CN217385980U - Micro-distance shift lens - Google Patents
Micro-distance shift lens Download PDFInfo
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- CN217385980U CN217385980U CN202221439851.2U CN202221439851U CN217385980U CN 217385980 U CN217385980 U CN 217385980U CN 202221439851 U CN202221439851 U CN 202221439851U CN 217385980 U CN217385980 U CN 217385980U
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Abstract
The utility model discloses a macro tilt lens, its optical system includes and is provided with the focal power according to the preface along the optical axis from the object space to image planes and be positive first battery of lens, the focal power is the negative second battery of lens, the focal power is positive third battery of lens and the focal power is the negative fourth battery of lens, first battery of lens is preceding fixed group, the fourth battery of lens is the after-fixing group, the second battery of lens is the compensation group, the third battery of lens is the group of becoming doubly to make second battery of lens and third battery of lens remove, be equipped with the diaphragm between first battery of lens and the second battery of lens. The utility model relates to a macro tilt-shift camera lens is through adopting four group's structures of zooming in succession to when the object distance changes from far away to near, first battery of lens and fourth battery of lens are fixed, and the third battery of lens moves to object space one side, in order to change the camera lens focus, makes the magnification grow of camera lens, and the second battery of lens moves to image planes one side, through changing its relative position with the third battery of lens, compensates image planes because of the skew that the object distance changes the production, makes the camera lens clear formation of image all the time.
Description
Technical Field
The utility model relates to a camera lens technical field especially relates to a microspur shift lens.
Background
The macro lens is a special lens for macro photography, and is mainly used for shooting fine objects such as flowers, insects, artware and close-range observation workpieces. In recent years, with the development of online shopping, more and more merchants join in the online sales line, and many merchants need to take pictures of commodities by using macro lenses to be displayed on the internet for customers to browse. Because the characteristics that different commodity possessed are different, the picture that shoots need the position difference of key feature, some are in the centre, some are in the border position, some are in certain special position of picture, if use traditional macro lens to shoot commodity, because traditional macro lens can only clearly focus on the plane of perpendicular to camera lens axis, this greatly increased those features do not in the shooting degree of difficulty of picture central point position commodity, often all need with the help of auxiliary stand during the shooting to the later stage needs picture editing software to carry out the picture editing. The shift lens can swing the lens and shoot from different angles, and can focus an inclined plane on a focal plane, so that the object on the inclined plane can be imaged clearly, and the creation of close-up shooting at any position of a picture can be realized without an auxiliary support. However, the traditional tilt-shift lens has no macro function, and the object distance of the lens with long focal length is far, so that macro shooting cannot be carried out; although the minimum object distance of the tilt-shift lens with a short focal length is short, macro shooting can be performed, but the magnification ratio is small, the distortion is large, and a picture meeting the requirements cannot be shot.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a microspur shift lens is provided in order to shoot slight object and can directly carry out the feature to the optional position of picture.
In order to solve the technical problem, the purpose of the utility model is realized through following technical scheme: the optical system of the macro shift lens comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power and a fourth lens group with negative focal power, which are sequentially arranged along an optical axis from an object space to an image surface, wherein the first lens group is a front fixed group, the fourth lens group is a rear fixed group, the second lens group is a compensation group, the third lens group is a zoom group, so that the second lens group and the third lens group move between the first lens group and the fourth lens group, and a diaphragm is arranged between the first lens group and the second lens group.
The further technical scheme is as follows: the following conditional expression is satisfied between the focal length of the first lens group and the focal length of the macro shift lens when an infinite object distance is clearly imaged:
0.45<f 1 /f 0 <0.55
in the formula, f 1 Denotes the focal length of the first lens group, f 0 The focal length of the macro shift lens when the infinite object distance is clearly imaged is shown.
The further technical scheme is as follows: the focal length of the fourth lens group and the combined focal length of the first lens group, the second lens group and the third lens group satisfy the following conditional expressions during focusing:
-1.35<f 4 /f 123 <-1.15
in the formula (f) 4 Denotes a focal length of the fourth lens group, f 123 The combined focal length of the first lens group, the second lens group and the third lens group is shown.
The further technical scheme is as follows: the first lens group comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from an object space to an image surface along an optical axis, the second lens group comprises a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from the object space to the image surface along the optical axis, the third lens group comprises an eighth lens, a ninth lens and a tenth lens which are sequentially arranged from the object space to the image surface along the optical axis, the eighth lens and the ninth lens are arranged at intervals, and the fourth lens group comprises an eleventh lens.
The further technical scheme is as follows: the focal powers of the first lens, the second lens, the fourth lens, the seventh lens, the eighth lens and the ninth lens are all positive, and the focal powers of the third lens, the fifth lens, the sixth lens, the tenth lens and the eleventh lens are all negative.
The further technical scheme is as follows: the first lens group is arranged in the front lens cone, the diaphragm is arranged in the diaphragm sleeve group, the macro axis-shifting lens comprises a base and an axis-shifting adapter, the central axis of the base is coaxial with the optical axis, the front lens cone is arranged outside the base through the diaphragm sleeve group and is positioned at one end of the base close to an object space, the second lens group is arranged in the base and positioned at one end of the base close to an object space, the third lens group is arranged in the base and positioned at one end of the base close to an image surface, the second lens group and the third lens group move along the base, the end of the base close to the image surface is sleeved with the shaft-shifting adapter, one end of the shaft-shifting adapter close to the image surface is connected with a shaft-shifting transmission piece, the fourth lens group is arranged in the K lens cones, the K lens cones are arranged at one end, close to the image surface, of the third lens group and connected with one end, close to the image surface, of the base.
The further technical scheme is as follows: the radius of the joint surface of the shift adapter and the radius of the joint surface of the shift transmission part satisfy the following conditional expression:
0.995<R7/R10<1
in the formula, R7 represents the radius of the engagement surface of the shift adapter, and R10 represents the radius of the engagement surface of the shift transmission member.
The further technical scheme is as follows: the distance from the intersection point of the connection surface of the shift transmission member and the optical axis to the circle center of the connection surface and the distance from the intersection point of the connection surface of the shift transmission member and the optical axis to the image surface satisfy the following conditional expressions:
1.75<D1/D2<1.85
in the formula, D1 represents the distance from the intersection point of the engagement surface of the shift transmission member and the optical axis to the center of the engagement surface, and D2 represents the distance from the intersection point of the engagement surface of the shift transmission member and the optical axis to the image plane.
The further technical scheme is as follows: one end, close to the image surface, of the shaft shifting transmission part is connected with a corner lantern ring, one end, close to the image surface, of the corner lantern ring is provided with a bayonet socket joint seat, and the bayonet socket joint seat is locked on the corner lantern ring through a corner locking ring, so that the bayonet socket joint seat rotates 360 degrees on the corner lantern ring around a central shaft.
The further technical scheme is as follows: a shift rack and a shift limiting block which are parallel to the optical axis are oppositely arranged on one end, close to the object space, of the corner lantern ring, the free end of the shift limiting block extends into the shift adapter, a shift locking screw is inserted into the shift limiting block, the other end of the shift locking screw extends out of the shift adapter and is sleeved in a locking knob, a shift gear meshed with the shift rack is arranged inside the shift adapter, a shift knob is arranged outside the shift adapter, and the shift knob is coaxially and rotatably connected with the shift gear and is arranged on the shift adapter; the modulus and the tooth number of the shift rack meet the following conditional expressions:
R7＝m×n
in the formula, m represents the modulus of the shift rack, n represents the number of teeth of the shift rack, and R7 represents the radius of the engagement surface of the shift adapter.
The utility model has the advantages of: the utility model relates to a macro-shift lens, which comprises an optical system comprising a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power and a fourth lens group with negative focal power, wherein the first lens group, the second lens group with negative focal power, the third lens group with positive focal power and the fourth lens group with negative focal power are sequentially arranged from an object space to an image surface along an optical axis, and the first lens group and the fourth lens group are fixed and the third lens group moves to one side of the object space to change the focal length of the lens so as to increase the magnification of the lens by adopting four groups of continuous zooming structures, the second lens group moves to one side of the image surface, the offset of the image surface caused by the change of the object distance is compensated by changing the relative position of the second lens group and the third lens group, so that the lens always forms clear images, and has the shooting functions of telephoto and macro simultaneously, the distortion of the object imaging during the macro-shooting is prevented, and the close-up can be carried out at any position of pictures during the shooting, the auxiliary support is not needed, the operation and the use are convenient, the post-processing through the picture editing software is not needed, the time is saved, the user experience is improved, and the market prospect is wide.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a macro tilt lens according to an embodiment of the present invention;
fig. 2 is a side view of a macro tilt lens provided in an embodiment of the present invention;
fig. 3 is a front view of a macro tilt lens provided in an embodiment of the present invention;
FIG. 4 is a cross-sectional view of the macro tilt lens shown in FIG. 3 taken along line A-A;
FIG. 5 is a cross-sectional view of the macro tilt lens shown in FIG. 3 taken along line B-B;
fig. 6 is a diagram of an optical system in an initial state of a macro tilt-shift lens according to an embodiment of the present invention;
fig. 7 is an optical system diagram of the macro tilt lens provided in the embodiment of the present invention in a focusing working state;
fig. 8 is an MTF of a macro tilt lens according to an embodiment of the present invention when an object distance is infinity;
fig. 9 is an MTF of the macro tilt lens according to an embodiment of the present invention when the object distance is 110 mm.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1 to 9, fig. 1 is a schematic structural diagram of a macro shift lens according to an embodiment of the present invention, an optical system of the macro shift lens includes a first lens group G1 with positive focal power, a second lens group G2 with negative focal power, a third lens group G3 with positive focal power, and a fourth lens group G4 with negative focal power sequentially disposed along an optical axis from an object space to an image plane, the first lens group G1 is a front fixed group, the fourth lens group G4 is a rear fixed group, the second lens group G2 is a compensation group, the third lens group G3 is a variable power group, so that the second lens group G2 and the third lens group G3 move between the first lens group G4 and the fourth lens group G2, and a stop sheet S is disposed between the first lens group G1 and the second lens group G2.
Wherein, the macro shift lens adopts an optical system comprising a first lens group G1 with positive focal power, a second lens group G2 with negative focal power, a third lens group G3 with positive focal power and a fourth lens group G4 with negative focal power, which are sequentially arranged along an optical axis from an object side to an image side, the first lens group G1 and the fourth lens group G4 are fixed and the third lens group G3 moves to the object side to change the focal length of the lens when the object distance changes from far to near by adopting a four-group continuous zooming structure, so that the magnification of the lens is increased, the second lens group 2 moves to the image side, the shift generated by the change of the object distance is compensated by changing the relative positions of the second lens group G2 and the third lens group G3, the lens always forms clear images, and has the shooting functions of telephoto and macro simultaneously, thereby preventing the object from generating image distortion during macro shooting, can carry out the feature in the optional position of picture when shooing, need not with the help of auxiliary stand, operation convenient to use also need not to carry out post processing through picture editing software, saves time, improves user experience, has wide market prospect.
Fig. 6 and 7 show optical system diagrams of the macro tilt lens in an initial state and a focusing operation state, respectively, with reference to fig. 6 and 7, where dI is an optical back focus, as shown in fig. 6. Specifically, the following conditional expression is satisfied between the focal length of the first lens group G1 and the focal length of the macro shift lens when an infinite object distance is clearly imaged:
0.45<f 1 /f 0 <0.55 (1)
in the formula (f) 1 Denotes a focal length, f, of the first lens group G1 0 The focal length of the macro shift lens when the infinite object distance is clearly imaged is shown.
The ratio of the focal length of the first lens group G1 to the focal length of the macro shift lens at the infinite object distance for sharp imaging is greater than 0.45 and less than 0.55, so that the macro shift lens does not have too large volume while satisfying the optical parameter requirements. According to the conditional expression (1), if the ratio of the focal length of the first lens group G1 to the focal length of the macro shift lens at infinity for sharp imaging is not greater than 0.45, the optical power allocated to the first lens group G1 will be too large, so that the tolerance performance of the whole lens is low, which is not suitable for mass production; if the ratio of the focal length of the first lens group G1 to the focal length of the macro shift lens in the clear imaging of the infinite object distance is not less than 0.55, the outer diameter of the lens is larger, so that the volume and the weight of the lens greatly exceed those of conventional products, and the lens is not favorable for shooting work and market popularization.
Specifically, the focal length of the fourth lens group G4 and the combined focal length of the first, second, and third lens groups G1, G2, and G3 satisfy the following conditional expressions in focusing:
-1.35<f 4 /f 123 <-1.15 (2)
in the formula (f) 4 Denotes a focal length, f, of the fourth lens group G4 123 The combined focal length of the first lens group G1, the second lens group G2, and the third lens group G3 is shown.
When focusing, the ratio of the focal length of the fourth lens group G4 to the combined focal length of the first lens group G1, the second lens group G2 and the third lens group G3 is greater than-1.35 and less than-1.15, so that the optical back focus of the macro shift lens meets the shift structure while aberration correction is ensured. According to the conditional expression (2), if the ratio of the focal length of the fourth lens group G4 to the combined focal length of the first, second and third lens groups G1, G2 and G3 is not more than-1.35 during focusing, the focal power of the fourth lens group G4 is low, which is not good for correcting aberrations; if the ratio of the focal length of the fourth lens group G4 to the combined focal length of the first, second and third lens groups G1, G2 and G3 is not less than-1.15 during focusing, the optical back focus of the macro shift lens is short, so that there is not enough space for the shift design.
Specifically, the first lens group G1 includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 which are sequentially arranged along an optical axis from an object side to an image side, the second lens group G2 includes a fifth lens L5, a sixth lens L6 and a seventh lens L7 which are sequentially arranged along the optical axis from the object side to the image side, the third lens group G3 includes an eighth lens L8, a ninth lens L9 and a tenth lens L10 which are sequentially arranged along the optical axis from the object side to the image side, the eighth lens L8 and the ninth lens L9 are disposed at intervals, and the fourth lens group G4 includes an eleventh lens L11.
Specifically, in this embodiment, the focal powers of the first lens L1, the second lens L2, the fourth lens L4, the seventh lens L7, the eighth lens L8 and the ninth lens L9 are all positive, and the focal powers of the third lens L3, the fifth lens L5, the sixth lens L6, the tenth lens L10 and the eleventh lens L11 are all negative. Preferably, the first lens L1, the second lens L2, the seventh lens L7, the eighth lens L8 and the ninth lens L9 are all biconvex lenses, the third lens L3, the fifth lens L5, the sixth lens L6, the tenth lens L10 and the eleventh lens L11 are all biconcave lenses, and the fourth lens L4 is a convex-concave lens.
Wherein the second lens L2 and the third lens L3 are cemented into a first cemented lens, the sixth lens L6 and the seventh lens L7 are cemented into a second cemented lens, and the ninth lens L9 and the tenth lens L0 are cemented into a third cemented lens.
The following table gives the data of the relevant parameters of this example:
wherein, R: the radius of curvature of each face;
d: the spacing between the faces (including air space and glass thickness);
nd: the refractive index of each glass in d light;
vd: abbe number of each glass at d-ray;
focal length: 85 mm-50 mm
FNO：2.8～16
Half field angle: 14-9.2 degree
The minimum value of the shooting object distance of the macro shift lens is 110mm, the magnification is 1x, and the shift angle of the macro shift lens can reach +/-8.5 degrees.
Specifically, in this embodiment, the first lens group G1 is disposed in the front barrel 1, the diaphragm sheet S is disposed in the diaphragm set, the macro axis-shifting lens includes a base 18 and an axis-shifting adapter 7, a central axis of the base 18 is coaxial with an optical axis, the front barrel 1 is disposed outside the base 18 through the diaphragm set and is located at an end of the base 18 close to an object, the second lens group G2 is disposed in the base 18 and is located at an end of the base 18 close to the object, the third lens group G3 is disposed in the base 18 and is located at an end of the base 18 close to an image plane, the second lens group G2 and the third lens group G3 move along the base 18, the end of the base 18 close to the image plane is sleeved with the axis-shifting adapter 7, an end of the axis-shifting adapter 7 close to the image plane is connected to an axis-shifting transmission element 10, the fourth lens group G4 is arranged in a K-piece lens barrel 19, and the K-piece lens barrel 19 is arranged at one end, close to the image plane, of the third lens group G3 and connected with one end, close to the image plane, of the base 18.
The front lens barrel 1, the diaphragm sleeve set, the base 18 and the shift adapter 7 are coaxially arranged, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are sequentially mounted in the compensation lens barrel 4 from the object side to the image side along the optical axis and then are compressed by a pressing ring, the eighth lens L8, the ninth lens L9 and the tenth lens L10 and corresponding spacers are sequentially mounted in the zoom lens barrel 6 from the object side to the image side along the optical axis and then are compressed by a pressing ring, and the compensation lens barrel 4 and the zoom lens barrel 6 are arranged in the base 18. The base 18 is externally provided with a cam 17 and connected through a guide nail, and the cam 17 is externally provided with a focusing lantern ring 16. One end, close to an object space, of the shift shaft adapter 7 is connected with a focusing ring 5 through a screw, the focusing ring 5 is sleeved outside a focusing sleeve ring 16, and the focusing ring 5 penetrates through a notch milled in the focusing sleeve ring 16 through a guide screw and is connected with a cam 17, so that the cam 17 can be driven to rotate along an optical axis when the focusing ring 5 is rotated, and the compensation lens barrel 4 and the zoom lens barrel 6 are relatively displaced along a base 18. The eleventh lens L11 is mounted in the K-piece lens barrel 19 and then pressed by a pressing ring, and the K-piece lens barrel 19 is connected with one end of the base 18 close to the image plane by screws.
Preferably, the diaphragm set comprises a diaphragm adjusting ring 3 and a diaphragm moving ring 2, the diaphragm sheets S are mounted on the front lens barrel 1 after being mounted on the diaphragm moving ring 2 and are clamped by a clamping ring, and the diaphragm adjusting ring 3 is connected with the diaphragm moving ring 2 through a guide pin, so that the diaphragm moving ring 2 can be driven to rotate when the diaphragm adjusting ring 3 is rotated, thereby controlling the aperture change of the diaphragm; the diaphragm adjusting ring 3 is sleeved on one end of the adjusting sleeve ring 16 close to the object space, so that the front lens barrel 1 is arranged on one end of the base 18 close to the object space through the diaphragm sleeve. The diaphragm adjusting ring 3, the focusing ring 5 and the shift adapter 7 are sequentially sleeved outside the adjusting sleeve ring 16 along the direction from an object space to an image surface of an optical axis, and the diaphragm adjusting ring 3 and the shift adapter 7 are respectively connected with two ends of the focusing ring 5. The first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 and the spacer are sequentially arranged in the front lens barrel 1 from the object side to the image side along the optical axis and are locked by a pressing ring. The shaft moving adapter 7 and the shaft moving transmission part 10 are respectively provided with a half dovetail groove-shaped connecting structure which is matched with each other.
Referring to fig. 5, as shown in fig. 5, I is an image plane; s7 is an engagement surface between the shift adapter 7 and the shift transmission member 10, i.e., an engagement surface of the shift adapter 7; s10 is the engagement surface between the shift transmission member 10 and the shift adapter 7, i.e. the engagement surface of the shift transmission member 10; q is the intersection point of the connecting surface S10 of the shift transmission member 10 and the optical axis; o is the center of the engaging surface S10 of the shift transmission member 10. Specifically, the radius of the engagement surface S7 of the shift adapter 7 and the radius of the engagement surface S10 of the shift transmission member 10 satisfy the following conditional expression:
0.995<R7/R10<1 (3)
where R7 denotes the radius of the abutment surface S7 of the shift adapter 7 and R10 denotes the radius of the abutment surface S10 of the shift transmission element 10.
The ratio of the radius of the connecting surface S7 of the shift adapter 7 to the radius of the connecting surface S10 of the shift transmission member 10 is greater than 0.995 and less than 1, so that the radius of the connecting surface S7 of the shift adapter 7 is slightly smaller than the radius of the connecting surface S10 of the shift transmission member 10, and the shift transmission member 10 can be ensured to be tightly attached to the shift adapter 7 without being locked during shift deflection, thereby realizing the shift shooting function. If the ratio of the radius of the engagement surface S7 of the shift adapter 7 to the radius of the engagement surface S10 of the shift transmission element 10 is not greater than 0.995 or not less than 1, the shift adapter 7 and the shift transmission element 10 will be locked and the shift function will not be realized. Preferably, the radius of the engagement surface S7 of the shift adapter 7 may be 66 mm.
Specifically, in the present embodiment, the distance from the intersection point Q of the engagement surface S10 of the shift transmission member 10 and the optical axis to the center O of the engagement surface S10 of the shift transmission member 10 and the distance from the intersection point Q of the engagement surface S10 of the shift transmission member 10 and the optical axis to the image plane I satisfy the following conditional expressions:
1.75<D1/D2<1.85(4)
in the formula, D1 represents the distance from the intersection point Q of the engagement surface S10 of the shift transmission member 10 and the optical axis to the center O of the engagement surface S10 of the shift transmission member 10, and D2 represents the distance from the intersection point Q of the engagement surface S10 of the shift transmission member 10 and the optical axis to the image plane I.
The ratio of D1 to D2 is greater than 1.75 and less than 1.85, so that a dark corner cannot appear in the process of shaft shifting of the macro shift lens, and meanwhile, the size proportion of the shaft shifting adapter 7 and the shaft shifting transmission piece 10 is reasonably distributed in enough space, and the function of shaft shifting shooting is achieved. If the ratio of D1 to D2 is not greater than 1.75, the size space of the shift adapter 7 becomes smaller, and the shift adapter 7 interferes during the shift, so that the predetermined shift angle cannot be reached; if the ratio of D1 to D2 is not less than 1.85, the peripheral field rays of the macro shift lens are easily blocked and dark corners easily occur during shifting. Preferably, the distance from the intersection point Q of the engagement surface S10 of the shift transmission member 10 and the optical axis to the image plane I may be 36.1 mm.
With reference to fig. 1 to 9, specifically, one end of the shift transmission member 10 close to the image plane is connected to a corner collar 11, one end of the corner collar 11 close to the image plane is provided with a bayonet socket 12, and the bayonet socket 12 is locked to the corner collar 11 by a corner locking ring 14, so that the bayonet socket 12 can rotate on the corner collar 11 for 360 degrees around the central axis. Wherein, a bayonet 13 is fixed on the bayonet socket 12 through a screw, so as to install the macro tilt-shift lens on the camera body.
Specifically, a shift rack 15 and a shift limiting block 22 which are parallel to the optical axis are oppositely arranged on one end of the corner lantern ring 11 close to the object space, the shift rack 15 can be vertically opposite to the shift limiting block 22, the free end of the shift limiting block 22 extends into the shift adapter 7, a shift locking screw 21 is inserted into the shift limiting block 22, the other end of the shift locking screw 21 extends out of the shift adapter 7 and is sleeved in a locking knob 20, and a shift gear 8 meshed with the shift rack 15 is arranged in the shift adapter 7, so that the shift gear 8 is in transmission connection with the shift rack 15; a shift knob 9 is arranged outside the shift adapter 7, and the shift knob 9 is coaxially and rotatably connected with the shift gear 8 and is arranged on the shift adapter 7 so as to control the shift gear 8 to rotate through the shift knob 9; the modulus and the number of teeth of the shift rack 15 satisfy the following conditional expressions:
R7＝m×n (5)
in the formula, m represents the modulus of the shift rack 15, n represents the number of teeth of the shift rack 15, and R7 represents the radius of the engagement surface S7 of the shift adapter 7.
The product of the modulus and the number of teeth of the shift rack 15 is equal to the radius of the engaging surface S7 of the shift adapter 7, so that the shift knob 9 can smoothly drive the shift transmission member 10 to slide on the shift adapter 7. The shaft moving limiting block 22 may be provided with a curved groove for inserting one end of the shaft moving locking screw 21, so that one end of the shaft moving locking screw 21 is inserted into the shaft moving limiting block 22.
To sum up, the present invention provides a macro tilt-shift lens, which comprises an optical system including a first lens group having positive focal power, a second lens group having negative focal power, a third lens group having positive focal power and a fourth lens group having negative focal power, which are sequentially arranged along an optical axis from an object space to an image plane, wherein the first lens group and the fourth lens group are fixed and the third lens group is moved to an object space side to change a focal length of the lens, thereby increasing a magnification of the lens, and the second lens group is moved to an image plane side, thereby compensating a shift of the image plane caused by a change in the object distance by changing a relative position of the second lens group and the third lens group, thereby forming a clear image of the lens all the time, and providing a shooting function of telephoto and macro simultaneously, thereby preventing an object image from being distorted during macro shooting, can carry out the feature in the optional position of picture when shooing, need not with the help of auxiliary stand, operation convenient to use also need not to carry out post processing through picture editing software, saves time, improves user experience, has wide market prospect.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The optical system of the macro shift lens comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power and a fourth lens group with negative focal power, which are sequentially arranged along an optical axis from an object space to an image surface, wherein the first lens group is a front fixed group, the fourth lens group is a rear fixed group, the second lens group is a compensation group, the third lens group is a zoom group, so that the second lens group and the third lens group move between the first lens group and the fourth lens group, and a diaphragm is arranged between the first lens group and the second lens group.
2. The macro shift lens according to claim 1, wherein the following conditional expression is satisfied between a focal length of the first lens group and a focal length of the macro shift lens at the time of sharp imaging at an infinite object distance:
0.45<f 1 /f 0 <0.55
in the formula (f) 1 Denotes the focal length of the first lens group, f 0 The focal length of the macro shift lens when the infinite object distance is clearly imaged is shown.
3. The macro shift lens according to claim 1, wherein the focal length of the fourth lens group G4 and the combined focal length of the first, second, and third lens groups G1, G2, and G3 satisfy the following conditional expressions in focusing:
-1.35<f 4 /f 123 <-1.15
in the formula (f) 4 Denotes a focal length, f, of the fourth lens group G4 123 The combined focal length of the first lens group G1, the second lens group G2, and the third lens group G3 is shown.
4. The macro shift lens system according to claim 1, wherein the first lens group includes a first lens, a second lens, a third lens and a fourth lens sequentially arranged along an optical axis from an object side to an image surface, the second lens group includes a fifth lens, a sixth lens and a seventh lens sequentially arranged along the optical axis from the object side to the image surface, the third lens group includes an eighth lens, a ninth lens and a tenth lens sequentially arranged along the optical axis from the object side to the image surface, the eighth lens and the ninth lens are spaced apart, and the fourth lens group includes an eleventh lens.
5. The macro tilt lens according to claim 4, wherein the powers of the first, second, fourth, seventh, eighth and ninth lenses are all positive, and the powers of the third, fifth, sixth, tenth and eleventh lenses are all negative.
6. The macro tilt-shift lens according to claim 1, wherein the first lens group is disposed in a front barrel, the diaphragm is disposed in a diaphragm sleeve, the macro tilt-shift lens includes a base and a tilt-shift adapter, a central axis of the base is coaxial with an optical axis, the front barrel is disposed outside the base through the diaphragm sleeve and is located at an end of the base close to an object, the second lens group is disposed in the base and is located at an end of the base close to the object, the third lens group is disposed in the base and is located at an end of the base close to an image plane, the second lens group and the third lens group move along the base, the tilt-shift adapter is sleeved outside an end of the base close to the image plane, a tilt-shift transmission member is connected to an end of the tilt-shift adapter close to the image plane, and the fourth lens group is disposed in a K-piece barrel, the K lens barrels are arranged at one end, close to the image surface, of the third lens group and connected with one end, close to the image surface, of the base.
7. The macro tilt lens according to claim 6, wherein a radius of the engagement surface of the tilt adapter and a radius of the engagement surface of the tilt transmission member satisfy the following conditional expression:
0.995<R7/R10<1
in the formula, R7 represents the radius of the engagement surface of the shift adapter, and R10 represents the radius of the engagement surface of the shift transmission member.
8. The macro tilt-shift lens according to claim 6, wherein the distance from the intersection point of the joining surface of the tilt-shift transmission member and the optical axis to the center of the joining surface and the distance from the intersection point of the joining surface of the tilt-shift transmission member and the optical axis to the image plane satisfy the following conditional expressions:
1.75<D1/D2<1.85
in the formula, D1 represents the distance from the intersection point of the engagement surface of the shift transmission member and the optical axis to the center of the engagement surface, and D2 represents the distance from the intersection point of the engagement surface of the shift transmission member and the optical axis to the image plane.
9. The macro tilt-shift lens according to claim 6, wherein an angle-rotation collar is connected to an end of the tilt-shift transmission member close to the image plane, a bayonet mount is provided at an end of the angle-rotation collar close to the image plane, and the bayonet mount is locked to the angle-rotation collar by an angle-rotation locking ring, so that the bayonet mount rotates 360 ° around the central axis on the angle-rotation collar.
10. The macro tilt-shift lens according to claim 9, wherein a tilt-shift rack parallel to an optical axis and a tilt-shift limiting block are oppositely disposed on one end of the corner lantern ring close to the object space, a free end of the tilt-shift limiting block extends into the tilt-shift adapter, a tilt-shift locking screw is inserted into the tilt-shift limiting block, the other end of the tilt-shift locking screw extends out of the tilt-shift adapter and is sleeved in a locking knob, a tilt-shift gear engaged with the tilt-shift rack is disposed inside the tilt-shift adapter, a tilt-shift knob is disposed outside the tilt-shift adapter, and the tilt-shift knob is coaxially and rotatably connected with the tilt-shift gear and is mounted on the tilt-shift adapter; the modulus and the tooth number of the shift rack meet the following conditional expressions:
R7＝m×n
in the formula, m represents the modulus of the shift rack, n represents the number of teeth of the shift rack, and R7 represents the radius of the engagement surface of the shift adapter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221439851.2U CN217385980U (en) | 2022-06-09 | 2022-06-09 | Micro-distance shift lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221439851.2U CN217385980U (en) | 2022-06-09 | 2022-06-09 | Micro-distance shift lens |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116088251A (en) * | 2023-02-08 | 2023-05-09 | 广州长步道光学科技有限公司 | Connecting device capable of adjusting lens angle and camera with same |
| CN116300014A (en) * | 2022-12-07 | 2023-06-23 | 福建福光股份有限公司 | Two-gear switching type zoom lens structure |
| WO2024124930A1 (en) * | 2022-12-13 | 2024-06-20 | 杭州海康机器人股份有限公司 | Scheimpflug lens assembly and camera |
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2022
- 2022-06-09 CN CN202221439851.2U patent/CN217385980U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116300014A (en) * | 2022-12-07 | 2023-06-23 | 福建福光股份有限公司 | Two-gear switching type zoom lens structure |
| WO2024124930A1 (en) * | 2022-12-13 | 2024-06-20 | 杭州海康机器人股份有限公司 | Scheimpflug lens assembly and camera |
| CN116088251A (en) * | 2023-02-08 | 2023-05-09 | 广州长步道光学科技有限公司 | Connecting device capable of adjusting lens angle and camera with same |
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