JP2012113960A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce attraction of flying insects without damaging a color tone of irradiation light, and that, at low cost, in a lighting system using an LED light source.SOLUTION: The lighting system includes an LED part with an LED element having a peak wavelength at blue-color light and a phosphor converting a wavelength of the blue-color light to emit white color light. The phosphor is a wavelength conversion element, and that, makes up an optical member controlling wavelengths of light from the LED element 41. By dint of the wavelength control, an emission spectrum of light emitted from the LED part has a bottom wavelength at a wavelength band of 460 to 520 nm, and has characteristics that emission intensity of the bottom wavelength is greatly reduced to less than a tenth as compared with a peak wavelength of the blue-color light. With this arrangement, the wavelength band of 460 to 520 nm with little contribution to white color included in a visible light region attracting insects can be reduced, so that a color tone of white-color irradiation light is not damaged, and yet, attraction of flying insects can be reduced at low cost without adding LEDs.

Description

  The present invention relates to an illumination device using an LED light source that hardly attracts insects.

  In general, it is known that many insects and the like have running properties toward short-wavelength light, and ultraviolet rays have an attraction peak. If the short-wavelength light as described above is included in the irradiation light from the light source of the illuminating device, the illuminating device is turned on when the surroundings are dark and the like, thereby attracting insects. Such a relationship between the light from the light source and the attractiveness of insects is shown, for example, in the correlation data between the cut wavelength and the attractiveness ratio shown in FIG. 14 (see Matsushita Electric Engineering Technical Report Vol. 53 No. 1). According to this correlation data, the attracting ratio at which insects are attracted by the irradiation light varies depending on the cut wavelength of the light source (here, a fluorescent lamp), decreases with longer wavelengths, particularly decreases rapidly to 410 nm, and approximately 600 nm. Nearly zero in the vicinity. For this reason, the reduction of insect attraction by light is usually performed by cutting a short wavelength region including ultraviolet rays, for example, up to 380 nm (case 1), up to 450 nm (case 2), and up to 600 nm (case 3). ) Which cuts each wavelength.

  In case 1, the attractiveness of insects is reduced, but light that attracts insects also exists in the visible light region, so that the low attractiveness performance is insufficient. In case 2, the insect attractability is improved. However, since the light is cut to around 450 nm in the visible light region, the illumination light looks yellow, which is not preferable for general illumination. Furthermore, in the case of case 3, the insects are almost completely removed, but the irradiation light looks red, which is very uncomfortable when a person is working compared to white light such as ordinary sunlight. There is a possibility that it may feel or work capacity may be lowered, and it is not suitable for general lighting.

  By the way, an LED having a light emission peak in the visible light region can be wavelength-controlled so as to emit almost no ultraviolet light unlike a fluorescent lamp or the like, and an illuminating device using such an LED as a light source has little insect attraction. However, even in this type of lighting device, light that attracts insects is present in the visible light region generated by the LED, so it cannot be said that the low attraction performance is sufficient.

  By adding light from a second LED element having a peak wavelength of 500 nm or more to light from a white LED using a blue light first LED and a yellow phosphor as this type of illumination device, Those that reduce the attractiveness of insects are known (see, for example, Patent Document 1).

JP 2009-224148 A

  In this type of lighting device, when the second LED element is 500 nm or more and has a peak wavelength in red light, insects are said to be unable to see red because of their visual characteristics. There is no. In addition, when the second LED element has yellow light as the peak wavelength, yellow light has traditionally been said to be effective in suppressing the behavior of nocturnal moths, but other insect repellent effects have been confirmed. It has not been. Therefore, it is difficult to reduce the attraction of insects, for example, the repellent effect is limited to nocturnal moths. Further, since it is necessary to add LEDs having different peak wavelengths, the power consumption increases, the configuration becomes complicated, and the cost increases.

  The present invention has been made in order to solve the above-described problem, and in an illumination device using an LED light source, it is possible to reduce the attractiveness of flying insects without impairing the color tone of irradiated light. An object is to provide an illumination device at low cost.

  In order to achieve the above object, the illumination device of the present invention includes an LED that emits light having a peak wavelength in the visible light region, and the spectrum of the emitted light has a light emission intensity of one-tenth or less of the peak wavelength. The bottom wavelength is in the wavelength range of 460 to 520 nm.

  In this lighting device, the LED preferably has a peak wavelength in a wavelength band of 400 to 450 nm.

  In this illuminating device, it is preferable that the spectral spectrum has a bottom wavelength in which the emission intensity is substantially zero in a wavelength band of 460 to 520 nm.

  In this illuminating device, it is preferable that the spectral spectrum has substantially zero emission intensity in a wavelength band of 390 nm or less.

  According to the illumination device of the present invention, the visible light that attracts insects is reduced in the wavelength range of 460 to 520 nm, which has a relatively small contribution to white light. The attractiveness of flying insects can be reduced at low cost without adding.

The block diagram of the illuminating device which concerns on the 1st Embodiment of this invention. The front view of an illuminating device same as the above. (A) is a perspective view of the light source part in an illuminating device same as the above, (b) is a cross-sectional block diagram of the LED part in the light source part. The spectral spectrum figure of the irradiation light from an illuminating device same as the above. Sectional drawing of the LED part of the illuminating device which concerns on the 2nd Embodiment of this invention. The enlarged view of the A section of FIG. The light transmission characteristic figure of the outline of the wavelength cut filter (band stop type) in the light source part of the illumination device same as the above. The spectral spectrum figure of the irradiation light from an illuminating device same as the above. (A) is sectional drawing of the light emission part of the illuminating device which concerns on the 3rd Embodiment of this invention, (b) is an enlarged view of the B section in (a). The schematic light transmission characteristic figure of the wavelength cut filter in the light source part of an illuminating device same as the above. (A) is a schematic light transmission characteristic figure of the wavelength cut filter used for Example 3, (b) is sectional drawing of the same filter. (A) is a schematic light transmission characteristic figure of the wavelength cut filter used for Example 4, (b) is sectional drawing of the filter. (A) is sectional drawing of the light source part of the illuminating device used for Example 6, (b) is an enlarged view of the C section in (a), (c) is a rough light transmission characteristic of the wavelength cut filter of the light source part. Figure. The figure which shows the correlation with the cut wavelength of the light source in the conventional illuminating device, and the insect attracting ratio.

(First embodiment)
A lighting device according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the illuminating device 1 includes a rectangular housing 2 having an opening on one surface and a light source unit 3 housed in the housing 2. The light source unit 3 includes an LED element and an optical member (described later in detail) that controls the wavelength of light emitted from the element, and includes an LED unit 4 that emits light in the visible light region, and faces the opening 21. It is attached to the bottom surface in the housing 2 to be operated. The illumination device 1 according to the present embodiment has a bottom wavelength in a wavelength range of 460 to 520 nm, in which the spectrum of the emitted light has an emission intensity that is one tenth or less of the peak wavelength. In addition, the illuminating device 1 is used as a lighting fixture directly attached to a ceiling surface, for example, or as a downlight embedded in a ceiling wall surface by an attachment jig (not shown). The peak wavelength here means the maximum peak wavelength in the spectrum.

  As shown to Fig.3 (a), the light source part 3 is provided with the board | substrate 31 with which several LED part 4 is arrange | positioned. The substrate 31 is a printed circuit board, a ceramic substrate, or the like, and the shape is not limited to the illustrated circle but may be a polygon. Further, the arrangement of the LED unit 4 is not limited to the central part of the substrate 31 or the like.

  As shown in FIG. 3B, the LED unit 4 is mounted on the substrate 31 and emits light having a peak wavelength in the visible light region, and a sealing unit 42 made of a transparent member covering the LED element 41. The phosphor 5 for converting the wavelength of light from the LED element 41 is provided in the sealing portion 42. The phosphor 5 is a wavelength conversion element and constitutes an optical member that controls the wavelength of light from the LED element 41. The LED unit 4 emits white light by the light from the LED element 41 and the light from which the light from the LED element 41 is wavelength-converted by the phosphor 5, and the spectral spectrum of the irradiation light is in the emission wavelength region. It has a bottom wavelength at which the emission intensity is one-tenth or less of the peak wavelength.

  The LED element 41 uses a GaN-based blue LED chip that emits blue light (for example, a product made by Toyoda Gosei, Mitsubishi Chemical, etc.), and its material is limited as long as it shows a target blue peak wavelength. Not. Here, the LED element 41 has a peak wavelength in the wavelength band of 400 to 450 nm, and excites the phosphor 5 with high efficiency. The LED element 41 is supplied with power through a wiring pattern on the substrate 2 by a power supply circuit (not shown) formed on the substrate 31.

  The sealing portion 42 uses a transparent silicone resin as a member and forms a cap shape to cover the LED element 41. The sealing portion 42 is not limited to silicone resin, and acrylic resin (PMMA) or the like may be used. The shape of the sealing portion 42 is not limited to a cap type, and has a condensing lens function such as a bullet shape or a hemispherical shape. It may be allowed.

  As the phosphor 5, among the materials of the color conversion member, yttrium / aluminum / garnet phosphor (YAG) which is particularly excellent in terms of luminous efficiency, silicate phosphor, or the like can be used. The phosphor 5 is dispersed and held in the transparent resin of the sealing portion 42. For example, a part of blue light from the LED element 41 is absorbed and wavelength-converted to emit yellow light. The yellow light and the phosphor 5 White light is formed by the remaining blue light that has not been absorbed in. The LED element 41 and the sealing portion 42 including the phosphor 5 form a white LED that emits white light.

  Here, the phosphor 5 is combined with the LED element 41, and the selection of the fluorescent material, the setting of the compounding ratio to the silicon resin, and the like so that the emission spectrum of the output light has the target peak wavelength and the bottom wavelength, It is formed by mixing phosphors. The phosphor 5 is not limited as long as the emission wavelength can be controlled.

  When the light emitted from the LED element 41 is converted in wavelength by the phosphor 5 and emits light, the emission spectrum has a light emission intensity in the wavelength band of 460 to 520 nm, which is not more than one-tenth of the peak wavelength. It is formed to have a bottom wavelength.

  Further, the LED element 41 has a peak wavelength in the wavelength band of 400 to 450 nm, but if the peak wavelength is located on the short wavelength side within the wavelength band, the luminous efficiency of the phosphor 5 is further increased. At this time, if the peak wavelength is too close to the short wavelength side, the LED element 41 emits light of 390 nm or less due to the wavelength broadening of the LED emission, so that there is a peak wavelength in the vicinity of 410 to 420 nm to avoid this. It is desirable.

  FIG. 4 shows a relative spectral spectrum of light emitted from the LED unit 4. This spectral spectrum has a maximum peak wavelength in a wavelength band of approximately 440 to 450 nm, and is normalized by setting the emission intensity of this peak wavelength to a relative value of 1, and is relative to the peak wavelength in the wavelength band of 460 to 520 nm. It has a bottom wavelength with a light emission intensity of 0.1 or less.

  According to the present embodiment, the visible light from the LED unit 4 has a bottom wavelength in the wavelength band of 460 to 520 nm, and the emission intensity of the bottom wavelength is greatly reduced to one or less than the peak wavelength. At this time, since the bottom wavelength is between blue light (near 400 to 450 nm) and yellow light (for example, near 560 nm to 600 nm), there is little influence on the emission intensity of blue light and yellow light, and due to these lights. The color tone of white light can be hardly changed. In addition, by reducing the emission intensity of the bottom wavelength at 460 to 520 nm, part of the light in the visible light region that attracts insects can be suppressed, so that the attractability of flying insects can be reduced. Moreover, since it is not necessary to add the LED element which has a peak wavelength other than blue light to the LED part 4, it can be made low-cost by simple structure. Further, since there is almost no decrease in the emission intensity of blue light accompanying the decrease in the emission intensity at the bottom wavelength, the conversion efficiency in the phosphor 5 is maintained, and the decrease in efficiency is suppressed.

  In addition, since the LED unit 4 has a peak wavelength of 400 to 450 nm and a bottom wavelength of 460 to 520 nm, the emission spectrum sharply decreases from the peak wavelength to the bottom wavelength, so that the white color is clean. appear. In addition, this embodiment can be used for all the illuminating devices which use a LED light source.

(Second Embodiment)
An illumination device according to a second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 5, in the present embodiment, the light source unit 3 includes a wavelength cut filter 6 for blocking transmission of light having a predetermined wavelength on the surface side of the sealing unit 42 of the LED unit 4. It is a thing. The wavelength cut filter 6 constitutes an optical member that controls the wavelength of light from the LED. In the present embodiment, the LED unit 4 has a spectrum having a bottom wavelength in which the emission intensity is substantially zero in the wavelength band of 460 to 520 nm when the light from the LED element 41 passes through the wavelength cut filter 6. . The wavelength cut filter 6 may be provided in the light emitting direction of the LED unit 4 and may not be packaged together with the LED unit 4. The wavelength cut filter 6 may be formed as a cover member that covers a plurality of LED portions with one member. In addition, in order to assist the characteristic of the wavelength cut filter 6, the phosphor 5 may have the same light transmission characteristic as that of the above embodiment.

  Here, the LED section 4 has a rectangular concave frame 43 that houses the LED element 41, the frame 43 has the LED element 41 mounted on the bottom surface thereof, and the inside holds the phosphor 5 and holds the LED element. The sealing portion 42 that seals 41 is filled with a transparent resin. Further, the frame 43 is covered with a flat front filter 7 made of a transparent member on the light emitting surface side. The front filter 7 is made of a transparent member made of resin or glass. Here, the glass member is used to transmit light emitted from the sealing portion 42 as it is. A wavelength cut filter 6 is disposed on the front filter 7.

  As shown in FIG. 6, the wavelength cut filter 6 is an optical film composed of a dielectric thin film in which titanium oxide and silicon oxide are sequentially laminated on a glass substrate of the front filter 7 to form an eight-layer film. It has a multilayer film. The wavelength cut filter 6 is formed by the optical multilayer film as an optical filter having a predetermined wavelength cut characteristic. Specifically, in this optical multilayer film, titanium oxide having a film thickness of 400 nm and silicon oxide having a film thickness of 246 nm are alternately laminated on glass up to seven layers, and silicon oxide having a film thickness of 100 nm is formed thereon as the uppermost layer. It is composed of layers.

  The characteristics of the wavelength cut filter 6 are formed by utilizing the fact that the light transmission characteristics change due to interference between reflections generated at the interfaces between different dielectrics in the optical multilayer film. The composition, film thickness, and layer structure of the dielectric thin film in the optical multilayer film are designed by, for example, simulation using thin film design software based on the target filter characteristics, and the dielectric thin film is created by electron beam evaporation or the like. Is done. Further, the filter material is not limited as long as the wavelength can be controlled.

  The wavelength cut filter 6 has a light transmission characteristic that allows light from the LED unit 4 that has passed through the wavelength cut filter 6 to have substantially zero light emission intensity in at least one place in the wavelength range of 460 to 520 nm. It is formed. In addition, it is desirable for this light transmission characteristic that the wavelength of 490 nm vicinity is substantially zero. In the case where the color tone is not affected, the wavelength range of 460 to 520 nm may be all zero.

  FIG. 7 shows a schematic transmission characteristic of light passing through the wavelength cut filter 6. This light transmission characteristic has a substantially zero bottom wavelength in the wavelength range of 460 to 520 nm, and forms a band blocking type that blocks transmission in this band. FIG. 8 shows a spectral spectrum of light transmitted from the LED unit 4 through the wavelength cut filter 6 having the above light transmission characteristics. Here, the spectral spectrum is sharply reduced within the wavelength band of about 460 to 520 nm, and the emission intensity is almost zero in a part of these wavelength bands.

  According to the present embodiment, the light from the LED unit 4 has a bottom wavelength at which the emission intensity at least at one place in the 460 to 520 nm wavelength band is substantially zero, so that the emission intensity in that wavelength band is further suppressed. Thus, the attractiveness of flying insects can be further reduced.

(Third embodiment)
An illumination device according to a third embodiment of the present invention will be described with reference to FIG. As shown in FIGS. 9A and 9B, in the present embodiment, in the light source unit 3 of the above-described embodiment, a short wavelength of 390 nm or less is used instead of the band rejection type wavelength cut filter on the front side of the LED unit 4. A high-frequency blocking type wavelength cut filter 8 (optical member) that blocks the band (high frequency) side is provided. In the present embodiment, when the light from the LED unit 4 passes through the wavelength cut filter 8, the emission intensity in the wavelength band of 390 nm or less becomes substantially zero in the spectrum of the emitted light.

  The wavelength cut filter 8 uses a transparent member such as acrylic (PMMA), polycarbonate resin, or glass. Here, in the wavelength cut filter 8, the front filter 7 of the LED unit 4 is formed of an acrylic resin, and at least an ultraviolet absorber (for example, manufactured by Ciba Co., Ltd .: Tinuvin 326, etc.), additives such as dyes and pigments, etc. 9 is added. The wavelength cut filter 8 controls the transmission wavelength so as to cut the short wavelength band side of 390 nm or less by this addition. As the additive 9, it is desirable to use an ultraviolet absorber in view of durability and color tone.

  The wavelength cut filter 8 can also be formed by laminating an optical multilayer film on resin or glass and cutting the wavelength of 390 nm or less by optical filter design, as described above. The wavelength cut filter 8 may be integrated with the phosphor 5. Further, the wavelength cut filter 8 uses a glass material as its member, and a halide or the like is added to the glass material, and the translucent glass made of borosilicate or phosphoric acid having the above-described wavelength cut light transmission characteristics. May be formed. Further, by controlling the composition of the LED element, the LED unit 4 itself may be configured not to emit light at 390 nm or less. In addition, when there is a blue wavelength peak on the short wavelength side, not only 390 nm light is emitted, but also a lot of light in the vicinity of 400 to 420 nm is emitted. It is desirable to make it 50% or less compared to the strength. Further, the material and method are not limited as long as the wavelength can be controlled.

  According to this embodiment, the short wavelength band side of 390 nm or less of the irradiation light from the light source part 3 is cut, whereby the emission spectrum in the ultraviolet region is reduced and the attracting ability of flying insects is further reduced. Further, when the wavelength cut filter 8 is formed by adding the additive 9 to the acrylic resin, the optical multilayer film is not used, so that it can be manufactured at a low cost.

  Next, Examples 1 to 6 according to the above-described embodiment will be described in comparison with Comparative Examples 1 and 2 (not an embodiment). As shown in FIGS. 10A and 10B, the lighting devices 1 in Examples 1 to 6 and Comparative Examples 1 and 2 are in the shape of a downlight mounted in the horizontal direction, and the light from the light source unit 3 is enclosed. It attached to the pole 10 of the center part of the room so that it might irradiate from the opening 21 of the body 2 in the horizontal direction. The light source unit 3 was installed in the housing 2 so that a black panel (wooden) was provided on the light irradiation surface of the opening 21 of the housing 2, a hole was formed in the black panel, and irradiation was performed from the hole. The opening 21 of the housing 2 has a size of about 500 mm square, and on the upper and lower ends thereof, an insect trap adhesive trap sheet 11 having a size of width 200 × length 500 mm so as to block a part of the opening 21. Each was attached. The light from the light source unit 3 was irradiated only from the opening 21 side between the adhesive trap sheets 11. Here, the light source unit 3 uses eight LEDs. The lighting device was fixed using a Panasonic Electric Works downlight (NNN21615 shape).

(Measuring method)
The spectral spectrum from the illumination device was measured using an instantaneous multi-photometry system (MCPD3000: manufactured by Otsuka Electronics Co., Ltd.), and the zero intensity region of the bottom wavelength was measured together with the emission intensity at the peak wavelength and the bottom wavelength. The ratio of emission intensity at the bottom wavelength and the peak wavelength (referred to as B / P ratio) was calculated by calculating the intensity of the peak wavelength as 10. For example, a B / P ratio of 1.0 indicates that the emission intensity at the bottom wavelength is 1 which is a sufficient peak wavelength.

(Evaluation methods)
The insecticidal evaluation for attracting insects was performed by separating 400 insects of 3 types (fly, snapper, etc.) each in a 10 m square room, and evaluating the number of insects captured after 1 hour. Here, the total number of insects captured in Comparative Example 2 was set to 100, and this was used as a reference value for relative comparison. The evaluation results measured under the above conditions are shown in Table 1 above. Table 1 shows the examples and comparative examples in the vertical column, and the peak wavelength, the B / P ratio, the zero wavelength region of the bottom wavelength, the presence or absence of a cut filter of a short wavelength or less, and the insect attractant in order in the horizontal column. . The color tone is evaluated by irradiating a white plate with light from a downlight-shaped lighting device, and visually evaluating the color tone. In this visual evaluation, “white” or “no significant change in color tone (not yellowish). "In the case of"", it was marked as ◯, and in the case where the yellowish color appeared strong, it was marked as" X ".

Example 1
The illuminating device in Example 1 has the same configuration as that of the first embodiment, and a silicon resin sealing portion in which a yellow phosphor is blended is provided on an LED element that emits a blue peak wavelength. The configuration. Their emission spectra have a peak wavelength of 440 nm, a B / P ratio of 1.0, and the bottom wavelength emission intensity is one-tenth or less of the peak wavelength. The insect attractivity was 85, which was below the reference value (100), making it difficult to attract flying insects. Moreover, the color tone evaluation was favorable. In each of the following examples, except for Example 5, the peak wavelength is all 440 nm.

(Example 2)
The illumination device in Example 1 has the same configuration as that of the first embodiment, and is sealed with a silicone resin in which two types of yellow phosphors are blended on an LED element that emits a blue peak wavelength. It was set as the structure which provides a part. As a result, the B / P ratio was 0.5, and the insect attractivity was further reduced to 75.

(Example 3)
As the illumination device in Example 3, in the second embodiment, a wavelength cut filter having a light transmission characteristic of substantially zero at 485 to 490 nm as shown in FIG. As shown in FIG. 11B, the wavelength cut filter was configured to form an optical multilayer film composed of eight layers on a weather-resistant transparent acrylic resin to obtain the above-described light transmission characteristics. As a result, the B / P ratio was 0.1 or less, and the insect attractivity was further lowered.

Example 4
In Example 4, as shown in FIG. 12A, the wavelength cut filter is 475 to 495 nm, and the light transmission characteristic becomes substantially zero in Example 3. As shown in FIG. 12B, the wavelength cut filter was configured to form the optical multilayer film consisting of 20 layers on a weather-resistant transparent acrylic resin so as to obtain the above light transmission characteristics. As a result, the B / P ratio was 0.1 or less, the insecticidal property was 65, and was the lowest among the examples.

(Example 5)
In the illumination device in Example 5, in the third embodiment, the wavelength cut filter for suppressing the short wavelength band is inserted into the acrylic resin with an ultraviolet absorber, a light stabilizer, etc., and cut to 405 nm or less (300 to 405 nm). Configured to do. Here, the peak wavelength was lowered to 410 nm. Also in this case, the insect attractivity is lower than the reference value.

(Example 6)
As shown in FIGS. 13A and 13B, the illumination device in Example 6 is a high-frequency blocking type that suppresses a short wavelength band of 390 nm or less as the wavelength cut filter 8 as shown in FIGS. The optical filter was composed of an optical multilayer film. The wavelength cut filter 8 is formed by a 14-layer optical multilayer film laminated on a front filter 7 made of a transparent acrylic resin provided on the LED unit 4. As shown in FIG. 13C, the light transmission characteristic of the wavelength cut filter 8 is sharply reduced in the vicinity of 390 nm and cuts on the short wavelength band side of 390 nm or less. Also in this case, the insect attractivity is lower than the reference value. In addition, since the wavelength cut filter 8 sharply cuts around 390 nm, the color tone (yellowishness) of the filter is particularly reduced.

(Comparative Example 1)
The illumination device of Comparative Example 1 is obtained by changing the peak wavelength of blue light to 470 nm in Example 1 and changing the blending of the phosphor into the silicon resin. As a result, the B / P ratio was 1.5, and the insect attractivity was 120, exceeding the reference value. The color tone evaluation was good.

(Comparative Example 2)
The illumination device of Comparative Example 2 is obtained by changing the peak wavelength of blue light to 455 nm and changing the blending ratio of two types of yellow phosphors mixed with silicon resin in Example 2. As a result, the B / P ratio was 1.2. In this case, the number of insects caught was defined as 100, and this was used as an evaluation standard for attracting insects.

(Comparative Example 3)
The illumination device of Comparative Example 3 is the same as that of Example 2 except that the peak wavelength of blue light is changed to 440 nm, and the mixing ratio of two types of yellow phosphors mixed with silicon resin is changed. As a result, the B / P ratio was 2.0, and the insect attractivity was 110, exceeding the reference value.

  As can be seen from the above evaluation results, in all Examples, the B / P ratio is 1.0 or less, that is, in the wavelength band of 460 to 520 nm, one tenth or less of the peak wavelength in the emission wavelength region of the LED unit 4. It has a spectrum having a bottom wavelength of the emission intensity. Thereby, the effect that insect attractivity reduces from a comparative example was acquired. In particular, in Examples 3 and 5, the B / P ratio was 0.1 or less at 485 to 490 nm and 475 to 495 nm, respectively, and the insect attractancy was reduced by 30% or more compared to Comparative Example 2 by using the substantially bottom zero region. It was possible to increase the repellent effect against insects. In addition, in the case of having wavelength cut filters of 390 nm and 405 nm or less, the insect attracting ability was lower than the reference value. The color tone evaluation was good in all cases.

  In addition, this invention is not restricted to the structure of said embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, in each of the above embodiments, the wavelength cut filter, the phosphor, and the seal portion may be integrated. Moreover, the illuminating device of each embodiment can be used not only for downlights but also for exterior illuminators such as street lamps, illuminators for base lights, etc., as long as it uses an LED light source.

1 Lighting device 4 LED unit (LED)

Claims (4)

An LED that emits light having a peak wavelength in the visible light region,
The illuminating device characterized in that the spectral spectrum of the emitted light has a bottom wavelength having a light emission intensity of one-tenth or less of the peak wavelength in a wavelength band of 460 to 520 nm.   The lighting device according to claim 1, wherein the LED has a peak wavelength in a wavelength band of 400 to 450 nm.   The illumination apparatus according to claim 1, wherein the spectral spectrum has a bottom wavelength at which the emission intensity is substantially zero in a wavelength range of 460 to 520 nm.   4. The illumination device according to claim 1, wherein the spectral spectrum has substantially zero emission intensity in a wavelength band of 390 nm or less. 5.

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