KR20060084055A - Fluorescent lamp for backlight - Google Patents

Fluorescent lamp for backlight Download PDF

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KR20060084055A
KR20060084055A KR1020050004317A KR20050004317A KR20060084055A KR 20060084055 A KR20060084055 A KR 20060084055A KR 1020050004317 A KR1020050004317 A KR 1020050004317A KR 20050004317 A KR20050004317 A KR 20050004317A KR 20060084055 A KR20060084055 A KR 20060084055A
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South Korea
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fluorescent lamp
glass tube
soldering
combination
electrode
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KR1020050004317A
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Korean (ko)
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KR100702600B1 (en
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전대선
우상구
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주식회사 단양솔텍
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65F—GATHERING OR REMOVAL OF DOMESTIC OR LIKE REFUSE
    • B65F1/00—Refuse receptacles; Accessories therefor
    • B65F1/14—Other constructional features; Accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65F—GATHERING OR REMOVAL OF DOMESTIC OR LIKE REFUSE
    • B65F1/00—Refuse receptacles; Accessories therefor
    • B65F1/14—Other constructional features; Accessories
    • B65F1/16—Lids or covers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/4204—Inspection openings or windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/64—Lids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65F—GATHERING OR REMOVAL OF DOMESTIC OR LIKE REFUSE
    • B65F1/00—Refuse receptacles; Accessories therefor
    • B65F1/14—Other constructional features; Accessories
    • B65F2001/1653—Constructional features of lids or covers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65F—GATHERING OR REMOVAL OF DOMESTIC OR LIKE REFUSE
    • B65F2240/00—Types of refuse collected
    • B65F2240/156—Paper

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

유리관의 적어도 일단의 외벽면에 끼워져 상기 일단에서 상기 유리관의 외벽면 일부가 노출되는 형상으로 형성되는 원통관 형상의 결합체와, 상기 결합체의 상기 일단에서 상기 유리관과 결합체가 함께 솔더링되어 형성되는 전극부를 포함하는 것을 특징으로 하는 형광램프.A cylindrical tube-shaped assembly inserted into at least one outer wall surface of the glass tube and formed in a shape in which a portion of the outer wall surface of the glass tube is exposed, and an electrode portion formed by soldering the glass tube and the assembly together at the one end of the assembly. Fluorescent lamp comprising a.

형광램프, 액정, LCD, 솔더, 전극, 유리관, 스프링, 그물망, 백라이트.Fluorescent lamp, liquid crystal, LCD, solder, electrode, glass tube, spring, mesh, backlight.

Description

백라이트 용 형광램프 {Fluorescent lamp for backlight}Fluorescent lamp for backlight {Fluorescent lamp for backlight}

도 1은 일반적인 디스플레이 장치를 도시한 분해 사시도이다.1 is an exploded perspective view illustrating a general display device.

도 2는 종래의 형광램프의 전극부를 도시한 단면도이다.2 is a cross-sectional view showing an electrode part of a conventional fluorescent lamp.

도 3은 본 발명에 따른 형광램프의 전극부를 도시한 단면도이다.3 is a cross-sectional view showing an electrode portion of a fluorescent lamp according to the present invention.

도 4와 도 5는 본 발명에 따른 형광램프의 결합체에 대한 다른 실시예를 도시한 사시도이다.4 and 5 are perspective views showing another embodiment of the combination of the fluorescent lamp according to the present invention.

도 6은 본 발명에 따른 형광램프의 결합체에 대한 변형 실시예를 도시한 단면도이다.6 is a cross-sectional view showing a modified embodiment of the combination of the fluorescent lamp according to the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

100 : 유리관 110 : 전극부100: glass tube 110: electrode part

112 : 솔더 114 : 스프링112: solder 114: spring

116 : 그물관 118 : 돌기116: net pipe 118: projection

본 발명은 백라이트 용 형광램프에 관한 것으로서, 더욱 상세하게는 전극 형 성을 위한 솔더링 작업 소요 시간이 감소되어 생산성이 향상된 백라이트 용 형광램프에 관한 것이다. The present invention relates to a fluorescent lamp for backlight, and more particularly, to a backlight fluorescent lamp for improved productivity by reducing the soldering time required for forming the electrode.

통상적으로, 평판표시장치(flat panel display)는 발광형과 수광형으로 분류되며, 발광형으로는 음극선관, 전계 발광(Electro Luminescent;EL) 소자, 플라즈마 디스플레이 패널(Plasma Display Panel;PDP) 등이 있고, 수광형으로는 액정 디스플레이(Liquid Crystal Display;LCD) 등이 있다.In general, a flat panel display is classified into a light emitting type and a light receiving type, and a light emitting type includes a cathode ray tube, an electroluminescent (EL) element, a plasma display panel (PDP), and the like. The light receiving type includes a liquid crystal display (LCD) and the like.

상기 수광형 표시장치는 그 자체가 발광하여 화상을 형성하지 못하고 외부로부터 빛을 받아 화상을 형성하게 되므로 별도의 광원, 예를 들면 백라이트를 설치하여 화상을 관찰할 수 있도록 하고 있다.The light-receiving display device itself emits light and does not form an image, but receives light from the outside to form an image, so that a separate light source, for example, a backlight, may be installed to observe the image.

상기 백라이트에 사용되는 형광램프로는 양끝 전극이 관내에 설치된 냉음극 형광램프(Cold Cathode Fluorescent Lamp;CCFL)와, 양끝 전극이 관외에 설치된 외부전극 형광램프(External Electrode Fluorescent Lamp;EEFL) 및 전극을 형성하지 않는 무전극 형광램프 등으로 구분된다.Fluorescent lamps used for the backlight include cold cathode fluorescent lamps (CCFLs) having electrodes at both ends, and external electrode fluorescent lamps (EEFL) and electrodes at both ends of the tube. And an electrodeless fluorescent lamp that does not form.

상기 전극의 형성 방식으로는 여러 가지가 있으나 그 중에서도 상기 형광램프의 양끝단을 초음파 솔더링 장치를 이용하여 솔더링 처리하는 방식이 있다.The electrode may be formed in various ways, and among them, both ends of the fluorescent lamp may be soldered using an ultrasonic soldering device.

도 1은 일반적인 디스플레이 장치를 도시한 분해 사시도이다.1 is an exploded perspective view illustrating a general display device.

일반적으로 액정 디스플레이 장치는 액정 디스플레이 패널(50)의 후면에 다수개의 형광램프(10)를 배열하여 발광시킴에 따라 사용자들이 디스플레이 패널(50)에 나타나는 화상을 식별할 수 있도록 구성된다.In general, the liquid crystal display device is configured to emit light by arranging a plurality of fluorescent lamps 10 on the back of the liquid crystal display panel 50 so that users can identify an image appearing on the display panel 50.

도 2는 종래의 외부전극 형광램프를 도시한 단면도이다.2 is a cross-sectional view showing a conventional external electrode fluorescent lamp.

종래의 형광램프(10) 외부 전극(40) 형성 방식의 일례로서, 초음파 솔더링 장치의 솔더 포트에 상기 형광램프(10)의 끝단을 담그고 솔더링 작업을 실시함에 따라 손쉬운 방법으로 저가로 형광램프(10)의 전극(40)을 형성하는 방식이 개시되었다.As an example of a conventional fluorescent lamp 10 external electrode 40 forming method, by immersing the end of the fluorescent lamp 10 in the solder port of the ultrasonic soldering device and performing a soldering operation, the fluorescent lamp 10 can be easily used at low cost. The method of forming the electrode 40 of the) has been disclosed.

도시된 바와 같이, 종래의 형광램프(10) 전극(40) 형성 방식은 내부에 형광 물질이 도포된 유리관(30)의 양 끝단 외주연 일부에 관 형상의 프로브(20)를 삽입하면, i) 상기 프로브(20) 외벽면과 ii) 유리관(30)의 외벽면 그리고 iii) 상기 프로브(20) 내벽면과 유리관(30)의 외벽면 사이의 틈과 iv) 형광램프(10) 양끝단 내부로 솔더가 침투되어 솔더링 됨에 따라 이루어지게 된다.As shown in the drawing, the conventional fluorescent lamp 10 electrode 40 is formed by inserting the tubular probe 20 into a portion of the outer periphery of both ends of the glass tube 30 coated with a fluorescent material therein, i) Iv) a gap between the outer wall surface of the probe 20 and ii) the outer wall surface of the glass tube 30, and iii) the inner wall surface of the probe 20 and the outer wall surface of the glass tube 30, and iv) into both ends of the fluorescent lamp 10. As the solder penetrates and solders, it is done.

이때, 상기와 같은 솔더링 과정은 대략 40~50초 사이에 이루어지며, 이와 같은 솔더링에 의한 전극(40) 형성은 초음파 에너지에 의해 유리의 산화막이 기계적으로 제거되어 금속화가 촉진되고, 유리 표면과 무연 솔더 사이에 있는 기포 또는 기공이 제거되어 생성되는 미세홈에 무연 솔더가 침투되어 충진되기 때문으로, 유리 및 세라믹의 주성분인 SiO2가 초음파에 의해 가진되면 Si+2O가 되어 옥시즌은 외부로 방출되고 Si와 무연 솔더의 성분이 결합됨으로써 이루어지게 된다.At this time, the soldering process as described above is performed between about 40 to 50 seconds, the formation of the electrode 40 by the soldering such that the oxide film of the glass is mechanically removed by ultrasonic energy to promote metallization, lead-free with the glass surface Lead-free solder penetrates and fills the microgrooves created by removing air bubbles or pores between the solder. When SiO 2, which is the main component of glass and ceramics, is excited by ultrasonic waves, oxygen is released to the outside. This is achieved by combining the components of Si and lead-free solder.

그러나, 상기와 같은 종래의 전극(40) 형성 방식은 비교적 장시간인 40~50초 정도의 시간이 소요되는 바, 대량 생산에 한계가 있어 근래에 많은 수요가 있는 LCD 장치의 백라이트 유닛을 제공하기 어렵다는 문제가 있다.However, the conventional method of forming the electrode 40 as described above takes a relatively long time of about 40 to 50 seconds, and there is a limitation in mass production, so it is difficult to provide a backlight unit of an LCD device having a high demand in recent years. there is a problem.

본 발명은 상기 전술한 문제점을 해소하기 위하여 안출된 것으로서, 전극 형성 시간이 단축되는 형광램프를 제공하는데 목적이 있다.The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a fluorescent lamp which shortens the electrode formation time.

아울러, 본 발명의 목적은 이상에서 언급된 목적에 국한되지 않으며, 언급되지 않은 또 다른 목적들은 아래의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.
In addition, the object of the present invention is not limited to the above-mentioned object, other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

전술한 목적을 달성하기 위한 본 발명에 의한 형광램프는 유리관의 적어도 일단의 외벽면에 끼워져 상기 일단에서 상기 유리관의 외벽면 일부가 노출되는 형상으로 형성되는 원통관 형상의 결합체와, 상기 결합체의 상기 일단에서 상기 유리관과 결합체가 함께 솔더링되어 형성되는 전극부를 포함하는 것을 특징으로 한다.Fluorescent lamp according to the present invention for achieving the above object is a cylindrical tube-shaped combination formed in the shape of being exposed to the outer wall surface of at least one end of the glass tube is exposed in the end portion of the glass tube, the said of the combination At one end, the glass tube and the combination is characterized in that it comprises an electrode formed by soldering together.

또한, 상기 결합체의 표면에는 복수개의 관통 구멍이 형성되는 것을 특징으로 한다.In addition, the surface of the combination is characterized in that a plurality of through holes are formed.

또한, 상기 결합체는 스프링 형상으로 형성되는 것을 특징으로 한다.In addition, the combination is characterized in that it is formed in a spring shape.

또한, 상기 결합체는 그물 형상으로 형성되는 것을 특징으로 한다.In addition, the combination is characterized in that it is formed in a net shape.

또한 상기 결합체는 유리관의 외벽면에 결합되도록 일부 단면이 축소된 것을 특징으로 한다.In addition, the combination is characterized in that some cross-section is reduced to be coupled to the outer wall surface of the glass tube.

이하, 첨부된 도면을 참조하여 본 발명에 따른 형광램프의 바람직한 실시예를 상세하게 설명하기로 한다.Hereinafter, exemplary embodiments of the fluorescent lamp according to the present invention will be described in detail with reference to the accompanying drawings.

도 3은 본 발명에 따른 형광램프의 전극부를 도시한 단면도이고, 도 4와 도 5는 본 발명에 따른 형광램프의 결합체에 대한 각각의 실시예를 도시한 사시도이다.Figure 3 is a cross-sectional view showing the electrode portion of the fluorescent lamp according to the present invention, Figures 4 and 5 are perspective views showing each embodiment of the combination of the fluorescent lamp according to the present invention.

본 발명에 따른 형광램프는 내부에 형광물질이 칠해진 유리관(100)의 적어도 일단, 바람직하게는 양단의 외벽면에 끼워져 상기 양단에서 상기 유리관(100)의 외벽면 일부가 노출되는 형상으로 형성되는 원통관 형상의 결합체와, 상기 결합체의 상기 양단에서 상기 유리관(100)과 결합체가 함께 초음파 솔더링 장치에 의해 솔더링되어 형성되는 전극부(110)를 포함한다.The fluorescent lamp according to the present invention is a circle formed in at least one end of the glass tube 100 coated with a fluorescent material therein, preferably inserted into an outer wall surface of both ends to expose a portion of the outer wall surface of the glass tube 100 at both ends. It includes a combination of a tubular shape, and the electrode portion 110 is formed by soldering together by the ultrasonic soldering apparatus in the glass tube 100 and the combination at both ends of the combination.

이때, 상기 결합체에는 유리관의 외벽면 일부가 노출되는 형상으로 형성되어 즉, 상기 결합체의 표면에는 관통 부분이 형성되어 많은 양의 솔더(112)가 유리관(100)과 접촉되도록 함이 바람직한 바, 이에 따라 상기 결합체를 도 4와 도 5에 도시된 바와 같은 스프링(114) 또는 그물망(116) 형태의 관으로 형성한다.In this case, the outer part of the outer surface of the glass tube is formed in a shape that is exposed, that is, the through portion is formed on the surface of the combination is a large amount of solder 112 is to be in contact with the glass tube 100, The combination is thus formed into a tube in the form of a spring 114 or a mesh 116 as shown in FIGS. 4 and 5.

원통관 형태로 이루어지는 종래의 프로브와 다르게 본 발명에 따른 결합체가관통 부분을 갖는 이유는 유리관(100)과 솔더(112) 사이의 열전달 특성을 향상시키고, 솔더링이 용이한 재질인 금속재질의 결합체와 유리관(100)을 함께 솔더링 함에 따라 땜성을 좋게 하여 빠른 솔더링 작업 시간을 갖도록 하기 위함이며, 유리관(100)과 솔더(112)가 더욱 많은 면적에서 접함에 의해 견고한 솔더링을 가능하게 하기 때문이다.Unlike the conventional probe having a cylindrical tube shape, the reason why the binder according to the present invention has a through portion is to improve heat transfer characteristics between the glass tube 100 and the solder 112 and to facilitate the soldering of the metal material and the binder. This is because the soldering of the glass tube 100 together improves the solderability to have a fast soldering operation time, and the glass tube 100 and the solder 112 are in contact with each other in a larger area, thereby enabling solid soldering.

본 발명에 따른 형광램프의 결합체를 이용하여 전극부(110)를 형성시킨 결과 솔더링 소요 시간은 대략 10초에서 20초 정도로 소요되었으며, 따라서 종래의 방식 에 비해 솔더링 소요 시간이 많이 줄어들었음을 확인할 수 있었다. As a result of forming the electrode unit 110 using the combination of the fluorescent lamp according to the present invention, the soldering time was about 10 seconds to about 20 seconds, and thus the soldering time was much reduced compared to the conventional method. there was.

도 6은 본 발명에 따른 형광램프의 결합체에 대한 변형 실시예를 도시한 단면도이다.6 is a cross-sectional view showing a modified embodiment of the combination of the fluorescent lamp according to the present invention.

상기 결합체는 표면에 다수의 관통 구멍(120)이 형성되고 유리관(100)의 외벽면에 결합되는 상태로 초음파 솔더링 장치의 솔더 포트에 담겨져 솔더링 작업이 실시된다. 이때, 솔더 포트에 담겨지기 전에 유리관(100)에서 이탈되거나 유동되어 솔더링되지 않는 유리관(100)의 다른 부위로 이동되지 않도록 유리관(100)에 끼워 맞춤될 수 있을 정도의 그물관(116) 직경 혹은 스프링(114) 직경을 갖는다.The assembly is a soldering operation is carried out in a plurality of through holes 120 are formed on the surface is contained in the solder port of the ultrasonic soldering device in a state that is coupled to the outer wall surface of the glass tube 100. At this time, the diameter of the net tube 116 enough to fit in the glass tube 100 so as not to move to another part of the glass tube 100 that is not soldered or separated from the glass tube 100 before being immersed in the solder pot or The spring 114 has a diameter.

즉, 본 발명에 따른 형광램프의 전극부(110)는 되도록 유리관(100)의 많은 부분에서 솔더링이 이루어지도록 하는 것이 유리하므로 유리관(100)과 결합체 사이에 많은 솔더(112)가 더 침투될 수 있도록 약간 이격시키고, 상기 결합체가 상기 유리관(100)에서 유동되지 않는 상태로 결합되도록 내부에 돌기(118)를 형성하는 등과 같은 방식으로 일부 단면을 축소하는 것이 바람직하다.That is, since the electrode portion 110 of the fluorescent lamp according to the present invention advantageously to be soldered to as much of the glass tube 100 as possible, many solders 112 may be further penetrated between the glass tube 100 and the assembly. Slightly spaced apart so as to reduce some cross section in such a way as to form projections 118 therein such that the assembly is coupled in a non-flowing state in the glass tube 100.

이와 같이 일부 단면이 축소된 구성은 도 4 및 도 5에 도시된 결합체에도 적용될 수 있음은 물론이다.Such a configuration in which some cross sections are reduced may be applied to the combination shown in FIGS. 4 and 5.

이상, 본 발명을 바람직한 실시예를 통하여 상세히 설명하였으나, 본 발명의 범위는 특정 실시예에 한정되는 것은 아니며, 첨부된 특허 청구범위에 의하여 해석되어야 할 것이다. 또한, 이 기술분야에서 통상의 지식을 습득한 자라면, 본 발명의 범위에서 벗어나지 않으면서도 많은 수정과 변형이 가능함을 이해하여야 할 것이다.As mentioned above, although this invention was demonstrated in detail through the preferable Example, the scope of the present invention is not limited to a specific Example, Comprising: It should be interpreted by the attached Claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

본 발명에 따른 형광램프는 유리관과 솔더 사이의 열전달 특성을 향상시키고, 솔더링이 용이한 재질인 금속재질의 결합체와 유리관을 함께 솔더링 함에 따라 땜성을 좋게 하여 빠른 솔더링 작업 소요 시간을 가지며, 유리관과 솔더가 더욱 많은 면적에서 접함에 의해 보다 견고한 솔더링이 가능하다는 장점이 있다.The fluorescent lamp according to the present invention improves heat transfer characteristics between the glass tube and the solder, and has a fast soldering time by improving the solderability by soldering the metal tube and the glass tube together, which are easy to solder, together with the glass tube and the solder. Has the advantage of more robust soldering by contacting in more areas.

Claims (5)

유리관의 적어도 일단의 외벽면에 끼워져 상기 일단에서 상기 유리관의 외벽면 일부가 노출되는 형상으로 형성되는 원통관 형상의 결합체와,A combination of a cylindrical tube shape that is inserted into at least one outer wall surface of the glass tube and is formed in such a manner that a portion of the outer wall surface of the glass tube is exposed at the one end; 상기 결합체의 상기 일단에서 상기 유리관과 결합체가 함께 솔더링되어 형성되는 전극부를 포함하는 것을 특징으로 하는 형광램프.And an electrode part formed by soldering the glass tube and the assembly together at the one end of the assembly. 청구항 1에 있어서,The method according to claim 1, 상기 결합체의 표면에는 복수개의 관통 구멍이 형성되는 것을 특징으로 하는 형광램프.Fluorescent lamp, characterized in that a plurality of through holes are formed on the surface of the assembly. 청구항 1에 있어서,The method according to claim 1, 상기 결합체는 스프링 형상으로 형성되는 것을 특징으로 하는 형광램프.The combination lamp is characterized in that the fluorescent lamp is formed. 청구항 1에 있어서,The method according to claim 1, 상기 결합체는 그물 형상으로 형성되는 것을 특징으로 하는 형광램프The combination lamp is characterized in that the fluorescent lamp is formed 청구항 1 내지 청구항 4 중 어느 한 항에 있어서,The method according to any one of claims 1 to 4, 상기 결합체는 유리관의 외벽면에 결합되도록 일부 단면이 축소된 것을 특징으로 하는 형광램프.The assembly is a fluorescent lamp, characterized in that the cross-section is reduced in part to be coupled to the outer wall surface of the glass tube.
KR1020050004317A 2005-01-17 2005-01-17 Fluorescent lamp for backlight KR100702600B1 (en)

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