Lens assembly, lens, and image pickup apparatus
By designing a lens assembly that includes a cladding, a conversion key and a focus ring, the problem of limited use of existing lens conversion keys is solved, and the feel feedback and layout flexibility of the focus ring when it rotates.
Patent Information
- Application Number
- CN202420506048.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-14
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-03-14
AI Technical Summary
The keycap working motion trajectory of existing lens conversion keys is single, resulting in limited use position and cannot achieve flexible layout.
Design a lens assembly, including a cover, a conversion key and a focus ring. The conversion key consists of a key cap, a sliding block and a ball structural member. The key cap brim cover member moves circumferentially, and drives the sliding block and ball structural member to move in the axial direction, realizing the transformation of the mating relationship with the focus ring.
The circumferential movement of the key cap is achieved to provide feedback on the feel of the focus ring when rotating, expanding the distribution and layout of the conversion keys and improving the flexibility of use.
Smart Images
Figure CN222672128U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of camera technology, and in particular to a lens assembly, a lens and an image pickup device. Background Art
[0002] With the development of science and technology, the design and performance of photographic equipment are also constantly improving. As the core part of photographic equipment, the convenience and accuracy of lens operation have an important impact on the photographic effect.
[0003] Lens focusing is a common method to make the subject form a clear image on the imaging surface. In order to achieve the change of hand feeling when turning the focus ring, a switch key is often provided on the lens. However, the key cap driving direction of the existing switch key is usually along the axial direction of the lens, and the working motion track of the key cap is single, which limits the use position of the switch key.
[0004] Therefore, it is necessary to improve the existing setting structure of the conversion key. Utility Model Content
[0005] The present application provides a lens assembly, a lens and an image pickup device, aiming to solve the problem in the prior art that the key cap has a single working motion trajectory, resulting in a limited use position of the conversion key.
[0006] To achieve the above objectives, the present application proposes a lens assembly. The lens assembly comprises:
[0007] A covering member, wherein a movable hole is formed through the side wall of the covering member along the circumference of the covering member;
[0008] A conversion key, comprising a keycap, a sliding block and a ball bearing structure; the sliding block is slidably arranged on the inner side of the covering member, and an oblique guide groove is provided on the sliding block; the keycap passes through the movable hole and is inserted into the oblique guide groove, and the keycap can move back and forth in the movable hole to a first position and a second position, and the movement of the keycap drives the sliding block to slide along the axial direction of the covering member; the ball bearing structure is arranged at one end of the sliding block;
[0009] A focus ring, rotatably connected to the covering member, the focus ring being provided with a toothed flange corresponding to the ball bearing structure;
[0010] Wherein, when the keycap is in the first position, the ball structure and the toothed flange remain isolated; when the keycap is in the second position and the focus ring rotates relative to the covering member, the toothed flange can rhythmically press the ball structure.
[0011] In some embodiments, the angle between the oblique guide groove and the movable hole does not exceed 90°.
[0012] In some embodiments, the keycap comprises:
[0013] A sliding portion, slidably disposed on the outer surface of the covering member, wherein the surface of the sliding portion is designed with an anti-slip structure;
[0014] The connecting part is a connecting column, one end of which passes through the movable hole and is connected to the middle position of the sliding part, and the other end is inserted into the inclined guide groove.
[0015] In some embodiments, the conversion key further comprises a mounting seat mounted on the inner side wall of the covering member, a sliding channel is formed in the middle of the mounting seat, and the sliding block is slidably disposed in the sliding channel;
[0016] A first avoidance hole is formed on one side of the mounting seat close to the side wall of the covering member and corresponds to the movable hole, and the connecting portion passes through the first avoidance hole and is inserted into the inclined guide groove.
[0017] In some embodiments, guide rails are formed on opposite side walls of the sliding channel, and grooves are formed on both sides of the sliding block corresponding to the guide rails, so that the sliding block slides along the sliding channel through the cooperation between the guide rails and the grooves.
[0018] In some embodiments, a second avoidance hole is formed on a side of the mounting seat away from the side wall of the covering member, and the connecting portion also passes through the second avoidance hole; the switching key further includes a spring sheet, and the spring sheet is installed on the mounting seat adjacent to the second avoidance hole;
[0019] Wherein, a bent portion is formed in the middle of the spring sheet corresponding to the second avoidance hole and is bent toward the second avoidance hole.
[0020] In some embodiments, a mounting seat is formed at one end of the sliding block, and a columnar accommodation chamber is formed through the mounting seat; the ball structure comprises:
[0021] A ball is placed in the columnar containing chamber;
[0022] An abutment member, disposed at one end of the columnar accommodation chamber away from the covering member, and used for blocking an opening at one end of the columnar accommodation chamber;
[0023] an elastic member, disposed between the ball and the abutment member, the elastic member being used to press the ball at the opening at the other end of the columnar accommodation chamber;
[0024] Wherein, the inner diameter of the opening at the other end of the columnar accommodation chamber is smaller than the diameter of the ball.
[0025] In some embodiments, the elastic member includes a compression spring, one end of the compression spring abuts against the ball, and the other end of the compression spring abuts against the abutting member.
[0026] The present application also provides a lens, which includes the lens assembly as described above.
[0027] The present application also provides an image pickup device, which includes a camera body and the lens as described above, wherein the camera body is detachably connected to the lens.
[0028] The technical solution of the present application proposes a lens assembly. The lens assembly includes a covering, a conversion key and a focus ring; the covering has a movable hole formed on its side wall along its circumference; the conversion key includes a keycap, a sliding block and a ball structure; the sliding block is slidably arranged on the inner side of the covering, and an oblique guide groove is provided on the sliding block; the keycap passes through the movable hole and is inserted into the oblique guide groove, and the keycap can move back and forth in the movable hole to a first position and a second position, and the keycap moves to drive the sliding block to slide along the axial direction of the covering; the ball structure is arranged at one end of the sliding block; the focus ring is rotatably connected to the covering, and a toothed flange corresponding to the ball structure is arranged on the focusing ring; wherein, when the keycap is in the first position, the ball structure is isolated from the toothed flange; when the keycap is in the second position and the focus ring rotates relative to the covering, the toothed flange can rhythmically press the ball structure. The keycaps in the technical solution of the present application are arranged along the circumference of the covering member. When the keycaps are driven to move, based on the cooperation between the keycaps and the oblique guide grooves in the sliding block, the sliding block can be abutted to move in the axial direction of the preset covering member, thereby finally realizing the transformation of the cooperation relationship between the ball structure and the focus ring. Through a simple structural design, the keycaps can also achieve the purpose of hand feedback when the focus ring rotates after moving in the circumferential direction, so as to expand the distribution layout of the conversion keys. The present application also provides a lens and an image pickup device. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:
[0030] Figure 1 The structure of the lens assembly of an embodiment of the present application is shown in FIG. Figure 1 ;
[0031] Figure 2 The structure of the lens assembly of an embodiment of the present application is shown in FIG. Figure 2 ;
[0032] Figure 3This is a schematic diagram of the assembly structure of a conversion key according to an embodiment of the present application;
[0033] Figure 4 This is a schematic diagram of the exploded structure of a conversion key according to an embodiment of the present application;
[0034] Figure 5 This is a schematic cross-sectional structural diagram of a sliding block according to an embodiment of the present application;
[0035] Figure 6 This is a schematic structural diagram of a mounting base according to an embodiment of the present application. DETAILED DESCRIPTION
[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0037] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) 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.
[0038] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.
[0039] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.
[0040] See also Figure 1-Figure 3As shown, the present application proposes a lens assembly 100. The lens assembly 100 includes a cover 10, a conversion key 20 and a focus ring (not shown in the drawings); the cover 10 has a movable hole formed on its side wall along its circumference (not shown in the drawings); the conversion key 20 includes a key cap 21, a sliding block 22 and a ball structure 23; the sliding block 22 is slidably arranged on the inner side of the cover 10, and an oblique guide groove 221 is opened on the sliding block 22; the key cap 21 passes through the movable hole and is inserted into the oblique guide groove 221, and the key cap 21 can move back and forth in the movable hole to a first position and the second position, and the key cap 21 moves to drive the sliding block 22 to slide axially along the covering part 10; the ball structure 23 is arranged at one end of the sliding block 22; the focus ring is rotatably connected to the covering part 10, and a toothed flange corresponding to the ball structure 23 is arranged on the focus ring; wherein, when the key cap 21 is in the first position, the ball structure 23 is kept isolated from the toothed flange; when the key cap 21 is in the second position and the focus ring rotates relative to the covering part 10, the toothed flange can rhythmically press the ball structure 23.
[0041] In the technical solution of the present application, the cover 10 is the basic structure of the lens assembly 100, providing a foundation for the installation and sliding of other components. A movable hole is formed through the side wall of the cover 10 along its circumference, and the movable hole allows the key cap 21 to move back and forth therein, that is, compared with the arrangement of the key cap 21 in the traditional conversion key 20 moving along the axial direction of the cover 10, the present application changes the key cap 21 to move along the circumference of the cover 10.
[0042] Among them, the preset sliding direction of the sliding block 22 is the axial direction of the covering member 10, and it can only move along the axial direction. After the key cap 21 passes through the movable hole and is inserted into the oblique guide groove 221, during the movement of the key cap 21, the key cap 21 can drive the sliding block 22 to move along the axial direction of the covering member 10 because of the mating contact with the oblique guide groove 221, thereby driving the ball structure 23 arranged at one end of the sliding block 22 to move along the axial direction of the covering member 10, and finally achieve: when the key cap 21 is in the first position, the ball structure 23 is kept isolated from the toothed flange; when the key cap 21 is in the second position and the focus ring rotates relative to the covering member 10, the toothed flange can rhythmically press the ball structure 23.
[0043] In summary, the technical solution of the present application, through a simple structural design, can achieve the purpose of tactile feedback when the focus ring rotates after the key cap 21 moves in the circumferential direction, so as to expand the distribution layout of the conversion key 20.
[0044] In some embodiments, the angle between the oblique guide groove 221 and the movable hole does not exceed 90°.
[0045] In this embodiment, by setting the angle, the extending direction of the oblique guide groove 221 and the extending direction of the active hole are roughly in the same direction, and the key cap 21 can abut against the sliding block 22 during the movement process to drive the sliding block 22 to move. More preferably, the angle between the oblique guide groove 221 and the active hole is 30° to 60°, which is the best setting choice.
[0046] See also Figure 4 As shown, in some embodiments, the keycap 21 includes a sliding portion 211 and a connecting portion 212; the sliding portion 211 is slidably disposed on the outer surface of the covering member 10, and the surface of the sliding portion 211 is designed with an anti-slip structure; the connecting portion 212 is a connecting column, one end of the connecting column passes through the movable hole and is connected to the middle position of the sliding portion 211, and the other end is inserted into the inclined guide groove 221.
[0047] In this embodiment, the sliding portion 211 is one of the main parts of the keycap 21. The sliding portion 211 is slidably disposed on the outer surface of the covering 10, so that the user can drive the internal sliding block 22 and the ball structure 23 by operating the keycap 21 outside the covering 10. Further, an anti-slip structure is designed on the surface of the sliding portion 211, so as to increase the friction between the user's fingers and the keycap 21, prevent the keycap 21 from accidentally sliding during operation, thereby improving the accuracy and stability of the operation. The connecting portion 212 is another important component of the keycap 21, which is in the form of a connecting column. The connecting column ensures a stable connection between the keycap 21 and the sliding block 22, so that the movement of the keycap 21 can accurately drive the sliding block 22 to slide along the axial direction of the covering 10.
[0048] Furthermore, the word "OFF" is marked on the surface of the cover 10 at the first position and the word "ON" is marked on the second position. The user can intuitively obtain the switch state of the switch key through the corresponding words on the sliding part 211.
[0049] See also Figure 1 , Figure 3 , Figure 4 as well as Figure 6 As shown, in some embodiments, the conversion key 20 also includes a mounting seat 24 installed on the inner wall of the covering member 10, a sliding channel 241 is formed in the middle of the mounting seat 24, and the sliding block 22 is slidably arranged in the sliding channel 241; wherein, a first avoidance hole 243 is opened on a side of the mounting seat 24 close to the side wall of the covering member 10 corresponding to the movable hole, and the connecting portion 212 passes through the first avoidance hole 243 and is inserted into the inclined guide groove 221.
[0050] In this embodiment, the mounting seat 24 can be locked to the inner wall of the covering member 10 by screws, and its main function is to provide a stable sliding channel 241 to ensure that the sliding block 22 can slide steadily and smoothly inside the mounting seat 24.
[0051] Further, a first avoidance hole 243 is provided on one side of the mounting seat 24 close to the side wall of the cover 10, corresponding to the position of the movable hole, and the avoidance hole can allow the connection part 212 (i.e., the connection column) to pass through, thereby connecting the keycap 21 and the sliding block 22. Specifically, one end of the connection part 212 is connected to the sliding part 211 through the movable hole and the first avoidance hole 243, and the other end is inserted into the inclined guide groove 221. This ensures that the movement of the keycap 21 can accurately drive the sliding block 22 to slide in the sliding channel 241.
[0052] See also Figure 4 as well as Figure 6 As shown, in some embodiments, guide rails 242 are formed on the opposite side walls of the sliding channel 241, and grooves 222 are formed on both sides of the sliding block 22 corresponding to the guide rails 242, so that the sliding block 22 slides along the sliding channel 241 through the cooperation between the guide rails 242 and the grooves 222.
[0053] In this embodiment, the guide rail 242 is a strip-shaped structure extending along the side wall of the sliding channel 241, providing guidance and support for the sliding block 22 during the sliding process. Grooves 222 are formed on both sides of the sliding block 22 at positions corresponding to the guide rails 242. The grooves 222 match the sizes of the guide rails 242, so that the sliding block 22 can fit tightly on the guide rails 242. When the sliding block 22 moves along the sliding channel 241, the cooperation between the grooves 222 and the guide rails 242 ensures that the sliding block 22 will not deviate from the predetermined sliding path, thereby improving the stability of the sliding block 22 and the accuracy of operation.
[0054] See also Figure 3 as well as Figure 4 As shown, in some embodiments, a second avoidance hole 244 is opened on a side of the mounting seat 24 away from the side wall of the covering member 10, and the connecting portion 212 also passes through the second avoidance hole 244; the conversion key 20 also includes a spring sheet 25, which is installed on the mounting seat 24 adjacent to the second avoidance hole 244; wherein, a bending portion 251 is formed in the middle portion of the spring sheet 25 corresponding to the second avoidance hole 244 and bent toward the second avoidance hole 244.
[0055] In this embodiment, both ends of the spring sheet 25 are locked on the mounting base 24 by screws. The spring sheet 25 is provided to provide feedback for the user to adjust the feel when the user drives the key cap 21 to switch between the first position and the second position.
[0056] Specifically, since the second avoidance hole 244 is formed on one side of the mounting seat 24 away from the side wall of the cover 10, the connection portion 212 in the keycap 21 can continue to extend through the second avoidance hole 244 until one end of the connection portion 212 is flush with the top of the bent portion 251. In this way, when the user drives the keycap 21 to move between the first position and the second position, the connection portion 212 needs to press the spring sheet 25 outward, and since the bent portion 251 forms a height difference between the crest and the trough, when the connection portion 212 moves from one side of the bent portion 251 to the other side, based on the pressing strength when passing through the height difference, feedback of the hand feeling during adjustment can be achieved.
[0057] See also Figure 4 as well as Figure 5 As shown, in some embodiments, a mounting seat body 223 is formed at one end of the sliding block 22, and a columnar accommodating chamber 2231 is formed through the mounting seat body 223; the ball structure 23 includes a ball 231, an abutment member 232 and an elastic member 233; the ball 231 is placed in the columnar accommodating chamber 2231; the abutment member 232 is arranged at one end of the columnar accommodating chamber 2231 away from the covering member 10, and is used to block the opening at one end of the columnar accommodating chamber 2231; the elastic member 233 is arranged between the ball 231 and the abutment member 232, and the elastic member 233 is used to press the ball 231 at the opening at the other end of the columnar accommodating chamber 2231; wherein, the inner diameter of the opening at the other end of the columnar accommodating chamber 2231 is smaller than the diameter of the ball 231.
[0058] In this embodiment, the mounting seat body 223 and the sliding block 22 can be integrally arranged, thereby enhancing the structural stability of the entire conversion key 20. A columnar accommodation chamber 2231 is formed through the mounting seat body 223. The cross-sectional shape of the columnar accommodation chamber 2231 is preferably cylindrical, which is the main installation space of the ball structure 23, and is used to accommodate the ball 231 and the elastic member 233, and can guide the movement of the ball 231 and the elastic member 233. The design of the columnar accommodation chamber 2231 ensures that these components can fit together tightly, thereby improving the stability and reliability of the ball structure 23.
[0059] The ball 231 is the main rolling component, which is used to interact with the toothed flange on the focus ring. When the inner diameter of the opening at the other end of the columnar accommodation chamber 2231 is smaller than the diameter of the ball 231, under the pressure of the elastic member 233, only no more than half of the ball 231 can be exposed from one end of the columnar accommodation chamber 2231, which can prevent the ball 231 from escaping from the columnar accommodation chamber 2231. This design can ensure that when the keycap 21 moves to the second position, the ball 231 can abut against the toothed flange of the focus ring.
[0060] It can be understood that the toothed flange is formed with alternating crests and troughs. When the focus ring rotates, the ball 231 contacts the crests and troughs on the toothed flange alternately under the action of the elastic member 233, thereby forming a rhythmic pressure on the ball 231. The rhythmic pressure can generate a collision between the ball 231 and the toothed flange, thereby realizing feedback on the focusing process.
[0061] The abutting member 232 and the mounting seat body 223 are detachably connected, so that the installation and replacement of the ball bearing 231 and the elastic member 233 in the mounting seat body 223 can be facilitated.
[0062] See also Figure 5 As shown, in some embodiments, the elastic member 233 includes a compression spring, one end of which abuts against the ball 231, and the other end abuts against the abutment 232. The compression spring is a common elastic element with excellent elasticity and recovery properties. In the ball structure 23, one end of the compression spring abuts against the ball 231, and the other end abuts against the abutment 232. When the ball 231 is pressed by the focus ring, the ball 231 applies pressure to the compression spring, causing the compression spring to deform. The elastic force of the compression spring resists this deformation and generates a reaction force to push the ball 231 back to its original position. This reaction force ensures that the ball 231 always maintains close contact with the toothed flange of the focus ring.
[0063] In summary, the present application provides a layout structure of a switch key 20 that can be driven by a user along the circumference of the cover 10, and can ultimately drive the ball structure 23 to move axially to achieve state conversion with the focus ring. When the switch key 20 is in the on state, the focus ring rotates and the movable ball 231 realizes the feedback of the rotation feel.
[0064] The present application also provides a lens, which includes the lens assembly 100 described above. The lens adopts all technical solutions of all embodiments of the lens assembly 100 described above, and therefore has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.
[0065] The present application also provides an image pickup device, which includes a camera body and the above lens, wherein the camera body and the lens are detachably connected. In this embodiment, the image pickup device adopts all the technical solutions of all the above lens embodiments, and therefore has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.
[0066] The above description is only a partial or preferred embodiment of the present application. Neither the text nor the drawings can limit the scope of protection of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the overall concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.
Claims
1. A lens assembly, characterized in that: include: A covering member, wherein a movable hole is formed through the side wall of the covering member along the circumference of the covering member; A conversion key, comprising a keycap, a sliding block and a ball bearing structure; the sliding block is slidably arranged on the inner side of the covering member, and an oblique guide groove is provided on the sliding block; the keycap passes through the movable hole and is inserted into the oblique guide groove, and the keycap can move back and forth in the movable hole to a first position and a second position, and the movement of the keycap drives the sliding block to slide along the axial direction of the covering member; the ball bearing structure is arranged at one end of the sliding block; A focus ring, rotatably connected to the covering member, the focus ring being provided with a toothed flange corresponding to the ball bearing structure; Wherein, when the keycap is in the first position, the ball structure and the toothed flange remain isolated; when the keycap is in the second position and the focus ring rotates relative to the covering member, the toothed flange can rhythmically press the ball structure.
2. The lens assembly according to claim 1, characterized in that: The angle between the oblique guide groove and the movable hole does not exceed 90°.
3. The lens assembly according to claim 1, characterized in that: The key cap comprises: A sliding portion, slidably disposed on the outer surface of the covering member, wherein the surface of the sliding portion is designed with an anti-slip structure; The connecting part is a connecting column, one end of which passes through the movable hole and is connected to the middle position of the sliding part, and the other end is inserted into the inclined guide groove.
4. The lens assembly according to claim 3, characterized in that: The conversion key further comprises a mounting seat mounted on the inner side wall of the covering member, a sliding channel is formed in the middle of the mounting seat, and the sliding block is slidably disposed in the sliding channel; A first avoidance hole is formed on one side of the mounting seat close to the side wall of the covering member and corresponds to the movable hole, and the connecting portion passes through the first avoidance hole and is inserted into the inclined guide groove.
5. The lens assembly according to claim 4, characterized in that: Guide rails are formed on opposite side walls of the sliding channel, and grooves are formed on both sides of the sliding block corresponding to the guide rails. The sliding block slides along the sliding channel through the cooperation between the guide rails and the grooves.
6. The lens assembly according to claim 4, characterized in that: A second avoidance hole is formed on a side of the mounting seat away from the side wall of the covering member, and the connecting portion also passes through the second avoidance hole; the switching key also includes a spring sheet, and the spring sheet is installed on the mounting seat adjacent to the second avoidance hole; Wherein, a bent portion is formed in the middle of the spring sheet corresponding to the second avoidance hole and is bent toward the second avoidance hole.
7. The lens assembly according to claim 1, characterized in that: A mounting seat is formed at one end of the sliding block, and a columnar accommodation chamber is formed through the mounting seat; the ball structure comprises: A ball is placed in the columnar accommodation chamber; An abutment member, disposed at one end of the columnar accommodation chamber away from the covering member, and used for blocking an opening at one end of the columnar accommodation chamber; an elastic member, disposed between the ball and the abutment member, the elastic member being used to press the ball at the opening at the other end of the columnar accommodation chamber; Wherein, the inner diameter of the opening at the other end of the columnar accommodation chamber is smaller than the diameter of the ball.
8. The lens assembly according to claim 7, characterized in that: The elastic member comprises a compression spring, one end of which abuts against the ball, and the other end of which abuts against the abutting member.
9. A lens, characterized in that: The lens comprises a lens assembly as described in any one of claims 1-8.
10. An image pickup device, characterized in that: The invention comprises a camera body and the lens as claimed in claim 9, wherein the camera body is detachably connected to the lens.