KR890003936B1 - Rear view mirror - Google Patents
Rear view mirror Download PDFInfo
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- KR890003936B1 KR890003936B1 KR1019860006318A KR860006318A KR890003936B1 KR 890003936 B1 KR890003936 B1 KR 890003936B1 KR 1019860006318 A KR1019860006318 A KR 1019860006318A KR 860006318 A KR860006318 A KR 860006318A KR 890003936 B1 KR890003936 B1 KR 890003936B1
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- liquid crystal
- mirror
- glass
- cholesteric
- rear view
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
- B60R1/02—Rear-view mirror arrangements
- B60R1/08—Rear-view mirror arrangements involving special optical features, e.g. avoiding blind spots, e.g. convex mirrors; Side-by-side associations of rear-view and other mirrors
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Mechanical Engineering (AREA)
- Liquid Crystal (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
제1도는 본 발명에 의하여 제조된 액정방현 거울의 실시예를 나타내는 단면도.1 is a cross-sectional view showing an embodiment of a liquid crystal display mirror manufactured by the present invention.
제2도는 전압을 인가하지 않았을 때의 동작설명도.2 is an operation explanatory diagram when no voltage is applied.
제3도는 전압을 인가하였을때의 동작 설명도이다.3 is an explanatory diagram of the operation when a voltage is applied.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 하우징 2 : 뒷면유리1 housing 2 back glass
3 : 거울면 4 : 앞면유리3: mirror surface 4: front glass
5 : 투명전극 6 : 배향막5 transparent electrode 6 alignment film
7 : 반사방지막 8 : 시일재7: antireflection film 8: sealing material
9 : 액정 10 : 광센서9 liquid crystal 10 light sensor
본 발명은 자동차등 차량에 있어서 백미러(Back mirror)등에 사용되는 액정을 이용한 방현(防眩)거울의 제작방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an antiglare mirror using liquid crystal used in a rearview mirror or the like in a vehicle such as an automobile.
종래에는 자동차에 있어서 뒤따라오는 자동자의 전조등에 따른 현란함을 방지하기 위하여 사율이 다른 두개의 반사면을 가진 프리즘 미러(Prism Mirror)등의 백미러를 사용하였다. 그러나, 이러한 방현거울의 경우, 방현이 필요 없을 때에는 고반사면으로 위치하도록 하고 또 방현이 필요할 때에는 저반사면으로 위치하도록 백미러의 각도를 변화시켜야 하는 번거로움이 있고, 도한 교반사면과 저반사면으로 변화시킬때 각도를 정확하게 하지 않으면 운전자에서 보이는 상이 흐트러져 버리는 문제점이 있다.Conventionally, in the automobile, a rearview mirror such as a prism mirror having two reflective surfaces having different slopes is used in order to prevent the glare caused by the headlights of the following vehicle. However, in the case of such antiglare mirrors, it is troublesome to change the angle of the rearview mirror so as to be located at a high reflection surface when no antiglare is needed, and to be at a low reflection surface when antiglare is required. If the angle is not correct, there is a problem that the image seen by the driver is disturbed.
위의 문제를 해결하기 위한 방법으로서 유리면의 저면에 액정소자를 배치하고 인가전압을 변화시켜서 액정의 배열을 바꿈에 따라 액정의 광투과율을 조절하여 유리면의 반사율을 제어하는 액정방현거울이 많이 제안 되어있다. 그러나 이러한 액정소자는 네마틱 액정 편광판을 이용하기 때문에 제조공정이 복잡하고 만들어진 액정의 방현효과는 기대 이하로 나타나고 있다.As a method for solving the above problems, many liquid crystal reflection mirrors are proposed to control the reflectance of the glass by adjusting the light transmittance of the liquid crystal according to the arrangement of the liquid crystal by arranging the liquid crystal element on the bottom of the glass surface and changing the applied voltage. have. However, since the liquid crystal device uses a nematic liquid crystal polarizing plate, the manufacturing process is complicated, and the anti-glare effect of the produced liquid crystal is less than expected.
액정을 이용한 방현거울을 대개가 정의 유전적 이방성을 갖거나 또는 부의 유전적 이방성을 갖는 콜레스테릭 또는 네마틱 액정물질을 포함하고 있으며, 이 액정물질이 전압변화에 따라 배열 변경이 될 수 잇게 기판의 내측면은 러빙처리에 의한 배향막이 형성되어야 한다.Anti-glare mirrors using liquid crystals usually contain cholesteric or nematic liquid crystal materials having positive dielectric anisotropy or negative dielectric anisotropy, and the liquid crystal material can be changed in arrangement according to voltage change. The inner side surface of the aligning film by rubbing treatment should be formed.
상기한 러빙처리는 통상 일정방향으로 행해지기 때문에, 이렇게 얻어지는 방현거울은 자연히 굴절각도가 일정 방향으로 한정되어져서 빛의 산란효과가 감소되는 것이다. 따라서 백미러에 사용할 경우,액정에 의한 방현 효과가 저조하여 그 실용화를 어렵게 하고 있다.Since the above rubbing treatment is usually carried out in a constant direction, the antiglare mirror thus obtained is naturally limited in the refraction angle in a certain direction to reduce the scattering effect of light. Therefore, when used in the rearview mirror, the anti-glare effect by the liquid crystal is low, making it difficult to use.
본 발명은 종래의 액정방현 거울의 결점을 해결한 액정방현 거울을 제공하는데 목적을 두고 있다.An object of the present invention is to provide a liquid crystal display mirror which solves the drawbacks of the conventional liquid crystal display mirror.
이하에 도면에 나타난 실시예를 기초로 두고 본 발명을 설명하기로 한다.Hereinafter, the present invention will be described based on the embodiments shown in the drawings.
제1도는 본 발명에 의하여 제작된 액정방현거울의 실시예를 나타내는 도면이다.1 is a view showing an embodiment of a liquid crystal display mirror produced by the present invention.
거울 하우징(Housing)(1)의 내면에는 표면에 Al, Cr, Ag등의 증착막(두께 3000옴스트롬)으로된 거울면(3)을 형성한 뒷면유리(2)가 배치되어 있고, 뒷면유리(2)의 전면에는 5-50μm정도의 간격을 두고 투명전극(5)이 증착되어 있는 앞면유리(4)가 위치하고 있으며, 뒷면유리(2)와 앞면유리(4)에 사이에 준비된 액정(9)이 넣어지고 시일재(8)로 봉입되어 있다.On the inner surface of the mirror housing (1), a rear glass (2) having a mirror surface (3) formed of a deposition film (thickness 3000 ohm stroms) such as Al, Cr, and Ag is disposed on the surface thereof, and the rear glass ( 2) the front glass (4) on which the transparent electrode (5) is deposited is located at the front of the 5-50μm interval, the liquid crystal (9) prepared between the rear glass (2) and the front glass (4) This is enclosed and sealed with the sealing material 8.
뒷면유리(2)와 앞면유리(4)의 표면에는 배향막(6)이 각각 형성되어 있다.The alignment film 6 is formed in the surface of the back glass 2 and the front glass 4, respectively.
본 실시예에서는, 상기한 액정(9)로서 콜레스테릭액정 97중량%에 카이랄네마틱 액정2중량%, 그리고, 네마틱 액정 1중량%를 첨가하여 만든 헬리칼 피치가 길고 유전 이방성이 네가티브인 콜레스테릭 액정을 이용하며, 배향막은 유기실란등으로 수직 배향처리된다. 배향처리에 있어서, 앞 , 뒷면 유리(4)(2)는 순수로 세정된 다음, 스피너로 유기실란을 도포하고, 110°-120℃로 30분간 열처리하여 행해진다. 여기서, 증착막의 거울면(3)은 거울의 역할을 하는 동시에 전극으로 사용된다. 그리고 앞면유리(4)의 표면에는 반사방지막(7)이 형성되어 유리표면의 반사에 따른 이중상을 방지한다.In the present embodiment, the helical pitch formed by adding 2 wt% of chiral nematic liquid crystals and 1 wt% of nematic liquid crystals to 97 wt% of cholesteric liquid crystals as the above-mentioned liquid crystal 9 has a long dielectric anisotropy and is negative. Phosphorus cholesteric liquid crystal is used, and the alignment film is vertically aligned with an organosilane or the like. In the alignment treatment, the front and rear glass 4, 2 are washed with pure water, then coated with an organosilane with a spinner, and heat-treated at 110 ° -120 ° C for 30 minutes. Here, the mirror surface 3 of the deposited film serves as a mirror and is used as an electrode. An anti-reflection film 7 is formed on the surface of the front glass 4 to prevent a double phase due to reflection of the glass surface.
이 반사방지막(7)은 MgF2를 약 800옹스트롬 정도 증착함으로서 이루어진다. 거울하우징(1)의 전면에는 입사광의 강도를 검출하는 광센서(10)가 부착되어 있다.This antireflection film 7 is formed by depositing about 800 Angstroms of MgF2. An optical sensor 10 for detecting the intensity of incident light is attached to the front surface of the mirror housing 1.
위와같이 제작된 액정방현거울은 전압이 인가되지 않은 상태에서는 제2도에 나타난 것처럼 액정(9)이 수직으로 배열되어 있어 입사하는 광(L)은 액정(9)에 의하여 흡수되지 않고 거울면(3)에 도달하여 반사하므로 방현거울의 반사율이 크게된다.In the liquid crystal display mirror manufactured as described above, the liquid crystal 9 is vertically arranged as shown in FIG. 2 in a state where no voltage is applied, so that the incident light L is not absorbed by the liquid crystal 9 and the mirror surface ( 3) Because it reaches and reflects, the reflectance of the antiglare mirror becomes large.
전원(E)을 인가하면 액정(9)이 상전이(Phase Change)를 하여 제3도에 도시된 바와같이 포컬코닉(Focal conic)조직으로 되어 입사되는 광선(L)이 액정(9)에 흡수되기 때문에, 종래의 방현거울과는 달리 빛의 산란현상이 없어서 완벽한 방현효과를 나타내게 된다.When the power source E is applied, the liquid crystal 9 undergoes phase change to form a focal conic structure, as shown in FIG. 3, so that the incident light beam L is absorbed by the liquid crystal 9. Therefore, unlike a conventional antiglare mirror, there is no light scattering phenomenon, thereby exhibiting a perfect antiglare effect.
본 발명은 이상에서 설명한 바와같이 액정(9)을 수직 배향처리 하였으므로, 전압을 인가하였을 때만 방현거울의 역할을 하도록하여 불필요한 전력소비를 막을 수 있고, 또한 액정(9)으로서 콜레스테릭 액정과 카이랄네마틱 액정을 네마틱액정에 첨가하여 혼합된 헬리칼피치가 길고 유전이방성이 네가티브인 콜레스테릭 액정을 이용하였기 때문에 상온에서도 물성의 변화가 없는 내구성이 뛰어난 액정방현 거울을 얻는 것이 가능하다. 또한 거울면(3)을 액정용의 전극으로서 공용이 가능하고 편광판이 불필요하므로 구조가 간단하게 되는 이점을 가지고 있다.In the present invention, since the liquid crystal 9 is vertically aligned as described above, the liquid crystal 9 can act as an antiglare mirror only when a voltage is applied, thereby preventing unnecessary power consumption, and the cholesteric liquid crystal and the car as the liquid crystal 9. Since a cholesteric liquid crystal having a long helical pitch and negative dielectric anisotropy was added by adding an irralnematic liquid crystal to the nematic liquid crystal, it is possible to obtain a durable liquid crystal display mirror having no change in physical properties even at room temperature. Moreover, since the mirror surface 3 can be shared as an electrode for liquid crystal and a polarizing plate is unnecessary, it has the advantage that a structure becomes simple.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019860006318A KR890003936B1 (en) | 1986-07-31 | 1986-07-31 | Rear view mirror |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1019860006318A KR890003936B1 (en) | 1986-07-31 | 1986-07-31 | Rear view mirror |
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KR880001470A KR880001470A (en) | 1988-04-23 |
KR890003936B1 true KR890003936B1 (en) | 1989-10-13 |
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KR1019860006318A KR890003936B1 (en) | 1986-07-31 | 1986-07-31 | Rear view mirror |
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KR100620240B1 (en) * | 2005-08-08 | 2006-09-06 | (주) 태양기전 | Rear-view mirror for vehicle |
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1986
- 1986-07-31 KR KR1019860006318A patent/KR890003936B1/en not_active IP Right Cessation
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