JP6827275B2 - Light source unit and lighting equipment - Google Patents

Description

The present invention relates to a light source unit and a luminaire that control the traveling direction of light emitted from a light source.

A light emitting diode is known as a light source used in a lighting fixture. The light emitting diode is referred to as an LED in the following description. LED is an abbreviation for Light Emitting Diode. In recent years, LEDs have been used as light sources for various lighting fixtures because of their improved luminous efficiency and luminous flux. For example, there is known a lighting fixture in which LED light sources are arranged in a row and covered with a light-transmitting diffusion cover. Further, Patent Document 1 discloses a lighting fixture in which a gutter-shaped cover is arranged on the irradiation direction side of the LED. The cover of Patent Document 1 has prisms that are light distribution control units that distribute the light emitted from the LEDs to the side and the ceiling side at both ends in the width direction orthogonal to the direction in which the LEDs are arranged. ing.

JP 2015-11894

However, in the luminaire disclosed in Patent Document 1, the light distribution control unit provided on the cover has a thick wedge shape. Therefore, the difference in material thickness between the light distribution control unit and the portion other than the light distribution control unit is large. Therefore, it is difficult to mold the cover in manufacturing. In addition, the cost increases as the thickness of the material increases.

The present invention has been made to solve the above-mentioned problems, and provides a light source unit and a luminaire having a cover that can be easily molded at no cost.

The light source unit according to the present invention is provided in front of a light source that emits light, a substrate on which the light source is mounted, a housing on which the back surface of the mounting surface of the light source on the substrate is mounted, and emits light from the light source. A cover for controlling the traveling direction of the light is provided, and the cover provides light emitted from the light source on the first direction side, which is the light emission direction of the light source, and on the housing side, which is the opposite side of the first direction. The control convex portion has a control convex portion for controlling the light distribution on the second direction side of the above, and the control convex portion has a first light incoming surface for controlling the light distribution to the first direction side and a first incoming light. A second light incident surface extending inward from the surface and light extending outward from the second light input surface and entering light on the second light input surface are positively reflected and arranged on the second direction side. possess a reflecting surface for light control, the first inclination angle first light incident surface is an angle inclined with respect to the optical axis is an angle the second light incident surface is inclined with respect to the optical axis a 2 Less than the tilt angle .

According to the present invention, the cover has control protrusions for controlling light distribution on the first direction side and the second direction side. In particular, when the control convex portion has a first light incoming surface, a second light incoming surface, and a reflecting surface, the thickness of the control convex portion can be suppressed and the amount of protrusion can be suppressed. Therefore, the cover can be easily molded at no cost.

It is a perspective view which shows the light source unit 100 which concerns on Embodiment 1 of this invention. It is an exploded perspective view which shows the light source unit 100 which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the light source unit 100 which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the traveling direction of the light of the light source unit 100 which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the traveling direction of the light of the light source unit 100 which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the traveling direction of the light of the light source unit 100 which concerns on Embodiment 1 of this invention. It is a graph which shows the light distribution of light of the light source unit 100 which concerns on Embodiment 1 of this invention. It is a perspective view which shows the luminaire 1 which concerns on Embodiment 1 of this invention. It is a perspective view which shows the luminaire 2 which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the light source unit 200 which concerns on Embodiment 2 of this invention.

Embodiment 1.
Hereinafter, embodiments of the light source unit and the luminaire according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the light source unit 100 according to the first embodiment of the present invention, and FIG. 2 is an exploded perspective view showing the light source unit 100 according to the first embodiment of the present invention. The light source unit 100 will be described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, the light source unit 100 includes a light emitting unit 110, a housing 120, a cover 130, and an end plate unit 140.

The light emitting unit 110 includes a light source 111, a substrate 112, a reflecting unit 113, and a diffusing unit 114. The light source 111 is a light emitting element that emits light, for example, an LED. The light source 111 may be an element in which, for example, a chip that emits blue light having a wavelength of about 440 nm to 480 nm and a phosphor that converts blue light into yellow light are provided inside the resin package. In this case, the light source 111 is a light emitting element that emits white light that is a combination of blue light and yellow light. The light source 111 may be a surface mount type LED element, a COB type light emitting module, an organic EL element, or a laser diode.

The substrate 112 is, for example, a rectangular plate-shaped member extending in the longitudinal direction (arrow X direction), and a plurality of light sources 111 are mounted on one surface along the longitudinal direction (arrow X direction). Further, circuit elements such as diodes (not shown) and terminals such as connectors (not shown) are mounted on the substrate 112. By applying a white resist or the like to the surface of the substrate 112, the reflectance of light can be increased. By increasing the reflectance of light, the luminous efficiency of the light source unit 100 can be increased.

The reflecting unit 113 is provided so as to surround the light source 111 in front of the light source 111 and the substrate 112, and reflects the light emitted from the light source 111 in the wide-angle direction with respect to the optical axis to the front. The reflecting portion 113 extends in the longitudinal direction, and both end faces are opened. The reflective portion 113 has a rail portion that supports the cover 130 and an internal inclusion portion that includes the housing 120. The diffusion portion 114 is a plate-shaped member provided on the side of the substrate 112 on which the light source 111 is arranged and covers the light source 111 and the substrate 112. The diffusing unit 114 diffuses the light emitted from the light source 111, and the graininess appearing on the cover 130 can be suppressed by the light distribution characteristics of the light source 111.

The housing 120 has a plate-shaped mounting portion 121 to which the substrate 112 is mounted, and side portions 122 extending from both side ends of the mounting portion 121 to the side opposite to the board 112. The back surface of the mounting surface of the light source 111 on the substrate 112 on which the light source 111 is mounted is attached to the mounting portion 121 by an adhesive or the like. The heat generated by the light source 111 is transmitted to the mounting portion 121 via the substrate 112, transferred from the mounting portion 121 to the side portion 122, and released from the side portion 122 to the atmosphere. As described above, the housing 120 has a function of a heat radiating plate or a heat sink that emits heat generated by the light source 111.

The cover 130 is provided on the side of the substrate 112 on which the light source 111 is arranged, extends in the direction of the optical axis of the light source 111, and has a light distribution control function of controlling the traveling direction of the light emitted from the light source 111. There is. Here, the optical axis refers to the direction of light emitted from the light source 111 in the normal direction (arrow Z1 direction). The cover 130 has a front surface portion 131 facing the light source 111, and side surface portions 132 extending from both side portions 122 of the front surface portion 131 toward the substrate 112. The cover 130 has a symmetrical shape centered on the optical axis. The cover 130 may be integrally formed by extrusion molding, or may be integrally formed by attaching each member formed by injection molding with an adhesive. Further, the cover 130 is made of a transparent material such as acrylic or polycarbonate that transmits light. The refractive index of the material is, for example, 1.4 or more and 1.7 or less.

Two end plate portions 140 are provided, and are attached by being adhered to both end faces in the longitudinal direction of the cover 130 and both end faces in the longitudinal direction of the reflection portion 113, and both end surfaces in the longitudinal direction of the cover 130 and the reflection portion 113. It closes both end faces in the longitudinal direction of.

FIG. 3 is a cross-sectional view showing the light source unit 100 according to the first embodiment of the present invention, and is a cross-sectional view taken along the line AA of FIG. Next, the cover 130 will be described in detail. As shown in FIG. 3, the front portion 131 is a flat transparent member that is refracted by incident light having a small vertical perpendicularity to the optical axis among the light emitted from the light source 111. Here, the vertical right angle means an angle of inclination with respect to the optical axis in the vertical direction (arrow Z direction). The front portion 131 has a diffusion recess 131a that diffuses the light emitted from the light source 111. The diffusion recess 131a has a function of a concave lens, and diffuses the light emitted from the light source 111 so as to spread the traveling direction within a predetermined range. As a result, the light source unit 100 can diffuse the light emitted from the light source 111 and make the light distribution characteristics of the light source 111 on the emission direction side uniform.

The side surface portion 132 is a transmissive member extending in the direction of the optical axis of the light source 111 and having an incident surface 132a, a medium internal 132c, and an emitting surface 132b. From the tip end portion of the side surface portion 132, a protruding portion extending in a direction facing each other is provided. The cover 130 is attached to and supported by the reflecting portion 113 by engaging the protruding portion with the rail portion of the reflecting portion 113. The incident surface 132a is formed on the inner wall side of the side surface portion 132 into which the light emitted from the light source 111 is incident, and a plurality of control convex portions 133 are formed on the incident surface 132a. In the medium 132c, the light incident from the incident surface 132a travels. The exit surface 132b is a boundary surface between the inside 132c of the medium and the outside, and is formed on the outer wall side of the side surface portion 132 that emits the incident light to the outside of the cover 130. As shown in FIG. 3, the light source unit 100 is installed on the ceiling C, which is an installation surface, so that the boundary line between the side surface portion 132 and the reflection portion 113 is along the ceiling surface.

FIG. 4 is a schematic view showing the traveling direction of light of the light source unit 100 according to the first embodiment of the present invention. Next, the control convex portion 133 will be described. As shown in FIG. 4, the control convex portion 133 has a first light incoming surface 133a, a second light entering surface 133b, and a reflecting surface 133c. The first light incoming surface 133a is a surface inclined at a predetermined first inclination angle θa with respect to the optical axis, and distributes the light emitted from the diffuser 114 at a vertical perpendicularity θ and entering light to the first direction side. It controls. Here, the first direction is the light emitting direction of the light source 111, and refers to the arrow Z1 direction. The first inclination angle θa of the first light entry surface 133a becomes smaller and longer as it goes away from the light source 111 and toward the front portion 131. That is, the range L formed of the first light incoming surface 133a along the incident surface 132a becomes wider toward the front portion 131 away from the light source 111.

FIG. 5 is a cross-sectional view showing the traveling direction of light of the light source unit 100 according to the first embodiment of the present invention. As shown in FIG. 5, the second light entry surface 133b extends inward from one end of the first light entry surface 133a on the front surface 131 side, and has a predetermined second inclination angle θb with respect to the optical axis. It is an inclined surface. Here, the second inclination angle θb is larger than the first inclination angle θa. Further, the second inclination angle θb is substantially the same on each of the second light incoming surfaces 133b. Further, the tip of the second light receiving surface 133b is formed so that the height H from the reference line parallel to the side surface portion 132 is substantially the same. As a result, the second light receiving surface 133b has substantially the same shape.

Here, the light input region I and the non-light input region N formed on the first light input surface 133a will be described. As shown in FIG. 5, in the first light entering surface 133a, the first inclination angle θa becomes smaller from the light source 111 toward the front portion 131, and the height H of the second light entering surface 133b from the reference line becomes smaller. Is substantially the same, so that the length L of the first light receiving surface 133a becomes long. An incoming light region I and a non-light incident region N are formed on the first light incoming surface 133a. The light entry region I is a region where the light emitted from the light source 111 enters. The non-light entry region N is a region adjacent to the light source 111 side of the light entry region, and is a region in which the light emitted from the light source 111 does not enter.

The non-light receiving region N is a region generated due to the light emitted from the light source 111, which is refracted by the light incident on the second light receiving surface 133b and does not reach the first light receiving surface 133a. is there. As the distance from the light source 111 toward the front portion 131 becomes smaller, the vertical perpendicularity of the light emitted from the light source 111 becomes smaller, so that the non-light receiving region N on the first light entering surface 133a becomes larger. On the other hand, the length of the first light entry surface 133a becomes longer as the distance from the light source 111 toward the front portion 131 increases. Therefore, the length of the light entering region I also becomes long. Therefore, as the distance from the light source 111 toward the front portion 131 becomes larger, the non-light incoming area N becomes larger, but the light incoming area I also becomes larger by that amount, so that the irradiation target is uniformly and uniformly irradiated with light. Can be done.

The reflecting surface 133c extends outward from the second light entering surface 133b. The reflection surface 133c is connected to one end on the front surface 131 side of the second light entry surface 133b and the other end on the light source 111 side of the first light entry surface 133a, and enters the second light entry surface 133b. The light is specularly reflected and the light distribution is controlled in the second direction. Here, the second direction is the direction opposite to the first direction, and refers to the arrow Z2 direction.

An end plate convex portion 141 is formed on the inner surface of the end plate portion 140 so as to be continuous with the control convex portion 133 of the cover 130. The shape of the end plate convex portion 141 is the same as that of the control convex portion 133.

Next, the traveling direction of the light entering the control convex portion 133 will be described. In FIG. 4, the optical path of light entering the first incoming surface 133a is referred to as an optical path A, and the optical path of light entering the second incoming surface 133b is referred to as an optical path B. First, the light of the optical path A will be described. The light that has reached the first light entry surface 133a is refracted and enters the cover 130, and travels inside the medium 132c. The light traveling through the medium 132c is refracted at the exit surface 132b, which is the interface between the medium inside 132c and the outside, and is emitted away from the emission surface 132b and toward the first direction. At this time, the vertical angle of the light emitted from the exit surface 132b is smaller than the vertical angle of the light entering the first light entry surface 133a. That is, the light that enters the first light entry surface 133a is controlled within a predetermined irradiation range.

FIG. 6 is a cross-sectional view showing the traveling direction of light of the light source unit 100 according to the first embodiment of the present invention. Next, the light of the optical path B will be described. The light that has reached the second incoming surface 133b is refracted toward the reflecting surface 133c, enters the cover 130, and travels to the inside 132c of the medium. The light traveling inside the medium 132c is specularly reflected by the reflecting surface 133c, directed toward the emitting surface 132b, refracted by the emitting surface 132b, and emitted away from the emitting surface 132b and toward the second direction side. As a result, as shown in FIG. 6, the light source unit 100 can irradiate the ceiling C, the wall, or the like, which is the installation surface of the light source unit 100.

The plurality of second light incoming surfaces 133b have substantially the same second inclination angle θb. Therefore, as the second incoming surface 133b approaches the front portion 131 side, the light that enters the second incoming surface 133b and is specularly reflected by the reflecting surface 133c is the light source of the ceiling C, which is the installation surface. Irradiate a position away from the unit 100. In this way, the light source unit 100 can brighten the ceiling C, which is the installation surface, in a wide range.

FIG. 7 is a graph showing the light distribution of light of the light source unit 100 according to the first embodiment of the present invention. As described above, in the control convex portion 133, the light incident surface 133a emits the light emitted from the light source 111 from the exit surface 132b toward the first direction side, and the second incident surface 133b emits light from the light source 111. The emitted light is emitted from the exit surface 132b toward the second direction. As a result, as shown in FIG. 7, the light entering the first incoming surface 133a has a light distribution distribution shown by the curve A. Curve A shows light with a vertical angle in the range of 0 ° to 40 °. Further, the light entering the second incoming surface 133b has a light distribution distributed as shown by the curve B. Curve B shows light with a vertical angle in the range of 90 ° to 100 °. In this way, the light source unit 100 can irradiate in two different directions. Further, by controlling the light distribution in the two directions of the light source unit 100, a region C which is a non-irradiated region where light is not irradiated is formed between the curve A and the curve B. Region C shows light with a vertical angle in the range of 50 ° to 90 °. Region C is a region that can be glare light. In this way, the light source unit 100 can suppress the occurrence of glare.

According to the first embodiment, the cover 130 has a control convex portion 133 that controls light distribution on the first direction side and the second direction side. In particular, since the control convex portion 133 has the first light incoming surface 133a, the second light incoming surface 133b, and the reflecting surface 133c, the thickness of the control convex portion 133 can be suppressed and the amount of protrusion can be suppressed. Therefore, the cover 130 can be easily molded at no cost. Further, since a plurality of control convex portions 133 are provided, the amount of protrusion per control convex portion 1331 can be suppressed. Therefore, the moldability can be improved.

Further, the control convex portion 133 includes a first light incoming surface 133a that controls the light distribution of the incoming light in the first direction side, and a second light incoming surface extending inward from the first light incoming surface 133a. It has 133b and a reflecting surface 133c that extends outward from the second incoming surface 133b and positively reflects the light entering the second incoming surface 133b to control the light distribution to the second direction side. .. As a result, the light distribution can be controlled in two directions, the first direction and the second direction. Further, the first inclination angle θa, which is the angle at which the first light incoming surface 133a is inclined with respect to the optical axis, is larger than the second inclination angle θb, which is the angle at which the second light incoming surface 133b is inclined with respect to the optical axis. small. Therefore, the light entering the second light incoming surface 133b goes to the reflecting surface 133c side instead of the exit surface 132b. As a result, the light entering the second incoming surface 133b is emitted not to the first direction side but to the second direction side.

Further, a control convex portion 133 is formed on the inner wall of the cover 130, and the outer wall of the cover 130 is formed in a flat shape. Therefore, when the light source unit 100 is attached to the installation surface or the like, it is possible to prevent the control convex portion 133 from being soiled and scratched. Further, when the light source unit 100 is used, the accumulation of dust on the control convex portion 133 is suppressed.

Further, in order to ensure the design of the cover 130, the distance between the control convex portions 133 may be so narrow that a predetermined light entry region I cannot be secured. Even in such a case, in the first embodiment, since the front portion 131 has the diffusion recess 131a, the irradiation of light from the light source unit 100 can be made uniform.

FIG. 8 is a perspective view showing the lighting fixture 1 according to the first embodiment of the present invention. As shown in FIG. 8, the light source unit 100 constitutes the lighting fixture 1 by being attached to the fixture main body 10. The instrument body 10 is, for example, a rectangular parallelepiped box body, and the bottom portion 11 is open. The instrument body 10 has a flange portion 12 extending from the bottom portion 11 in both width directions (arrow Y direction). The instrument body 10 is inserted into, for example, a hole formed in the ceiling C. At that time, the flange portion 12 hits the ceiling surface, and the appliance main body 10 is attached to the ceiling C. Further, the fixture main body 10 has a hollow portion 11a communicating with the opening, and the hollow portion 11a accommodates a part of the light source unit 100 inserted through the opening.

Embodiment 2.
FIG. 9 is a perspective view showing a lighting fixture 2 according to a second embodiment of the present invention. In the second embodiment, the outer shape of the cover 230 is different from that of the first embodiment. In the second embodiment, the parts common to the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences from the first embodiment will be mainly described.

As shown in FIG. 9, the lighting fixture 2 includes a fixture main body 20 attached to the ceiling C and a light source unit 200 attached to the fixture main body 20.

FIG. 10 is a cross-sectional view showing the light source unit 200 according to the second embodiment of the present invention, and is a cross-sectional view taken along the line BB of FIG. As shown in FIG. 10, the light source unit 200 includes a light emitting unit 210 including a light source 211 and a substrate 212, a housing 220, and a cover 230. The light source 211, the substrate 212, and the housing 220 are common to the first embodiment. The front portion 231 of the cover 230 has a dome shape, and the side surface portion 232 is provided with a control convex portion 233. The control convex portion 233 is the same as the control convex portion 133 of the first embodiment. Therefore, the same effect as that of the first embodiment is obtained.

1 Lighting equipment, 2 Lighting equipment, 10 Equipment body, 11 Bottom, 11a Hollow part, 12 Flange part, 100 Light source unit, 20 Equipment body, 110 Light emitting part, 111 Light source, 112 Board, 113 Reflecting part, 114 Diffusing part, 120 Housing, 121 mounting part, 122 side part, 130 cover, 131 front part, 131a diffusion recess, 132 side part, 132a incident surface, 132b exit surface, 132c medium inside, 133 control convex part, 133a first light incoming surface , 133b Second entrance surface, 133c Reflection surface, 140 end plate part, 141 end plate convex part, 200 light source unit, 210 light emitting part, 211 light source, 212 board, 220 housing, 230 cover, 231 front part, 232 Side part, 233 control convex part, C ceiling.

Claims (8)

A light source that emits light and
The board on which the light source is mounted and
A housing to which the back surface of the mounting surface of the light source on the substrate is attached, and
A cover provided in front of the housing and controlling the traveling direction of the light emitted from the light source is provided.
The cover is
A control convex portion that controls the light distribution of the light emitted from the light source to the first direction side, which is the light emission direction of the light source, and the second direction side, which is the housing side and is opposite to the first direction. Have,
The control convex portion is
A first light entry surface that controls the light distribution of the incoming light to the first direction side,
A second light entry surface extending inward from the first light entry surface, and
It has a reflecting surface that extends outward from the second light entering surface, specularly reflects the light that has entered the second light entering surface, and controls the light distribution toward the second direction side.
The first inclination angle, which is the angle at which the first light incoming surface is inclined with respect to the optical axis, is
A light source unit smaller than the second tilt angle, which is the angle at which the second light incoming surface is tilted with respect to the optical axis. A plurality of the first light incoming surfaces are formed, and the first light receiving surface is formed.
The plurality of the first light receiving surfaces are
The light source unit according to claim 1, which is configured to increase in length as the distance from the light source increases. A plurality of the second light receiving surfaces are formed, and the second light receiving surface is formed.
The plurality of the second light receiving surfaces are
The light source unit according to claim 1 or 2, which has substantially the same shape. On the first light receiving surface,
An incoming area where the light emitted from the light source enters, and
The light source unit according to any one of claims 1 to 3, wherein a non-light entry region in which light emitted from the light source does not enter is formed. The cover is
A side surface portion extending in the direction of the optical axis and having the control convex portion,
The light source unit according to any one of claims 1 to 4, further comprising a front surface portion connected to the side surface portion and facing the light source. The front part
The light source unit according to claim 5, further comprising a diffusing cavities you diffuses the light emitted from the light source. A diffusing portion provided on the side of the substrate on which the light source is arranged and diffusing the light emitted from the light source,
The light source unit according to any one of claims 1 to 6, further comprising a reflecting unit that is provided so as to surround the light source and reflects light emitted from the light source. The light source unit according to any one of claims 1 to 7.
An instrument body having a hollow portion in which an opening is formed and a part of the light source unit that communicates with the opening and is inserted through the opening is housed.
Lighting equipment equipped with.

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