TW201819815A - Illuminating device characterized by suppressing the decrease of light emission from a lens cover plate to a diffusion cover plate, thereby having a high illuminating efficiency - Google Patents

Abstract

To provide a highly efficient illuminating device that suppresses the decrease of light emission from the lens cover plate to the diffusion cover plate. An illuminating device includes a substrate on which an LED light source is mounted, a lens portion covered with the LED light source and a lens cover plate connected to the connecting portion of the lens portion, and a diffusion cover plate having a curved surface and covered with the LED light source and the lens cover plate. The connecting portion has a flat portion and a concave portion, and the concave portion is located at the end of the lens.

Description

   Lighting device   

The present invention relates to a lighting device.

In recent years, LEDs (Light Emitting Diodes) have been increasingly used as light sources for lighting devices. As a light source for indoor lighting devices installed in the form of a zenith, LEDs are also used instead of fluorescent tubes. Furthermore, as the LED lighting device, directivity is given to the light emitted from the LED. Patent Documents 1 to 4 disclose optical systems that provide directivity to outgoing light from LEDs.

    [Prior technical literature]         [Patent Literature]    

[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

As a means for diffusing the light emitted from the LED to efficiently and brightly illuminate the entire diffusion cover, there is an illumination device using a lens cover having a lens shape corresponding to a plurality of LEDs arranged on a light source substrate. However, there must be a connection portion connecting the lens shape corresponding to the plurality of LEDs to the lens cover. In addition, in order to ensure the fluidity of the molding material, the connection portion must have a certain thickness. Therefore, a part of the light emitted from the LED is guided to the connection portion without being emitted from the lens to the diffusion cover, and the amount of light emitted from the lens cover to the diffusion cover is reduced.

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

In order to solve the above-mentioned problems, it is characterized by having 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 covering the LED light source and the lens cover, and A diffusion cover plate having a curved surface; the connecting portion has a flat portion and a concave portion; the concave portion is located at an end of the lens.

According to the present invention, it is possible to provide a highly efficient lighting device that suppresses a reduction in the amount of light emitted from the lens cover to the diffusion cover.

1‧‧‧LED lighting device

11‧‧‧ Backbone

11a‧‧‧ adapter mounting hole

12‧‧‧ adapter holder (insulation plate)

12a‧‧‧Fixed section

12b‧‧‧Cylinder

13‧‧‧Power supply substrate

13a‧‧‧Power connector

13b‧‧‧light source connector

14‧‧‧ heat sink

14a‧‧‧ Substrate Support Department

14b‧‧‧through hole

14c‧‧‧Ring

14d‧‧‧ standing wall

14e‧‧‧Wire through hole

14f‧‧‧Storage recess

14g‧‧‧outer wall

15‧‧‧LED light source substrate

15a‧‧‧wiring board

15b‧‧‧LED element group (LED element)

15b1‧‧‧White LED

15b2‧‧‧bulb color LED

15b3‧‧‧Blue LED

15b4‧‧‧Security Light LED

15c‧‧‧ prominence

15d‧‧‧Connect the head

15e‧‧‧Remote receiver

16‧‧‧ lens cover

16a‧‧‧Lens section

16a1‧‧‧ dome shaped part

16a2‧‧‧ lens surface

16a3‧‧‧ concave

16a4‧‧‧ convex

16b‧‧‧Connecting section

16b1‧‧‧through hole

16c‧‧‧Wall

16c1‧‧‧End

17‧‧‧ center cover

18‧‧‧ Lampshade

19‧‧‧Reflector

19a‧‧‧hole shape

20‧‧‧ Power Armor

21‧‧‧Light Armor

22‧‧‧ Bearing

23‧‧‧Decorative frame

24‧‧‧ Sensor Unit

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

FIG. 2 is an external perspective view showing a state when the LED lighting device is viewed from an oblique upward direction.

3 is an exploded perspective view showing a state when the LED lighting device is viewed from an obliquely downward direction.

FIG. 4 is a perspective view showing the LED lighting device with the lamp cover removed and a part of the LED cover as a cross section.

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

FIG. 6 is a diagram showing an example of an LED light source substrate.

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

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

The LED lighting device (LED ceiling lamp) according to the embodiment of the present invention will be described in detail while referring to the drawings as appropriate. However, in this embodiment, as an example of the LED lighting device 1, the structure of a circular shape in plan view is exemplified, but the shape is not limited to this. For example, it can be applied to many shapes such as a quadrangle, a hexagon, and an octagon. Angled Constructor. In this embodiment, an LED lighting device 1 using a light emitting diode (LED) as a main light source will be described below, but the main light source is not limited to the configuration of the LED.

The LED lighting device 1 shown in FIG. 1 and FIG. 2 is, for example, an installation and connection of an indoor wiring device (not shown) such as a suspension junction box and a suspension seal provided on a ceiling surface of a home. The device (not shown) is connected to an external power source and fixed to a specific position on the zenith surface for the user. The LED lighting device 1 is made of, for example, a nine-type or a corner type (it is a nine-type in this embodiment). However, in the following description, the state in which the LED lighting device 1 is mounted on the zenith surface will be used as a reference, and the upper side of the paper surface is the zenith side (upper side), and the lower side of the paper surface is the ground side (lower side).

As shown in FIG. 3, the LED lighting device 1 includes: a backbone 11, an adapter receiving portion 12 (insulating plate), a power supply substrate 13, a heat sink 14, an LED light source substrate 15, a lens cover 16, and a center cover 17. , A lampshade 18, a decorative frame 23, a sensor unit 24, and the like.

The backbone 11 is a base member in which a steel plate (for example, SECC (Electro-galvanized steel plate)) is formed into a substantially circular shape, and the concave surface is formed into a slightly concave shape (disc) toward the ground side. In addition, the center of the backbone 11 is formed with an adapter mounting hole 11a for engaging and mounting an adapter (not shown).

The adapter receiving portion 12 (insulating plate) is formed of a synthetic resin (for example, PP: polypropylene resin) having flame retardance and electrical insulation, and has a ring-shaped fixing fixed to the bottom of the backbone 11 A portion 12a and a cylindrical portion 12b extending from the ground side (below) from the inner peripheral edge portion of the fixed portion 12a.

As shown in FIG. 3, the power source board 13 includes a lighting circuit including a control unit, and is bolted to the backbone 11 via the adapter receiving unit 12 (insulating plate). As a result, the power supply substrate 13 is arranged in a heat radiation space surrounded by the backbone 11 and a heat radiation plate 14 described later, while maintaining electrical insulation.

In addition, the power substrate 13 is electrically connected to a mounting adapter (not shown) through a power armor 20 connected to a power connector 13a fixed below the power substrate 13.

The light source connector 13 b is configured to connect the power source substrate 13 and the LED light source substrate 15 by the light source armor 21.

As a result, the LED lighting device 1 is constituted by supplying power to the indoor wiring apparatus (not shown), mounting adapters (not shown), a power source armor 20, a light source armor 21, and a power source substrate 13, respectively. .

The heat radiating plate 14 is a metal member that cools the heat of the power supply substrate 13 that emits heat during operation, and the LED light source substrate 15 on which a plurality of LEDs are mounted to perform cooling. The LEDs of the LED element group 15b described later have a property of being weak against heat. In addition, when LEDs are used, high-intensity light emission is caused by a large current flowing at a low voltage, and the LED itself or surrounding components are degraded due to the heat generated by this light emission. This is achieved by suppressing this degradation. long life. High reliability requires proper heat dissipation.

The heat radiating plate 14 has a structure in which a steel plate is formed into a substantially circular shape, and a truncated cone-shaped substrate supporting portion 14a is formed so as to protrude from the ground side. In addition, the heat radiation plate 14 is made of, for example, a metal having good thermal conductivity such as a galvanized steel sheet, and is seamlessly integrally formed through extension processing to improve strength. In addition, the heat dissipation plate 14 is formed to have a larger diameter than the backbone 11, and is attached to the backbone 11 so as to protrude outward from the radial direction than the backbone 11. The heat radiating plate 14 is located on the lower side of the heat radiating plate 14, and the LED light source substrate 15 is disposed with a plurality of LED elements (LED element group 15 b) of the main light source irradiating light in a downward direction. As a complement, the LED light source substrate 15 is arranged on the lower surface side of the heat sink 14 and is added to the lower surface.

However, the radial center of the heat dissipation plate 14 is formed at a position corresponding to the cylindrical portion 12 b of the adapter receiving portion 12, and a circular through hole 14 b is formed. In addition, the outer peripheral portion of the heat radiating plate 14 includes an annular portion 14 c formed into a horizontal circular shape, and a standing wall portion 14 d formed on the outer peripheral portion of the annular portion 14 c. The lower surface of the annular portion 14c is mounted at three intervals at intervals of 120 ° so as to hang the holders 22 (see FIG. 3) of the lamp cover 18 described later.

As shown in FIG. 4, the electric wire insertion hole 14 e is formed as a through hole that is opened toward the upper side of the heat dissipation plate 14 and is perforated in an outer peripheral wall 14 g of the storage recessed portion 14 f formed in an inclined recessed shape. A plurality of light source armors 21 are wired to the wire insertion hole 14e.

The storage recess 14f is provided with a storage space for connecting the power source armor 20 and the light source armor 21 to the power source substrate 13 (see FIG. 5).

The LED light source substrate 15 includes a ring-shaped wiring substrate 15a which is disposed by interposing the heat dissipation plate 14 on the lower side of the backbone 11 and is concentrically arranged in a concentric circle shape by soldering on one side of the wiring substrate 15a. The (ground-side) LED element group 15b of the plurality of LEDs as the main light source is configured (see FIG. 3). However, the details of the LED element group 15b will be described later.

The wiring substrate 15a is, for example, formed by forming an insulating layer and a metal plate having a substantially annular shape made of aluminum alloy with a copper foil pattern, or by forming a copper foil pattern with a solder resist equal to a resin having good thermal conductivity (for example, Polyimide resin, etc.).

In this embodiment, when the backbone 11 and the heat dissipation plate 14 are provided as described above, the volume of the heat dissipation space is increased (the amount of air in the heat dissipation space is increased), and the power source substrate 13 and the LED light source substrate 15 are radiated. Improved efficiency. As a result, the light emitting efficiency of the LED element group 15b can be improved.

The LED light source substrate 15 shown in FIG. 6 is an example of an array pattern of 14-layer LEDs. The LED element group 15b includes a plurality of white light-emitting LEDs (light emitting diodes) 15b1 that emit white (D color) light, and a plurality of light bulb-colored LEDs 15b2 that emit light (L color). A plurality of blue LEDs 15b3 and a security light LED15b4 constitute the main light source. In addition, the outer peripheral end of the LED light source substrate 15 has a slightly arc-shaped protruding piece 15c protruding toward the outside and two connecting portions 15d connected to the light source armor 21 mounted on the protruding piece 15c. And remote control light receiving unit 15e.

The white LED 15b1 has a peak wavelength of 430 nm to 460 nm, and is arranged in a plurality of rows (for example, 8 rows) in a concentric circle from the outer peripheral side to the inner peripheral side.

The bulb-colored LED 15b2 has a peak wavelength of 550 nm to 650 nm, and in a plurality of columns arranged in a concentric circle, the white-color LED 15b1 is sandwiched therebetween and arranged. That is, the bulb-colored LEDs 15b2 are arranged in the concentric circles, and two white-colored LEDs 15b1 are sandwiched therebetween in the circumferential direction. However, this embodiment is also included, and the arrangement relationship between the white-color LED 15b1 and the bulb-color LED 15b2 may not have regularity. In addition, the white LED 15b1 and the light bulb LED15b2 are arranged in concentric circles, and are arranged at equal intervals or at approximately equal intervals in the circumferential direction.

The blue LED 15b3 has a peak wavelength of 470 nm to 480 nm. The white LED 15b1 and the bulb-color LED 15b2 are arranged in a plurality of rows in a concentric circle, and are arranged at intervals in the circumferential direction. Configured as a ring. In the embodiment of FIG. 6, the rows in which the blue LEDs 15 b 3 are arranged are arranged from the ring-shaped center to the concentric circles in the second and fourth rows.

The LED element group 15b shown in FIG. 6 is configured by, for example, 168 white light LEDs 15b1, 76 light bulb color LEDs 15b2, and 32 blue LEDs 15b3. The number of blue LEDs 15b3 is preferably about 10% of the total of the white LED15b1 and the bulb LED15b2.

However, the heat radiating plate 14 is subjected to reflection coating by reflecting the light radiated from the LED element group 15b to the white paint on the ground side. In this embodiment, in order to further improve the reflection efficiency, the surface (ground side) of the LED light source substrate 15 is provided with a hole shape 19a that avoids the LED element group 15b and has the same number of holes as the LED element group 15b. As a reflection sheet 19 of a highly reflective member, as a result, the light radiated from the LED element group 15b is more efficiently reflected by the lampshade 18, and uneven light emission of the lampshade 18 is suppressed while contributing to higher efficiency. However, the reflectance of the reflection sheet 19 is preferably 90% or more.

As shown in FIG. 5, the lens cover 16 sandwiches the LED light source substrate 15 and the reflection sheet 19 and presses the substrate support portion 14 a of the heat sink 14. In order to hold it, the lens cover 16 is bolted to the heat sink 14. As a result, the adhesion between the one surface (upper surface side) of the LED light source substrate 15 and the substrate supporting portion 14a is improved.

The lens cover 16 is composed of a plurality of lens portions 16 a arranged corresponding to the LED element group 15 b and a flat connection portion 16 b that joins the plurality of lens portions 16 a. In this embodiment, the composition of one LED is housed in one lens portion 16a, but the number of LEDs housed in the lens portion 16a is not limited to this. For example, among the two LEDs arranged in one lens portion 16a, one is a white LED 15b1, and the other is a bulb LED 15b2.

A wall portion 16c is formed on the outer peripheral portion of the connection portion 16b so as to be formed substantially orthogonal to the upper surface side. In this embodiment, the end surface of the wall portion 16c is formed so as to touch the outer peripheral wall 14g of the inclined surface shape of the heat sink plate 14. As a result, it is not necessary to extend the wall portion 16c to the upper surface side up to the annular portion 14c of the heat dissipation plate 14, and to reduce the cost of the molding material, the LED light source substrate 15 and the reflection sheet 19 can be incorporated.

The lens cover 16 is integrally formed by, for example, injection molding using a light-transmitting and electrically insulating resin having polystyrene (PS), polycarbonate (PC), acrylic (PMMA), or the like. Especially in terms of transparency, cost, and moldability, it is preferable to use polystyrene. The material used for the lens cover 16 is not limited to resin as long as it has a light-transmitting and electrically insulating structure, and may be glass or the like.

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

The lampshade 18 is a light-transmitting cover plate (for example, acrylic, polystyrene, or the like) made of resin (for example, acrylic, polystyrene, or the like) having a light-transmitting property (transparent, translucent, or containing milky white), and is formed in a dome shape. The lampshade 18 functions to diffuse the light beam emitted from the light source (LED element group 15b), reduce the brilliance of the user when looking directly at the LED lighting device 1, and uniformize the brightness of the space in which the LED lighting device 1 is installed. The lampshade 18 is detachably attached and held via a holder 22 mounted on the heat sink 14.

The decorative frame 23 is configured to hold the inner peripheral side of the ring portion to the outer peripheral side of the lampshade 18 made of a light-transmitting material, and the outer peripheral side of the ring portion is configured to protrude outward from the outer periphery of the lampshade 18 (see FIG. 3). The decorative frame 23 is formed of a material having light transmittance.

As shown in FIG. 2 and FIG. 3, the sensor unit 24 provides, for example, a change in power supplied to the LED element group 15 b according to the brightness of the environment (space) in which the LED lighting device 1 is installed. A function of obtaining a certain illuminance under the lighting device 1. In addition, 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, the surface of the wiring substrate 15a facing the lens portion 16a 'is formed so as to cover each of the LED element groups 15b, and a dome-shaped portion 16a'1 having a smooth surface is formed.

When the light radiated from the LED element group 15b is, for example, θa1, the light incident from the surface of the dome-shaped portion 16a'1 into the lens portion 16a 'is diffused by the lens effect, and then passes through the smooth lens surface portion 16a. '2 The light θa2 emitted to the lampshade 18. However, similarly, a part of the light θb1 irradiated from the LED is a light ray θb2 that is guided from the light to the connection portion 16b '. In addition, the light beam θb2 as a light guide is emitted from the end portion 16c'1, which is the wall portion 16c ', and the like, and causes light unevenness when irradiated to the lamp cover 18.

As shown in FIG. 8, the surface of the wiring substrate 15 a facing the lens portion 16 a is formed so as to cover each of the LED element groups 15 b, and a dome-shaped portion 16 a 1 having a smooth surface is formed.

When the light radiated from the LED element 15b is, for example, θa1, the light incident from the surface of the dome-shaped portion 16a1 into the lens portion 16a is diffused by the lens effect, and then emitted from the smooth lens surface portion 16a2 to the lamp cover 18 Ray of light θa2.

Here, unlike the lens portion 16a 'shown in FIG. 7, as shown in FIG. 8, in this embodiment, the concave portion 16a3 may be formed on the outer edge portion of the lens surface portion 16a2 side of the lens portion 16a. The light ray θb1 that is guided by the light radiated from the LED element 15b to the connection portion 16b and is lost is used as the light ray θa2. That is, the light from the LED element 15b can be efficiently emitted to the lampshade 18, and as a result, high-beam and high-efficiency product development can be achieved.

When considering the fluidity of the material when the lens cover 16 is formed by injection molding, when the concave portion 16a3 is provided on the outer edge portion of the lens portion 16a and the material flows from the connection portion 16b to the lens portion 16a, the thickness changes. narrow. As a result, there is a possibility of forming defects such as sink marks when forming the lens portion 16a. However, in this embodiment, the outer edge portion of the wiring substrate 15a side facing the dome-shaped portion 16a1 is surrounded by the installation. For the convex-shaped portion 16a4 formed on the LED element 15b, countermeasures are taken to prevent formation defects through thinning. The plurality of LED elements 15b are uniformly fixed through the convex-shaped portions 16a4 provided around the LED elements 15b, and are not easily affected by the deformation of the LED light source substrate 15 through which the lens cover 16 and the LED elements 15b are mounted.

A minute gap d is provided between the wiring substrate 15a (and the reflection sheet 19) facing the connection portion 16b (see FIG. 8). This is to avoid a component mounted on the wiring substrate 15a (for example, a jumper element mounted on a wiring pattern, etc.). The convex portion 16a4 also has the function of pressing the wiring substrate 15a and the reflection sheet 19 with the outer periphery of the LED element 15b when the lens cover 16 is assembled on the substrate supporting portion 14a, so that the wiring substrate 15a and the substrate supporting portion 14a In addition to improving the adhesion, the outer edge portion of the cavity shape 19a of the reflection sheet 19 provided near the LED element 15b and the convex portion 16a4 can be used to suppress the reflection by the bending of the reflection sheet 19 and the like. The light unevenness or shadow of the lampshade 18 generated by the light radiated from the LED element 15b, and the decrease in the light beam value.

Claims (2)

    An illuminating 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 connecting portion connecting the lens portion, and a lens cover covering the LED light source and the lens cover. A curved diffusion cover; the connecting portion has a flat portion and a concave portion; the concave portion is located at an end of the lens.         The illuminating device described in item 1 of the scope of patent application, wherein the outer edge portion facing the substrate side of the lens has a convex portion provided around the LED light source.