CN107781735A - Lighting device - Google Patents

Abstract

The present invention provides a high-efficiency lighting device that suppresses a decrease in the amount of light emitted from a lens cover to a diffuser cover. The lighting device includes: a substrate on which an LED light source is mounted; a lens cover having a lens portion covering the LED light source and a connection portion connecting the lens portion; and a diffuser cover with a curved surface covering the LED light source and the lens cover, the connection The portion has a flat portion and a concave portion located at an end portion of the lens.

Description

lighting device

technical field

The present invention relates to lighting devices.

Background technique

In recent years, LEDs (Light Emitting Diodes, light emitting diodes) are increasingly used as light sources of lighting devices. LEDs have also begun to be used instead of fluorescent tubes as light sources for indoor lighting devices of the ceiling-mounted type. Furthermore, LED lighting devices may provide directivity to emitted light from LEDs. In Patent Document 1 to Patent Document 4, optical systems for directing light emitted from LEDs are disclosed.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2014-154461

Patent Document 2: Japanese Patent Laid-Open No. 2014-135233

Patent Document 3: Japanese Patent Laid-Open No. 2011-204397

Patent Document 4: Japanese Patent Laid-Open No. 2013-145685

Contents of the invention

The technical problem to be solved by the invention

There is an illumination device that uses a lens cover having a lens shape corresponding to a plurality of LEDs arranged on a light source board as means for diffusing light emitted from the LEDs to efficiently illuminate the entire diffusion cover. However, the lens cover requires a connecting portion that connects lens shapes corresponding to a plurality of LEDs, and the connecting portion needs to have a certain thickness in order to ensure flowability of the molding material. Therefore, part of the light emitted from the LED is not emitted from the lens to the diffuser cover but guided to the connection portion, and the amount of light emitted from the lens cover to the diffuser cover is reduced.

An object of the present invention is to provide a lighting device that suppresses a decrease in the amount of light emitted from a lens cover to a diffuser cover.

In order to solve the above-mentioned problems, the present invention is characterized in that it includes: a substrate on which an LED light source is mounted; a lens cover having a lens portion covering the LED light source and a connection portion connecting the lens portion; and a curved surface covering the LED light source and the lens cover. The diffuser cover, the connecting part includes a flat part and a concave part; the concave part is located at the end of the lens.

According to the present invention, it is possible to provide a high-efficiency lighting device that suppresses a decrease in the amount of light emitted from the lens cover to the diffusion cover.

Description of drawings

FIG. 1 is a diagram showing an LED lighting device according to an embodiment of the present invention, and is a perspective view showing an appearance when viewed obliquely from below.

Fig. 2 is an external perspective view showing a state in which the LED lighting device is viewed obliquely from above.

Fig. 3 is an exploded perspective view showing a state in which the LED lighting device is viewed obliquely from below.

Fig. 4 is a perspective view of the LED lighting device in which a shade is removed and a part of the LED cover is shown in section.

Fig. 5 is a part of the central longitudinal sectional view of the LED lighting device with the lampshade removed.

Fig. 6 is a diagram showing an example of an LED light source board.

Fig. 7 is an enlarged view of part A of Fig. 5 .

FIG. 8 is an enlarged view of part A of FIG. 5 , showing the present embodiment.

Symbol Description

1...LED lighting device

11...Support backbone

11a...Adapter mounting holes

12...Adapter support (insulation plate)

12a...fixed part

12b...Cylindrical part

13...power board

13a...power connector

13b...Light source connector

14...Heating plate

14a... Substrate supporting part

14b...Through hole

14c...Annulus

14d...Vertical wall

14e...Electric wire through hole

14f...Accommodating concave part

14g...Peripheral wall

15...LED light source substrate

15a... Wiring board

15b...LED element group (LED element)

15b1...daylight color LED

15b2...Incandescent color LED

15b3...Blue LED

15b4...Security light LED

15c... protruding piece

15d...Connector part

15e……The light-receiving part of the remote control

16...Lens cover

16a...Lens part

16a1...Dome shape part

16a2...Lens surface part

16a3... Concave part

16a4...Convex part

16b...connecting part

16b1...Through hole

16c...Wall

16c1...end

17...Central cover

18...Shade

19...reflector

19a... Hole shape

20...Power harness

21...Light source wiring harness

22...support

23...decorative frame

24...sensor unit

Detailed ways

The LED lighting device (LED ceiling lamp) according to the embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In this embodiment, as an example of the LED lighting device 1 , a circular lighting device in plan view is taken as an example for description, but the shape is not limited thereto, and it can also be applied to a quadrangle, a hexagon, or an octagon, for example. Isometric lighting fixtures. In addition, in this embodiment, although the LED lighting device 1 using a light emitting diode (LED) as a main light source is demonstrated below, a main light source is not limited to LED.

The LED lighting device 1 shown in FIG. 1 and FIG. 2 is, for example, connected to an indoor wiring device (not shown) such as a pendant light box or a ceiling junction box installed on the ceiling surface of a house (not shown). shown), connected to an external power source and fixed at a specified position on the ceiling for use. The LED lighting device 1 is, for example, circular or square (circular in this embodiment). In addition, in the following description, the upper side on the paper is the ceiling side (top side) and the lower side on the paper is the floor side (lower side) based on the state where the LED lighting device 1 is mounted on the ceiling.

As shown in FIG. 3 , the LED lighting device 1 has a support backbone 11, an adapter support portion 12 (insulating plate), a power supply substrate 13, a heat dissipation plate 14, an LED light source substrate 15, a lens cover 16, a central cover 17, and a shade 18. , a decorative frame 23, a sensor unit 24 and the like.

The support frame 11 is a substantially circular base member processed and formed from a steel plate (for example, SECC (electro-galvanized steel sheet)), and is formed in a substantially concave shape (disk shape) so that the concave surface faces the floor side. In addition, an adapter mounting hole 11 a for locking and mounting an adapter (not shown) is formed at the center of the support frame 11 .

The adapter supporting part 12 (insulating plate) is formed with a synthetic resin (such as PP: polypropylene resin etc.) The inner peripheral portion of the fixed portion 12a is a cylindrical portion 12b extending toward the floor side (downward).

As shown in FIG. 3 , the power supply board 13 has a lighting circuit including a control unit, and is fixed to the supporting body 11 with bolts via the adapter supporting portion 12 (insulating plate). As a result, the power supply board 13 is arranged in a heat dissipation space surrounded by the support backbone 11 and the heat dissipation plate 14 described later, while maintaining electrical insulation.

The power board 13 is electrically connected to a mounting adapter (not shown) via a power harness 20 connected to a power connector 13 a fixed to the lower surface of the power board 13 .

The light source connector 13 b is used to connect the power supply board 13 and the LED light source board 15 through the light source wire harness 21 .

Thus, the LED lighting device 1 is configured to supply power via an indoor wiring device (not shown), an installation adapter (not shown), the power harness 20 , the light source harness 21 , and the power board 13 .

The heat dissipation plate 14 is a metal member that functions to dissipate heat from the power supply substrate 13 that generates heat during operation and the LED light source substrate 15 on which a plurality of LEDs are mounted, and cool them down. The LEDs of the LED element group 15b described later have a property of being weak in heat resistance. In addition, LEDs emit light with high luminance by flowing a large current at a low voltage during use, so the heat generated by the light emission degrades the LED itself and surrounding components. Therefore, in order to suppress this deterioration and achieve long life and high reliability, Proper cooling is required.

The radiator plate 14 is formed by processing a steel plate into a substantially circular shape, and has a truncated cone-shaped substrate support portion 14 a protruding toward the floor side. In addition, the radiator plate 14 is made of, for example, a metal having good thermal conductivity such as a galvanized steel sheet, and is formed integrally without a joint by applying a drawing process to improve strength. In addition, the radiator plate 14 is formed to have a larger diameter than the supporting body 11 , and is attached to the supporting body 11 so as to protrude radially outward from the supporting body 11 . The LED light source board 15 is arranged on the lower surface of the heat sink 14 so that a plurality of LED elements (LED element groups 15 b ) of the main light source irradiate light downward. In addition, the LED light source board 15 is arranged on the lower surface side of the heat dissipation plate 14 along (adhering to) the lower surface.

In addition, a circular through-hole 14 b is formed at a position corresponding to the cylindrical portion 12 b of the adapter support portion 12 at the center in the radial direction of the heat sink plate 14 . Moreover, the outer peripheral part of the heat dissipation plate 14 has the circular annular part 14c formed horizontally, and the vertical wall part 14d formed in the outer peripheral part of the annular part 14c. On the lower surface of the annular portion 14c, three supports 22 for locking a lamp shade 18 described later are attached at 120° intervals (refer to FIG. 3 ).

As shown in FIG. 4 , the wire insertion hole 14e is formed by a through hole pierced in an outer peripheral wall 14g of a housing recess 14f formed in a concave shape inclined so as to expand upward of the radiator plate 14. . A plurality of light source harnesses 21 are arranged in the wire insertion hole 14e.

The storage recess 14f is a storage space in which the power supply substrate 13 to which the power supply harness 20 and the light source harness 21 are connected is provided (see FIG. 5 ).

The LED light source substrate 15 includes: a ring-shaped wiring substrate 15a arranged through the heat dissipation plate 14 on the lower side of the supporting backbone 11; The LED element group 15b (refer to FIG. 3 ) of the main light source of a plurality of LEDs arranged in a shape. However, the details of the LED element group 15b will be described later.

The wiring board 15a is constituted, for example, by forming an insulating layer and a copper foil pattern on a substantially ring-shaped metal plate made of aluminum alloy, or by forming a copper plate on a flat plate of a resin having good thermal conductivity (for example, polyimide resin, etc.). foil pattern, solder resist, etc.

In this embodiment, by having the supporting backbone 11 and the heat dissipation plate 14 of the above-mentioned structure, the volume of the heat dissipation space is increased (the amount of air in the heat dissipation space is increased), and the heat dissipation efficiency of the power supply substrate 13 and the LED light source substrate 15 is realized. improvement. As a result, the luminous efficiency of the LED element group 15b can be improved.

The LED light source board 15 shown in FIG. 6 shows an example of an arrangement pattern of LEDs for 14 mats (14 tatami mats). The LED element group 15b includes: a plurality of daylight color LEDs (Light Emitting Diode) 15b1 emitting light of daylight color (D color); a plurality of incandescent color LEDs 15b2 emitting light of incandescent light color (L color); and a plurality of light emitting diodes emitting blue light. A blue LED15b3; and a security light LED15b4 to form the main light source. In addition, at the outer peripheral end of the LED light source board 15, there are: a protruding piece 15c formed to protrude outward in a substantially arc shape; two connector parts 15d mounted on the protruding piece 15c and connected to the light source harness 21; and a remote controller. Light receiving unit 15e.

The peak wavelength of daylight color LED15b1 is 430nm-460nm, and it arrange|positions concentrically in multiple rows (for example, 8 rows) from the outer peripheral side to the inner peripheral side.

The peak wavelength of the incandescent color LED15b2 is 550nm-650nm, and it arrange|positions so that daylight color LED15b1 may be sandwiched in each row which arrange|positioned concentrically in several rows. That is, the incandescent color LED15b2 is arrange|positioned on both sides of two daylight color LED15b1 in the circumferential direction in each concentric circle shape LED15b2. However, including this embodiment, the arrangement number relationship of daylight color LED15b1 and incandescent light color LED15b2 does not need to have regularity. Moreover, daylight color LED15b1 and incandescent light color LED15b2 are arrange|positioned at equal intervals or substantially equal intervals in the circumferential direction in each concentric row.

The blue LED 15b3 has a peak wavelength of 470nm to 480nm, and is arranged in a ring at intervals in the circumferential direction between the outermost circumference and the innermost circumference of the daylight color LED 15b1 and the incandescent color LED 15b2 arranged concentrically. shape. In the embodiment shown in FIG. 6 , the rows in which the blue LEDs 15b3 are arranged are concentrically arranged in the second row and the fourth row from the ring-shaped center.

The LED element group 15b shown in FIG. 6 is composed of, for example, 168 daylight color LEDs 15b1, 76 incandescent color LEDs 15b2, and 32 blue LEDs 15b3. It is preferable that the number of blue LED15b3 is about 10% of the total number of daylight color LED15b1 and incandescent color LED15b2.

In addition, reflective coating is performed on the radiator plate 14 with white paint that reflects light irradiated from the LED element group 15b toward the floor side. In this embodiment, in order to further improve the reflection efficiency, on the surface (floor side) of the LED light source substrate 15, there is a reflection sheet 19 as a high reflection member in a manner to avoid the LED element group 15b. The same number of hole shapes 19a in the group 15b results in more efficient reflection of light irradiated from the LED element group 15b toward the globe 18, thereby suppressing uneven light emission of the globe 18 and contributing to improvement in efficiency. In addition, it is preferable that the reflectance of the reflection sheet 19 is 90% or more.

As shown in FIG. 5 , the lens cover 16 is pressed against the substrate supporting portion 14 a of the heat sink 14 via the LED light source substrate 15 and the reflection sheet 19 . For compression, the lens cover 16 is bolted to the cooling plate 14 . Thereby, the degree of adhesion (degree of adhesion) between one surface (upper surface side) of the LED light source board 15 and the board support portion 14a is improved.

The lens cover 16 is comprised by the several lens part 16a arrange|positioned corresponding to the LED element group 15b, and the flat connection part 16b which mutually connected the some lens part 16a. In this embodiment, one LED group is accommodated in one lens portion 16a, but the number of LEDs accommodated in the lens portion 16a is not limited thereto. For example, in the group of two LEDs arrange|positioned in the one lens part 16a, one is daylight color LED15b1, and the other is incandescent color LED15b2.

On the outer peripheral portion of the connecting portion 16b, a wall portion 16c is formed so as to be substantially perpendicular to the upper surface side (top surface side). In this embodiment, the end surface of the wall part 16c is formed so that it may contact the slope-shaped outer peripheral wall 14g of the heat sink 14. As shown in FIG. Thereby, it is not necessary to extend the wall portion 16c to the annular portion 14c of the heat sink 14 on the upper side, and the molding material cost can be reduced, and the LED light source board 15 and the reflection sheet 19 can be housed inside.

The lens cover 16 is integrally molded, for example, by injection molding or the like, using a resin having translucency and electrical insulation properties such as polystyrene (PS), polycarbonate (PC), polymethyl methacrylate (PMMA), or the like. In particular, polystyrene is preferably used in terms of transparency, cost, and formability. In addition, the material used for the lens cover 16 is not limited to resin as long as it has translucency and electric insulation, and glass etc. may be sufficient as it.

The center cover 17 covers an attachment adapter (not shown) exposed at the center of the device main body, and is formed of, for example, a flame-retardant synthetic resin (eg, PP: polypropylene resin). In addition, the central cover 17 is formed in a disc shape, and is detachably attached to a circular through-hole 16 b 1 formed in the center portion in the radial direction of the lens cover 16 .

The shade 18 is a translucent cover made of a translucent (including transparent, translucent, or milky white) resin (for example, polymethylmethacrylate, polystyrene, etc.), and is configured in a dome shape. The lampshade 18 diffuses the light beam emitted from the light source (LED element group 15b), reduces the glare (glare) feeling when the user looks directly at the LED lighting device 1, and makes the brightness of the space where the LED lighting device 1 is installed uniform. . The globe 18 is detachably engaged and held by a support 22 attached to the radiator plate 14 .

The decorative frame 23 is configured such that the inner peripheral side of the annular portion is held on the outer peripheral side of the lampshade 18 made of a light-transmitting material, and the outer peripheral side of the annular portion protrudes outward from the outer periphery of the lampshade 18 (see FIG. 3 ). . The decorative frame 23 is formed of a translucent material.

As shown in FIGS. 2 and 3 , the sensor unit 24, for example, changes the power supply to the LED element group 15b corresponding to the brightness of the environment (space) in which the LED lighting device 1 is installed, so that a certain amount of light is obtained under the LED lighting device 1. function of illuminance. And, the illuminance under the LED lighting device 1 is detected.

Next, the lens portion 16a of the lens cover 16 according to the embodiment of the present invention will be described in detail.

As shown in FIG. 7 , a dome-shaped portion 16 a ′ 1 having a smooth surface is formed on a surface of the lens portion 16 a ′ facing the wiring board 15 a so as to cover the LED element groups 15 b respectively.

Let the light irradiated from the LED element 15b be, for example, θa1, enter the lens 16a' from the surface of the dome-shaped part 16a'1, diffuse it by the lens effect, and then become 2 pairs of light θa2 emitted by the lampshade 18. However, similarly, part of the light θb1 irradiated from the LED is guided to the connecting portion 16b', and becomes lost light θb2. In addition, the light ray θb2 of the light guide is emitted from the end portion 16c′ 1 of the wall portion 16c ′, etc., and becomes a cause of light unevenness when irradiating the globe 18 .

As shown in FIG. 8 , dome-shaped portions 16 a 1 having a smooth surface are formed on the surface of the lens portion 16 a facing the wiring board 15 a so as to cover the LED element groups 15 b respectively.

Let the light irradiated from the LED element 15b be, for example, θa1, enter into the lens portion 16a from the surface of the dome-shaped portion 16a1, diffuse it by the lens effect, and then become a light beam from the smooth lens surface portion 16a2 to the lampshade. 18 the outgoing light θa2.

Here, unlike the lens portion 16a' shown in FIG. 7, as shown in FIG. The light irradiated from the LED element 15b is guided to the connection portion 16b and the lost light θb1 is used as the light θa2. That is, the light from the LED element 15b can be emitted to the globe 18 efficiently, and as a result, a large light beam and a high-efficiency product can be developed.

Considering the fluidity of the material when the lens cover 16 is formed by injection molding, the concave portion 16a3 is provided on the outer edge of the lens portion 16a, so that the thickness of the material becomes small when flowing from the connection portion 16b to the lens portion 16a. As a result, molding defects such as dents may occur when forming the lens portion 16a. By forming the convex portion 16a4, a countermeasure against molding failure due to thinning is taken. The plurality of LED elements 15b are uniformly fixed by the convex portion 16a4 provided so as to surround the LED elements 15b, making it less susceptible to deformation of the lens cover 16 and the LED light source board 15 on which the LED elements 15b are mounted.

A slight gap d is provided between the wiring board 15a (and the reflective sheet 19 ) facing the connection portion 16b (see FIG. 8 ). This is to avoid components mounted on the wiring board 15a (for example, jumper elements mounted to go over the wiring pattern, etc.). The convex part 16a4 also has the function of pressing the wiring board 15a and the reflection sheet 19 with the outer peripheral part of the LED element 15b when the lens cover 16 is mounted on the board supporting part 14a. In addition, by pressing the outer edge of the hole shape 19a on the reflective sheet 19 near the LED element 15b with the convex portion 16a4, it is possible to prevent the light irradiated from the LED element 15b from being blocked due to warping of the reflective sheet 19, etc. The light unevenness and shadow of the resulting lampshade 18 and the reduction of the beam value.

Claims (2)

1. A kind of 1. lighting device, it is characterised in that：

   Including：The substrate of LED light source is installed；With the lens section for covering the LED light source and the connecting portion for connecting the lens section Lens cap；With the diffused reflector with curved surface for covering the LED light source and the lens cap,

   The connecting portion includes flat part and concave shaped portion,

   The concave shaped portion is located at the end of the lens.
2. 2. lighting device as claimed in claim 1, it is characterised in that：

   In the outer edge of the side relative with the substrate of the lens, have and set in a manner of surrounding the LED light source Male portion.