Shading piece and projection device

Abstract

The utility model discloses a shading piece and a projection device. The shading piece comprises a first light-transmitting part and a shading part located on the periphery of the first light-transmitting part. Wherein the shading part is used for shading light rays on the periphery of the first light transmitting part when the first light transmitting part is located on a projection light path of the projection device, so that the part of the light rays is diffracted. According to the technical scheme of the utility model, the shading piece comprises the first light-transmitting part and the shading part located at the periphery of the first light-transmitting part, so that when the first light-transmitting part is located at the projection light path of the projection device, the shading part shields light rays at the periphery of the first light-transmitting part, and the light rays at the periphery of the first light-transmitting part are shaded; the residual light of the projection device normally passes through the first light-transmitting part to form a projection picture, and the light shielded by the first light-shielding part diffracts and crosses the first light-transmitting part, so that the projection picture has a blurred edge, is soft in transition and does not form an obvious boundary.

Description

Technical Field

[0001] The utility model relates to the technical field of projection equipment, in particular to a shading element and a projection device. Background Art

[0002] The images projected by current projection products on the market are limited by physical properties. When projecting a black image, it is impossible to achieve a truly completely black dark field. Even if a completely black image is projected, the area covered by the projected image will always be covered with a layer of virtual shadows with obvious outer frames. The higher the projection brightness, the more obvious the dark field virtual shadow problem is. The larger the side projection angle, the more obvious the dark field virtual shadow of the image after trapezoidal correction, which affects the immersion of the image and the viewing experience. Utility Model Content

[0003] The main purpose of the utility model is to provide a shading member and a projection device, aiming to provide a shading member which can solve the problem that the dark edges of the images projected by the projection product cannot be removed and the images cannot be integrated with the environmental background.

[0004] In order to achieve the above-mentioned object, the utility model provides a light shielding member, wherein the light shielding member comprises a first light-transmitting portion and a light-shielding portion located outside the first light-transmitting portion;

[0005] The light shielding portion is used to shield the light outside the first light transmitting portion when the first light transmitting portion is in the projection light path of the projection device, so as to diffract the light.

[0006] Optionally, the shading member further comprises a second light-transmitting portion, and a mounting portion disposed at the periphery of the second light-transmitting portion and the shading portion, and the mounting portion is arranged in a ring shape;

[0007] Wherein, the mounting portion is used to be rotatably mounted in front of the projection lens of the projection device, so that the shading member can be rotated in front of the projection lens until the first light-transmitting portion is opposite to the effective area on the projection lens, or the light-shielding portion is misaligned with the effective area, and the second light-transmitting portion is used to cover the effective area when the light-shielding portion is misaligned with the effective area.

[0008] Optionally, there is a hollow area between the light-shielding portion and the mounting portion, and the hollow area forms the second light-transmitting portion.

[0009] The utility model also provides a projection device, the projection device includes an optical unit and a light shielding member, the light shielding member is arranged in front of a projection lens of the optical unit, the light shielding member includes a first light-transmitting portion and a light shielding portion located outside the first light-transmitting portion, the first light-transmitting portion is located in the projection light path;

[0010] The light shielding portion is used to shield the light outside the first light-transmitting portion so as to diffract the light.

[0011] The shading member is movably arranged relative to the optical unit so that the shading portion has an avoidance position that is movable outside the projection light path to avoid the projection light path, and a shading position that is at least partially located in the projection light path to block the light outside the first light-transmitting portion that is located in the projection light path.

[0012] Optionally, the shading member is rotatably arranged relative to the optical unit, so that the shading portion can rotate between the avoidance position and the shading position.

[0013] Optionally, the projection device further comprises a housing, the housing has a receiving cavity, the optical unit is installed in the receiving cavity, and the housing is provided with a through hole opposite to the projection lens of the optical unit;

[0014] The shading member further comprises a second light-transmitting portion, and a mounting portion arranged at the periphery of the second light-transmitting portion and the light-shielding portion. The mounting portion is arranged in a ring shape and is rotatably mounted on the through hole.

[0015] Optionally, the projection device further comprises a positioning structure, and the positioning structure is used to position the shading member and the optical unit when the shading portion is in the shading position.

[0016] Optionally, the shading member is detachably disposed on the projection lens; or,

[0017] The projection device further comprises a housing, wherein the housing has a receiving cavity, the optical unit is installed in the receiving cavity, and the shading member is detachably arranged on the outer side of the housing.

[0018] Optionally, the shape of the first light-transmitting portion matches the shape of a projection screen of the optical unit.

[0019] In the technical solution of the utility model, the shading member includes a first light-transmitting portion and a light-shielding portion located outside the first light-transmitting portion. In this way, when the first light-transmitting portion is in the projection light path of the projection device, the light-shielding portion blocks the light outside the first light-transmitting portion, and the remaining light of the projection device passes through the first light-transmitting portion normally to form a projection picture, while the light blocked by the first light-shielding portion is diffracted and passes through the first light-transmitting portion, so that the projection picture has a blurred edge and a soft transition without forming an obvious boundary. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of the projection device provided by the utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of the middle shading member;

[0023] Figure 3 for Figure 1 Schematic diagram of the principle of the central light unit and the light shielding element;

[0024] Figure 4 for Figure 1 A schematic diagram of a three-dimensional structure in which a light shielding member in a projection device is in an avoidance position;

[0025] Figure 5 for Figure 1 Schematic diagram of the structure of the Zhongguang unit.

[0026] Description of Figure Numbers:

[0027] Label name Label name 100 Projection device 2 Optical unit 1 Shading parts 21 Projection lens 11 The first light-transmitting part 210 Valid area 12 shading part 3 shell 13 The second light-transmitting part 200 Blurred Edges 14 Installation Department

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0032] The images projected by current projection products on the market are limited by physical properties. When projecting a black image, it is impossible to achieve a truly completely black dark field. Even if a completely black image is projected, the area covered by the projected image will always be covered with a layer of virtual shadows with obvious outer frames. The higher the projection brightness, the more obvious the dark field virtual shadow problem is. The larger the side projection angle, the more obvious the dark field virtual shadow of the image after trapezoidal correction, which affects the immersion of the image and the viewing experience.

[0033] In order to solve the above problems, the utility model proposes a shading member and a projection device, aiming to provide a shading member and a projection device, aiming to provide a shading member that can solve the problem that the picture projected by the projection product cannot remove the dark edges and the picture cannot be integrated with the environmental background. Figures 1 to 5 The present invention is a schematic structural diagram of an embodiment provided by the present invention.

[0034] Please refer to Figures 1 to 3 The utility model proposes a shading member 1, which includes a first light-transmitting portion 11 and a shading portion 12 located outside the first light-transmitting portion 11; wherein the shading portion 12 is used to block the light outside the first light-transmitting portion 11 when the first light-transmitting portion 11 is in the projection light path of the projection device 100, so that this part of the light is diffracted.

[0035] In the technical solution of the utility model, the shading member 1 includes a first light-transmitting portion 11 and a light-shielding portion 12 located outside the first light-transmitting portion 11, so that when the first light-transmitting portion 11 is in the projection light path of the projection device 100, the light-shielding portion 12 blocks the light outside the first light-transmitting portion 11, and the remaining light of the projection device 100 passes through the first light-transmitting portion 11 normally to form a projection picture, while the light blocked by the first light-shielding portion 12 is diffracted and passes through the first light-transmitting portion 11, so that the projection picture has a virtual edge 200 with a soft transition and no obvious boundary is formed.

[0036] The shading element 1 is a shading plate made of a shading material, the shading portion 12 is the main body of the shading plate, and the first light-transmitting portion 11 is a through hole opened on the shading portion 12 .

[0037] It is understandable that the blurred edge 200 of the projection image is required, sometimes it is required, sometimes it is not required, so in this embodiment, reference is made to Figure 1 , Figure 2 , Figure 4 and Figure 5 , the shading member 1 further includes a second light-transmitting portion 13, and a mounting portion 14 disposed on the periphery of the second light-transmitting portion 13 and the shading portion 12, and the mounting portion 14 is arranged in a ring shape. With such an arrangement, after the shading member 1 is mounted in front of the projection lens 21 of the projection device 100 through the mounting portion 14, the mounting portion 14 arranged in a ring shape can facilitate the rotation of the shading member 1 as a whole. When the shading member 1 is rotated, the shading portion 12 can be rotated to avoid the projection light path so that the projection device 100 is in a normal projection state, and the first light-transmitting portion 11 can also be rotated into the projection light path to form a virtual edge 200 on the projection screen. The user can choose according to his or her needs; The projection light path does not completely cover the entire projection lens 21. There is an effective area 210 on the projection lens 21, that is, the area where the projection light passes through the projection lens 21. In this way, the shading member 1 can rotate with the mounting portion 14 as the axis. While the rotation is convenient, the overall movable stroke of the shading member 1 is small. When the shading portion 12 is rotated to be misaligned with the effective area 210, the projection light path can be avoided. At this time, the second light-transmitting portion 13 covers the effective area 210 to allow light to pass normally.

[0038] There are many ways to form the second light-transmitting portion 13. In the present embodiment, there is a hollow area between the light-shielding portion 12 and the mounting portion 14, and the hollow area forms the second light-transmitting portion 13, so that the second light-transmitting portion 13 and the light-shielding portion 12 are arranged in parallel; in another embodiment, the second light-transmitting portion 13 can also be a hole opened on the light-shielding portion 12.

[0039] The utility model also proposes a projection device 100, which includes an optical unit 2 and a shading member 1, wherein the shading member 1 is arranged in front of a projection lens 21 of the optical unit 2, and the first light-transmitting portion 11 is located in the projection light path. The shading member 1 includes a first light-transmitting portion 11 and a shading portion 12 located outside the first light-transmitting portion 11; wherein the shading portion 12 is used to block light outside the first light-transmitting portion 11 so that this part of the light is diffracted.

[0040] In the technical solution of the utility model, the shading member 1 includes a first light-transmitting portion 11 and a light-shielding portion 12 located outside the first light-transmitting portion 11. The first light-transmitting portion 11 is located in the projection light path emitted by the optical unit 2. The light-shielding portion 12 blocks the light outside the first light-transmitting portion 11. The remaining light passes through the first light-transmitting portion 11 normally to form a projection picture, while the light blocked by the first light-shielding portion 12 is diffracted and passes through the first light-transmitting portion 11, so that the projection picture has a virtual edge 200 with a soft transition without forming an obvious boundary.

[0041] It should be noted that, although the projection screen of the projection device 100 is mostly rectangular, there are also projection screens of circular or other shapes. In order to reduce interference with the projection screen itself, the shape of the first light-transmitting portion 11 is adapted to the shape of the projection screen of the optical unit 2, that is, when the projection screen of the projection device 100 is rectangular, the shape of the first light-transmitting portion 11 is set to be rectangular, and when the projection screen is circular, the shape of the first light-transmitting portion 11 is set to be circular, to ensure that the shading portion 12 only blocks the projection light at the edge of the projection light path.

[0042] It is understandable that the blurred edge 200 of the projection screen is a demand, sometimes it is needed, sometimes it is not. In order to facilitate the user to freely choose according to the needs, in the present embodiment, the shading member 1 is movably arranged relative to the optical unit 2, so that the shading portion 12 has a avoidance position that can be moved outside the projection light path to avoid the projection light path, and a shading position that is at least partially located in the projection light path to block the light outside the first light-transmitting portion 11 located in the projection light path; in this way, the user can freely operate the movement of the shading member 1 to change the position of the shading portion 12 according to whether the blurred edge 200 is needed.

[0043] The shading member 1 can be moved in a variety of ways, and can be moved in front of the projection lens 21 by rotating, flipping, folding, telescoping, lifting, sliding, etc. In the present embodiment, the shading member 1 is rotatable relative to the optical unit 2 so that the shading portion 12 can rotate between the avoidance position and the shading position.

[0044] There are also many ways to rotate. Specifically, in this embodiment, refer to Figure 1 and Figure 4The projection device 100 further includes a housing 3, the housing 3 has a housing cavity, the optical unit 2 is installed in the housing cavity, and the housing 3 is provided with a through hole opposite to the projection lens 21 of the optical unit 2; the light shielding member 1 further includes a second light-transmitting portion 13, and a mounting portion 14 provided on the periphery of the second light-transmitting portion 13 and the light shielding portion 12, the mounting portion 14 is arranged in a ring shape and is rotatably mounted in the through hole. In this way, the light shielding member 1 can rotate relative to the projection lens 21, and the rotation stroke is small. Whether the virtual edge 200 is needed or not, it will not be needed, and the light shielding member 1 can be installed in the through hole, and the appearance of the projection device 100 is slightly changed. In another embodiment, the shading member 1 rotates around a rotating shaft arranged on the periphery of the projection lens 21, that is, when the shading portion 12 is in the shading position, the shading member 1 is completely located in front of the projection lens 21, and when the shading portion 12 is in the avoidance position, the shading member 1 is completely offset from the projection lens 21. In this way, the overall rotation stroke is larger.

[0045] In order to make the shading portion 12 stable when in the shading position and to facilitate and quickly move to the shading position, in the embodiment of the utility model, the projection device 100 further includes a positioning structure, and the positioning structure is used to position the shading member 1 and the optical unit 2 when the shading portion 12 is in the shading position. The embodiment of the utility model does not limit the specific structure of the positioning structure, and a magnetic positioning method or a protrusion and groove positioning method can be used.

[0046] Of course, in order to achieve a blurred edge of the projection image, the shading member 1 is not limited to being movable, and the shading member 1 can also be disassembled. In an embodiment of the utility model, the shading member 1 is detachably arranged on the projection lens 21; or, the projection device 100 also includes a housing 3, the housing 3 has a accommodating cavity, the optical unit 2 is installed in the accommodating cavity, and the shading member 1 is detachably arranged on the outside of the housing 3.

[0047] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A shading member, characterized in that: The light shielding member includes a first light-transmitting portion and a light-shielding portion located outside the first light-transmitting portion; The light shielding portion is used to shield the light outside the first light transmitting portion when the first light transmitting portion is in the projection light path of the projection device, so as to diffract the light.

2. The shading element according to claim 1, wherein: The light shielding member further comprises a second light-transmitting portion, and a mounting portion disposed at the periphery of the second light-transmitting portion and the light-shielding portion, wherein the mounting portion is arranged in a ring shape; Wherein, the mounting portion is used to be rotatably mounted in front of the projection lens of the projection device, so that the shading member can be rotated in front of the projection lens until the first light-transmitting portion is opposite to the effective area on the projection lens, or the light-shielding portion is misaligned with the effective area, and the second light-transmitting portion is used to cover the effective area when the light-shielding portion is misaligned with the effective area.

3. The shading element according to claim 2, wherein: A hollow area is provided between the light shielding portion and the mounting portion, and the hollow area forms the second light transmitting portion.

4. A projection device, characterized in that: include: Optical machine group; as well as, A shading member, as claimed in any one of claims 1 to 3, arranged in front of the projection lens of the optical unit; Wherein, the first light-transmitting portion is arranged in the projection light path of the optical unit.

5. The projection device according to claim 4, characterized in that: The shading member is movably arranged relative to the optical unit so that the shading portion has an avoidance position that is movable outside the projection light path to avoid the projection light path, and a shading position that is at least partially located in the projection light path to block the light outside the first light-transmitting portion that is located in the projection light path.

6. The projection device according to claim 5, characterized in that: The shading member is rotatably arranged relative to the optical unit, so that the shading portion can rotate between the avoidance position and the shading position.

7. The projection device according to claim 6, characterized in that: The projection device further comprises a housing, the housing having a housing cavity, the optical unit is installed in the housing cavity, and the housing is provided with a through hole opposite to the projection lens of the optical unit; The shading member further comprises a second light-transmitting portion, and a mounting portion arranged at the periphery of the second light-transmitting portion and the light-shielding portion. The mounting portion is arranged in a ring shape and is rotatably mounted on the through hole.

8. The projection device according to claim 5, characterized in that: The projection device further comprises a positioning structure, and the positioning structure is used for positioning the shading member and the optical unit when the shading portion is in the shading position.

9. The projection device according to claim 4, characterized in that: The shading member is detachably disposed on the projection lens; or, The projection device further comprises a housing, wherein the housing has a receiving cavity, the optical unit is installed in the receiving cavity, and the shading member is detachably arranged on the outer side of the housing.

10. The projection device according to claim 4, characterized in that: The shape of the first light-transmitting portion matches the shape of the projection screen of the optical unit.

Images