TW424156B - Polarization converter - Google Patents

Polarization converter Download PDF

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Publication number
TW424156B
TW424156B TW88110188A TW88110188A TW424156B TW 424156 B TW424156 B TW 424156B TW 88110188 A TW88110188 A TW 88110188A TW 88110188 A TW88110188 A TW 88110188A TW 424156 B TW424156 B TW 424156B
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TW
Taiwan
Prior art keywords
polarized light
isosceles
polarized
light
converter
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TW88110188A
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Chinese (zh)
Inventor
Jeng-Wei Ju
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Ind Tech Res Inst
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Publication of TW424156B publication Critical patent/TW424156B/en

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Abstract

A polarization converter which utilizes optical thin film technology to plate a high-reflectivity mirror and a quarter wave phase retardation film on the waist and the leg side of the equilateral prism respectively as the phase retarder. An optical film is plated on the slope of an equilateral right-angled prism and two above mentioned equilateral right-angled prisms are combined to form the polarization beam splitter. The polarization beam splitter and the phase retarder are combined to form the polarization converter. The decomposed P-polarized light by the polarization beam splitter is converted to S-polarized light after two reflections of the phase retarder.

Description

i. Description of the invention (f) The present invention relates to a technology for converting a polarized light type, and more particularly to a technology for achieving a conversion of a polarized light type using a coating technology. In the liquid crystal projection system, as shown in FIG. 1, it polarizes the light generated by the light source 10 into a polarized light type that can be used by a light valve in the liquid crystal projection system. To achieve this, a polarizer, such as polarizer 14, must be used in the system to polarize the light source. As shown in the figure, the P polarized light in the light source 10 passes through the polarizer 14, and the S polarized light is reflected by the polarizer 14. After that, the P-polarized light is converted into the S-polarized light by the half-wave plate 18, and the S-polarized light reflected by the polarizing plate 14 is reflected by the mirror 16 again. In this way, the light source 10 can be completely converted into an S-polarized aurora. However, ordinary polarizers have the problem of absorbing light energy, which causes serious light energy loss. There are several designs of existing polarization converters. One of them is a combination of a half-wave plate and a quarter-wave plate, for example, US Patent No. 5,200,843 filed by Karasawa et al., US Patent No. 5,381,278 filed by Shingaki et al., And Karasawa et al. US Patent No. 5,278,680. Another design method is to use the total reflection method of the beam to change the angle between the polarization direction of the light and the incident surface, so that the total effect can achieve the purpose of deflection of the polarization direction by 90 degrees. For example, US Patent No. 5,485,110 and Inada et al. Arai et al., US Patent No. 5,684,630, etc. Inada's patent proposes to use half-wave plates and quarter-wave plates made of birefringent materials, but high-quality birefringent materials (please read the precautions on the back before filling this page) -• Order ----- Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 1 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 4 r 〆f 4 r 〆f A7 B7 4793twf .doc / 008 i. Description of the invention (π) The manufacturing cost is high, which will increase the cost of the polarized light converter. Arai's patent proposes a method of using several total reflection surfaces, but it will be difficult for the beam to light and the structure is complicated. In summary, the conventional polarized light converter has disadvantages such as high cost and too complicated optical structure. Therefore, the present invention proposes a polarized light converter that uses optical thin film technology to replace the conventionally used high-cost birefringent material. The present invention proposes a polarized light converter, which can use a quarter retarder instead of a half-wave plate. The present invention proposes a polarized light converter, which uses optical film technology and a quarter retarder to replace the conventionally used high-cost birefringent half-wave plate, and designs an appropriate optical film to have a wide-band characteristic. The polarized light converter disclosed in the present invention is briefly described as follows: A polarized light converter includes a polarized beam splitter and a phase retarder. The polarizing beam splitter is composed of two isosceles right-angled ridges, and the two inclined surfaces are glued to each other. One of the isosceles sloping surfaces is coated with an optical film layer so that the first polarized light in the light source (such as P polarized aurora ) Pass, the second polarized light (S polarized light) is reflected. The phase retarder is also composed of an isosceles, and its bevel is coated with a dielectric optical film layer as a quarter-wave phase retarder to delay the phase of the first polarized aurora; The surface is plated with a high-reflection mirror to reflect the first polarized light of the retarded phase, and the other waist surface is coupled to the exit surface of the polarized beam splitter at 45 degrees to each other. The first polarized light incident on the phase retarder is reflected by the high-reflection mirror 4 (Please read the precautions on the back before filling in this page). --------- " • Order --------- Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs • This paper is printed in accordance with the Chinese National Standard (CNS) A4 (210 X 297 mm). Printed by the Employees’ Cooperative of the Intellectual Property Bureau of the Ministry of Economics 424156 4793twf4doc / 〇〇8 5. After the invention (5), the light will be reflected along the original incident light path, thereby converting the first polarized light into the second polarized light. A polarized light converter according to another embodiment includes a polarized beam splitter and a phase retarder. The polarizing beam splitter group is composed of two polarizing beam splitters, and each polarizing beam splitter is formed by coupling and gluing two isosceles of the isosceles. The isosceles of the isosceles are coated with an optical film layer, so that the first polarized light (P polarized light) in the light source incident on the polarized beam splitting group passes, the second polarized light (S polarized light) reflects, and two polarized lights The waist surfaces of the isosceles of the beam splitter are coupled to form a polarizing beam splitting group, so that the slopes of the isosceles prisms form an angle of 90 degrees. The phase retarder is used to receive the first polarized light. The phase retarder is composed of the third isosceles, and the bevel is plated with an optical film layer as a quarter-wave phase retarder to delay the phase of the first polarized light, and the third isosceles The waist surface of 稜鏡 is plated with a high-reflection mirror to reflect the first polarized light of the retarded phase, and the other waist surface is coupled to the exit surface of the polarized beam splitter at 45 degrees to each other, and the incident phase delay After the first polarized light of the reflector is reflected by the high-reflection mirror, it reflects along the original optical path, thereby converting the first polarized light into the second polarized light. In this way, the light source can be completely converted into polarized light (S polarized light) of the same type and polarized light emitted in the same direction. With the polarized light converter of the present invention, the light source can be completely converted into polarized light of the same type. At the same time, the use of optical thin film technology to achieve the purpose of polarized light splitting, quarter-wavelength phase retardation, and odor reflection can be applied to light sources with an extremely wide wavelength range. In order to make the above-mentioned objects, features, and advantages of the present invention more obvious and easier 5 ------------- ^ equipment -------- order --------- line 4 (Please read the precautions on the back before filling this page) This paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 24 1 5 6 4793twf.doc / 008 V. Description of the Invention (V) Understand that the preferred embodiments are described below in detail with the accompanying drawings as follows: Brief description of the drawings: Figure 1 shows a light source bias in a liquid crystal projection system. Schematic diagram of the polarization device; _ Figures 2A to 2C show the schematic diagram of coating an optical film on the surface of the isosceles to form a quarter-wave retarder; Figure 3 shows Figure 2C When the high-reflection mirror plated on the waist of the 稜鏡 -type quarter-wave retarder is made of a metal film, the reflectance spectrum is at a wavelength of 400 nm to 7500 nm; Figure 4 shows Figure 2C When the high-reflection mirror plated on the waist of the medium-sized quarter-wave retarder is made of an all-dielectric film, the wavelength is between 400nm and 750nm. Figure 5A shows the spectrogram of the reflectance; Figure 5A shows the phase shift of the reflected light of the optical film plated on the waist of the 的 -type quarter-wave retarder in Figure 2C (the incident angle of the incident light is 36 ° .5) Spectral chart; Figure 5B shows the spectral chart of the reflectivity of the optical film plated on the waist of the 稜鏡 -type quarter-wave retarder in Figure 2C; Figures 6A to 6C are plotted separately FIG. 7A shows the manufacturing process of the polarizing beam splitter of the present invention and the position of the optical coating surface; FIG. 7A shows the transmittance spectrum of the polarizing beam splitter between P and S polarizing beams at a wavelength of 400 nm to 750 nm; Looking at Figure 7B, it shows the reflectance spectrum of P and S polarized light with a polarizing beam splitter between 40nm and 750nm: 6 ---------. 1 ^ install --- ----- Order -------- Line-1 · (Please read the precautions on the back before filling this page) The paper size is in accordance with the Chinese National Standard (CNS) A4 (210 X 297 mm) A7 B7 424 15 4793twf.doc / 008 V. Description of the invention (c) Figure 8A shows a schematic perspective view of an embodiment of a polarized light converter according to the present invention; Figure 8B shows a side view of Figure 8A; Article 8C FIG. 9A is a top view of the incident light direction from FIG. 8A; FIG. 9A is a schematic perspective view of another embodiment of the polarized light converter according to the present invention: FIG. 9B is a side view of FIG. 9A; FIG. 9C shows a top view of the incident light direction from FIG. 9A; and FIG. 10 shows a schematic diagram of a liquid crystal projection system using the polarized light converter of the present invention. DESCRIPTION OF SYMBOLS: 10 light source, 12 filter, 14 polarizing beam splitter, 16 reflector, 18 half-wave plate, 20 waist, etc. 20 'phase retarder, 22 bevel plated with optical film, 24 waist plated with high reflection mirror, 26 other waist face, 30 Isosceles Prism 32 Optical Plated Slope 40 Polarizing Beamsplitter 42 Optical Film for Polarizing Beams 44 Waistside 50 Polarizing Beamsplitter Group 40a Polarizing Beamsplitter 40b Polarizing Beamsplitters 52, 54 One of the optical film 56 稜鏡 waist 60 light source 62 polarized light converter 64 light concentrating device 66 light valve This paper size applies to China National Standard (CNS) A4 specification (210 X 297 mm) -------- ----- ^ 装 -------- Order --------- line— (< Please read the precautions on the r page before filling out this page) Employees of the Bureau of Intellectual Property, Ministry of Economic Affairs Printed by the Consumer Cooperative A7 B7 4793twf.doc / 008 V. Description of the Invention (6) Example-The present invention mainly uses the optical film technology to design a quarter wavelength retarder. A high-reflection mirror surface is plated on one of the waist surfaces of a first-class waistband, and a metal film or a dielectric film is plated on the inclined surface. And the dielectric film 'on the hypotenuse of the isosceles right-angle prism is used as a polarizing beam splitter. A combination of these two types of polarized polarizers was invented at the cost of purchase. In the following, a preferred embodiment is used to specifically describe the structure of the present invention and the effects it can achieve. First, the design of a quarter-wave retarder will be explained. Please refer to FIGS. 2A to 2C ′, which are schematic diagrams of coating an optical film on the surface of the isosceles to form a quarter-wave retarder. As shown in Fig. 2A ', a first-line lumbosacral 20 is selected, and its waist angle is 0 °. The objective of the present invention is not achieved, that is, a quarter-wave retarder has the effect of a conventional half-wave plate, and its waist angle Θ must be designed. This waist angle ^ is related to the material of the prism. In this embodiment, lanthanum fluoride (LaF3) is used as the samarium material, so the waist angle is selected to be 36 ° .5. First, on the inclined surface 22 of the prism 20, the incident angle is 36. .5, the selected metal film is silver (Ag) and the dielectric film is Si02 plated on the inclined surface 22 sequentially. The thickness of each layer is shown in Table 1. Next, on one of the waist surfaces 24 of the cymbal 20, a highly reflective mirror surface is plated. In this embodiment, the coating material of the high-reflection mirror may be a metal film, such as the inscription (A1) shown in Table 2; or it may be formed by using an all-dielectric film. The all-dielectric film is a multilayer film formed by high and low refractive index stagger plating. In this example, the Chinese paper standard (CNS) A4 (210 X 297 mm) is applied to the paper size of 2-8 (Please read the precautions on the back before filling this page) 褒 I--Order ----- .Line 1 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 424156-A7 4 Ί93twf. Doc / 008 5. Description of the invention (1) Made of titanium oxide and silicon dioxide, each layer The preferred thickness is shown in Table III. The materials and thicknesses listed in Tables 1 to 3 will vary depending on the material and the angle of incidence. Those skilled in this art should know how to modify it. Accordingly, a quarter-wave retarder in the polarized-light converter of the present invention is constructed. Please refer to Figures 3 and 4, which show that the high-reflection mirrors coated on the waist surface 24 of 稜鏡 20 are made from Table 2 (metal film) and Table 3 (all-dielectric film), respectively. In the case of 750nm, the reflectance (%) spectrum chart can be seen from Figure 3. When the high-reflection mirror is a metal film, the reflectance distribution is between about 80% and 90%; and Figure 4 can It can be seen that when the reflector is a full dielectric film, the reflectance distribution is close to 100%. It can be seen that the reflection effect is good. Figures 5A and 5B are the spectral diagrams of the phase shift (incidence angle of 36 ° .5) and reflectance of the reflected light of the optical film plated on the inclined surface 22 of 稜鏡 20, respectively. Table 1 Material thickness of the film layer (nm) Air '1 _ Ag 11.58 2 SiO, 77.80 LaFq 9 ------------ Equipment------- Order--------- Line · (谙 Please read the notes on the back before filling in this page) This paper size is applicable to China National Standard (CNS) A4 (210x 297 male cage) 4 2 4 彳 5 6 A7 B7 V. Description of the invention () Table 2 Film Layer No. Material Thickness (nm) Air 1 A1 70.00 LaF, Printed by the Intellectual Property Bureau Staff Consumer Cooperatives of the Ministry of Economic Affairs Film thickness (nm) Film thickness (nm) Air 1 Ti〇, 23.97 22 Si〇2 60.72 2 SiO, 51.46 23 TiO? 59.30 3 TiO, 71.31 24 SiO, 116.51 4 SiO, 68.08 25 TiO, 66.56 5 TiO, 29.49 26 SiO, 35.82 6 SiO? 67.71 27 TiO, 78.58 7 Ti07 45.24 28 Si〇, 106.95 8 SiO, 75.87 29 TiO, 71.02 9 Ti02 39.44 30 SiO, 120.30 10 Si07 56.06 31 Ti02 74.20 11 Ti02 48.91 32 Si07 1 14.69 12 SiO? 80.36 33 TiO, 67.64 13 TiO, 45.92 34 SiO, 121.90 14 Si〇2 40.43 35 TiO, 77.23 15 Ti02 79.78 36 SiO, 136.42 16 SiO, 90.66 37 Ti02 71.90 17 Ti02 64.55 38 Si〇, 128.20 18 Si02 42.82 39 TiO, 73.10 19 Ti07 63.31 40 SiO, 146.58 20 SiO, 106.30 41 TiO? 91,19 21 Ti02 67.28 LaF, ------------- (-Nong— (please first (Please read the notes on the back and fill in this page)... Line. This paper size applies to China National Standard (CNS) A4 (210 X 297 mm). Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and Consumer Cooperatives. 424156 A7 4793twf.doc / 008 Listen to 5. Description of the Invention (ί) Refer to Figures 6A to 6C, which illustrate the polarizing beam splitter of the present invention. The polarizing beam splitter is plated with a multi-layer dielectric film made of the materials and thicknesses listed in Table 4 on the beveled surface 32 of the isosceles right angle 稜鏡 30, as shown in FIG. 6B. The material of 稜鏡 30 in this example is still LaF3. Multilayer dielectric films are made by staggering Si02 and Ti02. Finally, the oblique JI surface was glued with two cymbals with the same material and the same coating to form a cube polarizing beam splitter 40. The polarizing beam splitter 40 allows the P polarized light in the light source to pass, and allows the S polarized light to reflect. The parameters of the multilayer dielectric film plated on the above-mentioned hypotenuse surface 32 satisfy the following design formula:

Its np is the refractive index of 稜鏡 30, which is the refractive index of the plated low-refractive-index material, nH is the refractive index of the plated high-refractive-index material, and θp is the incident angle of incidence to the hypotenuse. Use this formula to design a polarizing beam splitter. FIG. 7A shows the transmittance spectrum of the polarized beam splitter 40 with P and S polarized light at a wavelength between 400 tim and 75 nm. It can be seen from the figure that in this band, P-polarized aurora can penetrate almost 100%, while S-polarized aurora does not penetrate. Furthermore, as shown in FIG. 7B, it shows the reflectance spectrum graphs of the polarized beam splitter 40 with P and S polarized light at a wavelength between 400 nm and 7500 nm. It can be seen from the figure that in this band, the S-polarized light can be reflected almost 100%, while the P-polarized light is not reflected. Therefore, from these two spectrograms, it can be seen that the polarized beam splitter 40 can make the P polarized light in the light source penetrate almost loo%, and the s polarized light can reflect loo%. ------------ (install -------- order -------- 'line — ({Please read the note on the back ^^ before filling this page) This paper size applies to China National Standard (CNS) A4 specifications < 210x 297 mm) r-^ 6 5 i 4 2 4 8 ο ο / c ο dfwt 3 9

7 7 A B 5. Description of the invention (π) Therefore, its efficiency is extremely high. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. Sheet thickness of the film layer (nm) Substrate LaF3 1 Si02 179.37 2 Ti02 58.90 3 Si〇2 79.09 4 Ti02 25.04 5 Si02 146.19 6 Ti02 42.10 7 Si02 83.95 8 Τΐ〇2 3 1.29 9 Si02 153.30 10 Ti02 152.95 11 Si02 221.74 12 Ti02 67.45 13 Si02 148.78 14 Ti02 93.54 15 Si〇2 86.48 16 Ti02 88.82 17 Si02 137.48 18 Ti02 93.39 19 Si02 184.23 20 Ti02 113.53 LaF3 (Please read the notes on the back before filling in this page)

1 ^ n IIIII n * in I n ^ n III nt it ϋ II «I n! N ϋ t— 4— ϋ ϋ II n II This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs Λ2415 S! A7 4793twf, doc / 008 ㈤ V. Description of the invention ((() The polarizer converter of the present invention is a quarter-wave retarder of the above-mentioned Figure 2C) 'Compared with the polarizing beam splitter 40 shown in FIG. 6C. The principle and function of the polarizing beam converter according to the present invention will be described below with examples. Please refer to FIG. 8A, which illustrates the implementation of the polarizing beam converter according to the present invention. Figure 8B is a side view of Figure 8A; and Figure 8C is a top view of the direction of incident light from Figure 8A. Refer to Figure 8A, which is disclosed according to an embodiment of the present invention. A three-dimensional schematic diagram of the structure of a polarized polarizer converter. A polarized polarizer converter includes a polarized beam splitter 20 'and a phase retarder 40. The polarized beam splitter 20' is formed by gluing the slopes of two isosceles. The beveled surface is coated with an optical film layer 42 so that the light source The P polarized light passes through, and the S polarized light reflects. The phase retarder 20 'is an isosceles, and the inclined surface is coated with a dielectric optical film layer 22 as a quarter-wave phase retarder and isosceles. The waist surface of the mirror is plated with a high-reflection mirror 24, and the other waist surface 26 is coupled to the exit surface 44 of the polarizing beam splitter 40 at 45 degrees to each other, as shown in Figure 8C. 7 \ 0 is derived from Figure 8B See, the light emitted by the light source contains two types of polarized light, such as P-polarized light and S-polarized light with a phase angle of 90 degrees. Here, the light source is completely converted into S-polarized light. Two types of polarized light, P and S. This light source is incident on the polarized beam splitter 40 '. The structure of this polarized beam splitter 40 is shown in Figure 6C. The P polarized light in the light source directly penetrates the optical film. 42, and the S polarized aurora is reflected by the optical film 42. The P polarized aurora passing through will be 13 ------------ ^ Nong --------- Order ----- ----- Line " f (Please read the notes on the back before filling in this page) This paper is again applicable to China Store Standard (CNS) A4 (210 X 297 mm) A7 B7 4793twf.doc / 008

V. Description of the invention (PO is incident on the quarter retarder 20 '. The P polarized aurora is incident on the optical film 22 of the phase retarder 20' at a waist angle of 36 °. 5 as the incident angle, thereby retarding the phase by 90 And the polarization direction is deflected by 45 degrees. The light with a phase delay of 90 degrees is then incident perpendicularly to the high-reflection mirror 24. After this light is reflected by the high-reflection mirror, it enters the optical film 22 of the phase retarder 20 'again along the original optical path. Therefore, the phase is delayed by 90 degrees again, and the polarization direction is deflected by 45 degrees. Then, the original P polarized light is converted into S polarized light. This S polarized light is then reflected by the optical film 42 of the polarized beam splitter 40 From Figure 8B, it can be seen that the light source (including P and S polarized lights) is converted into two S polarized lights with opposite directions. The above polarized light converter is made of the optical film mentioned above. It can be seen from the spectra of Figures 3, 4, 5, 8, 7, 7, and 73 that the conversion efficiency of the polarized light converter of the present invention is excellent, and the phase delay is between 180 ° ± 2 °. The wavelength range is extremely wide, between 400nm and 7500nm. Please refer to Figure 9A, which is based on this A schematic view of an embodiment of the invention of the polarized light converter. Fig. 9B shows a side view of Fig. 9A; and Fig. 9C shows an upper view from the direction of incident light of Fig. 9A. Refer to Fig. 9A , Which is a schematic perspective view of the structure of another polarized light converter according to an embodiment of the present invention. The polarized light beam splitter group 50 is composed of a first polarized light beam splitter 40a and a second polarized light beam splitter 40b. The first and second polarizing beam splitters 40a and 40b are formed by coupling the isosceles of the isosceles, and the isosceles of the isosceles are plated with an optical film layer 52'54, so that the incident light is polarized. The paper size of P in the light source of the polarizing group 50 is based on the national standard (CNS) A4 specification (210x 297 mm) ---------- 1Λ ^---- order --- ----- line · ^ (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 156 ^ 193twf.doc / 008 A7 B7 Consumer Cooperative Cooperation of the Intellectual Property Bureau of the Ministry of Economic Affairs Printing 5. Description of the invention (丨〉) The aurora passes through, and the S polarized aurora reflects, and the polarizing beam splitter 40a and the polarizing beam splitter 40b are formed with isosceles edges. The waist surface is coupled so that the inclined surfaces of each of the lumbosacrals form an angle of 90 degrees. The phase retarder 20 'is the same as the phase retarder 20' in Fig. 8B, and will not be described here. Fig. 9B From the point of view, the light emitted by the light source includes two types of polarized light, such as P polarized light and S polarized light. Here we want to completely convert the light source into S polarized light. The difference from Figure 8B is that An additional set of polarizing beam splitters 40b can be used to emit the S polarized lights in two different directions in the same direction in the same example. Similarly, the polarizing converter described above is made of the optical film mentioned above. In addition, from the spectra of Figures 3, 4, 5A '5B, 7A, and 7B, it can be seen that the conversion efficiency of the polarized light converter of the present invention is excellent, and the phase delay is between 180 ° ± 2 °. The applicable wavelength range is extremely wide, between 400nm and 750nm. The polarized light converter of the present invention can be applied to a liquid crystal projection system. As shown in Figure 10. The light emitted from the light source 60 includes two types of polarized light, P and S polarized light. After passing through the polarized light converter 62, the light (P and S polarized light) generated by the light source is converted into the same type of polarized light (such as S polarized light). Through the light collecting device 64, the S polarized light reflected by the polarized light converter 62 is superimposed on the light valve 66. This light valve may be a light valve of a liquid crystal display (LCD). The polarized light converter 62 adopts the structure disclosed in FIG. 8A or 9A, so the conversion efficiency of the polarized light converter 62 is excellent, and the applicable wavelength range is also extremely wide. Because polarized light converter 62 replaces ------------ (^ .-------- Order --------- line (Please read the precautions on the back before (Fill in this page) This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) 42 ^ 1 56 Λ7 4793twf.aoc / 008 _bi 5. Description of the invention (punching) Expensive birefringent half-wave plate Converting polarized light, so the cost can be reduced. In summary, compared with the conventional technology, the polarized light converter of the present invention has at least the following advantages and effects: According to the polarized light converter of the present invention, it uses four The two-phase retardation of a half-wave phase retardation plate achieves the same effect as the half-wave series. According to the polarizing light converter of the present invention, the technology of optical film is used to make a polarizing beam splitter and a quarter-wavelength The phase retardation plate and the high-reflection mirror can achieve high-efficiency polarized light conversion and have a wide range of applicable wavelengths. According to the polarized polar light converter of the present invention, the technology of optical film is used to design a simple polarized optical element to design polarized light. Aurora converter, thereby reducing the production of polarized light converters In summary, although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes without departing from the spirit and scope of the present invention. Changes and retouching, so the scope of protection of the present invention shall be determined by the scope of the attached patent application. The paper size applies to the Chinese National Standard (CNS) A4 specification (210 X 297 mm)

Claims (1)

  1. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 424156 ^ AS BS 4793twf.doc / 008 CS D8 VI. Application for a patent 1. A polarized light converter, including: a polarized beam splitter, which consists of a first isosceles The inclined surface of the mirror is coupled with the inclined surface of a second isosceles, and the inclined surface of the first isosceles is plated with a first optical film layer, so that the light incident on a light source of the polarizing beam splitter is incident. A first polarized light passes, a second polarized light is reflected, and a phase retarder is used to receive the first polarized light, the phase retarder is composed of a third isosceles, and the inclined surface is plated with a The second optical film layer is used as a quarter-wave phase retarder to delay the phase of the first polarized light, and a high-reflection mirror is plated on the waist surface of one of the third isosceles. The first polarized light of the retarded phase is reflected, the other waist surface is coupled to the exit surface of the polarized beam splitter and mutually formed at 45 degrees, and the first polarized light incident to the phase retarder is highly reflected by the After the specular reflection, the light is reflected along the original light path, so that the first polarized light is reflected. Into the second polarized light. 2. The polarized aurora converter as described in item 1 of the scope of patent application, wherein the first isosceles and the second isosceles are an isosceles right-angled triangle. 3. The polarizer converter as described in item 1 of the scope of patent application, wherein the material of the first and second isosceles is lanthanum trifluoride (LaF3). 4. The polarizer converter according to item 1 of the scope of the patent application, wherein the optical film layer coated on the inclined surface of the first isosceles is a multilayer film formed by alternately plating silicon dioxide and titanium dioxide. 5. For the polarized light converter described in item 3 of the scope of patent application, the 17 paper sizes are applicable to the Chinese National Standard (CNS) A4 specification (mm) (please read the precautions before filling this page) 1T AS B8 rs DS 4 2 4 1 α:, 4793twf.doc / C08 6. The material of the third-level lumbosacral lining in the scope of patent application is lanthanum trifluoride (LaF3). (Please read the notes on the back before filling this page) 6. The polarizer converter as described in item 5 of the scope of patent application, in which the waist angle of the third-level waistband is 36.5 degrees. 7. The polarizer converter as described in item 5 of the scope of patent application, wherein the high-reflection mirror-type aluminum film is plated on the waist surface of the third isosceles. S. The polarizer converter as described in item 5 of the scope of patent application, wherein the high-reflection mirror plated on the waist surface of the third isosceles is a multilayer film that is alternately plated with silicon dioxide and titanium dioxide. 9. The polarized light converter as described in item 5 of the scope of patent application, wherein the dielectric optical film layer plated on the inclined surface of the third isosceles is made of silver and silicon dioxide. 10. A polarized polarizer including: a polarized beam splitter printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, consisting of a first polarized beam splitter and a second polarized beam splitter. One and the second polarizing beam splitter are formed by coupling a slope of the first isosceles and a slope of the second isosceles. The slope of the first isosceles is coated with an optical film layer. To pass a first polarized light incident on one of the light sources of the polarized beam splitting group and a second polarized light to reflect, wherein the first polarized beam splitter and the second polarized beam splitter are arranged at respective waists The waist surfaces of the lumps are coupled so that the inclined surfaces of each of the waist lumens form a 90-degree included angle; and a phase retarder is used to receive the first polarized aurora. Structure, the oblique surface is plated with a second optical film layer as a quarter-wave phase retarder for retarding the phase of the first polarized light, and the waist surface of one of the third isosceles is plated The above paper size is applicable to China National Standard (CNS) A4 specification (210 × 297 mm) 42415 6, 4793twf.doc / 008 6. The scope of patent application is a high reflector for reflecting the first polarized light with a delayed phase, and the other waist surface is coupled with the exit surface of the polarized beam splitter and mutually form each other. At 45 degrees, the first polarized light incident on the phase retarder is reflected by the high-reflection mirror and then reflected along the original optical path, thereby converting the first polarized light into the second polarized light. 11. The polarized polarizer converter as described in item 10 of the scope of patent application, wherein the lumbosacral isosceles right-angled triangles constituting the first and second polarized beam splitters. 12. The polarizer converter as described in item 10 of the scope of patent application, wherein the material of the waistbands of the first and second polarizers is lanthanum trifluoride (LaF3). 13. The polarizer converter according to item 10 of the scope of the patent application, wherein the optical film layer plated on the inclined surface of the first isosceles is a multilayer film formed by alternately plating silicon dioxide and titanium dioxide. 14. The polarized aurora converter according to item 12 of the scope of patent application, wherein the material of the third isosceles is lanthanum trifluoride (LaF3). 15. The polarized aurora converter according to item 14 of the scope of patent application, wherein the waist angle of the third isosceles is 36.5 degrees. 16. The polarizer converter according to item 14 of the scope of patent application, wherein the high-reflection mirror-type aluminum film is plated on the waist surface of the third isosceles. 17. The polarized light converter described in item (1) of the scope of patent application, wherein the high-reflection mirror plated on the waist surface of the third isosceles is a multilayer film formed by staggering silicon dioxide and titanium dioxide. 18. For the polarized polarizer converter described in item 14 of the scope of patent application, the paper size applies to the Chinese National Standard (CNS) A4 specification (210 × 29? Mm) (Please read the precautions on the back before filling this page), 1T Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 1 1 6 6 ^ A8 BS 4793twf.doc / 00S Γ8 DS VI. Application scope of patents where the optical film layer of the medium, which is plated on the inclined surface of the third-level waist, is made of silver Coated with silicon dioxide. 19. A liquid crystal projection system, comprising: (read the precautions on the back before filling out this page) a light source; a polarized light converter that is placed at a position that can receive the light generated by the light source, The generated light is converted into a polarized light of the same type; a light-concentrating device is arranged at a position that can receive the light reflected by the polarized light converter, and is used to reflect the polarized light of the same type from the polarized light converter The aurora is superimposed on a light valve. 20. The polarized light converter described in item 19 of the scope of patent application, wherein the polarized light converter further includes: a polarized beam splitter printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, which is composed of a first isosceles The inclined surface of the mirror is coupled with the inclined surface of a second isosceles, and the inclined surface of the first isosceles is plated with a first optical film layer, so that the light incident on a light source of the polarizing beam splitter is incident. A first polarized light passes, a second polarized light is reflected, and a phase retarder is used to receive the first polarized light, the phase retarder is composed of a second isosceles, and its slope is plated with a The second optical film layer is used as a quarter-wave phase retarder for retarding the phase of the first polarized light, and one of the third isosceles prisms is plated with a high-reflection mirror for The first polarized light is reflected by the retarded phase, the other waist surface is coupled to the exit surface of the polarized beam splitter and mutually formed at 45 degrees, and the first polarized light incident on the phase retarder is reflected by the high mirror After the reflection, the light is reflected along the original light path, so that the first polarization is The paper is converted into 20 scales applicable Chinese National Standard (CNS) A4 size (210X297 mm)
TW88110188A 1999-06-17 1999-06-17 Polarization converter TW424156B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9057881B2 (en) 2012-04-17 2015-06-16 Delta Electronics, Inc. Illumination system for a projection apparatus and projection apparatus
US9122068B2 (en) 2012-02-22 2015-09-01 Delta Electronics, Inc. Polarization converting element group for projection apparatus and projection apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9122068B2 (en) 2012-02-22 2015-09-01 Delta Electronics, Inc. Polarization converting element group for projection apparatus and projection apparatus
US9057881B2 (en) 2012-04-17 2015-06-16 Delta Electronics, Inc. Illumination system for a projection apparatus and projection apparatus

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