KR101350239B1 - Glass composition for diffuser of led lamp, diffuser of led lamp, and method for manufacturing the same - Google Patents

Abstract

The purpose of the present invention is to provide a glass composition capable of producing the diffuser made of glass without an additional heat sink made of metal materials, deformation and discoloration due to light and heat and the reduction of intensity and permeableness, a diffuser of an LED lamp using the same and a manufacturing method thereof. The glass composition for the diffuser of an LED lamp of the present invention is a glass composition obtained by melting raw glass and comprises 55-75 wt% of silicon dioxide (SiO2), 0.1-20 wt% of kalium oxide (K2O), 0.5-10 wt% of calcium oxide (CaO), 0.5-10 wt% of aluminum oxide (Al2O3), 1-5 wt% of phosphoric acid (P2O5), and 0.3-2 wt% of sulfur trioxide (SO3).

Description

Glass composition for LED light diffuser, LED light diffuser and manufacturing method thereof {GLASS COMPOSITION FOR DIFFUSER OF LED LAMP, DIFFUSER OF LED LAMP, AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a diffuser provided in the LED lamp for light diffusion, and more particularly, it is possible to effectively diffuse the light of the LED, but the heat and heat of the LED without deformation and discoloration, intensity and light transmittance deterioration due to light and heat The present invention relates to a glass composition capable of manufacturing an LED light diffuser that does not require a separate heat sink for emission, an LED light diffuser using the same, and a method of manufacturing the same.

In addition to lighting purposes that illuminate the darkness, lamps are used for various purposes such as decoration and visual display. In the past, filament-based lamps, such as incandescent and fluorescent lamps, were mainly used. Since these lamps emit a large part of the power consumed by heat, the energy used for actual lighting is only about 5 to 30% of the power used. The energy efficiency is very low, the service life is short.

Accordingly, recently, LED lamps using LEDs with low power consumption and long lifespan as light sources have been in the spotlight. Typically, LED lamps can reduce energy consumption by 1/5 or less than incandescent lamps and 1/3 or less than fluorescent lamps, and have a lifespan of more than 100 times compared to incandescent lamps and 10 times longer than fluorescent lamps. . LED lamps that are currently released as products are often manufactured in appearance similar to conventional lamps such as incandescent lamps or fluorescent lamps so that existing lighting fixtures can be used as they are. For example, fluorescent lamp type LED lamps are shown in FIG. have.

As shown in the drawing, the conventional LED lamp has a substrate 23 in which a plurality of LEDs 21 are arranged inside the main body 10, and the cover 30 covers the front side of the LED 21. It has a structure bonded to (10). Connection pins for supplying power to the LED 21 are provided at both sides of the main body 10 so that it can be used by connecting to the fluorescent light fixture in a manner similar to the conventional fluorescent light.

In general, since the LED is a point light source having a narrow irradiation angle, a diffuser for diffusing the light of the LED to a large area is required to prevent glare and to provide uniform illumination. For this reason, the cover 30 is made of a diffuser 30 made of a synthetic resin material having light diffusibility such as PC (Polycarbonate), not a simple light emitting material.

In addition, since LEDs are susceptible to heat and their performance drops sharply above a proper use temperature, a heat sink capable of rapidly dissipating heat generated when the LED is driven is required. Although heat resistance of LEDs is improved and operating heat is also reduced with the development of technology, heat sinks are necessary in the above-described conventional LED lamps because heat dissipation cannot be effectively performed through the diffuser 30 made of a resin material. . In addition, since the diffuser 30 itself is very susceptible to heat, the need for a heat sink is inevitably higher. Accordingly, the body 10 is made of a heat sink 10 made of metal such as aluminum.

As described above, the conventional LED lamp has a structure in which the synthetic resin diffuser 30 and the metal heat sink 10 are combined.

However, since the conventional LED light is made of a synthetic resin material in which the diffuser 30 is vulnerable to heat and light (especially ultraviolet rays), solar heat is irradiated by heat and light generated when the LED 21 is operated and depending on the installation environment. Deformation and discoloration, intensity and light transmittance decrease in the diffuser 30 due to heat and light applied from the light and surroundings, resulting in poor light quality and appearance of the product in a short period of time, resulting in poor durability and short service life. have.

In addition, since the structure of the conventional LED lamp described above must be manufactured and assembled separately from the heat sink 10 and the diffuser 30, in particular, it requires a metal heat sink 10, which requires a lot of material and processing cost, There is a problem of low productivity and high manufacturing cost.

Although not separately illustrated, other types of LED lamps, including bulbs, have the same problem as described above because they have a structure in which a metal heat sink and a synthetic resin diffuser are combined.

The present invention is to solve the problems described above, and can be given a variety of light diffusivity of the desired, there is no fear of deformation and discoloration, light intensity and light transmittance due to light and heat, LED diffuser material It is an object to provide a glass composition which can be usefully used.

In addition, the present invention provides a LED light diffuser made of a single member of a glass material surrounding the LED as a light source so as not to have a separate metal heat sink in the LED light using the glass composition and a method of manufacturing the same. There is a purpose.

Glass composition for LED light diffuser of the present invention for achieving the above object is a glass composition obtained by melting a glass raw material, in terms of oxide, 55 to 75% by weight of silicon dioxide (SiO ₂ ); 0.1-20% by weight of potassium oxide (K ₂ O); Calcium oxide (CaO) 0.5-10 wt%; 0.5-10% by weight of aluminum oxide (Al ₂ O ₃ ); Phosphoric acid (P ₂ O ₅ ) 1-5% by weight; And 0.3 to 2% by weight of sulfur trioxide (SO ₃ ).

The glass composition of the present invention described above, in terms of oxide, may further comprise 0.1 to 10% by weight of sodium oxide (Na ₂ O). In addition, boron trioxide (B ₂ O ₃ ) It may be configured to further comprise 0.1 to 17% by weight, may be configured to further comprise 0.1 to 10% by weight of magnesium oxide (MgO), fluorine (F) 0.1 to 5 It may be configured to further comprise a weight%.

Preferably, the glass composition may be obtained by cooling the molten glass to gradually lower the temperature, but slowly cooling to maintain for 0.5 to 4 hours in the temperature range of 800 ~ 1200 ℃.

In addition, the present invention provides an LED lamp diffuser manufactured by molding the glass composition in the form of a tube or bulb, and a method of manufacturing the same. .

According to the present invention configured as described above has the following effects.

(1) As a means for diffusing light of LED lamp, it is possible to manufacture diffuser of glass material without deformation and discoloration, intensity and light transmittance by light and heat, thereby improving durability and life of LED lamp, and improving appearance and lighting quality. Can be kept good for a long time.

(2) By providing a diffuser consisting of a single piece of glass material that does not require a separate heat sink for heat dissipation, it is possible to reduce the manufacturing cost of LED lamps and improve productivity.

1 is a perspective view showing a conventional LED lamp.
Figure 2 is a perspective view showing that applied to the fluorescent lamp type of light as one embodiment of the LED light diffuser according to the present invention.
3 is a cross-sectional view of the LED lamp shown in FIG.
Figure 4 is a perspective view showing that applied to the bulb-type light as another embodiment of the LED light diffuser according to the present invention.
5 is a graph showing the cooling rate after melting in the process of preparing a specimen of the glass composition for diffuser according to the present invention.
Figure 6 is a graph showing the light transmittance for the specimens of the glass composition for the diffuser according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

The following specific structures or functional descriptions are merely illustrated for the purpose of describing embodiments in accordance with the inventive concept, and embodiments according to the inventive concept may be embodied in various forms and may be described in detail herein. It should not be construed as limited to the examples.

Embodiments in accordance with the concepts of the present invention can be variously modified and have a variety of forms, specific embodiments will be illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

The terms first and / or second etc. may be used to describe various components, but the components are not limited to these terms. The terms may be named for the purpose of distinguishing one element from another, for example, without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, The second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when it is mentioned that an element is "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions for describing the relationship between components, such as "between" and "immediately between" or "adjacent to" and "directly adjacent to", should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. The terms "comprise" or "having" herein are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is practiced, and that one or more other features or numbers, It is to be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

FIG. 2 illustrates an embodiment in which the LED light diffuser according to the present invention is applied to a fluorescent lamp type light, and FIG. 3 is a lateral cross-sectional view of the LED light shown in FIG. 2.

As shown in Figures 2 and 3, the diffuser 111 of the present invention is formed in the shape of a long tube having a circular cross-sectional shape similar to the glass tube of a conventional fluorescent lamp. An LED 115 is disposed inside the diffuser 111 and a base 112 having a connection pin 113 is coupled to both longitudinal ends of the diffuser 111. The LED lamp 110 having an appearance similar to a fluorescent lamp ) Can be produced.

Like a conventional LED lamp, a plurality of LEDs 115 are mounted on the substrate 114 and connected to the connection pins 113 through the substrate 114. When the connection pin 113 is connected to a power terminal of a conventional lamp and power is supplied, the LED 115 emits light, and the light of each LED 115 is diffused while passing through the diffuser 111, . Further, heat generated in accordance with the operation of the LED 115 is emitted to the outside through the diffuser 111. A heat transfer medium 117 made of a common material having a high thermal conductivity such as metal or silicon may be provided between the back surface of the substrate 114 and the inner circumferential surface of the diffuser 111 for effective heat dissipation.

The shape of the diffuser 111 shown in the drawings is illustrative and various shapes such as a U-shape, an L-shape, a curved shape, and the like, which are connectable to one or both ends in addition to a linear shape, The diffuser 111 may be formed. In addition, the diffuser 121 may be formed in various bulb shapes to be used in the bulb type LED light 120 as shown in FIG. 4. The LED lamp of FIG. 4 also has a structure in which a base 122 for power connection is coupled to one side of a bulb type diffuser 121 and a plurality of LEDs 125 are arranged on the substrate 124 therein. In the following description, the reference numerals of the diffusers are denoted by 111 only.

The diffuser 111 is made of milky glass having light diffusivity. In particular, it is composed of the following glass composition so as to satisfy the physical and chemical properties required for the diffuser 111, including light transmittance, chromaticity, haze, heat resistance and strength.

[aggregate]

Silicon dioxide (SiO ₂ ): 55 ~ 75% by weight

[Fusion]

Potassium oxide (K ₂ O): 0.1 to 20% by weight

[Stabilizer]

Calcium Oxide (CaO): 0.5 ~ 10% by weight

[reinforcement]

Aluminum oxide (Al ₂ O ₃ ): 0.5 to 10% by weight

[Milky resin]

Phosphoric acid (P ₂ O ₅ ): 1 to 5% by weight

Defoaming material

Sulfur trioxide (SO ₃ ): 0.3 ~ 2% by weight

The above silicon dioxide (SiO ₂ ) is an aggregate constituting the main component of glass. If the content of SiO ₂ is less than 55% by weight, the strength and durability of the produced glass may be lowered. If the content of SiO ₂ is more than 75% by weight, the melting temperature of the glass material may be excessively increased, resulting in difficulty in the manufacturing process.

The potassium oxide (K ₂ O) functions as a melt to lower the melting temperature of the material. If the K ₂ O content is less than 0.1% by weight, the melting temperature of the material is increased, which increases the difficulty in the manufacturing process. If the K ₂ O content is more than 20% by weight, the melting temperature is lowered, but the strength and durability of the manufactured glass are lowered.

Alternatively, sodium oxide (Na ₂ O) or boron trioxide (B ₂ O ₃ ) may be added as a melting material. In this case, Na ₂ O and B ₂ O ₃ complementary together with K ₂ O as a molten material, Na ₂ O is included in the composition ratio of 0.1 to 10% by weight, B ₂ O ₃ 0.1 to 17% by weight It is desirable to be.

The calcium oxide (CaO) functions as a stabilizer to enhance the durability and moldability of the glass, and also functions as a fusing material to lower the melting point of the material. If the content of CaO is less than 0.5% by weight, the melting temperature of the material is excessively increased and durability and moldability are decreased. If the content of CaO is more than 10% by weight, the devitrification by crystallization increases.

Alternatively, magnesium oxide (MgO) may be added as a stabilizer. The MgO serves as a stabilizer and has a complementary function with CaO, and is preferably contained in a composition ratio of 0.1 to 10% by weight.

The aluminum oxide (Al ₂ O ₃ ) functions as a reinforcing material for improving durability and strength of glass. When Al ₂ O ₃ is included in less than 0.5% by weight, the mechanical properties, workability and chemical resistance of the glass is lowered, and when contained in more than 5% by weight, the melting temperature of the material is excessively increased.

The phosphoric acid (P ₂ O ₅ ) serves as a milky material that has a main function of imparting light diffusibility by opacifying glass. When less than 1% by weight of P ₂ O ₅ is contained, the milky property of the glass is reduced, and the light diffusivity is lowered. When it is contained more than 5% by weight, the light transmittance and water resistance of the glass are poor, and as a material of the electric light diffuser 111. Not suitable.

Alternatively, fluorine (F) may be added as a milky substance. The fluorine is a milky substance which functions complementarily to the phosphoric acid and is preferably contained in a composition ratio of 0.1 to 5% by weight.

The sulfur trioxide (SO ₃ ) functions as a defoaming material to remove the bubbles contained in the glass. When SO ₃ is contained in an amount less than 0.3% by weight, bubbles remain in the glass, and even when the amount of SO ₃ is excessive, the residual bubbles are increased.

A plurality of kinds of glass raw materials may be combined so as to satisfy the composition ranges as described above, and the combined glass raw materials may be put into a melting furnace and melted, followed by cooling and molding to produce glass diffusers 111 having various shapes and characteristics .

The glass raw material is melted at a temperature of about 1,500 to 1,600 DEG C, preferably about 1,550 DEG C for about 0.5 to 3 hours, preferably about 2 hours.

In order to increase the light diffusibility required as a diffuser, it is preferable that the molten glass raw material is slowly cooled for a sufficient time so that there is no rapid temperature drop. More specifically, the glass is slowly cooled for 0.5 to 10 hours, preferably 1 to 3 hours, so that the temperature is lowered at a melting temperature of glass of 20 占 폚 or less per minute, preferably 3 to 7 占 폚 per minute. Particularly, it is preferable that the temperature of the glass melt can be maintained in the range of 800 to 1200 DEG C for 0.5 to 4 hours. This slow cooling treatment can be achieved by a method in which the glass melt is kept in the melting furnace after the melting is completed and then cooled while adjusting the temperature.

When the glass melt is slowly cooled as described above, the temperature range (800 to 1200 ° C) in which the calcium phosphate crystal grains contained in the glass melt can uniformly grow is maintained for a sufficient time, The diffusibility can be improved.

[Experimental Example]

In order to obtain the glass composition of the present invention, the glass raw materials were combined at a composition ratio as shown in Table 1 below, and then melted at a temperature of 1550 ° C. for 2 hours to prepare a specimen by slowly cooling to room temperature in a state accommodated in a melting furnace. The temperature curve graph which shows the cooling rate at this time is shown in FIG.

The specimen obtained by slow cooling as described above was mirror polished to 0.3mm, 0.5mm, 0.7mm, 0.9mm by thickness, and then the light transmittance at all wavelengths was measured from the ultraviolet region to the visible and infrared region using a spectrophotometer. The measured results are shown in Table 2 below and in the graph of FIG. 6. As can be seen in the graphs of Table 2 and FIG. 6, the low wavelength transmittance of each specimen was 47.9 to 70.2% and the visible light transmittance was 42.3 to 63.8%, indicating light transmittance characteristics as translucent glass. As a result, the light transmittance gradually showed a clear tendency. This indicates that the milky property of the glass is very uniform, which is a very desirable result in that the required light transmittance value can be designed by adjusting the thickness of the glass.

On the other hand, in order to be used as a diffuser of the LED light, direct light from the light source should not be transmitted directly, so there should be no glare. That is, the glass exhibits a light transmittance of a predetermined value or more so that sufficient illuminance can be exerted, but it is preferable to have a high haze value so that diffused light can be transmitted instead of direct light. In order to confirm this required characteristic, Haze value, total transmittance, diffuse transmittance and parallel transmittance are measured on the same specimens using a Haze meter. Each characteristic value as shown in Table 3 was obtained. The turbidity meter used for the measurement was NDH 5000 instrument of 'NIPPON DENSOHKU' as a device to which haze and transmittance measuring method according to JIS K 7136 (ISO 14782) and JIS K 7361 (ISO 13468) were applied, The transmittance was measured using the wavelength value.

The Haze value is expressed by dividing the diffuse transmittance by the total transmittance and expressed as a percentage, and the higher the value, the more the scattered light by the diffuser plate is transmitted without direct light. Thus, the Haze value of 100% means that all the transmitted light is made by diffused light, which is highly desirable for a diffusion material for illumination. Parallel transmittance, on the other hand, is expressed as the total transmittance minus the diffuse transmittance, which means that the transmittance is due to direct sunlight. . As shown in Table 3, the Haze value of each specimen was 91.24 ~ 99.88% and the parallel light transmittance value of 0.06 ~ 5.95% showed very good optical characteristics as an illuminating diffuser. It was proved that a more preferred diffuser material was produced in that it exhibited a Haze value and a parallel light transmittance value of less than 1%. In addition, since Haze-related properties are constantly decreasing and increasing with the change in thickness of the glass, a very desirable result can be obtained in that the lighting optical characteristics can be designed according to the required characteristics.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

110, 120: LED light fixture
111, 121: diffuser
112, 122: base
114, 124: substrate
115, 125: LED

Claims (8)

As a glass composition obtained by melting a glass raw material, in oxide conversion,
55 to 75% by weight of silicon dioxide (SiO ₂ );
0.1-20% by weight of potassium oxide (K ₂ O);
Calcium oxide (CaO) 0.5-10 wt%;
0.5-10% by weight of aluminum oxide (Al ₂ O ₃ );
Phosphoric acid (P ₂ O ₅ ) 1-5% by weight; And
Sulfur trioxide (SO ₃ ) 0.3 ~ 2% by weight
Glass composition for LED light diffuser comprising a.
The method of claim 1,
Glass composition for LED light diffuser further comprises 0.1 to 10% by weight of sodium oxide (Na ₂ O) in terms of oxide.
The method of claim 1,
Glass composition for LED light diffuser further comprises 0.1 to 17% by weight of boron trioxide (B ₂ O ₃ ) in terms of oxide.
The method of claim 1,
Glass composition for LED light diffuser further comprises 0.1 to 10% by weight of magnesium oxide (MgO) in terms of oxide.
The method of claim 1,
Glass composition for LED light diffuser further comprising 0.1 to 5% by weight of fluorine (F).
The method according to any one of claims 1 to 5,
The molten glass is gradually cooled to lower the temperature, the glass composition for LED light diffuser, characterized in that the slow cooling to maintain for 0.5 to 4 hours in the temperature range of 800 ~ 1200 ℃.
LED light diffuser produced by molding the glass composition of claim 6 in the form of a tube or bulb.
The glass composition of any one of claims 1 to 5 is cooled to gradually lower the temperature in the molten state, but slowly cooled to maintain for 0.5 to 4 hours in the temperature range of 800 ~ 1200 ℃, tubular or bulb form LED light diffuser manufacturing method to be molded.

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