KR20100103002A - Illuminating cover and led illuminating lamp comprising the same - Google Patents

Abstract

PURPOSE: A light-transmissive unit and a light emitting diode(LED) illuminating lamp including the same are provided to reduce weight of the lamp by forming a rear covering unit with a resin instead of metal. CONSTITUTION: A light-transmissive unit(110) includes a rear covering unit(111) with an LED module combining unit(113) and a front covering unit(112). The front covering unit emits heat generated from an LED element toward the light radiating direction of the LED element. The rear covering unit emits heat generated from the LED element toward directions excluding the light radiating direction of the LED element. The LED module combining unit is formed on the inner lateral side of the rear covering unit.

Description

ILLUMINATING COVER AND LED DILLUMINATING LAMP COMPRISING THE SAME}

The present invention relates to a light-transmitting member and a LED lamp having the same designed to be easily integrated with a thermoplastic resin, and designed to perform heat dissipation smoothly without a heat sink of a metal.

Recently, attention has been paid to light emitting diodes (hereinafter, abbreviated as "LED elements") including semiconductor elements as light sources of various lighting devices. These LED devices have advantages such as low power consumption and long life compared to conventional lighting such as incandescent lamps. It is becoming.

However, when the LED element is deteriorated by the heat generated by the LED element which is a light source such as an LED lamp, there is a problem that the lifespan and illuminance of the LED lamp are significantly reduced.

In order to solve this problem, Korean Patent No. 0756897 (registered on September 3, 2007) is an aluminum substrate (LED) mounted inside a heat dissipation cover 10 and a cover lens 20, as shown in FIG. 30, an LED lamp having a heat pipe 40 coupled to an aluminum substrate 30 and a heat sink 50 coupled to the heat pipe 40 is disclosed. The document also relates to LED light emitting lamps that are suitable for further increasing the cooling and heat dissipation efficiency by forming a hole through which heat and air can enter and exit the heat dissipation cover.

However, the aluminum substrate 30, the heat pipe 40, and the heat sink 50 of the LED lamp are all made of aluminum that is metal, and holes (holes) are formed in the heat dissipation cover 10 to manufacture LED lamps. To do this, each part must be manufactured and screwed together. Therefore, the lighting is heavy by aluminum, the manufacturing process is cumbersome, and dust, pests, etc. may invade the hole of the heat dissipation cover.

In addition, Korean Patent No. 0643579 (registered on November 1, 2006) has a heat dissipation frame 80 made of an aluminum material coupled with a circuit board on which an LED element is mounted in a transparent tube 70 formed in a capsule shape. Disclosed is an LED lamp that radiates heat emitted from the LED element to the outside of the circuit board 60. In the above document, the heat emitted from the LED device is radiated to the outside of the circuit board to suppress the temperature rise inside the lamp, and the heat dissipation frame 80 is provided in the capsule-type transparent tube 70 to provide the transparent plate and the heat dissipation frame. It is intended to omit the process work to combine. However, since the heat radiated from the heat radiating frame 80 provided inside the capsule-shaped transparent tube 70 has no place to escape to the outside, the internal temperature of the lamp still rises. Therefore, the LED element of the lamp deteriorates, the lifespan of the LED lamp, the illuminance, etc. are lowered, and the lamp is heavy by the heat radiation frame 80 made of aluminum. In addition, even if the process of combining the capsular transparent tube and the heat dissipation frame is omitted, the manufacturing process is cumbersome because the capsular transparent tube and the heat dissipation frame must be manufactured respectively.

An object of the present invention is a simple structure, light dissipation of the heat generated from the LED element to the outside smoothly to suppress the temperature rise inside the lamp by suppressing the degradation of the LED device, to prevent the degradation of the lifetime of the LED lamp, lowering light transmittance To provide a member.

In addition, another object of the present invention is to provide a light-transmitting member which is lighter and simpler by using a resin instead of a metal conventionally used for heat dissipation.

In addition, another object of the present invention to provide an LED lamp provided with an LED module on the inner surface of the light transmitting member.

In order to achieve the above object, the translucent member of the present invention is a translucent member in which the front cover part and the rear cover part are integrally formed with a thermoplastic resin, and the rear cover part includes a heat conductive agent.

In addition, the present invention provides an LED lamp including a light transmitting member and an LED module.

The present invention uses a resin instead of a metal conventionally used as the rear cover of the translucent member, so that the weight is light and the front cover and the rear cover can be integrally formed by extrusion molding, thereby simplifying the manufacturing process and increasing productivity. have.

In addition, the light transmissive member includes a heat conduction agent in the rear cover to smoothly dissipate heat emitted from the LED element to the outside to suppress the temperature rise inside the lamp, thereby preventing deterioration of the LED element without a heat sink, and thus the life and illuminance of the LED lamp. The fall can be prevented.

In addition, in order to achieve a high level of heat dissipation, even if a heat sink is disposed inside to quickly dissipate heat emitted from the LED element to the outside, a heat conductive agent is included in the rear cover to effectively dissipate heat to the outside of the LED lamp. Can be done.

The present invention relates to a light-transmitting member and an LED lamp having the same, which can be simply manufactured in one piece of thermoplastic resin, and designed to perform heat dissipation smoothly without a heat sink of a metal.

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

The light transmissive member of the present invention is a light transmissive member in which the front cover portion and the rear cover portion are integrally formed of thermoplastic resin, and the rear cover portion includes a heat conductive agent.

Figure 3a is a perspective view of the light transmitting member according to a preferred embodiment of the present invention, Figure 3b is a cross-sectional view of the transparent member according to another embodiment of the present invention.

As shown in FIG. 3, the translucent member 110 of the present invention has a rear cover part 111 and a front cover part 112 having the LED module coupling part 113 formed integrally with thermoplastic resin, and the rear cover part. Reference numeral 111 includes a thermal conductive agent. At this time, if the position does not interfere with the light emitted from the LED device LED module coupling portion 113 may be located in the front cover portion (112).

At this time, the front cover portion 112 is a side from which light is emitted from the LED element. In addition, the rear cover part 111 radiates heat generated from the LED device to the outside, in which light is not emitted from the LED device.

LED module coupling portion 113 is provided on the inner side of the rear cover portion 111, the shape of the LED module coupling portion 113 is not particularly limited, but may be provided with an LED module, it is preferably formed as a projection or groove Do.

The rear cover part 111 is formed of a closed rear cover part 111 as shown in FIG. 3A using a thermoplastic resin instead of a metal such as aluminum that is conventionally used for heat dissipation.

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. In addition, in order to effectively exhibit heat dissipation, the heat dissipation fin may be configured to have a structure of heat dissipation fins, and to be in close contact with the LED module.

In addition, as shown in FIG. 3B, a thin portion 114 is formed as a whole on one end surface of the front cover portion 112, and the rear cover portion 111 is formed on the thin portion 114 of the front cover portion 112. It can be structured to be located. With the above structure, while maintaining the durability of the light transmitting member 110, it is possible to effectively transfer the heat emitted from the LED element to the outside. The thickness of the thin portion 114 of the front cover portion 112 is preferably 1/2 or less of the normal thickness, preferably 1/5 or less, and more preferably 1/10 or less.

In order to integrally form the rear cover part 111 and the front cover part 112 with a thermoplastic resin, all conventional methods used in the art may be used. Preferably, the translucent member 110 may be manufactured by extrusion molding. Can be. Among the extrusion moldings, double extrusion molding is more preferable in view of durability.

Double extrusion molding includes the steps of injecting the resin for the rear cover portion and the resin for the front cover portion, followed by melt kneading, laminating and cooling.

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

The translucent member 110 may use all conventional shapes used in the art, and specific examples thereof include a closed cross section, such as a circle, a square, a triangular shape, a trapezoidal shape, an octagonal shape, and a long tubular shape. Can be mentioned.

For example, the light transmissive member may be formed to have a long cross-section and a long tubular shape, and a cross section may have a rectangular shape and a long straight shape, such as a long cross section.

In addition, the light transmitting member 110 of the present invention has the advantage that does not need an additional member because it can diffuse the light by itself, and heat radiation.

The rear cover part 111 radiates heat generated by the LED to the outside, and includes a thermoplastic resin and a heat conductive agent for stable heat dissipation and smooth heat dissipation.

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 alkyl methacrylate, alkyl acrylate, cycloalkyl ester of methacrylic acid, cycloalkyl ester of acrylic acid, aryl methacrylate and aryl acrylate, 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.

As the heat conductive agent, ceramic powder or metal powder is preferable. In general, ceramic powders can expect thermal conductivity over a wide temperature range. The thermal conductive agent means a material that can easily release heat generated from the LED device to the outside.

As a specific example of such a ceramic powder, at least one of covalently bonded materials having a total valence electron number of 8 having a crystal structure of fibrous zinc type or cinnamonite type or a material having a hexagonal structure or graphite structure is used. The former covalent bond materials include diamond, c-BN, SiC, Be0, BP, AlN, and the like, and the latter hexagonal to graphite materials include hexagonal BN and graphite. Here, "total valence electron number" means the total electron number of the outermost electron number of each atom which comprises a compound, For example, it obtains as follows. Diamond (C-C); 4 + 4 = "8", c-BN; 3 + 5 = "8", SiC; 4 + 4 = "8", Be0; 2 + 6 = "8", BP; 3 + 5 = "8", AlN; 3 + 5 = "8"

Specific examples of such metal powders include aluminum hydroxide, aluminum oxide, zinc oxide, manganese oxide, silicon carbide, beryl oxide, aluminum nitride, silicon dioxide, titanium boride, boron nitride, silicon nitride, titanium dioxide, magnesium oxide, and nickel oxide. , Copper oxide, ferric oxide, or a combination of two or more thereof. Such ceramic powder or metal powder may have any particle shape, and examples thereof include a ball shape, a needle shape, a flake shape, and a star shape. The choice of shape can be appropriately determined by the rheology of the thermoplastic resin and the rheological properties of the composition.

The average particle diameter of a heat conductive agent is 0.5-250 micrometers normally, Preferably it is 1-100 micrometers, More preferably, it is 5-30 micrometers. The content of the heat conductive agent is 2 to 50 parts by weight, preferably 10 to 35 parts by weight based on 100 parts by weight of the thermoplastic resin. If the content is less than 2 parts by weight, the desired heat dissipation effect is not obtained, and if the content is more than 50 parts by weight, durability is lowered.

In addition, the rear cover portion 111 is 0.01 to 30 parts by weight based on 100 parts by weight of one or two or more selected from the group consisting of colorants, fillers, flame retardants, antioxidants, lubricants and impact modifiers such as pigments or dyes Preferably, 0.1 to 15 parts by weight may be further added.

In general, the thickness of the rear cover part 111 is preferably 0.5 to 2.0 mm, preferably 0.8 to 1.5 mm, in consideration of workability such as light weight, strength, handleability, and the like.

The front cover portion 112 is formed of a transparent or translucent using a thermoplastic resin, in order to diffuse the light of the LED element, includes a light diffusing agent. In addition, even when exposed to heat and a small amount of ultraviolet light (300 ~ 400nm) for a long time, it may be deformed and yellowed to include a UV absorber in order to prevent the problem that the transmittance, light diffusion rate, brightness is reduced and the color difference is changed. In addition, a heat conduction agent may be added to the front cover part 112 in addition to the rear cover part 111 to dissipate heat to the outside more smoothly.

The thermoplastic resin uses the same kind as the thermoplastic resin used for the rear cover part 111, and the resin of the front cover part 112 and the resin of the rear cover part 111 when manufacturing the light transmitting member by the double extrusion molding of the present invention. The same may be used or different resins may be used. For example, the same styrene resin may be used for the rear cover part 111 and the front cover part 112, or an acrylic resin may be used for the rear cover part 111, and a polycarbonate resin may be used for the front cover part 112. Can be. In addition, the same polycarbonate resin may be used for the compatibility of the rear cover part 111 and the front cover part 112 during the double extrusion molding.

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 particle diameter of the diffusion agent used is preferably 0.1 to 50㎛ size, the content is 0.01 to 40 parts by weight, preferably 0.05 to 10 parts by weight with respect to 100 parts by weight of the thermoplastic resin. In this case, when the content is less than 0.01 parts by weight, the incident light cannot be diffused, and when the content is more than 40 parts by weight, the transmittance of light 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 cover portion 112 may further include additives such as colorants such as pigments or dyes, light stabilizers, antioxidants or antistatic agents.

The thickness of the front cover part 112 thus constructed is generally 0.5 to 2.0 mm, preferably 0.8 to 1.5 mm, in consideration of workability such as light weight, strength, handleability, and the like. In this case, the thickness of the front cover part 112 may be the same as or different from the thickness of the rear cover part 111.

4 is a perspective view of a light transmitting member according to another embodiment of the present invention.

As shown in FIG. 4, the light transmissive member 110 is the same as FIG. 3A, except that the light transmissive member 110 illustrated in FIG. 3A is provided with a protrusion 115 such as a heat radiation fin on the rear cover 111. Is formed. At this time, the protrusion 115 may be formed on the outer surface of the rear cover portion 111 as shown in Figure 4a or the inner surface as shown in Figure 4b.

The protrusion 115 may increase the surface area of the rear cover 111 to more smoothly discharge heat generated from the LED device to the outside. At this time, the protrusions 115 are integrally formed of the same resin when the rear cover part 111 is manufactured.

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

As shown in Figure 5, the lamp 100 of the present invention is provided with an LED module 120 inside the translucent member 110, the rear cover portion 111 and the front cover portion 112 is integrally formed of a thermoplastic resin. do. In this case, the LED module 120 is a substrate or a base 122 on which a plurality of LED elements 121 are mounted, and is installed in the LED module coupling unit 113. Stabilizers, heat sinks, etc. which are installed as needed are not shown.

When the LED element 121 emits light, light is diffused through the front cover part 112 formed in front of the LED element 121, and heat generated is emitted to the outside through the rear cover part 111.

In addition, the cap 130 is installed on both ends of the lamp 100 with the LED module 120 to seal both ends of the lamp 100, and the LED element 121 transmits the current to receive the current. do.

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 it will be apparent to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention. It is natural that such variations and modifications 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

In order to manufacture resin for front cover part (A), 100 parts of styrene (HRM40, oriental styrene) which is a thermoplastic resin, 8 parts of acrylic particles which have an average particle diameter of 10 micrometers as a light diffusing agent, and 2, 4- dihydroxy benzo which are ultraviolet absorbers 1 part of phenone was mixed.

In addition, in order to manufacture resin (B) for a rear cover part, 100 parts of thermoplastic resin methyl methacrylate and 15 parts of aluminum oxides whose average particle diameter is 100 micrometers were mixed as a heat conductive agent.

The prepared front cover part resin (A) and the rear cover part resin (B) were respectively injected into a molding die and extruded, thereby manufacturing a light transmitting member in which the rear cover part and the front cover part were integrally formed as shown in FIG. 3A. At this time, the rear cover portion and the front cover portion were each made of 1.2 mm thick.

Example 2

In the same manner as in Example 1, except that the front cover portion is provided with a thin portion on one end of the cross section and formed as a whole, and double-extruded to position the rear cover portion on the thin portion to manufacture a light transmitting member as shown in FIG. 3B. At this time, the normal thickness of the front cover part was 1.2 mm, the thickness of the thin part 0.2 mm, the thickness of the rear cover part was manufactured to 1.0 mm.

At this time, it was confirmed that the durability of the light transmitting member provided with the thin portion was excellent.

Example 3

The same method as in Example 1 was carried out, except that the projections made of the resin for the rear cover part were added to the outer surface of the rear cover part to prepare a light transmitting member.

As described above, the light-transmitting member of the present invention is a light-transmitting member that prevents deterioration of the LED lamp by preventing the temperature rise inside the lamp with a simple structure and prevents a decrease in lifespan and a decrease in illuminance. Can be used as lighting.

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

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

3A is a perspective view of a light transmitting member according to a preferred embodiment of the present invention,

3B is a cross-sectional view of a translucent member according to another embodiment of the present invention;

4A is a perspective view of a light transmitting member according to still another embodiment of the present invention;

Figure 4b is a perspective view of the light transmitting member according to another embodiment of the present invention,

5 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: heat dissipation cover (conventional) 20: cover lens (conventional)

30: aluminum substrate (conventional) 40: heat pipe (conventional)

50: heat sink (conventional) 60: circuit board (conventional)

70: transparent capsule tube (conventional) 80: heat dissipation frame (conventional)

100: light 110: light transmitting member

111: rear cover portion 112: front cover portion

113: LED module coupling portion 114: thin section

115: projection 120: LED module

121: LED element 122: substrate or base

130: cap

Claims (9)

A translucent member in which the front cover portion and the rear cover portion are integrally formed with a thermoplastic resin, wherein the rear cover portion includes a heat conductive agent. The translucent member according to claim 1, wherein the thermal conductive agent is at least one selected from ceramic powder and metal powder. The light transmitting member according to claim 2, wherein the thermal conductive agent is included in an amount of 2 to 50 parts by weight based on 100 parts by weight of the resin. The resin of claim 1, wherein the resin of the front cover part or the rear cover part is 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. Translucent member more than a species. The translucent member according to claim 1, wherein the front cover part comprises 0.01 to 40 parts by weight of at least one diffusing agent selected from the group consisting of organic particles, inorganic particles and hollow particles with respect to 100 parts by weight of the resin. The translucent member according to claim 1, wherein the front cover portion and the rear cover portion are integrally formed by double extrusion. The translucent member according to claim 6, wherein the front cover part has a thin portion at one end face and is formed as a whole, and the rear cover part is positioned on the thin part of the front cover part. The translucent member according to claim 1, wherein a projection is formed on one surface selected from an inner surface and an outer surface of the rear cover portion. An LED lamp comprising a light transmitting member according to any one of claims 1 to 8 and an LED module.

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