WO2013161152A1 - ランプ及び照明装置 - Google Patents
ランプ及び照明装置 Download PDFInfo
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- WO2013161152A1 WO2013161152A1 PCT/JP2013/001353 JP2013001353W WO2013161152A1 WO 2013161152 A1 WO2013161152 A1 WO 2013161152A1 JP 2013001353 W JP2013001353 W JP 2013001353W WO 2013161152 A1 WO2013161152 A1 WO 2013161152A1
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- Prior art keywords
- led
- light
- lamp according
- housing
- lamp
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/20—Light sources comprising attachment means
- F21K9/27—Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
- F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Definitions
- the present invention relates to a lamp and a lighting device, for example, a straight tube type LED lamp using a light emitting diode (LED) and a lighting device including the same.
- a lighting device for example, a straight tube type LED lamp using a light emitting diode (LED) and a lighting device including the same.
- LED light emitting diode
- LED is expected to be a new light source in various lamps such as fluorescent lamps and incandescent lamps because of its high efficiency and long life, and research and development of lamps using LEDs (LED lamps) is being promoted. ing.
- a straight tube type LED lamp that replaces a straight tube type fluorescent lamp having an electrode coil at both ends, or an arc tube having an electrode coil at both ends of a glass bulb.
- Patent Document 1 discloses a conventional straight-tube LED lamp.
- Patent Document 2 discloses a conventional bulb-type LED lamp.
- the LED is configured as an LED module.
- the LED module includes a surface mount type (SMD: Surface Mount Device), a COB type (Chip On Board), and the like.
- SMD type LED module uses a package type LED element in which an LED chip mounted in a resin-molded non-translucent container (cavity) is sealed with a phosphor-containing resin. It can be manufactured by mounting a plurality of LED elements on a substrate.
- COB type LED module can be manufactured by directly mounting a plurality of LED chips (bare chips) on a substrate and sealing them with a phosphor-containing resin.
- the LED module is housed in a housing.
- the LED module has a plurality of LEDs (LED elements and bare chips) arranged at regular intervals. In this case, a region with a high light emission luminance (portion where the LED is mounted) and a region with a low light emission luminance (portion where the LED is not mounted) appear repeatedly along the LED alignment direction. A difference in luminance occurs in the illumination light.
- the light source is an LED
- the above-described luminance difference is increased because the LED has a characteristic of a Lambertian light distribution and a relatively narrow emission angle.
- the conventional LED lamp has a problem in that a brightness difference is generated in the light of the LED transmitted through the housing, which gives the user a sense of light graininess (hereinafter referred to as “graininess”).
- This invention was made in order to solve such a problem, and it aims at providing the lamp
- an aspect of the lamp according to the present invention includes a long housing having a light diffusing portion and a plurality of lamps disposed in the housing along the longitudinal direction of the housing.
- a light-emitting element wherein a half-value width of a luminance distribution obtained when light of each of the plurality of light-emitting elements passes through the outermost portion of the lamp is y (mm), and the adjacent light-emitting elements When the light emission center interval of the element is x (mm), the relationship of y ⁇ 1.09x is satisfied.
- y ⁇ 1.21x may be satisfied.
- x ⁇ 8 may be satisfied.
- x ⁇ 8 may be satisfied.
- y ⁇ 1.49x may be satisfied.
- x ⁇ 8 may be satisfied.
- x ⁇ 8 may be satisfied.
- y> 1.49x may be satisfied.
- the light diffusion portion may be formed on an inner surface or an outer surface of the casing.
- the light diffusion part may be a light diffusion sheet or a light diffusion film.
- the light diffusing portion may be a lens structure provided inside or outside the casing.
- the light diffusion portion may be a concave portion or a convex portion formed in the casing.
- a long substrate disposed in the casing may be further provided, and each of the plurality of light emitting elements may be mounted on the substrate.
- the lamp further comprises a long base disposed in the housing, and a plurality of containers mounted on the base, and the plurality of light emitting elements. Each may be mounted on each of the plurality of containers.
- the casing may be a straight tube made of glass.
- the casing may be a straight tube made of polycarbonate.
- an aspect of the lighting device according to the present invention includes any one of the lamps described above.
- the present invention it is possible to realize a lamp and a lighting device that can suppress the graininess before the user can feel it.
- FIG. 1 is a schematic perspective view of a straight tube LED lamp according to an embodiment of the present invention.
- FIG. 2 is an exploded perspective view of the straight tube LED lamp according to the embodiment of the present invention.
- FIG. 3A is a cross-sectional view of the main part in the tube axis direction of the straight tube LED lamp according to the embodiment of the present invention.
- FIG. 3B is a cross-sectional view of the straight tube LED lamp according to the embodiment of the present invention taken along line A-A ′ of FIG. 3A.
- FIG. 4 is a plan view of the LED module (COB) according to the embodiment of the present invention.
- FIG. 5 is a plan view of an LED module (SMD) according to another embodiment of the present invention.
- FIG. 1 is a schematic perspective view of a straight tube LED lamp according to an embodiment of the present invention.
- FIG. 2 is an exploded perspective view of the straight tube LED lamp according to the embodiment of the present invention.
- FIG. 3A is a cross-sectional view
- FIG. 6A is a diagram illustrating an example of a luminance distribution of light from one LED that has passed through a diffusing member.
- FIG. 6B is a diagram showing a relationship between the LED position and the combined luminance when a plurality of LEDs having the luminance characteristics of FIG. 6A are arranged.
- FIG. 7A shows the half-value width of the light transmitted through the diffusing member per LED when the measurement material (the type of LED and the main material of the diffusing member) is changed, the emission center distance of the LED when a plurality of the LEDs are arranged, and It is a figure which shows the relationship with a brightness
- FIG. 7B is a diagram when the values shown in FIG.
- FIG. 7A are plotted, in which the half-value width of the light transmitted through the diffusing member per LED, the interval between the emission centers of the LEDs when a plurality of the LEDs are arranged, and the luminance uniformity It is a figure which shows the relationship.
- FIG. 8 is a diagram showing the relationship between the diffusion material adhesion amount of the housing and the luminance uniformity in the straight tube LED lamp according to the embodiment of the present invention and the comparative example.
- FIG. 8 is a diagram showing the relationship between the diffusion material adhesion
- FIG. 9A is a plan view showing a state in which the straight tube LED lamp in the case of “Comparative Example” in FIG. 8 is turned on
- FIG. 9B is the “present invention” in FIG. It is a top view which shows a state when the straight tube
- FIG. 10 is a schematic perspective view of the illumination device according to the embodiment of the present invention.
- an LED lamp using a long casing has a problem of feeling grainy. To solve this problem, it is self-evident that if the light diffusibility of the lamp is increased, the graininess is eliminated. However, simply increasing the diffusivity results in a decrease in luminous flux as a side effect, resulting in a decrease in lamp illuminance.
- the inventors of the present application found a uniform area that can effectively suppress the graininess by minimizing the decrease in luminous flux and succeeded in quantifying the area. . That is, according to the present invention, it was possible to obtain the knowledge that the graininess can be quantified in relation to the luminance uniformity by adopting the luminance distribution of one light source emitted from the outermost lamp as a parameter.
- the present invention has been accomplished in this way, and thereby, the problems (1) and (2) have been solved.
- the luminance uniformity is the luminance uniformity when measured in the central region in the longitudinal direction of the casing.
- FIG. 1 is a schematic perspective view of a lamp according to an embodiment of the present invention.
- FIG. 2 is an exploded perspective view of the straight tube LED lamp according to the embodiment of the present invention.
- a straight tube LED lamp 1 is a straight tube LED lamp that replaces a conventional straight tube fluorescent lamp, and includes an LED module 10 and an LED module.
- a long casing 20 that houses the power supply base 10
- a power supply base (power supply side base) 30 that is a first base provided at one end in the longitudinal direction (tube axis direction) of the casing 20,
- a grounding base (non-power-feeding base) 40 that is a second base provided at the other end of the body 20 in the longitudinal direction; a first base 50 and a second base 54 on which the LED module 10 is disposed;
- a connector 60 for supplying power to the LED module 10, a reflection member 70 for reflecting light emitted from the LED module 10 in a predetermined direction, and an attachment member 80 for attaching the first base 50 to the housing 20.
- LED module 10 And a lighting circuit 90 for causing the.
- a one-side power feeding method is adopted in which power is fed from one side of only the power feeding base 30.
- FIG. 3A is a cross-sectional view of the main part in the tube axis direction of the straight tube LED lamp according to the embodiment of the present invention.
- FIG. 3B is a cross-sectional view of the straight tube LED lamp according to the embodiment of the present invention taken along line A-A ′ of FIG. 3A.
- LED module In the straight tube type LED lamp 1, as shown in FIG. 2, a plurality of long LED modules 10 are arranged along the tube axis direction of the housing 20.
- FIG. 4 is a plan view of the LED module according to the embodiment of the present invention.
- the LED module 10 is a COB type light emitting module in which LED chips are directly mounted on a substrate, and includes a substrate 11, a plurality of LEDs (bare chips) 12, and a seal that seals the LEDs 12.
- the stop member 13 and the electrode terminal 14 which receives supply of the electric power for light-emitting LED12 from the module exterior are provided.
- the LED module 10 includes a metal wire for supplying power to each LED 12, a gold wire for electrically connecting the LED 12 and the metal wire, and a protection element for protecting the LED 12. Etc. are provided.
- the substrate 11 is an LED mounting substrate for mounting the LED 12.
- a rectangular substrate that is long in the tube axis direction of the housing 20 is used as the substrate 11.
- the LED 12 is mounted only on one surface of the substrate 11.
- the substrate 11 includes a first surface (first main surface) 11a on which the LED 12 is mounted and a second surface (second main surface) on the opposite side of the first surface 11a. Surface) 11b.
- the LED module 10 is mounted on the second base 54 so that the second surface 11b of the substrate 11 and the mounting surface of the second base 54 are in contact with each other.
- a translucent ceramic substrate made of alumina, aluminum nitride or the like, a metal base substrate made of a metal such as an aluminum alloy, a glass substrate, or a flexible flexible substrate (FPC) made of a resin. Etc. can be used.
- the LED 12 is an example of a light emitting element, and is directly mounted on the substrate 11. As shown in FIGS. 2 and 4, a plurality of LEDs 12 are arranged on the substrate 11 in a line along the longitudinal direction of the substrate 11. Each LED 12 is a bare chip that emits monochromatic visible light, and is die-bonded on the substrate 11 by a die attach material (die bond material). For example, a blue LED chip that emits blue light when energized can be used as the LED 12. In the present embodiment, all the LEDs 12 in the housing 20 have the same light characteristics.
- Each LED 12 can be configured to be a serial connection, a parallel connection, or a combination connection of a series connection and a parallel connection by metal wiring or gold wire.
- the sealing member 13 is a phosphor-containing resin that includes a phosphor that is a light wavelength converter, and converts the wavelength of light from the LED 12 to a predetermined wavelength (color conversion), and also seals the LED 12 with a resin.
- the sealing member 13 is linearly formed along the arrangement direction of the LEDs 12 so as to collectively seal all the LEDs 12 on the substrate 11. In this way, the sealing member 13 does not seal the individual LEDs 12 but collectively seals the plurality of LEDs 12, so that white light is also emitted from the sealing member 13 between the adjacent LEDs 12. Can do. Thereby, since a light emission area
- the sealing member 13 when the LED 12 is a blue LED, a phosphor-containing resin in which YAG (yttrium, aluminum, garnet) -based yellow phosphor particles are dispersed in a silicone resin is used as the sealing member 13 in order to obtain white light. be able to. As a result, the yellow phosphor particles are excited by the blue light of the blue LED chip to emit yellow light, so that the sealing member 13 emits white light by the excited yellow light and the blue light of the blue LED chip. Is done.
- the sealing member 13 may also contain a light diffusing material such as silica.
- the electrode terminal 14 is a power feeding unit (external connection terminal) that receives DC power for causing the LED 12 to emit light.
- the electrode terminal 14 in this Embodiment is comprised by the socket type
- the conductive pins are electrically connected to metal wiring formed on the substrate 11.
- the electrode terminal 14 is supplied with power from the connector 60 by mounting the mounting portion 61 of the connector 60 on the electrode terminal 14 (socket).
- the LED module 10 is configured as described above. In the present embodiment, all the LED modules 10 arranged in the housing 20 have the same configuration.
- the COB type LED module 10 is used, but an SMD type LED module 10A as shown in FIG. 5 may be used.
- the SMD type LED module 10 ⁇ / b> A includes a substrate 11 and a plurality of LED elements 15 ⁇ / b> A mounted in a row on the substrate 11.
- the LED element 15A includes a package (cavity) 16A that is a container formed of a non-translucent resin (white resin or the like), an LED 12 (LED chip) mounted on the bottom of the recess of the package 16A, and a recess of the package 16A.
- a sealing member 13 which is a phosphor-containing resin that is filled and seals the LED 12 and a metal wiring or the like are provided.
- the plurality of LED elements 15 ⁇ / b> A are electrically connected to each other and to the electrode terminal 14 through a metal wiring pattern formed on the substrate 11.
- the casing 20 is a straight tube (tube) having translucency, and is an outer member made of a long cylindrical body having openings at both ends as shown in FIG.
- the housing 20 houses the LED module 10, the first base 50, the second base 54, the lighting circuit 90, and the like.
- casing 20 can be comprised with a translucent material and can use a glass tube or a plastic tube.
- a straight tube (glass tube) made of soda lime glass having a silica (SiO 2 ) of 70 to 72%, or a straight tube (plastic tube) made of a resin material such as acrylic or polycarbonate. ) can be used.
- the housing 20 has a light diffusing unit having a light diffusing function for diffusing light from the LED module 10.
- the light diffusion portion include a light diffusion sheet or a light diffusion film formed on the inner surface or the outer surface of the housing 20.
- a milky white light diffusion film can be formed by attaching a resin or a white pigment containing a light diffusion material (fine particles) such as silica or calcium carbonate to the inner surface or the outer surface of the housing 20.
- Other light diffusing portions include a lens structure provided inside or outside the housing 20, or a concave portion or a convex portion formed in the housing 20.
- the case 20 can be provided with a light diffusion function (light diffusion unit) by printing a dot pattern on the inner surface or the outer surface of the case 20 or by processing a part of the case 20.
- casing 20 itself can also be made to have a light-diffusion function (light-diffusion part) in the housing
- the structure of the straight tubular casing 20 may be a half structure in which the cross-sectional shape in the radial direction is substantially hemispherical.
- the power supply cap 30 is a cap for supplying power to the LED module 10, and power for turning on the LEDs 12 of the LED module 10 is supplied from outside the lamp (commercial power supply, DC power supply for LED lighting, etc.). receive.
- the power supply cap 30 is formed in a substantially bottomed cylindrical shape and is provided so as to cover one end of the housing 20.
- the power supply base 30 in the present embodiment includes a power supply base body 31 made of a synthetic resin such as polybutylene terephthalate (PBT), and a pair of power supply pins 32 made of a metal material such as brass. Consists of.
- the power supply base body 31 can be disassembled into upper and lower halves with a plane passing through the tube axis of the housing 20 as a split surface, and is constituted by a first power supply base body part 31a and a second power supply base body part 31b. .
- the power feeding base 30 is fed by the first power feeding base body 31a and the second power feeding base body 31b after the power supply pin 32 is electrically connected to the socket of the lighting circuit 90 via a lead wire.
- the first feeding base body 31a and the second feeding base body 31b are screwed in a state in which the pin 32 and the end of the casing 20 are sandwiched so as to cover the end of the casing 20 Fixed.
- the pair of power supply pins 32 are configured to protrude outward from the bottom of the power supply base body 31, and are supplied from an external device such as a lighting fixture as power for lighting the LEDs 12 of the LED module 10. Function to receive power. For example, by attaching the power supply base 30 to the socket of the lighting fixture, the pair of power supply pins 32 is in a state of receiving AC power from a commercial 100V AC power supply or DC power from the LED lighting power supply.
- the pair of power supply pins 32 are connected to the lighting circuit 90 in the housing 20 by lead wires, and the AC power or DC power received by the pair of power supply pins 32 is supplied to the lighting circuit 90.
- the lighting circuit 90 has a DC function.
- the lighting circuit is DC. Has a function for adjusting the positive and negative directions to a certain direction.
- the grounding cap 40 is grounded to the second metal base 54 and allows an abnormal current generated in the lamp to flow to the ground via the lighting fixture.
- the grounding cap 40 has a substantially bottomed cylindrical shape, and is provided so as to cover the other end of the housing 20.
- the grounding base 40 in the present embodiment is composed of a grounding base body 41 made of a synthetic resin such as PBT and a single grounding pin 42 made of a metal material such as brass.
- the ground base body 41 can be disassembled into upper and lower halves with a plane passing through the tube axis of the housing 20 as a split surface, and is constituted by a first ground base body part 41a and a second ground base body part 41b.
- the grounding base 40 has the grounding pin 42 and the housing 20 formed by the first grounding base body 41a and the second grounding base body 41b after the ground pin 42 is attached to the first base 50 by the connecting member 43.
- the first grounding base body 41a and the second grounding base body 41b are screwed in a state in which the end of the housing 20 is sandwiched, so that the end of the housing 20 is covered.
- the ground pin 42 is configured to protrude outward from the bottom of the base body 41 for grounding.
- the earth pin 42 is connected and fixed to the second base 54 and a screw (not shown) by an L-shaped metal connection member 43 (attachment fitting).
- the earth pin 42 is grounded via a lighting fixture.
- Each of the first base 50 and the second base 54 is made of metal, functions as a heat sink that dissipates heat generated in the LED module 10, and serves as a base for mounting and fixing the LED module 10. Function.
- the first base 50 is a member that constitutes the outline of the heat sink, and is configured in a long shape having substantially the same length as the entire length of the housing 20, as shown in FIG.
- the first base 50 can be formed, for example, by bending a metal plate such as a galvanized steel plate.
- the first base 50 includes a long bottom portion (bottom plate portion), first wall portions 51 formed on both ends of the first base 50 in the short direction (the width direction of the substrate 11), and first 2 walls 52.
- the first wall 51 and the second wall 52 are formed in a partition shape by bending a metal plate constituting the first base 50.
- the substrate 11 of the LED module 10 is sandwiched between the first wall portion 51 and the second wall portion 52, and the LED module 10 is sandwiched between the first wall portion 51 and the second wall portion 52.
- the substrate 11 is arranged on the first base 50 in a state where the movement in the short direction is restricted.
- the first wall 51 is formed with a plurality of first protrusions 51 a that protrude from the first wall 51 toward the second wall 52.
- the second wall 52 is formed with a plurality of second protrusions 52 a that protrude from the second wall 52 toward the first wall 51.
- the first protrusion 51 a and the second protrusion 52 a are configured as locking claws that lock on the first surface 11 a of the substrate 11 in the LED module 10.
- the LED module 10 (substrate 11) is restricted from moving in a direction perpendicular to the first surface 11a of the substrate 11, and the LED module 10 is moved upward by the first protrusion 51a and the second protrusion 52a. It is fixed to the first base 50 so as not to jump out.
- an urging portion 53 for urging the second base 54 is formed at the bottom of the first base 50.
- the urging portion 53 can be formed as a leaf spring formed by cutting and raising a part of a metal plate constituting the first base 50, for example.
- the urging portion 53 configured in this manner is configured to abut against the reflecting member 70, and exerts a pressing force against the reflecting member 70 (second base 54) by urging by the elastic force of the leaf spring. Has been granted. Thereby, LED module 10 (board
- the second base 54 is an intermediate plate heat sink that is formed of a long substrate and is disposed between the first base 50 and the substrate 11 of the LED module 10.
- the LED module 10 (substrate 11) is placed on the second base 54. That is, the LED module 10 is disposed on the second base 54 in a state where the second base 54 and the second surface 11 b of the substrate 11 are in contact with each other.
- a lighting circuit 90 is also placed on the second base 54.
- the second base 54 is preferably made of a high thermal conductivity material such as a metal, and in this embodiment, an aluminum plate made of aluminum having a thermal conductivity of 237 [W / m ⁇ K]. Was used.
- the connector 60 is a conductive wire that electrically connects adjacent LED modules 10, and a mounting portion (connector portion) 61 that is attached to the electrode terminal 14 of the LED module 10 and the LED module 10 via the electrode terminal 14. And a power supply line 62 for passing power supplied to the power supply.
- the mounting portion 61 is provided at both ends of the power supply line 62, and has a substantially rectangular resin molded portion configured to be fitted to the electrode terminal 14, and a conductive portion provided in the resin molded portion. Consists of.
- the power supply line 62 is configured by a lead wire called a harness.
- the connector 60 is configured to supply DC power
- the power supply line 62 includes a positive voltage supply line that supplies a positive voltage and a negative voltage supply line that supplies a negative voltage.
- the LED module 10 closest to the power supply cap 30 and the lighting circuit 90 are electrically connected by the connector 60, so that the positive and negative directions from the lighting circuit 90 to the LED module 10 have appropriate values. Arranged DC power is supplied. Further, adjacent LED modules 10 are also supplied with power from one LED module 10 to the other LED module via the connector 60.
- the reflecting member 70 is configured to reflect light emitted from the LED module 10 in a certain direction in order to improve the light extraction efficiency of the lamp.
- the reflecting member 70 is made of a material having electrical insulating properties and light reflecting properties.
- the reflecting member 70 can be made by processing an insulating reflecting sheet made of a biaxially stretched polyester (PET) film or the like.
- the reflecting member 70 is processed to have a U-shaped cross section, and a first reflecting surface portion that is in surface contact with the inner surface of the first wall portion 51 in the first base 50 and a second wall portion 52. And a second reflecting surface portion that is in surface contact with the inner surface. Thereby, the light from the LED module 10 is reflected by the first reflection surface portion and the second reflection surface portion of the reflection member 70.
- the reflecting member 70 is disposed between the first base 50 and the second base 54. Specifically, the reflecting member 70 is placed on the step portion of the first base 50, and the surface of the reflecting member 70 on the first base 50 side is an urging portion 53 (not shown) of the first base 50. ).
- an attachment member 80 is attached to an opening formed at the bottom of the first base 50.
- the attachment member 80 is attached to the first base 50 so that the first base 50 is movable with respect to the longitudinal direction of the first base 50.
- the mounting member 80 includes a hooking piece 81 that hooks into an opening formed in the bottom of the first base 50 and a recess 82 that faces the inner surface of the housing 20.
- the engaging piece 81 is arranged in the longitudinal direction of the first base 50 so as to be spaced from the edge of the opening at the bottom of the first base 50 and to be engaged with the edge of the opening.
- the hooking piece 81 is formed in a hook shape so as to be hooked on the surface of the bottom of the first base 50 on the side of the housing 20.
- the concave portion 82 of the attachment member 80 is filled with an adhesive 83 such as silicone resin, and the attachment member 80 and the housing 20 are bonded and fixed by the adhesive 83.
- the attachment member 80 is bonded and fixed to the housing 20, but is movable with respect to the first base 50, and the attachment member 80 slides with respect to the first base 50. Is configured to do.
- the engaging piece 81 of the attachment member 80 and the first base 50 are configured to slide.
- the lighting circuit 90 is an LED lighting circuit (LED control circuit) for controlling the lighting state of the LED 12 in the LED module 10, and is a circuit that converts input AC power into DC power and outputs it, or is installed separately. And a circuit having a function of adjusting the positive and negative directions of the direct current power from the LED lighting power source to an appropriate direction.
- the lighting circuit 90 includes a circuit board 90a and a circuit element group 90b composed of a plurality of circuit elements mounted on the circuit board 90a.
- the circuit board 90a is a printed board on which a predetermined wiring pattern (not shown) for wiring the mounted electronic components to each other is formed.
- a predetermined wiring pattern (not shown) for wiring the mounted electronic components to each other is formed.
- a glass epoxy board or the like can be used.
- the circuit element group 90b is composed of a plurality of circuit elements for lighting the LEDs 12 of the LED module 10.
- the circuit element group 90b includes, for example, a diode bridge circuit (rectifier circuit) that rectifies the input AC power in full wave, a fuse element, and the like.
- the circuit element group 90b may include a resistor, a capacitor, a coil, a diode, a transistor, or the like as necessary.
- the lighting circuit 90 includes an input socket 90c (input unit) that receives AC power or DC power from a pair of power supply pins 32 provided on the power supply cap 30, and a positive and negative direction with respect to the LED module 10. And an output socket 90d (output unit) that outputs DC power adjusted to an appropriate value.
- An input connector terminal electrically connected to the pair of power supply pins 32 is inserted into the input socket 90c through lead wires.
- an output connector terminal electrically connected to the LED module 10 is inserted into the output socket 90d through a lead wire.
- the input socket 90c and the output socket 90d are electrically connected to the circuit elements of the circuit element group 90b by a wiring pattern formed on the circuit board 90a.
- the lighting circuit 90 configured in this way is placed on the second base 54 and covered with the lighting circuit cover 91.
- the lighting circuit cover 91 is made of an insulating resin and protects the lighting circuit 90.
- the LED module 10 In the straight tube type LED lamp 1 configured as described above, the LED module 10, the first base 50, the second base 54, the connector 60, the reflecting member 70, the mounting member 80, the lighting circuit 90, and the lighting circuit cover 91.
- the power supply pin 32 and the ground pin 42 are integrated as a long light source module. That is, the light source module in which the components are integrated is in a state in which the electrical and physical connections between the components are completed. Then, after the light source module is inserted into the housing 20, the power supply base body 31 and the ground base body 41 are attached to both ends of the housing 20, thereby completing the straight tube LED lamp 1.
- the LED lamp since a plurality of LEDs are arranged at regular intervals in the housing, a high luminance region (a portion where the LED is mounted) and a low luminance region (the LED is mounted) in the LED arrangement direction. The part that is not) appears repeatedly. For this reason, there is a problem that the light of the LED lamp gives the user a sense of grain due to the luminance difference between the high luminance region and the low luminance region.
- the present inventors tried to eliminate the graininess by suppressing the luminance difference by giving the casing a desired light diffusion function.
- FIG. 6A is a diagram illustrating an example of a luminance distribution of light from one LED that has passed through a diffusing member.
- FIG. 6B is a diagram showing a relationship between the LED position and the combined luminance when a plurality of LEDs having the luminance characteristics of FIG. 6A are arranged.
- the luminance distribution of the transmitted light when the light from one LED passes through the diffusing member is a normal distribution that continuously spreads in all directions around the maximum luminance (about 15,000 cd / m 2 ). It has become.
- the position showing the maximum luminance is the light emission center of the LED. Note that the example of FIG. 6A shows the results when measurement is performed with the luminance measurement device (HiLAND RISA) 130 cm away from the diffusion member, which is the measurement object, and the horizontal axis width of the measurement screen is adjusted to 30 cm.
- a luminance distribution synthesized when a plurality of LEDs having such luminance characteristics are arranged in a straight line at equal intervals is a distribution as shown in FIG. 6B.
- the distribution is such that the maximum luminance (about 28,000 cd / m 2 ) and the minimum luminance (about 25,000 cd / m 2 ) appear repeatedly in the LED arrangement direction.
- the present inventors have determined that the half-value width (FIG. 6A) in the luminance distribution of one LED, the emission center interval (FIG. 6B) between adjacent LEDs when a plurality of LEDs are arranged, and the luminance I found out that there is a correlation with uniformity.
- the full width at half maximum is FWHM (Full Width at Half Maximum).
- the light emission center interval is the interval between the centers (maximum luminance) of the luminance distribution of each LED in adjacent LEDs.
- FIG. 7A shows measurement materials (types of LEDs and main materials of the diffusing member) with respect to the half-value width of the light transmitted through the diffusing member per LED and the light emission center interval and luminance uniformity when a plurality of the LEDs are arranged. It is a figure which shows each value when changing.
- FIG. 7B is a diagram when the values shown in FIG. 7A are plotted.
- COB is a COB type LED module, and one LED is a bare chip.
- SMD is an SMD type module, and one LED is a package type LED element.
- Glass is a glass plate with a diffusion film formed on the surface
- Polycarbonate is a material with a diffusion film formed on the surface or a light diffusing material mixed inside. This is a polycarbonate resin plate having a light diffusion function.
- the half value width of the luminance distribution obtained when the light of each of the plurality of LEDs passes through the diffusing member is y (mm), and the emission center interval between adjacent LEDs is x.
- y ⁇ x
- a linear approximation can be performed regardless of whether the material of the diffusion member that diffuses the light of the LED is glass or polycarbonate.
- the LED module can be linearly approximated regardless of whether it is an SMD type or a COB type. That is, it was found that the brightness uniformity of LEDs arranged in a line can be linearly approximated regardless of the type of diffusing member or LED module.
- the correlation coefficient R 2 in each straight line is 0.99 or 1.00
- the half-value width y of the luminance distribution, the light emission center interval x of the LED, and the luminance uniformity are highly correlated.
- the light emission center interval x is preferably 3 mm or more and 30 mm or less, but it has been confirmed that there is a high correlation at least in this range.
- the diffusion member in this experiment can be considered to correspond to the outermost part of the straight tube LED lamp 1 in the present embodiment. Therefore, as shown in FIGS. 7B and 7C, in the straight tube LED lamp 1, the housing 20 and the plurality of LEDs 12 arranged along the tube axis direction (longitudinal direction) of the housing 20 are y By configuring so as to satisfy the relationship of ⁇ 1.09x, the luminance uniformity can be 85% or more. Thereby, since the brightness difference between the high brightness area and the low brightness area brightness appearing in the arrangement direction of the plurality of LEDs 12 can be suppressed, it is possible to make the user feel almost no graininess.
- the outermost envelope of the lamp is the casing 20, but the present invention is not limited to this.
- FIG. 8 is a diagram showing the relationship between the diffusion material adhesion amount of the housing and the luminance uniformity in the straight tube LED lamp according to the embodiment of the present invention and the comparative example.
- FIG. 8 shows a result when a diffusion film is formed by attaching calcium carbonate as a diffusion material to silica / acrylic resin.
- the luminance uniformity is about 72%.
- the adhering amount of the diffusing material is 1.27 g, 1.33 g, 1.39 g, 1.45 g, and 1.51 g (invention)
- the luminance uniformity can be 90% or more. . Therefore, an LED lamp that does not give a grainy feeling can be realized by setting the amount of the diffusing material attached when the diffusion film is formed on the housing 20 to 1.27 g or more.
- a COB type LED module 10 in which LED elements are mounted at intervals of 5 mm and a glass tube housing 20 are used.
- the amount of adhesion is the case of a straight tube type LED lamp assuming a straight tube 40W type alternative, that is, the case where the length of the glass tube is about 1170 mm and the inner diameter is about 25 mm.
- FIG. 9A is a plan view when the straight tube LED lamp in the case of “Comparative Example” in FIG. 8 is turned on
- FIG. 9B is the “present invention” in FIG. 8 (1.27 g). It is a top view when the straight tube type LED in the case of) is turned on.
- a COB type LED module 10 in which LED elements are mounted at intervals of 5 mm and a glass tube housing 20 are used.
- the straight tube LED lamp according to the comparative example feels grainy.
- the straight tube LED lamp according to the present invention does not feel any graininess.
- the straight tube LED lamp 1 it is preferable that y ⁇ 1.21x.
- casing 20 can be 90% or more, it can suppress to a level which cannot recognize a graininess substantially.
- 1.21x ⁇ y ⁇ 1.49x may be satisfied.
- casing 20 can be 90% or more
- diffusion can be suppressed by restrict
- y> 1.49x may be set.
- y ⁇ 1.21x and x ⁇ 8 may be satisfied.
- the manufacturing cost can be kept low, and the low-density mounting can be achieved, so that the light emission efficiency at the single LED level can be improved.
- y ⁇ 1.21x and x ⁇ 8 may be satisfied.
- a graininess can be suppressed to the level which cannot be recognized substantially.
- the distance between the light emission centers can be reduced to provide the casing 20 with low diffusibility, light loss in the casing 20 can be reduced. Further, since the distance from the LED (light source) to the housing 20 can be reduced, a small LED lamp can be realized.
- 1.21x ⁇ y ⁇ 1.49x and x ⁇ 8 may be satisfied.
- the graininess be suppressed to a level that cannot be substantially recognized, but excessive diffusion can be suppressed by limiting the upper limit of the luminance uniformity.
- the manufacturing cost can be kept low, and the low-density mounting can be achieved, so that the light emission efficiency at the single LED level is improved. Can do.
- the straight tube LED lamp 1 in the straight tube LED lamp 1 according to the present embodiment, 1.21x ⁇ y ⁇ 1.49x and x ⁇ 8 may be satisfied.
- diffusion can be suppressed by restrict
- the distance between the light emission centers can be reduced to provide the casing 20 with low diffusibility, light loss in the casing 20 can be reduced.
- casing 20 can be made small, a small LED lamp is realizable.
- FIG. 10 is a schematic perspective view of the illumination device according to the embodiment of the present invention.
- the illuminating device 2 which concerns on embodiment of this invention is a base light, Comprising: The straight tube
- the straight tube LED lamp 1 is a straight tube LED lamp 1 according to the above-described embodiment, and is used as a light source for illumination of the illumination device 2. In the present embodiment, as shown in FIG. 10, two straight tube LED lamps 1 are used.
- the lighting fixture 100 includes a pair of sockets 110 that are electrically connected to the straight tube LED lamp 1 and that holds the straight tube LED lamp 1, and a fixture main body 120 to which the socket 110 is attached.
- the instrument main body 120 can be formed by, for example, pressing an aluminum steel plate.
- the inner surface of the instrument main body 120 is a reflecting surface that reflects light emitted from the straight tube LED lamp 1 in a predetermined direction (for example, downward).
- the lighting fixture 100 configured in this way is mounted on a ceiling or the like via a fixture.
- the lighting fixture 100 may incorporate a circuit for controlling the lighting of the straight tube LED lamp 1 or the like.
- the cover member may be provided so that a straight tube
- the one-side power feeding method in which power is fed from only one side of the feeding base 30 is used, but a both-side power feeding method in which power is fed from both sides may be adopted.
- the power supply base 30 may be used as the second base instead of the ground base 40.
- the grounding cap 40 is used as the second base.
- a base that does not have a grounding function and simply functions as a mounting portion with a lighting fixture may be used as the second base.
- the power supply base 30 is an L-shaped base having the power supply pin 32 of an L-shaped pin, but may be a G13 base.
- the grounding base 40 may be a G13 base.
- the LED module is configured to emit white light by the blue LED chip and the yellow phosphor, but the present invention is not limited to this.
- a phosphor-containing resin containing a red phosphor and a green phosphor may be used and combined with this and a blue LED to emit white light.
- an ultraviolet LED chip that emits ultraviolet light having a shorter wavelength than a blue LED chip, and blue phosphor particles, green phosphor particles, and red that are mainly excited by ultraviolet light and emit blue light, red light, and green light.
- the phosphor particles may be configured to emit white light.
- the LED is exemplified as the light emitting element.
- a semiconductor light emitting element such as a semiconductor laser
- an EL element such as an organic EL (Electro Luminescence) or an inorganic EL, or other solid light emitting elements may be used. Good.
- the straight tube type LED lamp has been described.
- the present invention can also be applied to a round tube type LED lamp constituted by an annular round tube.
- the present invention can be widely used in lamps using light emitting elements such as LEDs, for example, straight tube LED lamps and lighting devices including the same.
Abstract
Description
上述のとおり、長尺状の筐体を用いたLEDランプでは、粒々感を感じるという課題がある。この課題に対して、ランプの光拡散性を高めれば粒々感を解消することは自明のことである。しかしながら、単に拡散性を高めただけでは、その副作用として光束が低下してしまい、ランプ照度が低下してしまう。
まず、本発明の実施の形態に係る直管形LEDランプ1の全体構成について、図1及び図2を用いて説明する。図1は、本発明の実施の形態に係るランプの概観斜視図である。また、図2は、本発明の実施の形態に係る直管形LEDランプの分解斜視図である。
直管形LEDランプ1では、図2に示すように、長尺状のLEDモジュール10が筐体20の管軸方向に沿って複数配置される。ここで、LEDモジュール10の詳細構成について、図2を参照しながら、図4を用いて説明する。図4は、本発明の実施の形態に係るLEDモジュールの平面図である。
筐体20は、透光性を有する直管(チューブ)であり、図2に示すように、両端部に開口を有する長尺筒体からなる外郭部材である。筐体20には、LEDモジュール10、第1基台50、第2基台54、及び点灯回路90等が収納される。
給電用口金30は、LEDモジュール10に電力を供給するための口金であり、LEDモジュール10のLED12を点灯させるための電力を、ランプ外部(商用電源、あるいはLED点灯用の直流電源、等)から受ける。給電用口金30は、略有底円筒形状に構成されており、筐体20の一方の端部を蓋するように設けられる。本実施の形態における給電用口金30は、図2に示すように、ポリブチレンテレフタレート(PBT)等の合成樹脂からなる給電用口金本体31と、真ちゅう等の金属材料からなる一対の給電ピン32とからなる。
アース用口金40は、金属製の第2基台54とアース接続されており、ランプ内に生じる異常電流を、 照明器具を介してグランドに流す。アース用口金40は、略有底円筒形状に構成されており、筐体20の他方の端部を蓋するように設けられる。本実施の形態におけるアース用口金40は、図2に示すように、PBT等の合成樹脂からなるアース用口金本体41と、真ちゅう等の金属材料からなる1本のアースピン42とからなる。
第1基台50及び第2基台54は、いずれも金属製であり、LEDモジュール10で発生する熱を放熱するヒートシンクとして機能するとともに、LEDモジュール10を載置及び固定するための基台として機能する。
コネクタ60は、隣り合うLEDモジュール10同士を電気的に接続する導電線であり、LEDモジュール10の電極端子14に装着される装着部(コネクタ部)61と、電極端子14を介してLEDモジュール10に供給する電力を通すための電力供給線62とを有する。
図2に示すように、反射部材70は、ランプの光取り出し効率を向上させるために、LEDモジュール10が発する光を一定の方向に反射するように構成されている。反射部材70は、電気絶縁性及び光反射性を有する材料によって構成されており、例えば、二軸延伸ポリエステル(PET)フィルム等からなる絶縁反射シートを加工することによって構成することができる。
図3Aに示すように、第1基台50の底部には形成された開口には、取り付け部材80が取り付けられている。取り付け部材80は、第1基台50が第1基台50の長手方向に対して可動するように第1基台50に取り付けられている。
点灯回路90は、LEDモジュール10におけるLED12の点灯状態を制御するためのLED点灯回路(LED制御回路)であって、入力された交流電力を直流電力に変換して出力する回路、又は別に設置されたLED点灯用電源からの直流電力を、正及び負の向きを適切な向きに整える機能を有する回路を備える。図2に示すように、本実施の形態において、点灯回路90は、回路基板90aと、回路基板90aに実装された複数の回路素子からなる回路素子群90bとを備える。
2 照明装置
10、10A LEDモジュール
11 基板
11a 第1面
11b 第2面
12 LED
13 封止部材
14 電極端子
15A LED素子
16A パッケージ
20 筐体
30 給電用口金
31 給電用口金本体
31a 第1給電用口金本体部
31b 第2給電用口金本体部
32 給電ピン
40 アース用口金
41 アース用口金本体
41a 第1アース用口金本体部
41b 第2アース用口金本体部
42 アースピン
43 接続部材
50 第1基台
51 第1壁部
51a 第1突出部
52 第2壁部
52a 第2突出部
53 付勢部
54 第2基台
60 コネクタ
61 装着部
62 電力供給線
70 反射部材
80 取り付け部材
81 掛合片
82 凹部
83 接着剤
90 点灯回路
90a 回路基板
90b 回路素子群
90c 入力ソケット
90d 出力ソケット
91 点灯回路カバー
100 照明器具
110 ソケット
120 器具本体
Claims (17)
- 光拡散部を有する長尺状の筐体と、
前記筐体の長尺方向に沿って前記筐体内に配置された複数の発光素子と、を備えたランプであって、
前記複数の発光素子の各々の光が前記ランプの最外郭を透過したときに得られる輝度分布の半値幅をy(mm)とし、隣り合う前記発光素子の発光中心間隔をx(mm)とすると、
y≧1.09xの関係を満たす、
ランプ。 - さらに、y≧1.21xである、
請求項1に記載のランプ。 - さらに、y≦1.49xである、
請求項2に記載のランプ。 - さらに、y>1.49xである、
請求項2に記載のランプ。 - さらに、x≧8である、
請求項2に記載のランプ。 - さらに、x<8である、
請求項2に記載のランプ。 - さらに、x≧8である、
請求項3に記載のランプ。 - さらに、x<8である、
請求項3に記載のランプ。 - 前記光拡散部は、前記筐体の内面又は外面に形成されている、
請求項1~8のいずれか1項に記載のランプ。 - 前記光拡散部は、光拡散シート又は光拡散膜である、
請求項9に記載のランプ。 - 前記光拡散部は、前記筐体の内部又は外部に設けられたレンズ構造物である、
請求項1~8のいずれか1項に記載のランプ。 - 前記光拡散部は、前記筐体に形成された凹部又は凸部である、
請求項1~8のいずれか1項に記載のランプ。 - さらに、前記筐体内に配置された長尺状の基板を備え、
前記複数の発光素子の各々は、前記基板に実装されている、
請求項1~12のいずれか1項に記載のランプ。 - さらに、
前記筐体内に配置された長尺状の基台と、
前記基台の上に実装された複数の容器とを備え、
前記複数の発光素子の各々は、前記複数の容器の各々に実装されている、
請求項1~12のいずれか1項に記載のランプ。 - 前記筐体は、ガラスからなる直管である、
請求項1~14のいずれか1項に記載のランプ。 - 前記筐体は、ポリカーボネートからなる直管である、
請求項1~14のいずれか1項に記載のランプ。 - 請求項1~16のいずれか1項に記載のランプを備える、
照明装置。
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JP2015191697A (ja) * | 2014-03-27 | 2015-11-02 | 三菱電機株式会社 | 照明ランプ及び照明装置 |
CN109812771A (zh) * | 2019-04-09 | 2019-05-28 | 华域视觉科技(上海)有限公司 | 一种车灯 |
JP2022019555A (ja) * | 2020-07-17 | 2022-01-27 | エクセレンス オプトエレクトロニクス インコーポレイテッド | 面光源型ledデバイス |
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JP2007073194A (ja) * | 2005-09-02 | 2007-03-22 | Mitsubishi Electric Corp | 直下型バックライト装置および薄型表示装置 |
JP2011248052A (ja) * | 2010-05-26 | 2011-12-08 | Mitsubishi Gas Chemical Co Inc | 光拡散シートおよびそれを用いたled光源の照明装置 |
JP2012015527A (ja) * | 2010-07-05 | 2012-01-19 | Lg Innotek Co Ltd | 発光素子モジュール |
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JP2015191697A (ja) * | 2014-03-27 | 2015-11-02 | 三菱電機株式会社 | 照明ランプ及び照明装置 |
CN109812771A (zh) * | 2019-04-09 | 2019-05-28 | 华域视觉科技(上海)有限公司 | 一种车灯 |
JP2022019555A (ja) * | 2020-07-17 | 2022-01-27 | エクセレンス オプトエレクトロニクス インコーポレイテッド | 面光源型ledデバイス |
JP7341186B2 (ja) | 2020-07-17 | 2023-09-08 | エクセレンス オプトエレクトロニクス インコーポレイテッド | 面光源型ledデバイス |
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