JP6239309B2 - Lighting unit and lighting device using the same - Google Patents

Description

  Embodiments described herein relate generally to a lighting unit and a lighting device using the lighting unit.

  Fluorescent lamps have been widely used as lighting units used in lighting devices. However, in recent years, lighting devices using lighting units using light emitting diodes (LEDs), which have less environmental burden than fluorescent lamps, have started to appear. New lighting units such as organic EL are also being developed.

JP 2011-14515 A

  However, in a new illumination unit represented by an LED, the direction of irradiation is determined, and it cannot be irradiated in all directions as in a fluorescent lamp. This is because, in the case of an LED, the light emitting region is a flat surface, and irradiation can be performed only in the front direction centered on the normal direction of the flat surface.

  Such irradiation on only one side may be rather convenient depending on the lighting device, but in most cases, it becomes an illuminance space that is uncomfortable with the replacement with a fluorescent lamp. In particular, in an illuminating device that also requires irradiation on the opposite side of the main irradiation direction, an illuminating unit represented by an LED cannot irradiate the opposite side at all, which is a very important problem.

  This invention is made | formed in view of the above point, The subject is providing the illuminating unit which can be irradiated also to the other side of the main irradiation direction, and an illuminating device using the same.

According to the embodiment, the lighting unit has a light source array that has directivity and is arranged in a line, and a shape that extends in the longitudinal direction along the light source array . comprising a cover for covering corresponding to 1, wherein the cover extends along the row of light sources provided in an end portion in the width direction, extends along the provided the light source array, the light source array It has a reflecting surface inclined toward the back side of the light source array with respect to a surface perpendicular to the optical axis, and the incident light is reflected by the reflecting surface so that the main light quantity is 90 with respect to the directivity direction of the light source array. A prism region that irradiates in the back direction that differs by more than a certain degree, and a condensing unit that extends along the light source column and collects light in the central region in the width direction.

FIG. 1 is a perspective view showing an illumination unit and an illumination device using the illumination unit according to the first embodiment. FIG. 2 is a cross-sectional view showing comparison of irradiation areas of the lighting device and lighting devices according to Comparative Examples 1 and 2. FIG. 3 is a sectional view of the illumination unit. FIG. 4 is a view showing a ray trajectory of the illumination unit. FIG. 5 is a view showing a light distribution of the illumination unit. FIG. 6 is a cross-sectional view of an illumination unit according to the second embodiment. FIG. 7 is a view showing a ray trajectory of an illumination unit according to the second embodiment. FIG. 8 is a view showing a light distribution of the illumination unit according to the second embodiment. FIG. 9 is a cross-sectional view of the illumination device according to the third embodiment. FIG. 10 is a cross-sectional view of a lighting unit according to the third embodiment. FIG. 11 is a diagram illustrating a light ray trajectory of an illumination unit according to the third embodiment. FIG. 12 is a view showing a light distribution of the illumination unit according to the third embodiment. FIG. 13: is sectional drawing of the illuminating device which concerns on 4th Embodiment. FIG. 14 is a cross-sectional view of an illumination unit according to the fourth embodiment. FIG. 15 is a view showing a ray trajectory of an illumination unit according to the fourth embodiment. FIG. 16 is a view showing a light distribution of the illumination unit according to the fourth embodiment. FIG. 17 is a cross-sectional view illustrating a lighting device according to a fifth embodiment. FIG. 18 is a plan view showing a lighting device according to a fifth embodiment. FIG. 19 is a perspective view showing a lighting device according to a fifth embodiment. FIG. 20 is an enlarged cross-sectional view of a part of the cover of the lighting device. FIG. 21 is a cross-sectional view showing an irradiation state of a lighting device according to a comparative example using a fluorescent lamp as a light source. FIG. 22 is a cross-sectional view illustrating an irradiation state of a lighting device according to another comparative example having no cover. FIG. 23 is a cross-sectional view for explaining the lens action of the cover. FIG. 24 is a view showing a ray trajectory of the cover. FIG. 25 is a view showing a light distribution of the cover. FIG. 26 is a diagram schematically showing an irradiation environment of a living space when the lighting device is used as a pendant light. FIG. 27 is a cross-sectional view showing another structure of a cover used in the lighting device. FIG. 28 is a cross-sectional view showing a lighting device according to a sixth embodiment.

Hereinafter, the illumination device according to the embodiment will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view showing an illumination unit according to the first embodiment and an illumination device using the illumination unit, and FIG. 2 shows an illumination area according to the embodiment and illumination areas according to Comparative Examples 1 and 2. It is a side view shown in comparison.

  As shown in FIG. 1, the illumination device 10 includes an illumination unit 1 made of LEDs, and is configured as a wall surface installation type illumination device installed on a wall surface 12. The illuminating device 10 irradiates the shade 11 of the illuminating device 10 while irradiating the upper wall surface and the ceiling. The illumination device 10 is, for example, extended in the horizontal direction and formed to a length of about 1.3 m. In FIG. 1, the side plates are not shown so that the internal structure of the lighting device 10 can be understood.

  The illumination unit 1 includes a metal housing 2 having a substantially U-shaped cross section, an elongated substrate 3 fixed to the housing 2, and a light source 4 composed of LEDs linearly mounted on the substrate 3, A cover 5 having a function of covering the light source 4 and controlling the light distribution of the light source 4. For example, the light source 4 has directivity in the normal direction of the substrate 3. The cover 5 is elongated and has a shape elongated in the longitudinal direction.

  The illuminating device 10 includes a substantially L-shaped support body 14 having an installation surface fixed to a wall surface 12, a light shielding wall 16 that faces the support body in a substantially parallel manner with a gap, and the support body 14 and the light shielding wall 16. And a rectangular plate-like shade 11 provided between the two. The shade 11 is made of, for example, a translucent milk white resin. A bracket 18 is fixed to the support 14, and the housing 2 of the lighting unit 1 is placed on the bracket. Thereby, the illumination unit 1 is located between the support 14 and the light shielding wall 16 and extends in parallel with the light shielding wall and the shade 11.

  FIG. 2A shows an illumination area of the illumination apparatus 10 according to the first embodiment, and FIG. 2B shows an illumination apparatus including an illumination unit using a fluorescent lamp as a light source according to Comparative Example 1. FIG. 2C shows an illumination area of the illumination device according to the comparative example 2 that includes an illumination unit that uses an LED as a light source and does not have a cover.

As shown in FIG. 2B, in the illumination device of Comparative Example 1 using the fluorescent lamp 9, light is emitted from the fluorescent lamp 9 in all directions inside the device, and the illumination device shields light other than upward illumination and shade 11 Thus, the above-described irradiation is realized. As shown in FIG.2 (c), when the illumination unit using the light source 4 which consists of LED is installed upward, the wall surface 12 can be irradiated, but the shade 11 which becomes the other side cannot be irradiated.
As shown in FIG. 2A, in the present embodiment, the light distribution control action of the cover 5 realizes light irradiation in almost opposite directions.

Hereinafter, the light distribution control action of the lighting unit 1 according to the first embodiment will be described.
FIG. 3 is a cross-sectional view of the illumination unit of the illumination apparatus according to the present embodiment, FIG. 4 is a diagram illustrating a light path of the illumination unit, and FIG. 5 is a diagram illustrating a light distribution of the illumination unit.

  As shown in FIG. 3, in the lighting unit 1, light sources 4 made of LEDs are arranged, for example, in a row along a horizontal direction on a substrate 3 mounted on a housing 2 made of aluminum. A cover 5 made of a transparent resin made of polycarbonate or the like is covered.

  The cover 5 has a substantially dome-shaped cross section, covers the light source 4, and both ends thereof are supported by the housing 2. A back irradiation prism 6 is formed in the vicinity of one end in the width direction of the cover 5, here, in the end opposite to the wall surface 12, that is, in the vicinity of the end on the side of the shade 11. A condensing prism 7 or a lens (light condensing part) for condensing light in the ceiling direction and the wall surface 12 direction is formed in the part. The back irradiation prism 6 and the condensing prism 7 extend over substantially the entire length of the cover 5 in the longitudinal direction.

  As shown in FIGS. 3 and 4, the back side illumination prism 6 totally reflects the light beam incident on the cover 5 from the light source 4, changes the direction from the substrate 3 toward the back side, and emits the light to the shade 11 of the illumination device 10. Adjust to irradiate toward. That is, the back irradiation prism 6 totally irradiates light in the opposite direction that differs by 90 degrees or more with respect to the directivity direction of the light source 4 (normal direction of the substrate 3). Further, the right half surface of the cover 5 (the half surface on the wall surface 12 side) forms a convex lens that is gently condensed. On the left half surface of the cover 5, the area other than the back-illuminating prism 6 is the condensing prism 7. It adjusts so that the light beam which radiates | emits and irradiates the wall surface 12 upper direction.

  The light emitted from the illumination unit 1 cannot be directly emitted from the light source 4 by the backside illumination prism 6 and irradiates the back side from the substrate 3 and is stronger toward the wall surface 12 at an angle parallel to the wall surface. Irradiate with light intensity. As a result, the illumination unit 1 can uniformly irradiate a larger wall surface area irradiated with a fluorescent lamp as a light collection distribution.

  In this way, by using the illumination unit 1 having the cover 5 provided with the backside illumination prism 6, even if a directional light source 4 such as an LED is used, two opposite directions on the front side and the back side can be simultaneously observed. Can be irradiated.

  Next, lighting units and lighting devices according to other embodiments will be described. In other embodiments to be described later, the same parts as those in the first embodiment described above are denoted by the same reference numerals, detailed description thereof is omitted, and different parts are mainly described in detail.

(Second Embodiment)
FIG. 6 is a cross-sectional view of the illumination unit of the illumination apparatus according to the second embodiment, FIG. 7 is a diagram showing a light ray trajectory of the illumination unit, and FIG. 8 is a diagram showing a light distribution of the illumination unit.

  According to the present embodiment, the light sources 4 made of LEDs are arranged in two lines in a linear manner. The cover 5 is provided so as to cover the two rows of light sources 4 and is integrally formed with the back irradiation prism 6.

  Even when the light source 4 has a two-row configuration due to an increase in the amount of light or the like, it is possible to irradiate the back side of the substrate 3 with the illumination device by using the back side illumination prism 6.

(Third embodiment)
FIG. 9 is a cross-sectional view showing an illumination device and an irradiation area according to the third embodiment, FIG. 10 is a cross-sectional view of the illumination unit, FIG. 11 is a diagram showing a ray trajectory of the illumination unit, and FIG. FIG.

  The lighting device 10 is installed on the wall surface 12 in the vicinity of the floor 13 and irradiates the wall surface 12 and the floor surface 13. In the illumination unit 1 of the illumination device 10, the light sources 4 made of LEDs are arranged in two lines in a line. The cover 5 is provided so as to cover the two rows of light sources 4, and has a back irradiation prism 6 integrally at both ends in the width direction.

  A part of the light emitted from the light source 4 is irradiated to the floor surface 13 side by the back irradiation prisms 6 provided at both ends of the cover 5. Further, the condensing lens and the prism provided in the area of the cover 5 excluding the back side irradiation prism 6 collects a part of the light from the light source 4 and irradiates the wall surface 12 side.

  The lighting unit 1 is formed symmetrically to increase versatility. Therefore, even when the lighting unit 1 is installed with the longitudinal direction turned over, the light distribution is exactly the same.

  By using the illumination unit 1 configured in this way, an illumination device capable of simultaneously irradiating two opposite directions can be obtained.

(Fourth embodiment)
FIG. 13 is a cross-sectional view showing a lighting device and an irradiation area according to the fourth embodiment, FIG. 14 is a cross-sectional view of the lighting unit, FIG. 15 is a view showing a ray trajectory of the lighting unit, and FIG. FIG.

  The illumination device 10 is installed on the wall surface 12 in the vicinity of the floor 13 and irradiates the wall surface 12 and the floor surface 13 as in the third embodiment. In the illumination unit 1 of the illumination device 10, the light sources 4 made of LEDs are arranged in two lines in a line. The cover 5 is provided so as to cover the two rows of light sources 4, and has a back irradiation prism 6 integrally at both ends in the width direction. The cover 5 includes a side surface irradiation unit 8 on the outer side of the back surface irradiation prism 6. Thereby, the illuminating device 10 can be irradiated also toward the shade 11 which is a side surface direction. Further, the cover 5 is made of a translucent milky white material so that the illumination device 10 itself appears to emit light, and the device itself is a shade 11.

  By using such an illumination unit 1, it is possible to irradiate simultaneously in the lateral direction in addition to the two opposite directions.

  In the above-described embodiment, the illumination device condenses light in the main irradiation direction, but the light collection is not necessarily required. Depending on the illumination device 10, the back side illumination prism 6 may irradiate the back side. If possible, there is no need to collect light in the front direction. In the above-described embodiment, all components except for the light source can be manufactured by straight-cutting by extrusion molding. Thus, a back-illuminated prism having a sticking shape that cannot be punched by injection molding or the like is provided. Cover can be realized.

(Fifth embodiment)
FIG. 17 is a cross-sectional view showing a lighting device according to the fifth embodiment, FIG. 18 is a plan view of the lighting device, FIG. 19 is a perspective view of the lighting device, and FIG. FIG.

  The lighting device 10 includes a lighting unit 1 and a shade 11 that covers the lighting unit. The illumination unit 1 includes a cylindrical housing (main body) 2, an annular substrate 3 placed on the lower surface of the housing, and a plurality of LEDs mounted in an annular arrangement on the substrate. A light source 4, a cover 5 covering the light source 4, and a power cord 15 connected to a drive circuit (not shown) provided in the housing and extending upward from the housing 2 are provided. The shade 11 is formed in a cylindrical shape whose both ends are closed, and is attached to the housing 2 to cover the entire lighting unit 1. The illuminating device 10 has a shape in which the illustrated cross section is rotated around a central axis C.

  The housing 2 is made of a metal having a cylindrical shape and has a hollow structure in which a central portion is hollowed out. A drive circuit (not shown) is accommodated in the hollow portion. The housing 2 also has a function of radiating heat generated by the light source 4 to the outside.

  The light source 4 is mounted on the substrate 3, is arranged in an annular shape at a substantially middle portion between the outer diameter and the inner diameter of the substrate 3, and is arranged at substantially equal intervals. The light source 4 emits strong light in the normal direction of the substrate 3 and has a directivity in which the light intensity in the side surface direction decreases in proportion to cos θ when the angle from the normal direction is θ. Yes. The substrate 3 is made of metal having a donut-shaped flat plate shape, and has a function of radiating heat generated by the light source 4 to the outside and conducting it to the housing 2.

  As shown in FIGS. 17 and 20, the cover 5 that covers the light source 4 is formed in a substantially annular shape by a transparent resin such as polycarbonate or acrylic, and is fixed to the housing 2 or the substrate 3. The cover 5 is formed on the outer peripheral side and extends from the substrate 3 so as to bend and extend in a ceiling direction (backward direction of the substrate 3). The cover 5 is formed on the inner peripheral side and collects light. And a condensing lens portion 5b that emits light. The lens action described later of the cover 5 enables omnidirectional illumination like a fluorescent lamp even though the light source 4 is a directional light source.

  The shade 11 is made of a translucent milk white resin and covers the lighting unit 1 including the housing 2, the light source 4, the substrate 3, and the cover 5. The power cord 15 has one end fixed to the housing 2 and the other end fixed to the ceiling (not shown), and the substrate 3 is attached to the substrate 3 by driving power generated by a driving circuit (not shown) energized through the power cord 15. The light source 4 is turned on.

  FIG. 21 shows the degree of irradiation to the shade 11 of the lighting device using the fluorescent lamp 9 as the light source as the comparative example 1, and FIG. 22 uses the LED as the light source 4 and the cover 5 as the comparative example 2. The irradiation degree to the shade 11 of the illuminating device which does not have is shown.

  As shown in FIG. 21, when a fluorescent lamp 9 is used as a light source, light is radiated from the fluorescent lamp 9 in all directions inside the illuminating device, and irradiation of the entire shade 11 is realized. On the other hand, as shown in FIG. 22, in the case where there is no cover 5 and only the light source 4, light cannot be irradiated on the upper surface and the upper side surface of the shade 11 due to the finger property of the light source 4 composed of LEDs.

  According to the present embodiment, the light distribution is controlled by the lens action of the cover 5, thereby realizing irradiation of the entire shade 11 as in the fluorescent lamp 9. The effects will be described below.

  FIG. 23 shows the action of the lens of the cover 5, FIG. 24 shows the ray trajectory of the cover, and FIG. 25 shows the luminous intensity distribution of the cover. As described above, the light guide lens portion 5 a is formed on the outer peripheral portion of the cover 5. As shown in FIGS. 23 to 25, the light guide lens unit 5a takes in the light emitted from the light source 4 to the outside, and guides the light to the side and the ceiling while emitting a part of the light. By this action, the side surface and the top surface of the shade 11 are uniformly irradiated.

  On the other hand, a condensing lens portion 5 b is formed on the inner peripheral portion of the cover 5. The condensing lens portion 5b emits the light incident in a relatively direct downward direction (normal direction) from the light source 4 as it is, and emits the light incident in a relatively horizontal direction from the light source 4 on the inner peripheral side wall surface portion. Then, the light is totally reflected and emitted in the direction immediately below. In other words, the light emitted inward from the light source 4 is condensed in the downward direction by the condenser lens portion 5b and emitted.

  FIG. 26 schematically shows the irradiation environment of the living space when the lighting device 10 according to the present embodiment is used as a pendant light. Usually, in such a living space, the main lighting device 30 for the main light source is installed on the ceiling surface 31 at the center of the room, and for example, a pendant light is installed directly above the table 32 such as a dining table. In such a living space, the pendant light is required to have the role of illuminating the table 32 while the shade 11 itself shines, and the main illumination device 30 plays the role of irradiating other portions. Therefore, the pendant light is unnecessary irradiation except that the shade 11 and the table 32 are illuminated.

  As shown in FIG. 24 and FIG. 25, according to the illuminating device 10 according to the present embodiment, the side surface and top surface of the shade 11 are irradiated almost uniformly by the cover 5, and the table directly below is concentrated. It can be seen that light is emitted efficiently and light is emitted efficiently in a diagonal direction, which is unnecessary irradiation as a pendant light. That is, it is possible to obtain a good quality living space by the cover 5.

  As described above, according to the present embodiment, by using the illumination unit 1 including the cover 5 having the light guide lens part and the condenser lens part, the direct light source 4 such as an LED is used directly below. An illuminating device capable of simultaneously irradiating light in two opposite directions of the direction and the ceiling surface side can be obtained.

  In the fifth embodiment, the shade 11 covers the lighting unit 1 having the housing 2, the light source 4, the substrate 3, and the cover 5, but the lighting device may be configured without the shade 11. In this case, since the cover 5 itself shines in the same way as a fluorescent lamp, there is no need to pay particular attention to the presence or absence of the shade 11, and only the illumination unit may be configured.

  In the fifth embodiment, the condensing lens portion 5b is formed on the inner peripheral portion of the cover 5. For example, when the illumination device 10 is used as the main illumination, only the portion immediately below is concentrated. It is preferable to irradiate the entire floor of the room uniformly. In this case, it is not necessary to form a lens or the like inside the cover 5. For example, as shown in FIG. 27, it is preferable that the inner peripheral portion of the cover 5 has a uniform thickness without lens action. That is, as for the inner peripheral side shape of the cover 5, an optimal shape may be selected as appropriate depending on the use environment of the lighting device 10.

(Sixth embodiment)
FIG. 28 is a cross-sectional view of the illumination device according to the sixth embodiment. According to the present embodiment, the shape of the shade 11 is different from that of the fifth embodiment. The shade 11 has a truncated cone shape in cross section, and is formed in a so-called umbrella shape. The shade 11 is attached to the housing 2, covers the periphery of the lighting unit 1, and opens the lower part of the cover 5. The other structure of the illuminating device 10 is the same as that of 5th Embodiment.

  According to the sixth embodiment, since the cover 5 has the same configuration as that of the fifth embodiment, the lens action thereof does not change. Therefore, the same operational effects as those of the fifth embodiment described above can be obtained. That is, the effect of the lighting device 10 does not depend on the shape of the shade 11. Therefore, for example, the shade 11 may have a shape that is not rotationally symmetric, such as a polyhedron, and the shape may be appropriately selected according to needs.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 ... Lighting unit, 2 ... Housing | casing, 3 ... Board | substrate, 4 ... Light source, 5 ... Cover,
5a ... light guide lens part, 5b ... condensing lens part, 6 ... backside illumination prism,
7 ... Condensing prism, 8 ... Side illumination unit, 10 ... Illumination device, 11 ... Sade

Claims (5)

A light source array having directivity and arranged linearly;
A cover that extends in the longitudinal direction along the light source row and covers the light source example in a one-to-one correspondence;
The cover has a reflecting surface that is provided at an end in the width direction and extends along the light source row, and is inclined toward the back side of the light source row with respect to a surface perpendicular to the optical axis of the light source row, a prism zone to be irradiated to 90 degrees or more different rear direction with respect to the incident light main light amount reflected by the reflective surface directivity direction of the light source row, extending along the light source array in a central region in the width direction A light collecting unit that collects existing light . The illumination unit according to claim 1 , wherein the cover further includes a side surface irradiation unit that is provided outside the prism region and irradiates light in a side surface direction. The illumination unit according to claim 1, wherein the condensing unit is a condensing unit that condenses main light in a direction inclined to the opposite side to the prism region with respect to the optical axis of the light source array. The lighting unit according to any one of claims 1 to 3 ,
A support for supporting the lighting unit;
A lighting device comprising: The illuminating device of Claim 4 provided with the shade provided facing the light irradiated from the said prism area | region of the said illumination unit.

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