CN114815198B - Micro-distance shift lens - Google Patents
Micro-distance shift lensInfo
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- CN114815198B CN114815198B CN202210650441.0A CN202210650441A CN114815198B CN 114815198 B CN114815198 B CN 114815198B CN 202210650441 A CN202210650441 A CN 202210650441A CN 114815198 B CN114815198 B CN 114815198B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/24—Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances
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Abstract
本发明公开一种微距移轴镜头，其光学系统包括从物方到像面沿光轴依序设置有光焦度为正的第一透镜组、光焦度为负的第二透镜组、光焦度为正的第三透镜组及光焦度为负的第四透镜组，第一透镜组为前固定组，第四透镜组为后固定组，第二透镜组为补偿组，第三透镜组为变倍组，以使第二透镜组及第三透镜组移动，第一透镜组及第二透镜组之间设有光阑片。本发明一种微距移轴镜头通过采用四组连续变焦结构，以当物距从远到近变化时，第一透镜组和第四透镜组固定，第三透镜组向物方一侧移动，以改变镜头焦距，使镜头的放大率变大，第二透镜组向像面一侧移动，通过改变其与第三透镜组的相对位置，补偿像面因物距变化产生的偏移，使镜头始终清晰成像。
The present invention discloses a macro shift lens, the optical system of which 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 arranged in sequence along the optical axis from the object side to the image plane, 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, and the third lens group is a variable magnification group, so that the second lens group and the third lens group can be moved, and an aperture piece is arranged between the first lens group and the second lens group. The macro shift lens of the present invention adopts a four-group continuous zoom structure, so that when the object distance changes from far to near, the first lens group and the fourth lens group are fixed, the third lens group moves to the object side to change the focal length of the lens, so that the magnification of the lens becomes larger, and the second lens group moves to the image side, and by changing its relative position with the third lens group, the displacement of the image plane caused by the change of the object distance is compensated, so that the lens always forms a clear image.
Description
Technical Field
The invention relates to the technical field of camera lenses, in particular to a micro-distance 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, artworks, workpieces for close-range observation and the like. In recent years, with the development of online shopping, more and more merchants join in the line of online sales, and many merchants need to use macro lenses to take photos of goods and display the photos on the internet for customers to browse. Because different commodities have different characteristics, the positions of the photographed pictures needing to be emphasized are different, some pictures are in the middle, some pictures are in the edge positions, some pictures are in a special position, if the traditional macro lens is used for photographing the commodities, the traditional macro lens can only be clearly focused on a plane perpendicular to the center axis of the lens, so that photographing difficulty of commodities in the positions of the pictures, which are not in the center of the pictures, is greatly increased, the photographing difficulty of the commodities is often increased, and picture editing software is needed for picture editing in the later period. The moving shaft lens can swing the lens to shoot from different angles, and an inclined plane can be focused on a focal plane, so that an 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 bracket. However, the traditional shift lens has no macro function, the object distance of the lens with long focal length is far, macro shooting cannot be performed, and the shift lens with short focal length has small magnification and large distortion, and cannot take photos meeting the requirements although the minimum object distance is short.
Disclosure of Invention
The invention aims to solve the technical problem of providing a micro-distance shift lens which is used for shooting fine objects and can be used for directly closing any position of a picture.
The object of the invention is to provide a micro-lens with a positive focal power, a negative focal power, a positive third lens group and a negative fourth lens group, 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 variable magnification 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 that the focal length of the first lens group and the focal length of the macro-axis lens when the object distance at infinity is imaged clearly meet the following conditional expression:
0.45<f1/f0<0.55
Where f 1 denotes a focal length of the first lens group, and f 0 denotes a focal length of the macro shift lens when the object distance is clearly imaged at infinity.
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 meet the following conditional expression during focusing:
-1.35<f4/f123<-1.15
Wherein f 4 denotes a focal length of the fourth lens group, and f 123 denotes a combined focal length of the first lens group, the second lens group, and the third lens group.
The first lens group comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along an optical axis from an object space to an image space, the second lens group comprises a fifth lens, a sixth lens and a seventh lens which are sequentially arranged along the optical axis from the object space to the image space, the third lens group comprises an eighth lens, a ninth lens and a tenth lens which are sequentially arranged along the optical axis from the object space to the image space, the eighth lens and the ninth lens are arranged at intervals, and the fourth lens group comprises an eleventh lens.
The optical power 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 optical power of the third lens, the fifth lens, the sixth lens, the tenth lens and the eleventh lens are all negative.
The first lens group is arranged in the front lens barrel, the diaphragm sheet is arranged in the diaphragm sleeve group, the micro-distance shift lens comprises a base and a shift shaft adapter, a central shaft of the base is coaxial with an optical axis, the front lens barrel is arranged outside the base through the diaphragm sleeve group and is positioned at one end of the base, which is close to the object space, the second lens group is arranged in the base and is positioned at one end of the base, which is close to the object space, the third lens group is arranged in the base and is positioned at one end of the base, which is close to the image surface, the second lens group and the third lens group move along the base, the shift shaft adapter is sleeved outside one end of the base, which is close to the image surface, a shift shaft transmission part is connected to one end of the shift shaft adapter, the fourth lens group is arranged in the K lens group, and the K lens group is arranged at one end of the third lens barrel, which is close to the image surface, and is connected with one end of the base, which is close to the image surface.
The further technical scheme is that the radius of the joint surface of the moving shaft adapter and the radius of the joint surface of the moving shaft transmission piece meet the following conditions:
0.995<R7/R10<1
Wherein R7 represents the radius of the joint surface of the shaft-moving adapter, and R10 represents the radius of the joint surface of the shaft-moving transmission member.
The method is characterized in that the distance from the intersection point of the connecting surface of the movable shaft transmission piece and the optical axis to the circle center of the connecting surface and the distance from the intersection point of the connecting surface of the movable shaft transmission piece and the optical axis to the image surface meet the following conditional expression:
1.75<D1/D2<1.85
wherein D1 represents the distance from the intersection point of the connecting surface of the movable shaft transmission member and the optical axis to the circle center of the connecting surface, and D2 represents the distance from the intersection point of the connecting surface of the movable shaft transmission member and the optical axis to the image surface.
The technical scheme is that one end of the moving shaft transmission piece, which is close to the image surface, is connected with a corner lantern ring, one end of the corner lantern ring, which is close to the image surface, is provided with a bayonet socket, and the bayonet socket is locked on the corner lantern ring through a corner locking ring, so that the bayonet socket rotates 360 degrees around a central shaft on the corner lantern ring.
The rotary angle sleeve ring is characterized in that one end, close to an object, of the rotary angle sleeve ring is relatively provided with a shaft moving rack and a shaft moving limiting block which are parallel to an optical axis, a suspension end of the shaft moving limiting block stretches into the shaft moving adapter, a shaft moving locking screw is inserted into the shaft moving limiting block, the other end of the shaft moving locking screw stretches out of the shaft moving adapter and is sleeved in a locking knob, a shaft moving gear meshed with the shaft moving rack is arranged in the shaft moving adapter, the shaft moving adapter is provided with a shaft moving knob, and the shaft moving knob is coaxially connected with the shaft moving gear in a rotating mode and is arranged on the shaft moving adapter, wherein the modulus and the tooth number of the shaft moving rack meet the following conditional formulas:
R7=m×n
wherein m represents the modulus of the movable shaft rack, n represents the number of teeth of the movable shaft rack, and R7 represents the radius of the joint surface of the movable shaft adapter.
The invention has the beneficial technical effects that the micro-distance shift lens comprises the first lens group, the second lens group, the third lens group and the fourth lens group, wherein the first lens group, the second lens group, the third lens group and the fourth lens group are sequentially arranged from the object side to the image side along the optical axis, the first lens group, the second lens group, the third lens group and the fourth lens group are fixed when the object distance changes from far to near, the third lens group moves to the object side to change the focal length of the lens, the magnification of the lens is increased, the second lens group moves to the image side, the offset of the image side caused by the change of the object distance is compensated, the lens always forms clear images by changing the relative positions of the second lens group and the third lens group, so that the micro-distance lens has the functions of shooting and micro-distance, the distortion of the object imaging in micro-distance shooting is prevented, the micro-distance lens can be specially used at any position of a picture without an auxiliary bracket during shooting, the operation is convenient, the post-treatment is also unnecessary through picture editing software, the time is saved, 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 for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a macro lens according to an embodiment of the present invention;
fig. 2 is a side view of a macro lens according to an embodiment of the present invention;
Fig. 3 is a front view of a macro lens according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of the macro shift lens of FIG. 3 taken along line A-A;
FIG. 5 is a cross-sectional view of the macro shift lens of FIG. 3 taken along line B-B;
FIG. 6 is a diagram of an optical system in an initial state of a macro lens according to an embodiment of the present invention;
fig. 7 is a diagram of an optical system in a focusing operation state of a macro shift lens according to an embodiment of the present invention;
FIG. 8 is a graph showing the MTF of a macro lens according to an embodiment of the present invention when the object distance is infinity;
Fig. 9 is an MTF of the macro shift lens provided in the embodiment of the present invention when the object distance is 110 mm.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "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 this 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 present 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-axis lens provided in an embodiment of the present invention, an optical system of the macro-axis 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 side to an image side, 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 magnification-varying group, so that the second lens group G2 and the third lens group G3 move between the first lens group G and the fourth lens group G4, and a diaphragm S is disposed between the first lens group G1 and the second lens group G2.
The micro-distance shift lens comprises a first lens group G1, a second lens group G2, a third lens group G3 and a fourth lens group G4, wherein the first lens group G1, the second lens group G2, the third lens group G3 and the fourth lens group G4 are sequentially arranged from an object side to an image side along an optical axis, the second lens group G2 and the fourth lens group G4 are sequentially arranged from the object side to the image side, the offset generated by the object distance change is compensated, the lens is always imaged clearly, the functions of tele-shooting and micro-distance shooting are simultaneously provided, the object imaging in micro-distance shooting is prevented from being distorted, the special writing can be carried out at any position of a picture in the shooting process, the operation and the use are convenient by virtue of an auxiliary bracket, the picture is not required to be edited, the time is saved, and the market experience is wide.
Referring to fig. 6 and fig. 7, fig. 6 and fig. 7 show diagrams of optical systems of the macro shift lens in an initial state and a focusing operation state, respectively, as shown in fig. 6, dI is optical back focus. 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 the object distance at infinity is clearly imaged:
0.45<f1/f0<0.55 (1)
Where f 1 denotes a focal length of the first lens group G1, and f 0 denotes a focal length of the macro shift lens when the object distance is clearly imaged at infinity.
The ratio of the focal length of the first lens group G1 to the focal length of the macro axis lens when the object distance at infinity is clear to be imaged is greater than 0.45 and less than 0.55, so that the volume of the macro axis lens is not excessively large while the optical parameter requirements are satisfied. According to the condition (1), if the ratio of the focal length of the first lens group G1 to the focal length of the macro axis lens at the infinity object distance for clear imaging is not greater than 0.45, the optical power allocated by the first lens group G1 will be excessively large, which results in low tolerance performance of the whole lens and is unfavorable for mass production, and if the ratio of the focal length of the first lens group G1 to the focal length of the macro axis lens at the infinity object distance for clear imaging is not less than 0.55, the outer diameter of the lens will be greatly increased, which results in that the volume and weight of the lens greatly exceed those of conventional products, which is unfavorable for shooting work and market popularization.
Specifically, the focal length of the fourth lens group G4 and the combined focal length of the first lens group G1, the second lens group G2, and the third lens group G3 satisfy the following conditional expression when focusing:
-1.35<f4/f123<-1.15 (2)
where f 4 denotes a focal length of the fourth lens group G4, and f 123 denotes a combined focal length of the first lens group G1, the second lens group G2, and the third lens group G3.
During 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 as to ensure that the optical back focal length of the macro shift lens satisfies a shift structure while aberration correction. According to the condition (2), if 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 not greater than-1.35 during focusing, the focal power of the fourth lens group G4 is lower, which is unfavorable for correcting aberrations, and if 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 during focusing is not less than-1.15, the optical back focal length of the macro shift lens is shorter, so that there is not enough space for performing the shift structure 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 sequentially disposed 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 sequentially disposed 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 sequentially disposed 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 the present embodiment, the optical 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 optical 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.
The second lens L2 and the third lens L3 are glued to form a first glue lens, the sixth lens L6 and the seventh lens L7 are glued to form a second glue lens, and the ninth lens L9 and the tenth lens L0 are glued to form a third glue lens.
The following table gives the relevant parameter data of the present embodiment:
wherein R is the curvature radius of each surface;
The spacing between the faces (including air spacing and glass thickness);
nd, refractive index of each glass at d-ray;
vd, abbe coefficient of each glass in d light;
Focal length of 85 mm-50 mm
FNO:2.8~16
The half field angle is 14-9.2 DEG
The minimum value of the shooting object distance of the micro-distance shift lens is 110mm, the magnification is 1x, and the shift angle of the micro-distance shift lens can reach +/-8.5 degrees.
Specifically, in this embodiment, the first lens group G1 is disposed in the front lens barrel 1, the stop lens S is disposed in the stop lens sleeve, 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 the optical axis, the front lens barrel 1 is disposed outside the base 18 and is located at an end of the base 18 near the object side through the stop lens sleeve, the second lens group G2 is disposed in the base 18 and is located at an end of the base 18 near the object side, the third lens group G3 is disposed in the base 18 and is located at an end of the base 18 near the image plane, the second lens group G2 and the third lens group G3 move along the base 18, an end of the base 18 near the image plane is sleeved with the axis-shifting adapter 7, an end of the axis-shifting adapter 7 near the image plane is connected with an axis-shifting transmission member 10, the fourth lens group G4 is disposed in the K lens group 19, and the K lens group G3 is disposed at an end of the base 18 near the image plane.
The front lens barrel 1, the diaphragm sleeve group, 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 arranged in the compensation lens barrel 4 from the object side to the image side along the optical axis and then are tightly pressed by a pressing ring, the eighth lens L8, the ninth lens L9 and the tenth lens L10 and the corresponding spacer rings are sequentially arranged in the zoom lens barrel 6 from the object side to the image side along the optical axis and then are tightly pressed 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 sleeved with a cam 17 and is connected through guide nails, and the cam 17 is sleeved with a focusing collar 16. One end, close to the object space, of the moving shaft adapter seat 7 is connected with a focusing ring 5 through a screw, the focusing ring 5 is sleeved outside a focusing collar 16, and the focusing ring 5 is connected with a cam 17 through a notch milled by the focusing collar 16 through a guide screw, 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 cone 4 and the zoom lens cone 6 relatively move along a base 18. The eleventh lens L11 is mounted in the K lens barrel 19 and then is pressed by a pressing ring, and the K lens barrel 19 is connected to an end of the base 18 close to the image surface by screws.
Preferably, the diaphragm sleeve group comprises a diaphragm adjusting ring 3 and a diaphragm moving ring 2, the diaphragm sheet S is installed on the front lens barrel 1 after being installed in the diaphragm moving ring 2 and clamped by a clamping ring, the diaphragm adjusting ring 3 is connected with the diaphragm moving ring 2 through guide nails, so that the diaphragm moving ring 2 can be driven to rotate when the diaphragm adjusting ring 3 is rotated, and further the diaphragm aperture change is controlled, and the diaphragm adjusting ring 3 is sleeved on one end, close to an object side, of the adjusting sleeve ring 16, so that the front lens barrel 1 is arranged on one end, close to the object side, of the base 18 through the diaphragm sleeve group. The diaphragm adjusting ring 3, the focusing ring 5 and the moving shaft adapter 7 are sequentially sleeved outside the adjusting collar 16 along the direction from the object space to the image surface, and the diaphragm adjusting ring 3 and the moving shaft 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, the fourth lens L4 and the spacer are sequentially arranged in the front lens barrel 1 from the object side to the image plane along the optical axis and are locked by the pressing ring. The shaft moving adapter seat 7 and the shaft moving transmission piece 10 are respectively provided with mutually matched half-dovetail groove-shaped connecting structures.
Referring to fig. 5, as shown in fig. 5, I is an image plane, S7 is a joint surface of the shift shaft adapter 7 and the shift shaft transmission member 10, that is, a joint surface of the shift shaft transmission member 10 and the shift shaft adapter 7 is a joint surface of the shift shaft transmission member 10, Q is an intersection point of the joint surface S10 of the shift shaft transmission member 10 and an optical axis, and O is a center of the joint surface S10 of the shift shaft 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)
Wherein R7 represents the radius of the joint surface S7 of the shaft-moving adapter 7, and R10 represents the radius of the joint surface S10 of the shaft-moving transmission member 10.
The ratio of the radius of the engagement surface S7 of the shaft-moving adapter 7 to the radius of the engagement surface S10 of the shaft-moving transmission member 10 is greater than 0.995 and less than 1, so that the radius of the engagement surface S7 of the shaft-moving adapter 7 is slightly smaller than the radius of the engagement surface S10 of the shaft-moving transmission member 10, and the shaft-moving transmission member 10 can be tightly attached to the shaft-moving adapter 7 without being blocked when performing shaft-moving deflection, thereby realizing the shaft-moving shooting function. If the ratio of the radius of the engagement surface S7 of the shaft-moving adaptor 7 to the radius of the engagement surface S10 of the shaft-moving transmission member 10 is not greater than 0.995 or not less than 1, the shaft-moving adaptor 7 and the shaft-moving transmission member 10 will be blocked, and the shaft-moving function cannot be realized. Preferably, the radius of the engagement surface S7 of the shift adapter 7 may be 66mm.
Specifically, in this 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 expression:
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 to ensure that the macro axis-shifting lens does not have a dark angle in the axis-shifting process, and has enough space to reasonably distribute the dimension ratio of the axis-shifting adapter 7 to the axis-shifting transmission member 10, so as to realize the axis-shifting shooting function. If the ratio of D1 to D2 is not greater than 1.75, the size space of the axis shifting adapter 7 becomes small, the axis shifting adapter 7 is interfered during axis shifting, the preset axis shifting angle cannot be achieved, and if the ratio of D1 to D2 is not less than 1.85, the light of the edge view field of the macro axis shifting lens is easily blocked during axis shifting, and a dark angle is easily generated. 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 36.1mm.
With continued reference to fig. 1 to 9, specifically, one end of the moving shaft transmission member 10 near the image surface is connected with a corner collar 11, one end of the corner collar 11 near the image surface is provided with a bayonet socket 12, and the bayonet socket 12 is locked on the corner collar 11 through a corner locking ring 14, so that the bayonet socket 12 can rotate 360 ° around a central axis on the corner collar 11. The bayonet base 12 is fixed with a bayonet 13 by screws, so that the macro axis lens is mounted on the camera body.
Specifically, a shift rack 15 and a shift limiting block 22 parallel to the optical axis are relatively disposed at one end of the corner collar 11 near the object, the shift rack 15 may be vertically opposite to the shift limiting block 22, a 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, a shift gear 8 meshed with the shift rack 15 is disposed 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 disposed outside the shift adapter 7, the shift knob 9 is coaxially and rotatably connected with the shift gear 8 and is mounted on the shift adapter 7, so as to control the shift gear 8 to rotate through the shift knob 9, wherein the modulus and the number of teeth of the shift rack 15 satisfy the following conditions:
R7=m×n (5)
Where 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 shaft-moving rack 15 is equal to the radius of the joint surface S7 of the shaft-moving adapter 7, so that the shaft-moving knob 9 can smoothly drive the shaft-moving transmission member 10 to move and slide on the shaft-moving adapter 7. The shaft-moving limiting block 22 may be provided with a curved slot 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.
In summary, according to the macro axis lens provided by the invention, the optical system comprising the first lens group with positive focal power, 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, which are sequentially arranged from the object side to the image side along the optical axis, is arranged, the four groups of continuous zooming structures are adopted, so that when the object distance changes from far to near, the first lens group and the fourth lens group are fixed, the third lens group moves to the object side to change the focal length of the lens, the magnification of the lens is increased, the second lens group moves to the image side, the relative positions of the second lens group and the third lens group are changed, the offset generated by the change of the object distance is compensated, the lens always forms clear images, the functions of telephoto and macro shooting are simultaneously provided, the object imaging in the micro-distance shooting is prevented, the feature can be performed at any position of the picture without an auxiliary bracket, the operation and use are convenient, the post-processing is not required by picture software, the time is saved, the market experience is improved, and the market is wide.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (6)
1. The optical system of the micro-distance shift lens is characterized by 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, which are sequentially arranged from an object side to an image plane along an optical axis, 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 sheet is arranged between the first lens group and the second lens group;
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 the object distance at infinity is imaged clearly:
0.45<f1/f0<0.55
wherein f 1 represents the focal length of the first lens group, and f 0 represents the focal length of the macro axis lens when the object distance is imaged clearly at infinity;
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 expression when focusing:
-1.35<f4/f123<-1.15
Wherein f 4 denotes a focal length of the fourth lens group, and f 123 denotes a combined focal length of the first lens group, the second lens group, and the third lens group;
the first lens group comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along an optical axis from an object space to an image space, the second lens group comprises a fifth lens, a sixth lens and a seventh lens which are sequentially arranged along the optical axis from the object space to the image space, the third lens group comprises an eighth lens, a ninth lens and a tenth lens which are sequentially arranged along the optical axis from the object space to the image space, the eighth lens and the ninth lens are arranged at intervals, and the fourth lens group comprises an eleventh lens;
The focal power 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 power of the third lens, the fifth lens, the sixth lens, the tenth lens and the eleventh lens are all negative.
2. The micro-lens shift lens according to claim 1, wherein the first lens group is disposed in the front lens barrel, the diaphragm sheet is disposed in the diaphragm sleeve group, the micro-lens shift lens comprises a base and a shift adapter, a central axis of the base is coaxial with the optical axis, the front lens barrel is disposed outside the base through the diaphragm sleeve group and is located at one end of the base close to the object side, the second lens group is disposed in the base and is located at one end of the base close to the object side, the third lens group is disposed in the base and is located at one end of the base close to the image side, the second lens group and the third lens group move along the base, one end of the base close to the image side is sleeved with the shift adapter, one end of the shift adapter is connected with a shift transmission member, the fourth lens group is disposed in the K lens barrel, and the K lens group is disposed at one end of the third lens group close to the image side and is connected with one end of the base close to the image side.
3. The macro shift lens according to claim 2, wherein a radius of an engagement surface of the shift adapter and a radius of an engagement surface of the shift transmission member satisfy the following conditional expression:
0.995<R7/R10<1
Wherein R7 represents the radius of the joint surface of the shaft-moving adapter, and R10 represents the radius of the joint surface of the shaft-moving transmission member.
4. The macro shift lens according to claim 2, wherein a distance from a point of intersection of the engagement surface of the shift transmission member and the optical axis to a center of the engagement surface and a distance from a point of intersection of the engagement surface of the shift transmission member and the optical axis to an image plane satisfy the following conditional expression:
1.75<D1/D2<1.85
wherein D1 represents the distance from the intersection point of the connecting surface of the movable shaft transmission member and the optical axis to the circle center of the connecting surface, and D2 represents the distance from the intersection point of the connecting surface of the movable shaft transmission member and the optical axis to the image surface.
5. The macro shift lens according to claim 2, wherein one end of the shift transmission member, which is close to the image surface, is connected with a corner collar, one end of the corner collar, which is close to the image surface, is provided with a bayonet socket, and the bayonet socket is locked on the corner collar through a corner locking ring, so that the bayonet socket rotates 360 ° around a central axis on the corner collar.
6. The macro shift lens according to claim 5, wherein a shift rack and a shift limiting block parallel to an optical axis are relatively arranged at one end of the corner collar close to the object space, a free end of the shift limiting block extends into the interior of 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 in the shift adapter, a shift knob is arranged outside the shift adapter, the shift knob and the shift gear are coaxially and rotatably connected and mounted on the shift adapter, and the modulus and the number of teeth of the shift rack satisfy the following conditional expression:
R7=m×n
wherein m represents the modulus of the movable shaft rack, n represents the number of teeth of the movable shaft rack, and R7 represents the radius of the joint surface of the movable shaft adapter.
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| CN113848635B (en) * | 2021-10-28 | 2024-09-20 | 厦门力鼎光电股份有限公司 | A large zoom ratio lens |
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