JP2013206752A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device in which light emitting elements are arranged in a ring form, in which light and dark parts of a cover part are suppressed and illumination can be uniformalized.SOLUTION: In a lighting device, a light source cover member 4 for covering light emitting elements 22 is made thick and inclined and, thereby, light from the light emitting elements 22 arranged in a ring form with a simple structure without using an additional member such as a lens can be irradiated effectively in a central direction of a cover member 4, and, as a result, uniform luminance and illuminance at a cover member face can be obtained.

Description

  Embodiments described herein relate generally to a lighting device using a light emitting element having high directivity such as an LED as a light source.

  2. Description of the Related Art Conventionally, in a general residential lighting fixture, an annular fluorescent lamp is used as a main light source, and a cover member (sade) is provided so as to cover the lower side of the annular fluorescent lamp, so that the external shape is configured in a round shape. Things are prevalent.

  On the other hand, recently, with the increase in output, efficiency, and widespread use of light emitting elements such as LEDs, lighting fixtures that can be expected to have a long lifetime using light emitting elements as light sources have been developed. In order to configure a lighting fixture in the same manner as a conventional lighting fixture using an annular fluorescent lamp using a light emitting device as a light source, a plurality of light emitting devices are arranged in a circle and emitted from these light emitting devices. It is necessary to transmit the light to be directed toward the cover member and irradiate a predetermined range.

  When a plurality of light emitting elements are arranged in a circle shape as a light source in this way, it can be configured in a manner similar to the case where a conventional annular fluorescent lamp is used, and a lighting fixture that can be expected to have a long life and thinning. Can be realized.

JP 2002-75030 A Japanese Patent No. 4479805

  However, when a light-emitting element such as an LED is used as the light source, the light-emitting element has a strong directivity of the emitted light, which causes a problem that the brightness of the cover member is not easily uniformed.

  The present invention has been made in view of the above problems, and in the case where a plurality of light emitting elements are arranged in a circle, the brightness of the cover member can be made uniform, and in particular, the lighting that can suppress the darkness of the central portion of the cover member. An object is to provide an apparatus.

  An illumination device according to an embodiment of the present invention includes a main body having a mounting portion facing a wiring fixture installed on a fixture mounting surface; a light source portion having a plurality of light sources in an annular shape disposed around the mounting portion; A lighting device disposed in a region surrounded by the light source unit of the instrument main body; a lighting device cover that covers the lighting device so as to protrude to the front side of the light source unit; an entire surface of the light source unit facing the light source unit And an inner cover disposed on the front side of the lighting device cover.

  According to the embodiment of the present invention, it is possible to provide an illuminating device that can achieve uniform illumination by suppressing light and dark portions of a cover member in an annular arrangement of light emitting elements.

It is sectional drawing which shows the illuminating device which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows typically the course of the light of the illumination device. It is a top view which shows the board | substrate of the light source part in the illumination device. It is explanatory drawing which shows the case where a cover member joins and removes in the illumination device.

  A first embodiment of the present invention will be described below with reference to FIGS. In the drawings, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  The illuminating device of this embodiment is a type that is used by being attached to a hanging ceiling installed on a fixture mounting surface, and is indoors by light emitted from a light source unit having a plurality of light emitting elements arranged in a substantially annular shape. Lighting.

  In FIG. 1, the lighting device includes a main body 1, a light source unit 2, a light source cover member 3, a cover member 4, and a lighting device 5. Moreover, the adapter A electrically and mechanically connected to the hooking sealing body Cb installed in the ceiling surface C as an instrument mounting surface is provided. Such an illuminating device is formed in a round and circular appearance, and has a front side as a light irradiation surface and a back side as a mounting surface to the ceiling surface C.

  The main body 1 is formed in a circular shape from a flat plate of a metal material such as a cold-rolled steel plate, and an opening through which the adapter A is inserted is formed in a substantially central portion.

  The light source unit 2 includes a substrate 21 and a plurality of light emitting elements 22 mounted on the substrate 21. The substrate 21 has a predetermined width dimension, in the present embodiment, is formed in a substantially annular shape by two substantially C-shaped substrates, and is made of a glass epoxy resin flat plate as an insulating material, with copper foil on the surface side. A wiring pattern is formed. Further, a white resist layer acting as a reflective layer is applied on the wiring pattern, that is, on the surface of the substrate 21. The material of the substrate 21 can be a ceramic material or a synthetic resin material when an insulating material is used. Furthermore, when it is made of metal, a metal base substrate in which an insulating layer is laminated on one surface of a base plate having good thermal conductivity such as aluminum and excellent heat dissipation can be applied.

  The light emitting element 22 is an LED, which is a surface mount type LED package. A plurality of the LED packages are mounted and arranged along the circumferential direction of the annular substrate 21 so that the adjacent light emitting elements 22 are arranged in a substantially annular manner with a substantially equal spacing distance S therebetween. The LED package is generally composed of an LED chip disposed in a main body formed of ceramics, and a translucent resin for molding such as an epoxy resin or a silicone resin that seals the LED chip. Yes.

  The LED chip is a blue LED chip that emits blue light. In the translucent resin, a phosphor is mixed, and in order to be able to emit white light, a yellow phosphor that emits yellow light that is complementary to blue light is used. Yes.

  In addition, LED may be made to mount an LED chip directly on the board | substrate 21, and you may make it mount a bullet-type LED, and a mounting system and a format are not exceptionally limited.

  The light source unit 2 configured as described above is attached by a fixing means such as a screw so that the back surface side of the substrate 21 is in close contact with the inner surface side of the main body 1. Accordingly, the substrate 21 is thermally coupled to the main body 1, and heat from the substrate 21 is conducted to the main body 1 from the back surface side.

  A light source cover member 3 is disposed on the front side of the light source unit 2. The light source cover member 3 is made of, for example, a transparent synthetic resin having insulation properties such as polycarbonate or acrylic resin, and is integrally formed in a substantially circle shape along the arrangement of the light emitting elements 22, and includes the light emitting elements 22. Therefore, the charging unit is covered with the light source cover member 3 to ensure insulation.

  Further, the light source cover member 3 is formed so that the thickness dimension becomes smaller from the substantially annular thick inner peripheral region 31 toward the outer peripheral region 32. The cross-sectional shape is a constant shape over the entire circumference. Further, the inner peripheral region 31 having a large thickness is disposed so as to overlap in the height direction of the front side 51b of the lighting device cover described later, and the outer peripheral region 32 having a small thickness is attached to the main body side. . Therefore, it is formed with an inclination angle in a direction away from the instrument main body from the outer peripheral region 32 side to the inner peripheral region 31 and is attached to the main body 1. Further, two projecting portions 33 having different annular heights extending in the direction of the substrate 21 on which the light emitting element 22 of the light source cover member 3 is mounted are formed. The inner circumference is pressed.

  In the light source unit 2 configured as described above, the substrate 21 is disposed around the opening of the main body, and the mounting surface of the light emitting element 22 is disposed on the front side, that is, in the downward irradiation direction. Further, the substrate 21 is mounted in surface contact so that the back surface side of the substrate 21 is in close contact with the flat end portion on the inner surface side of the main body. Specifically, the light source cover member 3 is overlapped from the front side of the substrate 21, and the light source cover member 3 is attached to the main body 1 by, for example, a fixing means such as a screw. Between the two and pressed and fixed.

  Therefore, the board | substrate 2 is thermally couple | bonded with the main body 1, and the heat | fever from the board | substrate 21 is conducted to the main body 1 from the back surface side, and is thermally radiated. The surface contact between the substrate 21 and the main body 1 is not limited to the case where the entire substrate 21 is in contact with the main body. It may be a partial surface contact.

  Here, the light source cover member 3 configured as described above will be described with reference to FIG. FIG. 2 shows the light path according to the present embodiment and the conventional light path in an overlapping manner. 2 shows a state in which a conventional light source cover member having a uniform thickness is attached to the lighting device cover without overlapping in the height direction, and a light source cover member 3 having a different thickness is mounted on the lighting device cover. The state where it is arranged in a superimposed manner is shown.

  First, in the conventional device shown in FIG. 2, the thickness dimension of the light source cover member 3 is not changed, and the incident surface 34 facing the light emitting element 22 and the emission surface 35 that is the irradiation direction are considered to be in a parallel state. be able to.

  As described above, when the conventional incident surface 34 and output surface 35 are in parallel, the light incident on the incident surface 34 from the light emitting element 22 at the incident angle θ1 has a refractive angle θ2 due to the refractive index of the light source cover member 3. The light is emitted outward at the refraction angle, that is, the emission angle θ4 as the advance incident angle θ3. In this case, since the incident surface 34 and the exit surface 35 are in a parallel state, θ2 = θ3, and eventually θ1 = θ4, and the incident angle and the exit angle do not change.

  The light source cover member 3 of this embodiment shown in FIG. 2 changes the thickness of the light source cover member 3. Specifically, the thickness dimension of the light source cover member 3 is 3 mm for the outer peripheral side region 32 and 1.5 mm for the inner peripheral side region 31, and the thickness increases from the outer peripheral side region 32 toward the inner peripheral side region 31. Is further inclined with respect to the main body so as to increase the separation distance toward the main body opening. Further, the substrate 21 on which the light emitting element 22 is mounted and the incident surface 34 of the light source cover member 3 are attached with an angle of 4.5 degrees, and the substrate 21 and the emission surface 35 of the light source cover member 3 are attached with an angle of 5.5 degrees. ing. Therefore, it can be considered that the incident surface 34 is inclined at a predetermined angle with respect to the emission surface 35 of the light source cover member 3. Therefore, the light from the light emitting element 22 is incident on the incident surface 34 at an incident angle θ1 ′ larger than the incident angle θ1, proceeds at the refraction angle θ2 ′ due to the refractive index of the light source cover member 3, and is refracted as the incident angle θ3 ′. That is, the light is emitted outward at an emission angle θ4 ′. In this case, the relationship θ3 ′ <θ3 is satisfied, and the output angle θ4 ′ can be made smaller than the incident angle θ1 ′ when θ1 ′> θ4 ′. As a result, the incident angle θ1 is satisfied when θ1> θ4 ′. The outgoing angle θ4 ′ becomes smaller than θ1, and a lot of outgoing light can be emitted in the central axis direction of the instrument body 1.

  Furthermore, since the light source cover member 3 is formed thicker toward the center of the instrument body 1, in addition to the light transmitted from the light source cover member 3 by entering at a large incident angle θ 1 ′, a light source A relatively large amount of light that is guided in the cover member 3 is generated. Therefore, the light which Fresnel reflected light of the light incident on the light source cover member 3 is guided in the light source cover member 3 is emitted from the end surface 36 of the light source cover member 3 disposed on the front side 51b of the lighting device cover 51. Can be made.

  In addition, when the inclination angle of the light source cover member 3 is larger than 10 degrees, the incident and exit angles from the light emitting element 22 are increased, and the amount of Fresnel light generated in the light source cover member 3 is excessively increased. Since light transmitted through and emitted in the direction of the cover member 3 is reduced, the irradiation efficiency is lowered. Preferably, if the angle is 3 degrees to 8 degrees, the light guided through the light source cover member 3 can be efficiently guided toward the center of the instrument, and the entire surface of the cover member 4 can be irradiated uniformly.

  The lighting device 5 includes a circuit board and circuit components such as a control IC, a transformer, and a capacitor mounted on the circuit board. The circuit board is formed in a plate shape so as to surround the center portion, and circuit components are mounted on the surface side thereof.

  The circuit board is electrically connected to the adapter A side, and is connected to a commercial AC power source via the adapter A. Accordingly, the lighting device 5 receives the AC power supply, generates a DC output, supplies the DC output to the light source unit 2 via the lead wire, and controls the light source unit 2 to be lit.

  The lighting device cover 51 is formed in a substantially short cylinder shape by a metal material such as a cold rolled steel plate, and an annular space is formed by an annular flat plate on the pair of side wall surfaces 51a and the front surface side 51b (irradiation side). The lighting device is surrounded by

  The lighting device cover 51 configured as described above is attached with a flange on the back side screwed to the instrument body 1. In addition, the lighting device cover 51 can be directly or indirectly attached to the appliance main body 1, and the specific attachment configuration is not limited.

  In addition, the opening part of the instrument main body 1 is an adapter guide formed in a substantially cylindrical shape, and the adapter A is inserted through the center part of the adapter guide.

  The cover member 4 has a light-transmitting property such as an acrylic resin, and is formed in a substantially circular shape from a material having a milky white diffusibility.

  The cover member 4 is detachably attached to the outer peripheral edge of the main body 1 so as to cover the front side of the main body 1 including the light source unit 2. Specifically, by rotating the cover member 4, the shade mounting bracket provided on the cover member 4 is engaged with the shade receiving bracket provided in the recess formed by the protruding portion of the main body 1. Mounted.

  When the cover member 4 is removed, the cover member 4 can be removed by rotating the cover member 4 in the direction opposite to that at the time of attachment and releasing the engagement between the cover member metal fitting and the cover member receiving metal fitting.

  When power is supplied to the lighting device 5 in a state where the lighting fixture is attached to the ceiling surface C, the light emitting element 22 is energized through the substrate 21 and the corner light emitting element 22 is lit. The light emitted from the light emitting element 22 has a different thickness, and is irradiated with a relatively large amount of light toward the center of the instrument body 1 by the light source cover member 3 attached at an inclination, and is irradiated toward the front side. The light emitted from the light emitting element 22 passes through the cover member 4 and is emitted outward.

  As described above, according to the present embodiment, since the light source cover member 3 covering the light emitting element 22 is thick and inclined, the light emission arranged in an annular shape with a simple configuration without using another member such as a lens. Since the light from the element 22 can be effectively irradiated in the center direction of the cover member 4, uniform brightness and illuminance on the cover member surface can be obtained.

  In addition, this invention is not limited to the structure of the said embodiment, A various change is possible in the range which does not deviate from the summary of invention. For example, the light source cover member 3 may be disposed so as to overlap the front surface side of the lighting device cover 51 in the height direction, and only the thickness thereof may be changed or may not be changed. Even if the light source cover member 3 that is not changed even if the inclination is changed, the light source cover member 3 in which both the thickness and the inclination are changed can be adopted. The light emitting element 22 may be a solid light emitting element such as an LED or an organic EL. In this case, the number of the light emitting elements 22 is not particularly limited.

DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Light source part, 3 ... Light source cover member, 4 ... Cover member, 5 ... Lighting apparatus, 21 ... Board | substrate, 22 ... Light emitting element (LED)

Claims (3)

A main body having a mounting portion facing a wiring device installed on the device mounting surface;
A light source portion having a plurality of light sources in an annular shape disposed around the mounting portion;
A lighting device disposed in a region surrounded by the light source unit of the instrument body;
A lighting device cover that covers the lighting device so as to protrude to the front side of the light source part;
An inner cover that faces the light source section, covers the entire surface of the light source section, and is disposed on the front side of the lighting device cover;
An illumination device comprising:   The lighting device according to claim 1, wherein the inner cover has a thickness that changes in a circumferential direction with an annular center as an origin.   The lighting device according to claim 1, wherein the inner cover is attached to the main body while being inclined from a ring-shaped outer periphery toward a circumferential direction with the center as an origin.

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