A 35mm large target lens
By optimizing the optical structure of the 35mm lens through specific lens combinations and cemented lens design, the problem of balancing low cost, large target area, and high resolution was solved, achieving efficient imaging results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-15
- Publication Date
- 2026-06-16
AI Technical Summary
The existing 35mm lens structure cannot simultaneously meet the requirements of low cost, large target area and high resolution.
A specific lens combination and cemented lens design are adopted, including a first negative meniscus lens, a second positive meniscus lens, a third biconvex lens, a fourth biconcave lens, an aperture stop, a fifth biconvex lens, a sixth negative meniscus lens, and a seventh negative meniscus lens. The focal lengths of the lens combination meet certain relationships, and the optical structure is optimized by adjusting the distance from the front lens group to the aperture stop.
It achieves adjustment of 28mm target surface, F2.8 aperture, and working distance from 350mm to infinity, taking into account different application scenarios while maintaining high-resolution imaging quality.
Smart Images
Figure CN224366251U_ABST
Abstract
Description
Technical Field
[0001] This disclosure belongs to the field of lens technology and relates to a 35mm large-area lens. Background Technology
[0002] With the advancement of industrial automation and intelligent manufacturing, the application areas of machine vision technology are constantly expanding, and the requirements for industrial lenses are becoming increasingly stringent.
[0003] Existing 35mm lens structures are mostly six-element double-Gauss structures, or based on a six-element double-Gauss structure, an additional lens or a double-cemented component is added near the image plane. However, these cannot simultaneously meet the requirements of low cost, large target area, and high resolution. Utility Model Content
[0004] To overcome the above problems, this disclosure provides a 35mm large-area lens.
[0005] The technical solution disclosed herein is as follows:
[0006] A 35mm large target surface lens includes a first negative meniscus lens, a second positive meniscus lens, a third biconvex lens, a fourth biconcave lens, an aperture stop, a fifth biconvex lens, a sixth negative meniscus lens, and a seventh negative meniscus lens arranged sequentially from the object side to the image side along the optical axis.
[0007] The third biconvex lens and the fourth biconcave lens together form the first cemented lens;
[0008] The fifth biconvex lens and the sixth negative meniscus lens together form the second cemented lens;
[0009] The first negative meniscus lens, the second positive meniscus lens, the third biconvex lens, and the fourth biconcave lens form the front lens group, with a combined focal length of f1.
[0010] The fifth biconvex lens, the sixth negative meniscus lens, and the seventh negative meniscus lens form the rear lens group, with a combined focal length of f2.
[0011] The following conditions are satisfied between f1 and f2:
[0012] 28 <f1 / f2<32。
[0013] Furthermore, the refractive index of the third biconvex lens is Nd3, and the Abbe number is Vd3;
[0014] The fourth biconcave lens has a refractive index of Nd4 and an Abbe number of Vd4.
[0015] The third biconvex lens and the fourth biconcave lens satisfy the following:
[0016] 0.15 < |Nd3-Nd4| < 0.25;
[0017] 30 < |Vd3 - Vd4| < 40.
[0018] Furthermore, the refractive index of the fifth biconvex lens is Nd5 and the Abbe number is Vd5;
[0019] The refractive index of the sixth negative meniscus lens is Nd6 and the Abbe number is Vd6;
[0020] The fifth biconvex lens and the sixth negative meniscus lens satisfy:
[0021] |Nd5 - Nd6| < 0.5;
[0022] 10 < |Vd5 - Vd6| < 15.
[0023] Furthermore, the distance from the front lens group to the aperture stop is adjustable, and the adjustment range is 1.8 - 2.2 mm.
[0024] The present disclosure has the following beneficial effects:
[0025] The optical structure of the present disclosure has a small number of lenses, the target surface can reach 28 mm, the maximum aperture can reach F2.8, and the working distance is adjustable from 350 mm to infinity, which can accommodate different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a schematic diagram of the optical structure of an embodiment of the present disclosure at an object distance of 350 mm.
[0027] Figure 2 It is a schematic diagram of the optical structure of an embodiment of the present disclosure at an infinite object distance.
[0028] Figure 3 It is a modulation transfer function curve graph of an embodiment of the present disclosure at an object distance of 350 mm.
[0029] Figure 4 It is a modulation transfer function curve graph of an embodiment of the present disclosure at an infinite object distance.
[0030] The reference numerals in the drawings are represented as:
[0031] L1: The first negative meniscus lens; L2 The second positive meniscus lens; L3: The third biconvex lens; L4: The fourth biconcave lens; S: The aperture stop; L5: The fifth biconvex lens; L6: The sixth negative meniscus lens; L7 The seventh negative meniscus lens; J1: The first cemented lens; J2: The second cemented lens. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.
[0033] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes. To keep the following description of the embodiments of this disclosure clear and concise, detailed descriptions of some known functions and components are omitted.
[0034] The present disclosure will now be described in detail with reference to the accompanying drawings and specific embodiments.
[0035] A 35mm large target surface lens includes a first negative meniscus lens L1, a second positive meniscus lens L2, a third biconvex lens L3, a fourth biconcave lens L4, an aperture stop S, a fifth biconvex lens L5, a sixth negative meniscus lens L6, and a seventh negative meniscus lens L7 arranged sequentially from the object side to the image side along the optical axis.
[0036] The third biconvex lens L3 and the fourth biconcave lens L4 form the first cemented lens J1;
[0037] The fifth biconvex lens L5 and the sixth negative meniscus lens L6 form the second cemented lens J2;
[0038] The first negative meniscus lens L1, the second positive meniscus lens L2, the third biconvex lens L3, and the fourth biconcave lens L4 form the front lens group, with a combined focal length of f1.
[0039] The fifth biconvex lens L5, the sixth negative meniscus lens L6, and the seventh negative meniscus lens L7 form the rear lens group, with a combined focal length of f2.
[0040] The following conditions are satisfied between f1 and f2:
[0041] 28 < f1 / f2 < 32.
[0042] In an embodiment of the present disclosure, the refractive index of the third biconvex lens L3 is Nd3, and the Abbe number is Vd3;
[0043] The refractive index of the fourth biconcave lens L4 is Nd4, and the Abbe number is Vd4;
[0044] The third biconvex lens L3 and the fourth biconcave lens L4 satisfy:
[0045] 0.15 < |Nd3 - Nd4| < 0.25;
[0046] 30 < |Vd3 - Vd4| < 40.
[0047] In an embodiment of the present disclosure, the refractive index of the fifth biconvex lens L5 is Nd5, and the Abbe number is Vd5;
[0048] The refractive index of the sixth negative meniscus lens L6 is Nd6, and the Abbe number is Vd6;
[0049] The fifth biconvex lens L5 and the sixth negative meniscus lens L6 satisfy:
[0050] |Nd5 - Nd6| < 0.5;
[0051] 10 < |Vd5 - Vd6| < 15.
[0052] In an embodiment of the present disclosure, the distance from the front lens group to the aperture stop S is adjustable, and the adjustment range is 1.8~2.2 mm. This avoids the field curvature problem caused by the overall focusing of the conventional lens, thus affecting the imaging quality of the edge.
[0053] In an embodiment of the present disclosure, the parameters of each lens are shown in Table 1.
[0054] Table 1 Parameters of Each Lens in the Embodiment of the Present Disclosure
[0055]
[0056] In this embodiment, thickness 1 is the thickness parameter under the object distance of 350 mm, and thickness 2 is the thickness parameter under the object distance of infinity.
[0057] Figure 1 is the structural diagram for the object distance of 350 mm, Figure 2 is the structural diagram for the object distance of infinity.
[0058] Combined with Table 1, Figure 1 , Figure 2It can be seen that when adjusting the object distance, the R value and material parameters of the lens do not change, only the thickness of S7 and S13 is changed.
[0059] Figure 3 This is a modulation transfer function curve for this embodiment at an object distance of 350mm. Figure 4 This is a graph of the modulation transfer function when the object distance is at infinity in this embodiment.
[0060] Combination Figure 3 , Figure 4 It can be seen that the resolution remains at the highest level at different object distances, with the modulation transfer function value at 70 line pairs per millimeter being greater than 0.4. This indicates that the lens has high resolution and can handle imaging at object distances from 350mm to infinity.
[0061] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.
[0062] The units described in the embodiments of this disclosure can be implemented in software or hardware. The names of the units are not, in some cases, intended to limit the specific unit.
[0063] The functions described above in this document can be performed at least in part by one or more hardware logic components. For example, exemplary types of hardware logic components that can be used, without limitation, include: field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), system-on-a-chip (SoCs), complex programmable logic devices (CPLDs), and so on.
[0064] The above description is merely a preferred embodiment of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features disclosed in this disclosure that have similar functions.
[0065] Furthermore, while the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. In certain environments, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this disclosure. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.
[0066] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.
[0067] The following points should be noted regarding this disclosure:
[0068] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure. Other structures can be referred to the general design.
[0069] (2) Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.
[0070] The above description is merely an embodiment of this disclosure and does not limit the patent scope of this disclosure. Any equivalent structure made using the content of this disclosure and its drawings, or directly or indirectly applied to other related technical fields, is similarly included within the patent protection scope of this disclosure.
Claims
1. A 35mm large-aperture lens, characterized in that, It includes a first negative meniscus lens, a second positive meniscus lens, a third biconvex lens, a fourth biconcave lens, an aperture stop, a fifth biconvex lens, a sixth negative meniscus lens, and a seventh negative meniscus lens, which are sequentially arranged from the object side to the image side along the optical axis; The third biconvex lens and the fourth biconcave lens form a first cemented lens; The fifth biconvex lens and the sixth negative meniscus lens form a second cemented lens; The first negative meniscus lens, the second positive meniscus lens, the third biconvex lens, and the fourth biconcave lens form a front lens group, and the combined focal length is f1; The fifth biconvex lens, the sixth negative meniscus lens, and the seventh negative meniscus lens form a rear lens group, and the combined focal length is f2; The relationship between f1 and f2 satisfies: 28 < f1 / f2 < 32.
2. The 35mm large-area lens according to claim 1, characterized in that, The refractive index of the third biconvex lens is Nd3, and the Abbe number is Vd3; The refractive index of the fourth biconcave lens is Nd4, and the Abbe number is Vd4; The third biconvex lens and the fourth biconcave lens satisfy: 0.15 < |Nd3 - Nd4| < 0.25; 30 < |Vd3 - Vd4| < 40.
3. The 35mm large-area lens according to claim 2, characterized in that, The refractive index of the fifth biconvex lens is Nd5, and the Abbe number is Vd5; The refractive index of the sixth negative meniscus lens is Nd6, and the Abbe number is Vd6; The fifth biconvex lens and the sixth negative meniscus lens satisfy: |Nd5 - Nd6| < 0.5; 10 < |Vd5 - Vd6| < 15.
4. The 35mm large-area lens according to claim 3, characterized in that, The distance from the front lens group to the aperture stop is adjustable, and the adjustment range is between 1.8 and 2.2 mm.