WO2018196386A1 - 一种激光投影屏幕和投影系统 - Google Patents

一种激光投影屏幕和投影系统 Download PDF

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Publication number
WO2018196386A1
WO2018196386A1 PCT/CN2017/114845 CN2017114845W WO2018196386A1 WO 2018196386 A1 WO2018196386 A1 WO 2018196386A1 CN 2017114845 W CN2017114845 W CN 2017114845W WO 2018196386 A1 WO2018196386 A1 WO 2018196386A1
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WO
WIPO (PCT)
Prior art keywords
optical film
magnet
projection screen
laser projection
screen according
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Application number
PCT/CN2017/114845
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English (en)
French (fr)
Inventor
杨长明
田新团
张王军
贾昌明
Original Assignee
青岛海信电器股份有限公司
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Publication of WO2018196386A1 publication Critical patent/WO2018196386A1/zh

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    • 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

Definitions

  • the present invention relates to the field of laser projection equipment, and in particular, to a laser projection screen and a projection system.
  • Laser TV has developed rapidly due to its wide color gamut, high brightness, long service life, energy saving and environmental protection.
  • the laser television includes a projector (laser) and a projection screen for use with the projector.
  • the projection screen is usually mounted on a wall, and the light projected by the projector onto the projection screen is reflected by the projection screen and then enters along the set optical path. In the eyes of the audience, the image is produced.
  • the projection screens on the market mainly include soft screens and hard screens.
  • laser TVs mainly use hard screens
  • the structure of hard screens usually includes rigid back sheets and optical films attached to rigid back sheets.
  • the rigid backing plate provides effective support for the optical diaphragm.
  • the present invention provides a laser projection screen comprising a backing plate and an optical film laminated with the backing plate, the backing plate being made of a magnetic material, the optical film being fixed on a surface adjacent to the backing plate a magnet, the optical film being adsorbed on the backing plate by the magnet.
  • the present invention also provides a projection system comprising a projector and a laser projection screen, wherein the laser projection screen is a laser projection screen as described in the above technical solution.
  • FIG. 1 is a schematic structural view of a laser projection screen according to an embodiment of the present invention.
  • Figure 2 is a partial enlarged view of a region A in the laser projection screen shown in Figure 1;
  • FIG. 3 is a schematic structural view of a backboard in a laser projection screen according to an embodiment of the present invention.
  • FIG. 4 is an exploded view of a laser projection screen according to an embodiment of the present invention.
  • Figure 5 is a partial enlarged view of a region B in the laser projection screen shown in Figure 1.
  • FIG. 1 , FIG. 2 and FIG. 5 are schematic diagrams of an embodiment of a laser projection screen according to an embodiment of the present invention.
  • the laser projection screen of the embodiment includes a backboard 1 and is laminated with the back panel 1 .
  • An optical film 2 is provided, the back plate 1 being made of a magnetic material, As shown in FIG. 2, a magnet 4 is fixed to the surface of the optical sheet 2 near the back sheet 1, and the optical film 2 is adsorbed on the back sheet 1 by the magnet 4.
  • a laser projection screen provided by the present invention referring to FIG. 2, since the optical film 2 is adsorbed on the back plate 1 by the magnet 4, the magnet 4 can be slightly slipped on the back plate 1, so that the projection screen is heated or subjected to When cold, the optical film 2 can apply a thrust parallel to the backing plate 1 to the magnet 4 to push the magnet 4 to move slightly on the backing plate 1, thereby avoiding the wrinkling of the optical film 2 on the backing plate 1.
  • a sealed gas region is not formed, so the gap between the optical film 2 and the back plate 1 is applied when the projection screen is applied to a low pressure region.
  • the air pressure and the ambient air pressure can be kept consistent, thereby avoiding the phenomenon of plateau bulging on the surface of the optical film 2, thereby maintaining the surface flatness of the screen even in a harsh environment such as high temperature, high cold or low air pressure.
  • the optical film 2 is adsorbed on the back plate 1 by the magnet 4, the optical film 2 and the back plate 1 are easily disassembled or installed. Therefore, when the laser projection screen is transported, the back plate 1 and the optical film 2 can be respectively separated. The transport can be carried out when the user arrives at the user, thereby reducing the transport weight and the transport volume during a single transport, thereby reducing the difficulty of handling and entering the screen.
  • the magnetic material refers to a material that can be adsorbed by the magnet.
  • the magnetic material may be iron, cobalt, nickel, or an alloy thereof, which is not specifically limited herein.
  • the alloy of iron and iron is a magnetic material commonly used in the field of mechanical technology, and is inexpensive
  • the back sheet 1 is made of an alloy of iron or iron to save cost and reduce the back sheet 1. Difficult to make.
  • the back plate 1 is made of an electrolytic lead-lead galvanized steel plate or a steel-plastic plate, and the electrolytic lead-lead galvanized steel plate and the steel-plastic plate are ferromagnetic materials, and have good rust and corrosion resistance, and can improve the back plate.
  • the rust and corrosion resistance of 1 can extend the service life of the backboard 1. Since the price of the steel-plastic panel is cheaper than that of the electrolytic lead-lead galvanized steel sheet, in some embodiments, in order to reduce the cost of the back sheet 1, the back sheet 1 may be made of a steel-plastic panel.
  • the thickness of the back plate 1 is not specifically limited, but in order to ensure the structural strength of the back plate 1 and at the same time, in order to reduce the weight of the back plate 1 as much as possible, in some embodiments
  • the thickness of the back sheet 1 is 0.35 mm
  • the thickness of the back sheet 1 is 4 mm.
  • the magnet 4 may be a strip structure, a block structure, a disk structure, or the like, and is not specifically limited herein. However, in order to increase the magnetic force coverage of the magnet 4, in some embodiments, the magnet 4 has a strip structure.
  • the back plate 1 may be a rigid whole body or may be formed by splicing a plurality of back plate units, which is not specifically limited herein.
  • the backboard 1 when the backboard 1 is a rigid whole, the backboard 1 has a large volume and weight, which is difficult to carry and enter the user's home, which will seriously restrict the development of the entire projection industry, in order to avoid this problem.
  • the backboard 1 is formed by splicing a plurality of flat-shaped backplane units 11, and at least one backplane unit 11 can be connected to the wall through a fixing member (not shown). .
  • the plurality of backboard units 11 constituting the backboard 1 can be packaged in a small-sized package box, thereby reducing the difficulty of entering the backboard 1 and at the same time
  • the plurality of backboard units 11 can be transported to the user in batches, thereby reducing the transport weight at the time of single transport, thereby reducing the difficulty of handling and entering the backboard 1.
  • a part of the backboard unit 11 may be fixed to the wall by a fixing member, and the other backboard units 11 may be detachably connected to the backboard unit 11 fixed to the wall, or the plurality of backboard units 11 may be fixed by the fixing members.
  • the fixing members On the wall, no specific limitation is made here.
  • a plurality of backplane units 11 are fixed to the wall by fasteners.
  • the number of the backplane units 11 included in the backplane 1 may be four, six, eight, etc., and is not specifically limited herein.
  • the backplane 1 having a length and a width of 100 inches can be used in a 2 ⁇ 2 splicing manner on the wall by using four backplane units 11 each having a length and a width of 50 inches. Stitched together.
  • the backplane unit 11 may be a rectangle, a square, a triangle, or the like, and is not specifically limited herein.
  • the shape of the backboard unit 11 is a square structure (which may be rectangular or square). , the shape of the square structure is simple Single, the production is less difficult, and the stitching is convenient.
  • the back plate 1 in order to effectively support the optical film to prevent local collapse of the optical film, in some embodiments, as shown in FIGS. 1 and 2, the back plate 1 is disposed adjacent to one side of the optical film 2. There is a support layer 3, and a position of the corresponding magnet 4 on the support layer 3 is provided with a relief hole 5, and the magnet 4 is adsorbed on the back plate 1 after passing through the escape hole 5, so that the optical film 2 is effectively supported by the support layer 3, thereby preventing The area of the optical film 2 where the magnet 4 is not fixed causes partial collapse, which further ensures the flatness of the surface of the projection screen.
  • the supporting layer 3 can be sandwiched between the optical film 2 and the backing plate only by the magnetic attraction between the magnet 4 and the backing plate 1. Between the two, the surface of the back sheet 1 is close to the surface of the optical film 2 or the back surface of the optical film 2, which is not specifically limited.
  • the support layer 3 may be made of a hard material or an elastic material, and is not specifically limited herein.
  • the support layer 3 is made of a hard material, so that if the back plate unit 11 or the wall is partially uneven or the edge of the back plate unit 11 is lifted, it will be affected.
  • the flatness of the surface of the support layer 3 away from the side of the back sheet 1 affects the flatness of the optical film 2.
  • the support layer 3 is made of an elastic material, and the thickness of the support layer 3 in the free state is greater than the thickness of the magnet 4, thus, the optical film 2 is pressed.
  • the support layer 3 When connected to the support layer 3, the support layer 3 is compressively deformed to generate an elastic supporting force to the optical film 2 to balance the pressure of the optical film 2 against the support layer 3, so that the optical film 2 is in a flat state.
  • the support layer 3 is an elastic material, the wall is partially uneven or the edge of the back plate unit 11 is lifted only to have a large influence on the flatness of the surface of the support layer 3 near the back plate 1, and the support layer 3 is The surface away from the side of the back sheet 1 has less influence, thereby reducing the influence of the flatness of the back sheet unit 11 or the flatness of the wall or the edge of the back sheet 1 on the flatness of the optical film 2.
  • the support layer 3 may be made of foam, rubber or the like, and is not specifically limited herein. However, since the foam has good compressibility, high resilience and low cost, the support layer 3 can be made of foam.
  • the elastic force generated by the support layer 3 on the optical film 2 due to compression and the optical film 2 are opposite to the support layer.
  • the pressure of 3 needs to be balanced. If the elastic force of the support layer 3 on the optical film 2 is too large, it may easily cause a bulge on the surface of the optical film 2, or the magnet 4 may not be attracted to the back plate 1, if the support layer 3 If the elastic force of the optical film 2 is too small, the optical film 2 cannot be effectively supported, and the optical film 2 is likely to be collapsed and deformed.
  • the thickness of the support layer 3 in the free state is h 1
  • the thickness of the magnet 4 is h 2
  • ⁇ h h 1 - h 2
  • 0.3 mm ⁇ ⁇ h ⁇ 0.5 mm when ⁇
  • h less than 0.3 mm, the compression amount of the support layer 3 is small, the elastic force generated is small, and the optical film 2 cannot be effectively supported; and when ⁇ h is larger than 0.5 mm, the compression amount of the support layer 3 is large.
  • the elastic force generated is large, and the tying of the surface of the optical film 2 is liable to occur, or the magnet 4 on the surface of the optical film 2 near the backing plate 1 cannot be effectively absorbed onto the backing plate 1.
  • the optical film generally used in the prior art includes a film body having light transmissive properties and a light reflecting layer disposed on the back surface of the film body, the light reflecting layer reflects the light emitted by the projection light source to be incident on the viewer's eyes. Therefore, the reflective layer is very important.
  • the reflective layer is usually formed on the back surface of the optical film by a coating process. In order to prevent the projection screen from being too thick, the thickness of the reflective layer is thin, and the uniformity during coating is difficult to be ensured, which is easy to cause.
  • the reflective layer cannot completely reflect the light from the projection light source, and some of the light can still pass through the reflective layer into the back side of the optical film, so that the user can still see the back plate on the back side of the optical film from the front side of the optical film. , thus affecting the quality of the viewing.
  • the light reflecting layer is formed on the back surface of the optical film by a coating process, the bonding force between the inside of the light reflecting layer and the light reflecting layer and the optical film is weak, so if the light reflecting layer is directly exposed on the back surface of the optical film, The reflective layer is easily scratched by hard objects during transportation and installation.
  • the optical film 2 of the embodiment of the invention may be fabricated as shown in FIG. 2, that is, referring to FIG. 2, the optical film 2 includes a diaphragm main body 21, a light reflecting layer 22, and a light absorbing layer 23, and the diaphragm main body 21 is made of a light transmissive material, the reflective layer 22 is disposed on the surface of the diaphragm main body 21 facing the back plate 1, and the light absorbing layer 23 is disposed on the reflective layer 22 away from the diaphragm main body 21. One side and cover the reflective layer 22.
  • the light passing through the diaphragm main body 21 and the light reflecting layer 22 from the front surface of the optical film 2 is absorbed by the light absorbing layer 122, effectively preventing the user from seeing the back side of the optical film 2 from the front side of the optical film 2.
  • Backplane 1 thus ensuring the quality of viewing.
  • the light absorbing layer 23 covers the light reflecting layer 22, the light absorbing layer 23 can protect the light reflecting layer 22, and the light reflecting layer 22 is directly exposed to the external environment, thereby reducing the light reflecting layer 22 being hardened during transportation and installation. The possibility of scratching.
  • the light absorbing layer 23 in order to provide the light absorbing layer 23 with superior light absorbing properties, should be made of a dark material such as black or dark brown, and the light absorbing layer 23 can be a single-sided adhesive, paint, or PET (Polyethylene Terephthalate, The polyethylene terephthalate film, the screen printing ink, and the like are not specifically limited herein.
  • the black single-sided foam is a commonly used material in the mechanical field, and has good light-shielding performance and excellent scratch resistance, in some embodiments, referring to FIG. 2, the light-absorbing layer 23 is a black single-sided foam.
  • the black single-faced foam rubber is adhered to the light-reflecting layer 22 through the rubberized surface thereof, and the adhesion of the black single-sided foam rubber can reduce the dimensional change caused by the expansion and contraction of the diaphragm main body 21.
  • the fixing member in order to connect the backboard unit 11 to the wall, may be a screw or a buckle or the like, which is not specifically limited herein.
  • the backboard unit 11 is connected to the wall by screws. As shown in FIG.
  • the backboard unit 11 is provided with a through hole 6 on which a threaded hole is formed at a position opposite to the through hole 6 ( Not shown in the drawings), the fixing member is a screw through which the screw is mated with the threaded hole to connect the backboard unit 11 to the wall, whereby the connection of the backboard unit 11 to the wall is achieved by the screw.
  • the number of the vias 6 disposed on the backplane unit 11 may be one or more, which is not specifically limited herein.
  • the backboard unit 11 is provided with a plurality of via holes 6 through which a plurality of screws pass through The hole 6 can fix the backboard unit 11 to the wall with higher reliability.
  • the plurality of via holes 6 can be uniformly opened.
  • the backplane unit 11 is disposed at a central position of the backplane unit 11, and the plurality of vias 6 are disposed at the edge of the backplane unit 11 and are not specifically limited herein.
  • the via 6 includes a via 6 which is opened at the center of the backboard unit 11.
  • the edge positions of the backboard unit 11 can be fixed to the wall by a plurality of screws respectively passing through the plurality of through holes 6 formed at the edge positions of the backboard unit 11 to realize the backplane unit 11 Effectively fixed while preventing the edge of the backboard unit 11 from being lifted.
  • the via hole 6 may include a via hole 6 opened at a center position of the backboard unit 11, and four corners opened at the edge of the backboard unit 11.
  • the four via holes 6 thereby effectively fix the backboard unit 11 to the wall while preventing the four corners of the edge of the backboard unit 11 from being lifted.
  • the number of the magnets 4 fixed on the surface of the optical film 2 near the back plate 1 may be one or more, which is not specifically limited herein.
  • the optical film 2 is fixed with a plurality of magnets 4 on the surface of the back sheet 1, passing through The plurality of magnets 4 fix the optical film 2 to the backing plate 1 for higher reliability.
  • the plurality of magnets 4 When the plurality of magnets 4 are fixed on the surface of the optical film 2 near the back plate 1, the plurality of magnets 4 may be uniformly fixed on the surface of the optical film 2 near the back plate 1, or may be partially fixed to the optical film 2 In the middle portion of the surface of the back sheet 1, the other portion is fixed to the edge position of the optical film 2 near the surface of the back sheet 1, and is not particularly limited herein.
  • the magnet 4 is disposed on the optical film 2 near the backing plate.
  • first magnet 41 in a central portion of the surface of the surface, and a second magnet 42 disposed at an edge position of the optical film 2 near the surface of the backing plate 1, whereby the central portion of the optical film 2 can be passed through the first magnet 41
  • the area is fixed on the backboard 1, and at the same time, the edge position of the optical film diaphragm can be fixed to the backboard 1 by the second magnet 42.
  • the optical film 2 is effectively fixed to the back sheet 1 while preventing the edge of the optical film 2 from being lifted.
  • the plurality of second magnets 42 are plural, and the plurality of second magnets 42 are uniformly disposed around the edge of the optical film 2 near the surface of the backing plate 1 to prevent the edges of the optical film 2 from being lifted up one week.
  • the optical film 2 in order to effectively prevent the edge of the optical film 2 from being lifted, and in order to reduce the area of the attachment area of the magnet 4, in some embodiments, the optical film 2 is close to the surface of the back sheet 1.
  • the distance L between the second magnet 42 and the edge of the reference surface adjacent to the second magnet 42 is 5 mm to 10 mm, and the distance between the second magnet 42 and the edge of the second magnet 42 on the reference surface is within this range, the edge of the optical film 2 can be effectively prevented from being lifted, and the area of the attached area of the magnet can be reduced, so that the number of the magnets 4 to be attached can be reduced.
  • the distance between the second magnet 42 and the edge of the reference surface close to the second magnet 42 is less than 5 mm, the distance between the second magnet 42 and the edge of the reference surface adjacent to the second magnet 42 is small, The surface of the magnet 4 on the surface is large, and the number of magnets 4 to be disposed is large and the cost is high on the premise of reaching the density of the same magnet 4.
  • the second magnet 42 and the reference surface are close to the second magnet
  • the distance between the edges of 42 is greater than 10 mm, the distance between the second magnet 42 and the edge of the reference surface close to the second magnet 42 is large, and the edge of the optical film 2 has no strength and is easily lifted.
  • the first magnet 41 is a strip magnet, and the long side of the first magnet 41 is disposed along the width direction of the optical film.
  • the first magnet 41 can effectively support the optical film 2 in the width direction of the optical film 2, reducing the possibility that the optical film 2 is shrunk in the width direction by an external force, thereby improving the screen surface. Flatness.
  • the first magnet 41 may be a strip-shaped whole extending in the width direction of the optical film 2, or may include a plurality of magnetic strip segments spaced apart along the width direction of the optical film 2, which is not specifically limited.
  • the first magnetic The iron 41 includes a plurality of magnetic strip segments 411 which are spaced apart in the width direction of the optical film 2. In this way, the material of the first magnet 41 can be reduced, thereby reducing the material cost of the first magnet 41.
  • the length of the single magnetic strip section 411 is short, and the magnetic adsorption force can be generated weakly, so that the optical film 2 is When heated or cooled, the magnetic strip section 411 can be pushed to smoothly slide on the backing plate 1 along the width direction of the optical film 2.
  • the plurality of magnetic strip segments 411 may be uniformly disposed along the width direction of the optical film 2 or may be non-uniformly disposed, and are not specifically limited herein.
  • the magnetic strip section 411 in order to stably adsorb the optical film 2 onto the back sheet 1, and in order to ensure that the magnetic strip section 411 can smoothly slide on the back sheet 1, in some embodiments, as shown in FIG.
  • the adsorption force between the magnetic strip section 411 and the backing plate 1 is 60-80 N.
  • the optical film 2 can be stably adsorbed to the back.
  • the magnetic strip section 411 can be smoothly slid on the backing plate 1 under the action of the thrust of the optical curtain 12.
  • the spacing between adjacent two magnetic strip segments 411 is 250-300 mm, and the width along the optical film 2 is when the spacing between adjacent two magnetic strip segments 411 is less than 250 mm.
  • the density of the magnetic strip segments 411 disposed in the direction is large, and the optical film 2 cannot smoothly slide along the width direction of the optical film 2 when heated or cooled; when the spacing between adjacent two magnetic strip segments 411 is greater than 300 mm At the time, the density of the magnetic strip segments 411 disposed along the width direction of the optical film 2 is small, and the optical film 2 cannot be effectively supported in the width direction of the optical film 2.
  • the plurality of first magnets 41 are plural, and the plurality of first magnets 41 are spaced apart along the height direction of the optical film 2. Thereby, the optical film 2 is attracted to the back sheet 1 through the plurality of first magnets 41, thereby improving the connection stability between the central portion of the optical film 2 and the back sheet 1.
  • the lower edge of the back plate 1 is bent and extended forward to form a stop portion 7, an optical film.
  • the bottom of the sheet 2 is located above the stop portion 7.
  • the stopper portion 7 can prevent the optical film sheet 2 from falling downward by an external force.
  • a frame 8 covering the edge of the back plate 1 and the optical film 2 is further included, and the frame 8 includes the first frame. a side wall 81 and a second side wall 82 perpendicular to the first side wall, the first side wall 81 is fixed to the edge of the surface of the optical film 2 away from the back plate 1, and the second side wall 82 is shielded from the optical film 2 and the back side
  • the side wall of the panel 1 is thereby decorated by the frame 8 and blocks the edges of the back panel 1 and the optical film 2, since the optical film 2 has been effectively adsorbed on the back panel 1 by the magnet 4 in the embodiment of the invention. Therefore, it is no longer necessary to fix the relative position between the optical film 2 and the back plate 1 through the frame 8, so that the frame 8 is only used for decoration and shielding, and the width of the first side wall 81 can be made narrow to achieve a narrow frame. design.
  • the first side wall 81 can be adhered to the edge of the surface of the optical film 2 away from the back plate 1 by double-sided tape 9, solid glue, glue or the like as shown in FIG. 2 or FIG. 5, or can be connected to the optical body by screws.
  • the edge of the diaphragm 2 away from the surface of the backboard 1 is not specifically limited herein.
  • the frame 8 may be made of a material such as plastic or aluminum, and is not specifically limited herein.
  • Embodiments of the present invention also provide a projection system including a projector and a laser projection screen, wherein the laser projection screen is a laser projection screen as described in the above technical solution.
  • the laser projection screen used in the projection system of the present embodiment is the same as the laser projection screen provided in the respective embodiments of the above-described laser projection screen, both can solve the same technical problem and achieve the same expected effect.

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Abstract

一种激光投影屏幕和投影系统，涉及激光投影设备技术领域。为解决现有技术中激光投影屏幕在高温、低冷或低气压等恶劣环境下难以保持其表面平整度的问题而提出。激光投影屏幕包括背板（1）以及与背板（1）层叠设置的光学膜片（2），背板（1）由磁性材料制作，光学膜片（2）靠近背板（1）的表面上固定有磁铁（4），光学膜片（2）通过磁铁（4）吸附于背板（1）上。激光投影屏幕可用于将激光器发出的光线反射至观众眼中。

Description

一种激光投影屏幕和投影系统
本申请要求于2017年04月25日提交中国专利局、申请号为201710279245.6、发明名称为“一种激光投影屏幕”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及激光投影设备技术领域，尤其涉及一种激光投影屏幕和投影系统。
背景技术
激光电视因其具有色域广、亮度高、使用寿命长、节能和环保等优点而得到飞速发展。激光电视包括投影仪(激光器)及与投影仪配合使用的投影屏幕，使用时，投影屏幕通常安装在墙壁上，投影仪投射到投影屏幕上的光经投影屏幕反射后沿设定的光路射入到观众眼中，从而产生影像。
目前，市场上的投影屏幕主要包括软屏幕和硬屏幕两种，其中，激光电视采用的主要是硬屏幕，硬屏幕的结构通常包括刚性背板和贴设于刚性背板上的光学膜片，刚性背板能够对光学膜片进行有效支撑。
发明内容
本发明提供了一种激光投影屏幕，包括背板以及与所述背板层叠设置的光学膜片，所述背板由磁性材料制作，所述光学膜片靠近所述背板的表面上固定有磁铁，所述光学膜片通过所述磁铁吸附于所述背板上。
本发明还提供了一种投影系统，包括投影机和激光投影屏幕，其中，所述激光投影屏幕为如上技术方案所述的激光投影屏幕。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于 本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例激光投影屏幕的结构示意图；
图2为图1所示激光投影屏幕中区域A的局部放大图；
图3为本发明实施例激光投影屏幕中背板的结构示意图；
图4为本发明实施例激光投影屏幕的爆炸图；
图5为图1所示激光投影屏幕中区域B的局部放大图。
附图标记：
1－背板；11－背板单元；2－光学膜片；21－膜片主体；22－反光层；23－吸光层；3－支撑层；4－磁铁；41－第一磁铁；411－磁条段；42－第二磁铁；5－避让孔；6－过孔；7－止挡部；8－边框；81－第一侧壁；82－第二侧壁；9－双面胶带。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
在本发明的描述中，需要理解的是，术语“中心”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。在本发明的描述中，除非另有说明，“多个”的含义是两个或两个以上。
参见图1、图2和图5，图1、图2和图5为本发明实施例激光投影屏幕的一个实施例，本实施例的激光投影屏幕包括背板1以及与所述背板1层叠设置的光学膜片2，所述背板1由磁性材料制作， 如图2所示，所述光学膜片2靠近所述背板1的表面上固定有磁铁4，所述光学膜片2通过所述磁铁4吸附于所述背板1上。
本发明提供的一种激光投影屏幕，参见图2，由于光学膜片2通过磁铁4吸附于背板1上，磁铁4可在背板1上产生轻微的滑移，因此在投影屏幕受热或受冷时，光学膜片2可向磁铁4施加一个平行于背板1的推力，以推动磁铁4在背板1上产生轻微的移动，从而避免了光学膜片2在背板1上出现褶皱现象，同时，由于光学膜片2通过磁铁4吸附于背板1上，不会形成密封的气体区域，因此在将投影屏幕应用到低气压地区时，光学膜片2与背板1之间的间隙气压与外界环境气压能够保持一致，从而避免了光学膜片2表面出现高原鼓包的现象，由此即使在高温、高冷或低气压等恶劣环境下，仍能够保持屏幕的表面平整度。
由于光学膜片2通过磁铁4吸附于背板1上，光学膜片2与背板1之间拆卸或安装方便，因此，在搬运激光投影屏幕时，可将背板1和光学膜片2分别搬送，而在到达用户处时再进行安装即可，从而减小了单次搬送时的搬送重量和搬送体积，进而降低了屏幕的搬运及入户难度。
在上述实施例中，磁性材料是指能够被磁铁吸附的材料，在一些实施例中，磁性材料可以为铁、钴、镍及其合金，在此不做具体限定。其中，由于铁及铁的合金为机械技术领域中常用的磁性材料，且价格低廉，因此，在一些实施例中，背板1由铁或铁的合金制作，以节省成本，降低背板1的制作难度。在一些实施例中，背板1由电解亚铅镀锌钢板或钢塑板制作，电解亚铅镀锌钢板和钢塑板属于铁磁性材料，且防锈耐腐蚀性能较好，能够提高背板1的防锈耐腐蚀能力，从而能够延长背板1的使用寿命。由于相比于电解亚铅镀锌钢板，钢塑板的价钱便宜，在一些实施例中，为了降低背板1的成本，背板1可选用钢塑板制作。
其中，对背板1的厚度不做具体限定，但是为了保证背板1的结构强度，同时为了尽可能地减小背板1的重量，在一些实施例 中，当背板由电解亚铅镀锌钢板制作时，背板1的厚度为0.35毫米，当背板由钢塑板制作时，背板1的厚度为4毫米。
另外，磁铁4可以为条状结构、块状结构、盘状结构等等，在此不做具体限定。但是，为了提高磁铁4的磁吸力覆盖范围，在一些实施例中，磁铁4为条状结构。
在图1所示实施例中，背板1可以为一个刚性整体，也可以由多个背板单元拼接而成，在此不做具体限定。但是，当背板1为一个刚性整体时，背板1的体积和重量均较大，在搬运以及进入用户家中时比较困难，这将对整个投影产业的发展产生严重的制约，为了避免此问题，在一些实施例中，如图3所示，背板1由多个平板状的背板单元11拼接而成，至少一个背板单元11能够通过固定件(图中未示出)与墙壁连接。采用背板单元的设计，在搬送背板1时，可将组成背板1的多个背板单元11包装于一个尺寸较小的包装盒内，从而降低了背板1的入户难度，同时多个背板单元11可分批次搬送至用户处，从而减小了单次搬送时的搬送重量，由此降低了背板1的搬运及入户难度。
其中，可以一部分背板单元11通过固定件固定在墙壁上，其他的背板单元11与这些固定在墙壁上的背板单元11可拆卸连接，也可以多个背板单元11均通过固定件固定在墙壁上，在此不做具体限定。为了保证背板1的结构稳定性，在一些实施例中，多个背板单元11均通过固定件固定在墙壁上。
另外，背板1所包括的背板单元11的数量可以为4个、6个、8个等等，在此不做具体限定。在一些实施例中，如图3所示，长度和宽度均为100寸的背板1，可以采用4个长度和宽度均为50寸的背板单元11在墙壁上以2×2的拼接方式拼接而成。
再者，背板单元11可以为长方形、正方形、三角形等等，在此不做具体限定。但是，为了便于背板单元11的拼接，同时减小背板单元11的制作难度，在一些实施例中，如图3所示，背板单元11的形状为方形结构(可以为长方形或正方形)，方形结构的形状简 单，制作难度较低，且拼接方便。
在一些实施例中，为了有效支撑光学膜片，以防止光学膜片的局部产生塌陷，在一些实施例中，如图1和图2所示，背板1靠近光学膜片2的一侧设有支撑层3，支撑层3上对应磁铁4的位置开设有避让孔5，磁铁4穿过避让孔5后吸附在背板1上，这样，通过支撑层3有效支撑了光学膜片2，防止了光学膜片2上未固定磁铁4的区域产生局部塌陷，进一步保证了投影屏幕的表面平整度。
其中，为了实现支撑层3与光学膜片2以及背板1之间的相对位置固定，支撑层3可以仅依靠磁铁4与背板1之间的磁吸力夹设于光学膜片2与背板1之间，也可以通过双面胶、卡接结构、螺钉等连接结构连接于背板1靠近光学膜片2的表面或光学膜片2的背面上，在此不做具体限定。
另外，支撑层3可以由硬质材料制作，也可以由弹性材料制作，在此不做具体限定。但是，当采用上述第一种方案时，也即是，支撑层3由硬质材料制作，这样，若背板单元11或墙体局部不平整或者背板单元11的边沿翘起，则会影响到支撑层3远离背板1的一侧表面的平整度，进而影响到光学膜片2的平整度。为了避免上述问题，在一些实施例中，如图1所示，支撑层3由弹性材料制作，且支撑层3在自由状态时的厚度大于磁铁4的厚度，这样，在将光学膜片2压接于支撑层3上时，支撑层3压缩变形而对光学膜片2产生弹性支撑力，以平衡光学膜片2对支撑层3的压力，使光学膜片2处于平整状态。同时，由于支撑层3为弹性材料，因此墙体局部不平整或者背板单元11的边沿翘起仅会对支撑层3靠近背板1的表面的平整度产生较大影响，而对支撑层3远离背板1一侧的表面产生的影响较小，从而减小了背板单元11或墙体平整度局部不良或背板1边沿翘起对光学膜片2的平整度的影响。
在上述实施例中，参见图1，支撑层3可以由泡棉、橡胶等材料制作，在此不做具体限定，但是，由于泡棉的可压缩性好、回弹性高且价格低廉，因此，支撑层3可以由泡棉制作。
另外，需要说明的是，参见图1，在光学膜片2压紧支撑层3并处于平整状态时，支撑层3因压缩而对光学膜片2产生的弹性力与光学膜片2对支撑层3的压力需保持平衡，若支撑层3对光学膜片2的弹性力过大，则容易导致光学膜片2的表面出现鼓包，或者导致磁铁4不能与背板1吸合，若支撑层3对光学膜片2的弹性力过小，则不能对光学膜片2形成有效支撑，从而容易导致光学膜片2塌陷变形。为此，在一些实施例中，支撑层3在自由状态时的厚度为h1，磁铁4的厚度为h2，△h＝h1－h2，0.3mm≤△h≤0.5mm，当△h小于0.3mm时，支撑层3的压缩量较小，产生的弹性力较小，不能对光学膜片2形成有效的支撑；而当△h大于0.5mm时，支撑层3的压缩量较大，产生的弹性力较大，容易导致光学膜片2的表面出现鼓包，或者使光学膜片2靠近背板1的表面上的磁铁4不能有效吸合于背板1上。
由于现有技术中通常使用的光学膜片包括具有透光性能的膜片主体以及设置于膜片主体背面上反光层，此反光层可反射投影光源发出的光线，使其射入到观众眼中，因此反光层非常重要。现有技术中，反光层通常通过涂镀工艺成型于光学膜片的背面，为了防止投影屏幕过厚，此反光层涂镀的厚度较薄，且涂镀时的均匀性难以得到保证，容易导致反光层不能完全反射投影光源发出的光，一部分光仍能够透过反光层进入光学膜片的背侧，这样，用户仍能够由光学膜片的前侧看到位于光学膜片背侧的背板，从而影响了观影质量。而且，由于此反光层通过涂镀工艺成型于光学膜片的背面，反光层内部以及反光层与光学膜片之间的结合力较弱，因此若直接将反光层暴露于光学膜片的背面，则在运输安装过程中，反光层容易被硬物划伤。
在一些实施例中，发明实施例光学膜片2可以制作为如图2所示结构，即，参见图2，光学膜片2包括膜片主体21、反光层22和吸光层23，膜片主体21由透光材料制作，反光层22设置于膜片主体21朝向背板1的表面上，吸光层23设置于反光层22远离膜片主体21的 一侧，并覆盖反光层22。这样，通过吸光层122吸收了由光学膜片2的正面穿过膜片主体21和反光层22的光线，有效防止了用户由光学膜片2的前侧看到位于光学膜片2背侧的背板1，从而保证了观影质量。同时，由于吸光层23覆盖于反光层22上，因此吸光层23能够对反光层22起到保护作用，避免反光层22直接暴露于外界环境中，降低了反光层22在运输安装过程中被硬物刮伤的可能性。
在一些实施例中，为了使吸光层23具有较优的吸光性能，吸光层23应由黑色、深棕色等深色材料制作，且吸光层23可以为单面胶、油漆、PET(Polyethylene Terephthalate，聚对苯二甲酸乙二酯)膜片、丝印油墨等，在此不做具体限定。其中，由于黑色单面泡棉胶为机械领域内的常用材料，且遮光性能好，防刮性能较优，因此，在一些实施例中，参见图2，吸光层23为黑色单面泡棉胶，黑色单面泡棉胶通过其带胶面粘接于反光层22上，通过黑色单面泡棉胶的粘结力，可减小膜片主体21膨胀收缩时带来的尺寸变化。
在一些实施例中，为了将背板单元11连接于墙壁上，固定件可以为螺钉或卡扣等等，在此不做具体限定。但是，相比于采用卡扣将背板单元11连接于墙壁上的方案，采用螺钉将背板单元11连接于墙壁上时的稳定性更高，能够有效防止背板单元11由墙壁上脱落。因此，在一些实施例中，背板单元11通过螺钉连接于墙壁上，如图3所示，背板单元11上开设有过孔6，墙壁上与过孔6相对的位置开设有螺纹孔(图中未示出)，固定件为螺钉，螺钉穿过过孔6与螺纹孔配合连接，以将背板单元11连接于墙壁上，由此通过螺钉实现了背板单元11与墙壁的连接。
其中，背板单元11上设置的过孔6的数量可以为一个或多个，在此不做具体限定。为了提高背板单元11与墙壁之间的连接可靠性，在一些实施例中，如图3所示，背板单元11上设置有多个过孔6，通过多个螺钉分别穿过多个过孔6可将背板单元11固定于墙壁上，可靠性更高。
当背板单元11上设置有多个过孔6时，多个过孔6可以均匀开 设于背板单元11上，也可以一个开设于背板单元11的中心位置，另外多个过孔6开设于背板单元11的边沿位置，在此不做具体限定。但是，为了有效固定背板单元11，同时防止背板单元11的边沿翘起，在一些实施例中，如图3所示，过孔6包括开设于背板单元11中心位置的一个过孔6、以及均匀开设于背板单元11边沿位置的多个过孔6，由此通过螺钉穿过开设于背板单元11中心位置的一个过孔6，即可将背板单元11的中心位置固定于墙壁上，同时，通过多个螺钉分别穿过开设于背板单元11边沿位置的多个过孔6，即可将背板单元11的边沿位置固定于墙壁上，以实现了背板单元11的有效固定，同时防止了背板单元11的边沿翘起。
示例的，如图3所示，当背板单元11为方形时，过孔6可以包括开设于背板单元11中心位置的一个过孔6、以及开设于背板单元11边沿的四个拐角处的四个过孔6，由此可将背板单元11有效固定于墙壁上，同时防止背板单元11边沿的四个拐角翘起。
在图1所示的实施例中，光学膜片2靠近背板1的表面上固定的磁铁4数量可以为一个或多个，在此不做具体限定。但是，为了提高光学膜片2与背板1之间的连接可靠性，在一些实施例中，如图4所示，光学膜片2靠近背板1的表面上固定有多个磁铁4，通过多个磁铁4将光学膜片2固定于背板1上，可靠性更高。
当光学膜片2靠近背板1的表面上固定有多个磁铁4时，多个磁铁4可以均匀固定于光学膜片2靠近背板1的表面上，也可以一部分固定于光学膜片2靠近背板1的表面的中部区域内，另一部分固定于光学膜片2靠近背板1的表面的边沿位置，在此不做具体限定。为了将光学膜片2有效固定于背板1上，同时为了防止光学膜片2的边沿翘起，在一些实施例中，如图4所示，磁铁4包括设置于光学膜片2靠近背板1的表面的中部区域内的第一磁铁41、以及设置于光学膜片2靠近背板1的表面的边沿位置的第二磁铁42，由此通过第一磁铁41可将光学膜片2的中部区域固定于背板1上，同时，通过第二磁铁42可将光学膜膜片的边沿位置固定于背板1上， 以将光学膜片2有效固定于背板1上，同时防止了光学膜片2的边沿翘起。
其中，优选第二磁铁42为多个，多个第二磁铁42围绕光学膜片2靠近背板1的表面的边沿一周均匀设置，以防止光学膜片2的边沿一周翘起。
在图4所示的实施例中，为了有效防止光学膜片2的边沿翘起，同时为了减小磁铁4的贴设区域面积，在一些实施例中，光学膜片2靠近背板1的表面为参考面，第二磁铁42与参考面上靠近此第二磁铁42的边沿之间的距离L为5mm～10mm，第二磁铁42与参考面上靠近此第二磁铁42的边沿之间的距离在此范围内，即可有效防止光学膜片2的边沿翘起，同时减小了磁铁的贴设区域面积，从而能够减小所贴设磁铁4的数量。而当第二磁铁42与参考面上靠近此第二磁铁42的边沿之间的距离小于5mm时，第二磁铁42与参考面上靠近此第二磁铁42的边沿之间的距离较小，参考面上的磁铁4贴设区域较大，在达到相同磁铁4密度的前提下，所需设置的磁铁4数量较多，成本较高；而当第二磁铁42与参考面上靠近此第二磁铁42的边沿之间的距离大于10mm时，第二磁铁42与参考面上靠近此第二磁铁42的边沿之间的距离较大，光学膜片2的边沿无强度，且容易翘起。
为了提高屏幕的表面平整度，在一些实施例中，第一磁铁41为条形磁铁，第一磁铁41的长边沿光学膜片的宽度方向设置。这样，第一磁铁41能够在光学膜片2的宽度方向上对光学膜片2进行有效支撑，减小光学膜片2在外力作用下沿宽度方向产生皱缩的可能性，从而提高了屏幕表面的平整度。
其中，第一磁铁41可以为沿光学膜片2的宽度方向延伸的一个条形整体，也可以包括沿光学膜片2的宽度方向间隔设置的多个磁条段，在此不做具体限定。但是，为了降低第一磁铁41的成本，同时，为了使光学膜片2在受热或受冷时能够推动第一磁铁41沿光学膜片2的宽度方向在背板1上顺利滑移，在一些实施例中，第一磁 铁41包括多个磁条段411，多个磁条段411沿光学膜片2的宽度方向间隔设置。这样，可减少第一磁铁41的用料，从而减少第一磁铁41的用料成本，同时，单个磁条段411的长度较短，能够产生的磁吸附力较弱，使光学膜片2在受热或受冷时能够推动磁条段411沿光学膜片2的宽度方向在背板1上顺利滑移。其中，多个磁条段411可以沿光学膜片2的宽度方向均匀设置，也可以非均匀设置，在此不做具体限定。
在上述实施例中，为了将光学膜片2稳定吸附至背板1上，同时为了保证磁条段411能够在背板1上顺利滑移，在一些实施例中，如图4所示，每个磁条段411与背板1之间的吸附力为60～80N，当磁条段411与背板1之间的吸附力在此范围内时，既能够将光学膜片2稳定吸附至背板1上，又能够使磁条段411在光学幕片12的推力作用下在背板1上顺利滑移。
其中，为了使光学膜片2在受热或受冷时能够沿光学膜片2的宽度方向顺利滑移，同时为了在光学膜片2的宽度方向上对光学膜片2进行有效支撑，在一些实施例中，如图4所示，相邻两个磁条段411之间的间距为250～300mm，当相邻两个磁条段411之间的间距小于250mm时，沿光学膜片2的宽度方向设置的磁条段411的密度较大，光学膜片2在受热或受冷时不能沿光学膜片2的宽度方向顺利滑移；当相邻两个磁条段411之间的间距大于300mm时，沿光学膜片2的宽度方向设置的磁条段411的密度较小，不能在光学膜片2的宽度方向上对光学膜片2进行有效支撑。
另外，针对磁条段411的设置数量，可以根据激光投影屏幕的尺寸大小进行具体选择。
为了提高光学膜片2的中部区域与背板1之间的连接稳定性，在一些实施例中，第一磁铁41为多个，多个第一磁铁41沿光学膜片2的高度方向间隔设置，由此光学膜片2通过多个第一磁铁41与背板1吸合，从而提高了光学膜片2的中部区域与背板1之间的连接稳定性。
为了避免光学膜片2在外力作用下向下掉落，在一些实施例中，如图5所示，自所述背板1的下边沿折弯并向前延伸形成止挡部7，光学膜片2的底部位于止挡部7的上方。这样，止挡部7能够阻止光学膜片2在外力作用下向下掉落。
为了遮挡并装饰背板1和光学膜片2的边沿一周，如图2或图5所示，还包括包覆于背板1和光学膜片2的边沿一周的边框8，边框8包括第一侧壁81以及与第一侧壁垂直的第二侧壁82，第一侧壁81固定于光学膜片2远离背板1的表面的边沿，第二侧壁82遮挡于光学膜片2和背板1的侧壁上，由此通过边框8装饰并遮挡了背板1和光学膜片2的边沿一周，由于本发明实施例中光学膜片2已经通过磁铁4有效吸附在了背板1上，因此无需再通过边框8来固定光学膜片2与背板1之间的相对位置，因此边框8仅作为装饰和遮挡用，第一侧壁81的宽度可以做得很窄，以实现窄边框设计。
其中，第一侧壁81可以通过如图2或图5所示双面胶带9、固体胶、胶水等粘接于光学膜片2远离背板1的表面的边沿，也可以通过螺钉连接于光学膜片2远离背板1的表面的边沿，在此不做具体限定。
另外，边框8可以由塑料或者铝型材等材料制作，在此不做具体限定。
本发明实施例还提供了一种投影系统，包括投影机和激光投影屏幕，其中，所述激光投影屏幕为如上技术方案所述的激光投影屏幕。
由于在本实施例的投影系统中使用的激光投影屏幕与上述激光投影屏幕的各实施例中提供的激光投影屏幕相同，因此二者能够解决相同的技术问题，并达到相同的预期效果。
在本说明书的描述中，具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
以上，仅为本发明的具体实施方式，但本发明的保护范围并不 局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以权利要求的保护范围为准。

Claims (16)

  1. 一种激光投影屏幕，其特征在于，包括背板以及与所述背板层叠设置的光学膜片，所述背板由磁性材料制作，所述光学膜片靠近所述背板的表面上固定有磁铁，所述光学膜片通过所述磁铁吸附于所述背板上。
  2. 根据权利要求1所述的激光投影屏幕，其特征在于，所述背板由多个平板状的背板单元拼接而成，至少一个所述背板单元能够通过固定件与墙壁连接。
  3. 根据权利要求2所述的激光投影屏幕，其特征在于，每个所述背板单元均能够通过固定件与墙壁连接。
  4. 根据权利要求1所述的激光投影屏幕，其特征在于，所述背板靠近所述光学膜片的一侧设有支撑层，所述支撑层上对应所述磁铁的位置开设有避让孔，所述磁铁穿过所述避让孔后吸附在所述背板上。
  5. 根据权利要求4所述的激光投影屏幕，其特征在于，所述支撑层由弹性材料制作，且所述支撑层在自由状态时的厚度大于所述磁铁的厚度。
  6. 根据权利要求5所述的激光投影屏幕，其特征在于，所述支撑层在自由状态时的厚度与所述磁铁的厚度之差大于等于0.3mm，小于等于0.5mm。
  7. 根据权利要求1所述的激光投影屏幕，其特征在于，所述光学膜片包括膜片主体、反光层和吸光层，所述膜片主体由透光材料制作，所述反光层设置于所述膜片主体朝向所述背板的表面上，所述吸光层设置于所述反光层远离所述膜片主体的一侧，并覆盖所述反光层。
  8. 根据权利要求7所述的激光投影屏幕，其特征在于，所述吸光层为黑色单面泡棉胶，所述黑色单面泡棉胶通过其带胶面粘接于所述反光层上。
  9. 根据权利要求2所述的激光投影屏幕，其特征在于，至少一个所述背板单元上开设有过孔，所述固定件为螺钉，所述螺钉穿过所述过孔将所述背板单元连接于所述墙壁上。
  10. 根据权利要求1所述的激光投影屏幕，其特征在于，所述磁铁包括设置于所述光学膜片靠近所述背板的表面的中部区域内的第一磁铁、以 及设置于所述光学膜片靠近所述背板的表面的边沿位置的第二磁铁。
  11. 根据权利要求10所述的激光投影屏幕，其特征在于，所述光学膜片靠近所述背板的表面为参考面，所述第二磁铁与所述参考面上靠近所述第二磁铁的边沿之间的距离L为5mm～10mm。
  12. 根据权利要求10所述的激光投影屏幕，其特征在于，所述第一磁铁为条形磁铁，所述第一磁铁的长边沿所述光学膜片的宽度方向设置。
  13. 根据权利要求12所述的激光投影屏幕，其特征在于，所述第一磁铁包括多个磁条段，多个所述磁条段沿所述光学膜片的宽度方向间隔设置。
  14. 根据权利要求13所述的激光投影屏幕，其特征在于，每个所述磁条段与所述背板之间的吸附力为60～80牛。
  15. 根据权利要求1所述的激光投影屏幕，其特征在于，自所述背板的下边沿折弯并向前延伸形成止挡部，所述光学膜片的底部位于所述止挡部的上方。
  16. 一种投影系统，其特征在于，包括投影机和激光投影屏幕，其中，所述激光投影屏幕为权利要求1～15中任一项所述的激光投影屏幕。
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