WO2021172268A1

WO2021172268A1 - Light fixture

Info

Publication number: WO2021172268A1
Application number: PCT/JP2021/006613
Authority: WO
Inventors: 拓也市川
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2020-02-26
Filing date: 2021-02-22
Publication date: 2021-09-02
Also published as: JP2021136128A

Abstract

This light fixture (1) is provided with: a light-emitting module (21); and a columnar or planar light guiding body (30) which has an entrance surface (31) for letting light enter and a counter surface (33) for emitting, from an emission surface (32), entered light, and which has formed therein a plurality of prisms (34) for emitting light from the emission surface (32). The counter surface (33) has formed therein the plurality of prisms (34) each having a first surface (34a) that is slanted with respect to the direction of optical axis of the light emitted from the light-emitting module (21) and a second surface (34b) that faces the first surface (34a). When a cross-sectional surface that is orthogonal to the counter surface (33) and made by cutting the light guiding body (30) with a plane parallel to the optical axis direction is viewed, a first angle of the first surface (34a) with respect to the optical axis direction is defined as (θ1), a second angle of the second surface (34b) is defined as (θ2), the distance between two adjacent prisms (34) among the plurality of the prisms (34) is defined as (L1), and the width of the plurality of prisms (34) along the optical axis direction is defined as (L2).

Description

lighting equipment

This disclosure relates to lighting equipment.

Patent Document 1 discloses a surface light source device including a light source and a light guide plate on which light emitted from the light source is incident from an end surface and an exit surface is formed to emit light incident from the end surface. .. A plurality of prisms having different apex angles are provided on the reflecting surface on the opposite side to the emitting surface so as to extend in a direction orthogonal to the end surface.

Japanese Unexamined Patent Publication No. 2005-85671

In the lighting fixture as the surface light source device of the above-mentioned prior art, the light emitted from the light source is incident on the incident surface which is the end surface, and the light incident on the incident surface is formed on the light extraction surface as the reflecting surface. The light is emitted from the exit surface. In this case, simply forming a plurality of prisms increases the amount of light leaking from the reflecting surface. Therefore, it is required to suppress the leaked light on the light extraction surface.

Therefore, an object of the present disclosure is to provide a lighting fixture capable of suppressing light leakage from a plurality of prisms of a light guide body.

In order to achieve the above object, the lighting fixture according to one aspect of the present disclosure includes a light source, an incident surface on which light emitted from the light source is incident, and light extraction for emitting light incident from the incident surface from an emitting surface. A columnar or plate-shaped light guide body having a surface and forming a plurality of prisms for emitting light from the emission surface is provided, and an optical axis of light emitted by the light source is provided on the light extraction surface. The plurality of prisms having a first surface inclined with respect to a direction and a second surface facing the first surface are formed, and a plane orthogonal to the light extraction surface and parallel to the optical axis direction. When the cross section obtained by cutting the light guide body is viewed, the first angle of the first surface with respect to the optical axis direction is set to θ1, the second angle of the second surface with respect to the optical axis direction is set to θ2, and the plurality of said. Assuming that the distance between two adjacent prisms among the prisms is L1 and the widths of the plurality of prisms along the optical axis direction are L2, the following equations (1) to (3) are established.

0 <L2 ≤ 0.5 × L1 equation (1)
25 ° ≤ θ1 ≤ 58 ° Equation (2)
0 <θ1 + 10 ° <θ2 ≦ 90 ° Equation (3)

The lighting fixture according to the present disclosure can suppress light leakage from a plurality of prisms of the light guide body.

FIG. 1 is a perspective view illustrating the lighting fixture according to the first embodiment. FIG. 2 is a cross-sectional view illustrating the lighting fixture according to the first embodiment and a partially enlarged cross-sectional view showing a prism of the light guide body. FIG. 3 is a partially enlarged cross-sectional view showing the prism of the light guide body of the lighting fixture according to the first embodiment in more detail. FIG. 4 is a diagram showing the relationship between the prism spacing (mm) and the light emission rate (%) of the light emitted from the prism when the second angle θ2 is changed with respect to the first angle θ1. FIG. 5 shows a light distribution curve of the light emitted from the light guide when the width L2 is changed with respect to the distance L1 when the first angle θ1 is 54 ° and the second angle θ2 is also 54 °. Is shown. FIG. 6A shows a light distribution curve of light emitted from the light guide when the width L2 is changed with respect to the distance L1 when the first angle θ1 is 54 ° and the second angle θ2 is 90 °. Is shown. FIG. 6B shows FIG. 6A emitted from the light guide when the width L2 is changed with respect to the distance L1 when the first angle θ1 is 54 ° and the second angle θ2 is 90 °. The light distribution curve of another light is shown. FIG. 7 is a side view illustrating the lighting fixture according to the second embodiment. FIG. 8 is a cross-sectional view illustrating the lighting fixture according to the line VIII-VIII of FIG. FIG. 9 is a perspective view illustrating a lighting state of the lighting fixture according to the second embodiment. FIG. 10 is a cross-sectional view illustrating an optical path of light emitted by the lighting fixture according to the third embodiment. FIG. 11 is a perspective view illustrating another lighting fixture according to a modified example.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Each of the embodiments described below is a specific example of the present disclosure. Therefore, the numerical values, shapes, materials, components, arrangement positions of the components, connection forms, etc. shown in the following embodiments are examples and are not intended to limit the present disclosure. Therefore, among the components in the following embodiments, the components not described in the independent claims are described as arbitrary components.

Note that each figure is a schematic view and is not necessarily exactly illustrated. Further, in each figure, substantially the same configuration is designated by the same reference numerals, and duplicate description will be omitted or simplified.

Further, in the following embodiments, expressions such as substantially parallel are used. For example, substantially parallel means not only that they are parallel, but also that they are substantially parallel, that is, they include an error of, for example, about several percent. Further, substantially parallel means parallel to the extent that the effects of the present disclosure can be achieved. The same applies to expressions using other "abbreviations".

In the following description, in FIG. 1, the direction parallel to the optical axis direction of the light emitted by the light emitting module is defined as the X-axis direction, and the direction parallel to the longitudinal direction, which is the length direction of the prism (direction orthogonal to the optical axis direction). ) Is the Y-axis direction, and the X-axis direction and the direction orthogonal to the Y-axis direction are defined as the Z-axis direction. The light guide body side with respect to the housing is the X-axis plus direction, one side of the light guide body prism length direction is the Y-axis plus direction, and the depth direction of the light guide prism is the Z-axis plus direction. The same applies to FIGS. 2 and later.

Hereinafter, the lighting fixture according to the embodiment of the present disclosure will be described.

(Embodiment 1)
<Structure: Lighting equipment 1>
FIG. 1 is a perspective view illustrating the lighting fixture 1 according to the first embodiment.

As shown in FIG. 1, the luminaire 1 is a luminaire using a columnar or plate-shaped light guide body 30, and is installed on a construction material such as a ceiling or a wall, for example. The lighting fixture 1 of the present embodiment may be arranged on a table such as a desk. The lighting fixture 1 can illuminate a space by irradiating the surroundings with light. The lighting fixture 1 of the present embodiment mainly illuminates the surroundings by emitting light in a direction intersecting the length direction of the light guide body 30. The lighting fixture 1 of the present embodiment is an edge light type light guide 30.

FIG. 2 is a cross-sectional view illustrating the lighting fixture 1 according to the first embodiment and a partially enlarged cross-sectional view showing the prism 34 of the light guide body 30.

As shown in FIG. 2, the luminaire 1 includes a housing 10, a light emitting module 21, a light guide body 30, and a power supply circuit 40.

[Case 10]
The housing 10 is a housing body that is long in the Y-axis direction, and houses the light guide body 30, the light emitting module 21, and the power supply circuit 40. The housing 10 is in a posture in which the light emitted by the light emitting module 21 is incident on the light guide 30 with the light emitting module 21 and the light guide 30 housed therein, and the light is emitted from the emission surface 32 of the light guide 30. The light emitting module 21 and the light guide body 30 are held in a posture of emitting light.

The housing 10 is made of a metal material such as aluminum. Therefore, the housing 10 has a light-shielding property. The housing 10 may be made of a material such as resin.

The housing 10 has an opening in which the portion on the plus direction side of the X axis is opened. The housing 10 forms a space for accommodating the end portion of the light guide body 30 on the negative direction side of the X axis through the opening, and supports the light guide body 30 in a posture substantially parallel to the XY plane. Specifically, the housing 10 is provided on the X-axis minus direction side of the light guide body 30, and supports the light guide body 30 in a state where the exit surface 32 and the facing surface 33 of the light guide body 30 are exposed. ..

[Light emitting module 21]
The light emitting module 21 is housed in the housing 10 and supported by the housing 10. The light emitting module 21 is supported in a posture of emitting light to the light guide body 30. That is, the light emitting module 21 is supported by the housing 10 in a posture in which the light emitting surface of the light emitting module 21 faces the light guide body 30 and the optical axis of the light emitting module 21 intersects the light guide body 30. In the present embodiment, the light emitting module 21 is arranged in the housing 10 so that the optical axis substantially coincides with the central axis O of the incident surface 31 of the light guide body 30. Here, the optical axis is a straight line that substantially coincides with the emission direction of the main light emitted by the light emitting module 21. The light emitting module 21 is an example of a light source.

The light emitting module 21 has, for example, an SMD (Surface Mount Device) type LED (Light Emitting Diode) element. That is, the light emitting module 21 has a light emitting element which is an LED chip and a phosphor which emits fluorescence by wavelength-converting the light emitted by each of the light emitting elements. The light emitting element may be a COB (Chip On Board) type light emitting module. The light emitting element may be an example of a light source.

Each of the light emitting elements is an LED chip arranged in a resin-molded cavity, and emits light that becomes the light emitted from the lighting fixture 1. Each of the light emitting elements is enclosed in a cavity by a resin containing a phosphor. That is, the SMD type LED element is a package type LED element in which each of the light emitting elements is sealed with this resin.

The light emitting module 21 may be electrically connected to the power supply circuit 40 and supplied with power from the power supply circuit 40. Further, the lighting fixture 1 may include a power supply circuit 40. The light emitting module 21 may be turned on and off by being controlled by a control unit (not shown) provided in the power supply circuit 40. The light emitting module 21 may be controlled by a control unit provided in the power supply circuit 40 to perform dimming and toning. For example, the light emitting module 21 may employ a surface mount type LED element that emits white light by combining a blue LED chip and a yellow phosphor-containing resin.

Further, the light emitting module 21 is mounted on a substrate on which a pair of electrode terminals (positive electrode terminal and negative electrode terminal) for receiving DC power for causing the light emitting module 21 to emit light from the outside are formed. In the present embodiment, a plurality of light emitting modules 21 are provided, and the plurality of light emitting modules 21 are mounted on the substrate so as to be arranged at equal intervals in the Y-axis direction.

[Light guide body 30]
The light guide body 30 has a columnar or plate shape in which a plurality of prisms 34 for guiding the light emitted by the light emitting module 21 and emitting the light from the emission surface 32 are formed. In the present embodiment, the light guide body 30 is a light transparent plate having translucency and substantially parallel to the XY plane. The light guide body 30 is supported by the housing 10 by inserting the end portion on the minus direction side of the X axis into the opening of the housing 10 so as to cover the opening of the housing 10. When supported by the housing 10, the central axis O of the light guide body 30 in the length direction substantially coincides with the optical axis of the light emitting module 21.

The light guide body 30 has an incident surface 31, an exit surface 32, and a facing surface 33.

The incident surface 31 is a surface on which the light emitted by the plurality of light emitting modules 21 is incident, and is a surface facing the plurality of light emitting modules 21. The incident surface 31 is a surface connected to the edge of the exit surface 32 and the edge of the facing surface 33, and is a side surface of the light guide body 30 on the minus direction side of the X axis. The incident surface 31 is a plane substantially parallel to the YY plane, and forms a substantially uniform plane.

The exit surface 32 is a surface that emits light incident from the incident surface 31, that is, light that guides the light guide body 30, and is a light emission surface for irradiating the irradiation surface with light. For example, the exit surface 32 emits the light reflected by the facing surface 33. The exit surface 32 is a surface of the light guide body 30 on the Z-axis plus direction side. The exit surface 32 is a plane along the length direction of the light guide body 30, which is substantially parallel to the XY plane.

The facing surface 33 is a light extraction surface for emitting light incident from the incident surface 31. The facing surface 33 is a surface facing the exit surface 32, that is, a surface opposite to the exit surface 32, and reflects the light guided by the light guide body 30 toward the exit surface 32. The facing surface 33 is a surface of the light guide body 30 on the negative direction side of the Z axis. The facing surface 33 is a surface substantially parallel to the XY plane.

FIG. 3 is a partially enlarged cross-sectional view showing the prism 34 of the light guide body 30 of the lighting fixture 1 according to the first embodiment in more detail.

As shown in FIGS. 2 and 3, a plurality of prisms 34 are formed on the facing surface 33. The facing surface 33 is formed in a saw shape by a plurality of prisms 34 when the cross section of the light guide body 30 cut in the ZX plane is viewed.

Each of the plurality of prisms 34 has a first surface 34a that is inclined with respect to the optical axis direction of the light emitted by the light emitting module 21, and a second surface 34b that faces the first surface 34a. The first surface 34a is an inclined surface facing the light emitting module 21 side and intersects the optical axis direction. The second surface 34b is a surface (or a surface opposite to the first surface 34a) of each of the plurality of prisms 34.

Each of the plurality of prisms 34 is a long groove along the Y-axis direction and is orthogonal to the optical axis direction. When the cross section of the light guide body 30 cut in a plane orthogonal to the facing surface 33 and parallel to the optical axis direction is viewed, the first angle of the first surface 34a with respect to the optical axis direction is set to θ1 with respect to the optical axis direction. The second angle of the second surface 34b is θ2, the distance between two adjacent prisms 34 among the plurality of prisms 34 (the width of the opening of the prisms 34) is L1, and the directions of each of the plurality of prisms 34 are in the optical axis direction. Assuming that the width along the line (the width of two adjacent prisms 34) is L2, the following equations (1) to (3) are established.

<Power supply circuit 40>
As shown in FIG. 2, the power supply circuit 40 is housed in the housing 10 and controls lighting to turn on and off the light emitting module 21. The power supply circuit 40 is a lighting circuit in which a plurality of electronic components are mounted on a substrate. The power supply circuit 40 generates driving power for causing the plurality of light emitting modules 21 to emit light. For example, the power supply circuit 40 has an AC / DC converter and the like. The power supply circuit 40 converts the AC power supplied from the commercial power source into DC power, and supplies the converted DC power to the light emitting module 21. As a result, the light emitting module 21 emits light.

Further, the power supply circuit 40 is arranged vertically above the light emitting module 21. That is, the power supply circuit 40 is housed in the housing 10 and is arranged on the X-axis minus direction side of the light guide body 30 and the light emitting module 21. The power supply circuit 40 is arranged, for example, in the vicinity of the construction material of the housing 10.

The power supply circuit 40 may be mounted on the surface opposite to the mounting surface of the board on which the plurality of light emitting modules 21 are mounted.

<Experimental results>
FIG. 4 is a diagram showing the relationship between the prism spacing (mm) and the light emission rate (%) of the light emitted from the prism when the second angle θ2 is changed with respect to the first angle θ1.

As shown in FIGS. 3 and 4, the horizontal axis represents the prism spacing (mm), which is the sum of the distance L1 between two adjacent prisms and the width L2 along the optical axis direction of the prisms, and the vertical axis represents the prism spacing (mm). , Indicates the light emission rate (%) of the light emitted from the prism. In FIG. 4, when the first angle θ1 is 54 °, the second angle θ2 is changed to 90 °, 85 °, 80 °, 75 °, 70 °, 65 °, and 54 °. In this case, the first angle θ1 is 54 °, the light emission rate is the lowest when the second angle θ2 is 90 °, and the second angle θ2 becomes smaller (or the second angle θ2 approaches the first angle θ1). The rate has risen.

Therefore, the second angle θ2 is set to be larger than the first angle θ1 and is set to 90 ° or less.

The first angle θ1 is 25 ° or more and 58 ° or less, but if the first angle θ1 is less than 25 °, the distance L1 becomes large and the light to be guided is reflected by the first surface of the prism. Further, reflection on the exit surface facilitates emission from the first surface. Further, if the first angle θ1 is larger than 58 °, the distance L1 becomes smaller, but the light that guides the light easily travels straight through the prism or is reflected by the second surface, so that the first surface is the exit surface. It becomes difficult to reflect toward.

Further, the lowest light emission rate, the first angle θ1 is 54 ° and the second angle θ2 is 90 °, and the highest light emission rate, the first angle θ1 is 54 ° and the second angle θ2 is also 54. The light distribution distributed by the light guide was measured at °.

FIG. 5 shows a light distribution curve of the light emitted from the light guide when the width L2 is changed with respect to the distance L1 when the first angle θ1 is 54 ° and the second angle θ2 is also 54 °. Is shown. A in FIG. 5 is a light distribution curve when L1 = 300 (μm) and L2 = 700 (μm), and b in FIG. 5 is L1 = 300 (μm) and L2 = 50 (μm). ) Is the light distribution curve. In both cases of a in FIG. 5 and b in FIG. 5, there is leakage light equivalent to the amount of control light. However, it was found that the smaller L2 is, the more the leaked light is suppressed.

Therefore, FIG. 6A shows the arrangement of the light emitted from the light guide when the width L2 is changed with respect to the distance L1 when the first angle θ1 is 54 ° and the second angle θ2 is 90 °. Shows the light curve. FIG. 6B shows FIG. 6A emitted from the light guide when the width L2 is changed with respect to the distance L1 when the first angle θ1 is 54 ° and the second angle θ2 is 90 °. The light distribution curve of another light is shown.

A in FIG. 6A is a light distribution curve when L1 = 300 (μm) and L2 = 50 (μm), and b in FIG. 6A is L1 = 300 (μm) and L2 = 200 (μm). ), C in FIG. 6A is the light distribution curve in the case of L1 = 300 (μm) and L2 = 300 (μm), and d in FIG. 6B is L1 = 300 (μm). It is a light distribution curve when L2 = 700 (μm), and e in FIG. 6B is a light distribution curve when L1 = 300 (μm) and L2 = 1700 (μm). Also in FIGS. 6A and 6A, it was found that the smaller the width L2, the more the leaked light was suppressed. Further, since the leaked light does not appear in the a of FIG. 6A and the leaked light appears in the b of FIG. 6A, the width L2 is set to half or less of the distance L1 with the a of FIG. 6A and the b of FIG. 6A as the boundary. ..

Therefore, the width L2 in the lateral direction is preferably 1/6 of the distance L1 between the two adjacent prisms 34.

<Operation>
In the present embodiment, as shown in FIGS. 2 and 3, the light emitted by the light emitting module 21 is incident on the incident surface 31 to guide the light guide body 30. The light to be guided is incident on the first prism 34 of the plurality of prisms 34 on the facing surface 33, emitted from the first surface 34a, and further incident on the second surface 34b facing the first surface 34a. The light guide body 30 is guided. The light to be guided is incident on the second prism 34 adjacent to the first prism 34. Since the light incident on the second prism 34 travels along the optical axis direction of the light emitting module 21, it is incident on the first surface 34a, reflected, and guided to the exit surface 32. The light guided to the exit surface 32 is emitted from the exit surface 32 as control light whose light distribution is controlled.

<Effect>
Next, the action and effect of the lighting fixture 1 in the present embodiment will be described.

As described above, the lighting fixture 1 of the present embodiment is for emitting the light incident from the light emitting module 21, the incident surface 31 on which the light emitted by the light emitting module 21 is incident, and the light incident from the incident surface 31 from the emitting surface 32. A columnar or plate-shaped light guide body 30 having a facing surface 33 and a plurality of prisms 34 for emitting light from the emitting surface 32 is provided. On the facing surface 33, a plurality of prisms 34 having a first surface 34a inclined with respect to the optical axis direction of the light emitted by the light emitting module 21 and a second surface 34b facing the first surface 34a are formed. When the cross section of the light guide body 30 cut in a plane orthogonal to the facing surface 33 and parallel to the optical axis direction is viewed, the first angle of the first surface 34a with respect to the optical axis direction is set to θ1 with respect to the optical axis direction. Assuming that the second angle of the second surface 34b is θ2, the distance between two adjacent prisms 34 among the plurality of prisms 34 is L1, and the width of the plurality of prisms 34 along the optical axis direction is L2, the following Equations (4) to (6) hold.

0 <L2 ≤ 0.5 × L1 equation (4)
25 ° ≤ θ1 ≤ 58 ° Equation (5)
0 <θ1 + 10 ° <θ2 ≦ 90 ° Equation (6)

According to this, when the conditions of the equations (4) to (6) are satisfied, the light emitted by the light emitting module 21 is incident on the prism 34, and even if it is emitted from the first surface 34a, it is guided to the second surface 34b. It becomes easy to get rid of. The light guided and guided by the second surface 34b is reflected by the first surface 34a and is easily guided to the exit surface 32.

Therefore, in this luminaire 1, the light leakage from the plurality of prisms 34 of the light guide body 30 can be suppressed.

Further, in the lighting fixture 1 of the present embodiment, the width L2 is 1/6 of the distance L1 of two adjacent prisms 34.

According to this, since the width L2 can be made smaller, the distance between two adjacent prisms 34 can be made smaller. Therefore, in the lighting fixture 1, the light leakage from the plurality of prisms 34 of the light guide body 30 can be further suppressed.

Further, in the lighting fixture 1 of the present embodiment, the first surface 34a is an inclined surface facing the light emitting module 21 side. The second surface 34b is the surface of the prism 34 opposite to the first surface 34a.

According to this, the light that guides the light guide body 30 along the optical axis direction is emitted from the first surface 34a of the first prism 34 and easily incident on the second surface 34b. Therefore, it is easily reflected by the first surface 34a of the second prism 34 adjacent to the first prism 34 via the second surface 34b of the first prism 34. Therefore, in the lighting fixture 1, the light leakage from the plurality of prisms 34 of the light guide body 30 can be suppressed more reliably.

Further, in the luminaire 1 of the present embodiment, each of the plurality of prisms 34 is a long groove extending in a direction orthogonal to the optical axis direction.

According to this, since the light incident on the incident surface 31 of the light guide body 30 can be efficiently guided to the exit surface 32, the lighting fixture 1 can perform desired light distribution control and can also perform desired light distribution control. Leakage light from the plurality of prisms 34 of the light guide body 30 can be suppressed more reliably.

(Embodiment 2)
<Structure: Lighting fixture 1a>
FIG. 7 is a side view illustrating the lighting fixture 1a according to the second embodiment.

This embodiment differs from the lighting fixture of the first embodiment in that a square columnar light guide 100 is used instead of the plate-shaped light guide. Unless otherwise specified, other configurations in the present embodiment are the same as those in the first embodiment, and the same configurations are designated by the same reference numerals and detailed description of the configurations will be omitted.

As shown in FIG. 7, the luminaire 1a includes a reflector 150 and a wavelength control member 160 of FIG. 8 in addition to the light emitting module 121 and the light guide body 100.

[Reflector 150]
FIG. 8 is a cross-sectional view illustrating the luminaire 1a according to the line VIII-VIII of FIG. 8a is a cross-sectional view illustrating the lighting fixture 1a before changing the distance to the light emitting module 121, and FIG. 8b is a cross-sectional view illustrating the lighting fixture 1a after changing the distance to the light emitting module 121. be.

As shown in FIGS. 7 and 8, the reflector 150 is arranged at the end of the light guide body 100 and has a tubular shape capable of guiding the light emitted by the light emitting module 121 to the incident surface 131. Specifically, the reflector 150 has a bottomed tubular shape, and accommodates the wavelength control member 160 and the light emitting module 121 in the internal space K. In the reflector 150, the end edge on the Z-axis plus direction side on one end side opens, and the end edge on the Z-axis minus direction side on the other end side closes.

Further, the inner surface of the reflector 150 is a reflecting surface that reflects the light emitted by the light emitting module 121. That is, the light emitted by the light emitting module 121 is mirror-finished in order to be efficiently incident on the light guide body 100. The reflector 150 may be, for example, a metal such as aluminum, a white resin, or the like.

The reflector 150 supports the light emitting module 121 arranged at the bottom, which is the edge on the negative direction side of the Z axis, so as to face the light guide body 100. Further, the reflector 150 supports the light guide body 100 in a posture in which the incident surface 131 of the light guide body 100 and the light emitting module 121 face each other. The light guide body 100 is inserted into the opening 153 on the Z-axis plus direction side at one end side of the reflector 150, and the reflector 150 supports the light guide body 100 in an upright posture.

In the present embodiment, the reflector 150 is formed with a step portion 152 on the inner surface that supports the light guide body 100 inserted into the opening 153. The step portion 152 is an annular groove portion that supports the light guide body 100 in an upright posture by contacting the end surface of the light guide body 100 on the incident surface 131 side. That is, the step portion 152 has a role of aligning the incident surface 131 of the light guide body 100 with respect to the optical axis of the light emitting module 121 and holding the posture of the light guide body 100. Further, by arranging the ring-shaped spacer 45 on the step portion 152, the distance between the light emitting surface of the light emitting module 121 and the incident surface 131 of the light guide body 100 can be changed.

The light guide body 100 may be fixed to the reflector 150 by a screw or the like attached around the reflector 150, and the means for maintaining the posture of the light guide body 100 with respect to the reflector 150 is described in the present embodiment. Not limited. Also in this case, the distance between the light emitting surface of the light emitting module 121 and the incident surface 131 of the light guide body 100 can be changed by tightening the screws.

Further, the reflector 150 has a square tubular shape in the present embodiment, but may have a polygonal tubular shape, a cylindrical shape, a semi-cylindrical shape, or the like. The shape of the reflector 150 may be appropriately set according to the shape of the light guide body 100, that is, the cross-sectional shape of the light guide body 100 in the length direction.

[Light emitting module 121]
The light emitting module 121 is housed in the reflector 150 and is arranged at the bottom of the reflector 150. The light emitting module 121 is held at the bottom of the reflector 150 in a posture of emitting light to the light guide body 100. That is, the light emitting module 121 is held by the reflector 150 in a posture in which the light emitting surface of the light emitting module 121 faces the light guide body 100 and the optical axis of the light emitting module 121 intersects the light guide body 100. In the present embodiment, the light emitting module 121 is arranged inside the reflector 150 so that the optical axis substantially coincides with the central axis O of the reflector 150. Here, the optical axis is a straight line that substantially coincides with the emission direction of the main light emitted by the light emitting module 121.

A part of the first color light emitted by the light emitting module 121 is incident on the incident surface 131 without passing through the wavelength control member 160. Further, another part of the light of the first color emitted by the light emitting module 121 is incident on the incident surface 131 by controlling the wavelength of the light of the first color to the light of the second color via the wavelength control member 160.

[Wavelength control member 160]
The wavelength control member 160 may be a wavelength conversion member that converts the light of the first color into the light of the second color by converting the light emitted by the light emitting module 121 into wavelength. The wavelength control member 160 includes a phosphor that emits wavelength-converted light upon irradiation with light, and the phosphor is dispersed and held in a binder that is a transparent material made of ceramic such as glass or silicone resin. The wavelength control member 160 is, for example, a YAG (Ytrium Aluminum Garnet) -based phosphor, a Cousin-based phosphor, an escalated-based phosphor, a BAM (Ba, Mg, Al) -based phosphor, or the like, and is an emission surface 132 of the light guide body 100. It can be appropriately selected according to the color of the light emitted from.

Further, the wavelength control member 160 may be an optical thin film (color filter) using a dielectric multilayer film. The wavelength control member 160 absorbs a part of the light emitted by the light emitting module 121 and reflects the other light. The wavelength control member 160 can be appropriately selected according to the color of the light emitted from the exit surface 132 of the light guide body 100 in order to reflect the light having a predetermined wavelength among the light emitted by the light emitting module 121.

The wavelength control member 160 is arranged along the inner surface of the reflector 150. Specifically, the wavelength control member 160 is laminated on the inner surface of the reflector 150 and covers the inner surface of the reflector 150. The wavelength control member 160 is arranged in a square cylinder in the reflector 150, and forms a space K between the light emitting module 121 and the incident surface 131 through which the light emitted by the light emitting module 121 passes. As a result, when the wavelength control member 160 reflects a part of the light emitted by the light emitting module 121, the wavelength control member 160 emits light of a predetermined color according to the property of the wavelength control member 160.

[Light guide body 100]
The light guide body 100 has a columnar or plate shape in which a plurality of prisms 134 for guiding the light emitted by the light emitting module 121 and emitting the light from the emission surface 132 are formed. In the present embodiment, the light guide body 100 is a light-transmitting member having a light-transmitting property and having a long square columnar shape in the Z-axis direction. The light guide body 100 may be polygonal, columnar, semi-cylindrical, or the like.

The light guide body 100 is supported by the reflector 150 by inserting the end portion on the negative side of the Z axis into the opening 153 of the reflector 150 so as to cover the opening 153 of the reflector 150. When supported by the reflector 150, the central axis O of the light guide body 100 in the length direction substantially coincides with the optical axis of the light emitting module 121.

The light guide body 100 has an incident surface 131, an exit surface 132, and a facing surface 133.

The incident surface 131 is a surface on which the light emitted by the light emitting module 121 is incident, and is a surface facing the light emitting surface of the light emitting module 121. That is, the incident surface 131 is an end surface of the light guide body 100 on the negative direction side of the Z axis. The normal at the center of the incident surface 131 substantially coincides with the optical axis of the light emitting module 121.

Light of the first color and light of the second color are incident on the incident surface 131.

The light of the first color is the light emitted by the light emitting module 121, and is the light incident on the incident surface 131 without passing through the reflector 150. The light incident on the incident surface 131 without passing through the reflector 150 is the light emitted by the light emitting module 121 without being reflected by the wavelength control member 160 of the reflector 150 and directly incident on the incident surface 131. be. The light of the second color is the light emitted by the light emitting module 121, which is different from the light of the first color incident on the incident surface 131 via the reflector 150. The second color is a color different from the first color. That is, the wavelength of the light of the second color is different from the wavelength of the light of the first color. The light incident on the incident surface 131 via the reflector 150 is wavelength-controlled from the first color to the second color by reflecting the light emitted by the light emitting module 121 by the wavelength control member 160 of the reflector 150. Later, it is the light indirectly incident on the incident surface 131.

The exit surface 132 is a surface that emits light incident from the incident surface 131, and is a surface opposite to the facing surface 133.

A plurality of prisms 134 for emitting light are formed on the facing surface 133.

The plurality of prisms 134 are formed on the facing surface 133 along the length direction of the light guide body 100, and are opposite surfaces (opposing surfaces) to the facing surface 133 in the length direction (Z-axis direction) and line symmetry. ) Is not formed. More specifically, the plurality of prisms 134 are not formed on a surface (exit surface 132 in the present embodiment) that is parallel to the facing surface 133 and is plane-symmetrical with the plane including the central axis O.

The light incident on the prism 134 formed on the facing surface 133 is guided to the exit surface 132 on the opposite side via the prism 134 and is emitted from the exit surface 132. Each of the plurality of prisms 134 is a cone-shaped, frustum-shaped, or elongated groove-shaped convex or concave portion. Each of the plurality of prisms 134 of the present embodiment is a long groove formed along the length direction of the light guide body 100, but may be, for example, a conical recess.

A plurality of prisms 134 may also be formed on the side surface of the light guide body 100 along the Z-axis direction (the surface between the exit surface 132 and the facing surface 133).

FIG. 9 is a perspective view illustrating a lighting state of the lighting fixture 1a according to the second embodiment. FIG. 9a is a perspective view illustrating a lighting state of the lighting fixture 1a before changing the distance to the light emitting module 121, and FIG. 9b is a lighting state of the lighting fixture 1a after changing the distance to the light emitting module 121. It is a perspective view which illustrates.

As shown in FIG. 9, the exit surface 132 emits the light of the first color from the first region R1 and the light of the second color from the second region R2 different from the first region R1. The sizes of the first region R1 and the second region R2 change according to the distance between the light emitting surface of the light emitting module 121 and the incident surface 131. For example, when the incident surface 131 is brought closer to the light emitting module 121, the first region R1 gradually moves in the Z-axis plus direction, and the second region R2 also moves in the Z-axis plus direction. Further, as the incident surface 131 is moved away from the light emitting module 121, the first region R1 gradually moves in the Z-axis minus direction, and the second region R2 also moves in the Z-axis minus direction.

<Operation>
In the present embodiment, as shown in FIGS. 8 and 9, a wavelength conversion member having a red phosphor is used as the wavelength control member 160. The wavelength control member 160 converts the white light emitted by the light emitting module 121 into red light. In such a lighting fixture 1a, as shown in FIG. 9, when the light emitting module 121 emits white light, a part of the white light is incident on the incident surface 131 of the light guide body 100 without passing through the wavelength control member 160. Then, the light guide body 100 is guided. Since the angle of the light emitted by the light emitting module 121 with respect to the optical axis is small, the white light reaches the end side of the light guide body 100 on the Z-axis plus direction side. As a result, white light is emitted from the first region R1 of the exit surface 132 of the light guide body 100.

Further, another part of the white light is wavelength-converted to red light by incident on the wavelength control member 160, and the red light is reflected. Then, the wavelength-converted red light is incident on the incident surface 131 of the light guide body 100 to guide the light guide body 100. Since the red light has a larger angle with respect to the optical axis of the light emitted by the light emitting module 121 than the white light, the Z-axis minus of the light guide body 100 is reached by the time it reaches the end of the light guide body 100 on the Z-axis plus direction side. Light is emitted from the end side on the directional side. As a result, red light is emitted from the second region R2 of the exit surface 132 of the light guide body 100.

<Effect>
Next, the action and effect of the lighting fixture 1a in the present embodiment will be described.

As described above, in the lighting fixture 1a of the present embodiment, the light guide body 100 is columnar. The plurality of prisms 134 are formed on the facing surface 133 along the length direction of the light guide body 100, and are formed on the surface opposite to the facing surface 133 in the length direction (Z-axis direction) and line symmetry. No.

According to this, it is possible to prevent the light reflected by the plurality of prisms 134 from being reflected by the plurality of prisms 134 arranged on the opposite side. Therefore, in the luminaire 1a, the light reflected by the plurality of prisms 134 can be reliably emitted from the emission surface 32.

Also in this embodiment, the same effects as those in the above-described first embodiment are obtained.

(Embodiment 3)
The lighting fixture 1b of the present embodiment will be described.

The present embodiment is different from the lighting fixture of the first embodiment in that the light emitting module 121 includes the first light emitting module 121a, the second light emitting module 121b, and the third light emitting module 121c. Further, it is different from the lighting fixture of the first embodiment in that a plurality of prisms 134 are formed on both sides of the light guide body 101. Unless otherwise specified, other configurations in the present embodiment are the same as those in the first embodiment, and the same configurations are designated by the same reference numerals and detailed description of the configurations will be omitted.

FIG. 10 is a cross-sectional view illustrating an optical path of light emitted by the lighting fixture 1b according to the third embodiment.

In the present embodiment, as shown in FIG. 10, the reflector 150 accommodates one or more first light emitting modules 121a, one or more second light emitting modules 121b, and one or more third light emitting modules 121c.

[Light emitting module 121]
The light emitting module 121 includes one or more first light emitting modules 121a that emit light of the first color, one or more second light emitting modules 121b that emit light of the second color, and one or more first light emitting modules that emit light of the third color. 3 Includes a light emitting module 121c.

Specifically, one or more first light emitting modules 121a are arranged on or near the central axis O of the reflector 150, and one or more second light emitting modules 121b are around one or more first light emitting modules 121a. The one or more third light emitting modules 121c are arranged so as to surround the outer periphery of the one or more second light emitting modules 121b. That is, one or more second light emitting modules 121b and one or more third light emitting modules 121c are arranged concentrically around a set of one or more first light emitting modules 121a.

The first light emitting module 121a has a first lens 121c1 that covers the cavity. The first lens 121c1 controls the light distribution so that the light emitted by the first light emitting module 121a is incident on the incident surface 131 of the light guide body 101 without passing through the reflector 150. That is, the optical axis of the light emitted by the first light emitting module 121a intersects the incident surface 131.

The second light emitting module 121b has a second lens 121c2 that covers the cavity. The second lens 121c2 controls the light distribution so that the light emitted by the second light emitting module 121b is incident on the incident surface 131 of the light guide body 101 via the reflector 150. The optical axis of the light emitted by the second light emitting module 121b intersects the inner surface of the reflector 150.

The third light emitting module 121c has a third lens 121c3 that covers the cavity. The third lens 121c3 controls the light distribution so that the light emitted by the third light emitting module 121c is incident on the incident surface 131 of the light guide body 101 via the reflector 150. The optical axis of the light emitted by the third light emitting module 121c intersects the inner surface of the reflector 150. The intersection of the optical axis of the third color light emitted by the third light emitting module 121c and the inner surface of the reflector 150 is the intersection of the optical axis of the second color light emitted by the second light emitting module 121b and the inner surface of the reflector 150. It is located closer to the light emitting module 121 than the intersection.

[Light guide body 101]
The light guide body 101 has an incident surface 131, one surface 141, and the other surface 142.

The incident surface 131 is an end surface between the one surface 141 and the other surface 142 on the negative direction side of the Z axis, and is a surface facing the light emitting surface of the light emitting module 121.

One surface 141 is a surface that emits light incident from the incident surface 131, and is a surface opposite to the other surface 142. On the other hand, the surface 141 is a surface extending along the Z-axis direction. In the present embodiment, since the light guide body 101 has a square columnar shape, one surface 141 is a flat surface, but it may be an arcuate curved surface depending on the shape of the light guide body 101.

The other surface 142 is a surface that emits light incident from the incident surface 131, and is a surface opposite to the one surface 142. The other surface 142 is a surface extending along the Z-axis direction. In the present embodiment, since the light guide body 101 has a square columnar shape, the other surface 142 is a flat surface, but it may be an arcuate curved surface depending on the shape of the light guide body 101.

One surface 141 has a light extraction surface 141a on which a plurality of prisms 134 are formed, and one or more emission surfaces 141b adjacent to the light extraction surface 141a. Further, on the other surface 142, the light extraction surface 142a formed on the surface of the one surface 141 opposite to the emission surface 141b and the emission surface 142b formed on the surface of the one surface 141 opposite to the light extraction surface 141a. And have. That is, when viewed in the cross section of the light guide body 101 of FIG. 10, the light extraction surface 141a and the light extraction surface 142b are arranged line-symmetrically with respect to the central axis O, and the emission surface 141b and the light extraction surface 142a are centered. It is arranged line-symmetrically on the axis O.

A plurality of light extraction surfaces 141a and exit surfaces 141b may be formed on one surface 141. Further, a plurality of light extraction surfaces 142a and emission surfaces 142b may be formed on the other surface 142 as well.

The action and effect in the present embodiment have the same action and effect as those in the above-described first embodiment and the like.

(Other variants)
The lighting fixtures according to the present disclosure have been described above based on the first to third embodiments, but the present disclosure is not limited to the first to third embodiments described above.

For example, in the lighting fixture according to the third embodiment, the reflector may not be provided with a wavelength conversion member.

Further, the light guide body of the lighting equipment according to the third embodiment may be applied to other embodiments 1 and 2, and the light guide body of the first and second embodiments is the light guide body of the third embodiment. It may be applied to a light guide body.

Further, in the lighting fixture 1c according to the third embodiment, as shown in FIG. 11, all the side surfaces 160 along the Z-axis direction of the light guide body 102 (that is, the circumferential direction of the central axis O of the light guide body O). A plurality of prisms 134 may be formed on the outer peripheral surface of the above (four side surfaces). Further, on the side surface 160 of the light guide body 102, the area (or width in the Z-axis direction) of the light extraction surface 161 forming the plurality of prisms 134 increases as the distance from the light emitting module 121 (reflector 150) increases. The area (or width in the Z-axis direction) of the exit surface 162 becomes smaller. FIG. 11 is a perspective view illustrating the lighting fixture 1c according to another modified example.

Further, in the lighting fixtures according to the above-described second and third embodiments, the light of the first color may be light having a color temperature different from that of the light of the second color. In this case, the light of the first color may be light having a lower color temperature than the light of the second color, or may be light having a higher color temperature. In this case, if there is only one light source, the concentration or type of the phosphor in the cavity may be different. For example, the concentration or type of the phosphor in the cavity between the light emitting element and the reflector may be different from the concentration or type of the phosphor in the cavity between the light guide and the light emitting element.

Further, in the lighting fixture according to the first embodiment, the plurality of prisms may be formed on the exit surface. In this case, the plurality of prisms formed on the exit surface may emit light from the facing surface, and the facing surface may also be the exit surface, and the exit surface on which the plurality of prisms are formed may also be the light extraction surface. good.

It should be noted that the components and functions of the above-described embodiments 1 to 3 can be obtained by subjecting various modifications to those skilled in the art, and the components and functions of the embodiments 1 to 3 without departing from the spirit of the present disclosure. The present disclosure also includes a form realized by any combination.

1,1a, 1b,

1c Lighting equipment

21, 121a, 121b, 121c Light emitting module (light source)
30, 100, 101, 102 Light guides 31, 131

Incident surface

32, 132

Exit surface

33, 133 Opposing surface (light extraction surface)
34, 134 Prism

34a First surface

34b Second surface

132, 162 Exit surface 161 Light extraction surface

Claims

Light source and
It has an incident surface on which the light emitted by the light source is incident and a light extraction surface for emitting the light incident from the incident surface from the emitting surface, and a plurality of prisms for emitting the light from the emitting surface are formed. It is provided with a columnar or plate-shaped light guide body to be formed.
On the light extraction surface, the plurality of prisms having a first surface inclined with respect to the optical axis direction of the light emitted by the light source and a second surface facing the first surface are formed.
When the cross section of the light guide body is cut in a plane orthogonal to the light extraction surface and parallel to the optical axis direction, the first angle of the first surface with respect to the optical axis direction is set to θ1, and the light Let θ2 be the second angle of the second surface with respect to the axial direction, L1 be the distance between two adjacent prisms among the plurality of prisms, and L2 be the width of the plurality of prisms along the optical axis direction. , The following equations (1) to (3) hold 0 <L2 ≤ 0.5 × L1 equation (1)
25 ° ≤ θ1 ≤ 58 ° Equation (2)
0 <θ1 + 10 ° <θ2 ≦ 90 ° Equation (3)
lighting equipment.
The luminaire according to claim 1, wherein the width L2 is 1/6 of a distance L1 between two adjacent prisms.
The first surface is an inclined surface facing the light source side.
The luminaire according to claim 1 or 2, wherein the second surface is a surface of the prism opposite to the first surface.
The luminaire according to any one of claims 1 to 3, wherein each of the plurality of prisms is a long groove extending in a direction orthogonal to the optical axis direction.
The light guide body is columnar and has a columnar shape.
The plurality of prisms are formed on the light extraction surface along the length direction of the light guide body, and are not formed on the surface opposite to the light extraction surface in line symmetry with the length direction. The lighting equipment according to any one of items 1 to 4.