Aperture structure and projection lens

Abstract

The utility model discloses an aperture structure and a projection lens, the aperture structure comprises an aperture seat, a plurality of blades and a driving mechanism, the middle part of the aperture seat is provided with a through hole along the front and back direction; each blade is arranged in an arc shape so as to be provided with a connecting end and a driving end which are oppositely arranged in the arc length direction, the multiple blades are arranged at intervals in the circumferential direction of the aperture seat, the driving ends of the multiple blades can at least partially shield the through hole in the swinging process, the multiple blades jointly define an aperture opening, and the diameter of the aperture opening is adjustable; the first driving gear is annularly arranged, an inner hole of the first driving gear and the aperture opening are aligned in the front-back direction, a plurality of driving grooves distributed at intervals are formed in the circumferential side face of the first driving gear, and the driving ends of the blades are rotationally connected with the driving grooves. The multiple driving rotating shafts are driven to rotate around the connecting ends of the corresponding blades so as to adjust the size of the aperture opening, and the problems that an existing aperture structure is high in material cost and large in appearance size are solved.

Description

Technical Field

[0001] This utility model relates to the field of imaging technology, and in particular to aperture structure and projection lens. Background Technology

[0002] With the continuous development of projection technology and the expansion of application scenarios, the market size is also constantly growing. Against this backdrop, the upgrading and iteration of projection lenses is also accelerating. Some high-end projection lenses have begun to adopt "dynamic iris" technology, which requires the use of a variable aperture to adjust the amount of light entering the lens, thereby improving the contrast and brightness of the projected image.

[0003] However, the brightness of projection lens light sources is constantly increasing, necessitating the use of an all-metal structure for the lens aperture to prevent burns and damage. Existing all-metal apertures are often machined or die-cast and then machined, resulting in high aperture costs and significantly increasing the overall projector cost. Utility Model Content

[0004] The main purpose of this invention is to propose an aperture structure that aims to solve the problems of high material cost and large size of existing apertures.

[0005] To achieve the above objectives, this utility model proposes an aperture structure, wherein the aperture structure includes:

[0006] An aperture mount, wherein a through hole is provided in the center of the aperture mount along the front-to-back direction;

[0007] Multiple blades, each arranged in an arc shape, have a connecting end and a driving end arranged opposite each other along its arc length direction. The multiple blades are spaced apart circumferentially along the aperture holder, and the connecting ends of each blade are rotatably mounted on the aperture holder about a front-to-back rotating axis. The driving ends of the multiple blades can at least partially block the through-hole during oscillation. The multiple blades together form an aperture opening, and the diameter of the aperture opening is adjustable.

[0008] The driving mechanism includes a first driving gear rotatably disposed relative to the aperture seat. The first driving gear is arranged in a ring shape, and the inner hole of the first driving gear is aligned with the aperture opening from front to back and upward. The peripheral side of the first driving gear is provided with a plurality of driving grooves arranged at intervals. The plurality of driving grooves are rotatably connected to the driving ends of a plurality of blades. During the rotation stroke of the first driving gear, the plurality of driving shafts are driven to rotate around the connecting ends of the corresponding blades to adjust the size of the aperture opening.

[0009] In one embodiment, the drive mechanism further includes a drive motor having an output shaft extending in a front-rear direction, and a second drive gear is disposed on the output shaft, the second drive gear meshing with the first transmission gear.

[0010] In one embodiment, the drive mechanism further includes a drive motor having an output shaft extending in a front-rear direction, and a second drive gear is disposed on the output shaft;

[0011] The drive mechanism further includes a rotatable transmission gear, the rotation axis of which extends in the front-rear direction, and the second drive gear meshes with the first drive gear through the transmission gear;

[0012] The first drive gear, the transmission gear, and the second drive gear are arranged sequentially in the left-right direction.

[0013] In one embodiment, the front side of the aperture seat is recessed with a mounting groove, and the bottom of the mounting groove is provided with the through hole;

[0014] The plurality of blades and the first drive gear are all disposed in the mounting groove, and the first drive gear is disposed on the side of the plurality of blades opposite to the bottom of the mounting groove.

[0015] In one embodiment, the bottom of the mounting groove is recessed with an arc-shaped limiting groove, which extends circumferentially along the aperture seat;

[0016] The rear end face of the first drive gear is provided with a limiting block, which is engaged in the limiting groove and can rotate around the aperture seat in the circumference within the limiting groove to limit the rotation angle of the first drive gear.

[0017] In one embodiment, the bottom of the mounting groove is provided with a plurality of connecting holes, and the plurality of connecting holes are arranged at intervals along the circumference of the aperture seat;

[0018] Each blade has a connecting shaft extending in the front-rear direction on the side facing the aperture seat. Each connecting shaft is rotatably mounted in a corresponding connecting hole. Each blade has a driving shaft on the side facing the first driving gear.

[0019] In one embodiment, the base extends in a left-right direction and has a connecting hole corresponding to the through hole, the connecting hole being used to transmit light through the through hole;

[0020] The aperture mount and the drive mechanism are mounted on the base.

[0021] In one embodiment, a positioning hole is provided on the left side of the base;

[0022] The aperture structure also includes a positioning element, which is disposed on the outer peripheral wall of the aperture seat and extends in the left and right direction. A positioning block is protruding from the rear end face of the positioning element, and the positioning block is engaged in the positioning hole.

[0023] In one embodiment, the aperture structure further includes a cover plate that covers the aperture seat, the plurality of blades, and the drive mechanism.

[0024] This utility model also provides a projection lens, the projection lens including the above-mentioned aperture structure, the aperture structure including:

[0025] An aperture mount, wherein a through hole is provided in the center of the aperture mount along the front-to-back direction;

[0026] Multiple blades, each arranged in an arc shape, have a connecting end and a driving end arranged opposite each other along its arc length direction. The multiple blades are spaced apart circumferentially along the aperture holder, and the connecting ends of each blade are rotatably mounted on the aperture holder about a front-to-back rotating axis. The driving ends of the multiple blades can at least partially block the through-hole during oscillation. The multiple blades together form an aperture opening, and the diameter of the aperture opening is adjustable.

[0027] The driving mechanism includes a first driving gear rotatably disposed relative to the aperture seat. The first driving gear is arranged in a ring shape, and the inner hole of the first driving gear is aligned with the aperture opening from front to back and upward. The peripheral side of the first driving gear is provided with a plurality of driving grooves arranged at intervals. The plurality of driving grooves are rotatably connected to the driving ends of a plurality of blades. During the rotation stroke of the first driving gear, the plurality of driving shafts are driven to rotate around the connecting ends of the corresponding blades to adjust the size of the aperture opening.

[0028] In the technical solution provided by this utility model, by adjusting the driving end of the blade to rotate around the connecting end of the blade, and with the connecting end and driving end of each blade respectively located on both sides of the through hole in its radial direction, the driving stroke for driving the first driving gear to rotate can be longer when adjusting the aperture size. Thus, when the first driving gear is driven to rotate by the gear, the transmission structure does not need to be set with a multi-stage transmission structure. In addition, the aperture seat and each blade have a simple structure and can be directly stamped, which greatly reduces the cost of the all-metal aperture and solves the problems of high material cost and large size of existing apertures. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 An exploded view of an embodiment of the aperture structure provided by this utility model;

[0031] Figure 2 for Figure 1 A schematic diagram of the rear side structure of the aperture structure in the image.

[0032] Explanation of icon numbers:

[0033] 100. Aperture structure; 1. Aperture seat; 11. Through hole; 12. Mounting slot; 13. Connecting hole; 14. Arc-shaped limiting slot; 2. Blade; 21. Connecting end; 22. Driving end; 23. Driving shaft; 24. Connecting shaft; 3. First driving gear; 31. Driving slot; 32. Limiting block; 4. Driving motor; 41. Output shaft; 42. Second driving gear; 5. Transmission gear; 6. Base; 61. Connecting hole; 62. Positioning hole; 7. Positioning component; 71. Positioning block; 8. Cover plate.

[0034] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] With the continuous development of projection technology and the expansion of application scenarios, the market size is also constantly growing. Against this backdrop, the upgrading and iteration of projection lenses is accelerating. Some high-end projection lenses have begun to adopt "dynamic iris" technology, which requires a variable aperture to adjust the amount of light entering the lens, improving the contrast and brightness of the projected image. However, the brightness of the projection lens light source is also constantly increasing, necessitating the use of an all-metal structure for the lens's internal aperture to avoid burn-in and damage. Existing all-metal apertures are often machined or die-cast and then machined, resulting in high aperture costs and a significant increase in the overall projector cost.

[0039] To solve the above problems, this utility model provides an aperture structure 100.

[0040] Please see Figures 1 to 2The aperture structure 100 includes an aperture seat 1, multiple blades 2, and a drive mechanism. The aperture seat 1 has a through hole 11 extending longitudinally through its center. Each blade 2 is arc-shaped, having a connecting end 21 and a driving end 22 arranged opposite each other along its arc length. The multiple blades 2 are spaced apart circumferentially along the aperture seat 1, and the connecting end 21 of each blade 2 is rotatably mounted on the aperture seat 1 about a front-to-back rotating axis. The driving ends 22 of the multiple blades 2 can at least partially block the through hole 11 during oscillation. The multiple blades 2 together form an aperture opening. The diameter of the aperture is adjustable; the driving mechanism includes a first driving gear 3 rotatably disposed relative to the aperture seat 1. The first driving gear 3 is arranged in a ring, and the inner hole of the first driving gear 3 is aligned with the aperture in the front-back upward direction. The peripheral side of the first driving gear 3 is provided with a plurality of driving grooves 31 arranged at intervals. The plurality of driving grooves 31 are rotatably connected to the driving ends 22 of the plurality of blades 2. During the rotation stroke of the first driving gear 3, the plurality of driving shafts 23 are driven to rotate around the connecting ends 21 of the corresponding blades 2 to adjust the size of the aperture.

[0041] The rotation of the first drive gear 3 can be achieved manually or electrically. In manual adjustment, an operating component coaxially arranged with the drive gear can be provided, and the user controls the rotation of the first drive gear 3 by operating the operating component.

[0042] Furthermore, in order to further increase the stroke of the blade 2, the connecting end 21 and the driving end 22 of each blade 2 are respectively located on both sides of the through hole 11 in its radial direction, so that when adjusting the size of the aperture, the driving stroke of driving the first driving gear 3 to rotate can be longer. Thus, when driving the first driving gear 33 to rotate through the gear, the transmission structure does not need to be set with a multi-stage transmission structure, thereby reducing the external size and reducing material costs.

[0043] Furthermore, it is understandable that as the brightness of light sources continues to increase, the aperture inside the lens needs to use an all-metal structure to avoid burns and damage. However, the processing cost of an all-metal structure is high. Therefore, in one embodiment of this utility model, the aperture holder 1 and each of the blades 2 have a simple structure and can be directly stamped, which greatly reduces the cost of the all-metal aperture (BOM cost is reduced by about 4 times) and improves the market competitiveness of the projection lens.

[0044] In the technical solution provided by this utility model, by adjusting the driving end 22 of the blade 2 to rotate around the connecting end 21 of the blade 2, and with the connecting end 21 and driving end 22 of each blade 2 respectively located on both sides of the through hole 11 in its radial direction, the driving stroke for driving the first driving gear 3 to rotate can be longer when adjusting the aperture size. Thus, when the first driving gear 3 is driven to rotate by the gear, the transmission structure does not need to be set with a multi-stage transmission structure. In addition, the aperture seat 1 and each blade 2 have a simple structure and can be directly stamped, which greatly reduces the cost of the all-metal aperture and solves the problems of high material cost and large size of existing apertures.

[0045] In one embodiment of this utility model, the driving mechanism further includes a drive motor 4, which has an output shaft 41 extending in the front-rear direction. A second drive gear 42 is disposed on the output shaft 41, and the second drive gear 42 meshes with the first transmission gear 5. This arrangement provides a physical locking effect between the gears, preventing the aperture blades 2 from moving accidentally due to vibration or other external forces. The drive motor 4 can be a stepper motor or a servo motor, etc., and using the drive motor 4 allows for electric adjustment of the aperture size.

[0046] Furthermore, it should be noted that the transmission ratio between the first drive gear 3 and the second drive gear 42 is relatively large, and the torque on the gear is relatively large. In order to avoid gear damage and increase service life, in one embodiment of this utility model, the drive mechanism further includes a rotatably configured transmission gear 5. The rotation axis of the transmission gear 5 extends in the front-back direction, and the transmission gear 5 meshes with the first drive gear 3.

[0047] Furthermore, to enable the drive motor 4 to more precisely adjust the aperture size, the drive mechanism may also include a position measuring device and a control device. The position measuring device is used to detect the relative position of the first drive gear 3 relative to the aperture. The control device is electrically connected to the position measuring device and the drive motor 4, and is used to control the operation of the drive motor 4 according to the position measuring device. Since the principle of adjusting the aperture size is based on measuring the rotation angle of the first drive gear 3 to calculate the aperture value, a device capable of measuring the rotation angle of the first drive gear 3 is required when the aperture rotates.

[0048] It is understandable that in order to measure the rotation angle of the first drive gear 3, the position of the first drive gear 3 at a certain specific position is used as a reference position for measurement. By driving the first drive gear 3 to this reference position as a benchmark, the correspondence between the required aperture size and the drive angle can be obtained. The control device can control the drive motor 4 to rotate at a suitable angle through the difference between the target angle and the real-time angle to achieve the target aperture value.

[0049] In one embodiment of this utility model, the front side of the aperture holder 1 is recessed with a mounting groove 12, and the bottom of the mounting groove 12 is provided with a through hole 11; the plurality of blades 2 and the first drive gear 3 are all disposed in the mounting groove 12, and the first drive gear 3 is disposed on the side of the plurality of blades 2 opposite to the bottom of the mounting groove 12. Thus, the aperture holder 1 can be regarded as a mounting component for the plurality of blades 2 and the drive mechanism, and the bottom wall and side wall of the mounting groove 12 surround the plurality of blades 2 and the first drive gear 3 to form a protective shell.

[0050] Furthermore, it can be understood that in one embodiment of this utility model, the mounting groove 12 is recessed at the bottom and provided with an arc-shaped limiting groove 14, which extends circumferentially along the aperture seat 1; the rear end face of the first driving gear 3 is provided with a limiting block 32, which is engaged in the limiting groove and can rotate circumferentially along the aperture seat 1 within the limiting groove, thereby limiting the rotation angle of the first driving gear 3; by limiting the extension length of the arc-shaped limiting groove 14, the movement distance of the limiting block 32 in the arc-shaped limiting groove 14 is limited, the rotation angle of the first driving gear 3 is limited, and thus the opening and closing range of the aperture is controlled. In this way, the limiting structure in the prior art is simplified, and the arc-shaped limiting groove 14 is provided circumferentially in the aperture seat 1, without occupying additional space, thereby reducing the overall size.

[0051] Specifically, in one embodiment of this utility model, the bottom of the mounting groove 12 is recessed with a plurality of connecting holes 13, which are spaced apart circumferentially along the aperture seat 1; a connecting shaft 24 extending in the front-rear direction is provided on the side of the connecting end 21 of each blade 2 facing the aperture seat 1, and each connecting shaft 24 is rotatably mounted in a corresponding connecting hole 13; a driving shaft 23 is provided on the side of the driving end 22 of each blade 2 facing the first driving gear 3. It can be understood that, in order to realize the rotation of the blade 2, a positioning post can also be protruded on the bottom of the mounting groove 12, and an insertion hole is provided on the connecting end 21 of each blade 2, and the insertion hole of the blade 2 is inserted into the positioning post.

[0052] In one embodiment of this utility model, the base 6 extends in the left and right direction and is provided with a connecting hole 61 corresponding to the through hole 11. The connecting hole 61 is used to transmit light through the through hole 11. The aperture seat 1 and the driving mechanism are disposed on the base 6, thereby supporting and fixing the aperture seat 1 and the driving mechanism.

[0053] Furthermore, it is understood that during the rotation of the first drive gear 3, the aperture seat 1 will inevitably be driven to rotate, resulting in a decrease in aperture accuracy. Therefore, in one embodiment of this utility model, a positioning hole 62 is provided on the left side of the base 6; the aperture structure 100 also includes a positioning member 7, which is disposed on the outer peripheral wall of the aperture seat 1 and extends in the left and right direction. A positioning block 71 is protruding from the rear end face of the positioning member 7, and the positioning block 71 is engaged in the positioning hole 62. In this way, the positioning block 71 is engaged in the positioning hole 62, thereby restricting the aperture seat 1 from being driven to rotate by the first drive gear 3, and improving the aperture accuracy.

[0054] In one embodiment of the present invention, the aperture structure 100 further includes a cover plate 8, which covers the aperture seat 1, the plurality of blades 2 and the drive mechanism. With this arrangement, the cover plate 8 protects the aperture seat 1, the plurality of blades 2 and the drive mechanism from external damage and improves the lifespan of the aperture structure 100.

[0055] Furthermore, in one embodiment of this utility model, the base plate, positioning component 7, and cover plate 8 can also be formed by stamping, thereby realizing the stamping of the main components and reducing processing costs. Additionally, the positioning hole 62 on the left side of the base 6 can also serve as a stamping positioning hole 62 during stamping, ensuring aperture accuracy while maintaining low cost.

[0056] This utility model also provides a projection lens, which includes the aperture structure described above. The projection lens also includes other components such as a lens and an aperture stop. Since the projection lens includes the aperture structure, the specific structure of which is described in the above embodiments is as described in the above embodiments. Since the aperture structure of this projection lens adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0057] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An aperture structure, characterized by, The application relates to a shutter device, which comprises: a shutter seat, a through hole being arranged in the middle of the shutter seat along the front-to-back direction; a plurality of blades, each of the blades being arranged in an arc shape, so as to have a connecting end and a driving end arranged oppositely along the arc length direction of the blade, the connecting end and the driving end of each blade being arranged on two sides of the through hole along the radial direction of the through hole, the plurality of blades being arranged at intervals along the circumferential direction of the shutter seat, and the connecting end of each blade being rotatably arranged on the shutter seat around a rotation axis extending in the front-to-back direction, the driving end of each blade being capable of at least partially shielding the through hole during swinging, and the plurality of blades collectively forming a shutter opening, and the diameter of the shutter opening being adjustable; a driving mechanism, which comprises a first driving gear rotatably arranged relative to the shutter seat, the first driving gear being arranged in a ring shape, and the inner hole of the first driving gear being arranged in the front-to-back direction in alignment with the shutter opening, a plurality of driving grooves being arranged at intervals on the circumferential side surface of the first driving gear, and the plurality of driving grooves being used for rotatably connecting a plurality of driving shafts, and the plurality of driving shafts being driven to rotate around the connecting end of the corresponding blade during the rotation stroke of the first driving gear, so as to adjust the size of the shutter opening. The driving mechanism further comprises a driving motor, the driving motor having an output shaft extending in the front-to-back direction, and a second driving gear being arranged on the output shaft.

2. The aperture structure of claim 1, wherein, The driving mechanism further comprises a driving motor, the driving motor having an output shaft extending in the front-to-back direction, and a second driving gear being arranged on the output shaft.

3. The aperture structure of claim 1, wherein, The driving mechanism further comprises a driving motor, the driving motor having an output shaft extending in the front-to-back direction, and a second driving gear being arranged on the output shaft. The first driving gear, the transmission gear and the second driving gear are sequentially arranged along the left-to-right direction. The front side of the shutter seat is concavely provided with a mounting groove, and the through hole is arranged in the groove bottom of the mounting groove; 4. The aperture structure of claim 1, wherein, The plurality of blades and the first driving gear are arranged in the mounting groove, and the first driving gear is arranged on the side of the plurality of blades away from the groove bottom of the mounting groove. The groove bottom of the mounting groove is concavely provided with an arc-shaped limiting groove, and the limiting groove extends along the circumferential direction of the shutter seat.

5. The aperture structure of claim 4, wherein, The rear end surface of the first driving gear is convexly provided with a limiting block, the limiting block is clamped in the limiting groove, and the limiting block can rotate in the limiting groove along the circumferential direction of the shutter seat, so as to limit the rotation angle of the first driving gear. The groove bottom of the mounting groove is concavely provided with a plurality of connecting holes, and the plurality of connecting holes are arranged at intervals along the circumferential direction of the shutter seat.

6. The aperture structure of claim 4, wherein, The connecting end of each blade is provided with a connecting rotation shaft extending in the front-to-back direction on the side facing the shutter seat, each connecting rotation shaft is rotatably arranged in a corresponding connecting hole, and the driving end of each blade is provided with the driving shaft on the side facing the first driving gear. The application further relates to a shutter device, which comprises:

7. The aperture structure of claim 1, wherein, a base, the base extending along the left-to-right direction, and being provided with a communication hole corresponding to the through hole, the communication hole being used for transmitting light through the through hole; the shutter seat and the driving mechanism are arranged on the base. A positioning hole is arranged on the left side of the base.

8. The aperture structure of claim 7, wherein, ​ The aperture structure further comprises a positioning member, which is arranged on the outer circumferential wall of the aperture seat and extends in the left-right direction, and a positioning block is protruded on the rear end surface of the positioning member and clamped in the positioning hole.

9. The aperture structure of claim 1, wherein, The aperture structure further comprises a cover plate, which covers the aperture seat, the plurality of blades and the driving mechanism.

10. A projection lens characterized in that, An aperture structure as claimed in any one of claims 1 to 9.

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