Aperture structure and projection lens

Abstract

The invention discloses an aperture structure and a projection lens, the aperture structure comprises an aperture seat, a plurality of blades and a driving mechanism, and the middle part of the aperture seat is provided with a through hole along the front-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] The present invention relates to the field of imaging technology, and in particular to an aperture structure and a projection lens. Background Art

[0002] With the continuous development of projection technology and the expansion of application scenarios, the market size is also growing. In this context, the update and iteration of focal projection lenses are also 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 and improve the contrast and brightness of the projected image.

[0003] However, the brightness of the projection lens light source is also increasing, which means that the internal aperture of the lens needs to be made of all-metal to avoid burns and damage. Existing all-metal apertures are often machined or die-cast and then machined, resulting in high aperture costs, which leads to a significant increase in the cost of the entire projector. Summary of the invention

[0004] The main purpose of the present invention is to provide an aperture structure, aiming to solve the problems of high material cost and large size of the existing aperture.

[0005] To achieve the above object, the present invention proposes an aperture structure, wherein the aperture structure comprises:

[0006] An aperture seat, wherein a through hole is formed in the middle of the aperture seat in the front-to-back direction;

[0007] A plurality of blades, each of which is arranged in an arc shape to have a connecting end and a driving end which are arranged opposite to each other in the arc length direction, the plurality of blades are arranged at intervals along the circumference of the aperture seat, and the connecting end of each blade is rotatably mounted on the aperture seat around a rotation axis extending forward and backward, the driving ends of the plurality of blades can at least partially cover the through hole during the swinging process, the plurality of blades together enclose an aperture opening, and the diameter of the aperture opening is adjustable; and,

[0008] The driving mechanism includes a first driving gear rotatably arranged 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 arranged in front-to-back upward alignment with the aperture, and the peripheral side surface of the first driving gear is provided with a plurality of driving grooves arranged at intervals, and the plurality of driving grooves are used for rotational connection of the driving ends of the 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 corresponding to the blades to adjust the size of the aperture.

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

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

[0011] The driving mechanism further comprises a rotatable transmission gear, the rotation axis of the transmission gear extending in the front-rear direction, and the second driving gear meshes with the first driving gear through the transmission gear;

[0012] Wherein, the first driving gear, the transmission gear and the second driving gear are arranged in sequence along the left and right directions.

[0013] In one embodiment, a mounting groove is concavely formed on the front side of the aperture holder, and the through hole is penetrated through the bottom of the mounting groove;

[0014] The plurality of blades and the first driving gear are both arranged in the installation groove, and the first driving gear is arranged on a side of the plurality of blades away from the groove bottom of the installation groove.

[0015] In one embodiment, an arc-shaped limiting groove is concavely formed at the bottom of the mounting groove, and the limiting groove extends along the circumference of the aperture seat;

[0016] A limiting block is convexly provided on the rear end surface of the first driving gear. The limiting block is clamped in the limiting groove and can rotate along the circumference of the aperture seat in the limiting groove to limit the rotation angle of the first driving gear.

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

[0018] A connecting shaft extending in the front-rear direction is arranged on the side of the connecting end of each blade facing the aperture seat, and each connecting shaft is rotatably installed in a corresponding connecting hole. The driving shaft is arranged on the side of the driving end of each blade facing the first driving gear.

[0019] In one embodiment, the base is extended in the left-right direction, and a communication hole is provided corresponding to the through hole, and the communication hole is used for light passing through the through hole;

[0020] The aperture seat and the driving mechanism are arranged 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 piece, which is arranged on the outer peripheral wall of the aperture seat and extends in the left and right directions. A positioning block is convexly provided on the rear end surface of the positioning piece, and the positioning block is clamped in the positioning hole.

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

[0024] The present invention further provides a projection lens, the projection lens comprising the above-mentioned aperture structure, the aperture structure comprising:

[0025] An aperture seat, wherein a through hole is formed in the middle of the aperture seat in the front-to-back direction;

[0026] A plurality of blades, each of which is arranged in an arc shape to have a connecting end and a driving end which are arranged opposite to each other in the arc length direction, the plurality of blades are arranged at intervals along the circumference of the aperture seat, and the connecting end of each blade is rotatably mounted on the aperture seat around a rotation axis extending forward and backward, the driving ends of the plurality of blades can at least partially cover the through hole during the swinging process, the plurality of blades together enclose an aperture opening, and the diameter of the aperture opening is adjustable; and,

[0027] The driving mechanism includes a first driving gear rotatably arranged 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 arranged in front-to-back upward alignment with the aperture, and the peripheral side surface of the first driving gear is provided with a plurality of driving grooves arranged at intervals, and the plurality of driving grooves are used for rotational connection of the driving ends of the 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 corresponding to the blades to adjust the size of the aperture.

[0028] In the technical solution provided by the present invention, the driving end of the blade is adjusted to rotate around the connecting end of the blade, and the connecting end and the driving end of each blade are arranged on both sides of the through hole in the radial direction, so that when the aperture size is adjusted, the driving stroke for driving the first driving gear to rotate can be longer, so that when the first driving gear is driven to rotate by the gear, the transmission structure does not need to set a multi-stage transmission structure. In addition, the aperture seat and each blade have a simple structure and can be directly stamped and formed, which greatly reduces the cost of the all-metal aperture to solve the problems of high material cost and large external size of the existing aperture. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1An exploded schematic diagram of an embodiment of an aperture structure provided by the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the rear side structure of the aperture structure.

[0032] Description of Figure 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 piece; 71. Positioning block; 8. Cover plate.

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications 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.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. 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 invention.

[0038] With the continuous development of projection technology and the expansion of application scenarios, the market size is also growing. In this context, the update and iteration of focal projection lenses are also 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 and improve the contrast and brightness of the projected image. However, the brightness of the light source of the projection lens is also constantly increasing, resulting in the need for an all-metal structure for the aperture inside the lens to avoid burns and damage. Existing all-metal apertures are often machined or die-cast and then machined, resulting in high aperture costs, which leads to a significant increase in the cost of the entire projector.

[0039] In order to solve the above problems, the present invention provides an aperture structure 100 .

[0040] See also Figure 1 to Figure 2 The aperture structure 100 includes an aperture seat 1, a plurality of blades 2 and a driving mechanism. A through hole 11 is formed in the middle of the aperture seat 1 along the front-to-back direction. Each blade 2 is arranged in an arc shape, so as to have a connecting end 21 and a driving end 22 which are arranged opposite to each other in the arc length direction. The plurality of blades 2 are arranged at intervals along the circumference of the aperture seat 1, and the connecting end 21 of each blade 2 is rotatably mounted on the aperture seat 1 around a rotation axis extending forward and backward. The driving ends 22 of the plurality of blades 2 can at least partially cover the through hole 11 during the swinging process. The plurality of blades 2 are enclosed together to form an aperture opening, and the The diameter of the aperture opening is adjustable; the driving mechanism includes a first driving gear 3 rotatably arranged relative to the aperture seat 1, the first driving gear 3 is arranged in a ring shape, and the inner hole of the first driving gear 3 is arranged in front-to-back upward alignment with the aperture opening, and the peripheral side surface of the first driving gear 3 is provided with a plurality of driving grooves 31 arranged at intervals, and 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 corresponding to the blades 2 to adjust the size of the aperture opening.

[0041] The rotation of the first driving gear 3 may be realized manually or electrically. During manual adjustment, an operating member coaxially arranged with the driving gear may be provided, and the user controls the rotation of the first driving gear 3 by operating the operating member.

[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 arranged on both sides of the through hole 11 in the radial direction, so that when the aperture size is adjusted, the driving stroke for driving the first driving gear 3 to rotate can be longer, so that when the first driving gear 33 is driven to rotate by the gear, the transmission structure does not need to be provided with a multi-stage transmission structure, thereby reducing the overall size and reducing the material cost.

[0043] In addition, it is understandable that as the brightness of the light source continues to increase, the internal aperture of the lens needs to use an all-metal structure to avoid burns and damage, and the all-metal structure has a high processing cost. For this reason, in one embodiment of the present invention, the aperture seat 1 and each of the blades 2 have a simple structure and can be directly stamped into shape, 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 the present invention, the driving end 22 of the blade 2 is adjusted to rotate around the connecting end 21 of the blade 2, and the connecting end 21 and the driving end 22 of each blade 2 are arranged on both sides of the through hole 11 in its radial direction, so that when the aperture size is adjusted, the driving stroke for driving the first driving gear 3 to rotate can be longer, so that when the first driving gear 3 is driven to rotate by the gear, the transmission structure does not need to set a multi-stage transmission structure. In addition, the aperture seat 1 and each blade 2 have a simple structure and can be directly stamped and formed, which greatly reduces the cost of the all-metal aperture to solve the problems of high material cost and large external dimensions of the existing aperture.

[0045] In one embodiment of the present invention, the driving mechanism further includes a driving motor 4, the driving motor 4 has an output shaft 41 extending in the front-rear direction, the output shaft 41 is provided with a second driving gear 42, and the second driving gear 42 is meshed with the first transmission gear 5. In this way, the meshing between the gears provides a physical locking effect to prevent the aperture blades 2 from accidentally moving due to vibration or other external forces; wherein, the driving motor 4 can be a stepping motor or a servo motor, etc., and the use of the driving motor 4 can realize the 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 applied to the gears is relatively large. In order to avoid gear damage and increase service life, in one embodiment of the present invention, the drive mechanism also includes a rotatable transmission gear 5, and the rotation axis of the transmission gear 5 extends in the front and rear directions, and the transmission gear 5 is meshed with the first drive gear 3.

[0047] In addition, in order to enable the drive motor 4 to more accurately adjust the aperture size, the drive mechanism may further include a position measuring device and a control device, wherein the position measuring device is used to detect the relative position of the first drive gear 3 relative to the aperture, and 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, when the aperture rotates, a device capable of measuring the rotation angle of the first drive gear 3 is required.

[0048] It can be understood that in order to measure the rotation angle of the first driving gear 3, it is necessary to use the position state of the first driving gear 3 as a reference position for measurement when the first driving gear 3 is in a certain specific position. By driving the first driving gear 3 to the reference position as a benchmark, the corresponding relationship between the required aperture size and the driving angle can be obtained. The control device can control the driving motor 4 to rotate to an appropriate angle according to the difference between the target angle and the real-time angle to achieve the target aperture value.

[0049] In one embodiment of the present invention, the front side surface of the aperture seat 1 is concavely provided with a mounting groove 12, and the bottom of the mounting groove 12 is penetrated with the through hole 11; the plurality of blades 2 and the first driving gear 3 are both arranged in the mounting groove 12, and the first driving gear 3 is arranged on the side of the plurality of blades 2 away from the bottom of the mounting groove 12. In this way, the aperture seat 1 can be regarded as a mounting component for the plurality of blades 2 and the driving mechanism, and the bottom wall and side wall of the mounting groove 12 surround the plurality of blades 2 and the first driving gear 3 to form a protective shell.

[0050] Further, it can be understood that, in one embodiment of the present invention, the bottom of the mounting groove 12 is concavely provided with an arc-shaped limit groove 14, and the limit groove extends along the circumference of the aperture seat 1; the rear end surface of the first driving gear 3 is convexly provided with a limit block 32, and the limit block 32 is clamped in the limit groove and can rotate in the limit groove along the circumference of the aperture seat 1 to limit the rotation angle of the first driving gear 3; by limiting the extension length of the arc-shaped limit groove 14, the moving distance of the limit block 32 in the arc-shaped limit groove 14 is limited, and the rotation angle of the first driving gear 3 is limited, thereby controlling the opening and closing range of the aperture port. In this way, the limit structure in the prior art is simplified, and the arc-shaped limit groove 14 is provided in the circumference of the aperture seat 1, and does not occupy additional space, thereby reducing the overall size.

[0051] Specifically, in one embodiment of the present invention, the bottom of the mounting groove 12 is provided with a plurality of connection holes 13, and the plurality of connection holes 13 are arranged at intervals along the circumference of the aperture seat 1; a connection shaft 24 extending in the front-back direction is provided on the side of the connection end 21 of each blade 2 facing the aperture seat 1, and each connection shaft 24 is rotatably mounted on a corresponding connection hole 13, and a drive shaft 23 is provided on the side of the drive end 22 of each blade 2 facing the first drive gear 3. It can be understood that, in order to realize the rotation of the blade 2, a positioning column can be protruded on the bottom of the mounting groove 12, and a plug hole is provided through the connection end 21 of each blade 2, and the plug hole of the blade 2 is inserted into the positioning column.

[0052] In one embodiment of the present invention, the base 6 is extended in the left-right direction, and a connecting hole 61 is provided corresponding to the through hole 11, and the connecting hole 61 is used to transmit the light through the through hole 11; the aperture seat 1 and the driving mechanism are arranged on the base 6, so as to receive and fix the aperture seat 1 and the driving mechanism.

[0053] Further, it can be understood that, during the rotation process, the first driving gear 3 will inevitably drive the aperture seat 1 to rotate, resulting in a decrease in the aperture accuracy. For this reason, in one embodiment of the present invention, a positioning hole 62 is opened on the left side of the base 6; the aperture structure 100 also includes a positioning member 7, which is arranged on the outer peripheral wall of the aperture seat 1 and extends in the left and right directions. A positioning block 71 is convexly provided on the rear end surface of the positioning member 7, and the positioning block 71 is clamped in the positioning hole 62; in this way, the positioning block 71 is clamped in the positioning hole 62, thereby limiting the aperture seat 1 from being driven to rotate by the first driving gear 3, thereby improving the aperture accuracy.

[0054] In one embodiment of the present invention, the aperture structure 100 also includes a cover plate 8, which covers the aperture seat 1, multiple blades 2 and the driving mechanism. Through such a configuration, the cover plate 8 protects the aperture seat 1, multiple blades 2 and the driving mechanism to prevent them from external damage, thereby improving the life of the aperture structure 100.

[0055] In addition, in one embodiment of the present invention, the bottom plate, the positioning member 7, and the cover plate 8 can also be formed by stamping, thereby realizing stamping of the main parts and reducing the processing cost. And the positioning hole 62 on the left side of the base 6 can also be used as a stamping positioning hole 62 during stamping, ensuring the aperture accuracy at a low cost.

[0056] The present invention further provides a projection lens, which includes the above-mentioned aperture structure, and further includes other components such as lenses and diaphragms. Since the projection lens includes the aperture structure, the specific structure of the aperture structure refers to the above-mentioned embodiment. Since the aperture structure of the projection lens adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0057] 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. An aperture structure, characterized in that: include: An aperture seat, wherein a through hole is formed in the middle of the aperture seat in the front-to-back direction; A plurality of blades, each of which is arranged in an arc shape to have a connecting end and a driving end which are arranged opposite to each other in the direction of the arc length thereof, the connecting end and the driving end of each of the blades being arranged on both sides of the through hole in the radial direction thereof, the plurality of blades being arranged at intervals along the circumference of the aperture seat, and the connecting end of each of the blades being rotatably mounted on the aperture seat around a rotation axis extending forward and backward, the driving ends of the plurality of blades being able to at least partially cover the through hole during the swinging process, the plurality of blades jointly enclosing an aperture opening, and the diameter of the aperture opening being adjustable; as well as, The driving mechanism includes a first driving gear rotatably arranged 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 arranged in front-to-back upward alignment with the aperture, and the peripheral side surface of the first driving gear is provided with a plurality of driving grooves arranged at intervals, and the plurality of driving grooves are used for rotational connection of the driving ends of the 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 corresponding to the blades to adjust the size of the aperture.

2. The aperture structure according to claim 1, characterized in that: The driving mechanism further comprises a driving motor, wherein the driving motor has an output shaft extending in a front-rear direction, and a second driving gear is arranged on the output shaft, and the second driving gear is meshed with the first transmission gear.

3. The aperture structure according to claim 1, characterized in that: The driving mechanism further comprises a driving motor, wherein the driving motor has an output shaft extending in a front-rear direction, and a second driving gear is arranged on the output shaft; The driving mechanism further comprises a rotatable transmission gear, the rotation axis of the transmission gear extends in the front-rear direction, and the second driving gear is meshed with the first driving gear through the transmission gear; Wherein, the first driving gear, the transmission gear and the second driving gear are arranged in sequence along the left and right directions.

4. The aperture structure according to claim 1, characterized in that: The front side surface of the aperture seat is concavely provided with a mounting groove, and the bottom of the mounting groove is penetrated by the through hole; The plurality of blades and the first driving gear are both arranged in the installation groove, and the first driving gear is arranged on a side of the plurality of blades away from the groove bottom of the installation groove.

5. The aperture structure according to claim 4, characterized in that: An arc-shaped limiting groove is concavely formed at the bottom of the mounting groove, and the limiting groove extends along the circumference of the aperture seat; A limiting block is convexly provided on the rear end surface of the first driving gear. The limiting block is clamped in the limiting groove and can rotate along the circumferential direction of the aperture seat in the limiting groove to limit the rotation angle of the first driving gear.

6. The aperture structure according to claim 4, characterized in that: A plurality of connection holes are concavely formed at the bottom of the mounting groove, and the plurality of connection holes are arranged at intervals along the circumference of the aperture seat; A connecting shaft extending in the front-rear direction is arranged on the side of the connecting end of each blade facing the aperture seat, and each connecting shaft is rotatably installed in a corresponding connecting hole. The driving shaft is arranged on the side of the driving end of each blade facing the first driving gear.

7. The aperture structure according to claim 1, characterized in that: The base is extended in the left and right directions, and a communication hole is provided corresponding to the through hole, and the communication hole is used for light passing through the through hole; The aperture seat and the driving mechanism are arranged on the base.

8. The aperture structure according to claim 7, characterized in that: A positioning hole is provided on the left side of the base; The aperture structure also includes a positioning piece, which is arranged on the outer peripheral wall of the aperture seat and extends in the left and right directions. A positioning block is convexly provided on the rear end surface of the positioning piece, and the positioning block is clamped in the positioning hole.

9. The aperture structure according to claim 1, characterized in that: The aperture structure also includes a cover plate, which covers the aperture seat, multiple blades and the driving mechanism.

10. A projection lens, characterized in that: Comprising the aperture structure as described in any one of claims 1 to 9.

Images