JP2019086723A - Optical member and lighting unit - Google Patents

Abstract

To provide an optical member that can emit incident light in a desired direction and over a wide range.SOLUTION: A plate-like optical member 100 having translucency comprises: a first principal surface 101 and a second principal surface 102 arranged back to back to each other; and a first prism 120 provided in a first area 111 of the first principal surface 101. The first prism 120 has a plurality of first projection parts 121 respectively extending along a plurality of first reference lines L1 when the first principal surface 101 is viewed from the front face; each of the plurality of first reference lines L1 is convex from a reference point P different from the center of the first principal surface 101 toward a predetermined direction parallel to the first principal surface 101, and is axial symmetry with an axis passing through the reference point P and extending in the predetermined direction as a symmetry axis.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an optical member and a luminaire including the optical member.

  BACKGROUND Conventionally, a ceiling-embedded luminaire for a wall washer has been known which has an asymmetric light distribution characteristic so as to mainly illuminate a wall surface (see, for example, Patent Document 1). The illuminating device of patent document 1 is equipped with the optical member by which several prisms were provided in one main surface. The illumination device achieves asymmetric light distribution characteristics by causing the incident light to be emitted in one direction with respect to the optical axis of the light source.

JP, 2015-125825, A

  Downlights for wall washers are usually arranged side by side along the wall on a ceiling near the wall to be illuminated. At this time, a triangular light pattern called scallop is formed, and the appearance becomes worse.

  Therefore, an object of the present invention is to provide an optical member capable of emitting incident light in a desired direction and in a wide range, and a luminaire including the optical member.

  In order to achieve the above-mentioned object, an optical member concerning one mode of the present invention is a plate-like optical member which has translucency, and the 1st principal surface and the 2nd principal surface which face each other, and the said 1st A plurality of first prisms provided in a first region of the main surface, the first prism extending along each of a plurality of first reference lines when the first main surface is viewed from the front; And each of the plurality of first reference lines is convex in a predetermined direction parallel to the first main surface from a first reference point different from the center of the first main surface. And, the axis passing through the first reference point is axisymmetrical with an axis extending in the predetermined direction as an axis of symmetry.

  Moreover, the lighting fixture which concerns on 1 aspect of this invention is equipped with a light source and the said optical member which lets the light from the said light source pass.

  According to the present invention, it is possible to provide an optical member capable of emitting incident light in a desired direction and in a wide range, and a luminaire including the optical member.

It is a perspective view which shows the external appearance of the lighting fixture which concerns on embodiment. It is an exploded perspective view of a lighting fixture concerning an embodiment. It is a sectional view of a lighting fixture concerning an embodiment. It is a top view on the light emission side of the optical member concerning an embodiment. It is a top view of the light-incidence side of the optical member which concerns on embodiment. It is a sectional view of an optical member concerning an embodiment. It is sectional drawing which shows the optical path of the main light which the lighting fixture which concerns on embodiment radiate | emits. It is the principal part enlarged view which shows the principal part of the optical path of the main light which passes the prism by the side of the light emission surface of the optical member which concerns on embodiment. It is the principal part enlarged view which shows the principal part of the optical path of the main light which passes the prism by the side of the light-incidence surface of the optical member which concerns on embodiment. It is a figure which shows the pattern (shape of irradiation area | region) of the light formed in a wall surface, when two or more conventional lighting fixtures are arrange | positioned. It is a figure which shows the pattern (shape of irradiation area | region) of the light formed in a wall surface, when the lighting fixture which concerns on this Embodiment is multiply arranged.

  Hereinafter, an optical member and a luminaire according to an embodiment of the present invention will be described in detail with reference to the drawings. Each embodiment described below shows one specific example of the present invention. Therefore, numerical values, shapes, materials, components, arrangements and connection forms of components, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the components in the following embodiments, components that are not described in the independent claims indicating the highest concept of the present invention are described as optional components.

  Further, each drawing is a schematic view, and is not necessarily illustrated exactly. Therefore, for example, the scale and the like do not necessarily match in each figure. Further, in each of the drawings, substantially the same configuration is given the same reference numeral, and overlapping description will be omitted or simplified.

  Further, in the present specification, the term indicating the relationship between elements such as parallel or perpendicular, the term indicating the shape of an element such as circle or parabola, and the numerical range are not expressions expressing only a strict meaning. This expression is meant to include a substantially equivalent range, for example, a difference of about several percent.

  Moreover, in the present specification and drawings, the x-axis, the y-axis and the z-axis indicate three axes of the three-dimensional orthogonal coordinate system. Specifically, the direction parallel to the optical axis of the light source is the z-axis direction, and the negative direction of the z-axis is the light emission direction, that is, the light emission direction. Further, the light emission direction is the front, and the opposite direction of the light emission direction is the rear. The x-axis direction is the inclination direction of the light source and the optical member, and the y-axis direction is the horizontal direction.

Embodiment
[Overview]
First, the outline | summary of the lighting fixture which concerns on this Embodiment is demonstrated using FIGS.

  FIG. 1 is a perspective view showing the appearance of the lighting apparatus 1 according to the present embodiment.

  FIG. 2 is an exploded perspective view of the lighting apparatus 1 according to the present embodiment. In addition, in FIG. 2, the two attachment springs 50 with which the lighting fixture 1 is equipped are shown in the state fixed to the frame 20. As shown in FIG.

  FIG. 3 is a cross-sectional view of the lighting fixture 1 according to the present embodiment. Specifically, FIG. 3 shows a cross section including the optical axis J of the luminaire 1 and the tilt directions of the light source 30 and the optical member 100. Further, FIG. 3 also shows a ceiling plate 90 to which the lighting fixture 1 is attached.

  The luminaire 1 according to the present embodiment is, for example, an embedded luminaire such as a wall washer downlight which is embedded in a ceiling of a building or the like and illuminates the wall surface 93. As shown in FIG. 3, the lighting fixture 1 is partially embedded in the mounting hole 92. The mounting hole 92 is an example of a through hole provided in the ceiling surface 91 which is the lower surface of the ceiling plate 90. The ceiling surface 91 is an example of the installation surface of the lighting device 1.

  In the present embodiment, the lighting fixture 1 is attached to the attachment hole 92 such that the optical axis J of the light source 30 obliquely intersects the ceiling surface 91. The optical axis J obliquely intersects the vertical direction so as to extend toward the wall surface 93 to be illuminated by the lighting device 1. The angle between the vertical direction and the optical axis J is, for example, not less than 10 ° and not more than 40 °, for example, 30 °, but is not limited thereto.

  As shown in FIGS. 1 to 3, the lighting fixture 1 includes a fixture body 10, a frame 20, a light source 30, a reflecting member 40, a mounting spring 50, and an optical member 100. Below, the detail of each component with which the lighting fixture 1 is provided is demonstrated.

[Device body]
The instrument body 10 is a member in which the light source 30 is disposed. In the present embodiment, the tool body 10 is a mount on which the light source 30 is mounted. The instrument body 10 also functions as a heat sink for radiating heat generated by the light source 30. Therefore, the instrument body 10 is made of, for example, a material having high thermal conductivity such as a metal material. Specifically, the tool body 10 is made of aluminum die cast made of aluminum. Alternatively, the tool body 10 may be formed by sheet metal processing of an aluminum plate.

  As shown in FIGS. 2 and 3, the tool body 10 has a flat, bottomed cylindrical shape. Inside the bottom of the instrument body 10, there is a mounting surface 11 on which the light source 30 is mounted and fixed. A plurality of radiation fins may be provided on the outside of the bottom of the tool body 10.

  A plurality of through holes into which screws (not shown) for fixing the frame 20 and the reflection member 40 are inserted are provided at the bottom of the instrument body 10. The screw is inserted into the through hole from the rear side of the bottom of the device body 10 and screwed into the screw hole provided in each of the frame 20 and the reflecting member 40, whereby the frame 20 and the reflecting member in the device body 10 40 is fixed.

[Frame]
The frame 20 is a member for fixing the lighting fixture 1 to the ceiling plate 90. As shown in FIGS. 2 and 3, the frame 20 has an inner cylindrical portion 21, an outer cylindrical portion 22, an outer edge portion 23 and a weir 24.

  The inner cylindrical portion 21 is a cylindrical portion having the optical axis J as a central axis. As shown in FIG. 3, the reflecting member 40 and the optical member 100 are disposed inside the inner cylindrical portion 21.

  The outer cylindrical portion 22 is a truncated conical cylindrical portion having the optical axis J as a central axis. The outer cylindrical portion 22 is provided so as to surround the outer side surface of the inner cylindrical portion 21. The front end of the outer cylindrical portion 22 is connected to the front end of the inner cylindrical portion 21.

  The outer edge portion 23 is a portion provided so as to obliquely surround the outer cylindrical portion 22. The outer edge portion 23 has a shape obtained by obliquely cutting a truncated cone whose central axis is the vertical direction. The cut surface is inclined relative to the ceiling surface 91 at, for example, about half of the angle formed by the surface orthogonal to the optical axis J and the ceiling surface 91.

  The weir 24 is an annular portion extending outward from the front end of the outer edge portion 23. The inner cylinder portion 21 and the outer cylinder portion 22 partially project forward with respect to the collar 24. In the state where the lighting fixture 1 is inserted into the mounting hole 92 provided in the ceiling plate 90, the wedge 24 and the plurality of mounting springs 50 sandwich the ceiling plate 90 around the mounting hole 92, thereby making the ceiling plate 90 It is attached.

  As shown in FIG. 3, about half of each of the inner cylindrical portion 21 and the outer cylindrical portion 22 protrudes forward from the weir 24. For this reason, when the lighting fixture 1 is attached to the attachment hole 92, the part which protrudes to the front side from the weir 24 protrudes downward from the ceiling surface 91.

  The frame 20 can be formed of, for example, a metal material such as aluminum. The frame 20 is made of, for example, an aluminum die cast. Alternatively, the frame 20 may be formed by injection molding using a resin material such as polybutylene terephthalate (PBT).

  The frame 20 is fixed to the instrument body 10 by, for example, a fastening member such as a plurality of screws (not shown). In addition, the fixing method of the frame 20 and the instrument main body 10 is not specifically limited. For example, a locking portion such as a claw may be provided on one of the instrument body 10 and the frame 20, and a locked portion such as a hole to which the locking portion is locked may be provided on the other. The frame 20 may be fixed to the instrument body 10 by the locking portion being locked to the locked portion.

[light source]
The light source 30 is a light emitting module, and is a light source that radiates predetermined light radially. In the present embodiment, the light source 30 is a light emitting module having a light emitting diode (LED). The light source 30 is configured to emit, for example, white light.

  For example, the light source 30 is configured by a COB (Chip On Board) type LED. Specifically, as shown in FIGS. 2 and 3, the light source 30 seals a base 31, a plurality of LEDs 32 which are bare chips (LED chips) mounted on the base 31, and a plurality of LEDs 32. And a sealing member. The sealing member contains, for example, a phosphor. In the present embodiment, the sealing member collectively seals all the LEDs 32, but the present invention is not limited to this. The sealing member may be formed in a plurality of lines along the arrangement direction of the plurality of LEDs 32 arranged in a line.

  The light source 30 is mounted and fixed on the mounting surface 11 of the tool body 10. In the luminaire 1, the direction of the optical axis J of the light source 30 (the z-axis direction in each drawing) is a direction obliquely intersecting the vertical direction.

  The base 31 is a mounting substrate for mounting the plurality of LEDs 32 and is, for example, a ceramic substrate, a resin substrate, or a metal base substrate covered with an insulation. The base 31 is, for example, a plate having a flat surface having a rectangular shape in a plan view, and the bottom surface (rear surface) of the base 31 is mounted on the mounting surface 11 of the tool main body 10. The base 31 is formed with a pair of electrode terminals (a positive electrode terminal and a negative electrode terminal) for receiving, from the outside, DC power for causing the plurality of LEDs 32 (light sources 30) to emit light.

[Reflecting member]
As shown in FIG. 3, the reflecting member 40 has an end (a front end) on which the light is emitted from an end (a rear end) on the side (a positive side of the z axis) on which the light from the light source 30 is incident. It has a cylindrical shape configured such that the inner diameter gradually increases toward the end). The light from the light source 30 is reflected on the inner surface of the reflecting member 40.

  As shown in FIG. 2, a plurality of pairs of claws 41 for supporting the optical member 100 are provided on the outer side surface of the reflecting member 40. The pair of claws 41 are disposed to face each other at a predetermined distance. The protrusion 103 of the optical member 100 is inserted and locked between the pair of claws 41. In the present embodiment, the reflection member 40 includes three pairs of claws 41, but the number of claws 41 is not particularly limited.

  Further, a conductive member for supplying power to the light source 30 and a holding portion (not shown) for holding the conductive member are provided behind the reflective member 40. The holding portion is sandwiched and fixed between the reflection member 40 and the instrument body 10. The conductive member is formed of, for example, a conductive member such as copper, and is electrically connected to the electrode terminal of the base 31 of the light source 30.

  The reflecting member 40 is fixed to the instrument body 10 by, for example, a fastening member such as a plurality of screws (not shown). At this time, the rear end of the reflection member 40 may press the base 31 of the light source 30 toward the mounting surface 11. Thereby, the light source 30 is also fixed to the tool body 10 by fixing the reflecting member 40 to the tool body 10.

  In addition, the fixing method of the reflection member 40 and the instrument main body 10 is not specifically limited. For example, a locking portion such as a claw may be provided on one of the reflection member 40 and the instrument main body 10, and a locked portion such as a hole on which the locking portion is locked may be provided on the other. The reflecting member 40 may be fixed to the instrument body 10 by the locking portion being locked to the locked portion. In addition, the reflecting member 40 may be fixed to the frame 20.

  The reflective member 40 can be formed using, for example, a hard white resin material such as PBT. The reflecting member 40 may be provided with a metal film such as aluminum on the inner surface.

[Mounting spring]
The attachment spring 50 is used to attach the luminaire 1 to the attachment hole 92 provided in the ceiling. Specifically, the ceiling plate 90 is held between the mounting spring 50 and the hook 24 of the frame 20 using the restoring force of the mounting spring 50, whereby the lighting fixture 1 can be mounted.

  The mounting spring 50 is formed into a long thin plate shape by press processing or the like using a metal material such as iron. In the present embodiment, as shown in FIG. 1, the lighting fixture 1 includes two mounting springs 50, but the number and position of the mounting springs 50 are not limited thereto.

[Optical member]
The optical member 100 is a light transmitting plate-like optical member. As shown in FIG. 3, the optical member 100 has a first main surface 101 and a second main surface 102 facing each other.

  The first major surface 101 is a surface on the opposite side to the light source 30, and is a surface on the light emission side of light that is light from the light source 30 and passes through the optical member 100. The second major surface 102 is a surface on the light source 30 side, and is a surface on the side on which the light from the light source 30 is incident on the optical member 100. In the present embodiment, the optical member 100 is disposed such that the optical axis J passes through the centers of the first major surface 101 and the second major surface 102.

  The optical member 100 is formed in a predetermined shape so as to obtain desired light distribution characteristics. Specifically, as shown in FIG. 3, the optical member 100 includes the first prism 120 provided on the first major surface 101 and the first concavo-convex structure 130, and the second prism provided on the second major surface 102. 150 and the second uneven structure 140. The detailed shape of the optical member 100 will be described later.

  At least a portion of the optical member 100 protrudes from a mounting hole 92 provided in the ceiling surface 91. Specifically, most of the first prism 120 and the second uneven structure 140 of the optical member 100 are located below the ceiling surface 91. The first concavo-convex structure 130 and the second prism 150 are located in the mounting hole 92 and do not project downward from the ceiling surface 91.

  The optical member 100 is formed into a predetermined shape by a mold or the like using, for example, a transparent resin material such as acrylic (PMMA) or polycarbonate (PC) or a transparent material such as a glass material.

  Three protrusions 103 are provided on the outer periphery of the optical member 100. The optical member 100 is held by the reflective member 40 by the three projections 103 being engaged with the three pairs of claws 41 respectively.

[Detailed shape of optical member]
Then, the specific shape of the optical member 100 with which the lighting fixture 1 which concerns on this Embodiment is equipped is demonstrated using FIGS.

  FIG. 4 is a plan view of the light emission side of the optical member 100 according to the present embodiment. Specifically, FIG. 4 shows a shape of the first major surface 101 of the optical member 100 as viewed from the negative side of the z axis, that is, from the front.

  FIG. 5 is a plan view of the light incident side of the optical member 100 according to the present embodiment. Specifically, FIG. 5 shows the shape of the second major surface 102 of the optical member 100 as viewed from the front side from the positive side of the z axis, that is, the rear side.

  FIG. 6 is a cross-sectional view of the optical member 100 according to the present embodiment. Specifically, FIG. 6 shows a cross section taken along the line VI-VI in FIG. 4 and FIG. The cross section shown in FIG. 6 is a cross section including the optical axis J of the light source 30 and parallel to the tilt direction (x-axis direction) of the light source 30.

  In the present embodiment, each of the first major surface 101 and the second major surface 102 is a substantially circular surface having a plan view shape centered on the optical axis J. The first major surface 101 and the second major surface 102 have substantially the same size.

  As shown in FIGS. 4 and 6, the first major surface 101 includes a first region 111 and a third region 113. The first area 111 is an area including the optical axis J and is larger than the third area 113. As shown in FIG. 4, the first prism 120 is provided in the entire area of the first region 111. In other words, the area where the first prism 120 is provided is the first area 111.

  The first region 111 is, for example, a region within a circle of radius R centered on the reference point P in the first major surface 101. The reference point P is an example of a first reference point different from the center of the first major surface 101, and is located on the outer periphery of the first major surface 101 in the example shown in FIG. The radius R is longer than the radius r of a circle which is a plan view shape of the first major surface 101.

  The third area 113 is an area of the first major surface 101 excluding the first area 111. In the example shown in FIG. 4, the third region 113 has a crescent shape in a plan view. The first uneven structure 130 is provided in the entire area of the third region 113. In other words, the area where the first uneven structure 130 is provided is the third area 113.

  As shown in FIGS. 5 and 6, the second major surface 102 includes a second region 112 and a fourth region 114. The second area 112 is an area including the optical axis J and is larger than the fourth area 114. As shown in FIG. 5, the second uneven structure 140 is provided in the entire area of the second region 112. In other words, the area in which the second uneven structure 140 is provided is the second area 112. In the present embodiment, the second area 112 is an area opposite to the first area 111. The second region 112 has the same shape and size as the first region 111.

  The fourth region 114 is a region of the second major surface 102 excluding the second region 112. In the example shown in FIG. 5, the fourth region 114 has a crescent shape in a plan view. The second prism 150 is provided in the entire area of the fourth region 114. In other words, the area where the second prism 150 is provided is the fourth area 114. In the present embodiment, the fourth area 114 is an area opposite to the third area 113. The fourth area 114 has the same shape and size as the third area 113.

  In the present embodiment, on the surface of at least one of the first major surface 101 and the second major surface 102 of the optical member 100, minute asperities are provided. The micro-concavities and convexities are, for example, a plurality of projections and recesses randomly distributed and arranged at random sizes formed by embossing.

  The minute asperities are provided, for example, only in a region different from the first region 111 of the first major surface 101. Specifically, the minute unevenness is provided on the uneven surface of the first uneven structure 130 provided in the third region 113.

  The minute unevenness may be provided not only on the third region 113 but also on the entire surfaces of the first major surface 101 and the second major surface 102. Alternatively, the micro unevenness may be provided in at least one of the first area 111, the second area 112, the third area 113, and the fourth area 114.

  Further, in the present embodiment, the thickness of the optical member 100 is different. Specifically, as shown in FIG. 6, the plate thickness t1 between the first region 111 and the second region 112 is larger than the plate thickness t2 between the third region 113 and the fourth region 114. Since the thickness t1 is larger than the thickness t2, light Lc (see FIG. 7) described later can be efficiently emitted from the first major surface 101. Therefore, the amount of light emitted from the luminaire 1 can be increased.

[First prism]
The first prism 120 is located below the ceiling surface 91, as shown in FIG. The first prism 120 is provided on the light emission side of a portion apart from the wall surface 93 of the optical member 100. By refracting the light from the light source 30, the first prism 120 spreads out toward the wall surface 93 in the lateral direction (y-axis direction).

  As shown in FIG. 4, when the first major surface 101 is viewed from the front, the first prism 120 has a plurality of first convex portions 121 extending along the plurality of first reference lines L1. The plurality of first reference lines L1 are illustrated by broken lines in FIG. The first reference line L1 is, for example, a line connecting the tip (or the base) of the first convex portion 121.

  Each of the plurality of first reference lines L1 is convex in a predetermined direction from the reference point P, and is line symmetrical with an axis extending in the predetermined direction passing through the reference point P as a symmetry axis. Here, the predetermined direction is a direction parallel to the first major surface 101 and orthogonal to the optical axis J. Specifically, the predetermined direction is a direction connecting the reference point P and the center of the first major surface 101 (that is, the optical axis J). More specifically, the predetermined direction is the negative direction of the x axis. The predetermined direction coincides with the inclination direction of the optical member 100.

  The symmetry axis of line symmetry is a VI-VI line shown in FIG. That is, in the example shown in FIG. 4, each of the plurality of first reference lines L1 is convex in the upper direction (negative direction of the x-axis) in the drawing and is line symmetrical with the line VI-VI as a symmetry axis.

  Specifically, the plurality of first reference lines L1 are arcs of concentric circles having the reference point P as a center. The plurality of first reference lines L1 are provided at equal intervals. Each of the plurality of first reference lines L1 may be a parabola. At this time, the focal point of each parabola is located on the symmetry axis. For example, the focus may be the reference point P.

  In the present embodiment, as shown in FIG. 4, twelve first reference lines L1 are provided. Twelve first convex portions 121 are provided along the twelve first reference lines L1. Each of the twelve first protrusions 121 extends long along the corresponding first reference line L1.

  The shapes of the plurality of first protrusions 121 are the same in the cross section shown in FIG. The cross section shown in FIG. 6 is a cross section orthogonal to the first major surface 101 and including the axis of symmetry. As shown in FIG. 6, each of the plurality of first protrusions 121 has two side surfaces 122 and 123.

  The side surface 122 has a function of refracting the light from the light source 30 and emitting the light toward the wall surface 93. That is, the side surface 122 is a surface that performs the main function of the first prism 120, that is, a light distribution control surface. The side surface 122 is parallel to the ceiling surface 91 or intersects at an angle of 10 ° or less when the luminaire 1 is attached to the attachment hole 92. The crossing angle at this time may be 5 ° or less or 2 ° or less.

  The side surface 123 intersects the direction perpendicular to the ceiling surface 91 (that is, the vertical direction) at an angle parallel or less than 10 °. The crossing angle at this time may be 5 ° or less or 2 ° or less.

  As shown in FIG. 6, the side surface 122 and the side surface 123 are alternately and continuously connected. Thereby, a plurality of first convex portions 121 are provided side by side. The tips and proximal ends of the plurality of first protrusions 121 (that is, the connecting portion between the side surface 122 and the side surface 123) may be smooth or pointed.

[First uneven structure]
The first uneven structure 130 is located in the mounting hole 92 above the ceiling surface 91, as shown in FIG. The first concavo-convex structure 130 is provided on the light emission side of a portion close to the wall surface 93 of the optical member 100. By refracting the light from the light source 30, the first uneven structure 130 spreads out in the lateral direction (y-axis direction). The first uneven structure 130 also has a function of totally reflecting part of the light from the light source 30 and returning the light to the light source 30 side.

  The first concavo-convex structure 130 is a plurality of grooves extending along a predetermined direction when the first major surface 101 is viewed from the front as shown in FIG. 4. Specifically, the first uneven structure 130 is a plurality of parallel grooves extending along the x-axis. For example, a concave surface extending in the x-axis direction constitutes one groove. The grooves are repeatedly provided in the y-axis direction. Each of the plurality of grooves is, for example, a U-shaped groove, but may be a V-shaped groove. The plurality of grooves have the same shape and the same size in the yz cross section.

  The first uneven structure 130 may have a dimple structure instead of the plurality of grooves. Alternatively, the first uneven structure 130 may be composed of a plurality of randomly or regularly provided unevenness.

[Second uneven structure]
The second uneven structure 140 is located below the ceiling surface 91, as shown in FIG. The second concavo-convex structure 140 is provided on the light incident side of a portion apart from the wall surface 93 of the optical member 100. The second uneven structure 140 expands the light from the light source 30 in the lateral direction (y-axis direction) by refracting the light.

  The second concavo-convex structure 140 is a plurality of grooves extending along a predetermined direction when the second major surface 102 is viewed from the front as shown in FIG. 5. Specifically, the second uneven structure 140 is a plurality of parallel grooves extending along the x-axis. For example, a concave surface extending in the x-axis direction constitutes one groove. The grooves are repeatedly provided in the y-axis direction. Each of the plurality of grooves is, for example, a U-shaped groove, but may be a V-shaped groove. The plurality of grooves have the same shape and the same size in the yz cross section. The plurality of grooves constituting the second concavo-convex structure 140 and the plurality of grooves constituting the first concavo-convex structure 130 may have the same shape and the same size in the yz cross section.

  The second uneven structure 140 may have a dimple structure instead of the plurality of grooves. Alternatively, the second uneven structure 140 may be composed of a plurality of randomly or regularly provided unevenness.

[Second prism]
The second prism 150 is located in the mounting hole 92 above the ceiling surface 91, as shown in FIG. The second prism 150 is provided on the light incident side of a portion close to the wall surface 93 of the optical member 100. By refracting the light from the light source 30, the second prism 150 spreads out in the direction not blocked by the frame 20 and in the lateral direction (y-axis direction).

  As shown in FIG. 5, when the second major surface 102 is viewed from the front, the second prism 150 has a plurality of second convex portions 151 extending along each of the plurality of second reference lines L2. In the present embodiment, the second prism 150 further includes a plurality of third convex portions 155 extending along each of the plurality of third reference lines L3. The plurality of second reference lines L2 and the plurality of third reference lines L3 are respectively illustrated by broken lines in FIG. As shown in FIG. 5, the plurality of third convex portions 155 are provided on the outer peripheral side of the second major surface 102 than the plurality of second convex portions 151.

  Each of the plurality of second reference lines L2 is convex from the reference point Q toward a predetermined direction (the negative direction of the x-axis), and is line symmetrical with the line VI-VI as an axis of symmetry. Specifically, the plurality of second reference lines L2 are circular arcs of concentric circles centered on the reference point Q. The plurality of second reference lines L2 are provided at equal intervals. Each of the plurality of second reference lines L2 may be a parabola. At this time, the focal point of each parabola is located on the symmetry axis. For example, the focus may be the reference point Q.

  The reference point Q is an example of a second reference point. In the present embodiment, the reference point Q is a point different from the center of the second major surface 102, and is located on the outer periphery of the second major surface 102 in the example shown in FIG. Specifically, the reference point Q is located just opposite to the reference point P. In other words, a straight line connecting the reference point P and the reference point Q coincides with the thickness direction of the optical member 100 and is parallel to the optical axis J.

  In the present embodiment, as shown in FIG. 5, three second reference lines L2 are provided. Three second convex portions 151 are provided along the three second reference lines L2. Each of the three second protrusions 151 extends long along the corresponding second reference line L2.

  The shapes of the plurality of second convex portions 151 are the same in the cross section shown in FIG. As shown in FIG. 6, each of the plurality of second protrusions 151 has two side surfaces 152 and 153.

  The side surface 152 is an example of the first side surface, and has a function of refracting the light from the light source 30 and emitting the light toward the wall surface 93. That is, the side surface 152 is a surface that performs the main function of the second prism 150, that is, a light distribution control surface. The side surface 152 is parallel to the ceiling surface 91 or intersects at an angle of 10 ° or less when the luminaire 1 is attached to the attachment hole 92. The crossing angle at this time may be 5 ° or less or 2 ° or less.

  The side surface 153 is an example of a second side surface whose inclination with respect to the ceiling surface 91 is larger than the side surface 152. In the present embodiment, the side surface 153 is not a light distribution control surface, and it is preferable that light does not enter as much as possible.

  The side surface 153 obliquely intersects the side surface 152. The crossing angle at this time is, for example, 50 ° or more and 90 ° or less. The inclination angle of the side surface 153 with respect to the optical axis J is, for example, 0 ° or more and 5 ° or less. The inclination angle of the side surface 152 with respect to the optical axis J is, for example, 50 ° or more and 80 ° or less. These inclination angles and crossing angles are merely examples, and are not limited to the illustrated range.

  As shown in FIG. 6, the side surface 152 and the side surface 153 are alternately and continuously connected. Thereby, a plurality of second convex portions 151 are provided side by side. The distal end and the proximal end of the plurality of second protrusions 151 (that is, the connection portion between the side surface 152 and the side surface 153) may be smooth or pointed.

  Each of the plurality of third reference lines L3 is convex from the third reference point in a predetermined direction (negative direction of the x-axis), and is line symmetrical with the line VI-VI as an axis of symmetry. Specifically, the plurality of third reference lines L3 are arcs of concentric circles centered on the third reference point. The plurality of third reference lines L3 are provided at equal intervals. Each of the plurality of third reference lines L3 may be a parabola. At this time, the focal point of each parabola is the third reference point, and is located on the symmetry axis.

  The third reference point is, for example, the same as the second reference point, and is the reference point Q. As a result, the second convex portion 151 and the third convex portion 155 are connected smoothly, and the generation of the light unevenness can be suppressed. Alternatively, the third reference point may be located at a position farther from the center of the second major surface 102 than the second reference point.

  In the present embodiment, as shown in FIG. 5, three third reference lines L3 are provided. Three third convex portions 155 are provided along the three third reference lines L3. Each of the three third convex portions 155 extends long along the corresponding third reference line L3.

  The shapes of the plurality of third convex portions 155 are the same in the cross section shown in FIG. At this time, in the cross section shown in FIG. 6, the shapes of the plurality of third convex portions 155 are different from the shapes of the plurality of second convex portions 151. As shown in FIG. 6, each of the plurality of third protrusions 155 has two side surfaces 156 and 157.

  The side surface 156 is an example of the third side surface, and the inclination with respect to the ceiling surface 91 is larger than the side surface 152 of the second convex portion 151. In the present embodiment, the side surface 156 is not a light distribution control surface, and it is preferable that light does not enter as much as possible. In the cross section shown in FIG. 6, the length of the line segment representing the side surface 156 is shorter than the length of the line segment representing the side surface 152. That is, the side surface 156 is smaller than the side surface 152 in the cross section.

  The side surface 157 is an example of a fourth side surface whose inclination with respect to the ceiling surface 91 is larger than the side surface 156. In the present embodiment, the side surface 157 is a light distribution control surface that refracts the light passing through the side surface 157 in the direction in which the first concavo-convex structure 130 facilitates total reflection.

  The side surface 157 obliquely intersects the side surface 156. The crossing angle at this time is, for example, 35 ° or more and 75 ° or less. In addition, the inclination angle with respect to the optical axis J of the side surface 157 is 0 degree or more and 25 degrees or less, for example. The inclination angle of the side surface 156 with respect to the optical axis J is, for example, 35 ° or more and 50 or less. These inclination angles and crossing angles are merely examples, and are not limited to the illustrated range.

  As shown in FIG. 6, the side surface 156 and the side surface 157 are alternately connected in series. Thereby, the plurality of third convex portions 155 are provided side by side. The distal end and the proximal end of the plurality of third convex portions 155 (that is, the connecting portion between the side surface 156 and the side surface 157) may be smooth or pointed.

[Optical path]
Subsequently, the main path (light path) of light emitted by the lighting apparatus 1 will be described with reference to FIGS. 7 to 9.

  FIG. 7 is a cross-sectional view showing optical paths of main lights La to Ld emitted from the lighting fixture 1 according to the present embodiment. Specifically, FIG. 7 shows a cross section including the optical axis J and the axis of symmetry (VI-VI line), as in FIGS. 3 and 6.

  FIG. 8 is an enlarged view of an essential part of an optical path of main light passing through the first prism 120 on the light emitting surface side of the optical member 100 according to the present embodiment. Specifically, FIG. 8 is an enlarged sectional view showing a region VIII surrounded by an alternate long and short dash line in FIG.

  FIG. 9 is an enlarged view of an essential part showing an optical path of main light passing through the second prism 150 on the light incident surface side of the optical member 100 according to the present embodiment. Specifically, FIG. 9 is an enlarged sectional view showing a region IX surrounded by an alternate long and short dash line in FIG.

  The light La is refracted when entering the second uneven structure 140 provided on the second major surface 102 as shown in FIGS. 7 and 8, and further, the first prism provided on the first major surface 101. It is refracted when emitted from 120. Specifically, the light La is refracted toward the wall surface 93 at the side surface 122 of the first convex portion 121 of the first prism 120.

  In addition, the light La is expanded in the y-axis direction (lateral direction) by the concave surfaces of the plurality of grooves constituting the second concavo-convex structure 140. Furthermore, since the plurality of first convex portions 121 constituting the first prism 120 are axisymmetrical with the line VI-VI (parallel to the x axis) as the symmetry axis and are convex in the negative direction of the x axis, The side surface 122 is a curved surface. Therefore, the light La is further spread in the y-axis direction (lateral direction) when being refracted by the curved surface. Therefore, the light La travels toward the wall 93 as light that has spread more laterally.

  The light Lb is refracted when entering the second convex portion 151 of the second prism 150 provided on the second main surface 102 as shown in FIGS. 7 and 9, and is further provided on the first main surface 101. When the light is emitted from the first uneven structure 130, it is refracted. Specifically, the light Lb is refracted toward the vertically downward direction on the side surface 152 of the second convex portion 151. As a result, it is possible to suppress that light is blocked by the frame 20 and the like, so the amount of light emitted from the lighting fixture 1 can be increased. Moreover, since the amount of light blocked by the frame 20 can be reduced, the occurrence of uneven illuminance can be further suppressed.

  In addition, since the plurality of second convex portions 151 included in the second prism 150 are line symmetrical with respect to the VI-VI line (parallel to the x axis) as a symmetry axis and are convex in the negative direction of the x axis, The side surface 152 is a curved surface. Therefore, the light Lb is spread in the y-axis direction (lateral direction) when being refracted by the curved surface. Further, the light Lb is further spread in the y-axis direction (lateral direction) by the concave surfaces of the plurality of grooves constituting the first concavo-convex structure 130. Therefore, the light Lb becomes light which has spread more laterally, and travels downward of the wall surface 93 without being blocked by the frame 20.

  When the second convex portion 151 is not provided, the light Lb is blocked by the frame 20 and is not emitted toward the wall surface 93. That is, it causes uneven illuminance (uneven illuminance) due to the frame 20. According to the present embodiment, the amount of light blocked by the frame 20 can be reduced, so that the occurrence of uneven illuminance can be suppressed. That is, wall surface irradiation with high uniformity is realized. The degree of uniformity is represented, for example, by the ratio of the minimum value to the maximum value of the illuminance within the irradiation range, or the ratio of the minimum value to the average value.

  As shown in FIGS. 7 and 8, the light Lc is incident on the edge portion of the optical member 100, is emitted as it is, and is reflected by the inner cylindrical portion 21 of the frame 20. For this reason, the light Lc is incident from the end face of the optical member 100 without passing through the second major surface 102, and is emitted from the side surface 123 of the first convex portion 121 of the first prism 120.

  At this time, since the side surface 123 intersects with the vertical direction in parallel or at an intersection angle of 10 ° or less, the light Lc is likely to be incident substantially perpendicularly to the side surface 123. Therefore, the light Lc is emitted as it is without refraction at the side surface 123. Thereby, as shown in FIG. 7, the light Lc travels toward the wall surface 93 and in a direction closer to the ceiling surface 91. Therefore, according to the lighting fixture 1 which concerns on this Embodiment, the connection part (corner) of the ceiling surface 91 and the wall surface 93 can also be illuminated.

  In the present embodiment, the thickness t2 of the optical member 100 between the first area 111 and the second area 112 is large. For this reason, the light quantity which injects from the end surface of the optical member 100 increases, and the radiation | emission amount of the light from the side surface 123 increases.

  The light Ld is refracted when entering the third convex portion 155 of the second prism 150 provided on the second main surface 102 as shown in FIGS. 7 and 9, and is further provided on the first main surface 101. The light is totally reflected by the first uneven structure 130. Specifically, the light Ld is incident on the side surface 157 of the third convex portion 155 and is refracted by the side surface 157 to be light closer to the horizontal direction.

  Therefore, since the light Ld is shallowly incident on the first major surface 101, total reflection easily occurs in the first concavo-convex structure 130. The light totally reflected by the first uneven structure 130 travels while being totally reflected in the optical member 100. The light Ld is attenuated when repeating total reflection or travels back to the light source 30 side.

  When the third convex portion 155 is not provided, the light Ld is blocked by the frame 20 and is not emitted toward the wall surface 93. That is, it becomes the cause of the illumination nonuniformity (illuminance is uneven) by the frame 20.

  On the other hand, according to the present embodiment, the amount of light blocked by the frame 20 can be reduced, so that the occurrence of uneven illuminance can be further suppressed. That is, wall surface irradiation with high uniformity is realized.

[Effect, etc.]
As described above, the optical member 100 according to the present embodiment is a plate-like optical member having translucency, and the first main surface 101 and the second main surface 102 facing each other, and the first main And a first prism 120 provided in a first area 111 of the surface 101. The first prism 120 has a plurality of first convex portions 121 extending along each of the plurality of first reference lines L1 when the first major surface 101 is viewed from the front. Each of the plurality of first reference lines L1 is convex from a reference point P different from the center of the first major surface 101 toward a predetermined direction parallel to the first major surface 101, and passes through the reference point P. The axis extending in the predetermined direction is axisymmetrical with the axis of symmetry as the axis of symmetry.

  As a result, it is possible to increase the amount of light emitted in a plane orthogonal to the first major surface 101 and close to a predetermined direction (negative direction of the x-axis) in the plane including the symmetry axis. For this reason, when the first main surface 101 is installed obliquely to the wall surface 93, the light intensity of the light irradiated to the wall surface 93 can be increased.

  Furthermore, the plurality of first convex portions 121 constituting the first prism 120 are provided such that the shape in plan view thereof is convex in the negative direction of the x-axis. As a result, the optical member 100 can emit light not only in the negative direction of the x-axis but also in the y-axis direction (that is, the lateral direction). Therefore, when the first principal surface 101 is installed obliquely to the wall surface 93, the luminaire 1 including the optical member 100 can illuminate the range expanded in the lateral direction of the wall surface 93.

  As described above, according to the optical member 100 according to the present embodiment, incident light can be emitted in a desired direction and in a wide range.

  Further, for example, the optical member 100 further includes a second uneven structure 140 provided in the second region 112 of the second main surface 102 opposite to the first region 111.

  Thereby, the second uneven structure 140 diffuses the light, so that the light can be emitted in a wider range.

  Also, for example, the optical member 100 further includes a second prism provided in the fourth region 114 of the second major surface 102 opposite to the third region 113 different from the first region 111 of the first major surface 101. 150 is provided. The second prism 150 includes a plurality of second protrusions 151 extending along each of the plurality of second reference lines L2 when the second major surface 102 is viewed from the front. Each of the plurality of second reference lines L2 is convex in a predetermined direction from the second reference point, and is line symmetrical with the axis as a symmetry axis.

  Thereby, similarly to the first prism 120, it is possible to increase the light amount of the light irradiated to the wall surface 93, and it is possible to illuminate the range expanded in the lateral direction. Moreover, since it can suppress that light is interrupted | blocked by the frame 20 of the lighting fixture 1, the ceiling board 90, etc., generation | occurrence | production of illumination intensity nonuniformity can be suppressed.

  Also, for example, the second prism 150 further includes a plurality of third convex portions 155 extending along each of the plurality of third reference lines L3 when the second major surface 102 is viewed from the front. Each of the plurality of third reference lines L3 is convex in a predetermined direction from the third reference point, and is line symmetrical with the above axis as a symmetry axis. In the cross section including the axis orthogonal to the second main surface 102, the shapes of the plurality of second protrusions 151 are the same as each other, and the shapes of the plurality of third protrusions 155 are the same as each other, The shape is different from the shape of the second convex portion 151.

  As a result, the amount of light blocked by the frame 20 of the lighting fixture 1 and the ceiling plate 90 can be further reduced, so that the occurrence of uneven illuminance can be further suppressed.

  Also, for example, the optical member 100 further includes the first uneven structure 130 provided in the third region 113.

  Thereby, since the first uneven structure 130 diffuses light, light can be emitted in a wider range.

  Also, for example, the first uneven structure 130 or the second uneven structure 140 is a plurality of grooves each extending in a predetermined direction.

  Thus, light can be efficiently diffused in the lateral direction corresponding to the direction in which the plurality of grooves are arranged.

  In addition, for example, on the surface of at least one of the first major surface 101 and the second major surface 102, fine asperities are provided.

  Thereby, light can be scattered by the minute unevenness, so that the illuminance unevenness can be suppressed while suppressing the glare.

  In addition, for example, the minute unevenness is provided only in a region (second region 112) different from the first region 111 of the first major surface 101.

  Thus, by setting only the second region 112 as the region in which the minute unevenness is provided, the amount of light scattering due to the minute unevenness can be suppressed. Therefore, it is possible to suppress uneven illuminance while suppressing a decrease in the amount of light extracted from the optical member 100.

  Also, for example, each of the plurality of first reference lines L1 is a parabola or an arc of each of concentric circles centered on the reference point P.

  Thereby, since the planar view shape of the plurality of first convex portions 121 is smoothly bent along the first reference line L1, not only light emitted in a predetermined direction but also a direction orthogonal to the predetermined direction (ie, Light can be emitted efficiently in the lateral direction.

  Also, for example, the reference point P is located on the outer periphery of the first major surface 101.

  Thereby, it is possible to realize well-balanced emission of light toward the wall surface 93 and diffusion of light in the lateral direction.

  Also, for example, the lighting fixture 1 according to the present embodiment includes the light source 30 and the optical member 100 that allows the light from the light source 30 to pass.

  Thereby, since the lighting fixture 1 includes the optical member 100, when the first main surface 101 is installed obliquely to the wall surface 93, the light amount of the light irradiated to the wall surface 93 is increased while the light intensity of the wall surface 93 is increased. It can illuminate a wide range.

  FIG. 10 is a view showing the pattern of light (the shape of the irradiation area) formed on the wall surface 93 when a plurality of conventional lighting fixtures 1x are arranged. FIG. 11 is a view showing the pattern of light (the shape of the irradiation area) formed on the wall surface 93 when a plurality of lighting devices 1 according to the present embodiment are arranged. In FIG. 10 and FIG. 11, the areas not irradiated with the light from the plurality of lighting fixtures 1 x or 1 are hatched with dots.

  As shown in FIG. 10, in the conventional luminaire 1x, since the spread of light in the lateral direction is not sufficient, a triangular light pattern (so-called scallop) is formed below the luminaire 1x.

  On the other hand, according to the luminaire 1 according to the present embodiment, the light can be sufficiently spread in the lateral direction by the optical member 100, so the wall surface 93 can be illuminated with uniform illuminance. Thus, according to the luminaire 1 according to the present embodiment, high uniformity can be realized.

  By arranging the conventional lighting fixture 1x apart from the wall surface 93, it is also possible to irradiate the wall surface 93 in a state in which the light is spread in the lateral direction. However, in the conventional lighting fixture 1x, less light is emitted toward the connecting portion between the wall surface 93 and the ceiling surface 91 (that is, the corner of the ceiling). Therefore, even if the luminaire 1x is disposed apart from the wall surface 93, a large scallop is formed above the wall surface 93.

  Therefore, in order to suppress the formation of scallops, it is necessary to shorten the distance between adjacent lighting fixtures 1x and install the lighting fixtures 1x. As a result, the number of the lighting fixtures 1x increases, the installation work becomes complicated, and the cost also increases.

  On the other hand, according to the lighting fixture 1 according to the present embodiment, light is emitted toward the corner of the ceiling, so that the upper side of the wall surface 93 can be widely illuminated. Thereby, the wall surface 93 can be illuminated with a small number while suppressing formation of scallops.

  Also, for example, the optical member 100 is disposed such that the optical axis J of the light source 30 passes through the centers of the first major surface 101 and the second major surface 102. The second major surface 102 is a surface on the light source 30 side.

  As a result, the first prism 120 is provided on the light emitting surface side of the light source 30, so that light can be efficiently refracted. Therefore, it is possible to illuminate a wide range of the wall surface 93 while increasing the amount of light to the wall surface 93.

  Further, for example, the lighting fixture 1 is partially embedded in the mounting hole 92 so that at least a part of the first prism 120 of the optical member 100 protrudes from the mounting hole 92 provided in the ceiling surface 91. ing. The optical axis J of the light source 30 obliquely intersects the ceiling surface 91.

  Thus, the light can be suppressed from being blocked by the ceiling plate 90, so that the amount of light emitted to the wall surface 93 can be increased.

  In addition, for example, each of the plurality of first convex portions 121 has a side surface 123 which intersects with the direction orthogonal to the ceiling surface 91 at an angle parallel or at 10 ° or less.

  As a result, light which is reflected by the frame 20 of the lighting device 1 and travels substantially parallel to the ceiling surface 91 can be emitted from the side surface 122. Therefore, the amount of light emitted from the lighting device 1 is increased. Can. Moreover, the connection part of the ceiling surface 91 and the wall surface 93, ie, the corner of a ceiling, can be illuminated.

  Also, for example, the optical member 100 is disposed such that the optical axis J of the light source 30 passes through the centers of the first major surface 101 and the second major surface 102. The second major surface 102 is a surface on the light source 30 side. The plurality of third convex portions 155 are provided on the outer peripheral side of the second major surface 102 than the plurality of second convex portions 151. Each of the plurality of second protrusions 151 has a side surface 152 and a side surface 153 whose inclination with respect to the ceiling surface 91 is larger than the side surface 152. Each of the plurality of third convex portions 155 has a side surface 156 whose inclination with respect to the ceiling surface 91 is larger than the side surface 152 and a side surface 157 whose inclination with respect to the ceiling surface 91 is larger than the side surface 156.

  As a result, the amount of light blocked by the frame 20 of the lighting fixture 1 and the ceiling plate 90 can be further reduced, so that the occurrence of uneven illuminance can be further suppressed.

(Others)
As mentioned above, although the optical member and lighting fixture which concern on this invention were demonstrated based on said embodiment, this invention is not limited to said embodiment.

  For example, the optical member 100 may not include at least one of the first uneven structure 130, the second uneven structure 140, and the second prism 150. For example, the optical member 100 may include only the first prism 120. At this time, the second major surface 102 on the light source 30 side may be a flat surface. The first prism 120 may be provided on the entire surface of the first major surface 101. The first major surface 101 may be a surface on the light source 30 side. That is, the first prism 120 may be provided on the light source 30 side, and the main surface on the opposite side of the light source 30 may be a flat surface.

  Further, for example, the optical member 100 may include the first prism 120 and the second uneven structure 140, and may not include the second prism 150 and the first uneven structure 130. Specifically, the third region 113 of the first major surface 101 may be a flat surface, and the fourth region 114 of the second major surface 102 may be a flat surface.

  Also, for example, the second prism 150 may not include the plurality of third convex portions 155, and may include only the plurality of second convex portions 151. At this time, the plurality of second convex portions 151 may be provided in the entire area of the fourth region 114. Alternatively, flat surfaces may be provided instead of the plurality of third convex portions 155.

  Also, for example, the plurality of first reference lines L1 may not be concentric circles, and may be along a plurality of arcs with different centers. Alternatively, at least one of the plurality of first reference lines L1 may be an arc, and at least one other may be a parabola. The plurality of first reference lines L1 may be elliptical arcs. The same applies to the plurality of second reference lines L2 and the plurality of third reference lines L3.

  Further, for example, the side surfaces of the plurality of first protrusions 121, the plurality of second protrusions 151, and the plurality of third protrusions 155 may not be flat, and may be curved.

  For example, the reference point P, which is an example of the first reference point, may be provided not on the outer periphery of the first major surface 101 but on the outer side of the first major surface 101. As the reference point P is separated from the first major surface 101, the plurality of first reference lines L1 will be closer to a straight line along the y-axis. For this reason, the emission of light in the direction of the wall is dominant rather than the spread of light in the lateral direction. The reference point P may be located in the first major surface 101 in plan view.

  Further, for example, in the above embodiment, although the example in which the light source 30 is a COB type LED module has been described, the present invention is not limited to this. For example, the light source 30 may include an SMD (Surface Mount Device) type LED as the LED 32. Alternatively, the light source 30 may include another solid light emitting element such as an organic EL (Electro Luminescence) element or a laser element instead of the LED 32.

  Also, for example, the lighting fixture 1 may not be an embedded lighting fixture such as a downlight, but may be a spotlight.

  In addition, the present invention can be realized by arbitrarily combining components and functions in each embodiment without departing from the scope of the present invention or embodiments obtained by applying various modifications that those skilled in the art may think to each embodiment. The form is also included in the present invention.

1 luminaire 30 light source 91 ceiling surface (installation surface)
92 Mounting hole (through hole)
100 optical member 101 first main surface 102 second main surface 111 first region 112 second region 113 third region 114 fourth region 120 first prism 121 first convex portion 122, 123 side surface 130 first uneven structure 140 second Concavo-convex structure 150 second prism 151 second convex portion 152 side surface (first side surface)
153 side (second side)
155 3rd convex part 156 side (3rd side)
157 Side (fourth side)
J Optical axis L1 First reference line L2 Second reference line L3 Third reference line P Reference point (first reference point)
Q reference point (second reference point, third reference point)

Claims (15)

It is a plate-like optical member having translucency,
First and second main surfaces facing each other;
And a first prism provided in a first region of the first main surface,
The first prism has a plurality of first convex portions extending along each of a plurality of first reference lines when the first main surface is viewed from the front,
Each of the plurality of first reference lines is convex in a predetermined direction parallel to the first main surface from a first reference point different from the center of the first main surface, and the first reference An optical member, which passes through a point and is axisymmetric with an axis extending in the predetermined direction as a symmetry axis. further,
The optical member according to claim 1, comprising a concavo-convex structure provided in a second area of the second main surface opposite to the first area. further,
A second prism provided in a fourth region of the second main surface opposite to a third region different from the first region of the first main surface,
The second prism has a plurality of second convex portions extending along each of a plurality of second reference lines when the second main surface is viewed from the front,
The optical member according to claim 1, wherein each of the plurality of second reference lines is convex from the second reference point toward the predetermined direction, and is line symmetrical with the axis as a symmetry axis. The second prism further has a plurality of third convex portions extending along each of a plurality of third reference lines when the second main surface is viewed from the front,
Each of the plurality of third reference lines is convex from the third reference point toward the predetermined direction, and is line symmetrical with the axis as a symmetry axis,
In a cross section orthogonal to the second main surface and including the axis,
The shapes of the plurality of second convex portions are the same as one another,
The optical member according to claim 3, wherein the shapes of the plurality of third convex portions are the same as one another and different from the shapes of the plurality of second convex portions. further,
The optical member according to claim 3, comprising a concavo-convex structure provided in the third region. The optical member according to any one of claims 2 to 5, wherein the concavo-convex structure is a plurality of grooves each extending in the predetermined direction. The optical member according to any one of claims 1 to 6, wherein fine asperities are provided on at least one surface of the first main surface and the second main surface. The optical member according to claim 7, wherein the minute unevenness is provided only in a region different from the first region of the first main surface. The optical member according to any one of claims 1 to 8, wherein each of the plurality of first reference lines is a parabola or an arc of each concentric circle centered on the first reference point. The optical member according to claim 9, wherein the first reference point is located on the outer periphery of the first main surface or the outer side of the first main surface. Light source,
The optical member according to any one of claims 1 to 10, which transmits light from the light source. The optical member is disposed such that an optical axis of the light source passes through a center of each of the first main surface and the second main surface,
The lighting fixture according to claim 11, wherein the second main surface is a surface on the light source side. The luminaire is partially embedded in the through hole so that at least a part of the first prism of the optical member protrudes from the through hole provided in a predetermined installation surface,
The lighting fixture according to claim 12, wherein an optical axis of the light source obliquely intersects the installation surface. The lighting fixture according to claim 13, wherein each of the plurality of first protrusions has a side surface that is parallel or intersects at an angle of 10 ° or less with respect to a direction orthogonal to the installation surface. Light source,
And the optical member according to claim 4.
The optical member is disposed such that an optical axis of the light source passes through a center of each of the first main surface and the second main surface,
The second main surface is a surface on the light source side,
The plurality of third convex portions are provided on the outer peripheral side of the second main surface than the plurality of second convex portions,
The plurality of second convex portions are respectively
The first side,
A second side surface having a slope relative to the installation surface greater than the first side surface;
The plurality of third convex portions are respectively
A third side surface having a slope relative to the installation surface that is greater than the first side surface;
4. A luminaire, comprising: a fourth side whose inclination with respect to the installation surface is greater than the third side.

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