WO1998003898A1 - Ecran de projection arriere - Google Patents
Ecran de projection arriere Download PDFInfo
- Publication number
- WO1998003898A1 WO1998003898A1 PCT/JP1997/002546 JP9702546W WO9803898A1 WO 1998003898 A1 WO1998003898 A1 WO 1998003898A1 JP 9702546 W JP9702546 W JP 9702546W WO 9803898 A1 WO9803898 A1 WO 9803898A1
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- WO
- WIPO (PCT)
- Prior art keywords
- diffusion
- lens sheet
- light
- diffusing
- sheet
- Prior art date
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/62—Translucent screens
- G03B21/625—Lenticular translucent screens
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/62—Translucent screens
Definitions
- the present invention relates to a transmission type screen mainly used for a rear projection type projector such as a video projector and a slide projector.
- transmissive screen a transmissive screen power using a lenticular lens sheet based on a synthetic resin material such as polymethyl methacrylate alone or in combination with another lens sheet is known.
- image light was observed by a light source such as a CRT, for example, and observed.
- a tube power with a small projection pupil such as a liquid crystal projector or a light valve has been used instead of the CRT.
- the conventional transmission screen has a problem that when such a tube having a small projection pupil is used, flickering of an image called scintillation or speckle appears.
- the present invention has been made in view of such a point, and does not require an additional device even when using a small projection pupil and a tube, and minimizes a decrease in gain and a decrease in resolution. It is an object of the present invention to provide a transmission screen capable of preventing flickering of an image such as a scintillation image while keeping the screen.
- a first feature of the present invention is that in a transmission type screen provided with a lens sheet having an optical function of condensing or expanding light, the lens sheet has at least two diffusion portions separated in a light transmission direction. It is a transmission type screen characterized by having.
- one of the at least two diffusing portions is preferably provided on a light-incident side surface of the lens sheet, and the other is preferably provided on a light-exiting surface of the lens sheet.
- at least two diffusion portions are provided on the surface and inside of the lens sheet.
- a transmission screen including a plurality of lens sheets or optical sheets having an optical function of condensing or diffusing light
- at least one of the plurality of lens sheets or optical sheets is provided.
- One is a transmissive screen having at least one unit, and the plurality of lens sheets or optical sheets as a whole has at least two diffusion units.
- each diffusing portion is provided on or in the surface of the lens sheet or the optical sheet.
- the lens sheet or optical sheet disposed closest to the light source side is provided on the light-entering surface of the lens sheet or the optical sheet, and the diffuser of the lens sheet or the optical sheet disposed closest to the observation side is the lens sheet or the optical sheet. It is good to be provided on the surface on the light emission side.
- the diffusion section closer to the light source side has a higher degree of light diffusion than the diffusion section closer to the observation side than this diffusion section. I hope it's getting smaller.
- the diffusing portion near the light source side is formed by adding the first diffusing fine particles into the first base material, and the diffusing portion near the observation side is the second base material.
- the difference between the refractive indices of the first diffusing fine particles and the first base material is formed by adding the second diffusing fine particles therein, and the difference in the refractive index between the second diffusing fine particles and the second base material. It is better to be smaller than.
- FIG. 1 is a diagram showing a first embodiment of a transmission screen according to the present invention.
- FIG. 2 is a diagram showing a second embodiment of the transmission screen according to the present invention.
- FIG. 3 is a view showing a first embodiment of the transmission screen according to the present invention.
- FIG. 4 is a view showing a second embodiment of the transmission screen according to the present invention.
- FIG. 5 is a view showing a third embodiment of the transmission screen according to the present invention.
- FIG. 6 is a view showing a fourth embodiment of the transmission screen according to the present invention.
- FIG. 7 is a view showing a fifth embodiment of the transmission screen according to the present invention.
- FIG. 8 is a view showing a sixth embodiment of the transmission screen according to the present invention.
- 9A and 9B are views showing a seventh embodiment of the transmission screen according to the present invention.
- FIG. 10 is a diagram showing a comparative example of a transmission screen. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a diagram showing a first embodiment of a transmission screen according to the present invention.
- the transmissive screen 1 is composed of a single lens sheet formed on one or both surfaces, such as a Fresnel lens or a lenticular lens, and has at least two light transmitting directions (left and right directions in the drawing).
- the diffusion section 11B is provided in a localized (separated) manner.
- the diffusion unit is composed of a single lens sheet formed on one or both surfaces, such as a Fresnel lens or a lenticular lens, and has at least two light transmitting directions (left and right directions in the drawing).
- the diffusion section 11B is provided in a localized (separated) manner.
- 1A and 1B are provided on the light-incident side surface (light-incident surface) and the light-exit side surface (light-exit surface) of the lens sheet.
- the diffusing portions 1A and IB are portions for imparting a light diffusing action, and include a resin layer containing fine (diffusible fine particles) such as micro lenses, glass beads or organic beads, or micro lenses. It can be easily formed by a general method such as embossing of the surface.
- the diffusion section is not limited to the surface of the lens sheet, and may be provided inside the lens sheet like the diffusion section 1C.
- the diffusing portions 1A and 1B diffuse the light source light so as to eliminate the interference of the light source light, problems such as scintillation and speckle can be solved.
- diffusing the light from the light source reduces the resolution, and when a large amount of a diffusing agent is added to a single diffusing portion as in the conventional technology, the gain is reduced and the image becomes extremely poor. Get dark.
- the two diffusing portions 1A and IB are provided separately on the lens sheet, so that the amount is smaller than the amount of the diffusing agent used in the case of a single diffusing portion. It is possible to weaken the strength of scintillation etc. to the same degree with a diffusing agent of ⁇ and it is possible to use a small amount of diffusing agent ⁇ Unnecessary reduction in brightness can be prevented.
- the two diffusion portions 1A and 1B are separately provided on the lens sheet, so that the amount of the expansion is reduced, so that the amount of stray light generated inside the diffusion portions 1A and 1B can be reduced. Therefore, unnecessary reduction in resolution such as flare and ghost can be suppressed.
- moire generated due to mutual interference between the Fresnel lens, the lenticular lens, the pixels of the light source, and the like can be reduced by such a light diffusion action.
- the diffusion portions 1A and 1B are provided on the light-incident side and the light-exit side of the lens sheet. This is because, by increasing the distance between the diffusion units 1A and 1B and eliminating the coherence of the light from the light source, the light diffusion effect at each of the diffusion units 1A and 1B is suppressed to a very weak level. This is because the strength of the scintillation and the like can be reduced while the brightness of the image can be greatly reduced.
- the diffusing portion 1A closer to the light source side has a smaller degree of light diffusion than the diffusing portion 1B closer to the observation side. This is because the intensity of scintillation and the like can be suppressed by reducing the diffusion of light by the diffusion element on the light incident side while preventing unnecessary reduction in resolution.
- the roughness of the flickering motion (the size (roughness) of the scintillation etc.) that occurs when a moving image is projected is included. is there.
- a diffusing agent having a small difference in refractive index from the base material.
- the average It is preferable to add a diffusing agent having a small particle size.
- the difference in the refractive index from the base material is small in both the diffusion section 1A near the light source side and the diffusion section 1B near the observation side. It is conceivable to add a diffusing agent having a small average particle size. However, a diffusing agent having a small difference in the refractive index from the base material or a diffusing agent having a small average particle size narrows the viewing angle, so that both the problems of scintillation and the like and the problem of the viewing angle are solved. It is preferable that the type of the diffusing agent added to the diffusing section 1A and the type of the diffusing agent added to the diffusing section 1B be different.
- the difference in the refractive index between the diffusing agent added to the diffusing portion 1A near the light source side and the substrate and the diffusing portion 1B near the observation side are described.
- the average particle size of the diffusing agent added to the diffusion part 1 B close to the side should be smaller than the difference in the refractive index between the diffusing agent added to the substrate and the substrate, and the predetermined particle size (for example, 15 // m) It is preferable to do the following.
- FIG. 2 is a diagram showing a second embodiment of the transparent screen according to the present invention.
- the transparent screen 2 includes a plurality of lens sheets or optical sheets 2-1, 2-2, 2-3,..., And each lens sheet or optical sheet 2-1, 2-2. , 2-3,... Are provided with diffusion portions 2 A, 2 B, 2 C,.
- the diffuser 2A is provided on the light-entering surface (light-entering surface) of the lens sheet or optical sheet 2-1 that is also located close to the light source side, and the diffuser 2B is located on the observation side. Most The light-emitting surface of the lens sheet or optical sheet 2-2 placed close to
- the diffusing section 2C is provided on the light incident side surface (light incident surface) of the lens sheet or optical sheet 2-3.
- the lens sheet includes a linear or circular Fresnel lens sheet, a lenticular lens sheet having a lenticular lens formed on one or both surfaces, or a Fresnel lens or a lenticular lens combined on each surface.
- a lens sheet or the like formed by using the above method is used.
- both surface forces of a resin such as polymethyl methacrylate and the like are used.
- FIG. 3 is a view showing a first embodiment of the transmission screen according to the present invention. This first example corresponds to the first embodiment shown in FIG. 1, in which two expansions (diffusion portions) are provided separately on both surfaces of a single lens sheet.
- a transmission screen 10 was made by forming 1 OA and 10 B.
- a diffusion layer 1OA is formed on the light incident surface 11a by embossing the Fresnel lens portion located on the light incident surface 11a, and an average particle diameter is formed on the light incident surface 11b.
- a diffusion layer 10B having a thickness of 500 m was formed by dispersing 15 parts by weight of glass beads of 11 m and a refractive index of 1.535.
- the amount (parts by weight) of the diffusing agent such as glass beads is a value based on 100 parts by weight of the base material into which the diffusing agent is mixed. It is.
- an impact-resistant methacrylic resin (refractive index: 1.51) manufactured by Sumitomo Chemical Co., Ltd. was used.
- glass beads having an average particle diameter of 11 m and a refractive index of 1.535 EMB20 manufactured by Toshiba Valoriti 12 was used.
- FIG. 4 is a view showing a second embodiment of the transmission screen according to the present invention.
- the second example corresponds to the second embodiment shown in FIG. 2, and is provided with two diffusion layers (diffusion portions) separated by force on each of two lens sheets.
- One of the two diffusion layers is provided on the surface of the lens sheet (the light incident surface of the Fresnel lens sheet).
- the transmission screen 20 was produced by combining the transmission screen 20 with the transmission screen 22.
- the Fresnel lens sheet 21 has a light entrance surface 21a having an average particle diameter of 12 jczm and a refractive index of 1.59 in which organic beads having a refractive index of 1.59 are dispersed in a weight of 150.
- An m diffusion layer 2 OA was formed.
- organic beads having an average particle diameter of 12 nu and a refractive index of 1.59 were uniformly mixed in the lenticular lens sheet 22 (diffusion layer 20 B).
- an impact-resistant methacrylic resin (refractive index 1.51) manufactured by Sumitomo Chemical Co., Ltd. was used as a base material of the Fresnel lens sheet 21 and the lenticular lens sheet 22.
- organic beads having an average particle diameter of 12 m and a refractive index of 59 PB301 (styrene beads) manufactured by Sumitomo Chemical Co., Ltd. was used.
- FIG. 5 is a view showing a third embodiment of the transmission screen according to the present invention.
- the third example corresponds to the second embodiment shown in FIG. 2, and is provided on three lens sheets and an optical sheet with two fic (diffusion portions) separated by force.
- One of the two diffusion layers is provided on the surface of the lens sheet located closest to the light source (the light incident surface of the Fresnel lens sheet), and the other is located closest to the observation side. It is provided on the surface of the optical sheet (the entire panel light incident surface).
- a 2 mm-thick Fresnel lens sheet 31 made of polymethyl methacrylate and a 2 mm-thick entire panel 3 made of polymethyl methacrylate were used.
- 2 and a 1 mm thick lenticular lens sheet 3 3 made of polymethyl methacrylate and placed between Fresnel lens sheet 3 1 and front panel 3 2 Screen 30 was made.
- the Fresnel lens sheet 31 has a diffusion surface of thickness 150 with glass beads having an average particle diameter of 11 / m and a refractive index of 1.535 dispersed at 45 parts by weight on the light incident surface 3 la.
- Layer 3 OA was formed.
- the entire panel 32 has a 150 m-thick diffusion layer in which 45 parts by weight of glass beads having an average particle diameter of 11 m and a refractive index of 1.535 are dispersed on the light-entering surface 32 a. 30 B was formed.
- an impact-resistant metal acryl resin (refractive index 1.51) manufactured by Sumitomo Chemical Co., Ltd. was used.
- EMB20 manufactured by Toshiba Barloti 12 was used as glass beads having an average particle diameter of 11 m and a refractive index of 1.535.
- FIG. 6 is a view showing a fourth embodiment of the transmission screen according to the present invention.
- the fourth example corresponds to the second embodiment shown in FIG. 2, in which two expansions (diffusion portions) are provided separately on two lens sheets.
- One of the two expansions was provided on the surface of the lens sheet (the light incident surface of the Fresnel lens sheet) located closest to the light source, and the other was located closest to the side. It is provided inside the lens sheet (inside the lenticular lens sheet).
- those who are closer to the light source side have a smaller degree of light diffusion than the expansion that is closer to the view than this expansion.
- a transmission screen 40 was produced by combining a lens sheet 42 with a lenticular lens 42 in which transparent lenses 42b were formed on both sides of 42a.
- the Fresnel lens sheet 41 has a thickness of 100 m in which 35 parts by weight of glass beads having an average particle diameter of 11 m and a refractive index of 1.535 are dispersed on the light incident surface 41 a thereof.
- a diffusion layer 4 OA was formed.
- 10.0 parts by weight of organic beads having an average particle diameter of 12 m and a refractive index of 1.59 were uniformly mixed into the film 42 a (diffusion layer 40 B) of the lenticular lens sheet 42. I let it.
- the base material of the Fresnel lens sheet 41 Sumitomo Chemical Co., Ltd.
- An impact-resistant methacrylic resin (refractive index 1.51) was used.
- glass beads having an average particle diameter of 11 ⁇ m and a refractive index of 1.535 EMB20 manufactured by Toshiba Valorini Co. was used.
- organic beads having an average particle diameter of 12 m and a refractive index of 1.59 PB301 (Styrene beads) manufactured by Sumitomo Chemical Co., Ltd. was used.
- the lens sheet 42 is covered with a film 42 a over a UV (ultraviolet) curable resin or an EB (electron beam) curable resin poured into a mold having an inverted shape of the transparent lens 42 b.
- the UV-curable resin or EB-curable resin was irradiated with ultraviolet rays or electron beams.
- FIG. 7 is a view showing a fifth embodiment of the transmission screen according to the present invention.
- the fifth example corresponds to the second embodiment shown in FIG. 2, in which two lens sheets are provided with two separate (diffusion portions).
- One of the two expansions was provided on the surface of the lens sheet (the Fresnel lens sheet light entrance surface) located closest to the light source, and the other was located closest to the 13 ⁇ 4 side. It is provided on the surface of the lens sheet (the light-emitting surface of the lenticular lens sheet).
- the diffusion layer closer to the light source side has a smaller degree of light diffusion than the expansion closer to the observation side than this diffusion layer.
- a 2 mm thick Fresnel lens sheet 51 made of polymethyl methacrylate, and a 1 mm thick lenticular lens sheet 52 made of polymethyl methacrylate were used.
- the Fresnel lens sheet 51 contains 35 parts by weight of glass beads with an average particle diameter of 11 / m and a refractive index of 1.535 on the light incident surface 51a.
- the formed diffusion layer 5 OA having a thickness of 100 ⁇ was formed. Also lenticular
- a 100-im-thick leak-expanding 50B having an organic particle having an average particle diameter of 12 tzm and a refractive index of 1.59 dispersed at 12.0 parts by weight was formed on the light emitting surface 52b.
- an impact-resistant methacrylic resin (refractive index: 1.51) manufactured by Sumitomo Chemical Co., Ltd. was used.
- EMB 20 manufactured by Toshiba Valorini Co., Ltd. was used as glass beads having an average particle size of ⁇ ⁇ ⁇ ⁇ refractive index of 1.535.
- PB 3011 styrene beads manufactured by Sumitomo Chemical Co., Ltd. was used as the organic beads having an average particle diameter of 12 m and a refractive index of 1.59.
- the image was evaluated by projecting image light on the transmissive screen 50 produced in this way using an LCD projector, and it was found that the scintillation was weak and that the image had good resolution. .
- FIG. 8 is a sixth embodiment of the transparent screen according to the present invention. It is a figure showing an example.
- the sixth example corresponds to the second embodiment shown in FIG. 2, in which three lens sheets and three optical sheets are provided with three expanded IWs (diffusion portions) separated by force. .
- the three diffusion layers are respectively provided on the surface (light incident surface) of the lens sheet or the optical sheet.
- a transmissive screen 60 was produced by combining a 1 mm thick lenticular lens sheet 63 made of polymethyl methacrylate disposed between a Fresnel lens sheet 61 and a front panel 62.
- the Fresnel lens sheet 61 has a light-incident surface 61a with 3.5 parts by weight of glass beads with an average particle size of 11 ⁇ and a refractive index of 1.535 dispersed at a thickness of 100 i / m.
- a layer 6 OA was formed.
- a diffusion layer 60B having a thickness of 100 in which 3.5 parts by weight of glass beads having an average particle diameter of ll ⁇ m and a refractive index of 1.535 were dispersed was formed on the light incident surface 62a.
- the lenticular lens sheet 63 is formed on the light incident surface 63a thereof with a thickness of 30 / zm and an organic particle having a refractive index of 1.49 and a dispersion of 5.0 parts by weight to form a 30-thick expanded 60C. did.
- an impact-resistant metal acryl resin (refractive index: 1.51) manufactured by Sumitomo Chemical Co., Ltd. was used.
- glass beads having an average particle diameter of 11 ⁇ m and a refractive index of 1.535 EMB 20 manufactured by Toshiba Baroti 12 was used.
- XC01 (acrylic beads) manufactured by Sumitomo Chemical Co., Ltd. was used as the organic beads having an average particle diameter of 30 m and a refractive index of 1.49.
- the image was evaluated by projecting image light on the transmissive screen 60 produced in this way using an LCD projector.As a result, it was observed that the scintillation was weak, and the image power was good with good power and resolution. Was.
- FIG. 9A and 9B are views showing a seventh embodiment of the transmission screen according to the present invention.
- the seventh embodiment corresponds to the second embodiment shown in FIG. 2, and two lens sheets are provided with two diffusion layers (diffusion portions) separately.
- the type of diffusing agent is different between iWl near the light source side and expansion near the observation side of the two diffusion layers.
- a Fresnel lens sheet 71, 81 made of polymethyl methacrylate and a lenticular lens sheet 72, 1 mm thick made of polymethyl methacrylate, Transmissive screens 70 and 80 were produced by combining 82 and 82, respectively.
- the transmissive screens 70, 80 are provided with Fresnel lens sheets 71, 81. Have almost the same shape and structure except that the structure is different.
- Fresnel lens portions 71 and 81 were obtained by forming a Fresnel lens portion on the surface by a UV curing method using a UV curable resin containing no diffusing agent. 9A and 9B do not show the boundary between the base material and the Fresnel lens portion made of the UV curable resin.
- the Fresnel lens sheet 71 shown in FIG. 9A uses a single-layer (diffusion layer 7OA) base material in which a predetermined average particle diameter and an increase in the refractive index are uniformly mixed. It is a lens sheet having a Fresnel lens portion formed on the surface.
- the Fresnel lens sheet 81 shown in FIG. 9B has a two-layer structure in which a predetermined average particle size and a widened refractive index are dispersed on the light incident surface 8 la by coextrusion molding or the like. A lens sheet in which a Fresnel lens portion is formed on one surface using a base material.
- the diffusing agents to be added to the expanded 0 A and 80 A are: 1) Acryl beads with an average particle size of 30 ⁇ m and a refractive index of 1.49 (XC01 manufactured by Sumitomo Chemical Co., Ltd.); // m, Acryl beads with a refractive index of 1.49 (MBX manufactured by Sekisui Chemical Co., Ltd.), 3 glass beads with an average particle diameter of 17 m, refractive index of 1.535 (Toshiba Ballotini tt3 ⁇ 4E GB 210), 4average particle diameter of 12 / m Or styrene beads having a refractive index of 1/59 (PB3011 manufactured by Limb Kagaku Kogyo Co., Ltd.).
- the number (for example, “2.5 t”) attached to the right side of the type of additive indicates the thickness (mm) of the base material of the Fresnel lens sheets 71 and 81.
- the thickness of the Fresnel lens sheet 71, 81 is obtained by adding 0.2 mm to the thickness of the Fresnel lens portion formed of the UV-hardening resin.
- “(2)” attached to the right side of a number (for example, “1.8 t”) indicating the thickness (mm) of such a base material indicates the Fresnel lens sheet to which the additive is added. This indicates that the base material has a two-layer structure (the structure shown in Fig. 9B).
- the unit (P) of the concentration of the diffusing agent indicates the weight part (g number) of the expansion mixed in 100 weight parts (100 g) of polymethyl methacrylate as the base material.
- the lens Each of the light emitting lenses 72 and 82 has a diffusion layer 70 B and 80 B having a thickness of 600 i £ m in which a diffusing agent having a predetermined average particle size and refractive index is dispersed on the light emitting surfaces 72 b and 82 b. .
- the diffusing agent to be added to the expanded 170B and 80B includes: 1) glass beads with an average particle diameter of 11 ⁇ m and a refractive index of 1,535 (Toshiba Baroty II Co., Ltd. 20), 2) an average particle diameter of 17 m.
- Emb Shiva Ballotini with glass beads with a refractive index of 1.535 (EGB210 manufactured by Toshiba Ballotin 12), 3 average particle size 30 ⁇ m, acryl beads with a refractive index of 1.49 (XC01 manufactured by Sumitomo Chemical Co., Ltd.) (XC01 + EGB-1) mixed with EGB210 manufactured by Sumitomo Chemical Co., Ltd.
- these diffusing agents 1 to 3 were added to the diffusion layers 70B and 80B of the lenticular lens sheets 72 and 82 in the following manner. That is, among the diffusing agents (1) to (4), XC01 (Sumitomo Chemical Co., Ltd.) and EGB210 (Toshiba Baroiti 12) were mixed at a ratio of 6: 1. Based on the above, the concentration of EGB210 contained in this “XC01 + EGB-1” was set to 2.0P. The concentrations of the other diffusing agents (1), (2), and (4) are based on the transmission type screen that combines the lenticular lens sheet containing the diffusing agent and the XC01 2.5 t Fresnel lens sheet shown in Table 1 above. Is almost the same as the gain of a transmissive screen that combines the lenticular lens of “XC01 + EGB-1” and the Fresnel lens sheet of “XC012.5t” (0.2 ).
- MBX Acrylic beads (1 l rn ⁇ 1.49) XCO 1 + EGB-l: Blend XC 01 and EGB in 6: 1 EGB: Glass beads: (17 ⁇ n3 ⁇ 4 1.535) XCO 1 + EGB-2: XCO 1 and EGB are blended 2: 3.
- PB3011 Styrene beads (12 ⁇ 3 ⁇ 41.59)
- the combination with high evaluation of the strength and size (roughness) of the scintillation etc. is the average particle size as the diffusing agent added to the Fresnel lens sheet (FL) near the light source side.
- Acrylic beads with a refractive index of 30 ⁇ m and a refractive index of 1.49 were used, and an average particle size of 1 l was used as a diffusing agent to be added to the lenticular lens sheet (LL) near the observation side.
- ⁇ m confirm the power using glass beads with a refractive index of 1.535 (EMB20 manufactured by Toshiba Valorini Co.)
- the average particle size of the diffusing agent added to the lenticular lens sheet (LL) is between EG B210 (average particle size 17 / m) and EMB20 (average particle size 11 m), especially the average particle size.
- a significant improvement in the size (roughness) of the scintillation was observed at around 15 / m.
- Fig. 10 shows a comparative example of a transmission screen.
- a 2 mm thick Fresnel lens sheet 91 containing no dispersant made of polymethyl methacrylate and a 1 mm thick lenticular lens sheet made of polymethyl methacrylate were used.
- the transmission type screen 70 was produced by combining the filter 92.
- the lenticular lens sheet 72 (diffusion layer 90B) was uniformly mixed with 5 parts by weight of glass beads having an average particle diameter of 11 zm and a refractive index of 1.535.
- an impact-resistant methacrylic resin (refractive index 1.51) manufactured by Sumitomo Chemical Co., Ltd. was used.
- EMB20 manufactured by Toshiba Valoriti 12 Co. was used as glass beads having an average particle diameter of 11 ⁇ and a refractive index of 1.535.
- At least two diffusing portions are provided separately on one or a plurality of lens sheets or optical sheets, so that it is used in the case of a single diffusing portion. It is possible to reduce the strength of the scintillation to the same extent with a smaller amount of diffusing agent than the expanding amount. Further, by making the types of the diffusing agent used in the two diffusion sections different, it is possible to reduce the size (roughness) of the scintillation and the like as well as the strength of the scintillation and the like. Therefore, it is possible to effectively reduce the flicker of the image such as the scintillation while suppressing the decrease in the resolution and the decrease in the brightness of the image.
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- General Physics & Mathematics (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Optical Elements Other Than Lenses (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69738446T DE69738446T2 (de) | 1996-07-23 | 1997-07-23 | Rückprojektionsschirm |
EP97932990A EP0859270B1 (en) | 1996-07-23 | 1997-07-23 | Rear projection screen |
US09/029,848 US6271965B1 (en) | 1996-07-23 | 1997-07-23 | Rear projection screen having reduced scintillation |
JP50680598A JP3465906B2 (ja) | 1996-07-23 | 1997-07-23 | 透過型スクリーン |
DK97932990T DK0859270T3 (da) | 1996-07-23 | 1997-07-23 | Bagsideprojektionsskærm |
US10/638,222 USRE40226E1 (en) | 1996-07-23 | 2003-08-07 | Rear projection screen having reduced scintillation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19303996 | 1996-07-23 | ||
JP8/193039 | 1996-07-23 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09029848 A-371-Of-International | 1997-07-23 | ||
US09/879,121 Continuation US6400504B2 (en) | 1996-07-23 | 2001-06-13 | Rear projection screen having reduced scintillation |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998003898A1 true WO1998003898A1 (fr) | 1998-01-29 |
Family
ID=16301156
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/002546 WO1998003898A1 (fr) | 1996-07-23 | 1997-07-23 | Ecran de projection arriere |
Country Status (7)
Country | Link |
---|---|
US (2) | US6271965B1 (ja) |
EP (1) | EP0859270B1 (ja) |
JP (1) | JP3465906B2 (ja) |
KR (1) | KR100443762B1 (ja) |
DE (1) | DE69738446T2 (ja) |
DK (1) | DK0859270T3 (ja) |
WO (1) | WO1998003898A1 (ja) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002517800A (ja) * | 1998-06-11 | 2002-06-18 | スリーエム イノベイティブ プロパティズ カンパニー | 背面投射システム |
JP2003114481A (ja) * | 2001-10-05 | 2003-04-18 | Mitsubishi Electric Corp | 透過型スクリーンおよび投写型表示装置 |
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- 1997-07-23 JP JP50680598A patent/JP3465906B2/ja not_active Expired - Fee Related
- 1997-07-23 DE DE69738446T patent/DE69738446T2/de not_active Expired - Fee Related
- 1997-07-23 EP EP97932990A patent/EP0859270B1/en not_active Expired - Lifetime
- 1997-07-23 WO PCT/JP1997/002546 patent/WO1998003898A1/ja active IP Right Grant
- 1997-07-23 US US09/029,848 patent/US6271965B1/en not_active Expired - Lifetime
- 1997-07-23 KR KR10-1998-0702056A patent/KR100443762B1/ko not_active IP Right Cessation
- 1997-07-23 DK DK97932990T patent/DK0859270T3/da active
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2003
- 2003-08-07 US US10/638,222 patent/USRE40226E1/en not_active Expired - Lifetime
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002517800A (ja) * | 1998-06-11 | 2002-06-18 | スリーエム イノベイティブ プロパティズ カンパニー | 背面投射システム |
US7164224B2 (en) | 2000-12-14 | 2007-01-16 | Sharp Kabushiki Kaisha | Backlight having discharge tube, reflector and heat conduction member contacting discharge tube |
US7169005B2 (en) | 2000-12-14 | 2007-01-30 | Sharp Kabushiki Kaisha | Method of producing a backlight having a discharge tube containing mercury |
US7309146B2 (en) | 2000-12-14 | 2007-12-18 | Sharp Kabushiki Kaisha | Backlight having discharge tube, reflector and heat conduction member contacting discharge tube |
US7541723B2 (en) | 2000-12-14 | 2009-06-02 | Sharp Kabushiki Kaisha | Backlight having a polarization separating element |
JP2003114481A (ja) * | 2001-10-05 | 2003-04-18 | Mitsubishi Electric Corp | 透過型スクリーンおよび投写型表示装置 |
JP2006504997A (ja) * | 2002-11-05 | 2006-02-09 | レーム ゲゼルシャフト ミツト ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフト | リアプロジェクションスクリーン及びその製法 |
US7715096B2 (en) | 2004-02-26 | 2010-05-11 | Dai Nippon Printing Co., Ltd. | Light diffusing screen |
JP2006234981A (ja) * | 2005-02-22 | 2006-09-07 | Toppan Printing Co Ltd | 透過型スクリーン |
Also Published As
Publication number | Publication date |
---|---|
EP0859270A4 (en) | 2001-12-19 |
KR20000064254A (ko) | 2000-11-06 |
KR100443762B1 (ko) | 2004-10-08 |
DK0859270T3 (da) | 2008-02-04 |
JP3465906B2 (ja) | 2003-11-10 |
EP0859270B1 (en) | 2008-01-09 |
DE69738446D1 (de) | 2008-02-21 |
US6271965B1 (en) | 2001-08-07 |
DE69738446T2 (de) | 2009-01-15 |
USRE40226E1 (en) | 2008-04-08 |
EP0859270A1 (en) | 1998-08-19 |
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