JP6609426B2 - Lighting device - Google Patents

Description

  The present invention relates to an illumination device including an illumination filter cover having a function of cutting blue light emitted from a light source such as a white light emitting diode (hereinafter abbreviated as a white LED element).

  Conventionally, many illuminating devices using a white LED element with low power consumption and long life have been proposed. In the illumination device using this white LED element, it is known from research that the maximum wavelength that impairs human eyes is a light beam having a wavelength of about 480 nm or less. In particular, the blue light reaching the retina is easily scattered and thus causes blurring of the image and eye fatigue.

  Specifically, blue light, which is blue light emission in the wavelength range of 360 to 495 nm, included in the light source of the white LED element causes a deterioration in the function of the retina of the human eye and adversely affects the rhythm of the body clock. In particular, ipRGC, the third photoreceptor cell, is stimulated by blue light, and a signal is transmitted to the suprachiasmatic nucleus, thereby causing circadian rhythms (endogenous endogenous cycle of about 24 hours as seen in animal and plant movements and physiological phenomena). Rhythm) is determined.

  By the way, nighttime blue light extremely disturbs the rhythm of a person's body clock, causing sleep disturbance, depression, high blood pressure, diabetes, obesity and the like. As described above, the light source of the white LED element including the wavelength range of blue light is good for daytime illumination, but is not suitable for nighttime illumination.

  Further, as disclosed in, for example, Patent Document 1, as an illumination device having a function of cutting the blue light described above, a glass or plastic cylindrical support case, for example, an LED light bar or a fluorescent tube A blue light cut antibacterial deodorant that encloses a light source and cuts a part of light having a wavelength of 480 nm or less on the light emitting surface of the support case and converts the cut energy into an antibacterial deodorant effect by a photocatalytic method. There is one that consists of coating layers.

Utility Model Registration No. 3189850

  However, in the case of Patent Document 1 described above, only the blue light of the light source by the white LED element can be efficiently reduced, but it is impossible to control the whiteness from the light source by the white LED element. In the future, there was an urgent need to develop a new lighting device that was time-free and had a balanced wavelength.

  Therefore, the present invention was created in view of the conventional circumstances as described above. Blue light of a light source using a white LED element, for example, blue light emission in a wavelength range of 360 to 495 nm, for example, only 40% to 50%. The degree of whiteness from the light source can be reduced by applying diffraction slit technology so that the dangerous wavelength range of 430 to 440 nm can be made substantially zero and the color of the light from the light source appears to be a color closer to white than yellow. It is an object of the present invention to provide an illuminating device including an illuminating filter cover that enables illumination such as natural light that is gentle to the eyes and adjusts the rhythm of the biological clock.

In order to solve the above-described problem, in the present invention, a light source configured by an LED substrate formed by arranging a plurality of white LED elements, and a wavelength 360 emitted from the light source by covering the light source. An illumination filter cover formed into a rectangular plate shape by a high refractive index material made of acrylic resin or polycarbonate resin for reducing a blue light emitting component of ˜495 nm, and the illumination filter cover has a parallel slit shape A diffraction slit group is formed by arranging a plurality of openings at equal intervals, and the whiteness from the light source should be controlled by the slit aperture ratio of the openings , and the light source is passed through the illumination filter cover. In the skirt shape attached to the periphery of the LED substrate so as to reflect the emitted light toward the outer periphery, Characterized in that it comprises a plate.

  A skirt-like reflecting plate attached to the periphery of the LED substrate is included so as to reflect light emitted from the light source through the illumination filter cover toward the outer periphery.

  According to the present invention, blue light of a light source by a white LED element, for example, blue light emission in a wavelength range of 360 to 495 nm can be reduced by, for example, 40% to 50%, and a dangerous wavelength region of a wavelength of 430 to 440 nm is made substantially zero. At the same time, it is possible to control the whiteness from the light source by applying diffraction slit technology so that the color of the light from the light source appears to be closer to white than yellow, natural light that is gentle on the eyes and adjusts the rhythm of the biological clock Enables such lighting.

  That is, in the present invention, a diffraction slit group formed by arranging a large number of parallel slit-shaped openings is formed, so that the relative radiation intensity in the maximum peak region (wavelength 452 nm) of the light source is at least 40. % Can be cut, and the state of natural light in which the color of the light from the light source appears to be a color closer to white than yellow can be reliably realized.

  For example, the blue light-cut coating applied to eyeglasses and the like reduces not only blue light having a wavelength of 470 nm or less, but also other yellow and red light having a long wavelength, and has a high cut rate. The light amount that reaches the eye decreases as the object increases, and in the case of an illumination device using a white LED element, the light becomes darker, which means that the tip falls. Also, with conventional lighting devices, the light spreads (it illuminates not the desk, but also the walls, etc.) and the desk top is not illuminated effectively. To illuminate the desk brightly, the power consumption is increased and the illuminance is secured. There must be. On the other hand, in this invention, only the place to illuminate can be efficiently brightened by forming many opening parts of parallel slit shape.

  Moreover, the problem of the directionality of light will arise if it does not coat. For example, when a coated flat glass is put on a white LED element, yellow light is strong just under the white LED element, and white light is oblique. In contrast, by forming a large number of parallel slit-shaped openings as in the present invention, the color of light in all irradiation directions appears to be a color closer to white than yellow.

  Since the light source includes a reflector skirted at the periphery of the LED substrate so as to reflect the light emitted from the light source through the illumination filter cover toward the outer periphery, for example, embedded in the ceiling In the illumination device according to the formula, all the light from the plurality of white LED elements on the LED substrate can be efficiently reflected and irradiated to the outside periphery (periphery below the ceiling) through the illumination filter cover.

It is a disassembled perspective view which shows the outline | summary of the illuminating device in one form for implementing this invention. The outline of the illuminating device which attached the filter cover for illumination similarly is shown, (a) is a top view, (b) is XX sectional drawing of Fig.2 (a), (c) is Fig.2 (a). It is YY sectional drawing. It is explanatory drawing which shows the comparative example of the blue light cut rate of a white LED element. It is explanatory drawing which shows a blue light cut filter characteristic.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[Whole structure of lighting device]
The apparatus main body P constituting the lighting apparatus according to the present invention is formed in a substantially rectangular casing shape attached to the indoor ceiling surface with the opening side facing downward, as shown in FIGS. 1 and 2. , A light source 3 constituted by an LED substrate 1 having a plurality of white LED elements 2 called citrine LEDs (registered trademark), and a wavelength of 360 to 495 nm covering the light source (LED substrate 1 + white LED element 2) 3 Covering the opening side of the device main body P with the illumination filter cover 4 made of, for example, an acrylic plate or a polycarbonate plate having a high refractive index that reduces the blue light emission in the range, the rectangular cylindrical reflector 6 arranged around the LED substrate 1 It is generally composed of a surface globe 9 provided.

  In this embodiment, the illumination filter cover 4, the light source (LED substrate 1 + white LED element 2) 3, and the reflection plate 6 are installed in the apparatus main body P as a pair of left and right. Of course, the installation configuration does not restrict the present invention.

[Configuration of light source]
As a specific configuration of the light source 3, as shown in FIGS. 1 and 2, for example, a total of 16 citrine LEDs (registered) are formed on a rectangular plate-shaped LED substrate 1 made of aluminum or glass / epoxy resin, for example. The chip-shaped white LED elements 2 called “trademarks” are mounted in two rows of 8 each, and in order to reduce the influence of voltage fluctuation (reverse voltage), a current limiting resistor (not shown) and a constant current element (constant current) are mounted. A current diode, a reverse connection diode, a constant current IC, or the like) is inserted in series with the white LED element 2.

[Configuration of filter cover for lighting]
As shown in FIGS. 1 and 2, the illumination filter cover 4 is formed into a rectangular plate shape by a high refractive index material made of, for example, acrylic resin or polycarbonate resin, and the wavelength emitted from the white LED element 2 Blue light emission component having a wavelength of about 450 nm or less at 470 nm or less is reduced.

  Incidentally, the acrylic resin is an acrylic ester or methacrylic ester polymer, and is an amorphous synthetic resin with high transparency. In particular, a transparent solid material made of polymethyl methacrylate resin is also called acrylic glass, and is also called organic glass together with the polycarbonate resin and the like.

  The illumination filter cover 4 is formed with a diffraction slit group formed by arranging a plurality of parallel slit-shaped openings 5 at equal intervals. In particular, in the case of Fraunhofer diffraction by a single slit, these openings are formed. The whiteness from the light source 3 can be controlled by the slit aperture ratio of the unit 5. That is, by providing a plurality of parallel slit-shaped openings 5 in the illumination filter cover 4, it is possible to cut blue light by about 40%, and the color of light from the light source is closer to white than yellow. The visible state can be easily realized.

[Structure of reflector]
As shown in FIGS. 1 and 2, the light emitted from the white LED element 2 is directed inside the apparatus main body P toward the inner surface side of the surface globe 9 described later via the illumination filter cover 4. A rectangular tube-like reflecting plate 6 that is widened in a skirt shape from the periphery of the LED substrate 1 to the outside is attached so as to be reflected. The reflecting plate 6 is made of, for example, aluminum and is a specular plate whose surface is coated with high-purity titanium and silicon and has a reflectance of 90% or more, and efficiently emits light emitted from the white LED element 2. The light is reflected and irradiated to the outside through a large number of openings 5 (diffraction slit group) of the illumination filter cover 4.

  In the illustrated case, the illumination filter cover 4 is molded into a shape that can be easily attached to the reflection plate 6 of the apparatus main body P, so that the attachment is facilitated. Specifically, on the both ends in the width direction of the filter cover for illumination 4, locking projections 7 having rectangular projections that are horizontally horizontal are projected at, for example, three locations in the longitudinal direction, and correspond to the locking pieces 7. A horizontally elongated hole-like locked portion 8 for inserting and locking the locking change 7 is formed on the left and right symmetrical inner wall portion of the reflection plate 6 on the inner side of the cylinder.

  Although not shown in the drawings, a special slit opening width adjustment mechanism, for example, a slide opening / closing type, is provided to enable manual or automatic variable control of the slit opening ratio of the opening 5 of the illumination filter cover 4. A shutter or the like may be provided.

[Configuration of surface globe]
As shown in FIGS. 1 and 2, a surface glove 9 made of, for example, acrylic or polycarbonate is covered on the opening side of the apparatus main body P. For example, the surface globe 9 is formed in a substantially rectangular plate shape that covers the entire opening side of the apparatus main body P, and a substantially L-shaped hook claw piece 9A is formed at the edge facing position. When the surface glove 9 is attached to the opening side of the apparatus main body P, the hook claw piece 9A is formed by the push claw piece (not shown) formed on the inner surface of the apparatus main body P. 9A is suspended and held by one touch.

  In the above-described embodiment, the arrangement form and circuit configuration of the white LED elements 2 on the LED substrate 1, the material of the LED substrate 1, the arrangement of the openings 5 (diffraction slit group) of the illumination filter cover 4, etc. The invention is not limited and various other modifications are possible.

  Next, based on the graph shown in FIG. 3 in which the horizontal axis indicates the wavelength [nm] and the vertical axis indicates the absolute radiation intensity for the spectrum comparison example of the blue light cut rate of the white LED element when the lighting device according to the present invention is used. explain. A wavelength of 380 to 500 nm indicates a blue light wavelength region.

  In FIG. 3, the curve (A) shows the wavelength spectrum of the light source 3 when the illumination filter cover 4 is not provided (horizontal axis: wavelength (nm), vertical axis: relative radiation intensity). The target light source 3 has an instrument luminous flux of 3687 [lm] (40 W), a color temperature of 5176 K, and a color rendering evaluation of 70.1. In this case, the absolute radiation intensity was about 80 at a wavelength of 440 nm in the maximum peak region.

  The curve (b) indicates the wavelength spectrum of the light source 3 when the illumination filter cover 4 and the opening 5 (diffraction slit group) are provided (horizontal axis: wavelength [nm], horizontal axis: relative radiation intensity). Indicates. The target light source 3 has an instrument luminous flux of 3580 [lm] (40 W), a color temperature of 4503 K, a color rendering evaluation of 67.2, a blue cut rate of 40% (wavelength range of 410 to 470 [nm]), and a maximum peak range. The absolute radiation intensity was about 52 at a wavelength of 450 nm.

  The curve (c) shows the wavelength spectrum of the light source 3 (horizontal axis: wavelength [nm], horizontal axis: relative radiation intensity) when the illumination filter cover 4 has no opening 5 (diffraction slit group). . The target light source 3 has an instrument luminous flux of 3564 [lm] (40 W), a color temperature of 4311 K, a color rendering evaluation of 66.5, a blue cut rate of 50% (wavelength range of 410 to 470 [nm]), and a maximum peak range. The absolute radiation intensity was about 45 at a wavelength of 452 nm.

  FIG. 4 shows an ultraviolet (UV) cut spectral transmittance curve (horizontal axis: wavelength [nm], vertical axis: transmittance [%], which is a blue light cut filter characteristic of an illumination filter cover 4 of an acrylic product of Clerax. ])It is shown. Curve (A) is part number N-169 (absorption <380 nm), curve (I) is part number N-190 (absorption <390 nm), curve (U) is part number N-113 (absorption <400 nm), and curve (e) is Part number T-130501 (1.0 t), curve (O) is N-039 (absorption <470 nm). Among these, the curve (e) is the UV filter characteristic (absorption <430 nm) by the illumination filter cover 4 of 1.0 t in this embodiment, and is 0% to about 90% in the wavelength region of 425 to 470 [nm]. The transmittance has increased to the above.

  Although the LED currently on the market looks white light at first glance, as described above, it contains blue light (blue light) that affects the eyes and internal rhythm. As described above, since blue light particularly impairs the eyes, an LED in which this blue light is cut is desired. Therefore, we developed original LED lighting that cuts blue light, and worked on the creation of an LED lighting device that is safe for human eyes. As a result, an LED illumination device that cuts about 50% of blue light could be created by employing the illumination filter cover 4 made of a synthetic resin plate such as an acrylic resin plate or a polycarbonate resin plate.

  However, when the blue light is cut, the illumination light becomes yellowish. For this reason, the illumination filter cover 4 is formed with a diffraction slit group formed by arranging a plurality of parallel slit-shaped openings 5 at equal intervals, thereby enabling about 40% of blue light cut, The light has a white taste close to sunlight (natural light).

P ... device main body 1 ... LED substrate 2 ... white LED element 3 ... light source 4 ... illumination filter cover 5 ... opening 6 ... reflector 7 ... locking piece 8 ... locked portion 9 ... surface globe 9A ... hook claw piece

Claims (1)

A light source composed of an LED substrate having a plurality of white LED elements and an acrylic resin or polycarbonate resin for covering the light source to reduce blue light emitting components having a wavelength of 360 to 495 nm emitted from the light source And an illumination filter cover formed into a rectangular plate shape with a high refractive index material made of a material, and the illumination filter cover has diffraction slit groups formed by arranging a plurality of parallel slit-shaped openings at equal intervals. The LED is formed so that the whiteness from the light source should be controlled by the slit aperture ratio of the opening , and the light emitted from the light source through the illumination filter cover is reflected toward the outside periphery. An illuminating device comprising: a reflector plate extending in the form of a skirt attached around a substrate .

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