A lens cover device

Abstract

This invention discloses a lens cover device, including a light-shielding cover, a fixing ring, a driving ring, and a blade assembly. The light-shielding cover has a light-transmitting window. The fixing ring is coaxially fixed to the light-shielding cover. The driving ring is located on one side of the light-shielding cover and is rotatably arranged around the axial direction of the light-transmitting window. The driving ring has a driving groove. The blade assembly includes multiple sets of blades. One side of the blade set facing the driving ring has a driving pin extending into the driving groove, and the other side has a positioning pin extending into the positioning hole of the light-shielding cover. When the driving ring rotates axially around the light-transmitting window, the driving groove and the driving pin drive the blade sets to rotate axially around the positioning pin. Under the drive of the driving ring, the multiple sets of blades have a closed state (closing the light-transmitting window) and an open state (opening the light-transmitting window). The lens cover device also adopts a structure in which the rotating driving ring drives the blade assembly to open and close, which has the advantages of simple transmission structure, smooth opening and closing of the blade assembly, less prone to jamming, high transmission reliability, and superior user experience.

Description

Technical Field

[0001] This invention relates to the field of camera lens technology, and more specifically to a lens cap device. Background Technology

[0002] A lens cap is a protective cover installed on the front of a camera lens to prevent dust from getting into the lens's optical elements. Most lens caps on the market today are detachable. When the lens cap needs to protect the optical elements in front of the lens, it is clipped onto the front of the lens; when it is not needed to protect the optical elements or when the lens needs to be used for taking pictures, the lens cap is removed. This type of detachable lens cap is easy to lose.

[0003] To address the issue of detachable lens caps being easily lost, some lens caps are designed with multiple openable blades. These blades are driven to open and close via a press-type spring linkage structure, allowing the viewing window on the lens cap to be opened and closed. This eliminates the need to repeatedly remove and reinstall the lens cap, thus solving the problem of detachable lens caps being easily lost.

[0004] However, this type of lens cover, which uses a press-type spring linkage structure to drive multiple blades to close and open, is prone to problems such as pressing stuck, wear, and button breakage during operation. In addition, the press switch is designed on the edge of the lens cover, which is rather abrupt and affects the user experience. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a lens cover device to solve the problems of existing blade-type lens covers that are prone to jamming during operation, wear, button breakage, abrupt button press, and affecting the user experience.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A lens cap device, comprising: A light-transmitting cover with a centrally located light-transmitting window; A retaining ring is coaxially and fixedly connected to the light-shielding cover, and the retaining ring is used to connect to the lens; A drive ring is located on the side of the light-shielding cover facing the fixed ring and is rotatably arranged around the axis of the light-transmitting window; the drive ring is provided with at least two drive grooves; from one end of the drive groove to the other end, the distance of the drive groove from the central axis of the light-transmitting window gradually increases; The blade assembly includes multiple sets of blades connected between the drive ring and the light-shielding cover, the multiple sets of blades being arranged circumferentially around the light-transmitting window; each blade set has a drive pin on the side facing the drive ring, the drive pin extending into a corresponding drive groove; each blade set has a positioning pin on the side facing the light-shielding cover, the light-shielding cover has a positioning hole on the side facing the blade assembly, the positioning pin extending into the positioning hole; When the drive rotates axially around the light-transmitting window, the blade assembly is driven to rotate axially around the positioning pin via the drive groove and the positioning pin; the multiple blade assemblies, driven by the drive ring, have a closed state where the light-transmitting window is completely closed, and an open state where the light-transmitting window is completely opened.

[0007] Furthermore, the drive ring comprises an outer ring body and an inner ring body, which are integral structures. The outer ring body is located between the light-shielding cover and the fixing ring, and is sleeved on the outer periphery of the fixing ring. The inner ring body is located inside the outer ring body, and the inner hole of the inner ring body is coaxially arranged with the light-transmitting window of the light-shielding cover. At least two drive grooves are arranged in the inner ring body, and the blade assembly is located between the inner ring body and the light-shielding cover.

[0008] Furthermore, each group of blades includes at least a first layer of blades and a second layer of blades stacked on top of each other. The first layer of blades is located between the second layer of blades and the inner ring body, and the first layer of blades and the second layer of blades are tractively connected. The drive pin is disposed on the side of the first layer of blades facing the inner ring body. The positioning pin includes a first positioning pin and a second positioning pin. The first positioning pin is disposed on the side of the first layer of blades facing the light-shielding cover, and the second positioning pin is disposed on the side of the second layer of blades facing the light-shielding cover. The positioning hole includes a first positioning hole and a second positioning hole disposed on the light-shielding cover. The first positioning pin extends into the first positioning hole, and the second positioning pin extends into the second positioning hole. When the drive ring rotates, it drives the first layer of blades to rotate axially around the first positioning pin through the drive groove and the drive pin. When the first layer of blades rotates, it drives the second layer of blades to rotate axially around the second positioning pin.

[0009] Furthermore, the light-transmitting window is circular. When the blade assembly rotates from the closed state to the open state, the rotation angle of the first layer of blades around the first positioning pin is greater than the rotation angle of the second layer of blades around the second positioning pin. When the blade assembly is in the closed state, the first layer of blades and the second layer of blades are stacked and completely located outside the cylindrical space where the light-transmitting window is located, so as to achieve the complete opening of the light-transmitting window. When the blade assembly is in the open state, the first layer of blades and the second layer of blades are staggered and respectively block different positions of the cylindrical space where the light-transmitting window is located, so as to achieve the complete closing of the light-transmitting window.

[0010] Furthermore, the second layer of blades is provided with a fan-shaped groove through which the first positioning pin passes, and the center of the fan-shaped groove is located on the axis of the second positioning pin; the second layer of blades is provided with a strip-shaped groove, and the distance between the strip-shaped groove and the second positioning pin gradually increases from one end of the strip-shaped groove to the other end; the first layer of blades is provided with a drive pin on one side facing the second layer of blades, and the drive pin extends into the strip-shaped groove; when the first layer of blades rotates around the axial direction of the first positioning pin, it drives the second layer of blades to rotate around the axial direction of the second positioning pin through the strip-shaped groove and the drive pin.

[0011] Furthermore, the first positioning pin and the second positioning pin are both located at the same end of the blade assembly; the distance between the transmission pin and the second positioning pin is less than the distance between the drive pin and the first positioning pin.

[0012] Furthermore, the driving groove is an arc-shaped groove.

[0013] Furthermore, the first positioning hole and the second positioning hole are arranged side by side.

[0014] Furthermore, the inner side of the first layer of blades near the axis of the light-transmitting window is provided with a stepped surface; when the two sets of blades are in the closed state, the stepped surfaces on the inner sides of the two first layer blades match each other to completely close the light-transmitting window.

[0015] Furthermore, the drive ring also includes a plurality of limiting bosses integrally connected between the outer ring body and the inner ring body. The plurality of limiting bosses are arranged at intervals along the circumference of the inner ring body. An arc-shaped through groove is formed between the outer ring body and the inner ring body, located between two adjacent limiting bosses. The outer circumferential surface of the limiting boss is an arc surface. The plurality of limiting bosses and the outer ring body enclose an annular limiting groove. The side of the light shield facing the drive ring is provided with an annular limiting ring that cooperates with the annular limiting groove. A portion of the annular limiting ring extends into the arc-shaped through groove to limit the circumferential rotation angle range of the drive ring.

[0016] Furthermore, the limiting boss includes a pair of first limiting bosses and a pair of second limiting bosses arranged alternately along the circumference of the inner ring body, and the central angle between any adjacent first limiting bosses and second limiting bosses is 90°; the inner surfaces of the first limiting bosses and second limiting bosses are arc surfaces, the portion of the first layer blade with the drive pin and the portion of the second layer blade with the transmission pin are both located inside the first limiting boss, and the portion of the first layer blade away from the first positioning pin and the portion of the second layer blade away from the second positioning pin extend to the inner side of the second limiting boss.

[0017] Furthermore, the fixing ring has a first limiting groove and a second limiting groove arranged circumferentially along the side facing the first limiting boss. The first limiting boss has a limiting component for positioning the driving ring and the fixing ring. The first limiting boss has a mounting groove with an opening facing the driving ring. The limiting component includes a limiting bead and an elastic element disposed in the mounting groove. The elastic element is used to drive the limiting bead to extend out of the mounting groove and into the first limiting groove or the second limiting groove. When the limiting bead is located in the first limiting groove, the blade assembly is positioned in the blade closed state. When the limiting bead is located in the second limiting groove, the blade assembly is positioned in the blade open state.

[0018] Furthermore, the fixing ring is provided with an arc-shaped groove extending circumferentially along the fixing ring, and a notch is provided on one side wall of the arc-shaped groove facing the light-shielding cover. The light-shielding cover is provided with an arc-shaped buckle extending circumferentially along the light-shielding cover. After the arc-shaped buckle extends into the arc-shaped groove from the notch, the light-shielding cover rotates circumferentially, and the arc-shaped buckle engages in the arc-shaped groove to achieve axial positioning of the light-shielding cover and the fixing ring.

[0019] Furthermore, the light-shielding cover is provided with a plurality of first screw holes, and the fixing ring is provided with a plurality of second screw holes corresponding to the positions of the first screw holes. The light-shielding cover and the fixing ring are fixedly connected by screws passing through the first screw holes and the second screw holes.

[0020] Furthermore, the outer periphery of the outer ring body is provided with a knurled structure to facilitate the rotation of the drive ring.

[0021] Furthermore, the inner side of the fixing ring is provided with a bayonet structure for engaging with the lens.

[0022] The technical solution of this invention has the following advantages: 1. The lens cap device provided by the present invention comprises a drive ring rotatable about the axis of a light-transmitting window, disposed between a light-shielding cover and a fixing ring. The drive ring has at least two drive grooves. A blade assembly consisting of multiple sets of blades is disposed between the drive ring and the light-shielding cover. A drive pin extending into the drive groove is disposed on the side of the blade assembly facing the drive ring. A positioning pin is positioned and engaged with a positioning hole on the light-shielding cover on the side of the blade assembly facing the light-shielding cover. In use, the fixing ring is connected to the lens. When the optical lens in front of the lens requires lens cap protection, the drive ring is rotated. The drive ring drives the blade assembly to rotate about the axis of the positioning pin via the drive grooves and positioning pins. Under the drive of the drive ring, the multiple sets of blades rotate to the closed state, closing the light-transmitting window. When the optical lens in front of the lens does not require protection or needs to be used for taking pictures, the drive ring is rotated in the opposite direction. Under the drive of the drive ring, the multiple sets of blades rotate to the open state, opening the light-transmitting window. This lens cap device eliminates the need for repeated disassembly of the lens cap during use, solving the problem of easy loss of detachable lens caps. Furthermore, it employs a rotary drive ring to drive the blade assembly for opening and closing, resulting in a simple transmission structure, smooth and reliable blade assembly opening and closing, and high transmission reliability. Additionally, the absence of a protruding push switch on the outer circumference of the drive ring enhances the user experience.

[0023] 2. The lens cover device provided by the present invention includes a blade assembly comprising at least a first layer of blades and a second layer of blades stacked on top of each other and connected in a transmission manner. Since the first layer of blades is positioned and connected to the first positioning hole of the light-shielding cover by a first positioning pin, when the drive ring rotates, the drive ring drives the first layer of blades to rotate axially around the first positioning pin through the drive groove and the drive pin. Since the second layer of blades is positioned and connected to the second positioning hole of the light-shielding cover by a second positioning pin, when the first layer of blades rotates, the first layer of blades drives the second layer of blades to rotate axially around the second positioning pin, thereby realizing the synchronous rotation of the first layer of blades and the second layer of blades.

[0024] 3. The lens cover device provided by the present invention comprises a drive pin, a first positioning pin, and a transmission pin on the first layer of blades, and a second positioning pin, a fan-shaped groove, and a strip-shaped groove on the second layer of blades. When the drive ring is manipulated to rotate axially around the light-transmitting window, the first layer of blades is driven to rotate axially around the first positioning pin via the drive groove and drive pin; this is a first-level linkage. When the first layer of blades rotates axially around the first positioning pin, the second layer of blades is driven to rotate axially around the second positioning pin via the strip-shaped groove and transmission pin; this is a second-level linkage. Compared with the single-level linkage of a single-layer blade, this two-level linkage transmission method of the blade assembly is beneficial to improving the smoothness of the opening and closing of the blade assembly, reducing blade jamming, and improving the user experience. Moreover, this two-level linkage blade assembly can reduce the assembly tolerance requirements between various parts, significantly reducing the assembly difficulty.

[0025] 4. The lens cap device provided by this invention, through reasonable design of the rotation angle of the first and second layer blades from the closed state to the open state, allows for a reduction in space occupation by the stacked arrangement of the first and second layer blades when the blade assembly is in the closed state. When the blade assembly is in the open state, the first and second layer blades are staggered after rotating at different angles, collectively blocking the cylindrical space occupied by the entire circular light-transmitting window. Compared with existing lens caps that only have a single layer of opening and closing blades, this invention, with a fixed lens cap size, allows for a smaller space occupation by the blade assembly in the closed state and a circular blocking area in the open state. This enables the light-transmitting window inside the lens cap to be designed as a larger circle, ensuring that the lens's field of view and light transmission are not significantly affected after the lens is connected to the lens cap device. This overcomes the technical problem of existing fixed-blade opening and closing lens caps causing vignetting at the edges of captured images and affecting shooting results.

[0026] 5. Compared with the existing technology where the light-transmitting window is designed as a square hole, the lens cover device provided by this invention requires less space for the two sets of blades. When the blades are closed, it is not necessary for the four sides of the blades to be parallel to the four sides of the square light-transmitting window, which can reduce the installation accuracy requirements of the two sets of blades, adapt to more types of lenses, and have stronger versatility. There is no need to worry about the vignetting problem caused by the assembly accuracy error of the blades, and the blades can maintain a high repeatability accuracy after multiple opening and closing.

[0027] 6. The lens cover device provided by the present invention sets the drive groove on the drive ring as an arc groove, which can improve the smoothness of the drive pin sliding in the drive groove and reduce jamming.

[0028] 7. The lens cover device provided by the present invention, with the setting of a pair of inner stepped surfaces of the first layer blades, can better achieve complete closure of the light-transmitting window.

[0029] 8. The lens cover device provided by the present invention, wherein the annular limiting groove on the drive ring and the annular limiting ring on the light shield can restrict the drive ring from rotating circumferentially relative to the light shield; a portion of the annular limiting ring extends into the arc-shaped through groove between two adjacent limiting protrusions on the drive ring, thereby restricting the range of circumferential rotation angle of the drive ring.

[0030] 9. The lens cover device provided by the present invention has the portion of the first layer blade with a drive pin and the portion of the second layer blade with a transmission pin located inside the first limiting boss. The portion of the first layer blade away from the first positioning pin and the portion of the second layer blade away from the second positioning pin extend to the inner side of the second limiting boss. This allows for full utilization of the space in the circumferential direction of the inner ring body to set the first layer blade and the second layer blade with appropriate size and shape, making it easy for the blade assembly to completely close the light-transmitting window when the blades are closed.

[0031] 10. The lens cover device provided by the present invention, when the limiting bead on the first limiting protrusion is located in the first limiting groove, the blade assembly is positioned in the blade closed state, and when the limiting bead on the first limiting protrusion is located in the second limiting groove, the blade assembly is positioned in the blade open state. The limiting assembly can prevent the blade assembly from being displaced due to vibration after opening or closing, thereby improving stability.

[0032] 11. The lens cover device provided by the present invention connects the fixing ring and the light shield by means of a rotating fastening connection between the arc-shaped groove and the arc-shaped buckle, thereby achieving an axial limiting connection between the two.

[0033] 12. The lens cover device provided by the present invention uses screws to fix the fixing ring and the light shield, which can improve the overall rigidity of the lens cover device.

[0034] 13. The lens cap device provided by the present invention has a knurled structure on the outer periphery of the outer ring, which facilitates manual operation of the drive ring rotation; and a bayonet structure on the inner side of the fixing ring, which facilitates the locking and engagement of the fixing ring and the lens. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a three-dimensional structural diagram of the lens cover device in an embodiment of the present invention; Figure 2 This is an exploded view of the lens cover device in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the blade assembly of the lens cover device in the closed state in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the blade assembly of the lens cover device in the blade open state in an embodiment of the present invention; Figure 5 This is a schematic diagram of the connection structure between the blade assembly and the light-shielding cover in an embodiment of the present invention, wherein the blade assembly is in the closed state. Figure 6 This is a schematic diagram of the connection structure between the blade assembly and the drive ring in an embodiment of the present invention, wherein the blade assembly is in the blade open state; Figure 7 This is a schematic diagram of the structure of the light-shielding cover in an embodiment of the present invention; Figure 8This is a schematic diagram of the structure of the fixing ring in an embodiment of the present invention; Figure 9 This is a schematic diagram of the drive ring structure in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the first side of the blade assembly in an embodiment of the present invention; Figure 11 This is a schematic diagram of the second side of the blade assembly in an embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of the first layer of blades in an embodiment of the present invention; Figure 13 This is a schematic diagram of the structure of the second layer of blades in an embodiment of the present invention; Figure 14 This is a cross-sectional view of the lens cover device in an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures: 100. Light-shielding cover; 100a. Light-transmitting window; 101. First positioning hole; 102. Second positioning hole; 103. First screw hole; 110. Annular limiting ring; 120. Limiting protrusion; 130. Arc-shaped buckle; 140. Arc-shaped limiting rib; 150. Arc-shaped guide groove; 200, retaining ring; 201, second screw hole; 210, first limiting groove; 220, second limiting groove; 230, arc-shaped slot; 231, notch; 240, bayonet structure; 300, Drive ring; 310, Outer ring body; 311, Knurled structure; 320, Inner ring body; 321, Drive groove; 330, First limiting boss; 331, Mounting groove; 340, Second limiting boss; 350, Arc-shaped through groove; 360, Annular limiting groove; 400, Blade assembly; 410, First layer blade; 411, Drive pin; 412, First locating pin; 413, Transmission pin; 414, Stepped surface; 420, Second layer blade; 421, Second locating pin; 422, Sector groove; 423, Strip groove; 510. Limiting bead; 520. Elastic component; 600. Screws; 700, Patch panel. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] like Figures 1 to 4 The lens cap assembly shown includes a light-shielding cover 100, a retaining ring 200, a driving ring 300, and a blade assembly 400, all coaxially arranged. The light-shielding cover 100 has a centrally located, circular light-transmitting window 100a. The retaining ring 200 is coaxially fixed to the light-shielding cover 100 by a pair of screws 600 and is used to connect to the lens. The driving ring 300 is located on the side of the light-shielding cover 100 facing the retaining ring 200 and is rotatable about the axial direction of the light-transmitting window 100a. The blade assembly 400 includes two sets of blades connected between the driving ring 300 and the light-shielding cover 100, the two sets of blades being evenly spaced around the circumference of the light-transmitting window 100a. A patch 700 is attached to the side of the driving ring 300 facing the retaining ring 200. When the drive ring 300 rotates circumferentially along the light-transmitting window 100a, it drives two sets of blades to rotate, closing and opening the light-transmitting window 100a during the rotation of the two sets of blades. It should be understood that the number of blade sets included in the blade assembly 400 is not limited to two; it can also include three or more sets, as long as the multiple sets of blades, when rotated under the drive of the drive ring 300, can close and open the light-transmitting window 100a.

[0043] like Figure 3 and Figure 4As shown, in some embodiments, the blade assembly 400, driven by the drive ring 300, has a closed state where the light-transmitting window 100a is completely closed and an open state where the light-transmitting window 100a is completely open. When the blade assembly 400 is in the open state, both sets of blades are completely outside the cylindrical space where the light-transmitting window 100a is located; when the blade assembly 400 is in the closed state, both sets of blades completely close the light-transmitting window 100a. In alternative embodiments, the blade assembly 400 can also partially close the light-transmitting window 100a in the closed state; the blade assembly 400 can also be partially located within the cylindrical space where the light-transmitting window 100a is located in the open state, as long as the blade assembly 400 does not affect the amount of light entering the optical lens within the lens in the open state.

[0044] like Figure 2 , Figure 5 and Figure 6 As shown, in some embodiments, each blade group includes a first layer of blades 410 and a second layer of blades 420 stacked on top of each other. The first layer of blades 410 is located between the second layer of blades 420 and the drive ring 300, and the first layer of blades 410 and the second layer of blades 420 are convexly connected. When the drive ring 300 rotates around its own axis, it drives the first layer of blades 410 to rotate, and when the first layer of blades 410 rotates, it drives the second layer of blades 420 to rotate, thereby realizing the complete opening and closing of the light-transmitting window 100a. In an alternative embodiment, each blade group also includes three layers of opening and closing blades stacked on top of each other. Adjacent layers of opening and closing blades are convexly connected. When the three layers of opening and closing blades are rotated and unfolded, the light-transmitting window 100a is completely closed, and when the three layers of opening and closing blades are stacked and retracted, the light-transmitting window 100a is completely open.

[0045] like Figure 2 and Figure 7 As shown, in some embodiments, the light-shielding cover 100 has a pair of first positioning holes 101 and a pair of second positioning holes 102 on the side facing the blade assembly 400, with each first positioning hole 101 and each second positioning hole 102 arranged adjacent to each other. The light-shielding cover 100 has a protruding annular limiting ring 110 on the side facing the drive ring 300, the annular limiting ring 110 being arranged in a circle around the circumference of the light-transmitting window 100a, and the annular limiting ring 110 being used to constrain the drive ring 300 to rotate circumferentially around the light-transmitting window 100a.

[0046] like Figure 2 and Figure 7As shown, in some embodiments, a pair of limiting protrusions 120 with a height higher than other parts are integrally formed on the annular limiting ring 110, and the central angle between the pair of limiting protrusions 120 is 180°. A portion of the limiting protrusions 120 extends into the inner space of the annular limiting ring 110, and each of the portions of the pair of limiting protrusions 120 extending into the inner space is provided with a first screw hole 103. The end faces of the pair of limiting protrusions 120 abut against the end faces of the fixing ring 200. Figure 8 As shown, the retaining ring 200 has a pair of second screw holes 201. The pair of second screw holes 201 on the retaining ring 200 and the pair of first screw holes 103 on the light-shield cover 100 are positioned correspondingly. The light-shield cover 100 and the retaining ring 200 are fixedly connected by screws 600 passing through the first screw holes 103 and the second screw holes 201. The method of fixing the light-shield cover 100 and the retaining ring 200 together with screws 600 can improve the overall rigidity of the lens cover assembly.

[0047] like Figure 5 and Figure 7 As shown, in some embodiments, a pair of arc-shaped buckles 130 are integrally formed on the annular limiting ring 110. The arc-shaped buckles 130 extend circumferentially along the light-shielding cover 100, and the central angle between the pair of arc-shaped buckles 130 is 180°. The central angle between any adjacent limiting protrusion 120 and the arc-shaped buckle 130 is 90°. Figure 8 As shown, the fixing ring 200 is provided with a pair of arc-shaped slots 230 extending circumferentially along the fixing ring 200. The arc-shaped slots 230 have a notch 231 on one side wall facing the light-shielding cover 100. After the arc-shaped buckle 130 extends into the corresponding arc-shaped slot 230 from the notch 231, the light-shielding cover 100 rotates circumferentially, and the arc-shaped buckle 130 can be fastened into the arc-shaped slot 230, which can realize the axial positioning and fixing of the light-shielding cover 100 and the fixing ring 200.

[0048] like Figure 2 , Figure 5 and Figure 7 As shown, in some embodiments, the side of the light-shielding cover 100 facing the drive ring 300 is provided with a reinforcing structure to enhance the structural strength of the light-shielding cover 100 itself. The reinforcing structure includes an arc-shaped limiting rib 140 located on the outer ring and forming an arc shape. An arc-shaped guide groove 150 is formed between the arc-shaped limiting rib 140 and the annular limiting ring 110, located between the limiting protrusion 120 and the arc-shaped buckle 130. A portion of the drive ring 300 extends into the arc-shaped guide groove 150, which constrains the circumferential rotation of the drive ring 300 around the light-transmitting window 100a.

[0049] like Figure 8As shown, in some embodiments, the inner side of the retaining ring 200 is provided with a pair of bayonet structures 240, which are used to engage with the lens to connect and disconnect the lens cap device from the lens. In alternative embodiments, the bayonet structures 240 can also be replaced by threaded structures.

[0050] like Figure 6 , Figure 9 and Figure 14 As shown, the drive ring 300 includes an outer ring body 310, an inner ring body 320, and four limiting bosses, all of which are integrally connected between the outer ring body 310 and the inner ring body 320. The outer ring body 310 has four circumferentially evenly arranged knurled structures 311 on its outer circumferential surface, which facilitate manual rotation of the drive ring 300. The outer ring body 310 is located in the gap between the light-shielding cover 100 and the fixing ring 200, and is fitted around the outer circumference of the fixing ring 200. The inner ring body 320 is located inside the outer ring body 310, and its inner hole is coaxially aligned with the light-transmitting window 100a of the light-shielding cover 100. Two sets of blades are located between the inner ring body 320 and the light-shielding cover 100. The inner ring body 320 is provided with two drive grooves 321 that correspond to the positions of the two sets of blades respectively. From one end of the drive groove 321 to the other end, the distance between the drive groove 321 and the central axis of the inner ring body 320 gradually increases.

[0051] like Figure 6 , Figure 7 and Figure 9 As shown, the four limiting protrusions include a pair of first limiting protrusions 330 and a pair of second limiting protrusions 340 arranged alternately along the circumference of the inner ring body 320. The central angle between any two adjacent first limiting protrusions 330 and second limiting protrusions 340 is 90°. Both the pair of first limiting protrusions 330 and the pair of second limiting protrusions 340 are arc-shaped. The four limiting protrusions and the outer ring body 310 enclose an annular limiting groove 360. The annular limiting ring 110 of the light shield 100 extends into the annular limiting groove 360 ​​of the drive ring 300 to achieve circumferential rotational limiting of the light shield 100 and the drive ring 300.

[0052] like Figure 6 , Figure 7 and Figure 9 As shown, an arc-shaped through groove 350 is formed between the outer ring body 310 and the inner ring body 320, located between the first limiting boss 330 and the second limiting boss 340. The arc-shaped through groove 350 is a hollow groove. The limiting protrusion 120 of the light shield 100 extends into the arc-shaped through groove 350. When the drive ring 300 rotates circumferentially, the first limiting boss 330 and the second limiting boss 340 of the drive ring 300 will abut against the limiting protrusion 120 of the light shield 100, limiting the range of circumferential rotation angle of the drive ring 300 relative to the light shield 100.

[0053] like Figure 6 , Figure 8 , Figure 9 and Figure 14 As shown, the fixed ring 200 has a first limiting groove 210 and a second limiting groove 220 arranged circumferentially along the side facing the first limiting boss 330. The first limiting boss 330 has a mounting groove with an opening facing the fixed ring 200. The first limiting boss 330 of the drive ring 300 has a limiting component for positioning the drive ring 300 and the fixed ring 200. The limiting component includes a limiting bead 510 disposed in the mounting groove and an elastic member 520. The elastic member 520 is used to drive the limiting bead 510 to extend out of the mounting groove and into the first limiting groove 210 or the second limiting groove 220. When the limiting bead 510 is located in the first limiting groove 210, the blade assembly 400 is positioned in the blade closed state; when the limiting bead 510 is located in the second limiting groove 220, the blade assembly 400 is positioned in the blade open state. This arrangement can prevent the blade assembly from displacing due to vibration after opening or closing, thus improving stability.

[0054] like Figure 5 , Figure 6 , Figures 10 to 13 As shown, the first layer of blades 410 has a drive pin 411 on the side facing the inner ring 320, and a first positioning pin 412 on the side facing the light shield 100. The second layer of blades 420 has a second positioning pin 421 on the side facing the light shield 100. The second layer of blades 420 has a fan-shaped groove 422 through which the first positioning pin 412 passes. The center of the fan-shaped groove 422 is located on the axis of the second positioning pin 421, and the width of the fan-shaped groove 422 matches the outer diameter of the first positioning pin 412. The first positioning pin 412 passes through the fan-shaped groove 422 and extends into the first positioning hole 101 of the light shield 100 to achieve the positioning of the first positioning pin 412. The outer diameter of the first positioning pin 412 is equal to the diameter of the first positioning hole 101. The second positioning pin 421 extends into the second positioning hole 102 of the light-shielding cover 100 to achieve the positioning of the second positioning pin 421. The outer diameter of the second positioning pin 421 is equal to the diameter of the second positioning hole 102. The second layer blade 420 is provided with a strip groove 423. From one end of the strip groove 423 to the other end, the distance between the strip groove 423 and the second positioning pin 421 gradually increases. The first layer blade 410 is provided with a drive pin 413 on the side facing the second layer blade 420. The drive pin 413 extends into the strip groove 423, and the outer diameter of the drive pin 413 matches the width of the strip groove 423.

[0055] like Figure 5 and Figure 6As shown, when the drive ring 300 rotates axially around the light-transmitting window 100a, the first layer blade 410 is positioned and connected to the first positioning hole 101 of the light-shielding cover 100 via the first positioning pin 412. The drive ring 300 drives the first layer blade 410 to rotate axially around the first positioning pin 412 via the drive groove 321 and the drive pin 411. This is the first-level linkage. When the first layer blade 410 rotates axially around the first positioning pin 412, the second layer blade 420 is positioned and connected to the second positioning hole 102 of the light-shielding cover 100 via the second positioning pin 421. The first layer blade 410 drives the second layer blade 420 to rotate axially around the second positioning pin 421 via the strip groove 423 and the transmission pin 413. This is the second-level linkage.

[0056] like Figure 10 and Figure 11 As shown, the first positioning pin 412 and the second positioning pin 421 are both located at the same end of the blade assembly. The distance between the transmission pin 413 and the second positioning pin 421 is less than the distance between the drive pin 411 and the first positioning pin 412. The first positioning pin 412 is slidably disposed along the guide direction of the fan-shaped groove 422, and the transmission pin 413 is slidably disposed along the guide direction of the strip groove 423. The length of the strip groove 423 is shorter than the length of the drive groove 321, and the maximum stroke of the drive pin 411 is greater than the maximum stroke of the transmission pin 413. When the blade assembly 400 rotates from the closed state to the open state, the rotation angle of the first layer blade 410 around the first positioning pin 412 is greater than the rotation angle of the second layer blade 420 around the second positioning pin 421. See also Figure 4 When the blade assembly 400 is in the open state, the first layer of blades 410 and the second layer of blades 420 are stacked and completely outside the cylindrical space occupied by the light-transmitting window 100a. See also Figure 3When the blade assembly 400 is in the closed state, the ends of a pair of first-layer blades 410 away from the first positioning pin 412 rotate to the center of the light-transmitting window 100a to form a central area blockage, and the ends of a pair of second-layer blades 420 away from the second positioning pin 421 rotate to the edge of the light-transmitting window 100a. The pair of second-layer blades 420 block the edge of the light-transmitting window 100a that is not blocked by the pair of first-layer blades 410, so that the blade assembly 400 can completely block the light-transmitting window 100a when the blades are closed. The first layer of blades 410 and the second layer of blades 420 are stacked together, reducing the space occupied by the blade assembly when the blades are closed. The first layer of blades 410 and the second layer of blades 420 are unfolded by rotating at different angles, allowing for a larger covering area when the blades are open. This allows the light-transmitting window 100a on the lens hood 100 to be designed as a circle without increasing the lens cap size. This solves the technical problem of existing hinged lens caps where the large size of a single hinged blade and the large space occupied by the blade when closed necessitate a square light-transmitting window design. Compared to a square light-transmitting window, the circular light-transmitting window 100a can accommodate a wider range of lens types. Furthermore, the square light-transmitting window requires the hinged blades to be aligned with the four sides of the square photosensitive chip when open, demanding high installation precision. Even slight errors in the installation position of the hinged blades can easily lead to vignetting in the image captured by the lens. In contrast, the circular light-transmitting window 100a in this application has lower installation precision requirements for the blade assembly, reducing the assembly tolerance requirements between various parts and simplifying the assembly of the lens cap device.

[0057] like Figure 5 and Figure 9 As shown, in some embodiments, the drive groove 321 is an arc-shaped groove, which can improve the smoothness of the sliding of the drive pin 411 in the drive groove 321 and reduce jamming.

[0058] like Figure 6 As shown, the portion of the first layer blade 410 with the drive pin 411 and the portion of the second layer blade 420 with the transmission pin 413 are both located inside the first limiting boss 330. The portion of the first layer blade 410 away from the first positioning pin 412 and the portion of the second layer blade 420 away from the second positioning pin 421 extend to the inner side of the second limiting boss 340. This arrangement allows for full utilization of the circumferential space of the inner ring 320 to accommodate the first layer blade 410 and the second layer blade 420 of appropriate size and shape, reducing the space occupied by the blade assembly and facilitating the design of a sufficiently large light-transmitting window 100a.

[0059] like Figure 10 and Figure 11As shown, the first layer of blades 410 has a stepped surface 414 on the inner side of the axis near the light-transmitting window 100a; when the two sets of blades are in the closed state, the stepped surfaces 414 on the inner side of the two first layer blades 410 match each other, which can better achieve the complete closure of the light-transmitting window 100a.

[0060] In use, this lens cap device connects the retaining ring 200 to the lens. When the optical lens in front of the lens needs protection, the drive ring 300 is rotated. The drive ring 300 drives a pair of first-layer blades 410 to rotate axially around the first positioning pin 412 via the drive groove 321 and the first positioning pin 412. The pair of first-layer blades 410 engage with the drive pin 413 on them and the strip groove 423 on the second-layer blades 420, driving a pair of second-layer blades 420 to rotate axially around the second positioning pin 421. This achieves the linkage control of the two layers of blades. Under the drive of the drive ring 300, the two sets of blades can rotate to the closed state of the circular light-transmitting window 100a and the open state of the circular light-transmitting window 100a. When the lens cap device is installed on the lens, it is not necessary to repeatedly disassemble the lens cap device, solving the problem of easy loss of detachable lens caps. Furthermore, the structure employing a rotary drive ring 300 to drive the opening and closing of a pair of first-layer blades 410 and a pair of second-layer blades 420, compared to a single-layer blade single-stage transmission method, improves the smoothness of the blade assembly's opening and closing, reduces blade jamming, and enhances the user experience. Moreover, this double-layer blade linkage blade assembly allows for lower requirements on the assembly tolerances between individual parts, significantly reducing assembly difficulty.

[0061] In summary, the lens cover device provided by this invention has advantages such as simple transmission structure, smooth opening and closing, less prone to jamming, high transmission reliability, no need for a protruding push switch on the outer periphery of the drive ring 300, and superior user experience. By rationally designing the rotation angle of the first layer blade 410 and the second layer blade 420 from the blade closed state to the blade open state, when the blade assembly 400 is in the blade closed state, the stacked arrangement of the first layer blade 410 and the second layer blade 420 can reduce the space occupied by the blade assembly in this state; when the blade assembly is in the blade open state, the first layer blade 410 and the second layer blade 420 are staggered after rotating at different angles, which can jointly block the cylindrical space where the entire circular light-transmitting window 100a is located. Compared to existing lens caps with only a single-layer opening and closing blade, this new lens cap, with a fixed size, occupies less space when the blades are closed and the obstructed area is circular when the blades are open. This allows for a larger circular light-transmitting window 100a inside the lens hood 100. After the lens is connected to the lens cap device, the field of view and light transmission are not significantly affected. This overcomes the technical problem of existing lens caps with fixed blades causing vignetting at the edges of captured images and affecting shooting quality. This lens cap device is also compatible with more lens models, offering greater versatility. It eliminates concerns about vignetting caused by blade assembly precision errors and maintains high repeatability after multiple opening and closing cycles.

[0062] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A lens cap device, characterized in that, include: A light-blocking cover (100) has a light-transmitting window (100a) located in the center; A retaining ring (200) is coaxially and fixedly connected to the light-shielding cover (100), and the retaining ring (200) is used to connect to the lens; A drive ring (300) is located on the side of the light-shielding cover (100) facing the fixed ring (200) and is rotatably disposed about the axis of the light-transmitting window (100a); the drive ring (300) is provided with at least two drive grooves (321); The blade assembly (400) includes multiple sets of blades connected between the drive ring (300) and the light shield (100), the multiple sets of blades being arranged circumferentially around the light-transmitting window (100a); each blade set has a drive pin (411) on the side facing the drive ring (300), the drive pin (411) extending into a corresponding drive groove (321); each blade set has a positioning pin on the side facing the light shield (100), the light shield (100) has a positioning hole on the side facing the blade assembly (400), the positioning pin extending into the positioning hole; When the drive ring (300) rotates axially around the light-transmitting window (100a), it drives the blade assembly to rotate axially around the positioning pin through the drive groove (321) and the drive pin (411); the multiple blade assemblies have a closed state (closing the light-transmitting window (100a)) and an open state (opening the light-transmitting window (100a)) under the drive of the drive ring (300).

2. The lens cap device according to claim 1, characterized in that, The drive ring (300) includes an outer ring body (310) and an inner ring body (320) that are integrally formed. The outer ring body (310) is located between the light-shielding cover (100) and the fixing ring (200), and the outer ring body (310) is sleeved on the outer periphery of the fixing ring (200). The inner ring body (320) is located inside the outer ring body (310), and the inner ring body (320) is coaxially arranged with the light-transmitting window (100a). At least two drive grooves (321) are provided in the inner ring body (320), and the blade assembly (400) is located between the inner ring body (320) and the light-shielding cover (100). From one end of the drive groove (321) to the other end, the distance between the drive groove (321) and the central axis of the inner ring body (320) gradually increases.

3. The lens cap device according to claim 2, characterized in that, Each blade group includes at least a first layer of blades (410) and a second layer of blades (420) stacked on top of each other. The first layer of blades (410) is located between the second layer of blades (420) and the inner ring body (320), and the first layer of blades (410) and the second layer of blades (420) are connected in a driving manner. The drive pin (411) is located on the side of the first layer of blades (410) facing the inner ring body (320). The positioning pin includes a first positioning pin (412) and a second positioning pin (421). The first positioning pin (412) is located on the side of the first layer blade (410) facing the light shield (100), and the second positioning pin (421) is located on the side of the second layer blade (420) facing the light shield (100); the positioning hole includes a first positioning hole (101) and a second positioning hole (102) located on the light shield (100), the first positioning pin (412) extends into the first positioning hole (101), and the second positioning pin (421) extends into the second positioning hole (102); When the drive ring (300) rotates, it drives the first layer blade (410) to rotate around the first positioning pin (412) axially through the drive groove (321) and the drive pin (411). When the first layer blade (410) rotates, it drives the second layer blade (420) to rotate around the second positioning pin (421) axially.

4. The lens cap device according to claim 3, characterized in that, The light-transmitting window (100a) is circular. When the blade assembly (400) rotates from the closed state to the open state, the rotation angle of the first layer of blades (410) around the first positioning pin (412) is greater than the rotation angle of the second layer of blades (420) around the second positioning pin (421). When the blade assembly (400) is in the closed state, the first layer of blades (410) and the second layer of blades (420) are stacked and completely located outside the cylindrical space where the light-transmitting window (100a) is located. When the blade assembly (400) is in the open state, the first layer of blades (410) and the second layer of blades (420) are staggered and respectively block different positions of the cylindrical space where the light-transmitting window (100a) is located.

5. The lens cap device according to claim 4, characterized in that, The second layer blade (420) is provided with a fan-shaped groove (422) through which the first positioning pin (412) passes, and the center of the fan-shaped groove (422) is located on the axis of the second positioning pin (421); the second layer blade (420) is provided with a strip groove (423), and the distance between the strip groove (423) and the second positioning pin (421) gradually increases from one end to the other end; the first layer blade (410) is provided with a drive pin (413) on the side facing the second layer blade (420), and the drive pin (413) extends into the strip groove (423); when the first layer blade (410) rotates around the axis of the first positioning pin (412), the second layer blade (420) is driven to rotate around the axis of the second positioning pin (421) through the strip groove (423) and the drive pin (413).

6. The lens cap device according to claim 5, characterized in that, The first positioning pin (412) and the second positioning pin (421) are both located at the same end of the blade assembly; the distance between the transmission pin (413) and the second positioning pin (421) is less than the distance between the drive pin (411) and the first positioning pin (412).

7. The lens cap device according to claim 4, characterized in that, The first layer of blades (410) has a stepped surface (414) on the inner side of the axis near the light-transmitting window (100a); when the two sets of blades are in the closed state, the stepped surfaces (414) on the inner side of the two first layer blades (410) match each other to completely close the light-transmitting window (100a).

8. The lens cap device according to claim 5, characterized in that, The drive ring (300) further includes a plurality of limiting bosses integrally connected between the outer ring body (310) and the inner ring body (320). The plurality of limiting bosses are arranged at circumferential intervals along the inner ring body (320). An arc-shaped through groove (350) is formed between the outer ring body (310) and the inner ring body (320) located between two adjacent limiting bosses. The plurality of limiting bosses and the outer ring body (310) enclose and form The light-shielding cover (100) has an annular limiting groove (360) on the side facing the drive ring (300) and an annular limiting ring (110) that cooperates with the annular limiting groove (360). The annular limiting ring (110) has a limiting protrusion (120) that extends into the arc-shaped through groove (350). The limiting protrusion (120) cooperates with the arc-shaped through groove (350) to limit the circumferential rotation angle range of the drive ring (300).

9. The lens cap device according to claim 8, characterized in that, The limiting boss includes a pair of first limiting bosses (330) and a pair of second limiting bosses (340) arranged alternately along the circumference of the inner ring body (320), and the central angle between any adjacent first limiting bosses (330) and second limiting bosses (340) is 90°; the portion of the first layer blade (410) with the drive pin (411) and the portion of the second layer blade (420) with the transmission pin (413) are both located inside the first limiting boss (330), and the portion of the first layer blade (410) away from the first positioning pin (412) and the portion of the second layer blade (420) away from the second positioning pin (421) extend to the inner side of the second limiting boss (340).

10. The lens cap device according to claim 9, characterized in that, The fixing ring (200) has a first limiting groove (210) and a second limiting groove (220) arranged circumferentially around the fixing ring (200) on the side facing the first limiting boss (330). The first limiting boss (330) has a limiting component for positioning the driving ring (300) and the fixing ring (200). The first limiting boss (330) has a mounting groove with an opening facing the driving ring (300). The limiting component includes a limiting bead (51) disposed in the mounting groove. 0) and elastic element (520), the elastic element (520) is used to drive the limiting bead (510) to extend out of the mounting groove and into the first limiting groove (210) or the second limiting groove (220); when the limiting bead (510) is located in the first limiting groove (210), the blade assembly (400) is positioned in the blade closed state, and when the limiting bead (510) is located in the second limiting groove (220), the blade assembly (400) is positioned in the blade open state.

11. The lens cap device according to claim 10, characterized in that, The fixing ring (200) is provided with an arc-shaped groove (230) extending circumferentially along the fixing ring (200). The arc-shaped groove (230) has a notch (231) on one sidewall facing the light-shielding cover (100). The light-shielding cover (100) is provided with an arc-shaped buckle (130) extending circumferentially along the light-shielding cover (100). After the arc-shaped buckle (130) extends into the arc-shaped groove (230) from the notch (231), the light-shielding cover (100) rotates circumferentially, and the arc-shaped buckle (130) engages in the arc-shaped groove (230) to achieve axial positioning of the light-shielding cover (100) and the fixing ring (200).

12. The lens cap device according to claim 10, characterized in that, The light-shielding cover (100) is provided with a plurality of first screw holes (103), and the fixing ring (200) is provided with a plurality of second screw holes (201) corresponding to the first screw holes (103) in one position. The light-shielding cover (100) and the fixing ring (200) are fixedly connected by screws (600) passing through the first screw holes (103) and the second screw holes (201).

13. The lens cap device according to claim 2, characterized in that, The outer ring (310) has a knurled structure (311) on its outer periphery to facilitate the rotation of the drive ring (300).

Images