WO2009133615A1

WO2009133615A1 - Lighting apparatus using led

Info

Publication number: WO2009133615A1
Application number: PCT/JP2008/058337
Authority: WO
Inventors: 志星李
Original assignee: 株式会社グローバル・アイ
Priority date: 2008-05-01
Filing date: 2008-05-01
Publication date: 2009-11-05
Also published as: JPWO2009133615A1; CN101657675A

Abstract

An object is to provide a lighting apparatus in which an LED does not look like a point optical source and which does not provide illumination with drastically reduced light intensity even in a place away from the LED and a place angularly deviated from the radiation direction of the LED, and in which a plurality of LED structures are arranged in parallel, utilizing the features of the LED such as having no heat, low power consumption, and long life. The problem is solved by use of the lighting apparatus which has an LED group (2) having a plurality of LEDs arranged in parallel and in which an elongated first light reflection member (3) having a cylindrical lens effect is provided on at least the front surface of the LED group. Further, the problem is solved by use of the lighting apparatus in which a plurality of elongated second light reflection members (13) having the cylindrical lens effect are arranged in parallel on at least the front surface of the LED group outside the first light reflection member in such a manner that the second light reflection member is substantially orthogonal to the first light reflection member.

Description

Lighting equipment using LED

The present invention relates to a lighting fixture using LEDs, and more particularly to a lighting fixture in which a light refractor having a specific structure is provided on the front surface of a plurality of LEDs.

Many lighting fixtures using LEDs are known (for example, Patent Documents 1 to 4). In addition, in order to replace the general-purpose fluorescent lamp, it is compatible with the fluorescent lamp so that it can be used by being mounted on a general-purpose fluorescent lamp. Are also known (for example, Non-Patent Documents 1 and 2).

Although these lighting fixtures using LEDs have features such as no heat, less power consumption and longer life than fluorescent and incandescent lamps, they have many problems. For example, even if a plurality of LEDs are juxtaposed, the illuminance may not be sufficient. Even if a large number of LEDs are juxtaposed to secure the illuminance, the illuminance at a location close to the LEDs is sufficient but away from the LEDs (for example, 1 m However, the illuminance at that point drops sharply. In addition, even if the illumination intensity in the LED irradiation direction is sufficient, there is a problem that the illumination intensity drops abruptly in a place where the angle slightly deviates from the LED irradiation direction. Then, when more LEDs are juxtaposed in order to sufficiently secure the illuminance at such a place, there arises a problem that the illuminance is excessively increased in the vicinity or the entire lighting fixture becomes expensive.

Moreover, since LEDs are point light sources, even if a plurality of LEDs are juxtaposed as a lighting fixture, looking at one LED itself may be dazzling, or the aesthetics may be impaired as a lighting fixture. When used as a product, there is a problem that the appearance is greatly different from a general-purpose fluorescent lamp in which the entire lighting fixture is shining. And in order to solve these, although the method of covering the whole with frosted glass (frosted glass) is also considered, the said problem resulting from LED being a point light source was not able to be solved.

Therefore, although the lighting fixture using LED has the above-mentioned many features, it has not become a general-purpose product as a lighting fixture and cannot be used as a substitute for a general-purpose fluorescent lamp. .

Demands for energy saving, long life, good environmental characteristics, etc. have been increasing in recent years. The LED can meet such a demand, but the lighting fixture using the LED has a problem as described above, and there is room for further improvement.

JP 2002-304904 A Japanese Patent Laid-Open No. 2004-039594 JP 2006-024381 A JP 2007-227210 A

The present invention has been made in view of the above-mentioned background art, and the problem is that the LED looks like a point light source while taking advantage of the features of the LED such as having no heat, low power consumption, and long life. Therefore, the object is to provide a “lighting device having a plurality of LEDs” in which the illuminance does not drop sharply even if the LED is separated from the LED or is angularly shifted from the irradiation direction of the LED.

As a result of intensive studies to solve the above problems, the present inventor arranged a plurality of elongated first photorefractive bodies having the effect of a cylindrical lens in parallel on at least the front surface of a plurality of LEDs arranged side by side. Solved the problems and problems, completed the present invention by finding that the light emitting LED looks like a line light source or a surface light source instead of a point light source, and that the illuminance does not decrease far, and the illuminance does not decrease even in an oblique direction It came to do.

That is, the present invention has an LED group having a plurality of LEDs arranged in parallel, and a plurality of elongated first photorefractive bodies having a cylindrical lens effect are arranged in parallel on at least the front surface of the LED group. The lighting fixture characterized by becoming is provided.

In addition, the present invention provides an elongated second light having the effect of a cylindrical lens, at least in front of the LED group, outside the first light refracting body, and further substantially orthogonal to the first light refracting body. The above-mentioned lighting apparatus having a plurality of refractive bodies arranged in parallel is provided.

According to the present invention, it is efficient because it does not have heat, and since it consumes less power, it can reduce natural resources necessary for power generation, reduce CO ₂ emissions, is environmentally friendly, has a long life, etc. While demonstrating the features, it was a drawback of LEDs for lighting fixtures, that the illuminance suddenly drops when the distance from the LED is far away, and the illuminance suddenly drops when it is angularly shifted from the LED irradiation direction A lighting apparatus that solves the problem can be provided.

Also, by providing a plurality of first light refractors in parallel, the LED looks like a linear light source instead of a point light source, and glare is reduced when looking at the place where the LED is located, and illumination. The appearance as an instrument is not impaired, and the appearance can be brought close to a general-purpose fluorescent lamp that shines as a whole.

Further, by providing a plurality of second light refractors in parallel to the first light refractor, the LED that looks like a line light source can be seen as a surface light source, that is, a lighting fixture. Light is emitted from the whole, and when looking at the place where the LED that emits light is stared, glare is eliminated, the appearance as a lighting fixture is not impaired, and it looks like a general-purpose fluorescent lamp that is irradiated with light from the whole lighting fixture Can be brought closer.

Therefore, it is almost indistinguishable from general-purpose fluorescent lamps both optically and externally, and if it can be used by attaching it to a lighting fixture for general-purpose fluorescent lamps, it can be used as an alternative to general-purpose fluorescent lamps. An instrument can be provided.

It is the schematic of an example of the lighting fixture of this invention. (A) Side view (b) Plan view from the front It is a general | schematic whole perspective view of what can replace a straight tube type general purpose fluorescent lamp among the lighting fixtures of this invention. It is a top view which shows the example of juxtaposition of LED of what can substitute for a straight tube type general purpose fluorescent lamp among the lighting fixtures of this invention. It is an example of the lighting fixture of this invention, and is an expansion perspective view of what can substitute for a straight tube type general purpose fluorescent lamp. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4, and is an overall vertical cross-sectional view of an example of a lighting fixture of the present invention. It is an example of the lighting fixture of this invention, and is the schematic of what used both the 1st photorefractive body and the 2nd photorefractive body. (A) Side view (b) Plan view from the front It is an example of the lighting fixture of this invention, and is a perspective view of what can substitute for a straight tube type general purpose fluorescent lamp using both the 1st photorefractive material and the 2nd photorefractive material. FIG. 10 is a cross-sectional view taken along the line VIII-VIII in FIGS. 7 and 9 and is an example of a lighting fixture according to the present invention, and uses both a first light refracting body and a second light refracting body. It is a longitudinal cross-sectional view of what can be substituted. (A) Overall view of the longitudinal section (b) Enlarged view of the part enclosed by the square in the overall view of the longitudinal section (a) FIG. 9 is a cross-sectional view taken along arrows IX-IX in FIG. 7 and FIG. 8, which is an example of a lighting fixture according to the present invention, and uses both a first light refracting body and a second light refracting body. FIG. 6 is a cross-sectional view of an alternative. It is a figure which shows the preferable positional relationship of LED and a 1st photorefractive body, and demonstrates the effect of this invention. It is a figure which shows the place of each point which measured illumination intensity.

Explanation of symbols

1 Lighting equipment 2 LED
2 'Schematic arrow indicating the size and position of the LED 2 "Schematic arrow indicating the virtual image of the LED 3 First photorefractive body 4 First photorefractive body group 5 Inner tube 6 LED installation plate 8 Wiring space 13 Second photorefractive Body 14 Second photorefractive body group 15 Outer tube 21 Pin d1 Thickness of center portion of first photorefractive body L1 Width of first photorefractive body d2 Thickness of center portion of second photorefractive body L2 Second light refraction Body width α [180 ° − (angle at which the central LED looks at the first photorefractive body group)] / 2
F1 Substantial focal point of the first photorefractive body f1 Substantial focal length of the first photorefractive member F2 Substantial focal point of the first photorefractive member f2 Substantial focal length of the first photorefractive member M Midpoint of the luminaire P Illumination A plane at a distance of 1 m in the direction of light irradiation from the instrument

Hereinafter, the present invention will be described with reference to the drawings. However, the present invention is not limited to the specific forms shown in the drawings, and can be arbitrarily modified within the scope of the technical idea.

<Overall Description of Using First Photorefractive Material>
The luminaire 1 of the present invention has an LED group having a plurality of LEDs 2 arranged side by side, and a plurality of elongated first photorefractive bodies 3 having a cylindrical lens effect are arranged in parallel on at least the front surface of the LED group. It is characterized by having.

FIG. 1 is a side view (a) of a lighting fixture of the present invention and a front view (b) as viewed from a direction in which the LED 2 emits light (hereinafter sometimes referred to as “front surface”). In FIG. 1, a total of 18

LEDs

2, 3 vertically and 6 horizontally, are juxtaposed on the LED installation plate 6 to form an LED group. The number of LEDs forming the LED group and the density of juxtaposed LEDs are not particularly limited, and it is sufficient that they are juxtaposed at such numbers and densities that can function as a lighting fixture. The distance between the light emitting points (center portions) of the adjacent LEDs 2 is preferably 15 mm to 100 mm, more preferably 20 mm to 70 mm, and particularly preferably 25 mm to 40 mm. When the distance is too short and the density is too large, heat may be generated or power consumption may increase, and the characteristics of the LED may not be utilized. Moreover, it may become brighter than a general-purpose fluorescent lamp and may increase the cost. On the other hand, when the distance is too long and the density is too small, the lighting device may not be bright enough. Further, even if the first photorefractive body or the second photorefractive body (hereinafter, may be abbreviated as “photorefractive body” in some cases) according to the present invention, it appears as a point light source, and a line light source or surface It may not look like a light source and may not have the effect of the present invention.

In FIG. 1, LEDs 2 are juxtaposed on a flat LED installation plate 6 to form a group of LEDs to form a flat type lighting device 1. However, in the present invention, it is not necessary to juxtapose LEDs 2 on a plane, but on a curved surface. You may let them. The surface on which the LED 2 of the LED installation plate 6 is installed may be a flat surface or a curved surface as long as the effects of the present invention are achieved.

The LED 2 can be any general-purpose LED, and a commercially available product is preferably used. For example, a LED manufactured by Cree is used. When aiming at a complete replacement of a general-purpose fluorescent lamp, a white type having a color close to that of a general-purpose fluorescent lamp is preferable. Among the white systems, those having a color temperature of 4500K to 5500K are particularly preferable. A plurality of types of LEDs can also be used.

In FIG. 1, on the front surface of the LED group (upper part in FIG. 1A), a plurality of elongated first light refractors 3 having the effect of a cylindrical lens are fixedly installed in parallel over the entire surface of the LED group. The first photorefractive body group 4 has the effect of a cylindrical lens, and “the effect of the cylindrical lens” does not have a cross section having the effect of a convex lens. This refers to the effect of the cylindrical lens having a cross section.

The first photorefractive body 3, that is, the first photorefractive body group 4, “the illuminance does not decrease even if the distance from the LED or the luminaire is far away”, “the illuminance does not decrease even if it is angularly shifted from the irradiation direction of the LED. ", The LED is provided in order to obtain the effect of the present invention that it looks like a linear light source instead of a point light source. In the case of FIG. 1B, by providing the first photorefractive body group 4, all of the six LEDs 2 arranged side by side are combined to look like a linear light source. That is, in FIG. 1B, it appears that three line light sources are arranged vertically, and the above-described effects of the present invention can be obtained.

The shape of the first photorefractive body 3 is not particularly limited as long as it has the above effect, but it is essential that the first photorefractive body 3 swells as a whole toward the center line in order to have the effect of a convex lens. In FIG. 1A, the lower surface (LED-side surface) and the upper surface (front surface) of the first photorefractive body 3 are convex surfaces, but the lower surface may be concave or flat, and the upper surface (front surface) is concave. However, as shown in FIG. 2 and FIG. 3, it may be a flat surface and may have a shape like a kamaboko lens as a whole. Since the upper surface (front surface) may be the outermost surface of the lighting apparatus of the present invention, it is preferable that the upper surface (front surface) is flat as shown in FIGS. . 2 and 3, the outermost surface of the entire lighting fixture is an arc, but the upper surface (front surface) of each of the first photorefractive bodies 3 is substantially flat.

Since the first light refracting body 3 is not intended to form an accurate real image or virtual image, the first light refracting body 3 may simply have the above-mentioned “cylindrical lens effect”, that is, a convex lens depending on the location of the first light refracting body 3. The focal length may be different, and there may be distortion or aberration. The aberration may be any of Seidel aberrations such as spherical aberration, coma aberration, astigmatism, field aberration, and distortion aberration. Therefore, it is not necessary to form a virtual image 2 ″, which will be described later, at one place, and it may be formed at least within a certain distance from the first photorefractive body 3.

In FIG. 1, a plurality of first light refracting bodies 3 are adjacent to each other and closely arranged in parallel to form a first light refracting body group 4. However, if the first light refracting body 3 is configured so as to exhibit the above-described effect of the present invention. A plurality of first light refracting bodies 3 may be separated from each other in parallel to form the first light refracting body group 4. In order to obtain the above effect of the present invention, it is preferable that the first photorefractive bodies 3 are closely adjacent to each other.

The number of the first photorefractive bodies (for example, 16 in FIG. 1) with respect to the number of LEDs (the number of vertical columns in FIG. 1, for example, 6 in FIG. 1) has the effect of the present invention. However, the number of the first photorefractive material for one LED row is preferably 1 to 10, more preferably 2 to 6, and particularly preferably 2.5 to 4. The effect of the present invention may not be obtained if the number of the first photorefractive body for the LED 1 row is too large or too small, and the substantial focal length f1 of the first photorefractive body is described later. It may not be possible to set within the correct range.

In the present invention, the distance between the first photorefractive body 3 and the LED 2 is not limited, but the distance a between the first photorefractive body 3 and the “LED 2 closest to the first photorefractive body” is the first distance. It is shorter than the actual focal length f1 of the photorefractive body 3, "the illuminance does not decrease even if the distance from the LED or the illuminating device is away", "the illuminance does not decrease even if it is angularly shifted from the irradiation direction of the LED", This is preferable in order to obtain the effect of the present invention that “LEDs look like line light sources instead of point light sources” more remarkably. The “substantial focal length f1” is defined in consideration of the function of forming an average image when the first light refracting body 3 has an aberration or the like and the focal length varies depending on the location of the first light refracting body 3. Is done.

FIG. 10 shows the relationship between the schematic arrow 2 ′ indicating the LED 2 and the real focal point F <b> 1 of the first photorefractive body 3. The right side of FIG. 10 is the front surface. In FIG. 10, “a substantial distance between the LED and the first photorefractive body closest to the LED” a is a point where the LED emits light and a substantial midpoint in the thickness direction of the first photorefractive body 3. Is the distance. The “substantial focal point of the first photorefractive body” F1 refers to an average focal point as a convex lens that is weighted and averaged with the amount of light transmitted through the first photorefractive body. -B (because b <0, -b is a positive value) is a substantial distance between the first light refractor and the virtual image 2 ″ of the LED formed by the first light refractor.

In the following formula (1), if a <f1, b becomes a negative value, that is, as shown in FIG. 10, the virtual image 2 ″ of the LED 2 ′ is viewed from the first photorefractive body 3 and the LED 2 ′. It will be possible on the back side.
1 / a + 1 / b = 1 / f1 (1)

Since the magnification n is expressed by the following formula (2), 1 <n, and the adjacent LEDs (sideways next to each other in FIG. 1B) look closer and look like a linear light source when viewed from the front. Enough enough, the LED will appear larger.
n = (the size of the virtual image 2 ″ of the LED 2 ′) / (the size of the LED 2 ′)
= (-B) / a (2)

The action / principle is not limited to this, but this makes it possible that “the illuminance does not decrease even if the distance from the LED is far away”, “the illuminance does not decrease even if it is angularly deviated from the irradiation direction of the LED”, “ It is considered that the effect of the present invention that “the LED looks like a line light source instead of a point light source” has been obtained more remarkably.

<Description of fluorescent lamp replacement using first photorefractive material>
The lighting fixture 1 of the present invention can have the same outer dimensions while having almost the same luminous intensity and illuminance as a general-purpose straight tube fluorescent lamp. That is, even if a sufficient number of LEDs 2 are juxtaposed and a wiring space 8 for providing various electric wirings for LEDs is provided, the outer dimensions of the inner tube 5 or the outer tube 15 described later can be reduced to general-purpose straight tube fluorescent lamps. (See, eg, FIGS. 4, 5, 7-9). Therefore, it is preferable that the lighting fixture 1 of the present invention has an outer dimension substantially equal to that of a general-purpose straight tube fluorescent lamp.

FIG. 2 is a schematic overall perspective view of a lighting fixture of the present invention that can be replaced with a straight tube type general-purpose fluorescent lamp. The LED 2 is juxtaposed on the LED plate 6, and the inner tube 5 covers it. Pins 21 are attached to both ends so that current can be taken by attaching to a general-purpose fluorescent lamp fixture. The LED plate 6 may simply fix the LED 2 or may also serve as a wiring board, but various elements for lighting the LED 2 are attached to the wiring space 8 side. In order to save space, it preferably has a role as a wiring board.

Even when the lighting fixture of the present invention is used for an alternative use of a general-purpose straight tube fluorescent lamp, the above-described aspects, preferred ranges, effects, operations and principles of the present invention naturally apply (apply), but This will be described in more detail.

FIG. 3 is a plan view showing an example of juxtaposing LEDs that can be replaced with a straight tube type general-purpose fluorescent lamp. The mode of juxtaposition of the LEDs 2 on the LED plate 6 is not particularly limited. Even if they are juxtaposed in a staggered manner as shown in FIG. 3 (a), a plurality of rows are formed as shown in FIG. 3 (b) or FIG. Even if they are arranged, they may be arranged in one row as shown in FIG. When arranged in rows, the number of rows is not particularly limited, but 1 to 5 LEDs (1 row to 5 rows) are arranged in the vertical direction in order to bring the illuminance etc. closer to a straight tube type general-purpose fluorescent lamp. 2 to 4 (2 to 4 rows) in the vertical direction is particularly preferable, and 3 (3 rows) in the vertical direction is even more preferable as shown in FIG.

The distance between the LEDs 2 is not particularly limited, but is preferably 10 mm to 100 mm, more preferably 20 mm to 70 mm, and particularly preferably 30 mm to 50 mm. If the distance is too wide, the number of LEDs 2 is small, so that sufficient illuminance cannot be secured, and it may not be a substitute for a general-purpose fluorescent lamp. On the other hand, if the distance is too close, it is disadvantageous in terms of cost, and the illuminance becomes too large to be a substitute for a general-purpose fluorescent lamp.

For example, taking as an example a substitute for a general-purpose fluorescent lamp type 40 (length 1198 mm), the LEDs 2 are preferably juxtaposed in a range of 20 to 500 in total per 1198 mm. The range of 50 to 400 is more preferable, the range of 100 to 350 is particularly preferable, and the range of 230 to 320 is particularly preferable in terms of the cost of lighting fixtures and the provision of appropriate illuminance similar to general-purpose fluorescent lamps. A range is more preferred. For example, when juxtaposed in three rows, 20 to 300 in the longitudinal direction (that is, per row) is preferable, 70 to 150 is more preferable, 80 to 120 is particularly preferable, and 90 to 110 is most preferable. preferable. In the case of substituting with another type (length) fluorescent lamp other than 40 type (length 1198 mm), a number range in which the number range is proportionally increased or decreased is preferable.

That is, in general, the lighting fixture 1 of the present invention includes the LED group in which 1 to 5 LEDs are juxtaposed in the vertical direction and 20 to 300 LEDs per 1198 mm in the longitudinal direction. It is preferable that they are juxtaposed so as to obtain the same external dimensions as the tube fluorescent lamp.

FIG. 4 is an example of the lighting fixture 1 of the present invention that can be replaced with a straight tube type general-purpose fluorescent lamp. The inner tube 5 is provided on the outermost side of the lighting fixture 1 of the present invention. The inner tube 5 is provided to protect the inside, to resemble the appearance of a general-purpose fluorescent lamp, to attach the first photorefractive body 3 to the inside thereof, and to fix the side plates to which the pins 21 are attached to both ends thereof. ing. The thickness, material, etc. of the inner tube 5 are not particularly limited, and are selected so as to obtain the above effects.

As shown in FIG. 4, the first light refractor 3 is provided inside the inner tube 5. The inner tube 5 and the first photorefractive body 3 may be separate and in close contact with each other, or may be integrated, but the one body is easier to mold and more durable. Etc. are preferable. Since light is not irradiated below the LED installation plate 6 of the inner tube 5, it may be transparent or opaque, but it may be transparent or opaque from the LED installation plate 6 or from the angle α at which the first photorefractive body 3 is viewed (the first photorefractive body 3. The portion provided with) must be transparent. The inner tube 5 may transmit all or a part of light, may not transmit a specific wavelength, and may scatter a part of incident light. That is, the transmittance, haze, and color are not particularly limited.

As shown in FIGS. 4 and 5, in the lighting fixture 1 of the present invention, the first light refracting body 3 is indispensable integrally with the inner tube 5 or inside the inner tube 5. Regarding the first photorefractive body 3, the number relationship, the positional relationship, etc. between the first photorefractive body 3 and the LED 2 are the same as those described above with reference to FIGS.

In FIG. 4, the first photorefractive body 3 is convex toward the inner side (LED side) of the lighting fixture 1. This is because there are effects such as bringing the external shape of the lighting fixture close to that of a fluorescent lamp, being difficult to get dirty, and easy to clean. The number of the first photorefractive bodies 3 is not particularly limited, but in order to obtain the effect of the present invention suitably, 3 to 20 is preferable in the irradiation region of the LED, 5 to 15 is more preferable, and 8 ~ 10 are particularly preferred. That is, the luminaire 1 of the present invention preferably has three to twenty first light refractors 3 elongated in the longitudinal direction of the luminaire 1 in parallel in the longitudinal direction. 4 and 5, the elongated first photorefractive body whose length is adjusted in accordance with the longitudinal direction of the luminaire (lateral direction in FIG. 4) is in the vertical direction (vertical direction in FIG. 4) in the irradiation region of the LED. Nine in parallel. Here, the “LED irradiation region” refers to the front surface of the LED, and more specifically, the region in the range of ± (90 ° −α) from the front of the LED using α below. As for the size of one of the first photorefractive bodies 3, the length is the same as that of a general-purpose fluorescent lamp to be substituted, and the width is determined by using the thickness (peripheral length) of the luminaire 1, What was obtained by calculation based on the “number of entering” is preferable. Naturally, the thickness (peripheral length) of the luminaire 1 is substantially the same as that of a general-purpose commercial fluorescent lamp to be substituted (for example, straight tube type 40).

As described above, the positional relationship between the LED 2 and the first photorefractive body 3 is preferably determined depending on the real focal length f1 of the first photorefractive body 3, but the real focal length f1 as a convex lens is 1 Depends on the thickness d1 and the width L1 of the center of the light refractor 3. Accordingly, it is preferable that the thickness d1 and the width L1 of the first light refracting body 3 have substantially the same outer dimensions as those of a general-purpose fluorescent lamp, and a preferable “positional relationship between the LED 2 and the first light refracting body 3” can be obtained. (To fit well inside). Although d1 depends on the refractive index of the first photorefractive body 3, it is preferably 2 to 10 mm, more preferably 2.5 to 7 mm, and particularly preferably 3 to 5 mm. Although L1 depends on the refractive index of the first photorefractive body 3, it is preferably 3 to 15 mm, more preferably 4 to 10 mm, and particularly preferably 5 to 6 mm.

The “angle α in FIG. 4” obtained from the angle at which the LED 2 looks at the first photorefractive body 3 is preferably 0 to 30 °, more preferably 5 to 20 °, and particularly preferably 10 to 15 °. It is not necessary to provide the first photorefractive body 3 until α is too small, since light does not come in the first place. If α is too large, there will be light that does not pass through the first photorefractive body 3. An irradiation direction in which the effect of the present invention cannot be obtained may occur. However, the first photorefractive body 3 may be provided on the entire circumference in consideration of easiness of molding and assembly, cost, and the like. That is, it is essential to have the elongated first light refractor 3 on at least the front surface of the LED group.

The first photorefractive body 3 may transmit substantially all of the incident light, or may transmit a part of the incident light, and may not transmit a specific wavelength of a part of the incident light. Alternatively, a part of the incident light may be scattered. That is, the transmittance and haze of the first photorefractive body 3 are not particularly limited. The material may be colorless and transparent, colored or polished glass, but it is preferable that the material is colorless and transparent from the viewpoint of not wasting the amount of light and not generating heat by absorbed light. Moreover, it is also preferable that the light is colored so that the wavelength and spectrum of light can be made closer to light from a general-purpose fluorescent lamp or to be close to natural light.

The material of the first photorefractive body 3 is not particularly limited, inorganic materials such as glass and quartz; vinyl resins such as (meth) acrylic resins, styrene resins and vinyl chloride resins; polyester resins; polycarbonate resins and the like Any of these organic polymer compounds may be used. The material of the first photorefractive body 3 is selected in consideration of optical characteristics, refractive index, strength, durability, cost, workability, and the like. The refractive index (and hence the material) may be determined for the purpose of obtaining a preferable positional relationship by adjusting the substantial focal length f1 of the first photorefractive body 3.

<Overall description of the first and second photorefractive bodies>
The luminaire 1 of the present invention is at least the front surface of the LED group described above, and is arranged outside the first light refracting body 3 and further substantially orthogonal to the first light refracting body 3, thereby providing an effect of a cylindrical lens. In order to further obtain the effects of the present invention, it is preferable that a plurality of the elongated second light refracting bodies 13 having a plurality of second light refracting bodies 13 are provided in parallel.

FIG. 6 is an example of the above-described embodiment, and is a schematic diagram using both the first light refracting body 3 and the second light refracting body 13. A second photorefractive body group 14 including a plurality of second photorefractive bodies 13 is further provided outside the one using only the first photorefractive body 3 shown in FIG. By further providing the second photorefractive body group 14, the present invention states that “the illuminance does not decrease even if the distance from the LED or the luminaire is increased” or “the illuminance does not decrease even if it is angularly shifted from the irradiation direction of the LED”. The above effect can be obtained more remarkably. Further, in the case of using only the first light refracting body 3, the LED 2 looks like a line light source, but looks like a surface light source, becomes less dazzling, and looks more like a general-purpose fluorescent lamp. The second light refracting body 13 is provided so as to be substantially orthogonal to the first light refracting body 3 in order to make the LED 2 look like a surface light source in addition to the above effects.

The shape of the second photorefractive body 13 is not particularly limited as long as it is a long and narrow lens having the effect of a cylindrical lens, but it is essential that the second photorefractive body 13 swells as a whole toward the center line in order to have the effect of a convex lens. . 6 to 9, the lower surface (LED side surface) of the second photorefractive body 13 is a convex surface, and the upper surface (front surface) is a flat surface. However, both the upper surface and the lower surface may be convex or concave. It may be a flat surface, and it is essential that it swells toward the center line as a whole. As a whole, it may have a shape like a kamaboko lens. However, since the upper surface (front surface) may be the outermost surface of the luminaire 1 of the present invention, it should be flat as shown in FIGS. 6 to 9 so that it is difficult to get dust and dirt and is easy to clean. Is preferred.

Since the second light refracting body 13 is not intended to form an accurate real image or virtual image, the second light refracting body 13 may simply have the above-mentioned “cylindrical lens effect”, that is, a convex lens depending on the location of the second light refracting body 13. The focal length may be different, and there may be distortion or aberration.

6 to 9, the second photorefractive body 13 is adjacent to each other and is closely arranged in parallel to form the second photorefractive body group 14, but the above-described effects of the present invention can be obtained. As long as the second photorefractive body 13 is configured, a plurality of the second photorefractive bodies 13 may be separated from each other in parallel to form the second photorefractive body group 14. In order to obtain the above-described effect of the present invention, it is preferable that the second photorefractive bodies 13 are closely adjacent to each other.

The number of second photorefractive bodies (for example, 10 in FIG. 6) with respect to the number of LEDs (for example, 3 in FIG. 6) is determined so as to achieve the effect of the present invention. The number of the second photorefractive body is preferably 1 to 20, more preferably 2 to 15, and particularly preferably 2.5 to 10. The effect of the present invention may not be obtained if the number of the second photorefractive body is too large or too small for the LED 1 row, and the substantial focal length f2 of the second photorefractive body is within a preferable range. May not be set.

In the present invention, the distance between the second photorefractive body 13 and the LED 2 is not limited, but the distance a between the second photorefractive body 13 and the “virtual image 2 of the LED formed by the first photorefractive body” is a. 'Is longer than the actual focal length f2 of the second photorefractive body 13, "the illuminance does not decrease even if the distance from the LED or the luminaire is far away", "even if it is angularly shifted from the irradiation direction of the LED It is preferable in order to obtain the effect of the present invention that “illuminance does not decrease” and “LED looks like a surface light source” more remarkably. The “substantial focal length f2” is defined in consideration of the function of forming an average image when the second photorefractive body 13 has aberration and the focal length varies depending on the location of the second photorefractive body 13. Is done.

<Description of a fluorescent lamp alternative using the first and second photorefractive bodies>
FIGS. 7 to 9 show an example of the lighting fixture of the present invention that uses both the first light refracting body 3 and the second light refracting body 13 and can be replaced with a straight tube type general-purpose fluorescent lamp. Even when both the first light refracting body 3 and the second light refracting body 13 are used, the same external dimensions as those of a general-purpose fluorescent lamp can be obtained (FIGS. 7 to 9). Therefore, the lighting fixture 1 of the present invention has an outer dimension substantially equal to that of a general-purpose straight tube fluorescent lamp even when both the first and second photorefractive bodies are used. preferable.

Even when the lighting apparatus 1 of the present invention using both the first light refracting body 3 and the second light refracting body 13 is used for an alternative use of a general-purpose straight tube fluorescent lamp, naturally, the above-described aspect of the present invention is preferable. The scope, effect, action / principle, etc. apply (applies), but will be described in more detail below.

7 to 9 show an example of the lighting fixture 1 of the present invention that can be replaced with a straight tube type general-purpose fluorescent lamp. An outer tube 15 is provided on the outermost side of the lighting fixture 1 of the present invention. The outer tube 15 is provided to protect the inside, to resemble the appearance of a general-purpose fluorescent lamp, to attach the second photorefractive body 13 to the inside, and to fix the side plates to which the pins 21 are attached to both ends thereof. Yes. The thickness, material, etc. of the outer tube 15 are not particularly limited, and are selected so as to obtain the above effects.

As shown in FIGS. 7 to 9, a second photorefractive body 13 is provided inside the outer tube 15. In FIG. 7, since the drawing becomes complicated, only two second light refracting bodies 13 are illustrated, but actually, a plurality are arranged in parallel from the left end to the right end without any gap. The outer tube 15 and the second photorefractive body 13 may be separate and in close contact with each other, or may be integrated. However, as shown in FIGS. It is preferable in terms of easy molding, durability, and space saving. Since light is not irradiated below the LED installation plate 6 of the outer tube 15, it may be transparent or opaque, but the front surface from the LED installation plate 6 or from the angle α (the portion where the first photorefractive body 3 is provided) is It is preferably transparent. The outer tube 15 may transmit all or a part of light, may not transmit a specific wavelength, and may scatter a part of incident light. That is, the transmittance, haze, and color are not particularly limited.

As shown in FIGS. 7 to 9, it is preferable that the lighting device 1 of the present invention is provided with the second photorefractive body 13 integrally with the outer tube 15 or inside the outer tube 15. Regarding the second photorefractive body 13, the number relationship, the positional relationship, etc. between the second photorefractive body 13 and the LED 2 are the same as those described above with reference to FIG.

7 to 9, the second photorefractive body 13 is convex toward the inner side (LED side) of the lighting fixture. This is because there are effects such as bringing the external shape of the lighting fixture close to that of a fluorescent lamp, being difficult to get dirty, and easy to clean.

The actual focal length f2 of the second photorefractive body 13 as a convex lens depends on the thickness d2 and the width L2 of the central portion of the second photorefractive body 13. Therefore, it is preferable that the thickness d2 and the width L2 of the second light refracting body 3 be the same external dimensions as those of a general-purpose fluorescent lamp. “LED2, the first light refracting body 3 and the second light refracting body 3 are preferable. It is determined so that “13 positional relations” can be obtained (so that it can fit well inside). Although d2 depends on the refractive index of the second photorefractive body 13, it is preferably 1 to 7 mm, more preferably 1.5 to 5 mm, and particularly preferably 2 to 3 mm. L2 is preferably 1 to 7 mm, more preferably 1.5 to 5 mm, and particularly preferably 2 to 3 mm.

The second photorefractive body 13 only needs to be at least in a portion irradiated with light from the LED 2, that is, the second photorefractive body 13 only needs to be elongated at least on the front surface of the LED group, but is easy to mold and assemble. In consideration of cost and the like, the second photorefractive body 13 may be provided on the entire circumference. Moreover, the shape where the elongate 2nd photorefractive body 13 was wound helically on the circumference of the lighting fixture 1 may be sufficient. In that case, the number of the second light refracting bodies 13 is one at a glance, but there are a plurality of the second light refracting bodies 13 in parallel. .

The optical properties, materials, and the like of the second light refracting body 13 are the same as those described in the location of the first light refracting body 3, including its preferred range. The material of the second photorefractive body 13 is selected in consideration of optical characteristics, refractive index, strength, durability, cost, workability, and the like.

<Lighting equipment>
The shape of the lighting fixture 1 of the present invention is not particularly limited, and may be any of a tubular shape (cylindrical shape), a planar shape, and the like. Moreover, the tubular thing may be a straight rod shape (straight tube type), the tubular thing may be a ring shape (round shape), a spiral shape, or a folded shape. (U type etc.) is also good. Further, the flat shape may be any of a flat (low height) cylindrical shape, a prismatic shape, and the like.

Since the present invention can be substituted for a general-purpose fluorescent lamp due to the above-described effects, the shape of the lighting fixture 1 of the present invention is particularly preferably a standard shape of a general-purpose fluorescent lamp. 10 type, 15 type, 20 type, 30 type, 40 type (length 1198 mm), 50 type (length 2367 mm), etc. are preferable, but 40 type (1198 mm) is also necessary for producing the effect of the present invention. Those having the same shape and appearance as those of the above general-purpose fluorescent lamps are particularly preferable. In general, in the case of a long luminaire, since high illuminance is expected at a distant place, the effect of the luminaire of the present invention that the illuminance is large at a distant point or a point in a direction of a shifted angle can be exhibited more. .

The lighting fixture 1 of the present invention can be applied to an existing lighting fixture for fluorescent lamps such as a fluorescent lamp socket without mechanical work. In addition, although not necessarily essential, the present invention can be applied to an existing lighting device for a fluorescent lamp by only a very simple electrical work by simply cutting the wiring to the inverter in order to improve the luminous intensity. Therefore, it is preferable that the lighting fixture 1 of the present invention is used by being mounted on a general-purpose fluorescent lamp lighting fixture. Therefore, it is preferable that the shape and performance of the pin 21 to be inserted into the fluorescent lamp socket are the same as those of a general-purpose fluorescent lamp. Moreover, it is preferable that the internal electrical wiring of the lighting fixture 1 is made so that it can be used simply as it is inserted into an existing fluorescent lamp socket.

Examples of “general-purpose fluorescent lamps” that can replace or replace the lighting fixture 1 of the present invention include a manual start method, a lighting tube method (FL), a rapid start method (FLR), and a high-frequency lighting method (Hf, FHF). Can be mentioned. When substituting for a “general-purpose fluorescent lamp” of a high-frequency lighting system, it is sufficient to remove some of the appliances.

According to the present invention, in FIG. 11, in the illuminance on the plane P existing at a distance of 1 m in the direction of light irradiation from the center M of the luminaire 1, it passes through the center M of the luminaire 1. The illuminance at a point (BL, BR) at an angle (BL, BR) formed by a straight line L extending from the lighting fixture 1 in a direction perpendicular to the lighting fixture 1 with the plane P is a straight line passing through the center of the lighting fixture 2 and the plane. It is possible to provide a luminaire having an angle of 90 ° or more that is ¼ or more of the illuminance at the point H where the angle is 90 ° (that is, the point H lowered vertically from the midpoint M of the luminaire 1 toward the plane P). In other words, in the present invention, in FIG. 11, it is preferable that the illuminance at the point BL and the point BR on the plane P is a luminaire having ¼ or more of the illuminance at the point H. That is, the illuminance on the plane P existing at a distance of 1 m in the light irradiation direction from the center of the lighting fixture 1 passes through the center of the lighting fixture 1 and extends perpendicularly from the lighting fixture 1. The illuminance at a point (BL and BR) where the angle between the straight line and the plane P is 45 ° is 1 / of the illuminance at the point H where the angle between the straight line passing through the center M of the luminaire 1 and the plane P is 90 °. The above-mentioned lighting fixture which is 4 or more is preferable.

In general-purpose straight tube fluorescent lamps, the illuminance at points BL and BR is ¼ or more of the illuminance at point H in any manufacturer's products. Then, the illuminance at the point BL and the point BR is less than ¼ of the illuminance at the point H (for example, Non-Patent Documents 1 and 2). That is, according to the present invention, in the lighting fixture using the LED, an optical characteristic equivalent to that of a general-purpose fluorescent lamp was obtained. The illuminance at the point BL and the point BR is more preferably 1 / 3.5 or more of the illuminance at the point H, particularly preferably 1/3 or more, and further preferably 1 / 2.5 or more. .

According to the present invention, in FIG. 11, the illuminance at a point H that is 1 m away from the central point M of the lighting fixture 1 in a direction perpendicular to the lighting fixture 1 in the light irradiation direction is the center of the lighting fixture 1. From point M, it is possible to provide a luminaire that is 1/3 or more of the illuminance at point H, which is 0.5 m away from the luminaire in a direction perpendicular to the luminaire. That is, in the present invention, in FIG. 11, the illuminance at a point H on a plane 1 m away is preferably 1/3 or more of the illuminance at a point H on a plane 0.5 m away. That is, the illuminance at a point H that is 1 m away from the central point M of the lighting fixture 1 in a direction perpendicular to the lighting fixture 1 in the direction of light irradiation is from the central point of the lighting fixture with the lighting fixture. The above luminaire is preferably 1/3 or more of the illuminance at a point 0.5 m away in a direction perpendicular to the direction of light irradiation.

In general-purpose straight tube fluorescent lamps, the above value is 1/3 or more, but in a tubular lighting fixture using currently known LEDs, it is about 1 / 3.5 or worse. That is, according to the present invention, in the lighting fixture using the LED, an optical characteristic equivalent to that of a general-purpose fluorescent lamp was obtained.

The action / principle that the illuminance of the present invention does not decrease even if the distance from the LED does not decrease and the illuminance does not decrease even if the angle deviates from the irradiation direction of the LED is not clear, but the following may be considered. However, the present invention is not limited to the range where the following actions and principles are established. That is, by the photorefractive body having the effect of a convex lens, the virtual image 2 ″ of the LED larger than the LED 2 ′ is placed behind the LED 2 (left side of the arrow 2 ′ of the LED 2 in FIG. 10) (b <0 in the expression (1)). (In formula (1), a <f). Therefore, it is considered that the illuminance can be maintained even when the LED is separated from the LED.

Also, in this case, since 1 <(− b) / a, and the image is magnified, it is considered that the virtual image 2 ″ of adjacent LEDs are connected, and the point light source becomes a line light source or a surface light source.

Also, since light passes through the photorefractive body, the phase of the light emitted from the LED shifts, and the waves overlap so as to amplify each other. Therefore, it is considered that the illuminance can be maintained even when the LED is separated from the LED.

Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to these examples as long as the gist thereof is not exceeded.

Example 1
The lighting fixture 1 shown in FIGS. 4 and 5 having the same size and appearance as a general-purpose fluorescent lamp 40 (length: 1198 mm) was manufactured. That is, the LEDs 2 are arranged in three rows as shown in FIGS. 4 and 5, and a total of 288 LEDs 2 were used in each row. Further, as shown in FIG. 2, pins 21 are provided at the left end and the right end so that they can be mounted on a general-purpose fluorescent lamp lighting fixture, and are electrically wired so as to be adapted to the general-purpose fluorescent lamp lighting fixture. did.

As LED2, white LED manufactured by CREE was used. The first photorefractive body 3 and the inner tube 5 were manufactured integrally. The thickness d1 of the first photorefractive body 3 was 4 mm, the width L1 was 5 mm, and the thickness of the inner tube 5 portion was 1 mm. The angle α was 13 °. The number of the first photorefractive bodies 3 was nine as shown in FIGS. 4 and 5, and the material was acrylic resin.

Thus, a lighting fixture adapted to the general-purpose LED rapid start method (FLR) was obtained. Hereinafter, the lighting fixture of the present invention having the first photorefractive body 3 is referred to as “lighting fixture A”. When the lighting fixture A was mounted on a lighting fixture for a fluorescent lamp and turned on, there was no change in appearance from a general-purpose fluorescent lamp. Moreover, the light source of LED2 was connected in the vertical direction of FIG. 4 and it looked like a linear light source, and it did not appear to emit light from LED1 point, and there was no glare.

Moreover, the power consumption of the lighting fixture A was 13W. On the other hand, the general-purpose fluorescent lamp 40 type actually consumes 37 W for illumination and 6 W for the ballast, so the total is 43 W. Therefore, since 13W / 43W = 0.30≈1 / 3, the power consumption of the lighting fixture A was about 1/3 of the fluorescent lamp having the same shape. Moreover, the lifetime should be 10 times or more.

Example 2
The lighting apparatus 1 shown in FIGS. 7 to 9 having the same size and appearance as a general-purpose fluorescent lamp 40 (length 1198 mm) was manufactured. That is, the second photorefractive body 13 is provided on the outside of the luminaire that is substantially the same as in the first embodiment and is manufactured slightly thinner, as shown in FIGS. Lighting fixtures were manufactured by electrical wiring so as to adapt to the lighting fixtures.

The second photorefractive body 13 and the outer tube 15 were manufactured integrally. The thickness d2 of the second photorefractive body 13 was 2.5 mm, and the width L2 was 2.5 mm. The material of the second photorefractive body 13 was an acrylic resin.

Thus, a lighting fixture adapted to the general-purpose LED rapid start method (FLR) was obtained. Hereinafter, the lighting fixture of the present invention having the first light refracting body 3 and the second light refracting body 13 is referred to as a “lighting fixture B”. When the lighting fixture B was mounted on a lighting fixture for a fluorescent lamp and turned on, there was no change in appearance from a general-purpose fluorescent lamp. In addition, the light sources of the LED 2 are connected to each other in the vertical and horizontal directions and look like a surface light source, do not appear to emit light from the LED 1 point, and are not dazzled. There was no place.

Further, the power consumption was about 1/3 of the fluorescent lamp having the same shape as in Example 1. Moreover, the lifetime should be 10 times or more.

Comparative Example 1
In Example 1, a lighting fixture was obtained in the same manner as Example 1 except that the first photorefractive body 3 was not provided. Hereinafter, the lighting fixture using LEDs that does not have the photorefractive body is referred to as “lighting fixture Q”. When the lighting fixture Q was mounted on a lighting fixture for a fluorescent lamp and turned on, the first photorefractive body 3 was not provided, so that the LED 2 was seen as a point light source as it was, and it was dazzling when staring at the LED 2. For this reason, the appearance is completely different from that of general-purpose fluorescent lamps.

Example 3
Using the luminaire A of the present invention, the illuminance at a place away from the luminaire A and the illuminance at a place where the irradiation angle is shifted from directly below the luminaire A were compared with a commercially available fluorescent lamp and the luminaire Q.

In FIG. 11, the illuminance on the plane P existing at a distance of 1 m in the direction of light irradiation was measured from the center M of the tubular lighting fixture 1 obtained in Example 1. A point passing through M and a straight line L extending perpendicularly from the luminaire 1 with the plane P is at an angle of 45 ° (BL and BR in FIG. 11), a point at 30 ° (AL and AR in FIG. 11), The illuminance was measured at a point just below M, that is, at a point where the angle formed by the straight line passing through M and the plane P was 90 ° (the leg of the perpendicular dropped from M to the plane P) (H in FIG. 11).

Also, from a point that is 0.5 m laterally away from the left end of the luminaire 1, a perpendicular foot (H ′ in FIG. 11) that was dropped on the plane P and 0.5 m laterally away from the right end of the luminaire 1. From the point, the illuminance at the point of the perpendicular foot (H ″ in FIG. 11) on the plane P was also measured. The illuminance was measured according to a conventional method using a Digital CC & CVDC power supply using an illuminance meter Photo-2000 manufactured by Hangzhou Far Electronic Equipment Company.

Table 1 shows the point in FIG. 11 where the illuminance was measured. Table 2 shows the illuminance at each point. The unit in all tables is “Lux”. Hereinafter, [illuminance at point BL] / [illuminance at point H] or the like may be simply expressed as “BL / H” or the like.

Comparative Example 2
The illuminance of the lighting fixture Q was measured in the same manner as in Example 3. The results are shown in Table 3 below.

Reference example 1
The illuminance was measured in the same manner as in Example 3 using a commercially available 43 W (37 W for illumination, 6 W for ballast) LED rapid start type fluorescent lamp 40 (length: 1198 mm). The results are shown in Table 4.

As can be seen from the results shown in Table 2, the illuminance A of the present invention is 138/460 = 1 / 3.3 in comparison with the illuminance at the BL point, and the BR point. The illuminance was 127/460 = 1 / 3.6 compared to the illuminance at the point H. In addition, as can be seen from the results of Table 4, the illuminance at the BL and BR points is 79/165 = 1/2 compared to the illuminance at the H point, as can be seen from the results in Table 4. .1, 80/165 = 1 / 2.1. Therefore, neither the luminaire A nor the luminaire (general-purpose fluorescent lamp) has decreased much in illuminance even when the angle is shifted.

On the other hand, as can be seen from the results in Table 3, in the lighting fixture Q, the illuminance at the BL and BR points is 77/630 = 1 / 8.2 compared to the illuminance at the H point. The illuminance decreased greatly. From this, it was found that without the first photorefractive body 3, the illuminance at a point angularly deviated from the irradiation direction of the luminaire decreased significantly. The lighting fixture A of the present invention having the first light refracting body 3 has less angle dependency of illuminance than the lighting fixture Q not having the first light refracting body 3, and this characteristic is a general purpose. It turned out to be close to a fluorescent lamp.

Also, as shown in Tables 1 to 4, a result showing the same tendency was obtained at the point of ± 30 ° C. instead of the point of ± 45 ° C. From this, it was found that the illuminating device of the present invention does not decrease the illuminance similarly to a general-purpose fluorescent lamp even if it is angularly deviated from the irradiation direction of the illuminating device.

Further, in the lighting fixture A, as shown in Table 2, H ′ illuminance / H illuminance = 367/460 = 1 / 1.25, H ″ illuminance / H illuminance = 372/460 = 1 / It was as large as 1.24. On the other hand, even in a general-purpose fluorescent lamp, as shown in Table 4, H ′ illuminance / H illuminance = 123/165 = 1 / 1.34, H ″ illuminance / H illuminance = 122/165 = 1. /1.35, almost the same value. From this, the lighting fixture A of the present invention having the first photorefractive body 3 has almost no angular dependence on the illuminance in the lateral direction as well as the general-purpose fluorescent lamp.

Example 4
Example 1 except that the position of the plane P was changed to 0.5 m, 1.5 m, 2.0 m, 2.5 m, and 3.0 m other than 1.0 m using the lighting fixture A of the present invention. Evaluation was performed in the same manner. Table 5 shows the point in FIG. 11 where the illuminance was measured. The evaluation results are shown in Table 6 together with the results of 1.0 m.

Reference example 2
Other than changing the position of the plane P to 0.5 m, 1.5 m, 2.0 m, 2.5 m, and 3.0 m other than 1 m using the same lighting fixture (general-purpose fluorescent lamp) as in Reference Example 1. Were evaluated in the same manner as in Examples 1 and 4 and Reference Example 1. The results are shown in Table 7 together with the results of 1.0 m.

Although not shown in the table, in the lighting fixture A of the present invention, the distance between the point M and the plane P is 0.5 m as in the case of Example 3 in which the distance between the point M and the plane P is 1.0 m. Even in the range of ~ 3.0m, the values of BL / H, BR / H, AL / H, AR / H are sufficiently large, and the illuminance does not drop much even at a point angularly shifted from the irradiation direction. Even if it fell, it was almost the same as a general-purpose fluorescent lamp.

As shown in Table 6, in the luminaire A of the present invention, the point between the point M and the plane P is 1 m below the illuminance at the point just below the distance between the point M and the plane P is 0.5 m. The ratio of H to illuminance was 460 Lux / 1320 Lux = 1 / 2.9. On the other hand, as can be seen from Table 7 in Reference Example 2 above, even in a general-purpose fluorescent lamp, 165 Lux / 324 Lux = 1 / 2.0, which were almost the same. It was found that when the first photorefractive body 3 is present, the rate of decrease in illuminance is small even when the distance from the luminaire 1 is increased.

In addition, it was found that the lighting fixture A of the present invention did not decrease much in illuminance even at a distance of 3.0 m from the lighting fixture, and was almost the same as a general-purpose fluorescent lamp.

Comparative Example 2
Using the lighting fixture Q, the point H (distance (MH) between the point M and the plane P is 0.5 m) that is 0.5 m away, and the point H (distance (MH between the point M and the plane P (MH) that is 0.5 m away) ) Measured the illuminance of 1 m) in the same manner, and found to be 2160 Lux and 630 Lux (580/2000 = 1 / 3.4), respectively. It has been found that without the first photorefractive body 3, the illuminance drops significantly at a remote location.

Example 5
When evaluated in the same manner as in Example 3 and Example 4 except that the luminaire B used in Example 2 was used in place of the luminaire A, the distance between the point M and the plane P was 0.5 m to 3 m. In the range of 0.0 m, the values of BL / H, BR / H, AL / H, AR / H, H ′ / H, and H ″ / H are sufficiently large and deviated from the irradiation direction in an angular manner. The illuminance at the point was almost the same as in Example 3, and the illuminance at the BL and BR points was 1 / 3.3 compared to the illuminance at the H point.

In addition, the ratio of the illuminance at the point H directly below the distance of 0.5 m to the point M to the illuminance at the point H directly below 1 m from the point M to the plane P was 1 / 2.9. .

In addition, even when the distance from the lighting fixture B is 3.0 m, the decrease in illuminance is almost as small as that of the lighting fixture A and the general-purpose fluorescent lamp, and it is almost the same as that of the general-purpose fluorescent lamp.

The “lighting fixture using LED” of the present invention keeps the features of LED such as no heat, low power consumption, environmental friendly, long life, etc. In addition, the illuminance does not decrease even if it is angularly deviated from the LED irradiation direction, and it looks like a linear light source / surface light source. In addition to replacing fluorescent lamps, it is widely used in all fields where lighting is used.

Claims

An LED group having a plurality of LEDs arranged side by side, and a plurality of elongated first light refractors having the effect of a cylindrical lens are arranged in parallel on at least the front surface of the LED group. lighting equipment.
A plurality of elongated second light refractors having a cylindrical lens effect are arranged in parallel at least on the front surface of the LED group, outside the first light refractor and substantially orthogonal to the first light refractor. The lighting fixture according to claim 1.
The lighting fixture according to claim 1, wherein a distance between the first light refracting body and the LED closest to the first light refracting body is shorter than a substantial focal length of the first light refracting body.
The LED group is composed of 1 to 5 LEDs in the vertical direction and 20 to 300 LEDs in the longitudinal direction per 1198 mm, and is juxtaposed so that the same external dimensions as a general-purpose straight tube fluorescent lamp can be obtained. The lighting fixture according to any one of claims 1 to 3, wherein the lighting fixture is provided.
5. The luminaire according to claim 4, comprising three to 20 first photorefractive bodies elongated in the longitudinal direction of the luminaire in parallel in the longitudinal direction of the LED irradiation region.
Furthermore, the lighting fixture according to claim 1, further comprising an inner tube integrated with the first photorefractive body on the outermost side.
The lighting fixture according to claim 2, further comprising an outer tube integrated with the second photorefractive body on the outermost side.
The lighting fixture according to any one of claims 1, 2, 3, 6, and 7 having an outer dimension substantially equal to a general-purpose straight tube fluorescent lamp.
In the illuminance on a plane existing at a distance of 1 m in the light irradiation direction from the center of the luminaire, a straight line passing through the center of the luminaire and extending perpendicularly from the luminaire is the plane. The luminaire according to claim 1 or 2, wherein the illuminance at a point where the angle is 45 ° is ¼ or more of the illuminance at a point where the angle formed by a straight line passing through the center of the luminaire and the plane is 90 °.
The illuminance at a point 1 m away from the central point of the lighting fixture in a direction perpendicular to the lighting fixture in the direction of light irradiation is light irradiation from the central point of the lighting fixture in a direction perpendicular to the lighting fixture. The luminaire according to claim 1 or 2, wherein the luminaire is 1/3 or more of the illuminance at a point 0.5 m away in a direction to be measured.