Zoom lens

Abstract

The utility model relates to the technical field of lenses, and discloses a zoom lens, which comprises a shell, a light source, a first fixed lens group, a zoom lens, a second fixed lens group and a traction mechanism, the light source, the first fixed lens group, the zoom lens and the second fixed lens group are arranged on the shell, the light source is used for emitting laser, and the light source, the first fixed lens group, the zoom lens and the second fixed lens group are sequentially arranged in the laser propagation direction. The first fixed lens group and the second fixed lens group are fixedly arranged, and the traction mechanism is in transmission connection with the zoom lens so as to drive the zoom lens to move between the first fixed lens group and the second fixed lens group. As the zoom lens is located between the first fixed lens group and the second fixed lens group, the number of lenses and the complexity of the zoom lens can be reduced, and the zoom lens with a larger zoom range can be obtained under a simpler architecture.

Description

Technical Field

[0001] The present disclosure relates to the technical field of lenses, and in particular to a zoom lens. Background Art

[0002] With the development of technology, the miniaturization of lenses has become a trend in various industries. In order to adapt to various operating scenarios, zoom lenses are used. However, the current zoom lenses are large in size and heavy in weight, making them difficult to be used in miniaturized products. Utility Model Content

[0003] The present disclosure proposes a zoom lens to solve the technical problem of large size of zoom lenses in the prior art.

[0004] In order to solve the above technical problems, the present disclosure provides a zoom lens, including a housing, a light source, a first fixed lens group, a variable magnification lens, a second fixed lens group and a traction mechanism;

[0005] The light source, the first fixed lens group, the magnification lens and the second fixed lens group are arranged on the shell, the light source is used to emit laser, and along the propagation direction of the laser, the light source, the first fixed lens group, the magnification lens and the second fixed lens group are arranged in sequence, the first fixed lens group and the second fixed lens group are fixedly arranged, and the traction mechanism is connected to the magnification lens in a transmission manner to drive the magnification lens to move between the first fixed lens group and the second fixed lens group.

[0006] Optionally, the first fixed lens group includes at least one first lens, the optical power of the first lens is a positive value, and the first lens is a positive lens or a negative lens.

[0007] Optionally, the first lens is a glass lens.

[0008] Optionally, the number of the variable magnification lens is one, the optical focal length of the variable magnification lens is a negative value, and the variable magnification lens is a positive lens or a negative lens.

[0009] Optionally, the second fixed lens group includes at least one second lens, the optical power of the second lens is a positive value, and the second lens is an aspherical curved lens.

[0010] Optionally, the light emission angle of the first fixed lens group is ≤12°, and the refractive index of the first fixed lens group is: 2.0≥Nd1≥1.8, wherein Nd1 is the refractive index of the first fixed lens group.

[0011] Optionally, the light output angle of the variator lens is 50° to 130°, and the refractive index of the variator lens is: 2.1≥Nd2≥1.75, wherein Nd2 is the refractive index of the variator lens.

[0012] Optionally, the light emission angle of the second fixed lens group is 2° to 70°, and the refractive index of the second fixed lens group is: 2.0≥Nd3≥1.8, wherein Nd3 is the refractive index of the second fixed lens group.

[0013] Compared with the prior art, in the zoom lens disclosed in the present invention, the housing is used to install the light source, the first fixed lens group, the zoom lens, the second fixed lens group and the traction mechanism, and the light source, the first fixed lens group, the zoom lens, the second fixed lens group and the traction mechanism can be installed inside the housing. The traction mechanism can be a stepping motor.

[0014] In the zoom lens disclosed in the present invention, the zoom lens is driven by the traction mechanism to move between the first fixed lens group and the second fixed lens group, so that the zoom output of the laser can be achieved. Since the zoom lens is located between the first fixed lens group and the second fixed lens group, the number of lenses and the complexity of the zoom lens can be reduced, and a zoom lens with a large zoom range can be obtained under a relatively simple structure. The protection of the shell can achieve airtightness.

[0015] After the laser emitted by the light source is output from the second fixed lens group, its light output angle can be changed between 2° and 70°, and the zoom focal length can meet the requirements of f max / f min ≥5, where f max is the maximum focal length, f min is the minimum focal length. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0017] Figure 1 is a schematic structural diagram of a zoom lens in one embodiment of the present disclosure;

[0018] Figure 2 is another structural schematic diagram of a zoom lens in an embodiment of the present disclosure, wherein the zoom lens is in a short-focus state;

[0019] Figure 3 is another structural schematic diagram of a zoom lens in an embodiment of the present disclosure, wherein the zoom lens is in a medium focus state;

[0020] Figure 4 Schematic diagram of another structure of a zoom lens in an embodiment of the present disclosure, wherein the zoom lens is in a telephoto state.

[0021] Figure 5FIG. 4 is a schematic diagram of imaging of a zoom lens in an embodiment of the present disclosure.

[0022] Figure 6 FIG. 4 is another imaging schematic diagram of a zoom lens in an embodiment of the present disclosure.

[0023] Figure 7 FIG. 4 is another imaging schematic diagram of a zoom lens in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present disclosure, the present disclosure is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not used to limit the present disclosure. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0026] In addition, the terms first, second, third, etc. in the specification and claims are only used for the purpose of describing the same technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, nor necessarily describing the order or time sequence. The terms are interchangeable where appropriate. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0027] Similarly, the terms "fixed" and "connected" used in the specification and claims should not be construed as limited to direct connection. Therefore, the expression "device A is connected to device B" should not be limited to a device or system in which device A is directly connected to device B, but means that there is a path between device A and device B, which may be a path including other devices or tools.

[0028] In addition, the technical features involved in different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

[0029] Please refer to Figures 1 to 7The embodiment of the present disclosure provides a zoom lens, comprising a housing (not shown in the figure), a light source 10, a first fixed lens group 20, a zoom lens 30, a second fixed lens group 40 and a traction mechanism (not shown in the figure); the light source 10, the first fixed lens group 20, the zoom lens 30 and the second fixed lens group 40 are arranged on the housing, the light source 10 is used to emit laser, along the propagation direction of the laser, the light source 10, the first fixed lens group 20, the zoom lens 30 and the second fixed lens group 40 are arranged in sequence, the first fixed lens group 20 and the second fixed lens group 40 are fixedly arranged, and the traction mechanism is connected to the zoom lens 30 in transmission to drive the zoom lens 30 to move between the first fixed lens group 20 and the second fixed lens group 40.

[0030] In the zoom lens of this embodiment, the housing is used to install the light source 10, the first fixed lens group 20, the zoom lens 30, the second fixed lens group 40 and the traction mechanism, and the light source 10, the first fixed lens group 20, the zoom lens 30, the second fixed lens group 40 and the traction mechanism can be installed inside the housing. The traction mechanism can be a stepping motor.

[0031] In the zoom lens of this embodiment, the zoom lens 30 is driven by the traction mechanism to move between the first fixed lens group 20 and the second fixed lens group 40, so that the laser zoom output can be achieved. Since the zoom lens 30 is located between the first fixed lens group 20 and the second fixed lens group 40, the number of lenses and the complexity of the zoom lens can be reduced, and a zoom lens with a large zoom range can be obtained under a relatively simple structure. The protection of the shell can achieve airtightness.

[0032] After the laser emitted by the light source 10 is output from the second fixed lens group 40, its light output angle can be changed between 2° and 70°, and the zoom focal length can meet the requirements of f max / f min ≥5, where f max is the maximum focal length, f min is the minimum focal length.

[0033] In one embodiment, the first fixed lens group 20 includes at least one first lens, the optical power of the first lens is positive, and the first lens is a positive lens or a negative lens. By setting in this way, the light output angle of the laser can be greatly reduced by using the first lens with a smaller R value, the laser angle is compressed, and the radiation intensity of the laser is greatly improved. For the first lens with a larger zoom range, the laser after the angle is compressed can effectively reduce the effective size of the zoom lens 30 and the second fixed lens group 40, so that the size of the entire zoom lens is controlled within a very small range.

[0034] In one embodiment, the first lens is a glass lens with lower cost.

[0035] The number of the variable magnification lenses 30 may be one or more. In one embodiment, the number of the variable magnification lenses 30 is one, the optical focal length of the variable magnification lenses 30 is a negative value, and the variable magnification lenses 30 are positive lenses or negative lenses. The variable magnification lenses 30 have an extreme position near the first fixed lens group 20, defined as position 1, and the variable magnification lenses 30 have another extreme position near the second fixed lens group 40, defined as position 2. The variable magnification lens 30 group can be continuously moved between position 1 and position 2 along the laser propagation direction under the traction of the traction mechanism. When the traction mechanism is no longer traction, the second fixed lens group 40 can be stably maintained at the final position without change.

[0036] By continuously changing the magnification lens 30 between position 1 and position 2, the focal length of the zoom lens can be continuously changed between a maximum value and a minimum value. The light output angle can be adjusted to a minimum value to facilitate the camera to observe the farthest distance, or the light output angle can be adjusted to a maximum value to facilitate the camera to observe the shortest distance.

[0037] In one embodiment, the second fixed lens group 40 includes at least one second lens, the optical power of the second lens is positive, and the second lens is an aspherical curved lens. The use of an aspherical curved lens second lens can make the zoom lens have a better balance for various aberrations. It can also effectively reduce the number of lenses, and still achieve a better zoom effect when using fewer lenses.

[0038] In one embodiment, the light output angle of the first fixed lens group 20 is ≤12°, and the refractive index of the first fixed lens group 20 is: 2.0≥Nd1≥1.8, wherein Nd1 is the refractive index of the first fixed lens group 20, which is beneficial to further reduce the number of lenses and has a large zoom range.

[0039] In one embodiment, the light output angle of the variable magnification lens 30 is 50° to 130°, and the refractive index of the variable magnification lens 30 is: 2.1≥Nd2≥1.75, wherein Nd2 is the refractive index of the variable magnification lens 30, which is beneficial to further reduce the number of lenses and has a large zoom range.

[0040] In one embodiment, the light output angle of the second fixed lens group 40 is 2° to 70°, and the refractive index of the second fixed lens group 40 is: 2.0≥Nd3≥1.8, wherein Nd3 is the refractive index of the second fixed lens group 40, which is beneficial to further reduce the number of lenses and has a large zoom range.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Under the idea of ​​the present disclosure, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present disclosure as described above, which are not provided in detail for the sake of simplicity. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in each of the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of each embodiment of the present disclosure.

Claims

1. A zoom lens, characterized in that: It includes a housing, a light source, a first fixed lens group, a variable-power lens, a second fixed lens group and a traction mechanism; The light source, the first fixed lens group, the magnification lens and the second fixed lens group are arranged on the shell, the light source is used to emit laser, and along the propagation direction of the laser, the light source, the first fixed lens group, the magnification lens and the second fixed lens group are arranged in sequence, the first fixed lens group and the second fixed lens group are fixedly arranged, and the traction mechanism is connected to the magnification lens in a transmission manner to drive the magnification lens to move between the first fixed lens group and the second fixed lens group.

2. The zoom lens according to claim 1, wherein: The first fixed lens group includes at least one first lens, the optical power of the first lens is a positive value, and the first lens is a positive lens or a negative lens.

3. The zoom lens according to claim 2, wherein: The first lens is a glass lens.

4. The zoom lens according to claim 1, wherein: The number of the variable magnification lens is one, the optical focal length of the variable magnification lens is a negative value, and the variable magnification lens is a positive lens or a negative lens.

5. The zoom lens according to claim 1, wherein: The second fixed lens group includes at least one second lens, the optical power of the second lens is a positive value, and the second lens is an aspherical curved lens.

6. The zoom lens according to claim 1, wherein: The light output angle of the first fixed lens group is ≤12°, and the refractive index of the first fixed lens group is: 2.0≥Nd1≥1.8, wherein Nd1 is the refractive index of the first fixed lens group.

7. The zoom lens according to claim 1, wherein: The light output angle of the variable magnification lens is 50° to 130°, and the refractive index of the variable magnification lens is: 2.1≥Nd2≥1.75, wherein Nd2 is the refractive index of the variable magnification lens.

8. The zoom lens according to claim 1, wherein: The light output angle of the second fixed lens group is 2° to 70°, and the refractive index of the second fixed lens group is: 2.0≥Nd3≥1.8, wherein Nd3 is the refractive index of the second fixed lens group.

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