 includes a convex incident surface 521 that is convexly curved toward the light source 10 side in the optical axis direction, and is provided on the irradiation target surface T1 side with respect to the convex incident surface 521, and is convexly curved on the opposite side of the light source 10 and is connected to the convex incident surface 521 via an inflection point P5. a concave incident surface 522. As a result, among the light emitted from the light source to the second incident surface 52, the light with a relatively small emission angle with respect to the light source optical axis A1 reaches the convex incident surface 521, and the light with a relatively large inclination angle with respect to the light source optical axis A1 reaches the concave incident surface 522. As a result, while the convex incident surface 521 condenses the light, the reflected light RL1 reflected by the concave incident surface 522 can be reflected in a direction inclined toward the irradiation target surface T1 with respect to the light source optical axis A1.

[0069] Furthermore, in the lighting module 200 according to Embodiment 2, the inflection point P5 of the second incident surface 52 is located on the irradiation target surface T1 side with respect to the light source optical axis A1. According to this, it is possible to suppress the light L9 incident on the second incident surface 52 from the light emitting point EP2 located on the irradiation target surface T1 side with respect to the light source optical axis A1 from being emitted to the opposite side of the irradiation target surface T1. As a result, glare can be reduced. can be done.

[0070] Also, in the lighting module 200 according to Embodiment 2, the distance b2 between the light source optical axis A1 and the inflection point P5 of the second incident surface 52 is set to be 80% or more of the distance a1 between the light source optical axis A1 and the end portion on the irradiation target surface T1 side of the light source 10. By setting the position of the inflection point P5 in this way, the light L8 and L9 incident on the second incident surface 52 tend to be emitted in a direction inclined 4° to 20° toward the irradiation target surface T1 with respect to the light source optical axis A1. Also by this, it becomes easy to incline the emission direction having the maximum intensity in the light distribution pattern by 4° to 20° toward the irradiation target surface T1 with respect to the light source optical axis A1. In the light distribution pattern, the emission direction having the maximum intensity is inclined 4° to 20 ° toward the irradiation target surface T1 with respect to the light source optical axis A1.

[0071] Also, in the lighting module 200 according to Embodiment 2, the convex incident surface 521 includes a connection portion 521a that is connected to the first incident surface 51 and is inclined 35° to 65° with respect to the light source optical axis A1. According to this, the light L8 incident on the connection portion 521a tends to be emitted in a direction inclined 4° to 20° toward the irradiation target surface T1 with respect to the light source optical axis A1. Thereby, it becomes easy to incline the emission direction having the maximum intensity in the light distribution pattern of the entire lighting module 200 by 4° to 20° toward the irradiation target surface T1 with respect to the light source optical axis A1. In the light distribution pattern of the entire lighting module 200, the emission direction having the maximum intensity is inclined 4° to 20° toward the irradiation target surface T1 with respect to the light source optical axis A1.

[0072] In addition, in the lighting module 200 according to Embodiment 2, the emission surface 6 includes a first emission surface 61 orthogonal to the light source optical axis A1 and a second emission surface 62 provided on the side of the irradiation target surface T1 with respect to the first emission surface 61. The concave incident surface 522 is formed to guide the light incident from the light source 10 to the second emission surface 62. The second emission surface 62 is convexly curved on the opposite side of the light source 10 and is formed so as to approach the light source 10 in the optical axis direction as it goes toward the irradiation target surface T1 side. As shown in FIGS. 20 to 22, the light reaching the second emission surface 62 from the concave incident surface 522 is inclined toward the irradiation target surface T1 side with respect to the light source optical axis A1, and the inclination angle is relatively large. However, by forming the second emission surface 62 in the above-described shape, the emission direction of the light emitted from the second emission surface 62 can be inclined toward the light source optical axis A1 side, and the inclination angle can be suppressed. Thereby, the light is condensed, and the irradiation target surface T1 can be illuminated far in the optical axis direction.

[0073] In addition, in the lighting module 200 according to Embodiment 2, the reflection surface 7 is formed such that substantially all of the light L7 incident from the first incident surface 51 is reflected by the reflection surface 7 and emitted from the first emission surface 61 in a direction inclined toward the irradiation target surface T1 side with respect to the light source optical axis A1. Thereby, the emission direction having the maximum intensity in the light distribution pattern of the entire lighting module 200 can be inclined toward the irradiation target surface T1 side with respect to the light source optical axis A1.

[0074] Furthermore, in the lighting module 200 according to Embodiment 2, the convex incident surface 521 is represented by the aspherical formula (1) and is set to K ≤ -1. As a result, the light L8 incident on the convex incident surface 521 tends to be emitted in a direction inclined 4° to 20° toward the irradiation target surface T1 side with respect to the light source optical axis A1. This also makes it easy to incline the emission direction having the maximum intensity in the light distribution pattern 4° to 20° toward the irradiation target surface T1 side with respect to the light source optical axis A1.

[0075] Furthermore, in the lighting module 200 according to Embodiment 2, the concave incident surface 522 is represented by the aspherical formula (1) and is set such that K ≤ 0. As a result, the light L9 incident on the concave incident surface 522 tends to be emitted in a direction inclined by 4° to 20° toward the irradiation target surface T1 with respect to the light source optical axis A1 and this occurs. Also due to this, it becomes easy to incline the emission direction having the maximum intensity in the light distribution pattern by 4° to 20° toward the irradiation target surface T1 with respect to the light source optical axis A1.

[0076] Furthermore, in the lighting module 200 according to Embodiment 2, the reflecting surface 7 is represented by the aspherical formula (1) and is set such that K ≤ -0.5. As a result, the light L7 incident from the first incident surface 51 and reflected by the reflecting surface 7 tends to be emitted in a direction inclined by 4° to 20° toward the irradiation target surface T1 with respect to the light source optical axis A1 and this occurs. Also due to this, it becomes easy to incline the emission direction having the maximum intensity in the light distribution pattern by 4° to 20° toward the irradiation target surface T1 with respect to the light source optical axis A1.

[0077] Furthermore, in the lighting module 200 according to Embodiment 2, the shape of each optical surface is set such that the emission direction having the maximum intensity in the light distribution pattern is inclined by 4° to 20° toward the irradiation target surface T1 with respect to the light source optical axis A1. Thereby, the irradiation target surface T1 can be illuminated relatively uniformly over a long distance in the optical axis direction.

[0078] Furthermore, the lighting module 200 according to Embodiment 2 uses a light source 10 having an elongated shape that is long in the extending direction (first direction D1) of the cylindrical lens 40, thereby suppressing an increase in the size of the lens 20 while ensuring the light quantity of the light source. That is, miniaturization and high light quantity of the lighting module 200 can be achieved.

[0079] Note that, also in the lighting module 200 according to the second embodiment, the emission surface 6 may be formed so as to diffuse the light emitted from the emission surface 6. Thereby, it is possible to reduce the color unevenness of the light distribution pattern due to the color unevenness of the light source 10. For example, the emitted light may be diffused by forming the emission surface 6 as a matte surface or a lens array.

[0080] <Light distribution test> The following Light distribution tests were conducted on Example 1, Example 2, Example 3, and the Comparative Example, and the light distribution patterns were compared.

[0081] [Example 1] Example 1 corresponds to the lighting module 100 according to the first embodiment described with reference to FIG. 3 and the like.

[0082] [Example 2] Example 2 corresponds to the lighting module 100A according to the first modification described with reference to FIG. 12 and the like. In Example 2, the radius of curvature of the R surface connecting the second incident surface and the third incident surface was set to 0.1 mm or more.

[0083] [Example 3] Example 3 corresponds to the lighting module 200 according to the second embodiment described with reference to FIG. 18 and the like.

[0084] [Comparative Example] The Comparative Example corresponds to the lighting module 100X according to the modification described with reference to FIG. 9 and the like.

[0085] [Test method] FIG. 26 is a diagram for explaining the light distribution test. The XYZ coordinate axes in FIG. 26 are a coordinate system for explaining the relative relationship between the lighting module used in the test and the irradiation target surface. In the light distribution test, the irradiation target surface was arranged so as to be orthogonal to the X axis, the lighting module was arranged at a position separated from the irradiation target surface in the X axis direction, and the lighting module was irradiated with light. In Examples 1 to 3, the lighting module was installed so that the light source optical axis was parallel to the Z axis, and in the Comparative Example, the lighting module was installed so that the light source optical axis was inclined by 6.5° with respect to the Z axis toward the irradiation target surface side.

[0086] [Test Results] FIG. 27 is a diagram showing the results of the luminous intensity distribution. FIG. 27(A) is a diagram showing the luminous intensity distribution with respect to the angle around the Y-axis with the Z-axis direction being 0°, and FIG. 27(B) is a diagram showing the luminous intensity distribution with respect to the angle around the X-axis with the Z-axis direction being 0°. On the horizontal axis of FIG. 27(A), the positive side corresponds to the +X side (the irradiation target surface side) based on the light source optical axis, and the negative side corresponds to the -X axis side (the opposite side of the irradiation target surface). On the horizontal axis of FIG. 27(B), the positive side corresponds to the +Y side based on the light source optical axis, and the negative side corresponds to the -Y side. In FIGS. 27(A) and (B), the luminous intensity distributions of Example 1, Example 3, and the comparative example are shown. As shown by the results of FIG. 27(A), it was confirmed that in the lighting modules of Example 1 and Example 3, the emission direction with the maximum intensity in the light distribution pattern is inclined by about 6.5° to the +X side (the irradiation target surface side). Thus, it was confirmed that even when the lighting modules of Example 1 and Example 3 are installed such that the light source optical axis is parallel to the Z-axis, the light distribution pattern can be inclined toward the irradiation target surface side to irradiate light. Also, as shown by the results of FIG. 27(B), it was confirmed that in Example 1 and Example 3, the luminous intensity in the front of the lighting module is smaller than that of the comparative example, that is, there is less glare in the front. This is because the lens of the lighting module is a cylindrical lens extending in the Y-axis direction and has the same cross-sectional shape in the Y-axis direction. That is, the light incident on the lens inclined to the +Y side or -Y side with respect to the light source optical axis is also emitted inclined to the +X side (the irradiation target surface side).

[0087] ​Figures 28 to 31 are diagrams showing the results of the illuminance distribution. Figure 28 shows the illuminance distribution of Example 1, Figure 29 shows the illuminance distribution of Example 2, Figure 30 shows the illuminance distribution of Example 3, and Figure 31 shows the illuminance distribution of the comparative example. In Figures 28 to 31, BS indicates a dark part (black spot) where the illuminance is lower than the surroundings, and HS indicates a bright part (hot spot) where the illuminance is higher than the surroundings. It can be said that a more uniform light distribution pattern is obtained when there are fewer dark parts BS and bright parts HS. As shown in Figure 28, in Example 1, one dark part BS and one bright part HS were formed. As shown in Figure 29, in Example 2, no dark part BS was formed, and one bright part HS was formed. As shown in Figure 30, in Example 3, one dark part BS was formed, and no bright part HS was formed. As shown in Figure 31, in the comparative example, two dark parts BS and two bright parts HS were formed. By comparing Examples 1 to 3 with the comparative example, it was confirmed that Examples 1 to 3 have fewer dark parts BS and bright parts HS than the comparative example, and a more uniform light distribution pattern can be obtained. Also, by comparing Example 1 and Example 2, it was confirmed that providing an R surface between the second incident surface and the third incident surface reduces the dark part BS.

[0088] <Others> Hereinafter, some common points between the lighting module according to Embodiment 1 and the lighting module according to Embodiment 2 will be listed. First, in Embodiment 1 and Embodiment 2, the incident surface of the cylindrical lens is a convex surface on the light source side and is a curved surface that approaches the light source as it goes toward the irradiation target surface side, and is configured to intersect the optical axis of the light source. Also, in Embodiment 1 and Embodiment 2, the cylindrical lens includes a reflecting surface that reflects the light incident from the first incident surface to the exit surface. Also, in Embodiment 1 and Embodiment 2, the cylindrical lens includes a reflecting surface that reflects the light incident from the first incident surface orthogonal to the optical axis direction to the exit surface. Also, in Embodiment 1 and Embodiment 2, the exit surface of the cylindrical lens is formed to include a flat surface orthogonal to the light source optical axis. Note that the above-listed common points are not all, and the above common points do not limit the present invention.

[0089] As described above, the preferred embodiments of the present disclosure have been explained. However, each aspect disclosed in this specification can be combined with any other features disclosed in this specification.

Explanation of Signs

[0090] 100… Lighting module, 10… Light source, 20… Cylindrical lens, 11… First incident surface, 12… Second incident surface, 13… Third incident surface, 2… Exit surface, 3… First reflecting surface, 4… Second reflecting surface, A1… Light source optical axis, T1… Illumination target surface

Claims

1. A lighting module for irradiating light onto an irradiation target surface spaced apart from a light source in a second direction orthogonal to the optical axis direction of the light source and a first direction extending in a direction orthogonal to the optical axis direction of the light source, the lighting module comprising: the cylindrical lens, an exit surface, a first incident surface provided on the opposite side of the irradiation target surface with respect to the optical axis of the light source, a second incident surface provided on the opposite side of the first incident surface with respect to the optical axis, and a third incident surface provided on the irradiation target surface side of the first incident surface so as to intersect the optical axis and provided between the first incident surface and the second incident surface for guiding the light incident from the light source to the exit surface; a first reflecting surface for reflecting the light incident from the first incident surface to the exit surface; a second reflecting surface for reflecting the light incident from the second incident surface to the exit surface; including the third incident surface is convex on the light source side and is formed as a curved surface that approaches the light source as it goes toward the irradiation target surface and intersects the optical axis, and is curved so as to be convex on the light source side in the optical axis direction; the apex of the third incident surface is located on the irradiation target surface side of the optical axis; comprising a diffusion surface that connects the third incident surface and the second incident surface and diffuses the light incident from the light source; a lighting module.

2. The distance in the second direction between the optical axis and a first reflection point, which is an arbitrary point on the first reflecting surface, is smaller than the distance in the second direction between the optical axis and a second reflection point, which is a point on the second reflecting surface and is located at the same position as the first reflection point in the optical axis direction. The lighting module according to claim 1.

3. Further comprising a curved surface that connects the second incident surface and the third incident surface and is curved so as to be convex on the side opposite to the light source; The lighting module according to claim 1 or 2.

4. The radius of curvature of the curved surface is 0.1 mm or more. The lighting module according to claim 3.

5. The distance between the optical axis and the apex of the third incident surface is 80% or more of the distance between the optical axis and the end of the light source on the irradiation target surface side. The lighting module according to any one of claims 1 to 4.

6. The second reflecting surface is represented by the following aspherical formula and K ≤ -1. The lighting module according to any one of claims 1 to 5. ​ However, in the above formula, y is the distance from the vertex in the second direction, x is the displacement amount in the optical axis direction from the vertex at the position of y, R is the vertex curvature radius, K is the conic constant, and A to E are aspherical coefficients.

7. A cylindrical lens that extends in a first direction orthogonal to the optical axis direction of a light source and irradiates light from the light source onto an irradiation target surface spaced apart from the light source in the optical axis direction and a second direction orthogonal to the first direction, an exit surface, a first entrance surface provided on the opposite side of the irradiation target surface with respect to the optical axis of the light source, a second entrance surface provided on the opposite side of the first entrance surface with respect to the optical axis, and closer to the irradiation target surface than the first entrance surface so as to intersect the optical axis, and an entrance surface having a third entrance surface provided between the first entrance surface and the second entrance surface and guiding the light incident from the light source to the exit surface, a first reflecting surface that reflects the light incident from the first entrance surface to the exit surface, a second reflecting surface that reflects the light incident from the second entrance surface to the exit surface, including the third entrance surface is convex on the light source side and is formed as a curved surface that approaches the light source as it goes toward the irradiation target surface and intersects the optical axis, and is curved so as to be convex on the light source side in the optical axis direction, the vertex of the third entrance surface is located on the irradiation target surface side of the optical axis, a diffusing surface that connects the third entrance surface and the second entrance surface and diffuses the light incident from the light source, a cylindrical lens.

Images