Elastic sheet mechanism, pixel expansion device and projection display equipment

Abstract

The utility model relates to the technical field of projection display, in particular to an elastic piece mechanism, a pixel expansion device and projection display equipment, the elastic piece mechanism comprises an outer frame, an inner frame and a cantilever, the middle of the outer frame is provided with an accommodating hole, and the outer frame is provided with a first frame surrounding the accommodating hole; the inner frame is located in the containing hole of the outer frame and provided with a second frame opposite to the first frame, the cantilever is provided with a first connecting point, a second connecting point and a turning part arranged between the first connecting point and the second connecting point, the first connecting point is connected with the first frame, and the second connecting point is connected with the second frame. The elastic sheet mechanism can improve the space utilization rate of the cantilever, so that the size of the whole device can be reduced.

Description

Technical Field

[0001] The present application relates to the field of projection display technology, and in particular to a spring mechanism, a pixel expansion device and a projection display equipment. Background Art

[0002] The pixel expansion device includes an optical actuator and an optical element. The optical actuator is used to adjust the optical element, thereby adjusting the pixel resolution of the image. The optical actuator drives the optical element to adjust the angle through the cooperation of a magnet and an energized coil. The optical element can swing within a certain range through the cantilever of the shrapnel mechanism. However, the cantilever of the existing shrapnel mechanism occupies a large space, making the overall device larger. Utility Model Content

[0003] The purpose of the present application is to provide a spring mechanism, a pixel expansion device and a projection display device, wherein the spring mechanism can improve the space utilization of the cantilever, thereby reducing the volume of the overall device.

[0004] To this end, on the first aspect, an embodiment of the present application provides a spring mechanism, comprising: an outer frame, a receiving hole is provided in the middle of the outer frame, and the outer frame has a first frame surrounding the receiving hole; an inner frame is located in the receiving hole of the outer frame, and the inner frame has a second frame arranged opposite to the first frame, and a cantilever, the cantilever has a first connection point, a second connection point and a folding portion arranged between the first connection point and the second connection point, the first connection point is connected to the first frame, and the second connection point is connected to the second frame.

[0005] In a possible implementation, a first avoidance groove for accommodating the cantilever is provided on the first side frame of the outer frame; and / or a second avoidance groove for accommodating the cantilever is provided on the second side frame of the inner frame.

[0006] In a possible implementation manner, the turning portion includes a first turning portion adjacent to the first connection point and a second turning portion adjacent to the second connection point.

[0007] In a possible implementation, the folding portion further includes a third folding portion located between the first folding portion and the second folding portion, and the first folding portion, the second folding portion and the third folding portion make the cantilever present an "S"-shaped structure.

[0008] On the second aspect, an embodiment of the present application provides a pixel expansion device, including: the above-mentioned spring mechanism; a substrate, connected to the outer frame of the spring mechanism; an optical element, arranged on the inner frame of the spring mechanism; and a magnet assembly and a coil, one of the magnet assembly and the coil is arranged on the substrate, and the other is arranged on the inner frame, the coil is electrically connected to the substrate, and the electromagnetic force generated by the coil acts on the magnet assembly to drive the optical element to swing along a preset direction.

[0009] In a possible implementation, the inner frame has a fixing surface for mounting the optical element, the magnet assembly and the coil are respectively perpendicular to the fixing surface of the inner frame, and the magnet assembly and the coil are arranged in parallel.

[0010] In a possible implementation, four magnet assemblies and four coils are provided respectively, and the four magnet assemblies are respectively provided on the four second side frames of the inner frame.

[0011] In one possible implementation, the magnet assembly includes a first magnet and a second magnet arranged in parallel, the polarity of the first magnet is opposite to the polarity of the second magnet; the coil is a ring structure, the coil has a first long side aligned with the first magnet and a second long side aligned with the second magnet, and the direction of current in the first long side is opposite to the direction of current in the second long side.

[0012] In a possible implementation, the magnet assembly further includes a connecting portion disposed between the first magnet and the second magnet, and the connecting portion is a non-magnetic area.

[0013] In a third aspect, an embodiment of the present application provides a projection display device, including a light source for generating an incident light beam; and the above-mentioned pixel expansion device, which is arranged on the light path of the light source.

[0014] According to the spring mechanism, pixel expansion device and projection display equipment provided in the embodiments of the present application, the spring mechanism connects the first frame of the outer frame and the second frame of the inner frame through a cantilever, and the cantilever further reduces the distance between the inner frame and the outer frame on the basis of ensuring the length between the first connection point and the second connection point through a folding portion, thereby improving the space utilization of the cantilever and reducing the volume of the overall device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0016] In order to more clearly illustrate the embodiments of the present invention 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0018] Figure 1A schematic structural diagram of a spring mechanism provided in an embodiment of the present application is shown;

[0019] Figure 2 A partial enlarged structural schematic diagram of a cantilever provided in an embodiment of the present application is shown;

[0020] Figure 3 A schematic diagram of the three-dimensional structure of a pixel expansion device provided in an embodiment of the present application is shown;

[0021] Figure 4 Show Figure 3 A schematic diagram of the three-dimensional structure of the pixel expansion device from another angle;

[0022] Figure 5 A schematic diagram of an exploded structure of a pixel expansion device provided in an embodiment of the present application is shown;

[0023] Figure 6 A schematic diagram of a three-dimensional structure of a substrate provided in an embodiment of the present application is shown;

[0024] Figure 7 A schematic diagram of a three-dimensional structure of an optical element, a magnet assembly and a coil provided in an embodiment of the present application is shown;

[0025] Figure 8 A schematic diagram of an exploded structure of a magnet assembly and a coil provided in an embodiment of the present application is shown;

[0026] Fig. 9 A schematic cross-sectional structure diagram of a magnet assembly and a coil provided in an embodiment of the present application is shown;

[0027] Fig.10 A schematic diagram of the structure of an optical element provided by an embodiment of the present application when it is swinging is shown.

[0028] Description of reference numerals:

[0029] X, first direction; Y, second direction;

[0030] 1. outer frame; 11. first frame; 12. first avoidance groove; 13. positioning hole;

[0031] 2. inner frame; 21. second frame; 22. second avoidance groove; 23. fixing surface;

[0032] 3. Cantilever; 31. First connection point; 32. Second connection point; 33. First turning portion; 34. Second turning portion; 35. Third turning portion;

[0033] 4. substrate; 41. positioning column; 42. positioning slot; 43. flexible circuit board;

[0034] 5. Optical components;

[0035] 6. Magnet assembly; 61. First magnet; 62. Second magnet; 63. Connecting portion;

[0036] 7, coil; 71, first long side; 72, second long side; 73, short side. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] The disclosure below provides many different embodiments or examples to realize the different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present application. In addition, the embodiments of the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0039] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0040] In order to solve the problems in the prior art, the present application provides a spring mechanism, which can improve the space utilization of the cantilever, thereby reducing the volume of the overall device.

[0041] like Figure 1-2As shown, an embodiment of the present application provides a spring mechanism, including an outer frame 1, an inner frame 2 and four cantilevers 3.

[0042] A receiving hole is provided in the middle of the outer frame 1 , and the outer frame 1 has a first frame 11 surrounding the receiving hole.

[0043] The inner frame 2 is located in the receiving hole of the outer frame 1, and the inner frame 2 has a second frame 21 arranged opposite to the first frame 11.

[0044] The cantilever 3 has a first connection point 31 , a second connection point 32 and a folding portion disposed between the first connection point 31 and the second connection point 32 . The first connection point 31 is connected to the first frame 11 , and the second connection point 32 is connected to the second frame 21 .

[0045] Specifically, the outer frame 1 is a square structure, the inner frame 2 is a square structure, the inner frame 2 is located inside the outer frame 1, the four first frames 11 on the inner side of the outer frame 1 correspond one by one to the four second frames 21 on the outer side of the inner frame 2, respectively, the cantilever 3 is used to connect the first frames 11 and the second frames 21 which are arranged relatively, the outer frame 1 is used to fix the spring mechanism, the inner frame 2 is installed with the optical element 5, and the optical element 5 can be swung and adjusted with the inner frame 2 through the cantilever 3, and the cantilever 3 acts as a spring, which provides a restoring force for the movement on the one hand, and on the other hand, the specific structure of the cantilever 3 can form a specific natural frequency of the mover.

[0046] Optionally, the outer frame 1 and the inner frame 2 may also be polygons, such as triangles, pentagons, hexagons, octagons, etc. The number of first borders 11 is equal to the number of second borders 21 , and the first borders 11 and the second borders 21 are connected by a cantilever 3 .

[0047] In the above-mentioned embodiments, the number of the cantilever walls 3 may be two or more, and is not limited to four cantilever walls, such as 3, 6, 8, etc.

[0048] In another embodiment of the present application, the number of first frames 11 and second frames 21 is equal, and some of the first frames 11 and second frames 21 are connected by the cantilever 3. For example, the number of first frames 11 and second frames 21 is 8, of which four groups of first frames 11 and second frames 21 are connected by the cantilever 3, and the other four groups of first frames 11 and second frames 21 are separately arranged. The separately arranged first frames 11 and second frames 21 are spaced apart from the first frames 11 and second frames 21 connected by the cantilever 3 to ensure uniformity of force between the outer frame 1 and the inner frame 2.

[0049] In the present application, the first side frame 11 of the outer frame 1 and the second side frame 21 of the inner frame 2 are connected by the cantilever 3, and the cantilever 3 further reduces the distance between the inner frame 2 and the outer frame 1 on the basis of ensuring the length between the first connection point 31 and the second connection point 32 through the folding portion, thereby improving the space utilization of the cantilever 3, thereby reducing the volume of the overall device.

[0050] In the related art, the inner frame 2 and the outer frame 1 of the spring mechanism are connected by a cantilever 3. The cantilever 3 needs to have a certain length to ensure that it has sufficient elasticity so that the inner frame 2 and the optical element 5 can be adjusted within a certain angle range. The cantilever 3 directly set will take up a large space, thereby making the volume of the entire spring mechanism larger, thereby making the volume of the overall device larger. Some spring mechanisms also set the cantilever 3 at the four end corners. In order to ensure that the cantilever 3 has a sufficient length, the cantilever 3 needs to be bent multiple times, which will also take up a large space.

[0051] In the present application, by setting the cantilever 3 between the first frame 11 of the outer frame 1 and the second frame 21 of the inner frame 2, the length requirement of the cantilever 3 can be conveniently met, and the space utilization rate of the cantilever 3 can be further improved by the folding portion, so that the overall device volume can be reduced.

[0052] In some embodiments, a first avoidance groove 12 for accommodating the cantilever 3 is provided on the first side frame 11 of the outer frame 1 ; and / or a second avoidance groove 22 for accommodating the cantilever 3 is provided on the second side frame 21 of the inner frame 2 .

[0053] In one embodiment, a first avoidance groove 12 is provided on the first side frame 11 of the outer frame 1, and the first avoidance groove 12 is used to avoid at least a portion of the cantilever 3, thereby further shortening the distance between the first side frame 11 and the second side frame 21; in another embodiment, a second avoidance groove 22 is provided on the second side frame 21 of the inner frame 2, and the second avoidance groove 22 is used to avoid at least a portion of the cantilever 3, thereby further shortening the distance between the first side frame 11 and the second side frame 21; in yet another embodiment, a first avoidance groove 12 is provided on the first side frame 11, and a second avoidance groove 22 is provided on the second side frame 21, and the first avoidance groove 12 and the second avoidance groove 22 are respectively used to avoid at least a portion of the cantilever 3, thereby further shortening the distance between the first side frame 11 and the second side frame 21.

[0054] Preferably, the first frame 11 has a first avoidance groove 12, and the second frame 21 is provided with a second avoidance groove 22. The first avoidance groove 12 and the second avoidance groove 22 are used together to avoid the cantilever 3. Because the optical element 5 also needs to be fixed on the second frame 21, the first avoidance groove 12 is larger and the second avoidance groove 22 is relatively smaller.

[0055] In some embodiments, the turning portion includes a first turning portion 33 adjacent to the first connection point 31 and a second turning portion 34 adjacent to the second connection point 32 .

[0056] In the present application, the first folding portion 33 and the second folding portion 34 are respectively turned 180°, so that the distance between the cantilevers 3 in the width direction is greater than the width of two cantilevers 3 and less than the width of three cantilevers 3, and the first folding portion 33 and the second folding portion 34 can make the first connection point 31 and the second connection point 32 as close as possible, thereby ensuring the stability of the inner frame 2.

[0057] In some embodiments, the folding portion further includes a third folding portion 35 located between the first folding portion 33 and the second folding portion 34. The first folding portion 33, the second folding portion 34 and the third folding portion 35 make the cantilever 3 present an "S"-shaped structure.

[0058] In the present application, the second folding portion 34 between the first folding portion 33 and the second folding portion 34 is an oblique turn, which can avoid the first connection point 31 and the second connection point 32 to avoid interference between the first connection point 31 and the second connection point 32, thereby ensuring the effective length of the cantilever 3 while also ensuring the distance of the cantilever 3 in the width direction, thereby reducing the overall size of the spring mechanism.

[0059] In the related art, the cantilever 3 of some spring clip mechanisms also adopts a reciprocating folding structure, similar to a "U"-shaped structure, but this reciprocating folding structure still occupies a large space. For example, the width direction distance of two U-shaped structures is greater than the width of three cantilevers 3, and it also limits the width of the cantilever 3. The reduction in the width of the cantilever 3 will affect the anti-deformation ability. In the present application, by setting a third folding portion 35 between the first folding portion 33 and the second folding portion 34, the entire spring clip mechanism is in an "S"-shaped structure. Similarly, in the case of two folding portions, the distance of the cantilever 3 in the width direction can be less than three times the width of the cantilever 3, so that the width of the cantilever 3 can be made wider. The wider the cantilever 3 is, the better the anti-deformation ability is. The spring clip mechanism increases the K value in the horizontal direction in design, which improves the horizontal anti-resonance ability and is more suitable for environments with strong vibrations.

[0060] The spring mechanism connects the first frame 11 of the outer frame 1 and the second frame 21 of the inner frame 2 through the cantilever 3, and the cantilever 3 further reduces the distance between the inner frame 2 and the outer frame 1 through the folding portion while ensuring the length between the first connection point 31 and the second connection point 32, thereby improving the space utilization of the cantilever 3 and reducing the volume of the overall device.

[0061] like Figure 3-10As shown, an embodiment of the present application provides a pixel expansion device, including: the above-mentioned spring mechanism; a substrate 4, connected to the outer frame 1 of the spring mechanism; an optical element 5, arranged on the inner frame 2 of the spring mechanism; and a magnet assembly 6 and a coil 7, one of the magnet assembly 6 and the coil 7 is arranged on the substrate 4, and the other is arranged on the inner frame 2, the coil 7 is electrically connected to the substrate 4, and the electromagnetic force generated by the coil 7 acts on the magnet assembly 6 to drive the optical element 5 to swing along a preset direction.

[0062] In the present application, the electromagnetic force generated by the coil 7 acts on the magnet assembly 6 to drive the inner frame 2 of the spring mechanism to swing along a preset direction, thereby driving the optical element 5 to swing along the preset direction.

[0063] In some embodiments, the inner frame 2 has a fixing surface 23 for mounting the optical element 5 , the magnet assembly 6 and the coil 7 are respectively perpendicular to the fixing surface 23 of the inner frame 2 , and the magnet assembly 6 and the coil 7 are arranged in parallel.

[0064] In the present application, by placing the magnet assembly 6 and the coil 7 perpendicular to the fixing surface 23 of the fixing part, compared with the situation in which the magnet assembly 6 and the coil 7 are placed horizontally in the prior art, the electromagnetic force generated by the coil 7 can be fully utilized to drive the optical element 5, and a greater electromagnetic force can be generated under the same current, thereby improving the electromagnetic utilization efficiency.

[0065] Specifically, the spring mechanism has a certain elasticity. When the coil 7 is energized, it generates electromagnetic force. The coil 7 is located in the magnetic field of the magnet assembly 6. The electromagnetic force generated by the coil 7 acts on the magnet assembly 6, thereby driving the fixing part to swing. The fixing part drives the optical assembly to swing, thereby completing the adjustment of the tilt angle of the optical assembly.

[0066] In the related art, the existing spring mechanism magnet assembly 6 and coil 7 are generally placed horizontally up and down. In order to ensure that the electromagnetic force is in the up and down direction, the electromagnetic force can only be a horizontal component, so that the magnetic field strength will be weakened and the electromagnetic force will be smaller.

[0067] In the present application, by placing the magnet assembly 6 and the coil 7 perpendicular to the installation plane of the substrate 4, that is, the magnet assembly 6 and the coil 7 are installed vertically, the electromagnetic force generated by the coil 7 is in the horizontal direction, so that the generated electromagnetic force can be fully utilized for the adjustment of the light-transmitting component, and a greater electromagnetic force can be generated under the same current, thereby improving the utilization efficiency of the electromagnetic.

[0068] In some embodiments, four magnet assemblies 6 and four coils 7 are respectively provided, and the four magnet assemblies 6 are respectively provided on the four second side frames 21 of the inner frame 2 .

[0069] like Fig.10As shown, in the present application, four magnet assemblies 6 and four coils 7 are respectively provided, and the four magnet assemblies 6 are respectively provided around the optical element 5, and the four coils 7 are respectively provided around the optical element 5. The four magnet assemblies 6 correspond to the four coils 7 one by one, and one magnet assembly 6 and one coil 7 constitute a driving unit. Assuming that the surface of the optical element 5 is a horizontal plane, a first direction X and a second direction Y perpendicular to each other are set in the horizontal plane, and two driving units are respectively located on both sides of the optical element 5 along the first direction X, and the optical element 5 is controlled to swing with the first direction X as the swing axis through these two driving units; the other two driving units are respectively located on both sides of the optical element 5 along the second direction Y, and the optical element 5 is controlled to swing with the second direction Y as the swing axis through the two driving units. In this way, the optical element 5 can be swung and adjusted at any angle around the center point.

[0070] like Figure 8-9 As shown, in some embodiments, the magnet assembly 6 includes a first magnet 61 and a second magnet 62 arranged in parallel, and the polarity of the first magnet 61 is opposite to the polarity of the second magnet 62; the coil 7 is a ring structure, and the coil 7 has a first long side 71 aligned with the first magnet 61 and a second long side 72 aligned with the second magnet 62, and the current direction in the first long side 71 is opposite to the current direction in the second long side 72.

[0071] In the present application, the polarities of the first magnet 61 and the second magnet 62 are opposite, that is, the N pole of the first magnet 61 and the S pole of the second magnet 62 are located on the same side, and the S pole of the first magnet 61 and the N pole of the second magnet 62 are located on the same side. The first long side 71 of the coil 7 is aligned with the first magnet 61, and the second long side 72 is aligned with the second magnet 62. The coil 7 is a ring-shaped structure, and the direction of the current in the first long side 71 is opposite to the direction of the current in the second long side 72. After power is turned on, the electromagnetic force generated by the first long side 71 and the first force generated by the first magnet 61, and the electromagnetic force generated by the second long side 72 and the second force generated by the second magnet 62, finally, the electromagnetic force exerted on the entire coil 7 or the magnet assembly 6 is superimposed in the same direction, further improving the utilization efficiency of the electromagnetic.

[0072] In some embodiments, the magnet assembly 6 further includes a connecting portion 63 disposed between the first magnet 61 and the second magnet 62 , and the connecting portion 63 is a non-magnetic area.

[0073] In the present application, the magnet assembly 6 is an integral structure, and the first magnet 61 and the second magnet 62 are separated by the connection portion 63 of the non-magnetic area, so that the first magnet 61 and the second magnet 62 are independent of each other. By setting the magnet assembly 6 as an integral structure, the entire magnet assembly 6 only needs to be bonded to the spring mechanism, which is convenient for assembly and ensures the stability of the magnetic field when the magnet assembly 6 is working. No more details are given for the non-magnetic area of ​​the magnet assembly 6.

[0074] Specifically, the coil 7 further has a short side 73 for connecting the first long side 71 and the second long side 72 .

[0075] Optionally, the first magnet 61 and the second magnet 62 of the magnet assembly 6 may also be two relatively independent pieces, with a magnetic isolation plate in between for magnetic isolation.

[0076] In some embodiments, the gap between the magnet assembly 6 and the coil 7 is 0.15 mm-0.2 mm.

[0077] In the related art, in the existing galvanometer solution, the magnet assembly 6 and the coil 7 are placed horizontally up and down. In order to ensure the movement gap, the gap between the coil 7 and the magnet assembly 6 is generally above 0.5 mm, and the electromagnetic force is relatively weak at this distance.

[0078] In the present application, by arranging both the magnet assembly 6 and the coil 7 vertically and adjusting the light-transmitting member in the horizontal plane, the gap between the magnet assembly 6 and the coil 7 can be effectively reduced. By reducing the gap between the magnet assembly 6 and the coil 7 to 0.15mm-0.2mm and placing them vertically, the magnetic field strength generated by the magnet assembly 6 at this distance range is stronger. When the same current I is passed through the coil 7, according to F=BIL, the corresponding electromagnetic force generated is much larger than that at other positions, thereby further improving the electromagnetic force.

[0079] In some embodiments, the magnet assembly 6 is disposed on the spring mechanism and around the optical element 5 , and the coil 7 is disposed on the substrate 4 and around the optical element 5 .

[0080] Specifically, a flexible circuit board 43 is connected to the substrate 4, and the coil 7 is electrically connected to the flexible circuit board 43. The coil 7 can be an enameled wire hollow coil 7, or a coil 7 etched by a PCB or FPC.

[0081] In the present application, the magnet assembly 6 and the coil 7 are both arranged around the optical element 5, the magnet assembly 6 is arranged on the spring mechanism, and the coil 7 is arranged on the substrate 4, and the electromagnetic force generated by the coil 7 generates a force of attraction or repulsion with the magnet assembly 6, thereby swinging the spring mechanism and the optical element 5 on the spring mechanism, thereby completing the adjustment of the tilt angle of the optical element 5. Specifically, by arranging the magnet assembly 6 and the optical element 5 around the optical element 5, the tilt angle of the optical element 5 can be adjusted at different angles in the horizontal plane.

[0082] Optionally, the coil 7 may be arranged on the spring mechanism and the magnet assembly 6 may be arranged on the substrate 4, which may have the same effect. In the present application, the coil 7 is arranged on the substrate 4 because the coil 7 is electrically connected to the substrate 4, which facilitates assembly.

[0083] In some embodiments, the magnet assembly 6 is located between the coil 7 and the optical element 5; alternatively, the coil 7 is located between the magnet assembly 6 and the optical element 5.

[0084] In the present application, the magnet assembly 6 is located between the coil 7 and the optical element 5, and the electromagnetic force generated by the coil 7 acts on the magnet assembly 6, thereby driving the spring mechanism and the optical element 5 to complete the adjustment of the tilt angle. Of course, the coil 7 is arranged between the magnet assembly 6 and the optical element 5, which can also achieve the same technical effect.

[0085] In some embodiments, a positioning hole 13 is provided on the outer frame 1 , and a positioning column 41 for inserting into the positioning hole 13 is provided on the substrate 4 ; a positioning slot 42 is also provided on the substrate 4 , and the positioning slot 42 is used to position the magnet assembly 6 or the coil 7 .

[0086] In the related art, the existing spring mechanism has a relatively simple structural component positioning relationship, poor assembly processability, and requires the use of a large number of auxiliary jigs for positioning during assembly.

[0087] In the embodiment of the present application, the positioning column 41 on the substrate 4 is inserted into the positioning hole 13 of the outer frame 1 to complete the positioning assembly of the substrate 4 and the spring mechanism. The coil 7 is a fixed shape and is positioned by the positioning slot 42. The optical component and the magnet component 6 are fixed to the spring mechanism by glue, which reduces the use of auxiliary jigs during assembly.

[0088] An embodiment of the present application provides a projection display device, including a light source for generating an incident light beam; and the above-mentioned pixel expansion device, which is arranged on the light path of the light source.

[0089] In the present application, the pixel expansion device is arranged on the optical path of the light source, and the actuator drives the optical element to swing along a preset angle, thereby adjusting the pixels and improving the projection resolution of the projection display device.

[0090] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0091] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0092] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A spring mechanism, characterized in that: include: An outer frame (1), a receiving hole being arranged in the middle of the outer frame (1), and the outer frame (1) having a first frame (11) surrounding the receiving hole; an inner frame (2) located in the receiving hole of the outer frame (1), the inner frame (2) having a second frame (21) arranged opposite to the first frame (11); and A cantilever (3), the cantilever (3) comprising a first connection point (31), a second connection point (32), and a folding portion arranged between the first connection point (31) and the second connection point (32), the first connection point (31) being connected to the first frame (11), and the second connection point (32) being connected to the second frame (21).

2. The spring mechanism according to claim 1, characterized in that: A first avoidance groove (12) for accommodating the cantilever (3) is provided on the first side frame (11) of the outer frame (1); and / or A second avoidance groove (22) for accommodating the cantilever (3) is provided on the second side frame (21) of the inner frame (2).

3. The spring mechanism according to claim 1 or 2, characterized in that: The folding portion comprises a first folding portion (33) adjacent to the first connection point (31) and a second folding portion (34) adjacent to the second connection point (32).

4. The spring mechanism according to claim 3, characterized in that: The folding portion further comprises a third folding portion (35) located between the first folding portion (33) and the second folding portion (34); the first folding portion (33), the second folding portion (34) and the third folding portion (35) enable the cantilever (3) to present an "S"-shaped structure.

5. A pixel expansion device, characterized in that: include: The spring mechanism according to any one of claims 1 to 4; A base plate (4) connected to the outer frame (1) of the spring mechanism; an optical element (5) arranged on the inner frame (2) of the spring mechanism; and A magnet assembly (6) and a coil (7), wherein one of the magnet assembly (6) and the coil (7) is arranged on the substrate (4), and the other is arranged on the inner frame (2); the coil (7) is electrically connected to the substrate (4); the electromagnetic force generated by the coil (7) acts on the magnet assembly (6) to drive the optical element (5) to swing along a preset direction.

6. The pixel expansion device according to claim 5, characterized in that: The inner frame (2) has a fixing surface (23) for mounting the optical element (5), the magnet assembly (6) and the coil (7) are respectively perpendicular to the fixing surface (23) of the inner frame (2), and the magnet assembly (6) and the coil (7) are arranged in parallel.

7. The pixel expansion device according to claim 5, characterized in that: Four of the magnet assemblies (6) and four of the coils (7) are provided, respectively, and the four magnet assemblies (6) are respectively provided on the four second side frames (21) of the inner frame (2).

8. The pixel expansion device according to claim 5, characterized in that: The magnet assembly (6) comprises a first magnet (61) and a second magnet (62) which are arranged in parallel, and the polarity of the first magnet (61) is opposite to the polarity of the second magnet (62); The coil (7) is a ring-shaped structure, and has a first long side (71) aligned with the first magnet (61) and a second long side (72) aligned with the second magnet (62), and the direction of current in the first long side (71) is opposite to the direction of current in the second long side (72).

9. The pixel expansion device according to claim 8, characterized in that: The magnet assembly (6) further comprises a connecting portion (63) arranged between the first magnet (61) and the second magnet (62), wherein the connecting portion (63) is a non-magnetic area.

10. A projection display device, characterized in that: include: a light source for generating an incident light beam; as well as The pixel expansion device as described in any one of claims 5 to 9 is arranged in the light path of the light source.

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