KR20100103156A - Tubular illuminating cover with led board joining part and led illuminating lamp comprising the same - Google Patents

Abstract

PURPOSE: The tube shape light-transmissive member in which the LED substrate joint of multi-stage is included and LED lamp including the same obtains two kinds of photo effect by combining the LED substrate in the LED assembling substrate part of the multi level structure according to location. CONSTITUTION: The tube shape light-transmissive member comprises the rear cover part(111) and the front light-transmitting part(112) having the LED substrate joint(113). It is formed in the front of the LED element installed at the front light-transmitting part is the LED assembling substrate part. The LED assembling substrate part is formed in the side of the inside of the rear cover part into the multi level structure more than 2 shifts.

Description

TUBULAR ILLUMINATING COVER WITH LED BOARD JOINING PART AND LED ILLUMINATING LAMP COMPRISING THE SAME}

The present invention is a tubular light-transmitting member having a multi-stage LED substrate coupling portion showing two light effects (to make the shape of the LED light source visible or not visible through the front light transmitting portion) to the position where the LED substrate is fitted, and the LED lamp including the same It is about.

In general, the lighting is to convert the electrical energy into light energy to identify the object even in the dark, and in recent years has been used a lot to create an interior decoration or a cozy atmosphere. Such lamps are manufactured in various forms, and conventionally, lighting apparatuses using incandescent lamps or fluorescent lamps have been mainly used.

Incandescent lamps are inexpensive to manufacture, but they have been used recently because they generate a lot of heat in converting electrical energy into light energy. Fluorescent lamps consume less power due to higher energy conversion efficiency than incandescent lamps, but they require a lot of time during lighting. And short lifespan.

In order to solve this problem, a light emitting diode (hereinafter, abbreviated as "LED element") including a semiconductor element as a light source of various lighting apparatuses has been attracting attention in recent years. These LED devices have advantages such as low heat generation and long life compared to conventional lighting such as incandescent and fluorescent lamps. It is becoming.

Conventional LED lighting has been aimed to brighten a dark place, but in recent years, according to the aesthetic effect and the user's taste, LED lights that make or not visible through the light-emitting light source emitted from the LED element is required.

In the related art, as illustrated in FIG. 1, a plurality of grooves 2 in which the diffusion plate 1 is positioned are formed in the inside thereof, such that a distance between the fixed substrate 3 and the diffusion plate 1 can be adjusted. 10) has been proposed. However, the lamp 10 emits a diffused light source in which the shape of the light source is invisible no matter where the diffuser plate is located, and does not satisfy the requirement of making the LED light source visible or invisible in the lamp as long as it is recently required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tubular translucent member in which the shape of the LED light source is visible or not visible through the light transmitting portion depending on the position at which the LED substrate is fitted.

In addition, another object of the present invention is to provide an LED lamp including a tubular light transmitting member and an LED module, the LED substrate of the LED module can be fitted to the LED substrate coupling portion of the tubular light transmitting member by position.

In order to achieve the above object, the tubular light-transmitting member of the present invention is a tubular light-transmitting member formed integrally with a rear cover part having a front light transmitting portion and an LED substrate coupling portion, wherein the LED substrate coupling portion has a multi-stage structure of two or more stages. do.

In addition, the present invention includes a tubular light-transmitting member and the LED module, the LED substrate of the LED module is coupled to the bottom of the multi-stage structure of the LED substrate coupling portion of the tubular light-transmissive member LED lamp that the shape of the LED light source is identified when voltage is applied To provide.

In addition, the present invention includes a tubular light-transmitting member and the LED module, the LED substrate of the LED module is coupled to the upper end of the multi-stage structure of the LED substrate coupling portion of the tubular light-transmissive member LED does not identify the shape of the LED light source when voltage is applied Provide lighting.

The translucent member of the present invention may have two light effects (so that the shape of the LED light source is visible or invisible through the front light transmitting portion) by coupling the LED substrate to the LED substrate coupling portion formed in the multi-stage structure according to the position. That is, it is not necessary to change the structure of the LED lamp separately so that the shape of the LED light source is visible or invisible through the front light transmitting portion, and there is no need to manufacture a light source having different light transmittance and a light transmitting member having different light transmittance.

The present invention is a tubular light-transmitting member having a multi-stage LED substrate coupling portion showing two light effects (to make the shape of the LED light source visible or not visible through the front light transmitting portion) to the position where the LED substrate is fitted, and the LED lamp including the same It is about.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The tubular light transmissive member of the present invention is a tubular light transmissive member having a front cover portion and a rear cover portion having an LED substrate coupling portion integrally formed thereon, wherein the LED substrate coupling portion has a multistage structure of two or more stages.

Figure 2 is a perspective view of a tubular light transmitting member according to a preferred embodiment of the present invention, Figure 3 is a front view of a tubular light transmitting member according to a preferred embodiment of the present invention, Figure 4 is a perspective view of a tubular light transmitting member according to another embodiment of the present invention.

As shown in FIGS. 2 to 4, the tubular translucent member 110 of the present invention is integrally formed with the rear cover part 111 and the front transmissive part 112 provided with the LED substrate coupling part 113. At this time, the front light transmitting portion 112 is provided in front of the LED element 121 installed in the LED substrate coupling portion 113 is passed through the light source emitted from the LED element 121.

LED substrate coupling portion 113 is provided in a multi-stage structure of two or more stages on the inner side of the rear cover portion (111). The shape of the LED substrate coupling portion 113 is not particularly limited, but the LED substrate 122 may be provided. However, the LED substrate coupling portion 113 may be formed of a protrusion or a groove. At this time, the shape of the projections is not particularly limited, but if the cross-section is a shape that is protruding, such as trapezoidal, triangular, square, semicircular and can correspond to both the thickness and the width of the substrate, all of the usual shapes may be used. It is a triangle.

As shown in Figure 3, the projection of the LED substrate coupling portion 113 is 1 ~ 1.5mm long, the lower distance (α) between the projections is 0.8 ~ 1.3mm, preferably 0.9 ~ 1.1mm, the upper distance ((beta)) is 1.2-1.8 mm, Preferably it is 1.5-1.7 mm, and is formed in multistage structure. At this time, when formed as a groove instead of a projection may be formed so as to satisfy the distance between the projections 0.5 to 0.9mm long. In particular, when the cross section of the projection is trapezoidal or triangular, the distance between the projections varies from the upper distance β to the lower distance α. Accordingly, the LED substrate coupling unit 113 may have a thickness of 1.6 mm and a substrate having various thicknesses and widths as well as a conventional substrate having a width of 8 mm.

Here, the multi-stage structure of the LED substrate coupling portion 113 means that a plurality of protrusions or grooves are formed to be parallel to each other. At this time, when the LED substrate coupling portion 113 is a projection, three or more are formed to be parallel to each other, and in the case of a groove, two or more are formed to be parallel to each other.

In addition, the fixing means that the LED substrate 122 is inserted between the projections or the grooves of the LED substrate coupling portion 113 so that there is no left and right movement up and down even when shaken.

The multi-stage structure of the LED substrate coupling portion 113 is formed so as not to interfere with the LED light source emitted from the LED element 121 installed in the LED substrate coupling portion 113, all the LED light source emitted is the front light emitting portion 112 Can pass through

As shown in FIG. 3, the LED element 121 installed in the LED substrate coupling unit 113 emits an LED light source when a voltage is applied, and the emitted LED light source emits in a fan shape of 120 ° with respect to the light source. This is called the light diffusion range (a).

When the light source having the light diffusion range (a) passes through the front light transmitting portion 112, the shape of the LED light source may be visible or invisible depending on the position where the LED substrate 122 is fitted to the LED substrate coupling portion 113. . The front light transmitting portion 112 is preferably formed wider than the light diffusion range (a).

The rear cover part 111 may be formed of a closed rear cover part 111 as shown in FIG. 2 or an open rear cover part as shown in FIG. 4 by using a thermoplastic resin instead of a metal such as aluminum. It is possible to, preferably the closed rear cover portion 111.

At this time, the closed type is formed in a closed form without a part of the rear cover part 111, that is, a part of the rear cover part 111 is not opened so that the rear cover part 111 and the outside of the light transmitting member 110. It means to form a space to be blocked.

In addition, the closed back cover part 111 is not limited to a shape, If it is a closed form, such as a semi-circle, a V shape, and a dent, it can use all the usual shapes.

The open type means that a part of the rear cover part 111 is open and is formed so as not to be blocked from the outside of the light transmitting member 110 so that the inside of the light transmitting member 110 can be seen without interference from the outside.

In this case, the part of the rear cover part 111 is opened so that the rear part of the LED substrate coupling part 113 does not exist at a slightly open degree in which air can flow between the outside and the inside of the rear cover part 111. To the extent all possible.

In the tubular light transmitting member 110 of the present invention, the rear cover portion 111 and the front light transmitting portion 112 are integrally formed of a thermoplastic resin.

In order to integrally form the rear cover part 111 and the front light transmitting part 112, all conventional methods used in the art may be used. Preferably, the extrusion molding capable of simply manufacturing the light transmitting member 110 may be performed. It is a way.

The integral means that the rear cover part 111 and the front light transmitting part 112 are formed without an additional coupling member such as an adhesive or a screw.

The light transmissive member 110 may use all conventional shapes used in the art, and specific examples thereof include a closed or open cross section, such as a circle, a rectangle, a triangular shape, a trapezoidal shape, an octagonal shape, and a tubular shape. What is formed is mentioned.

The light transmissive member 110 is formed to be elongated, for example, a circular cross section and a long tubular shape, and a cross section is rectangular and elongated in the longitudinal direction, such as a long direct type.

The rear cover part 111 and the front light transmitting part 112 use thermoplastic resin to be integrally formed. In addition, the front light transmitting portion 112 is formed to be transparent or translucent by diffusing the light source emitted from the LED. In addition, even if exposed to heat and a small amount of ultraviolet light (300 ~ 400nm) for a long time deformed and yellowed to include a light diffusing agent, ultraviolet absorber in order to prevent the problem that the transmittance, light diffusion rate, brightness is reduced and the color difference is changed.

The thermoplastic resin may use all conventional resins used in the art, and in particular, it is preferable to have excellent transparency or translucency, light transmittance, durability, thermal stability, and the like. For example, an acrylic resin, a styrene-acrylic copolymer resin, Resin selected from styrene resin, styrene-acrylonitrile resin, polycarbonate resin, and olefin resin can be used individually or 2 types or more.

As said acrylic resin, Methacrylic acid alkyl ester, such as methyl methacrylate, ethyl methacrylate, butyl methacrylate, and 2-ethylhexyl methacrylate; Alkyl acrylates such as methyl acrylate, ethyl acrylate and butyl acrylate; Methacrylic acid cycloalkyl esters such as cyclohexyl methacrylate, 2-methylcyclohexyl methacrylate and dicyclopentanyl methacrylate; Acrylic acid cycloalkyl esters such as cyclohexyl acrylate and 2-methylcyclohexyl acrylate; Methacrylic acid aryl esters such as phenyl methacrylate and benzyl methacrylate; And any homopolymer or copolymer thereof selected from acrylic acid aryl esters such as phenyl acrylate and benzyl acrylate.

As the styrene-acrylic copolymer resin, one or two or more selected from methacrylic acid alkyl ester, acrylic acid alkyl ester, methacrylic acid cycloalkyl ester, acrylic acid cycloalkyl ester, methacrylic acid aryl ester and acrylic acid aryl ester and styrene and one or two or more copolymers selected from α-methylstyrene, m-methylstyrene, p-methylstyrene, and p-methoxystyrene.

Examples of the styrene resins include any one homopolymer or a copolymer thereof selected from styrene, α-methylstyrene, m-methylstyrene, p-methylstyrene, and p-methoxystyrene.

As the styrene-acrylonitrile copolymer resin, one or two or more selected from styrene, α-methyl styrene, m-methyl styrene, p-methyl styrene and p-methoxy styrene and an acrylonitrile monomer Coalescence is mentioned.

The polycarbonate resin may be a linear and branched aromatic polycarbonate homopolymer, a polyester copolymer or a mixture of one or more thereof prepared by reacting dihydroxy phenol with phosgene or by reaction of dihydroxy phenol with a carbonate precursor. A group consisting of:

The olefin resin may include one or two or more copolymers selected from polyethylene, polypropylene, and polyisobutylene.

The light diffusing agent exerts an excellent light diffusing effect, and all of the conventional light diffusing agents used in the art may be used, and in particular, organic particles, inorganic particles, or hollow particles may be used alone or in combination. Specifically, for example, silicon-based, acrylic-based, styrene-based, methyl methacrylate-styrene copolymer-based, polycarbonate-based, olefin-based crosslinked or uncrosslinked fine particles, silica, talc, calcium carbonate, barium sulfate, titanium dioxide (TiO ₂ ), One or two or more types selected from glass can be used in combination.

The content of the light diffusing agent is 0.01 to 40 parts by weight, preferably 0.05 to 10 parts by weight based on 100 parts by weight of the thermoplastic resin. In this case, when the content is less than 0.01 part by weight, the incident light source cannot be diffused, and when the content is more than 40 parts by weight, the transmittance of the light source is lowered and high luminance cannot be exhibited.

The ultraviolet absorber absorbs light in the 300-400 nm ultraviolet region emitted from the light source. The aviation absorbing agent may use all conventional ultraviolet absorbers used in the art, specifically, for example, organometallic; Cyanoacrylic type; Salicylate system; Oxalanilide system; Diketone system; 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2,2 ' Benzophenones such as dihydroxy-4-methoxybenzophenone; 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- ( 3,5-di-t-butyl-2-hydroxyphenyl) benzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole, 2- (3-t-butyl- 5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3, Benzotriazoles such as 5-di-t-amyl-2-hydroxyphenyl) benzotriazole and 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole; Malonic esters such as dimethylmalonate, diethylmalonate, dibenzyl malonate, and diallyl malonate; N- (4-ethoxycarbonylphenyl) -N-methyl-N-phenylformamidine, N, N-bis (4-ethoxycarbonylphenyl) -N-benzylformamidine, N-3,5 -Di-t-butyl-4-hydroxybenzyl-N'-4-ethoxycarbonylphenyl-N-phenylformamidine, N, N-bis (4-ethoxycarbonylphenyl) -N-3, 5-di-t-butyl-4-hydroxybenzylformamidine, N-4-butoxycarbonylphenyl-N'-4-ethoxycarbonylphenyl-N-3,5-di-t-butyl- Ultraviolet absorbers, such as formamidine system, such as 4-hydroxybenzylformamidine, can be used individually or in combination of 2 or more types. In particular, in consideration of ultraviolet absorption or thermal stability, a benzophenone series, a benzotriazole series or a malonic acid ester series are preferable.

At this time, the content of the ultraviolet absorber is 0.001 to 50 parts by weight, preferably 0.005 to 20 parts by weight based on 100 parts by weight of the thermoplastic resin. If the content is less than 0.001 parts by weight, it is disadvantageous to ultraviolet absorption and thermal stability, and if the content is more than 50 parts by weight, it is disadvantageous to light transmission.

In addition, the front light transmitting portion 112 may further include additives such as light stabilizer, antioxidant, antistatic agent, the content of the additive is 0.01 to 20 parts by weight based on 100 parts by weight of the thermoplastic resin.

The thickness of the front light transmitting part 112 and the rear cover part 111 is generally 1.0 to 1.6 mm, preferably 1.2 to 1.5 mm, respectively, in consideration of workability such as strength and handleability.

The total light transmittance of the front light transmitting portion 112 is 50.0 to 70.0%, preferably 55.0 to 60.0%. Further, the light diffusion rate is 58.0 to 72.0%, preferably 60.0 to 70.0%. In addition, the yellowing is 1.0 ~ 1.50 ㅿ YI, preferably 1.20 ~ 1.49 ㅿ YI.

5 is a view showing a light source image of a light transmitting member according to a preferred embodiment of the present invention.

As shown in FIG. 5, the tubular translucent member 110 is the same as that of FIG. 3, and the shape of the LED light source is the front floodlight 112 according to the position where the LED substrate 122 is fitted to the LED substrate coupling part 113. To be shown or not shown. In this case, the position at which the LED substrate 122 is inserted may also be selected according to the total light transmittance of the front light transmitting part 112.

The LED light source image may vary according to the distance between the front light transmitting part 112 and the LED substrate 122, and the distance may be represented by a length ratio d / D. In this case, the length ratio d / D means the distance d between the front light transmitting portion and the LED substrate with respect to the diameter D of the light transmitting member. That is, the length ratio d / D is 0.8 when the distance d of the front light transmitting portion and the LED substrate is 8 mm when the diameter D of the light transmitting member is 10 mm.

At this time, when the length ratio (d / D) is 0.5 or less, that is, when the LED substrate 122 is coupled to the lower end of the multi-stage structure of the LED substrate coupling portion 113, as shown in Figure 5a through the LED light source 112 If the shape is shown, the length ratio (d / D) is more than 0.5, that is, when the LED substrate 122 is coupled to the upper end of the multi-stage structure of the LED substrate coupling portion 113 as shown in Figure 5b Through 112, the shape of the LED light source is not shown. FIG. 5 illustrates the LED substrate coupling unit 113 having a three-stage structure, but is not limited thereto. The LED substrate 112 may be positioned at a position satisfying the length ratio d / D in a two-stage or four-stage structure. Once fitted, it exhibits one of two light effects.

6 is a perspective view of a lamp according to a preferred embodiment of the present invention.

As shown in Figure 6, the lamp 100 of the present invention is provided with an LED module 120 inside the translucent member 110 is formed integrally with the rear cover portion 111 and the front light transmitting portion 112. In this case, the LED module 120 is an LED substrate 122 on which a plurality of LED elements 121 are mounted, and is installed in the LED substrate coupling unit 113.

When a voltage is applied and the LED element 121 emits a light source, the light source passes through the front light transmitting part 112 formed in front of the LED element 121.

The cap 130 is additionally installed at both ends of the lamp 100 provided with the LED module 120 to seal both ends of the lamp 100, and transmits current so that the LED element 121 may receive a current.

Hereinafter, preferred examples are provided to aid the understanding of the present invention, but the following examples are merely for exemplifying the present invention, and various changes and modifications within the scope and spirit of the present invention are apparent to those skilled in the art. Naturally, such modifications and variations fall within the scope of the appended claims.

In the following Examples and Comparative Examples, "%" and "parts" indicating contents are by weight unless otherwise specified.

Example 1

To prepare the resin for the front light-transmitting part (A), 100 parts of styrene (HRM40, Dongyang Styrene), a thermoplastic resin, 7 parts of silica as an optical acid agent, 1 part of 2,4-dihydroxyphenone as an ultraviolet absorber, and triphenyl as an antioxidant One part of phosphite was mixed.

Further, resin (B) for the rear cover part was prepared from 100 parts of thermoplastic resin methyl methacrylate.

The front transparent part resin (A) and the rear cover part resin (B) are extruded at 200 to 260 ° C., and the front transparent part and the rear cover part each having a thickness of 1.5 mm are integrally formed, and three projections are provided. A closed translucent member having a multi-stage structure LED substrate coupling portion was manufactured.

Thereafter, an LED substrate was installed at the LED substrate coupling portion of the light transmitting member, wherein the length ratio (d / D) was 0.6, the light source was 11W, the light efficiency was 110lm / W, and the color temperature was 5168K.

Example 2

The same method as in Example 1 was carried out, but the LED substrate was installed such that the length ratio (d / D) was 0.5 to the LED substrate coupling portion of the manufactured light transmitting member.

Example 3

A light transmitting member was manufactured in the same manner as in Example 1 except that 15 parts of silica, a light diffusing agent, was used.

Test Example

The physical properties of the light transmitting members prepared in Examples and Comparative Examples were measured by the following method, and the results are shown in Table 1 below.

  (1) Total light transmittance (%)

Each of the prepared samples were processed by 60x60mm 5 each and stored for 24 hours at constant temperature and humidity (25 ℃, 50% Rh) and then measured using a haze meter (HRM-150, Murakami).

(2) image

After mounting the LED module to the prepared light transmitting member, the image of the light source seen through the front light transmitting unit was visually observed and evaluated based on the following criteria.

○: implemented so that the shape of the light source is visible.

X: It is implemented so that the shape of a light source may not be seen.

Example 1 Example 2 Example 3 Length ratio (d / D) 0.6 0.5 0.6 Total light transmittance (%) 56 56 65 image × ○ ○

As shown in Table 1, Example 1 of the present invention shows that the shape of the light source is not visible as shown in Figure 5 (b), Example 2 and Example 3 is the shape of the light source as shown in Figure 5 (a) It was confirmed that this was shown. It was confirmed that the light transmitting member of the present invention can exhibit two light effects by adjusting the position of the LED substrate.

As described above, the light transmissive member of the present invention is a light transmissive member that can represent a point light source and a surface light source, and can be used as various lights such as a signboard light or a building interior light.

1 is a perspective view of a lamp according to a conventional embodiment,

2 is a perspective view of a tubular light transmitting member according to a preferred embodiment of the present invention,

3 is a front view of a tubular translucent member according to a preferred embodiment of the present invention,

4 is a perspective view of a tubular translucent member according to another embodiment of the invention.

5 is a view showing a light source image of a light transmitting member according to a preferred embodiment of the present invention,

6 is a perspective view of a lamp according to a preferred embodiment of the present invention.

** Description of the major symbols in the drawings **

10: Lamp (conventional) 1: Diffusion plate (conventional)

2: groove (conventional) 3: substrate (conventional)

100: light 110: tubular light transmitting member

111: rear cover portion 112: front light transmitting portion

113: LED substrate coupling portion 120: LED module

121: LED element 122: LED substrate

130: cap

Claims (14)

Front floodlight; And a tubular translucent member integrally formed with a rear cover portion having an LED substrate coupling portion, wherein the LED substrate coupling portion has a multi-stage structure of two or more stages. The member of claim 1, wherein the multi-stage structure is configured to allow the LED substrate to be fitted at positions where the shape of the LED light source can be identified through the front light transmitting portion and positions where the shape of the LED light source is not. The member according to claim 1, wherein the length ratio (d / D) of the distance between the front light transmitting portion and the LED substrate to the tubular light transmitting member is 0.5 or less, and the shape of the LED light source is identified when voltage is applied. The member according to claim 1, wherein the length ratio (d / D) of the distance between the front light transmitting portion and the LED substrate to the tubular light transmitting member is greater than 0.5, and the shape of the LED light source is not identified upon application of voltage. The member of claim 1, wherein the multi-stage structure is formed such that light emitted from the LED light source passes through the front light transmitting part. The member of claim 1, wherein the front light transmitting part is configured to include a light diffusion range of the LED light source. A member according to claim 1, wherein the cross section of each stage is triangular, square, trapezoidal or semicircular. The member according to claim 1, wherein the total light transmittance of the front light transmitting portion is 50 to 60%. The method of claim 1, wherein the front light transmitting portion and the rear cover portion is at least one selected from the group consisting of an acrylic resin, a styrene-acrylic copolymer resin, a styrene resin, a styrene-acrylonitrile resin, a polycarbonate resin, and an olefin resin. absence. The member of claim 1, wherein the front light transmitting portion comprises a light diffusing agent selected from the group consisting of organic particles, inorganic particles, and hollow particles. The LED lamp including the tubular light-transmitting member and the LED module of claim 1, wherein the LED substrate of the LED module is coupled to the lower end of the multi-stage structure of the LED substrate coupling portion of the tubular light-transmissive member to identify the shape of the LED light source when voltage is applied. 12. The LED lamp of claim 11, wherein the lower end has a length ratio (d / D) of the distance between the front light transmitting portion and the LED substrate to the tubular light transmitting member not more than 0.5. The LED lamp including the tubular light-transmitting member and the LED module of claim 1, wherein the LED substrate of the LED module is coupled to the upper end of the multi-stage structure of the LED substrate coupling portion of the tubular light-transmissive member so that the shape of the LED light source is not identified when voltage is applied. The LED lamp according to claim 13, wherein the upper end has a length ratio (d / D) of the distance between the front light transmitting portion and the LED substrate to the tubular light transmitting member exceeding 0.5.

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