JP2011060719A - Lighting fixture using led - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting fixture having a plurality of LEDs in which the LEDs are not perceived like a point light source while demonstrating features of the LEDs such as having no heat, little power consumption, and a long life, and illuminance is not suddenly deteriorated even if the object is separated from the LED or is shifted in angle from the irradiation direction of the LED. <P>SOLUTION: The lighting fixture has an LED group having a plurality of LEDs arranged in a row on an LED installation plate, and has a plurality of long and slender first light refractors which are cylindrical lenses with a convex lens cross-section arranged in parallel on the front surface of the LED group densely mutually adjoining in axial direction of the inner tube, in one body with the inner tube or inside the inner tube. The distance between the first light refractor and the LED nearest the first light refractor is shorter than the real focal distance of the first light refractor. The LED group has the LEDs on the LED installation plate 20 pieces to 800 pieces per 1,198 mm arranged in a row, and has an outline dimension substantially equal to a general-purpose straight tube fluorescent lamp. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  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).

  While these lighting fixtures using LEDs have features such as having no heat, low power consumption, and long life compared to fluorescent lamps 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 in such a place, there has been a problem that the illuminance is excessively increased in the vicinity or the entire lighting fixture becomes expensive. In addition, since the illuminance drops sharply at a location away from the luminaire, the conventional luminaire using the LED needs to use a spotlight separately, which is troublesome and disadvantageous in terms of cost.

  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. .

  The 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 JP 2004-039594 A JP 2006-024381 A JP 2007-227210 A

Nippon Userac Co., Ltd. Product Catalog (2007) Nippon Advantage Co., Ltd. Product Catalog (2007)

  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 inventor has arranged a plurality of elongated first photorefractive bodies, which are cylindrical lenses having a cross section of a convex lens, in parallel on at least the front surface of a plurality of LEDs arranged in parallel. By solving the above problems and problems, we found that the LED that emits light looks like a line light source or a surface light source instead of a point light source, and the illuminance does not decrease far, and the illuminance does not decrease even in an oblique direction. The present invention has been completed.

  That is, the present invention includes an LED group having a plurality of LEDs juxtaposed on an LED installation plate, and at least the front surface of the LED group is a cylindrical lens having a convex lens cross section at least on the front surface. The body is integrated with the inner tube or inside the inner tube, adjacent to each other in the axial direction of the inner tube, and a plurality of closely arranged in close proximity to the first photorefractive body and the first photorefractive body. The distance from the LED is shorter than the actual focal length of the first photorefractive body, and the LED group includes 20 to 800 LEDs per 1198 mm on the LED installation plate. A lighting apparatus that is juxtaposed and juxtaposed so as to obtain the same external dimensions as a general-purpose straight tube fluorescent lamp, and has substantially the same external dimensions as a general-purpose straight tube fluorescent lamp Is to provide.

  Further, the present invention provides an elongated second photorefractive body which is a cylindrical lens at least in front of the LED group, outside the first photorefractive body, and further substantially orthogonal to the first photorefractive body. The above-mentioned lighting fixture comprising a plurality of the above 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 exhibiting features, it was a drawback of LEDs for lighting fixtures, the illuminance suddenly dropped when the distance from the LED was away, the illuminance suddenly dropped when angularly shifted from the irradiation direction of the LED, etc. It is possible to provide a lighting fixture that solves the above problem. Since the illuminance is high even at a place away from the luminaire (or the decrease in illuminance can be kept low), there is no need to use a spotlight separately.

  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 a schematic whole perspective view of an example of the lighting fixture of this invention. It is a top view which shows an example of juxtaposition of LED in the lighting fixture of this invention. It is an expansion perspective view of an example of the lighting fixture of this invention. It is a VV arrow sectional view of Drawing 3, and is a section whole figure of an example of the lighting fixture of the present invention. It is an example of the lighting fixture of this invention, and is a perspective view of what used both the 1st photorefractive body and the 2nd photorefractive body. FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIGS. 5 and 7, which is an example of a lighting fixture according to the present invention, and is a vertical cross-sectional view using both a first light refracting body and a second light refracting body. (A) Overall cross-sectional view (b) Enlarged cross-sectional view of the portion enclosed by the square in the overall cross-sectional view (a) It is IX-IX arrow sectional drawing of FIG. 5 and FIG. 6, is an example of the lighting fixture of this invention, and is sectional drawing of what used both the 1st photorefractive body and the 2nd photorefractive body. It is a figure which shows the positional relationship of LED and the 1st photorefractive body in the lighting fixture of this invention, and is a figure explaining the effect of this invention. It is a figure explaining the undesirable positional relationship of LED and a 1st photorefractive body, and not showing the effect of this invention. It is a figure which shows the place of each point which measured the illumination intensity in the Example.

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

<Overall Description of Using First Photorefractive Material>
The lighting fixture 1 of this invention is characterized by satisfy | filling all the following (1)-(4).
(1) having an LED group having a plurality of LEDs juxtaposed on an LED installation plate; and
(2) (a) At least on the front surface of the LED group,
(B) an elongated first photorefractive body which is a cylindrical lens having a cross section of a convex lens;
(C) integrally with the inner tube or inside the inner tube, closely adjacent to each other in the axial direction of the inner tube,
(D) The distance between the first photorefractive body and the “LED closest to the first photorefractive body” is shorter than the substantial focal length of the first photorefractive body,
(3) The above LED group is juxtaposed so that 20 to 800 LEDs per 1198 mm are juxtaposed on the LED installation plate, and the same external dimensions as a general-purpose straight tube fluorescent lamp are obtained.
(4) It has the external dimensions substantially equal to a general-purpose straight tube fluorescent lamp.

  The distance between the light emitting points (center portions) of the adjacent LEDs 2 is preferably 1 mm to 100 mm, more preferably 2 mm to 30 mm, and particularly preferably 3 mm to 10 mm. When the distance is too short and the density is too high, heat may be generated or power consumption may increase, and the LED characteristics 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.

  As the LED 2, any general-purpose LED can be used, 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.

  The first photorefractive body 3 has the effect of a cylindrical lens as a convex lens. The first photorefractive body 3 is a cylindrical lens having a convex lens cross section, and is preferably elongated.

  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.

  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. The lower surface of the first photorefractive body 3 (the LED side surface, the inside of the lighting device) and the upper surface (the front surface, the direction in which the light is irradiated, the outside of the lighting device) are only required to swell as a whole toward the center line. , Itself may be concave or planar. However, the lower surface (LED-side surface) of the first photorefractive body 3 is preferably a convex surface, and the upper surface (front surface) is preferably a flat surface or a convex surface. 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 a flat surface or a substantially flat surface so that dust and dirt are not easily attached and cleaning is easy. 3 and 4, the outermost surface of the entire luminaire is an arc formed by the luminaire itself. However, as each first light refractor 3, the upper surface (front surface) has a large radius of curvature. Convex or 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 only has to have the above-mentioned “effect of a cylindrical lens of a convex lens”, that is, the location of the first light refracting body 3. The focal length of the convex lens may be different depending on the lens, 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, completely at one place, and it is sufficient that it is formed at least within a certain distance from the first light refracting body 3. The first light refracting body 3 is a convex lens. A cylindrical lens having a cross section is preferable.

  As long as the first light refracting body 3 is configured so as to exhibit the above-described effects of the present invention, a plurality of the 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 acquire the said effect, it is preferable that the 1st photorefractive body 3 adjoins mutually and is closely paralleled.

  The number of first photorefractive bodies with respect to the number of LED rows is determined so as to achieve the effect of the present invention, but the number of first photorefractive bodies with respect to one LED row is preferably 1 to 10, and 2 to 6 Is more preferable, and 2.5 to 4 is particularly preferable. 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, regarding the distance between the first photorefractive body 3 and the LED 2, the distance a between the first photorefractive body 3 and “the LED 2 closest to the first photorefractive body” is the first photorefractive body 3. It is essential that the actual focal length f1 be shorter. By such an arrangement, “the illuminance does not decrease even if the LED or the lighting fixture is far away”, “the illuminance does not decrease even if the LED is angularly displaced from the irradiation direction”, “the LED is a point light source The above-described effect of the present invention can be remarkably obtained. 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. 8 shows a relationship between the schematic arrow 2 ′ indicating the LED 2 and the substantial focal point F <b> 1 of the first light refracting body 3. The right side of FIG. 8 is the front surface (the direction in which light is irradiated, the outside of the lighting fixture). In FIG. 8, “the 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 of the first photorefractive body 3 in the thickness direction. 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 photorefractive body and the virtual image 2 ″ of the LED formed by the first photorefractive body. FIG. A form of the present invention in which the distance a between the photorefractive body 3 and the “schematic arrow 2 ′ indicating the LED 2 closest to the first photorefractive body 3” is shorter than the substantial focal length f1 of the first photorefractive body. Is shown.

In the following formula (1), if a <f1, b becomes a negative value, that is, as shown in FIG. 8, 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 Y is expressed by the following formula (2), 1 <Y, and the LEDs appear large enough that the adjacent LEDs approach each other and look like a linear light source when viewed from the front. . In such a case, the illuminance does not decrease even away from the lens (ie, from the lighting fixture).
Y = (size of LED 2 ′ virtual image 2 ″) / (size of LED 2 ′)
= (-B) / a (2)

  On the other hand, FIG. 9 shows the “positional relationship between the LED and the first light refractor closest to the LED” which is not the present invention and does not show the effect of the present invention. As in FIG. 8, the right side of FIG. 9 is the front surface (the direction in which light is emitted, the outside of the lighting fixture). In FIG. 9, the distance a between the first photorefractive body 3 and “schematic arrow 2 ′ indicating the LED 2 closest to the first photorefractive body 3” is larger than the substantial focal length f1 of the first photorefractive body. long. In such a case, the magnification Y is Y <1, and the illuminance drops sharply away from the lens (ie, from the lighting fixture).

  The action / principle is not limited to the above. However, according to such action / principle, “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 shifted 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.

<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 is provided for various electric wirings for LEDs, 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. (For example, see FIGS. 3 to 7). Therefore, the luminaire 1 of the present invention has an outer dimension substantially equal to that of a general-purpose straight tube fluorescent lamp. Here, “substantially the same external dimensions” is not limited to the same external dimensions as general-purpose straight tube fluorescent lamps, but is close to an extent that can be applied to general-purpose fluorescent lamp sockets without problems. It is a dimension.

  FIG. 1 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. 2 is a plan view showing an example of juxtaposing LEDs that can be replaced with a straight tube type general-purpose fluorescent lamp. The form 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. 2A, a plurality of rows are formed as shown in FIG. 2B 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 and the like closer to a straight tube general-purpose fluorescent lamp. 2 to 4 in the vertical direction (2 to 4 rows) is particularly preferable, and 2 in the vertical direction (2 rows) or 3 in the vertical direction (3 rows) as shown in FIG. preferable.

  The distance between the LEDs 2 is not particularly limited, but is preferably 1 mm to 100 mm, more preferably 2 mm to 30 mm, and particularly preferably 3 mm to 10 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 800 in total per 1198 mm. The range of 50 to 600 is more preferable, the range of 100 to 500 is particularly preferable, and the range of 230 to 350 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, 10 to 300 in the longitudinal direction (that is, per row) is preferable, 20 to 250 is more preferable, 80 to 200 is particularly preferable, and 80 to 120 is most 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, comprehensively, the lighting fixture 1 of the present invention is such that the LED group has 1 to 5 LEDs (1 to 5 rows) in the vertical direction (direction perpendicular to the longitudinal direction), and 1198 mm in total. 20 to 800 are juxtaposed, and preferably juxtaposed so that the same external dimensions as a general-purpose straight tube fluorescent lamp can be obtained.

  FIG. 3 shows 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 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. 3, the first photorefractive body 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. However, the front surface of the inner tube 5 is preferably colorless and transparent.

  As shown in FIGS. 3 and 4, in the lighting fixture 1 of the present invention, the first photorefractive body 3 is essential to be integrated 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 described above.

  In FIG. 3, 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, 5 to 15 is more preferable in the irradiation region of the LED, and 8 10 is particularly preferable. 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 perpendicular to the longitudinal direction. . In FIGS. 3 and 4, the elongated first photorefractive body whose length is adjusted in accordance with the longitudinal direction of the luminaire (lateral direction of FIG. 3) is arranged in the vertical direction (vertical direction of FIG. 3) 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, is a region in a range of ± (90 ° −α) from the front of the LED using the following α.

  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 light refracting body 3 is determined depending on the substantial focal length f1 of the first light refracting body 3, but the substantial focal length f1 as a convex lens is the first light refracting. It depends on the thickness d1 and width L1 of the central portion of the body 3, the radius of curvature r as the convex lens of the first light refracting body 3, the refractive index n of the material of the first light refracting body 3, and the like. Therefore, “the positional relationship between the LED 2 and the first light refracting body 3” in the present invention is an absolute condition that the thickness d1 and the width L1 of the first light refracting body 3 are substantially the same as the general-purpose fluorescent lamp. It is decided so that it can be taken (it fits inside well). 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. L1 depends on the refractive index of the first photorefractive body 3, but is preferably 3 to 15 mm, more preferably 4 to 10 mm, and particularly preferably 5 to 6 mm.

The relationship between the “radius of curvature and refractive index” and the actual focal length is expressed by the following equation (3).
f1 = 1 / [(n−1) (1 / r ₁ −1 / r ₂ )] (3)
Wherein (3), f1 is substantially the focal length of the first light refractor, n represents the inner and outer surfaces of the refractive index of the first light refractor, r ₁ and r ₂ are each as convex lenses of the first light refractor The radius of curvature. ]
In the present invention, it is essential that the distance a between the first light refractor and the “LED closest to the first light refractor” is shorter than the substantial focal length f1 of the first light refractor.

  The “angle α in FIG. 3” determined 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. 5 is an example of the above-described embodiment, and is a schematic view using both the first light refracting body 3 and the second light refracting body 13. A second photorefractive body group 14 made up of 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 photorefractive body 3, the LED 2 that looks like a linear light source looks like a surface light source, becomes less dazzling, and looks more like a general-purpose fluorescent lamp.

  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. . 5 to 7, 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 lighting fixture 1 of the present invention, the lighting fixture 1 is less likely to get dust and dirt and is easy to clean as shown in FIGS. A surface having its own radius of curvature is preferred.

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

  5 to 7, 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 achieved. 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 the second photorefractive body with respect to the number of LED columns is determined so as to achieve the effect of the present invention, but the number of the second photorefractive body with respect to one LED row is preferably 1 to 20, preferably 2 to 15. Is more preferable, and 2.5 to 10 is particularly preferable. 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 an alternative fluorescent lamp using the first and second photorefractive bodies>
FIGS. 5 to 7 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 outer dimensions as those of a general-purpose fluorescent lamp can be obtained (FIGS. 5 to 7). 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.

  FIGS. 5-7 is an example of the lighting fixture 1 of this invention which can be substituted for 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. 5 to 7, the second photorefractive body 13 is provided inside the outer tube 15. In FIG. 5, since the drawing is complicated, only two second light refracting bodies 13 are shown, but actually, a plurality of second light refracting bodies 13 are arranged in parallel from the left end to the right end. The outer tube 15 and the second photorefractive body 13 may be separate and in close contact with each other, or may be integrated, but 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. However, the front surface of the outer tube 15 is preferably colorless and transparent.

  As shown in FIGS. 5 to 7, 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 described above.

  5-7, the 2nd photorefractive body 13 is convex toward the inner side (LED side) of a 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 substantial 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 photorefractive body 13 are the same as those described in the location of the first photorefractive body 3, including the 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 (columnar 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 planar 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 a fluorescent lamp 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. 10, in the illuminance on the plane P existing at a distance of 1 m from the center M of the luminaire 1 in the light irradiation direction, the luminaire 1 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). That is, in the present invention, in FIG. 10, the illuminance at the point BL and the point BR on the plane P is preferably a luminaire that is 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. 10, the illuminance at a point H that is 1 m away from the central point M of the luminaire 1 in a direction perpendicular to the luminaire 1 in the light irradiation direction is the center of the luminaire 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, it is preferable that the illuminance at the point H on the plane 1 m away in FIG. 10 is 1/3 or more of the illuminance at the point H on the 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.

  Although the illuminance of the lighting fixture 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, the following is 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. 8) (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.

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

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

  EXAMPLES 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 unless it exceeds the gist.

Example 1
The lighting fixture 1 shown in FIGS. 3 and 4 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. 3 and 4, and a total of 288 LEDs 2 were used in each row. Further, as shown in FIG. 1, 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 made 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 curvature radius r of the inner surface (LED side surface) of the first photorefractive body 3 was 5 mm, and the curvature radius of the outer surface was equal to the curvature radius of the lighting fixture 1 itself. The angle α according to the above definition was 13 °. The number of first photorefractive bodies 3 was nine as shown in FIGS. 3 and 4, and the material was acrylic resin. The diameter of the luminaire was about 27 mm.

When applied to the following equation (3), which is the relationship between the “radius of curvature and refractive index” and the actual focal length,
f1 = 1 / [(n−1) (1 / r ₁ −1 / r ₂ )] (3)
Wherein (3), f1 is substantially the focal length of the first light refractor, n represents the inner and outer surfaces of the refractive index of the first light refractor, r ₁ and r ₂ are each as convex lenses of the first light refractor The radius of curvature. ]
Since r ₁ = 5 mm, r ₂ = 13.5 mm, and n = 1.49, f1 = 16.2 mm, and the LED could be placed inside the substantial focal length f1 of the first photorefractive body. That is, the distance a between the first light refracting body and “the LED closest to the first light refracting body” is set to a position shorter than the substantial focal length f1 of the first light refracting body.

  In this way, a lighting fixture adapted to a 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. 3, 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 fixture 1 shown in FIGS. 5 to 7 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 lighting fixture that is substantially the same as in the first embodiment and is 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.

  In this way, a lighting fixture adapted to a 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
A lighting fixture was obtained in the same manner as in Example 1 except that the first photorefractive body 3 was not provided in Example 1. 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. 10, 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 where the angle formed by the straight line L that passes through M at a right angle from the luminaire 1 and the plane P is 45 ° (BL and BR in FIG. 10), and 30 ° (AL and AR in FIG. 10), 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 ° (perpendicular line dropped from M to plane P) (H in FIG. 10).

  Moreover, from the point which left straight 0.5m from the left end of the lighting fixture 1, the perpendicular | vertical leg (H 'of FIG. 10) and the right end of the lighting fixture 1 were left straight 0.5m from the right end of the lighting fixture 1. From the point, the illuminance at the point of the foot of the perpendicular line (H ″ in FIG. 10) dropped on the plane P was also measured. The measurement of illuminance was performed according to a conventional method using Digital CC & CVDC power supply using an illuminometer Photo-2000 manufactured by Hangzhou Far Electronic Equipment Company.

  Table 1 shows the point in FIG. 10 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 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 of was 127/460 = 1 / 3.6 compared with the illuminance at the point of 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 of 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.

  Moreover, as shown in Tables 1-4, the result which showed the same tendency was obtained also at the point of +/- 30 degreeC instead of the point of +/- 45 degreeC. 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. 10 where the illuminance was measured. The evaluation results are shown in Table 6 together with the results of 1.0 m.

Reference example 2
Except for 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 Table 7, in the lighting fixture A of the present invention, the distance between the point M and the plane P is 0. 0 as in Example 3 where the distance between the point M and the plane P is 1.0 m. Even in the range of 5 m to 3.0 m, the values of BL / H, BR / H, AL / H, and AR / H are sufficiently large, and the illuminance does not decrease much even at points that are angularly shifted from the irradiation direction. Even if it falls, it is almost the same way 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.

  Moreover, in the lighting fixture A of this invention, even if it left | separated 3.0 m from the lighting fixture, it turned out that an illumination intensity does not decrease so much and it is substantially the same as a general purpose fluorescent lamp.

Comparative Example 3
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) ) Was measured in the same manner as the illuminance of 1 m), 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 distant point.

Comparative Example 4
A luminaire R having a positional relationship in which the distance a between the first light refracting body and the “LED closest to the first light refracting body” is longer than the substantial focal length f1 of the first light refracting body is prototyped, and the angle 0 The illuminance (Lux) at ° (just below) was measured. That is, a lighting fixture R having a sufficiently small radius of curvature of the inner surface of the first photorefractive body was produced, and the illuminance (Lux) at an angle of 0 ° (directly below) was measured. The results are shown in Table 8.

  Illuminance (Lux) at an angle of 0 ° (directly below) and the angle of 0 ° (directly below) of the comparative example 3 of the luminaire A having the first photorefractive body already described in Table 6 of Example 4 above. The illuminance (Lux) of) is also shown in Table 8 below.

  In Table 8, the upper part shows the illuminance (Lux) at a position that is a predetermined distance directly below the lighting fixture, and the lower part divides the illuminance at each distance by the illuminance (Lux) at a distance of 0.5 m. Indicates the value (corresponding to the rate of decrease in illuminance when moving away from the luminaire).

  According to Table 8, the illuminating device R in which the LED is outside the focal point of the first photorefractive body has a lower illuminance at a location farther away than the illuminating devices Q of Comparative Examples 1 to 3 having no first photorefractive body. The degree of was great. In other words, it is considered that a strip-like protrusion having a semicircular cross section having a small radius of curvature causes a decrease in illuminance at a remote location. Therefore, compared with the luminaire A of Examples 1, 3, and 4 in which the LED is inside the substantial focal point of the first photorefractive body, the illumination intensity at a distant place is far inferior.

Example 5
The distance between the point M and the plane P was 0.5 m to 3 when evaluated in the same manner as in Example 3 and Example 4 except that the lighting fixture B used in Example 2 was used instead of the lighting fixture A. 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. .

  Moreover, even if it was 3.0 m away from the lighting fixture B, the decrease in illuminance was even smaller than that of the lighting fixture A, almost the same as that of a general-purpose fluorescent lamp, and it was almost the same as that of a 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.

1 Lighting equipment 2 LED
2 ′ Schematic arrow indicating size and position of LED 2 ″ Schematic arrow indicating LED image (virtual image in FIG. 8, real image in FIG. 9) 3 First photorefractive body 4 First photorefractive body group 5 Inner tube 6 LED installation plate 8 Wiring space 13 2nd photorefractive body 14 2nd photorefractive body group 15 Outer tube 21 Pin d1 Thickness of center part of 1st photorefractive body L1 Width of 1st photorefractive body d2 2nd photorefractive body L2 The width of the second photorefractive body α [180 ° − (the 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

Claims (7)

  An elongated first photorefractive body, which is a cylindrical lens having a cross section of a convex lens, is provided on at least the front surface of the LED group, the inner tube having an LED group having a plurality of LEDs juxtaposed on the LED installation plate. The distance between the first light refracting body and the LED closest to the first light refracting body is integrally or inside the inner tube, closely adjacent to each other in the axial direction of the inner tube, The LED group has a distance shorter than the actual focal length of the first photorefractive body, and the LED group includes 20 to 800 LEDs per 1198 mm juxtaposed on an LED installation plate. An illuminating device that is juxtaposed so as to obtain the same outer dimensions as a tube fluorescent lamp and has substantially the same outer dimensions as a general-purpose straight tube fluorescent lamp.   A plurality of elongated second light refractors, which are cylindrical lenses, are arranged in parallel at least on the front surface of the LED group, outside the first light refractor, and substantially perpendicular to the first light refractor. The lighting fixture of Claim 1 which has.   3. The illumination according to claim 1, wherein three to 20 first photorefractive bodies elongated in the longitudinal direction of the lighting fixture are arranged in parallel in the longitudinal direction perpendicular to the longitudinal direction in the irradiation region of the LED. Instruments.   The luminaire according to claim 1 or 3, further comprising an inner tube integrated with the first photorefractive body on the outermost side.   The lighting fixture according to claim 2 or 3, further comprising an outer tube integrated with the second photorefractive body on the outermost side.   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 illuminance at a point where the angle is 45 ° is ¼ or more of the illuminance at a point where the angle formed by the straight line passing through the center of the luminaire and the plane is 90 °. The lighting fixture of description.   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 any one of claims 1 to 6, wherein the illuminance is 1/3 or more of the illuminance at a point 0.5 m away in a direction to be measured.

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