JP2019083105A - Light fitting lens plate and light fitting - Google Patents

Abstract

To provide a lens plate disposed in front of a light source portion of a light fitting, and which can make the brightness of an illuminated surface such as a wall surface uniform.SOLUTION: A lens plate 1A is disposed in front of a light source portion so as to make a light incident surface 2 vertical to an optical axis direction of the light source portion. The light incident surface 2 is equipped with a lens area 4 in which a plurality of concave lens units 5 having the same shape and size in the optical axis direction each other are aligned in plural rows in a staggered and flat surface filling shape. When a row direction of the concave lens units 5 in the light incident surface 2 is considered as an X-axis direction of the concave lens units 5, the concave lens units 5 are formed in concave surface shapes scattering incident light so as to expand transmitted light to both sides in the X-axis direction of the concave lens units 5. Furthermore, the width of both end portions in the X-axis direction of the recessed lens unit 5 is wider than the width of a middle portion in the X-axis direction in an optical axis direction view.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a lens plate and a luminaire disposed in front of a light source unit of a luminaire (eg, a spotlight, a downlight).

  For example, a spotlight, a downlight (e.g., universal downlight), etc. may be used as a lighting device for illuminating, for example, a vertical wall surface. When illuminating a wall surface with such a luminaire, in general, the luminaire is installed at a high position such as a ceiling to illuminate the wall surface obliquely downward with respect to the wall surface from above.

  JP 2006-24521 A (Patent Document 1) and JP 2008-98068 A (Patent Document 2) are lens plates (including a prism plate) disposed in front of a light source portion of such a lighting fixture. Is disclosed.

Unexamined-Japanese-Patent No. 2006-24521 JP 2008-98068 A

  Thus, when illuminating a surface to be illuminated such as a wall surface with a lighting fixture, it may be better to illuminate the surface to be as uniform as possible in terms of the effect of illumination.

  Therefore, the present invention is to provide a lens plate disposed in front of a light source portion of a lighting fixture and capable of achieving uniform brightness of a surface to be illuminated such as a wall surface, and brightness of the surface to be illuminated such as a wall surface It is an object of the present invention to provide a luminaire which can achieve uniformity in

  The present invention provides the following means.

[1] A lens plate for a luminaire, which is disposed in front of a light source of the luminaire,
A light incident surface on which light from a light source unit of a lighting fixture is incident is provided, and is disposed in front of the light source unit such that the light incident surface is perpendicular to the optical axis direction of the light source unit. ,
The light incident surface includes a lens area in which a plurality of concave lens units having the same shape and size as viewed in the optical axis direction are arranged in a plurality of rows in a zigzag and in a plane filling shape,
The row direction of the concave lens unit in the light incident plane is the X axis direction of the concave lens unit, the direction orthogonal to the X axis direction in the light incident plane is the Y axis direction of the concave lens unit, and the optical axis direction When the length of the concave lens unit in the Y-axis direction is the width of the concave lens unit,
The concave lens unit is formed in a concave shape for diffusing incident light so that transmitted light spreads on both sides in the X axis direction of the concave lens unit, and both ends in the X axis direction of the concave lens unit in the optical axis direction view Lens plate for lighting fixtures, where the width of the part is wider than the width of the middle part in the X-axis direction.

  [2] The concave lens unit is a first concave portion that diffuses incident light so that transmitted light spreads only on both sides in the X axis direction of the concave lens unit, and both sides of the transmitted light in the X axis direction of the concave lens unit and Y The lens board for the luminaire according to the preceding paragraph 1, further comprising: a second concave portion for diffusing incident light so as to spread on one side in the axial direction.

  [3] Further, in front of the light source part of the lighting fixture illuminating the surface to be illuminated in the oblique direction with respect to the surface to be illuminated, the concave lens unit so that the X axis direction of the concave lens unit becomes parallel to the surface to be illuminated The lens plate for illumination fixtures of the preceding clause 2 arrange | positioned so that the said one side of the Y-axis direction may become the light source part proximity side in the said to-be-illuminated surface.

[4] The first concave portion is provided on the other side in the Y axis direction in the concave lens unit,
The lens plate for illumination fixtures of said 2 or 3 in which the said 2nd concave part is provided in the said one side of the Y-axis direction in the said concave lens unit.

[5] The first concave portion is formed of a concave cylindrical surface,
The second concave portion is formed of a concave spherical surface,
5. Lens plate for illumination fixtures in any one of the preceding clauses to which said 1st concave part and said 2nd concave part are connected mutually smoothly.

  [6] The luminaire according to any one of the aforementioned Items 1 to 5, wherein the width of the concave lens unit in the optical axis direction view is substantially expanded as it proceeds from the X axis direction intermediate portion to the X axis direction both ends in the concave lens unit. Lens plate.

  [7] The lens plate for a luminaire according to any one of the above 1 to 6, wherein the lens area is provided entirely on the light incident surface.

  [8] The lens plate for a luminaire according to any one of the above 1 to 6, wherein the lens area is partially provided on the light incident surface.

[9] A luminaire equipped with a light source unit,
The lighting fixture provided with the lens board in any one of the preceding clauses 1-8 as a lens board arrange | positioned ahead of a light source part.

  The present invention has the following effects.

  In the lens plate of the preceding paragraph [1], the light incident surface of the lens plate is provided with a lens region in which a plurality of concave lens units having the same shape and size as viewed in the optical axis direction are arranged in a plane filling shape. Incident light incident on the lens area of the light incident surface of the lens plate from the light source unit necessarily passes through any concave lens unit, and all concave lens units of light quantity per unit area of incident light incident on each part of the lens unit The total amount of is approximately equal. Furthermore, the concave lens unit is formed in a concave shape that diffuses the incident light so that the transmitted light spreads on both sides in the X axis direction of the concave lens unit, and at both ends of the concave lens unit in the X axis direction Since the width is wider than the width of the middle portion in the X-axis direction, it is possible to increase the amount of transmitted light that spreads on both sides in the X-axis direction of the concave lens unit. Thereby, the brightness of the illuminated surface can be made uniform.

  In the preceding paragraph [2], the concave lens unit is a first concave portion that diffuses incident light so that the transmitted light spreads only on both sides in the X axis direction of the concave lens unit, Y on both sides of the concave lens unit in the X axis direction and Y Since the second concave portion for diffusing the incident light so as to spread on one side in the axial direction is included, the transmitted light transmitted through the second concave portion of the concave lens unit is only on both sides in the X axis direction of the concave lens unit It also spreads on one side of the concave lens unit in the Y-axis direction.

  Therefore, in the case where the lighting device illuminates, for example, the surface to be illuminated in a direction oblique to the surface to be illuminated, the lens plate is arranged such that the X axis direction of the concave lens unit is parallel to the surface to be illuminated The brightness on the light source side near the light source surface is reduced by arranging it in front of the light source side so that one side in the Y-axis direction is the light source side near the light source surface. Get close. Thereby, the area | region which can achieve equalization | homogenization about the brightness of a to-be-illuminated surface can be expanded to the light source part proximity side in a to-be-illuminated surface.

  In particular, in the case where the luminaire illuminates the vertical wall surface as the illumination surface in the oblique direction with respect to the wall surface, and the lens area of the lens plate is provided entirely on the light incident surface (previous [7] In the case of), it is possible to realize wall wash lighting with less unevenness of brightness.

  In the above [3], the effect of the previous term [2] can be reliably produced.

  In the preceding paragraphs [4] and [5], the effects of the preceding paragraphs [2] and [3] can be reliably exhibited.

  In the preceding paragraph [6], the brightness of the surface to be illuminated can be reliably made uniform.

  In the preceding paragraph [7], since the lens area is provided entirely on the light incident surface of the lens plate, the brightness of the light receiving surface can be made uniform entirely.

  In the preceding paragraph [8], the brightness of the surface to be illuminated can be partially made uniform.

  In the lighting fixture of preceding clause [9], the same effect as the effect in any one of preceding clause [1]-[8] can be show | played.

FIG. 1 is a view (plan view) of a lens plate for a lighting fixture according to a first embodiment of the present invention as viewed from the optical axis direction of a light source unit of the lighting fixture. FIG. 2 is an end view taken along the line A-A in FIG. FIG. 3 is an end view taken along line B-B in FIG. FIG. 4 is an enlarged perspective view of the lens area of the light incident surface of the same lens plate. FIG. 5 is an enlarged view of a portion C in FIG. FIG. 6 is an end view of a D1-D1 line cutting portion in FIG. FIG. 7 is an end view of a D2-D2 line cutting portion in FIG. FIG. 8 is an end view taken along line E1-E1 in FIG. FIG. 9 is an end view taken along line E2-E2 in FIG. FIG. 10 is a view for explaining the use state of the lens plate. FIG. 11 is an example of a wall surface illuminance distribution map of a spotlight when the same lens plate is used. FIG. 12 is an example of a wall surface illuminance distribution map of the spotlight in the case where the lens plate is not used. FIG. 13 is a view (plan view) of the lens plate for a lighting fixture according to the second embodiment of the present invention as viewed from the optical axis direction of the light source unit of the lighting fixture. FIG. 14 is an end view taken along the line A-A in FIG. FIG. 15 is a view for explaining the use state of the figure lens plate. FIG. 16 is an example of a wall surface illuminance distribution map of a spotlight when the same lens plate is used.

  Several embodiments of the present invention are described below with reference to the drawings.

  As shown in FIGS. 1 to 3, the lens plate 1A for a lighting fixture according to the first embodiment of the present invention is an optical lens plate, and it is made of colorless and transparent plastic, and its shape is a substantially circular plate. It is a state.

  A lighting fixture to which this lens plate 1A is applied is, for example, a spotlight 11 as shown in FIG. The spotlight 11 illuminates (illuminates) a vertical wall surface 31 as a surface to be illuminated obliquely downward with respect to the wall surface 31 from the upper side, and is installed at a high position (for example, the ceiling 32) with respect to the wall surface 31 It is done. The code "33" in the figure is a floor.

  The spotlight 11 is mounted with a light source unit 12 having a light source body (e.g., an LED light source body) and the like. The alternate long and short dash line P in FIG. 10 indicates the optical axis of the light source unit 12 of the spotlight (lighting fixture) 11. The light from the light source unit 12 is emitted in the optical axis P direction. The code "13" in the figure is a reflecting mirror of the light source unit 12.

  The lens plate 1A, as shown in FIGS. 1 to 3, uses one of the surfaces on both sides in the thickness direction as the light incident surface 2 to which the light from the light source unit 12 of the spotlight 11 is incident. The other surface is the light emitting surface 3.

  The light incident surface 2 and the light emitting surface 3 of the lens plate 1A are each formed in a circular shape. At the outer peripheral edge of the lens plate 1A, an annular collar portion 1a projecting integrally to the light incident surface 2 is integrally formed in a manner surrounding the light incident surface 2.

  Then, in the lens plate 1A, the light axis P of the light source unit 12 is the center O of the light incident surface 2 so that the light incident surface 2 is perpendicular to the light axis P direction of the light source unit 12 of the spotlight 11. The light source unit 12 is removably disposed near the front of the light source unit 12 so as to pass therethrough (see FIG. 10). A short cylindrical hood (not shown) for reducing direct glare may be attached in the vicinity of the front of the lens plate 1A in the spotlight 11 so as to surround the lens plate 1A.

  As shown in FIGS. 2 and 3, the light emitting surface 3 of the lens plate 1A is formed in a smooth shape.

  As shown in FIG. 1, a lens area 4 composed of a large number of concave lens units 5 having a polygonal shape which can be plane-filled alone covers the entire surface of the light incident surface 2 on the light incident surface 2 of the lens plate 1A. It is formed.

  As shown in FIGS. 1, 4 and 5, in the lens area 4, the large number of concave lens units 5 have the same shape and size as viewed in the direction of the optical axis P, in a plurality of rows in a zigzag and in plane filling It is arranging. Since the concave lens units 5 are arranged in a plane-filling manner, in the lens area 4, there is substantially no space (region without concave lens units 5) between the concave lens units 5 adjacent to each other.

  The diameter of the light incident surface 2 of the lens plate 1A is set according to the diameter of the light irradiation port of the spotlight 11 and the like and is not limited, and is, for example, 40 to 110 mm.

  Here, in order to make the configuration of the lens plate 1A easy to understand, as shown in FIGS. 1 to 5, the row direction of the concave lens unit 5 in the light incident surface 2 is the X axis direction of the concave lens unit 5 and the lens plate 1A. The direction orthogonal to the X axis direction in the entrance surface 2 is the Y axis direction of the concave lens unit 5 and the lens plate 1A, and the direction perpendicular to the light entrance surface 2, that is, the optical axis P direction of the light source unit 12 is the concave lens unit 5 and lens It defines as the Z-axis direction of board 1A. The X axis direction, the Y axis direction, and the Z axis direction are perpendicular to each other.

  In addition, an axis parallel to the row direction of the concave lens units 5 in the light incident surface 2 passing through the center O of the light incident surface 2 passes through the X axis of the lens plate 1A and the center O of the light incident surface 2 in the light incident surface 2 An axis orthogonal to the X axis is defined as the Y axis of the lens plate 1A, and an axis perpendicular to the light incident surface 2 through the center O of the light incident surface 2 is defined as the Z axis of the lens plate 1A. The X axis, the Y axis, and the Z axis are orthogonal to each other at the center O of the light incident surface 2.

  Also, as shown in these figures, both sides in the X axis direction are defined as “−X side” and “+ X side”, and both sides in the Y axis direction as “−Y side” and “+ Y side”. Among the two sides in the Z-axis direction, the upstream side and the downstream side with respect to the light incident direction are defined as “−Z side” and “+ Z side”, respectively.

  Further, as shown in FIG. 5, the length of the concave lens unit 5 in the X axis direction in the optical axis P direction is “length L of the concave lens unit 5”, and the Y axis of the concave lens unit 5 in the optical axis P direction The length of the direction is defined as "width W of concave lens unit 5".

  As shown in FIG. 5, the shape of the concave lens unit 5 is a substantially butterfly ribbon shape in the optical axis P direction. That is, the width W2 of one end of the concave lens unit 5 in the X-axis direction and the width W2 of the other end in the X-axis direction are equal to each other in the optical axis P direction, and W2 is the width W1 of the intermediate portion of the concave lens unit 5 in the X-axis direction. It is wider than (ie, W2> W1). Also, W1 is greater than 0 (ie, W1> 0). Furthermore, the width W of the concave lens unit 5 in the direction of the optical axis P substantially increases as it proceeds from the X axis direction intermediate portion of the concave lens unit 5 to both X axis direction end portions.

  The values of W1, W2 and L are not limited. In particular, W1 is preferably set to 0.7 to 2.8 mm, W2 to 1.5 to 6.3 mm, and L to 2.2 to 9.1 mm.

  Furthermore, as shown in FIGS. 6 and 7, basically, the concave lens unit 5 transmits light 22 transmitted through the concave lens unit 5 on both sides in the X-axis direction of the concave lens unit 5 (that is, −X side and + X side) It is formed in the concave shape which diffuses the incident light 21 from the light source part 12 so that it may spread.

  The shape of the concave lens unit 5 will be described in detail below.

  As shown in FIGS. 4 and 5, the concave lens unit 5 is composed of a first concave portion 6 and a second concave portion 7. The first concave portion 6 and the second concave portion 7 are adjacent to each other in the Y-axis direction of the concave lens unit 5, and the second concave portion 7 is the first concave surface on one side (+ Y side) in the Y-axis direction of the concave lens unit 5 The portion 6 is disposed on the other side (−Y side) of the concave lens unit 5 in the Y axis direction. The two-dot chain line 8 in FIGS. 4 and 5 indicates an imaginary boundary between the first concave portion 6 and the second concave portion 7 in the concave lens unit 5.

  As shown in FIGS. 6, 8 and 9, in the concave lens unit 5, the first concave portion 6 is incident such that the transmitted light 22 spreads only on both sides (−X side and + X side) of the concave lens unit 5 in the X axis direction. A portion for diffusing the light 21 and formed by a concave cylindrical surface (specifically, a part of the concave cylindrical surface). The central axis of the first concave portion 6 (that is, the cylindrical axis of the above-mentioned concave cylindrical surface) is parallel to the Y-axis direction of the concave lens unit 5.

  As shown in FIGS. 7 to 9, in the concave lens unit 5, the second concave portion 7 has both sides (−X side and + X side) of the concave lens unit 5 in the transmitted light 22 of the concave lens unit 5 and one side (Y axis direction) A portion that diffuses the incident light 21 so as to spread only to the + Y side), and is formed of a concave spherical surface (a part of the concave spherical surface in detail). The radius of curvature of the second concave portion 7 (that is, the radius of curvature of the above-described concave spherical surface) is equal to the radius of curvature of the first concave portion 6.

  The radius of curvature of the first curved surface portion 6 and the second curved surface portion 7 is not limited, and it is particularly desirable that the radius of curvature is R 2.5 to 7.5 mm.

  Furthermore, the first concave portion 6 and the second concave portion 7 are smoothly connected to each other so that there is no step between the two. Therefore, the center of curvature of the second concave portion 7 is located at an end position of the second concave portion 7 on the central axis of the first concave portion 6.

  Then, in the lens plate 1A, one side (+ Y side) of the concave lens unit 5 in the Y axis direction is closer to the light source unit 12 in the wall surface 31 so that the X axis direction of the concave lens unit 5 is parallel to the wall surface 31. The other side (−Y side) of the concave lens unit 5 in the Y-axis direction is disposed near the front of the light source unit 12 so that the light source unit 12 on the wall surface 31 is on the remote side.

  Here, as described above, since the spotlight 11 illuminates the wall surface 31 obliquely downward with respect to the wall surface 31 from the upper side, the lens plate 1A is disposed in the vicinity of the front of the light source unit 12 as described above. In the closed state, the X axis direction of the concave lens unit 5 is parallel and horizontal to the wall surface 31, and one side (+ Y side) of the concave lens unit 5 in the Y axis direction is the upper side of the wall surface 31. The other side (−Y side) in the Y-axis direction is directed to the lower side of the wall surface 31. Therefore, the X-axis direction of the concave lens unit 5 is in the left-right direction of the wall surface 31.

  The lens plate 1A of the first embodiment has the following advantages.

  The light incident surface 2 of the lens plate 1A is provided with a lens area 4 in which a large number of concave lens units 5 having the same shape and size as viewed in the direction of the optical axis P are arranged in a plane filling shape The incident light 21 incident on the lens area 4 of the light incident surface 2 of the lens plate 1A always passes through any concave lens unit 5, and the light quantity per unit area of the incident light 21 incident on each portion of the lens unit 5 The total amount for the all concave lens unit 5 is approximately equal. Furthermore, concave lens unit 5 is formed in a concave shape that diffuses incident light 21 so that transmitted light 22 spreads on both sides (−X side and + X side) of concave lens unit 5 in the X-axis direction, and the optical axis Since the width W2 of both end portions of the concave lens unit 5 in the X axis direction in the P direction is wider than the width W1 of the middle portion in the X axis direction, the transmission spreads on both sides (+ X side and −Y side) of the concave lens unit 5 in the X axis direction. The amount of light can be increased. As a result, it is possible to make the brightness (illuminance) of the wall surface 31 uniform (that is, to reduce the unevenness of the brightness).

  Furthermore, the spotlight 11 illuminates the wall surface 31 obliquely to the wall surface 31, and the X axis direction of the concave lens unit 5 is parallel to the wall surface 31 and the Y axis direction of the concave lens unit 5 In the case where the lens plate 1A is disposed near the front of the light source unit 12 such that one side (+ Y side) of the light source unit 12 is closer to the light source unit 12 in the wall surface 31, as shown in FIGS. The transmitted light 22 transmitted through the second concave portion 7 is not only on both sides (−X side and + X side) of the concave lens unit 5 in the X axis direction but also on one side (+ Y side) of the concave lens unit 5 in the Y axis direction Since the light source unit 12 is also spread on the side closer to the light source unit 12, the brightness (illuminance) on the light source unit 12 side of the wall surface 31 decreases and approaches the brightness (illuminance) on the remote side of the light source unit 12. Therefore, it is possible to expand the area in which the brightness of the wall surface 31 can be made uniform to the side closer to the light source unit 12 in the wall surface 31.

  In particular, as shown in FIG. 10, in the case where the spotlight 11 illuminates the wall surface 31 obliquely downward with respect to the wall surface 31 from the upper side, the transmitted light transmitted through the second concave portion 7 of the concave lens unit 5 22 denotes both sides (−X side and + X side) of the concave lens unit 5 in the X axis direction, ie, one side (+ Y side) of the concave lens unit 5 in the Y axis direction, not only the right side and left side of the wall 31 Since the light also spreads on the upper side of 31, the brightness (illuminance) on the upper side of the wall surface 31 decreases and approaches the brightness (illuminance) on the lower side. Therefore, it is possible to expand the area in which the brightness of the wall 31 can be made uniform to the upper side of the wall 31.

  Furthermore, the first concave portion 6 of the concave lens unit 5 is provided on the other side (−Y side) in the Y axis direction of the concave lens unit 5, and the second concave portion 7 of the concave lens unit 5 is in the Y axis direction of the concave lens unit 5 Since it is provided on one side (the + Y side), the brightness of the wall surface 31 can be reliably made uniform.

  Furthermore, the first concave portion 6 is formed by a concave cylindrical surface, the second concave portion 7 is formed by a concave spherical surface, and the first concave portion 6 and the second concave portion 7 are smoothly connected to each other. Thereby, the brightness of the wall surface 31 can be reliably made uniform.

  Furthermore, since the lens area 4 is formed on the entire surface of the light incident surface 2 of the lens plate 1A, it is possible to realize wall wash illumination with less unevenness in brightness.

  Furthermore, since the width W of the concave lens unit 5 in the optical axis P direction is substantially expanded as it proceeds from the X axis direction intermediate portion of the concave lens unit 5 to both X axis direction end portions, the brightness of the wall surface 31 is more uniformly uniform. Can be implemented.

  FIG. 11 is an example of a wall surface illuminance distribution map of the spotlight 11 in the case of using the lens plate 1A of the first embodiment.

  Moreover, FIG. 12 is an example of a wall surface illuminance distribution map of the spotlight 11 in the case where the lens plate 1A is not used.

  The measurement conditions of each distribution chart (the same applies to FIG. 16 described later) are as follows.

  The attachment position of the spotlight 11 is a position 0.9 m away from the wall surface 31, and the light irradiation direction of the spotlight 11 is a direction inclined 30 ° toward the wall surface 31 with respect to the vertically downward direction. The color temperature of is warm white 3500K, and its color rendering property is Ra 83.

  In the case where the distribution diagram of FIG. 11 is measured, as described above, in the lens plate 1A, the light incident surface 2 of the lens plate 1A is perpendicular to the optical axis P direction of the light source unit 12 of the spotlight 11. The light source unit 12 is disposed near the front of the light source unit 12 of the spotlight 11 so that the optical axis P of the light source unit 12 passes through the center O of the light incident surface 2. Near the front of the light source unit 12 so that the direction is parallel to and horizontal to the wall surface 31 and one side (+ Y side) of the concave lens unit 5 in the Y-axis direction is the upper side of the wall surface 31 It is arranged.

  As apparent from the distribution diagram of FIG. 11 and the distribution diagram of FIG. 12, by arranging the lens plate 1A in the front vicinity of the light source unit 12 of the spotlight 11, wall wash illumination with less unevenness of brightness It can be realized.

  FIGS. 13-16 is a figure explaining the lens plate 1B for lighting fixtures which concerns on 2nd Embodiment of this invention. In these drawings, the same elements as the elements of the lens plate 1A of the first embodiment are denoted by the same reference numerals as those of the elements of the lens plate 1A. Hereinafter, the second embodiment will be described focusing on differences from the first embodiment.

  In the lens plate 1B of the second embodiment, as shown in FIGS. 13 and 14, the lens area 4 is partially provided on the light incident surface 2 of the lens plate 1B. More specifically, as shown in FIG. 13, the lens area 4 is a lens plate at the light incident surface 2 from the center O of the light incident surface 2 of the lens plate 1B in the optical axis P direction of the light source unit 12 of the spotlight 11. In at least a part of the region on one side (+ Y side) in the Y-axis direction of 1 B, they are formed in line symmetry with respect to the Y-axis passing through the center O of the light incident surface 2. The peripheral edge 4a on one side (+ Y side) in the Y axis direction of the lens plate 1B in the lens area 4 coincides with the outer peripheral edge on one side (+ Y side) in the Y axis direction of the lens plate 1B on the light incident surface 2. The peripheral edge 4b on the other side (−Y side) in the Y axis direction of the lens plate 1B in the lens area 4 is the outer peripheral edge on one side (+ Y side) in the Y axis direction of the lens plate 1B on the light incident surface 2 It is formed in a substantially arc shape passing through the center O of the light incident surface 2 with the point Q of intersection with the Y axis passing the center O of the light incident surface 2 as the center.

  A portion 9 of the light incident surface 2 of the lens plate 1B where the lens region 4 is not formed (hereinafter, this portion is referred to as "the non-lens region 9 of the light incident surface 2") is formed in a smooth shape.

  Like the lens plate 1A of the first embodiment, the lens plate 1B has one side (+ Y side) of the concave lens unit 5 in the Y axis direction such that the X axis direction of the concave lens unit 5 is parallel to the wall surface 31. Are arranged near the front of the light source unit 12 so that the other side (−Y side) of the concave lens unit 5 in the Y axis direction of the wall surface 31 is closer to the light source unit 12 on the wall surface 31 It is done.

  Here, as described above, since the spotlight 11 illuminates the wall surface 31 obliquely downward with respect to the wall surface 31 from the upper side as shown in FIG. 15, the lens plate 1A of the first embodiment is Similarly, in the state where the lens plate 1B is disposed in the vicinity of the front of the light source unit 12 as described above, the X-axis direction of the concave lens unit 5 is parallel to the wall surface 31 and is horizontal. One side (+ Y side) of the direction is directed to the upper side of the wall 31 and the other side (−Y side) of the concave lens unit 5 in the Y-axis direction is directed to the lower side of the wall 31. Therefore, the X-axis direction of the concave lens unit 5 is in the left-right direction of the wall surface 31.

  As shown in FIG. 15, when the lens plate 1B is disposed in the vicinity of the front of the light source unit 12 of the spotlight 11 as described above and the wall surface 31 is illuminated obliquely downward from above with the spotlight 11: Of the incident light from the light source unit 12 of the spotlight 11, transmitted light (light in the range of “S” in FIG. 15) transmitted through the non-lens area 9 of the light incident surface 2 of the lens plate 1A is the lens plate 1B. In the first embodiment, the transmitted light (light in the range of “T” in FIG. 15) which travels in the direction of the optical axis P without being diffused or converged at this time and transmits the lens area 4 of the light incident surface 2 of the lens plate 1B. It spreads in the same manner as the transmitted light 22 transmitted through the lens area 4 of the lens plate 1A of the form.

  FIG. 16 is an example of a wall surface illuminance distribution map of the spotlight 11 in the case of using the lens plate 1B of the second embodiment. In addition, the wall surface illuminance distribution map of the spotlight 11 in the case where the lens plate 1B is not used is the same as that shown in FIG. 12 described above.

  As apparent from the distribution chart of FIG. 16 and the distribution chart of FIG. 12, the lens plate 1B is disposed in the vicinity of the front of the light source unit 12 of the spotlight 11 as described above. Of the lower side, the brightness (illuminance) on the upper side is made uniform, and the lower side is generally spot-shaped. Therefore, it is possible to secure a sense of brightness on the upper side of the wall surface 31 while illuminating the illumination symmetrical object such as a product placed on the lower side of the wall surface 31 in a spot shape.

  Although some embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.

  In the present invention, the luminaire is not limited to being a spotlight, and may be, for example, a downlight (including a universal downlight). Downlights are usually installed in the ceiling in an embedded manner.

  Furthermore, in the present invention, the lighting fixture is not limited to illuminating the vertical wall surface obliquely downward with respect to the wall surface from the upper side, and, for example, the wall surface from the lower side to the wall surface The illumination may be performed obliquely upward, or the wall may be illuminated from the left to the right with respect to the wall, or the wall may be illuminated from the right to the left with respect to the wall It may be

  Naturally, in the present invention, the light receiving surface is not limited to being a wall surface.

  The present invention is applicable to lens boards for lighting fixtures (eg, spotlights, downlights) and lighting fixtures.

1A, 1B: lens plate 2: light incident surface 3: light output surface 4: lens region 5: concave lens unit 6: first concave portion 7: second concave portion 11: spotlight (lighting instrument)
12: light source part P: optical axis 21 of light source part: incident light 22: transmitted light 31: wall surface (surface to be illuminated)

Claims (9)

A lens plate for a luminaire disposed in front of a light source of the luminaire, the lens plate comprising:
A light incident surface on which light from a light source unit of a lighting fixture is incident is provided, and is disposed in front of the light source unit such that the light incident surface is perpendicular to the optical axis direction of the light source unit. ,
The light incident surface includes a lens area in which a plurality of concave lens units having the same shape and size as viewed in the optical axis direction are arranged in a plurality of rows in a zigzag and in a plane filling shape,
The row direction of the concave lens unit in the light incident plane is the X axis direction of the concave lens unit, the direction orthogonal to the X axis direction in the light incident plane is the Y axis direction of the concave lens unit, and the optical axis direction When the length of the concave lens unit in the Y-axis direction is the width of the concave lens unit,
The concave lens unit is formed in a concave shape for diffusing incident light so that transmitted light spreads on both sides in the X axis direction of the concave lens unit, and both ends in the X axis direction of the concave lens unit in the optical axis direction view Lens plate for lighting fixtures, where the width of the part is wider than the width of the middle part in the X-axis direction.   The concave lens unit is a first concave portion that diffuses incident light so that transmitted light spreads only on both sides in the X axis direction of the concave lens unit, and both sides of the transmitted light in the X axis direction of the concave lens unit and the Y axis direction The lens plate for the luminaire according to claim 1, further comprising: a second concave portion for diffusing incident light so as to spread on one side.   Furthermore, in front of the light source unit of the lighting fixture that illuminates the illuminated surface in the oblique direction with respect to the illuminated surface, the X axis direction of the concave lens unit is parallel to the illuminated surface and the Y axis of the concave lens unit The lens plate for the luminaire according to claim 2, wherein the one side of the direction is disposed to be closer to the light source unit on the surface to be illuminated. The first concave portion is provided on the other side in the Y-axis direction in the concave lens unit,
The lens plate for lighting fixtures according to claim 2 or 3, wherein the second concave portion is provided on the one side in the Y-axis direction in the concave lens unit. The first concave portion is formed of a concave cylindrical surface,
The second concave portion is formed of a concave spherical surface,
The lens plate for the luminaire according to any one of claims 2 to 4, wherein the first concave portion and the second concave portion are smoothly connected to each other.   The lens according to any one of claims 1 to 5, wherein the width of the concave lens unit in the optical axis direction view is substantially enlarged as it proceeds from the X axis direction intermediate portion to the X axis direction both end portions of the concave lens unit. Board.   The lens plate for the luminaire according to any one of claims 1 to 6, wherein the lens area is provided entirely on the light incident surface.   The lens plate for the luminaire according to any one of claims 1 to 6, wherein the lens area is partially provided on the light incident surface. A luminaire including a light source unit, wherein
The lighting fixture provided with the lens board in any one of Claims 1-8 as a lens board arrange | positioned ahead of a light source part.

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