JP2013077402A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device in which glare feeling is suppressed, and that, a light-emitting element capable of diffusing light in a wide range is used.SOLUTION: The lighting device is provided with a light-emitting module, a case in which the light-emitting module is mounted on one end in an axial direction, a cylindrical coupling part jointed with the case to surround the light-emitting module on that one end, a globe which is coupled with the case through the coupling part and is arranged in a progressing direction of emitted light from the light-emitting module, a first reflection film for reflecting the emitted light having transmitted through the globe, and a second reflection film located in a progressing direction of reflected light from the first reflection film having transmitted through the globe.

Description

The present invention relates to an illumination device including a light emitting module such as a light emitting diode.

In recent years, lighting devices using light emitting elements such as light emitting diodes have become widespread for the purpose of energy saving. However, since the light emitting element has a strong directivity of light, there is a problem that a feeling of glare (brightness) is felt and an irradiation range is narrow. In order to expand the irradiation range to a light distribution angle suitable for the application, it has been studied to arrange an optical element or the like in the light emitting direction from the light emitting diode.

JP 2010-733337 A JP 2009-9870 A JP 2010-62005 A

  The problem to be solved by the present invention is to provide an illuminating device that suppresses glare and diffuses light over a wide range in an illuminating device using a light emitting element.

  An illuminating device according to an embodiment of the present invention includes a light emitting module, a housing in which the light emitting module is placed at one end in the axial direction, and a cylindrical connecting portion joined to the housing so as to surround the light emitting module at one end. And a light-transmitting glove that is connected to the casing by the connecting portion and is placed in the traveling direction of the emitted light of the light emitting module, a first reflective film that reflects the emitted light that has passed through the glove, and the globe And a second reflection film positioned in the traveling direction of the reflected light from the first reflection film.

An illuminating device according to an embodiment of the present invention includes a light emitting module, a housing in which the light emitting module is placed at one end in the axial direction, and a cylindrical connecting portion joined to the housing so as to surround the light emitting module at one end. And a light-transmitting glove that is connected to the housing by the connecting portion and is placed in the traveling direction of the emitted light of the light emitting module, and includes two surfaces on the light emitting module side and on the opposite side to the light emitting module side. A lighting device comprising a globe and first and second reflective films formed on a surface opposite to the surface on the light emitting module side.

  According to the illumination device of each embodiment, a part of the light emitted from the light emitting module can be emitted from the top of the globe in a direction parallel to the optical axis, and a part of the light can be emitted from the side of the globe. Thereby, the glare feeling of an illuminating device can be suppressed and light can be diffused in a wide range.

It is a schematic diagram of the cross section parallel to the optical axis which shows the illuminating device which concerns on the 1st Embodiment of this invention. It is a schematic diagram of the cross section parallel to the optical axis which shows the modification of a globe. It is a schematic diagram of the cross section parallel to the optical axis which shows the modification of a prism.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Note that the same or corresponding portions are denoted by the same reference numerals in a plurality of drawings referred to below.

  FIG. 1 is a schematic cross-sectional view showing an illuminating device 1 according to a first embodiment of the present invention.

  The illuminating device 1 is provided on a housing 5 having a light emitting module 3 mounted on one end thereof, a cylindrical connecting portion 7 connected to the housing 5, a globe 9 connected to the connecting portion 7, and an inner surface of the globe 9. The prism 11 is provided. The globe 9 includes a light-transmitting annular portion 9a and a lid 9b that covers the opening of the annular portion 9a, and the prism 11 is provided on the inner surface of the annular portion 9a.

  The light emitting module 3 includes a plurality of semiconductor light emitting elements such as light emitting diodes (LEDs). As the light emitting diode, for example, a white LED formed by applying a yellow phosphor to a blue LED, an orange LED obtained by adding red to the LED, and blue, green, and the like can be used. . The emitted light of these semiconductor light emitting elements has a feature such that the glare feeling is stronger than a light source using a conventional filament and an afterimage remains visually. According to the present embodiment, the glare can be reduced as will be described later.

  For example, the light emitting module 3 has a flat substrate formed of a metal material such as aluminum or an insulating material such as ceramics or epoxy resin, and a wiring pattern is formed on a mounting surface which is one surface of the substrate. In addition, a plurality of light emitting diodes (LEDs) are densely arranged in a matrix, for example, in the central area of the mounting surface. The optical axis of the light emitting module 3 is perpendicular to the surface of the light emitting module 3.

The housing 5 is a cylindrical or columnar member formed of a member such as aluminum having excellent thermal conductivity. A lighting circuit for the light emitting module 3 can be provided in the internal space of the cylindrical housing 5. The cylindrical housing 5 can have an internal space in at least a part of the inside, and a lighting circuit can be provided in the internal space.

The light emitting module 3 is mounted on one end of the housing 5 in the axial direction. For example, at one end of the housing 5, a circular heat conductive support portion in which the light emitting module 3 is mounted in a plan view is installed. Thereby, the heat generated in the light emitting module 3 can be transmitted to the housing 5 via the support portion and radiated to the outside. The heat conductive support may be formed integrally with the housing 5.

The connecting portion 7 is a cylindrical member composed of a single member or a plurality of members, and one end in the axial direction is connected to one end on which the light emitting module 3 of the housing 5 is mounted. In FIG. 1, the connecting portion 7 and the housing 5 are connected at the outer peripheral edge of the housing 5, but the light emitting module 3 may be in a relationship surrounding the inside of the cylinder, and may be joined inside the outer peripheral edge of the housing 5. Also good.

For example, as shown in FIG. 1, the housing 5 and the connecting portion 7 are connected to each other by fitting a concave portion (convex portion) of the housing 5 with a convex portion (concave portion) of the connecting portion 7 aligned with the concave portion. This can be achieved.

At the other end of the connecting portion 7 in the axial direction, a globe 9 is installed as shown in FIG. More specifically, an annular portion 9a of the globe is formed on the connecting body 7 side, and a lid 9b that covers the opening of the annular portion 9a is formed at the other end of the annular portion 9a. The space formed by the inner surface of the annular portion 9a may be a cylindrical shape or a polygonal column.

A light transmissive material is used for the globe 9 and reflection films 13a and 13b are formed above and below the annular portion 9a. By doing so, a part of the light emitted from the light emitting module 3 to the reflective film 13a is reflected, passes through the annular portion 9a, and directly reflected to the outside or further reflected by the reflective film 13b. And go outside. In FIG. 1, a state where light from the light emitting module 3 is reflected a plurality of times on the surfaces of the upper and lower reflection films 13a and 13b is denoted by reference numeral 30a, and light emitted from the lid body 9b is denoted by reference numeral 30b. The softness of the light 30b emitted from the lid body 9b can be changed by selecting the material of the lid body 9b. For example, a reflective film similar to the reflective film 13b is formed on the surface of the lid 9b on the light emitting module side, or the lid 9b is made of a milky white light transmissive material.

The reflection films 13a and 13b can be realized by, for example, an aluminum vapor deposition film. That is, the upper and lower end surfaces of the annular portion 9a are mirror-finished by the aluminum vapor deposition film and reflect incident light. Further, the reflection film 13b is not limited to the processing of the end surface of the annular portion 9a, and may be formed on the upper end surface of the connecting portion 7. Further, the reflective film 13a between the annular portion 9a and the lid body 9b may be provided on the lid body 9b side. In this case, as shown in FIG. 1, it is possible to perform mirror processing on one surface of the lid 9b in a lump (entire surface), which is convenient for manufacturing.

The material of the globe 9 is desirably an acrylic resin having excellent processability, but may be other materials as long as the material has optical transparency.

In FIG. 1, the outer peripheral portion of the annular portion 9 a is divided into three in the vertical direction, the outer periphery of the central region is the largest, and inclined surfaces are provided in the upper and lower regions in the center. The outer peripheral shape of the annular portion 9a is not limited to this, and can be appropriately formed into a shape excellent in light dispersibility, decorativeness, and the like.

The prism 11 is additionally used to further suppress the glare of the lighting device 1 and to increase the light diffusibility. The prism 11 is made of a light transmissive member and is formed on the inner surface of the annular portion 9a. The prism 11 has surface irregularities that can change the traveling direction of incident light. For example, in FIG. 1, the central portion of the prism 11 in the vertical and vertical directions is thickened to the maximum, and the unevenness is formed by gradually decreasing the thickness in the upper and lower end directions. The light transmissive material used for the prism 11 can be a synthetic resin such as an acrylic resin. The prism 11 may be formed by directly processing the inner surface of the annular portion 9a, or an annular prism formed separately may be bonded to the inner surface of the annular portion 9a. When a separate prism 11 is used, it is desirable that the outer surface of the prism 11 can be bonded to the inner surface of the annular portion 9a in order to ensure sufficient bonding with the annular portion 9a.

In addition, it is desirable that the annular portion 9a of the globe 9 and the side surfaces of the prism 11 are sufficiently polished and have high transparency in order to increase the luminance of the lighting device.

A base 17 is formed at the other axial end of the housing 5 as shown in FIG. The base 17 is typically formed with a shell and an eyelet, and these are electrically connected to a lighting circuit installed inside the housing 5 through a connection line. The output end of the lighting circuit is connected to the LED module 3 via a connector via a wiring (not shown).

Although FIG. 1 shows an LED bulb using the cap 17, the invention of this embodiment can also be applied to a pendant type suspended from a ceiling or the like.

FIG. 2 is a schematic cross-sectional view showing a modified example of the globe 9. In order to show the positional relationship, the optical module 3 is also shown in FIG. Hereinafter, the difference from the globe 9 will be mainly described with reference to FIG. In the modification of the globe 9, a flat plate member is used instead of the annular portion 9a and the lid body 9b. In the flat globe 9, a first reflective film 13 a is formed on a surface far from the optical module 3. In addition, a second reflective film 13b is formed in a region that surrounds a region immediately above the light emitting module 3 and that is reflected by light reflected from the first reflective film 13a on the surface close to the light emitting module 3. The emitted light from the light emitting module 3 is incident on the flat globe, part of which is transmitted through the first reflective film 13a, and the remaining part is reflected by the first reflective film 13a. The light reflected by the first reflecting film 13a is emitted as it is from the side surface of the globe 9 as it is (30b), or incident on the second reflecting film and further reflected and emitted outside (30a). The number of reciprocations between the first and second reflective films 13a and 13b may be a plurality of times.

FIG. 3 is a schematic cross-sectional view showing a modified example of the prism 11. In order to increase the brightness of the illuminating device 1, as shown in FIGS. 3A, 3B and 3C, the cross-sectional structure of the prism 11 can be made more complicated. As shown in FIG.3 (c), the cross-sectional shape of a recessed part can also be made into a concave curved surface shape.

  DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 3 ... Light emitting module, 5 ... Case, 7 ... Connection part, 9 ... Globe, 9a ... Ring part, 9b ... Cover, 11 ... Prism, 13a, 13b ... Reflection film, 17 ... cap, 19 ... caulking, 30a, 30b ... light from light emitting module

Claims (5)

A light emitting module;
A housing in which the light emitting module is placed at one end in the axial direction;
A cylindrical connecting portion joined to the housing so as to surround the light emitting module at the one end;
A light-transmitting glove that is connected to the casing by the connecting portion and is placed in the traveling direction of the emitted light of the light emitting module;
A first reflective film that reflects the emitted light transmitted through the globe;
And a second reflective film positioned in the traveling direction of the reflected light from the first reflective film that has passed through the globe. A light emitting module;
A housing in which the light emitting module is placed at one end in the axial direction;
A cylindrical connecting portion joined to the housing so as to surround the light emitting module at the one end;
A light-transmitting glove that is connected to the casing by the connecting portion and is placed in the traveling direction of the emitted light of the light emitting module, the two surfaces on the light emitting module side and on the opposite side of the light emitting module side A glove comprising:
A lighting device comprising: first and second reflective films formed on the two surfaces.   The lighting device according to claim 1, wherein the globe includes upper and lower surfaces perpendicular to an optical axis direction of the light emitting module, and the first and second reflection films are metal vapor deposition films formed on the upper and lower surfaces. .   The lighting device according to any one of claims 1 to 3, wherein the globe includes an annular portion formed on the light emitting module side and a lid portion that covers an opening of the annular portion far from the light emitting module.   The illumination device according to any one of claims 1 to 4, further comprising a light-transmitting prism formed on an inner surface of the annular portion.