WO2021249508A1

WO2021249508A1 - Projection system

Info

Publication number: WO2021249508A1
Application number: PCT/CN2021/099497
Authority: WO
Inventors: 张红秀; 唐泽达; 王霖
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-06-10
Filing date: 2021-06-10
Publication date: 2021-12-16
Also published as: CN213092095U

Abstract

A projection system comprises a projector (11), a projection screen (12), a first support assembly (13), a reflection device (15), and a position adjustment device (16). The projector (11) is used to emit a projection beam. The projection screen (12) is used to ultimately receive and display the projection beam emitted by the projector (11). The first support assembly (13) is used to support the projection screen (12). The reflection device (15) is provided on an optical path of an emission beam emitted by the projector (11) toward the projection screen (12). An included angle between the reflection device (15) and a horizontal direction is adjustable. The reflection device (15) is used to change a propagation direction of the emission beam, and reflects the projection beam to the projection screen (12). The position adjustment device (16) is used to adjust heights of the projector (11) and the reflection device (15) and included angles thereof with respect to the horizontal direction, so as to prevent the reflection device (15) from causing occlusion of image information displayed on the projection screen (12). The invention reduces the throw ratio, and improves the contrast of projection frames while preventing occlusion of projection frames.

Description

A projection system

Technical field

This application relates to the field of projection technology, in particular to a projection system.

Background technique

The projection ratio (the ratio of the projection distance to the projection screen width) of the existing front-mounted projector (the projector is set below the screen) is generally greater than 0.2. For a 100-inch screen, the projection distance is generally greater than 450mm; for formal education For the projector, if the projection distance is 450mm, the projection light will be blocked. Therefore, in order to prevent the light from being blocked, the education projector is generally set above the screen (that is, the flip-mounted education projector), and the projection light and ambient light come from In the same direction, because the ambient light mainly comes from the top of the screen, the anti-ambient light screen achieves selective light absorption by distinguishing the projection light and the ambient light from different directions, so as to achieve the purpose of anti-ambient light, so the flip-chip projector cannot absorb the top Ambient light may cause the screen to turn white and make the contrast poor.

Utility model content

The present application provides a projection system that can reduce the projection ratio and increase the contrast of the projection image without blocking the projection image.

In order to solve the above technical problems, the technical solution adopted in this application is to provide a projection system, which includes: a projector, a projection screen, a first supporting component, a first fixing component, a reflecting device, and a position adjusting device. The projection screen is placed in the vertical direction to finally receive and display the projection beam emitted by the projector; the first support assembly is used to carry the projection screen; the reflective device is arranged on the projection screen where the projection beam emerges from the projector In the light path, and the angle between the reflective device and the horizontal direction is adjustable, the reflective device is used to change the propagation direction of the outgoing beam to reflect the projection beam onto the projection screen; the position adjustment device is fixedly connected to the first support assembly, and The position adjusting device carries the projector and the reflecting device, and is used to adjust the height of the projector and the reflecting device and the angle between the two and the horizontal direction to avoid the image information displayed on the projection screen from being blocked by the reflecting device.

In one embodiment, the projection system further includes: a first fixing assembly and a base, the first fixing assembly is arranged between the projection screen and the first support assembly, and is used for fixing the projection screen to the first support assembly; the base is used for fixing The first support assembly.

In one embodiment, the position adjusting device includes a placing component, a second fixing component, and a second supporting component. The placing component is used to carry the projector and the reflecting device, and the second fixing component is used to fix the placing component on the first supporting component. , The second supporting component is fixed on the first supporting component and the placing component for supporting the placing component.

In one embodiment, the placing component includes a first placing piece and a second placing piece. The first placing piece is used to place the projector and the reflecting device; the second placing piece is connected to the first placing piece and is used to limit the projector and the reflection. The location of the device.

In one embodiment, the second support assembly includes a first support, a second support, and a third support. The first support is fixed on the placement assembly, and the second support is connected to the first support and the placement assembly, respectively. , The third support is connected with the placing assembly.

In one embodiment, the second fixing component includes a first fixing piece and a second fixing piece. The first fixing piece is used to fix one end of the placing assembly on the first support assembly, and the second fixing piece is used to connect the projector to the When the reflecting device is inclined, the other end of the placing assembly is fixed on the first support assembly through the second support assembly.

In one embodiment, the first fixing component is adhesive glue or double-sided tape, the angle between the bottom edge of the projector and the horizontal direction is a first preset angle, and the angle between the side edge of the reflector and the horizontal direction is a second preset angle. Set the angle.

In one embodiment, the first preset angle is 180°, the second preset angle is 90°, the reflective device is rectangular, and the aspect ratio of the reflective device is equal to that of the projection screen.

In one embodiment, the first preset angle is 120°-160°, the second preset angle is 60°-80°, and the reflective device is a trapezoidal mirror.

In one embodiment, the projector includes a lens, and the horizontal distance between the lens and the projection screen is less than a preset horizontal distance.

Through the above solution, the beneficial effect of the present application is that the first support assembly in the projection system can support the projection screen and the position adjustment device, the projection screen can be fixed on the first support assembly through the first fixing assembly, and the position adjustment device Fixed on the first support assembly, used to adjust the height of the projector and the reflecting device and the angle between the two and the horizontal direction. The projection beam emitted by the projector can be projected on the reflecting device and generate on the reflecting device. Reflect, and thus reflect to the projection screen; because of the setting of the reflective device, the distance between the projector and the projection screen can be reduced, that is, the projection distance is reduced, so that the projection ratio is reduced, and the light will not be blocked. Set under the projection screen, the projection screen can be set as an anti-ambient light screen to absorb top ambient light, which can increase the contrast of the projection screen without blocking the projection screen, and will not cause the screen to turn white.

Description of the drawings

In order to explain the technical solutions in the embodiments of the present application more clearly, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. in:

Fig. 1 is a schematic structural diagram of an embodiment of a projection system provided by the present application;

FIG. 2 is a schematic diagram of the light path projected in the embodiment shown in FIG. 1;

Fig. 3 is a schematic diagram of the first support assembly in the embodiment shown in Fig. 1.

4 is a schematic structural diagram of another embodiment of the projection system provided by the present application;

FIG. 5 is a schematic diagram of the placement angle and position of the reflecting device and the projector in FIG. 4;

FIG. 6 is a schematic diagram of the size of the reflective device in the embodiment shown in FIG. 4;

FIG. 7 is a schematic diagram of the projection distance in the embodiment shown in FIG. 4.

detailed description

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of this application.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of an embodiment of a projection system provided by the present application. The projection system includes: a projector 11, a projection screen 12, a first supporting assembly 13, a first fixing assembly 14, a reflecting device 15 and a position调装置16。 Adjusting device 16.

The projector 11 is used to project a projection beam, and the angle between the projector 11 and the horizontal direction is the first preset angle, and it is arranged below the side of the projection screen 12 that receives the projection beam, that is, the projection system in this embodiment is a front-mounted projection In the system, the projector 11 can be a short throw projector; it is understandable that the projector 11 in this embodiment can be a front projection projector or a rear projection projector; preferably, the projector 11 is a rear projection projector , The distance from the light emitted by the projector 11 to the subsequent optical system can be further reduced, the volume of the projection system is effectively reduced, the size of the overall device is reduced, and the light is not blocked.

The projection screen 12 is placed along a direction perpendicular to the horizontal direction to finally receive and display the projection beam emitted by the projector 11. It can display the image information contained in the projection beam. Soft screens, magnetic screens, PET (Polyethylene terephthalate , Polyethylene terephthalate) screens and other high-contrast, high-gain screens or screen structures to further achieve the purpose of anti-ambient light.

The first supporting component 13 may be a wall mount, a screen bracket, a wall or a glass plate, etc., for example, the first supporting component 13 is a wall, and the screen or curtain can be hung on the wall.

The first fixing assembly 14 is arranged between the projection screen 12 and the first support assembly 13, for fixing the projection screen 12 to the first support assembly 13, that is, one end of the first fixing assembly 14 is connected to the projection screen 12, and the first fixing assembly 14 is connected to the projection screen 12 at the same time. The other end of a fixing component 14 is connected to the first supporting component 13, so that the projection screen 12 is connected to the first supporting component 13 to achieve the purpose of fixing; specifically, the first fixing component 14 may have a mechanical structure or have an adhesive effect For example, the projection screen 12 is a soft screen, the first fixing component 14 is adhesive or double-sided tape, the projection screen 12 is a magnetic screen or curtain structure, and the first fixing component 14 is a magnetic adsorption element. The magnetic projection screen 12 is adsorbed on the first support assembly 13.

The reflecting device 15 is arranged in the light path of the projecting light beam from the projector 11 to the projection screen 12, and the angle between the reflecting device 15 and the horizontal direction is adjustable. It is used to change the propagation direction of the projecting light beam from the projector 11 to Reflect the projection light beam onto the projection screen 12 to realize the refraction of the light path, thereby reducing the transmission distance of the light beam and reducing the overall volume of the projection system. In this embodiment, the angle between the reflection device 15 and the horizontal direction is the second preset angle , It can reflect the projection light beam emitted by the projector 11 to the projection screen 12. As shown in Figure 2, the reflecting device 15 can be a plane mirror. It is understandable that the reflecting device 15 can also be other devices with reflection function. , Such as a free-form surface mirror or a reflective bowl, as long as it can refract and reflect the projection beam to the projection screen 12, and the optical damage and optical distortion are small.

The position adjustment device 16 is fixedly connected to the first support assembly 13, and the position adjustment device 16 carries the projector 11 and the reflecting device 15, which is used to adjust the height of the projector 11 and the reflecting device 15 and the height between the two and the horizontal direction. The included angle is to prevent the image information displayed on the projection screen 12 from being blocked by the reflective device 15; specifically, the position adjusting device 16 can adjust the height of the projector 11 and the angle between the bottom surface of the projector 11 and the horizontal direction, so that the projector 11 The direction of the outgoing projection beam can be changed to meet the requirements for different positions of the projector 11 under different usage environments. Similarly, the position adjustment device 16 can also change the angle between the reflecting device 15 and the horizontal direction, so that the reflecting device 15 can be Reflect the projection beam to the projection screen 12 at different angles, shorten the projection distance from the projector 11 to the projection screen 12, and reduce the projection ratio when the width of the projection screen 12 remains unchanged; it is understandable that the position adjustment device 16 can be used at the same time Adjust the height and angular position of the projector 11 and the reflective device 15 so that the projector 11 and the reflective device 15 can be deflected relative to the projection screen 12, and prevent the reflective device 15 from blocking part of the image information displayed on the projection screen 12, and cannot make the image information Passed to the audience’s eyes, the audience’s viewing experience is improved. Furthermore, by setting the position adjustment device 16, the relative positions of the projector 11, the reflecting device 15 and the projection screen 12 can be adjusted so as to adapt to different assembly conditions. Therefore, the formal ultra-short throw projection solution provided in this embodiment can be applied to more application scenarios.

This embodiment provides a front-mounted ultra-short-throw projection solution, which can be applied to an educational ultra-short-throw projection system. Because the reflective device 15 is used to reflect the projection beam emitted by the projector 11, the distance between the projector 11 and the projection screen 12 The distance of the projector is reduced, that is, the projection distance is reduced. When the width of the projection screen 12 remains unchanged, the projection ratio can be reduced without blocking the light; in addition, because the projector 11 is arranged on the projection screen 12 to receive the projection beam Under one side, an anti-ambient light screen can be used to improve the ability of the projection system to resist ambient light at the top, which can increase the contrast of the projection image without blocking the projection image.

Continuing to refer to Figure 1, the projection system also includes: a base 17, the base 17 can be placed on a horizontal surface, the first support assembly 13 is fixed on the base 17, the first support assembly 13 can be a wall mount, as shown in Figure 3, the wall mount It is fixed on the base 17 and the projection screen 12 is fixed on the wall mount.

As shown in FIG. 4, the position adjusting device 16 includes a placing component 161, a second fixing component 162, and a second supporting component 163. The placing component 161 is used to carry the projector 11 and the reflecting device 15. The reflecting device 15 is arranged in the placing assembly 161 to prevent the projector 11 and the reflecting device 15 from sliding out when tilted; the second fixing assembly 162 is used to fix the placing assembly 161 on the first supporting assembly 13 and changing the placing assembly 161 The angular relationship with the first support assembly 13; the second support assembly 163 is used to support the placement assembly 161, so as to make the structure of the projection system more stable.

Specifically, the placement assembly 161, the second fixing assembly 162, and the second support assembly 163 can be connected by bolts and nuts. The placement assembly 161 is fixed on the first support assembly 13 through the second fixing assembly 162, and the placement assembly 161 is connected to the first support assembly 13 A bolt may be provided on one side of the second fixing component 162, and the second fixing component 162 may be a nut. The bolt cooperates with the nut to perform a fixing function; in the same way, the second supporting component 163 and the first supporting component 13 Or the placement component 161 can also be connected by a bolt and a nut.

Further, the placing assembly 161 includes a first placing piece 1611 and a second placing piece 1612. The first placing piece 1611 is used for placing the projector 11 and the reflecting device 15; the second placing piece 1612 is connected to the first placing piece 1611 and is used To limit the positions of the projector 11 and the reflective device 15 to prevent the projector 11 and the reflective device 15 from slipping out of the placement assembly 161.

The second fixing component 162 includes a first fixing piece 1621 and a second fixing piece 1622, wherein the first fixing piece 1621 is used to fix one end of the placing assembly 161 on the first supporting assembly 13, specifically, the first fixing piece 1621 Fix one end of the first placing member 1611 on the first supporting assembly 13, and the other end of the first placing member 1611 is connected to the second placing member 1612; the second fixing member 1622 is used when the projector 11 and the reflecting device 15 are tilted , The other end of the placing component 161 is fixed on the first supporting component 13 through the second supporting component 163, the position of the other end of the placing component 161 can be adjusted within a preset range, and the preset range can be an adjustment set based on experience The range is sufficient to ensure that the reflective device 15 can reflect the projection beam to the projection screen 12.

The second support assembly 163 includes a first support 1631, a second support 1632, and a third support 1633. The first support 1631 is fixed on the placement assembly 161. The first support 1631 can provide a supporting force to the reflective device 15. The second supporting member 1632 is respectively connected to the first supporting member 1631 and the placing assembly 161, and one end of the third supporting member 1633 is connected to the placing assembly 161; specifically, the first supporting member 1631 is fixedly connected to the first placing member 1611, Both ends of the two support members 1632 are respectively connected to the first support assembly 1631 and the first placement member 1611, and one end of the third support member 1633 is connected to the first placement member 1611. Optionally, as shown in FIG. 4, the third support member The other end of the 1633 can also be connected to the second fixing member 1622 and fixed to the first support assembly 13.

In a specific embodiment, as shown in FIG. 1, the angle between the bottom edge of the projector 11 and the horizontal direction (that is, the first preset angle, denoted as α) is 180°, and the side edge of the reflecting device 15 is opposite to the horizontal direction. The included angle (that is, the second preset angle) is 90°, that is, the reflecting device 15 is parallel to the projection screen 12. At this time, as long as the first fixing member 1621 can fix the first placement member 1611, the third support member 1633 may not be connected to the first positioning member 1611. A fixing assembly 14 is connected. Preferably, in order to ensure the stability of the overall structure, the third support 1633 can be fixed on the first support assembly 13 during use.

The reflective device 15 may be rectangular, and the aspect ratio of the reflective device 15 is equal to that of the projection screen 12, for example, the aspect ratio of both is 16:9; the horizontal distance between the reflective device 15 and the projection screen 12 The height of the reflective device 15 is 550-660mm, and the height difference between the lower side of the reflective device 15 and the lower side of the projection screen 12 is 80-120mm. For example, the bottom edge of the reflective device 15 is on the bottom of the projection screen 12. 80-120mm below the edge.

In another specific embodiment, in order to prevent the reflective device 15 from blocking the projection screen generated by the projector 11, the reflective device 15 can be placed at a certain angle with the projection screen 12, that is, the reflective device 15 can be placed obliquely with respect to the projection screen 12, or it can be Adjustment In this embodiment, as shown in Figures 4 and 5, a viewing distance of 3m is taken as an example for description. In order not to block the viewer’s line of sight, the reflective device 15 is a trapezoidal mirror, and the upper side of the reflective device 15 is connected to the projection screen 12. The height difference H'of the lower side of the lower side is 65-80mm, preferably, H'is 70-75mm; the horizontal distance L'between the reflective device 15 and the projection screen 12 is 300-390mm, preferably, L'is 345- 365mm.

The angle α between the projector 11 and the horizontal direction is 120°-160°, that is, the first preset angle is 120°-160°, preferably, the first preset angle is 130°-150°; the side of the reflecting device 15 The angle β with the horizontal direction is 60°-80°, that is, the second preset angle is 60°-80°. Since the projector 11 and the reflecting device 15 are placed obliquely, the distance between the projector 11 and the projection screen 12 is reduced. It is small, so that the projection distance is reduced, thereby reducing the projection ratio, and the reflective device 15 will not block the projection screen 12, and the audience can see the complete picture.

Further, the projector 11 includes a lens (not shown in the figure), and the horizontal distance between the lens and the projection screen 12 is less than a preset horizontal distance, and the preset horizontal distance may be a distance value that is infinitely close to 0 mm, such as 0.5 mm. ; The height difference between the lens and the projection screen 12 is 170-210mm, preferably, the height difference between the lens and the projection screen 12 is 180-200mm.

When the reflective device 15 is placed obliquely, as shown in FIG. 6, J is the position of the lens, the reflective device DEFG is parallel to the projection screen 12, the aspect ratio of the reflective device DEFG is the same as that of the projection screen 12, and the reflective device DEFG It is rectangular, and the distance between the reflecting device DEFG and the lens is JH. If the reflecting device 15 is moved away from the lens, the size of the reflecting device DEFG will increase and become the reflecting device D'E'F'G', which will reflect The device DEFG is rotated by an angle δ along the bottom side DG away from the projection screen 12, and the reflecting device DE'F'G can be obtained. The reflecting device D'E'F'G' and the reflecting device DEFG satisfy the following relationship:

Among them, H, H', I and I'are the midpoints of GD, G'D', EF and E'F', and the high HI' of the reflecting device DE'F'G can be calculated by the law of cosines, as shown below :

HI' ² ＝HH' ² +H'I' ² -2*HH'*H'I'*cos(γ)

Among them, γ is the angle between H'I' and HH'.

Therefore, under the condition that the position of the bottom edge of the reflector 15 and the angle δ between the reflector 15 and the projection screen 12 and the distance HH' are known, the length of the top side and the bottom of the trapezoidal reflector 15 when placed obliquely can be calculated accordingly. The length and height of the side, thereby realizing the beneficial effects of the projection system provided by the present application.

In order to further illustrate the advantages of the present application, please continue to refer to FIG. 5 and FIG. 7 together. In FIG. 5, A is the position of the projector 11 in this embodiment, and the projector 11 can emit projection beams B1-B2. B1 is reflected by the reflection device 15 to form a projection beam B3, and the projection beam B2 is reflected by the reflection device 15 to form a projection beam B4; A'is the position of the projector in the prior art, which can emit projection beams B1'-B2'; L is the projection distance of this embodiment, and L'is the projection distance of the projector in the prior art. That is to say, the position of the projector 11 in this embodiment is compared with the position of the projector in the prior art. The distance is shortened from L'to L, which greatly reduces the projection distance.

This embodiment provides a projection system. The projection beam generated by the projector 11 can be projected onto the reflective device 15, and specular reflection occurs on the reflective device 15, and reflected on the projection screen 12 to achieve projection display, and the projection distance It is shortened and will not cause light blocking. At the same time, due to the front-mounted projection solution, it can be matched with an anti-ambient light screen, thereby significantly improving the contrast of the projection display.

The above are only examples of this application, and do not limit the scope of this application. Any equivalent structure or equivalent process transformation made by using the content of the description and drawings of this application, or directly or indirectly applied to other related technical fields, The same reasoning is included in the scope of patent protection of this application.

Claims

A projection system is characterized in that it comprises:

Projector, used to project the projection beam;

A projection screen, the projection screen is placed in a vertical direction, and is used to finally receive and display the projection beam emitted by the projector;

The first supporting component is used to carry the projection screen;

A reflecting device, the reflecting device is arranged in the light path where the beam of the projector exits to the projection screen, and the angle between the reflecting device and the horizontal direction is adjustable, and the reflecting device is used to change the light path The propagation direction of the outgoing beam to reflect the projection beam onto the projection screen;

A position adjustment device, the position adjustment device is fixedly connected to the first support assembly, and the position adjustment device carries the projector and the reflection device, and is used to adjust the height of the projector and the reflection device And the angle between the two and the horizontal direction to prevent the image information displayed on the projection screen from being blocked by the reflecting device.
The projection system according to claim 1, wherein the projection system further comprises:

A first fixing assembly, the first fixing assembly is arranged between the projection screen and the first support assembly, and is used to fix the projection screen to the first support assembly;

The base is used to fix the first supporting component.
The projection system according to claim 2, wherein:

The position adjusting device includes a placing component, a second fixing component, and a second supporting component, the placing component is used to carry the projector and the reflecting device, and the second fixing component is used to fix the placing component On the first supporting component, the second supporting component is fixed on the first supporting component and the placing component for supporting the placing component.
The projection system according to claim 3, wherein:

The placing assembly includes a first placing piece and a second placing piece, the first placing piece is used to place the projector and the reflecting device; the second placing piece is connected to the first placing piece, To limit the positions of the projector and the reflecting device.
The projection system according to claim 3, wherein:

The second support assembly includes a first support, a second support, and a third support. The first support is fixed on the placement assembly, and the second support is connected to the first support. And the placement component is connected, and the third support is connected to the placement component.
The projection system according to claim 3, wherein:

The second fixing component includes a first fixing piece and a second fixing piece. The first fixing piece is used for fixing one end of the placing assembly on the first supporting assembly, and the second fixing piece is used for When the projector and the reflecting device are tilted, the other end of the placement assembly is fixed on the first support assembly through the second support assembly.
The projection system according to claim 2, wherein:

The first fixing component is adhesive glue or double-sided tape, the angle between the bottom edge of the projector and the horizontal direction is a first preset angle, and the angle between the side edge of the reflector and the horizontal direction is a second preset angle. Set the angle.
The projection system according to claim 7, wherein:

The first preset angle is 180°, the second preset angle is 90°, the reflective device is rectangular, and the aspect ratio of the reflective device is equal to that of the projection screen.
The projection system according to claim 7, wherein:

The first preset angle is 120°-160°, the second preset angle is 60°-80°, and the reflective device is a trapezoidal mirror.
The projection system according to claim 9, wherein:

The projector includes a lens, and the horizontal distance between the lens and the projection screen is less than a preset horizontal distance.