JP2016167432A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a wide light distribution angle in a lighting device.SOLUTION: A lighting device 100 includes: a light emission part 121 formed by semiconductor light emitting elements; and a cover member 103 covering the light emission part 121. The lighting device 100 includes a half reflection member which is attached to the cover member 103 so as to protrude from the cover member 103 to the light emission part 121 side, transmits part of light emitted from the light emission part 121 to the cover member 103, and reflects the other of the light to the light emission part 121 side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an illuminating device, and more particularly, to an illuminating device including a light emitting unit made of a semiconductor light emitting element such as a light emitting diode (LED).

  An LED, which is a kind of semiconductor light-emitting element, is smaller, more efficient, and has a longer life than a conventional illumination light source. Demand for lighting devices using LEDs (hereinafter sometimes simply referred to as “LED bulbs”) that can replace conventional incandescent bulbs using filament coils, as a result of recent market needs for energy and resource savings. Has increased.

  In general, an LED bulb often includes a light emitting module in which a plurality of LEDs having a narrow light distribution angle (strong directivity) are mounted on one surface of a substrate. And narrow.

  Therefore, for example, as in the lighting device described in Patent Document 1, the light distribution module has a wide light distribution angle by reflecting the light from the light emitting module by changing the thickness of the cover covering the light emitting module. Has been proposed.

JP 2012-134115 A

  However, it is difficult to obtain a wide light distribution angle (for example, 300 ° light distribution) that can be replaced with an incandescent light bulb only by changing the thickness of the cover that covers the light emitting module, as in a conventional LED light bulb. .

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide an illumination device using a semiconductor light emitting element capable of obtaining a wide light distribution angle.

  In order to achieve the above object, an illumination device according to the present invention is an illumination device including a light emitting unit made of a semiconductor light emitting element and a cover member that covers the light emitting unit, from the cover member to the light emitting unit side. A semi-reflective member that is attached to the cover member so as to protrude toward the cover member, transmits a part of the light emitted from the light emitting unit toward the cover member, and reflects the remaining light toward the light emitting unit side. It is characterized by that.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to reflect part of the light radiated | emitted from the light emission part effectively by the semi-reflective member attached to the cover member, and to spread the light distribution as the whole illuminating device arbitrarily.

FIG. 1 is a perspective view showing a lighting device. FIG. 2 is a cross-sectional view showing the vicinity of the cover member of the lighting device. FIG. 3 is an exploded perspective view showing the lighting apparatus according to the present embodiment. FIG. 4 is a cross-sectional view showing the vicinity of the periphery of the illumination device according to the present embodiment. FIG. 5 is a perspective view showing a lighting device according to another embodiment. FIG. 6 is a perspective view showing a disassembled state of a lighting apparatus according to another embodiment. FIG. 7 is a cross-sectional view showing another example of the semi-reflective member. FIG. 8 is a cross-sectional view showing another example of the semi-reflective member.

  Next, an embodiment of a lighting device according to the present invention will be described with reference to the drawings. In addition, the following embodiment is only what showed an example of the illuminating device based on this invention. Accordingly, the scope of the present invention is defined by the wording of the claims with reference to the following embodiments, and is not limited to the following embodiments. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept of the present invention are not necessarily required to achieve the object of the present invention. It will be described as constituting a preferred form.

  Also, the drawings are schematic diagrams in which emphasis, omission, and ratio adjustment are performed as appropriate to show the present invention, and may differ from actual shapes, positional relationships, and ratios.

(Embodiment 1)
FIG. 1 is a perspective view showing a lighting device.

  As shown in these drawings, the lighting device 100 is an LED bulb that is an alternative to a bulb-type fluorescent lamp or an incandescent bulb, for example, and includes a light emitting unit 121, a cover member 103, and a semi-reflective member 104. Yes. In the case of the present embodiment, the lighting device 100 includes a base 101 and a housing 105.

[Base]
The base 101 is a member that receives power supplied to the light emitting unit 121 from the outside of the lighting device 100, and is a member that attaches the lighting device 100 to the socket by engaging with a socket (not shown) for attaching a light bulb. . In the case of the present embodiment, since the illumination device 100 is an LED bulb, the outer shape of the base 101 is generally a shape that can be screwed from the inside to a socket to which an incandescent bulb or the like is attached. Further, the inner shape of the base 101 is a shape that can be screwed into the housing 105 from the outside.

  Specifically, the base 101 is attached so as to close a cylindrical first electrode part 111 having a male screw on the outside and a female screw on the inside, and a bottom opening of the first electrode part 111 through an insulating member. 2nd electrode part 112 is provided.

[Case]
The housing 105 is a structural member that houses therein a drive circuit 123 for causing the light emitting unit 121 to emit light, and is a structural member that holds the light emitting unit 121 in a predetermined position and is joined to the cover member 103. In the case of this embodiment, the housing 105 is provided in the lighting device 100 as a single resinous structure. Note that the housing 105 may be configured by a plurality of members such as a circuit case that houses the drive circuit 123 and a circuit cover that covers the circuit case.

[Light emitting part]
The light emitting unit 121 is a light source composed of a semiconductor light emitting element that emits light based on supplied power. In the present embodiment, the light emitting unit 121 is attached to the housing 105 as the light emitting module 102 in which the light emitting units 121 are arranged concentrically on the surface of the substrate 122.

  In the case of the present embodiment, the light emitting units 121 are arranged on the same plane, and the individual optical axes 124 that are the optical axes of the light emitting units 121 are arranged in a line.

  The semiconductor light emitting element emits monochromatic light having a wavelength shorter than that of yellow, and specifically emits blue light. The light emitting unit 121 is a package type device having a semiconductor light emitting device attached to the bottom of the cavity, and the semiconductor light emitting device emits light based on light emitted by the semiconductor light emitting device in order to emit white light. A resin member containing a light conversion substance that emits light different from light is filled in the cavity. Therefore, in the case of the present embodiment, the light emitting module 102 is a surface mount type (SMD: Surface Mount Device) module.

  The light conversion substance provided in the resin member includes a fluorescent substance that emits light having a wavelength different from that of the light emitted from the semiconductor light emitting element when excited by the light emitted from the semiconductor light emitting element, and the light or fluorescence emitted from the semiconductor light emitting element. It includes at least one of filter materials such as pigments and dyes that absorbs (does not transmit) some wavelengths of light emitted by the material.

  In the case of the present embodiment, the light conversion substance provided in the resin member contains a fluorescent substance. The fluorescent substance is excited by light emitted from the semiconductor light emitting element (for example, blue) and emits fluorescent light, and emits light of a color (for example, yellow) different from the light emitted from the semiconductor light emitting element. As described above, the blue light emitted from the semiconductor light emitting element and the yellow light emitted from the light conversion material are mixed, and a person who observes the light at a time can emit white light (pseudo ) Is recognized. The light conversion substance provided in the resin member may include a plurality of types of fluorescent substances, and the chromaticity of white light can be effectively adjusted by changing the ratio of the amounts of light of different types of fluorescence. Become.

  The resin constituting the resin member has a light-transmitting property capable of holding the light conversion substance in a dispersed state and transmitting light emitted from the semiconductor light emitting element and light converted by the light conversion substance. Specifically, for example, a transparent resin such as a silicone resin or an epoxy resin can be listed.

  Examples of the light conversion substance include YAG (yttrium, aluminum, garnet) -based fluorescent substances. The YAG is a substance that can emit yellow light based on the blue light emitted by the semiconductor light emitting device. Moreover, CASN (CaAlSiN3: Eu) can be listed as another fluorescent substance contained as a light conversion substance. This is a substance that emits red light based on the light emitted from the semiconductor light emitting device, and adjusts the spectrum of the light emitted as a whole and adjusts the chromaticity of the pseudo white light. Furthermore, the light conversion substance may contain a fluorescent substance that emits green or the like, or alternatively.

  The resin member may further contain a light diffusing material made of fine particles such as silica in a dispersive manner. Thereby, light is scattered (diffuse reflection), the light distribution of the light emitted from the light emitting unit 121 can be broadened, and the individual presence of the semiconductor light emitting elements can be suppressed.

  Although the attachment mode of the light emitting module 102 is not particularly limited, for example, in the case of the present embodiment, the light emitting module 102 is attached to the surface of the housing 105 with a fastening member or the like.

  The substrate 122 constituting the light emitting module 102 is a member that holds the light emitting unit 121 and also holds wiring for supplying power to the light emitting unit 121. In the present embodiment, the substrate 122 has a disk shape. . Moreover, although the material which comprises the board | substrate 122 is not specifically limited, For example, resin, ceramic, glass etc. can be illustrated.

[Driver]
The driving device 123 (see FIG. 2) is a device including a driving circuit (not shown) that converts electric power (AC) supplied via the base 101 into electric power (DC) for causing the light emitting unit 121 to emit light. is there. In the case of this embodiment, the driving device 123 is included in the housing 105.

  The drive circuit is a lighting circuit for lighting (emitting) the light emitting module 102 and supplies predetermined power to the light emitting module 102.

  In the case of the present embodiment, the drive circuit includes a circuit board and a plurality of circuit elements (electronic components) connected to the circuit board.

  A circuit board (not shown) is a printed board on which metal wiring is patterned, and electrically connects a plurality of circuit elements mounted on the circuit board.

  The circuit element includes, for example, a bridge circuit, a ceramic capacitor (output-side smoothing capacitor), an electrolytic capacitor, a choke coil, a noise filter, and the like.

[Cover member]
The cover member 103 is a member having a function of covering the light emitting unit 121 in the accommodated state and transmitting light emitted from the light emitting unit 121.

  In the present embodiment, the cover member 103 has a dome shape, and the opening of the cover member 103 is closed by the housing 105.

  The material constituting the cover member 103 is not particularly limited, but in the case of the present embodiment, the cover member 103 is made of a polyolefin-based resin that can transmit visible light satisfactorily. Further, the cover member 103 is formed integrally with the semi-reflective member 104.

  The cover member 103 is not limited to a so-called transparent member that completely transmits light, but may be a member that transmits a part of light. For example, it is possible to transmit light while scattering light such as polished glass.

[Semi-reflective member]
FIG. 2 is a cross-sectional view showing the vicinity of the cover member of the lighting device.

  As shown in the figure, the semi-reflective member 104 is a member attached to the cover member 103 so as to protrude from the cover member 103 toward the light emitting unit 121 side. The semi-reflective member 104 has a function of transmitting part of the light emitted from the light emitting unit 121 toward the cover member 103 and reflecting the rest toward the light emitting unit 121 side.

  Specifically, the semi-reflective member 104 may have a shape that transmits a part of the light and reflects the remaining light depending on the difference in the incident angle of the light, and also has a light like a mirror like a half mirror. It is also possible to provide a minute portion that reflects the light in a dispersed state, reflect the light incident on the minute portion, and transmit the light incident on the other portion.

  In the case of the present embodiment, lighting device 100 includes a plurality of light emitting units 121, and semi-reflective member 104 is at a position that does not intersect any of individual optical axes 124 that are the respective optical axes of light emitting units 121. Has been placed. As a result, the illumination device 100 can be strongly distributed in the direction of the individual optical axis 124.

  In the case of the present embodiment, the light emitting unit 121 is arranged on the circumference, and the semi-reflective member 104 is arranged in the same positional relationship as each of the light emitting units 121 existing on the same circumference. It has a conical shape whose apex is directed to the 121 side. Further, the semi-reflective member 104 is disposed so as to intersect with the entire optical axis 125 that is the optical axis of the light emitting module 102 as a whole, and the central axis coincides with the entire optical axis 125.

  Thereby, a part of the light emitted from each light emitting part 121 and incident on the semi-reflective member 104 is evenly transmitted on the circumference around the entire optical axis 125, and the rest is the light emitting part. Reflected on the 121 side. Accordingly, the lighting device 100 has a wide light distribution (for example, 300 °) that is wider than the light emitting module 102 (for example, 300 °) and has a uniform horizontal light distribution with the entire optical axis 125 of the light emitting module 102 as the central axis. Can do.

(Embodiment 2)
Next, the second embodiment will be described. In addition, the same code | symbol may be attached | subjected to what has the effect | action and function similar to Embodiment 1, and the same shape, mechanism, and structure (part) may be abbreviate | omitted. In the following description, differences from the first embodiment will be mainly described, and description of the same contents may be omitted.

  FIG. 3 is an exploded perspective view showing the lighting apparatus according to the present embodiment.

  The lighting device 100 is a ceiling light that is attached to the ceiling surface (installation surface) with the cover member 103 facing downward, and mainly illuminates the lower portion (opposite side of the ceiling surface). And a semi-reflective member 104. The lighting device 100 includes a base body 106.

  In the following second embodiment, the ceiling surface side is expressed as the upper side, and the floor surface side is expressed as the lower side.

[Substrate]
The base 106 is a member that is attached to the ceiling surface with the upper surface (attachment surface) facing the ceiling surface, and has a circular shape in plan view, and is obtained by, for example, pressing a steel plate material or the like. . A light emitting unit 121 is provided on the lower surface side of the base 106, and the cover member 103 is attached to the base 106 so that the entire light emitting unit 121 is covered.

  In addition, an opening 161 is provided in the central portion of the base 106, and the lighting device 100 is attached to the ceiling by engaging a hooking sealing body (not shown) provided on the ceiling surface with the edge of the opening 161. It is done.

[Light emitting part]
The light emitting units 121 are arranged on the circumference of the lower surface of the base 106. The light emitting unit 121 is arranged so that the individual optical axes 124 are directed downward, and the individual optical axes 124 of the light emitting unit 121 are aligned with each other.

  In the case of the present embodiment, the light emitting unit 121 is attached to the base 106 as the light emitting module 102 attached to the arc-shaped substrate 122 obtained by dividing the annular ring into a plurality of parts, and the lighting device 100 includes the plurality of light emitting modules 102. I have.

[Cover member]
The cover member 103 is a member having a function of covering the entire light emitting unit 121 attached to the base 106 along the circumference and transmitting light emitted from the light emitting unit 121.

  In the case of the present embodiment, the cover member 103 is a thin and wide circular dome-shaped member, and is detachably attached to the base 106 so as to cover the entire light emitting unit 121 from below.

  An example of the material constituting the cover member 103 is acrylic resin, and light diffusing particles may be provided in a dispersed state in order to uniformly extract light from the entire cover member 103 to the outside.

[Semi-reflective member]
FIG. 4 is a cross-sectional view showing the vicinity of the periphery of the illumination device according to the present embodiment.

  In the case of the present embodiment, the semi-reflective member 104 is a member that is manufactured separately from the cover member 103, and is bonded to the cover member 103 so as to protrude from the cover member 103 toward the light emitting unit 121 side. It is attached.

  The semi-reflective member 104 has an annular shape corresponding to the shape of the cover member 103, and has a substantially triangular cross-sectional shape. The semi-reflective member 104 is disposed so that the ridge line is directed to the light emitting unit 121 side. Further, the semi-reflective member 104 is a position that does not intersect any of the individual optical axes 124 that are the respective optical axes of the light emitting unit 121, and a half-value angle portion that has a luminous intensity of 50% with respect to the maximum luminous intensity value. It is arranged at the crossing position. Further, the semi-reflective member 104 is disposed so as not to intersect the entire optical axis 125 that is the optical axis of the light emitting module 102 as a whole. The semi-reflective member 104 is arranged so that the entire optical axis 125 of the light emitting unit 121 passes through the center of the semi-reflective member 104.

  According to the above, even if the lighting device 100 is a ceiling light, a wide light distribution angle can be ensured, and for example, the ceiling on which the lighting device 100 is attached can be brightly illuminated as a ceiling light. . Moreover, it becomes possible to illuminate a ceiling etc. equally centering on the illuminating device 100.

(Embodiment 3)
Subsequently, Embodiment 3 will be described. In addition, the same code | symbol may be attached | subjected to what has the effect | action and function similar to Embodiment 1, 2, and the same shape, a mechanism, and a structure, and description may be abbreviate | omitted. In the following description, differences from the first embodiment will be mainly described, and description of the same contents may be omitted.

  FIG. 5 is a perspective view showing a lighting device according to another embodiment.

  FIG. 6 is a perspective view showing a disassembled state of a lighting apparatus according to another embodiment.

  As shown in these drawings, the illumination device 100 includes a base 101, a light emitting module 102 including a light emitting unit 121, a cover member 103, a semi-reflective member 104, and a driving device 123, as in the first embodiment. Although provided, the housing 105 for housing the driving device 123 is not provided. Furthermore, the lighting device 100 includes a stem 107.

[Cover member]
In the case of the present embodiment, the cover member 103 is a glove-shaped member having an attachment part 134 to which the base 101 is attached and a transmission part 133 that transmits light emitted from the light emitting part 121. The cover member 103 is formed so as to cover the light emitting module 102 in the accommodated state by joining the first member 131 and the second member 132 together. In the case of the present embodiment, the cover member 103 is composed of a first member 131 and a second member 132 that are divided on a plane that intersects (orthogonally) the entire optical axis 125 of the light emitting module 102. For example, it may be divided by a plane including the entire optical axis, and the number of divisions and the division position are arbitrary.

  The first member 131 includes a transmission part 133 that transmits light emitted from the light emitting module 102, and does not include the attachment part 134. The first member 131 has a hollow hemispherical shape. On the other hand, the second member 132 includes an attachment portion 134 to which the base 101 is attached and a transmission portion 133 that transmits light emitted from the light emitting module 102.

  The first member 131 and the second member 132 are maintained in a joined state by mechanical joining such as screwing, chemical joining using an adhesive, ultrasonic welding (welding), or the like.

  The attachment portion 134 is formed integrally with the transmission portion 133 of the second member 132, and has a cylindrical shape in which an external thread is provided on the outer periphery. Further, the inside of the attachment portion 134 functions as a holding portion for holding the light emitting module 102 in a predetermined position via the drive device 123 and the stem 107, and the drive device 123 is placed inside the attachment portion 134. It can be fixed.

[Light emitting module]
In the case of the present embodiment, the light emitting module 102 including the light emitting unit 121 is a component in which the diameter of a virtual circumscribed circle circumscribing the largest outer shape portion (silhouette) is longer than the diameter of the opening of the base 101, The light emitting unit 121 and a substrate 122 that holds wiring for supplying power to the light emitting unit 121 are provided. The light emitting module 102 is arranged in a floating state without contacting the cover member 103 in the internal space of the cover member 103. Specifically, the light emitting module 102 is held in the cover member 103 by a stem 107 protruding along the optical axis from the driving device 123 attached to the inside of the attachment portion 134.

[Semi-reflective member]
In the present embodiment, the semi-reflective member 104 is a member attached so as to protrude from the first member 131 constituting the cover member 103 toward the light emitting unit 121 side. The semi-reflective member 104 has a function of transmitting part of the light emitted from the light emitting unit 121 toward the first member 131 and reflecting the rest toward the base 101 side.

  According to the illumination device 100 of the present embodiment, a portion other than the base 101 serves as the transmission part 133, and a light emitting part that is separated from the diameter of the opening of the base 101 by using a relatively large light emitting module 102. 121 light can be reflected by the semi-reflective member 104 in the direction of the base 101, so that the entire optical axis 125 of the light emitting module 102 is the central axis, and is widened to the base 101 side (for example, 300 °) wider than the light emitting module 102. It can be set as the illuminating device 100 which has light distribution.

  According to the illumination device 100 as described above, a part of the light emitted from the light emitting unit 121 made of a semiconductor light emitting element is reflected to the light emitting unit 121 side by the semi-reflective member 104 attached to the cover member 103, and wide. A light distribution angle can be obtained.

  In particular, a portion other than the base 101 is used as a transmission part 133 through which light from the light emitting module 102 is transmitted, and a light emitting module 102 larger than the base 101 is accommodated inside, so that a wide light distribution distribution like a conventional incandescent bulb is obtained. The lighting device 100 can be provided.

  The present invention is not limited to the above embodiment. For example, another embodiment realized by arbitrarily combining the components described in this specification and excluding some of the components may be used as an embodiment of the present invention. In addition, the present invention includes modifications obtained by making various modifications conceivable by those skilled in the art without departing from the gist of the present invention, that is, the meaning of the words described in the claims. It is.

  For example, the shape of the cover member is a dome shape, but the shape of the cover member 103 is not particularly limited, and may be an elongated shape as a whole, or may be a three-dimensional shape or a rectangle having a flat surface in part. .

  Further, the light emitting unit 121 is not limited to being arranged in a ring shape, and the light emitting unit 121 may be arranged inside the ring (for example, on the entire optical axis 125). The light emitting unit 121 may emit light in a planar shape.

  Moreover, the light emission part 121 may be arrange | positioned not only on a plane but in three dimensions. For example, this is a case where the individual optical axes 124 of the light emitting units 121 are arranged in a radial pattern.

  Further, the shape of the semi-reflective member 104 is not particularly limited, and may be a hollow shape as shown in FIG. Moreover, as shown in FIG. 8, you may provide the surface which cross | intersects (orthogonal) with respect to the whole optical axis 125. FIG.

  In the above embodiment, the light emitting unit 121 has been described as emitting white light by the semiconductor light emitting element that emits blue light and the yellow phosphor, but the present invention is not limited thereto. For example, what emits white light using the resin member containing red fluorescent substance and green fluorescent substance may be used.

  Further, a plurality of light emitting portions 121 each composed of a semiconductor light emitting element that emits RGB without using a resin member may be provided, and white light may be emitted as a whole.

  Further, as the semiconductor light emitting element, a semiconductor laser, an organic EL (Electro Luminescence), or the like may be used.

  The light emitting unit 121 may be not only a package type but also a COB (Chip On Board) type light emitting unit 121 having a structure in which an LED chip (bare chip) is directly mounted on the substrate 122.

  In addition, the arrangement shape of the light emitting units 121 is not limited to the circumferential shape, and may be a polygonal shape such as a rectangle or a linear shape.

  The present invention is useful as a lighting device having a wide light distribution angle.

DESCRIPTION OF SYMBOLS 100 Illuminating device 101 Base 102 Light emitting module 103 Cover member 104 Semi-reflective member 121 Light emission part

Claims (6)

A lighting device comprising: a light emitting unit composed of a semiconductor light emitting element; and a cover member that covers the light emitting unit,
It is attached to the cover member so as to protrude from the cover member toward the light emitting unit, transmits a part of the light emitted from the light emitting unit toward the cover member, and the rest to the light emitting unit side. An illuminating device provided with a semi-reflective member to be reflected. The lighting device is
A plurality of the light emitting units are provided,
The semi-reflective member is
The lighting device according to claim 1, wherein the lighting device is disposed at a position that does not intersect with an individual optical axis that is an optical axis of the light emitting unit. The semi-reflective member is
The illuminating device according to claim 2, wherein the illuminating device is disposed at a position intersecting with the entire optical axis that is the entire optical axis of the illuminating device. The light emitting unit
Placed on the circumference,
The semi-reflective member is
The lighting device according to claim 2, wherein the lighting device has a conical shape or a truncated cone shape, and is arranged so that a central axis coincides with an entire optical axis that is an entire optical axis of the lighting device. further,
With a base,
A light emitting module having the light emitting unit,
The cover member is
The illumination device according to any one of claims 1 to 4, wherein the illumination device is a glove having an attachment portion to which the base is attached and a transmission portion that transmits light emitted from the light emitting portion. The light emitting module
The diameter of the virtual circumscribed circle is longer than the diameter of the base,
The cover member is
The lighting device according to claim 5, comprising a first member and a second member that house the light emitting module in a joined state.

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