JP6655807B2 - Lens unit and lighting equipment - Google Patents

Description

The present invention relates to lenses units and lighting fixtures, and more particularly, a lens unit composed of a plurality of lenses for refracting light emitted from the light source, and a lighting fixture having lenses unit.

  As a conventional example, an optical lens (lens), a lens unit, and a lighting device described in Patent Document 1 are exemplified. The lighting device described in Patent Literature 1 is a lighting device (a road light, a street light, a security light, and the like) used for road lighting. Such a lighting device is attached to the tip of a lighting pole that is erected along the road, and more light is provided in the longitudinal direction of the road (in the direction in which people and vehicles come and go) with respect to the width direction of the road. (Visible light). Therefore, the lighting apparatus described in Patent Literature 1 includes a lens (lens unit) for realizing the light distribution characteristics as described above.

JP 2012-145904 A

  By the way, the surface of the lens is usually formed with a smooth curved surface such as a spherical surface. However, in a lens having only a smooth curved surface, the light (luminous flux) emitted in a specific direction is reduced while the light (luminous flux) emitted in a direction other than the specific direction is maintained or increased. It is difficult to realize such light distribution characteristics.

  The present invention has been made in view of the above problems, and has as its object to easily achieve desired light distribution characteristics.

The lens unit of the present invention includes a plurality of lenses, a connecting portion that connects the plurality of lenses, and an auxiliary lens that is parallel to the plurality of lenses, and each of the plurality of lenses includes a plurality of light sources. An incident surface on which light emitted from a corresponding one of the light sources is incident, a propagation portion for transmitting the light incident on the incident surface, and a smooth curved surface, and the light propagated through the propagation portion. An emission surface that emits out of the propagation unit, and a groove, wherein the groove has a V-shaped cross-sectional shape in the width direction, and is formed so as to fall into the propagation unit from the emission surface, and the groove is formed. Has a pair of slopes that fall into the propagation section from the emission surface , and is configured to totally reflect a part of light propagating through the propagation section by the pair of slopes , and the width direction. In the orthogonal direction, the Is formed in a portion of the reflecting surface, the auxiliary lens is characterized that you have been formed in a triangular prism shape.

Luminaire of the present invention is characterized by comprising a multiple light source, and lenses unit, the plurality of light sources, and the instrument body for supporting the front Symbol lens unit.

Lenses unit and an illumination fixture of the present invention has an effect that it is possible to easily realize a desired light distribution characteristics.

It is a perspective view of the lighting fixture concerning this embodiment. It is a longitudinal section of a light source unit which constitutes a lighting fixture concerning this embodiment. FIG. 2 is a perspective view of a lens unit according to the embodiment. It is a perspective view of the lens concerning this embodiment. It is a longitudinal section of the lens concerning this embodiment. FIG. 2 is a cross-sectional view of the lens according to the embodiment. FIG. 3 is a light distribution characteristic diagram of a lens according to the present embodiment displayed in polar coordinates. It is a sine isometric diagram of the lens concerning this embodiment. FIG. 9 is a light distribution characteristic diagram of a lens of a comparative example displayed in polar coordinates. FIG. 9 is a sine isometric diagram of a lens of a comparative example.

  A lens, a lens unit, and a lighting device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  First, the lighting fixture of the present embodiment will be described. The lighting fixture 8 of the present embodiment is a road lighting fixture (a road light). However, the lighting device may be a lighting device other than the road lighting device, for example, a security light or a street light.

  As shown in FIG. 1, the lighting fixture 8 of the present embodiment includes a plurality (three in the illustrated example) of light source units 3, a fixture main body 80, and an adapter 81. The adapter 81 is a component for mechanically connecting the fixture body 80 to the lighting pole 9.

  The device main body 80 includes a body 800 and an upper lid 801. The body 800 is formed in a flat rectangular box shape whose upper surface is opened by aluminum die casting. Further, the upper lid 801 is formed in a flat rectangular box shape whose lower surface is opened by aluminum die casting. Upper lid 801 is attached to body 800 so as to be rotatable between an open position where the opening of body 800 is opened and a closed position where the opening of body 800 is closed. The upper lid 801 is fixed to the closed position by screwing the left and right ends on the free end side to the body 800.

  A power supply unit, a terminal block, and the like are housed in the appliance body 80. The terminal block is electrically connected to a power supply line that is set up and wired in the lighting pole 9. The power supply unit is electrically connected to a power supply line via a terminal block. The power supply unit is configured to convert AC power supplied from a system power supply (commercial AC power supply) via a power supply line into DC power, and supply the DC power to a plurality of (three) light source units 3 respectively. Is done. The device main body 80 is attached to a tip portion of the lighting pole 9 via an adapter 81 (see FIG. 1).

  The light source unit 3 includes a light source unit 30, a unit body 31, a cover 32, and the like, as shown in FIGS. FIG. 2 is a cross-sectional view of one light source unit 3 in the vertical direction (the longitudinal direction of the lighting fixture 8 shown in FIG. 1). In the following description, the directions of front and rear, left and right, and up and down in FIG. 2 are defined. Specifically, the longitudinal direction of the light source unit 3 (the short direction of the lighting fixture 8) is the left-right direction, the short direction of the light source unit 3 (the longitudinal direction of the lighting fixture 8) is the front-back direction, and the height of the light source unit 3 is high. The vertical direction is the vertical direction (the height direction of the lighting fixture 8).

  The light source unit 30 includes a rectangular plate-shaped support member 301, a plurality of light-emitting diodes (LEDs 300) mounted on one surface (lower surface) of the support member 301, and the lens unit 2. The LEDs 300 are mounted on the lower surface of the support member 301 so as to be arranged at substantially equal intervals. Although not shown, a conductor (copper foil) for electrically connecting the LEDs 300 is formed on the lower surface of the support member 301.

  The lens unit 2 includes a large number (28 in the illustrated example) of lenses 1 for controlling the light distribution of the light emitted by the LED 300, and a rectangular plate-shaped substrate 20 that covers the lower surface of the support member 301 (FIGS. 2 and 5). 3). The lens 1 and the substrate 20 are integrally formed of a translucent material such as an acrylic resin or a polycarbonate resin. That is, the substrate 20 in the present embodiment corresponds to a connecting portion that connects the plurality of lenses 1. However, the material forming the lens unit 2 is not limited to a synthetic resin material having translucency, and may be quartz glass (silicon dioxide) or the like.

  The light source unit 30 is screwed to the lower surface of the unit main body 31 so that the support member 301 and the lens unit 2 overlap in the thickness direction (see FIG. 2).

  As shown in FIGS. 1 and 2, the unit main body 31 is formed in a plate shape having four sides by aluminum die casting, and a concave portion 310 is provided substantially at the center of the lower surface. Then, the light source unit 30 is attached to the bottom surface (upper surface) of the recess 310 by screwing. Further, the unit body 31 includes a plate-shaped connecting piece 311 protruding from a first side (back side) of the four sides, and a second side straddling the support member 301 and facing the first side. (A front side). Furthermore, the unit main body 31 is provided with substantially triangular prism-shaped side walls 313 on the remaining two sides (left side and right side). A plurality of radiating fins 314 are formed on the upper surface of the unit body 31 at equal intervals in the left-right direction. That is, when conducting the heat generated by the LEDs 300 of the light source unit 30 to the unit main body 31 and dissipating the heat, the heat dissipating property is improved by providing the plurality of heat dissipating fins 314.

  The cover 32 includes a light-transmitting plate 320, a frame 321 and a waterproof packing 322 as shown in FIGS. The light-transmitting plate 320 is formed in a rectangular flat plate shape using a material having a light-transmitting property (a synthetic resin material such as an acrylic resin or quartz glass). The frame 321 is formed in a rectangular frame shape by aluminum die casting.

  Then, the cover 32 is put on the lower surface of the unit main body 31, and is attached to the unit main body 31 by screwing the frame body 321 to the unit main body 31 (see FIG. 2). By attaching the cover 32 to the unit main body 31, the concave portion 310 of the unit main body 31 is sealed by the light transmitting plate 320 and the waterproof packing 322. The light emitted from the light source unit 30 is radiated out of the unit body 31 through the light transmitting plate 320.

  The three light source units 3 are fixed such that the connecting piece 311 of the central light source unit 3 overlaps with the step 312 of the rear light source unit 3, and the connecting piece 311 of the front light source unit 3 is connected to the central light source unit 3. Are fixed and connected so as to overlap with the step 312 of FIG. In the three connected light source units 3, the connection piece 311 of the light source unit 3 at the rear end is fixed to the front end of the instrument body 80 (see FIG. 1). The fixing of the light source units 3 and the fixing of the light source unit 3 and the instrument body 80 are preferably performed by, for example, screwing.

  Next, the lens 1 and the lens unit 2 of the present embodiment will be described in more detail.

  As shown in FIG. 3, the plurality of lenses 1 are provided on the surface of a rectangular flat substrate 20 so as to be arranged vertically and horizontally. However, the plurality of lenses 1 are arranged in one row of seven lenses, and are arranged on the surface of the substrate 20 so that four rows are parallel. The seven lenses 1 in each row are arranged at equal intervals. Further, the lenses 1 in each row are arranged between the lenses 1 in the adjacent rows in the arrangement direction of the rows. Further, on the surface of the substrate 20, four auxiliary lenses 21 are provided in parallel with the seven lenses 1 in each row. These four auxiliary lenses 21 are preferably formed, for example, in a triangular prism shape (see FIGS. 3 and 5).

  As shown in FIGS. 4 to 6, the lens 1 includes an entrance surface 10, a propagation unit 11, an exit surface 12, and a groove 13. In the following description, the vertical and horizontal directions of the lens 1 and the front and rear directions of the lens 1 are defined in FIG. That is, the longitudinal direction of the lens 1 is the left-right direction, the short direction of the lens 1 is the front-back direction, and the height direction of the lens 1 is the up-down direction.

  The incident surface 10 is configured to receive light emitted from the LED 300. The incident surface 10 is preferably formed in, for example, a paraboloid of revolution shape (see FIG. 5). The exit surface 12 is preferably formed in a smooth curved surface shape, for example, a semi-spindle shape (see FIG. 4). The propagation section 11 is made of a medium (synthetic resin, quartz, or the like) in a region surrounded by the entrance surface 10 and the exit surface 12 (see FIGS. 5 and 6). The lens 1 of the present embodiment is configured to diverge light emitted from the emission surface 12 in a wider range in the left-right direction than in the front-rear direction.

  As shown in FIGS. 4 and 6, the groove 13 is preferably formed so that the cross-sectional shape in the width direction (left-right direction) is V-shaped. In the lens 1 of the present embodiment, it is preferable that the groove portion 13 is provided at the center of the emission surface 12 in the longitudinal direction (lateral direction) and on the front side. The groove 13 is preferably formed to extend from a position in contact with the surface of the substrate 20 to a position near the zenith of the emission surface 12 (the lowest point of the emission surface 12) (see FIG. 5).

  As shown in FIGS. 1 and 2, the lens unit 2 of the present embodiment is configured such that the front and rear directions of the lens 1 and the lighting fixture 8 coincide with each other, and the front surface of the lens 1 provided with the groove 13 is positioned in front of the lighting fixture 8. (The road side) is attached to the unit main body 31.

  Here, most of the light that has propagated through the propagation unit 11 and has reached the groove 13 is totally reflected by the slope 130 (see FIG. 6) of the groove 13. Therefore, the light emitted from the position where the groove 13 is provided on the emission surface 12 is greatly reduced as compared with the case where the groove 13 is not provided. Therefore, the lens 1 of the present embodiment can reduce the luminous flux in a specific direction and range according to the position where the groove 13 is provided and the size of the groove 13 (width dimension, length dimension and depth dimension). .

  Here, FIGS. 7 and 8 show the results (light distribution curves) obtained by simulating the light distribution characteristics of the lens 1 in the lighting fixture 8 of the present embodiment. FIG. 7 is a diagram showing the light distribution characteristics of the lens 1 in polar coordinates, in which the moving radius corresponds to the luminous intensity and the deflection angle corresponds to the vertical angle θ. That is, the direction in which the vertical angle θ is 0 [° (degree)] is defined as vertical downward. FIG. 8 is a diagram showing a light distribution characteristic of the lens 1 in a sine isometric diagram.

  9 and 10 show light distribution curves of a comparative example of the lens 1 of the present embodiment (a configuration example in which the groove 13 is eliminated from the lens 1 of the present embodiment). FIG. 9 is a diagram showing the light distribution characteristics of the comparative example in polar coordinates, as in FIG. 7, and FIG. 10 is a diagram showing the light distribution characteristics of the comparative example in a sine isometric diagram similarly to FIG.

  8 and 10, the directions of the horizontal angles φ = 0 [°] and φ = 180 [°] are defined as the width direction of the road, and the directions of φ = 90 [°] and φ = 270 [°] are defined as road directions. (The direction in which vehicles and people pass). Further, it is assumed that φ = 0 [°] on the road side as viewed from the lighting fixture 8 and φ = 180 [°] on the opposite side of the road.

  7 and 9, the light distribution curves L1 at φ = 0 [°] and φ = 180 [°] are shown by solid lines, and the light distribution curves L2 at φ = 90 [°] and φ = 270 [°] are shown. This is indicated by a broken line. In FIGS. 7 and 9, the light distribution curve L3 at the horizontal angle φmax at which the luminous intensity is maximum is indicated by a two-dot broken line. Note that φmax in FIG. 7 is 60 [°], and φmax in FIG. 9 is 67 [°].

  Looking at the light distribution curve L1 in FIG. 9 and the light distribution characteristics in FIG. 10, the luminous intensity at an angle equal to or more than the vertical angle θ = 45 [°] on the road side is relatively large (the hatched area in FIG. 9). See). Light in such a range may cause light pollution over houses and the like existing around the road beyond the road.

  On the other hand, looking at the light distribution curve L1 of FIG. 7 and the light distribution characteristics of FIG. 8, the luminous intensity at an angle equal to or greater than the vertical angle θ = 45 [°] on the road side is the case of the comparative example (see FIGS. 9 and 10). Is significantly reduced. That is, in the lens 1 of the present embodiment, the groove 13 is provided at a position corresponding to the horizontal angle φ = 0 [°] and corresponding to the range of the vertical angle θ from 90 [°] to 45 [°]. Therefore, the light distribution curve L1 shown in FIG. 7 and the light distribution characteristics shown in FIG. 8 can be realized. The use of such a lens 1 has an advantage that the lighting fixture 8 of the present embodiment is less likely to cause light pollution to houses around the road.

  In the lens 1 of the present embodiment, the groove 13 is a V-shaped groove (a cross-sectional shape in the width direction is a V-shaped groove), but a groove having a shape other than the V-shaped groove, for example, a U-shaped cross-sectional shape. It may be a groove having a flat shape, a C shape or a flat bottom surface. However, when the bottom surface of the groove 13 facing the LED 300 is a flat surface or a curved surface, the amount of light that passes through the bottom surface and is emitted outside the lens 1 increases. Therefore, it is preferable that the groove portion 13 is constituted by a V groove.

  As described above, the lens 1 of the present embodiment includes the incident surface 10 on which the light emitted from the LED 300 (light source) is incident, the propagation unit 11 for transmitting the light incident on the incident surface 10, and the smooth curved surface. And an emission surface 12 for emitting the light that has propagated through the propagation unit 11 to the outside of the propagation unit 11. Further, the lens 1 of the present embodiment includes the groove 13. The groove 13 is formed so as to fall from the emission surface 12 into the propagation part 11.

  The lens 1 of the present embodiment is configured as described above, and can easily realize desired light distribution characteristics according to the position and size of the groove 13.

  Further, in the lens 1 of the present embodiment, it is preferable that the groove portion 13 is formed such that the cross-sectional shape in the width direction is V-shaped.

  If the lens 1 of the present embodiment is configured as described above, light emitted from the groove 13 can be reduced, and desired light distribution characteristics can be easily realized.

  The lens unit 2 of the present embodiment has a plurality of lenses 1 and a connecting portion (substrate 20) for connecting the plurality of lenses 1 to each other.

  The lens unit 2 of the present embodiment is configured as described above, and can easily achieve desired light distribution characteristics according to the position and size of the groove 13 of each lens.

  The lighting fixture 8 of the present embodiment includes a plurality of LEDs 300 (light sources), a lens 1 or a lens unit 2, and a fixture body 80 that supports the LEDs 300 and the lens 1 or the lens unit 2.

  The lighting fixture 8 of the present embodiment is configured as described above, and can easily realize desired light distribution characteristics according to the position and size of the groove 13 of the lens.

DESCRIPTION OF SYMBOLS 1 Lens 2 Lens unit 8 Lighting fixture 10 Incident surface 11 Propagation part 12 Emission surface 13 Groove part 20 Substrate (connection part)
80 Instrument body 300 Light emitting diode (light source)

Claims (2)

A plurality of lenses, a connecting portion for connecting the plurality of lenses, and an auxiliary lens parallel to the plurality of lenses;
Each of the plurality of lenses is
An incident surface on which light emitted from a corresponding one of the plurality of light sources is incident, a propagation unit that propagates the light incident on the incident surface, and a smooth curved surface, and propagates through the propagation unit. An emission surface for emitting the light to the outside of the propagation unit, and a groove,
The groove has a V-shaped cross-section in the width direction, and is formed so as to fall into the propagation section from the emission surface,
The groove further has a pair of slopes that fall into the propagation section from the emission surface , and is configured to totally reflect a part of light propagating through the propagation section at the pair of slopes , and In a direction perpendicular to the direction, is formed on a part of the emission surface,
The auxiliary lens is a lens unit which is characterized that you have been formed in a triangular prism shape. A lighting fixture comprising: a plurality of light sources; the lens unit according to claim 1; and a fixture main body that supports the plurality of light sources and the lens unit .

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