JP7001993B2 - Optical members and lighting equipment - Google Patents

Description

The present invention relates to an optical member and a lighting fixture provided with the optical member.

Conventionally, a ceiling-embedded lighting fixture for a wall washer having an asymmetric light distribution characteristic so as to mainly illuminate a wall surface is known (see, for example, Patent Document 1). The lighting device described in Patent Document 1 includes an optical member provided with a plurality of prisms on one main surface. The illuminating device realizes an asymmetric light distribution characteristic by emitting the incident light in one direction with respect to the optical axis of the light source by a plurality of prisms.

Japanese Unexamined Patent Publication No. 2015-125825

A plurality of downlights for a wall washer are usually arranged side by side along the wall surface on the ceiling near the wall surface to be illuminated. At this time, a triangular light pattern called a scallop is formed, which makes the appearance 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 lighting fixture provided with the optical member.

In order to achieve the above object, the optical member according to one aspect of the present invention is a plate-shaped optical member having translucency, and has a first main surface and a second main surface facing each other and the first main surface. The first prism is provided with a first prism provided in the first region of the main surface, and the first prism extends along each of the plurality of first reference lines when the first main surface is viewed from the front. Each of the plurality of first reference lines having one convex portion is convex from a first reference point different from the center of the first main surface toward a predetermined direction parallel to the first main surface. Moreover, the axis passing through the first reference point and extending in the predetermined direction is line symmetry as the axis of symmetry.

Further, the luminaire according to one aspect of the present invention includes a light source and the optical member that allows light from the light source to pass through.

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

It is a perspective view which shows the appearance of the lighting fixture which concerns on embodiment. It is an exploded perspective view of the lighting equipment which concerns on embodiment. It is sectional drawing of the lighting equipment which concerns on embodiment. It is a top view of the light emission side of the optical member which concerns on embodiment. It is a top view of the light incident side of the optical member which concerns on embodiment. It is sectional drawing of the optical member which concerns on embodiment. It is sectional drawing which shows the optical path of the main light emitted by the luminaire which concerns on embodiment. It is an enlarged view of the main part which shows the main part of the optical path of the main light passing through the prism on the light emission surface side of the optical member which concerns on embodiment. It is an enlarged view of the main part which shows the main part of the optical path of the main light passing through the prism on the light incident surface side of the optical member which concerns on embodiment. It is a figure which shows the pattern of light (the shape of an irradiation area) formed on a wall surface when a plurality of conventional lighting fixtures are arranged. It is a figure which shows the pattern (the shape of the irradiation area) of the light formed on the wall surface when a plurality of lighting fixtures which concerns on this embodiment are arranged.

Hereinafter, the optical member and the lighting fixture according to the embodiment of the present invention will be described in detail with reference to the drawings. In addition, all of the embodiments described below show a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement and connection forms of components, steps, order of steps, etc. shown in the following embodiments are examples, and are not intended to limit the present invention. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept of the present invention will be described as arbitrary components.

Further, each figure is a schematic view and is not necessarily exactly illustrated. Therefore, for example, the scales and the like do not always match in each figure. Further, in each figure, substantially the same configuration is designated by the same reference numeral, and duplicate description will be omitted or simplified.

Further, in the present specification, terms indicating relationships between elements such as parallel or vertical, terms indicating the shape of elements such as circles or parabolas, and numerical ranges are not expressions expressing only strict meanings. , Is an expression meaning that a substantially equivalent range, for example, a difference of about several percent is included.

Further, in the present specification and the drawings, the x-axis, the y-axis, and the z-axis indicate the three axes of the three-dimensional Cartesian 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 direction in which light is emitted, that is, the light emission direction. Further, the light emitting direction is the front, and the opposite direction of the light emitting direction is the rear. The x-axis direction is the tilt direction of the light source and the optical member, and the y-axis direction is the horizontal direction.

(Embodiment)
[Overview]
First, the outline of the lighting fixture according to the present embodiment will be described with reference to FIGS. 1 to 3.

FIG. 1 is a perspective view showing an appearance showing the lighting fixture 1 according to the present embodiment.

FIG. 2 is an exploded perspective view of the lighting fixture 1 according to the present embodiment. In addition, in FIG. 2, the two mounting springs 50 included in the luminaire 1 are shown in a state of being fixed to the frame body 20.

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 including the tilt direction 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 lighting fixture 1 according to the present embodiment is, for example, an embedded lighting fixture such as a wall washer downlight that is embedded and arranged in the ceiling of a building and illuminates the wall surface 93. As shown in FIG. 3, the luminaire 1 is partially embedded and arranged 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 an installation surface of the lighting fixture 1.

In the present embodiment, the luminaire 1 is attached to the mounting hole 92 so that the optical axis J of the light source 30 intersects the ceiling surface 91 at an angle. The optical axis J intersects diagonally with respect to the vertical direction so as to extend toward the wall surface 93 which is the object of illumination by the luminaire 1. The angle formed by the vertical direction and the optical axis J is, for example, 10 ° or more and 40 ° or less, and is 30 ° as an example, but is not limited to this.

As shown in FIGS. 1 to 3, the lighting fixture 1 includes a fixture main body 10, a frame body 20, a light source 30, a reflection member 40, a mounting spring 50, and an optical member 100. Hereinafter, the details of each component included in the luminaire 1 will be described.

[Instrument body]
The instrument body 10 is a member in which the light source 30 is arranged. In the present embodiment, the instrument body 10 is a mounting base on which the light source 30 is mounted. The appliance body 10 also functions as a heat sink that dissipates heat generated by the light source 30. Therefore, the instrument body 10 is made of a material having high thermal conductivity, such as a metal material. Specifically, the instrument body 10 is made of aluminum die-cast made of aluminum. Alternatively, the instrument body 10 may be formed by sheet metal processing of an aluminum plate.

As shown in FIGS. 2 and 3, the instrument 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 heat radiation fins may be provided on the outside of the bottom of the instrument body 10.

The bottom of the instrument body 10 is provided with a plurality of through holes into which screws (not shown) for fixing the frame body 20 and the reflective member 40 are inserted. Screws are inserted into the through holes from the rear side of the bottom of the instrument body 10 and screwed into the screw holes provided in each of the frame 20 and the reflective member 40, whereby the frame 20 and the reflective member are inserted into the instrument body 10. 40 is fixed.

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

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

The outer cylinder portion 22 is a truncated cone-shaped portion having an optical axis J as a central axis. The outer cylinder portion 22 is provided so as to surround the outer surface of the inner cylinder portion 21. The front end of the outer cylinder portion 22 is connected to the front end of the inner cylinder portion 21.

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

The collar 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. The lighting fixture 1 is inserted into the mounting hole 92 provided in the ceiling plate 90, and the flange 24 and the plurality of mounting springs 50 sandwich the ceiling plate 90 around the mounting hole 92 in the ceiling plate 90. It is attached.

As shown in FIG. 3, about half of each of the inner cylinder portion 21 and the outer cylinder portion 22 protrudes forward from the collar 24. Therefore, when the luminaire 1 is attached to the mounting hole 92, the portion protruding forward from the collar 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 body 20 is made of, for example, aluminum die-cast. Alternatively, the frame body 20 may be formed by injection molding using a resin material such as polybutylene terephthalate (PBT).

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

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

For example, the light source 30 is composed of a COB (Chip On Board) type LED. Specifically, as shown in FIGS. 2 and 3, the light source 30 encapsulates 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. It is provided with a sealing member. The sealing member contains, for example, a fluorescent substance. In the present embodiment, the sealing member collectively seals all the LEDs 32, but the sealing member is not limited to this. A plurality of line-shaped sealing members may be formed along the arrangement direction of the plurality of LEDs 32 arranged in a line shape.

The light source 30 is placed and fixed on the mounting surface 11 of the instrument main body 10. In the luminaire 1, the direction of the optical axis J of the light source 30 (the z-axis direction in each figure) is a direction diagonally intersecting the vertical direction.

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

[Reflective member]
As shown in FIG. 3, the reflective member 40 has an end portion (front end) on the side where the light is emitted from the end portion (rear end) on the side where the light from the light source 30 is incident (the positive side of the z-axis). It has a tubular shape configured so 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 pair of claw-shaped portions 41 for supporting the optical member 100 are provided on the outer surface of the reflective member 40. The pair of claw-shaped portions 41 are arranged so as to face each other with a predetermined distance. The protruding portion 103 of the optical member 100 is inserted and locked between the pair of claw-shaped portions 41. In the present embodiment, the reflective member 40 includes three pairs of claw-shaped portions 41, but the number of claw-shaped portions 41 is not particularly limited.

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

The reflective 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 reflective member 40 may hold the base 31 of the light source 30 toward the mounting surface 11. As a result, by fixing the reflective member 40 to the fixture body 10, the light source 30 is also fixed to the fixture body 10.

The method of fixing the reflective member 40 and the instrument main body 10 is not particularly limited. For example, one of the reflective member 40 and the instrument main body 10 may be provided with a locking portion such as a claw, and the other may be provided with a locked portion such as a hole in which the locking portion is locked. The reflective member 40 may be fixed to the instrument main body 10 by locking the locked portion to the locked portion. Further, the reflective member 40 may be fixed to the frame body 20.

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

[Mounting spring]
The mounting spring 50 is used to mount the luminaire 1 in the mounting hole 92 provided in the ceiling. Specifically, the lighting fixture 1 can be mounted by sandwiching the ceiling plate 90 between the mounting spring 50 and the flange 24 of the frame body 20 by utilizing the restoring force of the mounting spring 50.

The mounting spring 50 is formed into a long strip shape by press working or the like using a metal material such as iron. In the present embodiment, as shown in FIG. 1, the luminaire 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 plate-shaped optical member having translucency. As shown in FIG. 3, the optical member 100 has a first main surface 101 and a second main surface 102 that face each other.

The first main surface 101 is a surface opposite to the light source 30, a surface on the emission side of light from the light source 30 and passing through the optical member 100. The second main surface 102 is a surface on the light source 30 side, and is a surface on the side where the light from the light source 30 is incident on the optical member 100. In the present embodiment, the optical member 100 is arranged so that the optical axis J passes through the center of each of the first main surface 101 and the second main surface 102.

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

At least a part of the optical member 100 protrudes from the 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 uneven structure 130 and the second prism 150 are located in the mounting holes 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 engaging the three projecting portions 103 with each of the three pairs of claw-shaped portions 41.

[Detailed shape of optical member]
Subsequently, the specific shape of the optical member 100 included in the lighting fixture 1 according to the present embodiment will be described with reference to FIGS. 4 to 6.

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

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

FIG. 6 is a cross-sectional view of the optical member 100 according to the present embodiment. Specifically, FIG. 6 shows a cross section in the VI-VI line of FIGS. 4 and 5. The cross section shown in FIG. 6 includes the optical axis J of the light source 30 and is a cross section parallel to the tilt direction (x-axis direction) of the light source 30.

In the present embodiment, each of the first main surface 101 and the second main surface 102 is a substantially circular surface whose plan view shape is centered on the optical axis J. The first main surface 101 and the second main surface 102 are substantially the same size as each other.

As shown in FIGS. 4 and 6, the first main surface 101 includes a first region 111 and a third region 113. The first region 111 is a region including the optical axis J, and is larger than the third region 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 region where the first prism 120 is provided is the first region 111.

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

The third region 113 is an region of the first main surface 101 excluding the first region 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 region provided with the first concavo-convex structure 130 is the third region 113.

As shown in FIGS. 5 and 6, the second main surface 102 includes a second region 112 and a fourth region 114. The second region 112 is a region including the optical axis J, and is larger than the fourth region 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 region provided with the second concavo-convex structure 140 is the second region 112. In the present embodiment, the second region 112 is the region opposite to the first region 111. The second region 112 has the same shape and the same size as the first region 111.

The fourth region 114 is a region of the second main 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 region where the second prism 150 is provided is the fourth region 114. In the present embodiment, the fourth region 114 is the region opposite to the third region 113. The fourth region 114 has the same shape and the same size as the third region 113.

In the present embodiment, the surface of at least one of the first main surface 101 and the second main surface 102 of the optical member 100 is provided with minute irregularities. The micro-concavities and convexities are, for example, a plurality of convex portions and concave portions randomly arranged in a random size formed by embossing.

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

In addition, the minute unevenness may be provided not only on the third region 113 but also on the entire surface of the first main surface 101 and the second main surface 102. Alternatively, the micro-concavities and convexities may be provided in at least one of the first region 111, the second region 112, the third region 113, and the fourth region 114.

Further, in the present embodiment, the plate 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 plate thickness t1 is larger than the plate thickness t2, the light Lc (see FIG. 7) described later can be efficiently emitted from the first main surface 101. Therefore, the amount of light emitted from the luminaire 1 can be increased.

[1st prism]
As shown in FIG. 3, the first prism 120 is located below the ceiling surface 91. The first prism 120 is provided on the light emitting side of a portion of the optical member 100 away from the wall surface 93. By refracting the light from the light source 30, the first prism 120 spreads out toward the wall surface 93 and in the lateral direction (y-axis direction).

As shown in FIG. 4, the first prism 120 has a plurality of first convex portions 121 extending along a plurality of first reference lines L1 when the first main surface 101 is viewed from the front. 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 end (or base end) of the first convex portion 121.

Each of the plurality of first reference lines L1 is convex from the reference point P toward a predetermined direction, and is line-symmetrical with an axis extending in a predetermined direction passing through the reference point P as an axis of symmetry. Here, the predetermined direction is a direction parallel to the first main surface 101 and a direction orthogonal to the optical axis J. Specifically, the predetermined direction is the direction connecting the reference point P and the center of the first main 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 tilting direction of the optical member 100.

The axis of symmetry of line symmetry is the 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 paper surface direction (negative direction of the x-axis) and is line symmetric with the VI-VI line as the axis of symmetry.

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

In this 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 convex portions 121 extends long along the corresponding first reference line L1.

The shapes of the plurality of first convex portions 121 are the same as each other in the cross section shown in FIG. The cross section shown in FIG. 6 is orthogonal to the first main surface 101 and includes an axis of symmetry. As shown in FIG. 6, each of the plurality of first protrusions 121 has two sides 122 and 123.

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

The side surface 123 intersects the direction orthogonal to the ceiling surface 91 (that is, the vertical direction) in parallel or at an angle of 10 ° or less. 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 connected alternately and continuously. As a result, a plurality of first convex portions 121 are provided side by side. The tip and base end (that is, the connection portion between the side surface 122 and the side surface 123) of the plurality of first convex portions 121 may be smooth or sharp.

[First uneven structure]
As shown in FIG. 3, the first uneven structure 130 is located above the ceiling surface 91 and in the mounting hole 92. The first uneven structure 130 is provided on the light emitting side of the portion of the optical member 100 near the wall surface 93. By refracting the light from the light source 30, the first uneven structure 130 expands and emits light in the lateral direction (y-axis direction). Further, the first uneven structure 130 also has a function of totally reflecting a part of the light from the light source 30 and returning it to the light source 30 side.

As shown in FIG. 4, the first uneven structure 130 is a plurality of grooves extending along a predetermined direction when the first main surface 101 is viewed from the front. 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 side by side 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 as each other 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 irregularly or regularly provided unevenness.

[Second uneven structure]
As shown in FIG. 3, the second uneven structure 140 is located below the ceiling surface 91. The second uneven structure 140 is provided on the light incident side of a portion of the optical member 100 away from the wall surface 93. The second uneven structure 140 expands in the lateral direction (y-axis direction) by refracting the light from the light source 30.

As shown in FIG. 5, the second uneven structure 140 is a plurality of grooves extending along a predetermined direction when the second main surface 102 is viewed from the front. 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 side by side 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 as each other in the yz cross section. The plurality of grooves constituting the second uneven structure 140 and the plurality of grooves constituting the first uneven 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 irregularly or regularly provided unevenness.

[Second prism]
As shown in FIG. 3, the second prism 150 is located above the ceiling surface 91 and in the mounting hole 92. The second prism 150 is provided on the light incident side of the portion of the optical member 100 near the wall surface 93. By refracting the light from the light source 30, the second prism 150 spreads out in a direction not blocked by the frame 20 and in the lateral direction (y-axis direction).

As shown in FIG. 5, the second prism 150 has a plurality of second convex portions 151 extending along each of the plurality of second reference lines L2 when the second main surface 102 is viewed from the front. In this embodiment, the second prism 150 further has 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 shown by broken lines in FIG. 5, respectively. As shown in FIG. 5, the plurality of third convex portions 155 are provided on the outer peripheral side of the second main surface 102 with respect to 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 (negative direction of the x-axis), and is axisymmetric with the VI-VI line as the axis of symmetry. Specifically, the plurality of second reference lines L2 are arcs of concentric circles centered on the reference point Q. The plurality of second reference lines L2 are provided at equal intervals. The plurality of second reference lines L2 may be parabolas, respectively. At this time, the focal point of each parabola is located on the axis of symmetry. For example, the focal point may be the reference point Q.

The reference point Q is an example of the second reference point. In the present embodiment, the reference point Q is different from the center of the second main surface 102, and in the example shown in FIG. 5, it is located on the outer periphery of the second main surface 102. Specifically, the reference point Q is located on the opposite side of the reference point P. In other words, the 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 convex portions 151 extends long along the corresponding second reference line L2.

The shapes of the plurality of second convex portions 151 are the same as each other in the cross section shown in FIG. As shown in FIG. 6, each of the plurality of second protrusions 151 has two sides 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 it toward the wall surface 93. That is, the side surface 152 is a surface that fulfills the main function of the second prism 150, that is, a light distribution control surface. The side surface 152 intersects the ceiling surface 91 at an angle of 10 ° or less or parallel to the ceiling surface 91 when the luminaire 1 is mounted in the mounting 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 that of the side surface 152. In the present embodiment, it is preferable that the side surface 153 is not a light distribution control surface and light is not incident as much as possible.

The side surface 153 intersects the side surface 152 at an angle. The crossing angle at this time is, for example, 50 ° or more and 90 ° or less. The angle of inclination 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 tilt 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 connected alternately and continuously. As a result, a plurality of second convex portions 151 are provided side by side. The tip and base end (that is, the connection portion between the side surface 152 and the side surface 153) of the plurality of second convex portions 151 may be smooth or sharp.

Each of the plurality of third reference lines L3 is convex from the third reference point toward a predetermined direction (negative direction of the x-axis), and is line-symmetrical with the VI-VI line as the 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. The plurality of third reference lines L3 may be parabolas, respectively. At this time, the focal point of each parabola is the third reference point and is located on the axis of symmetry.

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 smoothly connected, and the generation of unevenness of light can be suppressed. Alternatively, the third reference point may be located at a position farther from the center of the second main surface 102 than the second reference point.

In this 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 as each other in the cross section shown in FIG. At this time, in the cross section shown in FIG. 6, the shape of the plurality of third convex portions 155 is different from the shape of the plurality of second convex portions 151. As shown in FIG. 6, each of the plurality of third protrusions 155 has two sides 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 that of the side surface 152 of the second convex portion 151. In the present embodiment, it is preferable that the side surface 156 is not a light distribution control surface and light is not incident 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, in the cross section, the side surface 156 is smaller than the side surface 152.

The side surface 157 is an example of a fourth side surface whose inclination with respect to the ceiling surface 91 is larger than that of 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 a direction in which the light passing through the side surface 157 is easily totally reflected by the first uneven structure 130.

The side surface 157 intersects the side surface 156 at an angle. The crossing angle at this time is, for example, 35 ° or more and 75 ° or less. The angle of inclination of the side surface 157 with respect to the optical axis J is, for example, 0 ° or more and 25 ° or less. 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 tilt 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 connected alternately and continuously. As a result, a plurality of third convex portions 155 are provided side by side. The tip and base end (that is, the connection portion between the side surface 156 and the side surface 157) of the plurality of third convex portions 155 may be smooth or sharp.

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

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

FIG. 8 is an enlarged view of a main part showing a main 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 cross-sectional view showing the region VIII surrounded by the alternate long and short dash line in FIG. 7.

FIG. 9 is an enlarged view of a main part showing a main part of an optical path of a main light passing through a 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 cross-sectional view showing the region IX surrounded by the alternate long and short dash line in FIG. 7.

As shown in FIGS. 7 and 8, the light La is refracted when incident on the second concavo-convex structure 140 provided on the second main surface 102, and further, the first prism provided on the first main surface 101. It is refracted when emitted from 120. Specifically, the light La is refracted toward the wall surface 93 on the side surface 122 of the first convex portion 121 of the first prism 120.

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

As shown in FIGS. 7 and 9, the light Lb is refracted when incident on the second convex portion 151 of the second prism 150 provided on the second main surface 102, and is further provided on the first main surface 101. It is refracted when it is emitted from the first concavo-convex structure 130. Specifically, the light Lb is refracted on the side surface 152 of the second convex portion 151 in a direction approaching vertically downward. As a result, it is possible to suppress the light from being blocked by the frame body 20 and the like, so that the amount of light emitted from the luminaire 1 can be increased. Further, since the amount of light blocked by the frame body 20 can be reduced, the occurrence of uneven illuminance can be further suppressed.

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

When the second convex portion 151 is not provided, the light Lb is blocked by the frame body 20 and is not emitted toward the wall surface 93. That is, it causes uneven illuminance (uneven illuminance) due to the frame body 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 irradiation with high uniformity is realized. The degree of uniformity is represented by, for example, the ratio of the minimum value to the maximum value of the illuminance in 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 cylinder portion 21 of the frame body 20. Therefore, the light Lc is incident from the end surface of the optical member 100 without passing through the second main 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 is parallel to the vertical direction or intersects at an intersection angle of 10 ° or less, the light Lc is likely to be incident substantially perpendicular to the side surface 123. Therefore, the light Lc is emitted as it is on the side surface 123 with almost no refraction. As a result, 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 according to the present embodiment, the connection portion (corner) between the ceiling surface 91 and the wall surface 93 can also be illuminated.

In the present embodiment, the plate thickness t2 of the optical member 100 between the first region 111 and the second region 112 is thick. Therefore, the amount of light incident from the end surface of the optical member 100 increases, and the amount of light emitted from the side surface 123 increases.

As shown in FIGS. 7 and 9, the light Ld is refracted when incident on the third convex portion 155 of the second prism 150 provided on the second main surface 102, and is further provided on the first main surface 101. It 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 become light closer to the horizontal direction.

Therefore, since the light Ld is shallowly incident on the first main surface 101, total reflection is likely to occur in the first uneven 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 the total reflection is repeated, or proceeds so as to return to the light source 30 side.

When the third convex portion 155 is not provided, the light Ld is blocked by the frame body 20 and is not emitted toward the wall surface 93. That is, it causes uneven lighting (uneven illuminance) due to the frame body 20.

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

[Effects, etc.]
As described above, the optical member 100 according to the present embodiment is a plate-shaped optical member having translucency, and has a first main surface 101 and a second main surface 102 facing each other and a first main surface. It includes a first prism 120 provided in the first region 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 main 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 main surface 101 toward a predetermined direction parallel to the first main surface 101, and passes through the reference point P. , It is axisymmetric with the axis extending in a predetermined direction as the axis of symmetry.

As a result, it is possible to increase the amount of light emitted in a direction orthogonal to the first main surface 101 and in a plane including the axis of symmetry and in a direction close to a predetermined direction (negative direction of the x-axis). Therefore, when the lighting fixture 1 provided with the optical member 100 is installed so that the first main surface 101 is obliquely oriented with respect to the wall surface 93, the amount of light emitted to the wall surface 93 can be increased.

Further, a plurality of first convex portions 121 constituting the first prism 120 are provided so that their planar view shapes are convex toward 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, in the lateral direction). Therefore, when the lighting fixture 1 provided with the optical member 100 is installed so that the first main surface 101 is obliquely oriented with respect to the wall surface 93, it is possible to illuminate a 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, the 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 on the side opposite to the first region 111.

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

Further, for example, the optical member 100 is further provided with a second prism provided in the fourth region 114 of the second main surface 102 on the opposite side of the third region 113 different from the first region 111 of the first main surface 101. It is equipped with 150. The second prism 150 has a plurality of second convex portions 151 extending along each of the plurality of second reference lines L2 when the second main 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 symmetric with the above axis as the axis of symmetry.

Thereby, similarly to the first prism 120, the amount of light radiated to the wall surface 93 can be increased, and the range expanded in the lateral direction can be illuminated. Further, since it is possible to suppress the light from being blocked by the frame body 20 and the ceiling plate 90 of the lighting fixture 1, it is possible to suppress the occurrence of uneven illuminance.

Further, for example, the second prism 150 further has a plurality of third convex portions 155 extending along each of the plurality of third reference lines L3 when the second main 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 symmetric with the above axis as the axis of symmetry. In a cross section orthogonal to the second main surface 102 and including the axis, the shapes of the plurality of second convex portions 151 are the same as each other, and the shapes of the plurality of third convex portions 155 are the same as each other, and the plurality of third convex portions 155 are the same. It is different from the shape of the second convex portion 151.

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

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

As a result, the first uneven structure 130 diffuses the light, so that the light can be emitted in a wider range.

Further, for example, the first concavo-convex structure 130 or the second concavo-convex structure 140 is a plurality of grooves each extending in a predetermined direction.

As a result, light can be efficiently diffused in the lateral direction corresponding to the arrangement direction of the plurality of grooves.

Further, for example, the surface of at least one of the first main surface 101 and the second main surface 102 is provided with minute irregularities.

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

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

As a result, the amount of light scattered due to the minute irregularities can be suppressed by limiting the region where the minute irregularities are provided to only the second region 112. Therefore, it is possible to suppress the unevenness of illuminance while suppressing the decrease in the amount of light extracted from the optical member 100.

Further, for example, the plurality of first reference lines L1 are parabolas or arcs of concentric circles centered on the reference point P, respectively.

As a result, the planological shapes of the plurality of first convex portions 121 are smoothly bent along the first reference line L1, so that not only the light emitted in the predetermined direction but also the direction orthogonal to the predetermined direction (that is, that is). , Lateral direction) can also efficiently emit light.

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

As a result, it is possible to achieve a good balance between the emission of light toward the wall surface 93 and the diffusion of light in the lateral direction.

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

As a result, since the luminaire 1 includes the optical member 100, when the first main surface 101 is installed obliquely with respect to the wall surface 93, the amount of light emitted to the wall surface 93 is increased while the wall surface 93 is installed. It can illuminate a wide range.

FIG. 10 is a diagram showing a pattern of light (shape of an irradiation region) formed on a wall surface 93 when a plurality of conventional lighting fixtures 1x are arranged. FIG. 11 is a diagram showing a pattern of light (shape of an irradiation region) formed on a wall surface 93 when a plurality of lighting fixtures 1 according to the present embodiment are arranged. In addition, in FIGS. 10 and 11, dots are shaded in a region not irradiated with light from a plurality of lighting fixtures 1x or 1.

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

On the other hand, according to the lighting fixture 1 according to the present embodiment, the optical member 100 can sufficiently spread the light in the lateral direction, so that the wall surface 93 can be illuminated with uniform illuminance. As described above, according to the lighting fixture 1 according to the present embodiment, high uniformity can be realized.

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

Therefore, in order to suppress the formation of the scallop, the luminaire 1x must be installed by shortening the distance between the adjacent luminaires 1x. As a result, the number of 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, since the light is emitted toward the corner of the ceiling, the upper part of the wall surface 93 can be widely illuminated. As a result, the wall surface 93 can be illuminated with a small number of units while suppressing the formation of scallops.

Further, for example, the optical member 100 is arranged so that the optical axis J of the light source 30 passes through the center of each of the first main surface 101 and the second main surface 102. The second main surface 102 is a surface on the light source 30 side.

As a result, since the first prism 120 is provided on the emission surface side of the light from the light source 30, the 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 projects from the mounting hole 92 provided in the ceiling surface 91. ing. The optical axis J of the light source 30 intersects the ceiling surface 91 at an angle.

As a result, it is possible to suppress the light from being blocked by the ceiling plate 90, so that the amount of light emitted to the wall surface 93 can be increased.

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

As a result, the light reflected by the frame 20 of the luminaire 1 and traveling substantially parallel to the ceiling surface 91 can be emitted from the side surface 122, so that the amount of light emitted from the luminaire 1 can be increased. Can be done. Further, the connection portion between the ceiling surface 91 and the wall surface 93, that is, the corner of the ceiling can be illuminated.

Further, for example, the optical member 100 is arranged so that the optical axis J of the light source 30 passes through the center of each of the first main surface 101 and the second main surface 102. The second main 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 main surface 102 with respect to the plurality of second convex portions 151. Each of the plurality of second convex portions 151 has a side surface 152 and a side surface 153 whose inclination with respect to the ceiling surface 91 is larger than that of the side surface 152. Each of the plurality of third convex portions 155 has a side surface 156 having an inclination with respect to the ceiling surface 91 greater than the side surface 152 and a side surface 157 having an inclination with respect to the ceiling surface 91 greater than the side surface 156.

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

(others)
Although the optical member and the lighting fixture according to the present invention have been described above based on the above-described embodiment, the present invention is not limited to the above-described embodiment.

For example, the optical member 100 does not have to include at least one of the first concavo-convex structure 130, the second concavo-convex 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 main 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 main surface 101. Further, the first main 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, or the main surface on the opposite side to the light source 30 may be a flat surface.

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

Further, for example, the second prism 150 may not include a plurality of third convex portions 155, and may include only a 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, a flat surface may be provided instead of the plurality of third convex portions 155.

Further, for example, the plurality of first reference lines L1 may not be concentric circles and may be along a plurality of arcs having different centers. Alternatively, at least one of the plurality of first reference lines L1 may be an arc, and the other at least one may be a parabola. Further, the plurality of first reference lines L1 may be an elliptical arc. 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 convex portions 121, the plurality of second convex portions 151, and the plurality of third convex portions 155 may not be flat or may be curved surfaces.

For example, the reference point P, which is an example of the first reference point, may be provided outside the first main surface 101, not on the outer periphery of the first main surface 101. The farther the reference point P is from the first main surface 101, the closer the plurality of first reference lines L1 are to a straight line along the y-axis. For this reason, the emission of light in the wall direction becomes dominant rather than the spread of light in the lateral direction. Further, the reference point P may be located within the first main surface 101 in a plan view.

Further, for example, in the above embodiment, an example in which the light source 30 is a COB type LED module has been described, but 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 other solid-state light emitting elements such as an organic EL (Electroluminescence) element or a laser element instead of the LED 32.

Further, for example, the lighting fixture 1 does not have to be an embedded lighting fixture such as a downlight, and may be a spotlight.

In addition, it can be realized by arbitrarily combining the components and functions in each embodiment within the range obtained by applying various modifications to each embodiment and the purpose of the present invention. Forms are also included in the present invention.

1 Lighting equipment 30 Light source 91 Ceiling surface (installation surface)
92 Mounting hole (through hole)
100 Optical member 101 1st main surface 102 2nd main surface 111 1st region 112 2nd region 113 3rd region 114 4th region 120 1st prism 121 1st convex portion 122, 123 Side surface 130 1st uneven structure 140 2nd Concavo-convex structure 150 Second prism 151 Second convex portion 152 Side surface (first side surface)
153 side surface (second side surface)
155 Third convex part 156 Side surface (third side surface)
157 side (4th side)
J Optical axis L1 1st reference line L2 2nd reference line L3 3rd reference line P reference point (1st reference point)
Q reference point (second reference point, third reference point)

Claims (15)

A plate-shaped optical member with translucency,
The first and second main surfaces that face each other,
A first prism provided in the first region of the first main surface is provided.
The first prism has a plurality of first convex portions extending along each of the 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 from a first reference point different from the center of the first main surface toward a predetermined direction parallel to the first main surface, and is the first reference. It is axisymmetric with the axis passing through the point and extending in the predetermined direction as the axis of symmetry .
Used for lighting equipment,
Optical member. Moreover,
The optical member according to claim 1, further comprising a concavo-convex structure provided in the second region of the second main surface opposite to the first region. A plate-shaped optical member with translucency,
The first and second main surfaces that face each other,
A first prism provided in the first region of the first main surface is provided.
The first prism has a plurality of first convex portions extending along each of the 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 from a first reference point different from the center of the first main surface toward a predetermined direction parallel to the first main surface, and is the first reference. It is axisymmetric with the axis passing through the point and extending in the predetermined direction as the axis of symmetry.
The optical member further
A second prism provided in the fourth region of the second main surface on the opposite side of the third region different from the first region of the first main surface is provided.
The second prism has a plurality of second convex portions extending along each of the plurality of second reference lines when the second main surface is viewed from the front.
Each of the plurality of second reference lines is convex from the second reference point toward the predetermined direction and is axisymmetric with the axis as the axis of symmetry.
Optical member. The second prism further has a plurality of third protrusions extending along each of the 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 axisymmetric with the axis as the axis of symmetry.
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 each other.
The optical member according to claim 3, wherein the shapes of the plurality of third convex portions are the same as each other and are different from the shapes of the plurality of second convex portions. Moreover,
The optical member according to claim 3 or 4, which has a concavo-convex structure provided in the third region. The optical member according to claim 2 or 5, wherein the uneven structure is a plurality of grooves, each of which extends in a predetermined direction. A plate-shaped optical member with translucency,
The first and second main surfaces that face each other,
A first prism provided in the first region of the first main surface is provided.
The first prism has a plurality of first convex portions extending along each of the 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 from a first reference point different from the center of the first main surface toward a predetermined direction parallel to the first main surface, and is the first reference. It is axisymmetric with the axis passing through the point and extending in the predetermined direction as the axis of symmetry.
Micro unevenness is provided on at least one surface of the first main surface and the second main surface.
Optical member. 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 a 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 outside the first main surface. Light source and
A luminaire comprising the optical member according to any one of claims 1 to 10, which allows light from the light source to pass through. The optical member is arranged so that the optical axis of the light source passes through the 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 projects from the through hole provided in the predetermined installation surface.
The luminaire according to claim 12, wherein the optical axis of the light source intersects the installation surface at an angle. The luminaire according to claim 13, wherein each of the plurality of first convex portions has a side surface parallel to the direction orthogonal to the installation surface or intersecting at an angle of 10 ° or less. It ’s a lighting fixture,
Light source and
The optical member according to claim 4 is provided.
The luminaire is partially embedded and arranged in a through hole provided on a predetermined installation surface.
The optical member is arranged so that the optical axis of the light source passes through the 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 with respect to the plurality of second convex portions.
Each of the plurality of second convex portions is
The first aspect and
It has a second side surface whose inclination with respect to the installation surface is larger than that of the first side surface.
Each of the plurality of third convex portions is
A third side surface whose inclination with respect to the installation surface is larger than that of the first side surface,
A luminaire having a fourth side surface whose inclination with respect to the installation surface is larger than that of the third side surface.

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