Variable magnification illumination lens and illumination system

Abstract

The application discloses a zooming illumination lens and an illumination system, wherein the zooming illumination lens comprises a lens assembly and a driving device; the lens assembly comprises a plurality of lens groups which are composed of a plurality of lenses; the lens groups are sequentially arranged from a light emitting side to a light source in an optical axis direction and comprise a fixed lens group, a zooming lens group and a compensation lens group; the driving device drives the zooming lens group and the compensation lens group to change the interval between the adjacent lens groups and the interval between the compensation lens group and the light source to realize zooming; wherein the minimum focal length of the zooming illumination lens is Fw, the maximum focal length is Ft, and Ft / Fw is less than or equal to 104; the total optical length of the zooming illumination lens is TTL, and TTL is less than or equal to 140 mm. The application aims to provide a zooming illumination lens with simple form and large zooming ratio.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to a variable magnification lighting lens and a lighting system. Background Art

[0002] Due to the increasing demand for long-distance lighting in daily life and military fields in recent years, ordinary LED lighting is not effective at distances above 150m. Lasers are more suitable as long-distance lighting sources due to their good directionality and small size.

[0003] In order to effectively utilize the laser output beam and make its illumination angle continuously adjustable within a certain range according to the requirements of use, the laser output light is usually output through optical fiber coupling and shaping. The optical fiber output light is then expanded through an optical system to make the final output beam angle adjustable and to achieve uniformity of the output beam, ultimately obtaining a uniform illumination spot on the surface of the object. Therefore, in order to meet the lighting needs, it is urgent to design and develop a zoom lens with a large zoom ratio for laser lighting. Summary of the Invention

[0004] The main purpose of the present invention is to provide a variable magnification lighting lens and a lighting system, aiming to provide a variable magnification lighting lens with a simple form and a large magnification ratio.

[0005] To achieve the above objectives, the present invention provides a variable magnification lighting lens, wherein the variable magnification lighting lens includes a lens assembly and a driving device, the lens assembly includes a plurality of lens groups composed of a plurality of lenses, and the plurality of lens groups include a fixed lens group, a variable magnification lens group, and a compensation lens group in order from the light output side to the light source in the optical axis direction;

[0006] The driving device drives the connected magnification lens group and the compensating lens group to change the interval between adjacent lens groups and the interval between the compensating lens group and the light source to achieve magnification change;

[0007] Wherein, the minimum focal length of the variable magnification lighting lens is Fw, and the maximum focal length is Ft, then Ft / Fw≤104;

[0008] The total optical length of the variable magnification lighting lens is TTL, and TTL is ≤ 140 mm.

[0009] Optionally, the movable distance of the variable magnification lens group in the optical axis direction is A, then A≤61.781mm; and / or,

[0010] The movable distance of the compensation lens group in the optical axis direction is B, and B≤12.481 mm.

[0011] Optionally, the fixed lens group includes a first lens, a second lens and a third lens arranged in sequence from the light exit side to the light source; and / or,

[0012] The zoom lens assembly includes a fourth lens and a fifth lens arranged in sequence from the light exit side to the light source; and / or,

[0013] The compensation lens group includes a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, which are sequentially arranged from the light exit side to the light source.

[0014] Optionally, each of the lenses has a light-entry surface and a light-exit surface opposite to each other;

[0015] The center distance between the light entrance surface of the third lens and the light exit surface of the fourth lens is L1, then 9.448mm≤L1≤71.229mm; and / or,

[0016] The center distance between the light entrance surface of the fifth lens and the light exit surface of the sixth lens is L2, then 2.569mm≤L2≤76.768mm; and / or,

[0017] The distance between the tenth lens and the light source is L3, then 0.934 mm + C ≤ L3 ≤ 13.352 mm + C, where C is the protection distance.

[0018] Optionally, C≤2.7mm.

[0019] Optionally, the first lens has negative optical power, the second lens has positive optical power, and the third lens has positive optical power; and / or,

[0020] The fourth lens has negative optical power, and the fifth lens has negative optical power; and / or,

[0021] The sixth lens has positive refractive power, the seventh lens has negative refractive power, the eighth lens has positive refractive power, the ninth lens has negative refractive power, and the tenth lens has positive refractive power.

[0022] Optionally, the optical power of the first lens is φ1, then -0.0066≤φ1≤-0.0060; and / or,

[0023] The optical power of the fourth lens is φ2, then -0.033≤φ2≤-0.030; and / or,

[0024] The refractive power of the sixth lens is φ3, then 0.070≤φ3≤0.080.

[0025] Optionally, the plurality of lenses are all configured as spherical lenses.

[0026] The present invention also provides a lighting system, wherein the lighting system includes a variable-magnification lighting lens and a light source, the variable-magnification lighting lens including a lens assembly and a driving device, the lens assembly including a plurality of lens groups composed of a plurality of lenses, the plurality of lens groups including a fixed lens group, a variable-magnification lens group, and a compensating lens group in order from the light-emitting side to the light source along the optical axis; the driving device achieves variable magnification by driving the variable-magnification lens group and the compensating lens group to change the spacing between adjacent lens groups and the spacing between the compensating lens group and the light source; wherein the minimum focal length of the variable-magnification lighting lens is Fw, and the maximum focal length is Ft, such that Ft / Fw ≤ 104; the total optical length of the variable-magnification lighting lens is TTL, and TTL ≤ 140 mm. The light source is disposed on the light-incident side of the variable-magnification lighting lens.

[0027] Optionally, the light source is formed by coupling RGB three-color lasers.

[0028] In the technical solution of the present invention, the fixed lens group, the variable magnification lens group and the compensating lens group are arranged in sequence from the light-emitting side to the light-incoming side in the optical axis direction of the variable magnification lighting lens, that is, in the direction of the light source. The variable magnification lens group and the compensating lens group can move along the optical axis direction under the drive of the driving device, that is, the variable magnification lens group and the compensating lens group can move relative to each other, specifically, they can move relative to each other, that is, they can move closer to or away from each other, so that the focal length of the entire lens assembly can be adjusted. It can be understood that the variable magnification lens group mainly plays the role of variable magnification and can The lens assembly can realize continuous zooming, and the compensating lens group mainly plays a compensating role. It can compensate the outgoing light during the continuous zooming of the lens assembly, thereby ensuring the outgoing light quality during the continuous zooming of the lens assembly. Under the cooperation of the zoom lens group and the compensating lens group, the uniformity of the outgoing light illumination during the high zoom ratio adjustment process can be guaranteed, that is, the uniform illumination of the targets from wide-angle and large field of view to narrow field of view and long distance under 104x magnification is maintained, and the volume of the lens is reduced to ensure that the total optical length of the zoom lighting lens does not exceed 140mm. That is, in this solution, the lens assembly composed of the fixed lens group, the magnification lens group and the compensation lens group has a simple and compact structure, a small total volume, a large magnification ratio, and can take into account both athermalization and achromatic design within the spectral range. In the actual focusing process, the driving device can be used to change the positions of the fixed-focus magnification lens group and the compensation lens group in the optical axis direction of the magnification lighting lens to achieve the zoom purpose of the lens assembly. Optical zoom is adopted throughout the process, the zooming is smooth and rotation-free, and the light spot illumination is uniform, meeting the needs of large-magnification magnification lighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] Figure 1 A schematic plan view of an embodiment of the lighting system provided by the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the adjustment of the zoom lighting lens in different states.

[0032] Description of Figure Numbers:

[0033] Label name Label name 1000 Lighting system 122 Fifth lens 100 Zoom lighting lens 13 Compensating lens group 1 lens assembly 131 Sixth lens 11 Fixed lens group 132 Seventh lens 111 First lens 133 Eighth lens 112 Second lens 134 Ninth lens 113 The third lens 135 Tenth lens 12 Zoom lens set 200 light source 121 Fourth lens

[0034] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] Due to the increasing demand for long-distance lighting in daily life and military fields in recent years, ordinary LED lighting is not effective at distances above 150m. Lasers are more suitable as long-distance lighting sources due to their good directionality and small size.

[0039] In order to effectively utilize the laser output beam and make its illumination angle continuously adjustable within a certain range according to the requirements of use, the laser output light is usually output through optical fiber coupling and shaping. The optical fiber output light is then expanded through an optical system to make the final output beam angle adjustable and to achieve uniformity of the output beam, ultimately obtaining a uniform illumination spot on the surface of the object. Therefore, in order to meet the lighting needs, it is urgent to design and develop a zoom lens with a large zoom ratio for laser lighting.

[0040] In view of this, the present invention provides a variable magnification lighting lens that can achieve effective and uniform lighting from 5m to 5000m. Figures 1 to 2 The embodiment of the variable magnification lighting lens provided by the present invention will be described below with reference to specific drawings.

[0041] See also Figures 1 to 2 The variable magnification lighting lens 100 includes a lens assembly 1 and a driving device. The lens assembly 1 includes a plurality of lens groups composed of a plurality of lenses. The plurality of lens groups include a fixed lens group 11, a variable magnification lens group 12 and a compensation lens group 13 in sequence from the light-emitting side to the light source 200 in the optical axis direction; the driving device drives the connection between the variable magnification lens group 12 and the compensation lens group to change the interval between adjacent lens groups and the interval between the compensation lens group 13 and the light source 200 to achieve magnification; wherein, the minimum focal length of the variable magnification lighting lens 100 is Fw, the maximum focal length is Ft, and Ft / Fw≤104; the total optical length of the variable magnification lighting lens 100 is TTL, and TTL≤140mm.

[0042] In the technical solution of the present invention, the fixed lens group 11, the variable magnification lens group 12 and the compensating lens group 13 are arranged in sequence from the light-emitting side to the light-incoming side in the optical axis direction of the variable magnification lighting lens 100, that is, in the direction of the light source 200. The variable magnification lens group 12 and the compensating lens group 13 can be driven by the driving device to move along the optical axis direction, that is, the variable magnification lens group 12 and the compensating lens group 13 can move relative to each other, specifically, they can move relative to each other, that is, they can move closer to or away from each other, so that the focal length of the lens assembly 1 as a whole can be adjusted. It can be understood that the variable magnification lens group 12 mainly bears the function of variable magnification. The zoom lens group 12 and the compensating lens group 13 can realize the continuous zoom of the lens assembly 1. The compensating lens group 13 mainly plays the role of compensation. It can compensate the outgoing light during the continuous zoom of the lens assembly 1, thereby ensuring the outgoing light quality of the lens assembly 1 during continuous zoom. Under the cooperation of the zoom lens group 12 and the compensating lens group 13, the uniformity of the outgoing light illumination during the high zoom ratio adjustment process can be guaranteed, that is, the uniform illumination of the targets from wide-angle and large field of view to narrow field of view and long distance is maintained under 104 times magnification, and the volume of the lens is reduced to ensure that the total optical length of the zoom lighting lens 100 does not exceed 140mm. That is, in this solution, the lens assembly 1 composed of the fixed lens group 11, the zoom lens group 12 and the compensation lens group 13 has a simple and compact structure, a small total volume, a large zoom ratio, and can take into account both athermalization and achromatic design within the spectral range. In the actual focusing process, the driving device can be used to change the positions of the fixed-focus zoom lens group 12 and the compensation lens group 13 in the optical axis direction of the zoom lighting lens 100 to achieve the zoom purpose of the lens assembly 1. Optical zoom is adopted throughout the process, the zooming is smooth and rotation-free, and the light spot illumination is uniform, which meets the needs of large-magnification zoom lighting.

[0043] In addition, the movable distance of the zoom lens group 12 in the optical axis direction is A, then A≤61.781mm; and / or, the movable distance of the compensating lens group 13 in the optical axis direction is B, then B≤12.481mm. On the basis that the total optical length of the zoom lighting lens 100 does not exceed 140mm, the movable distances of the zoom lens group 12 and the compensating lens group 13 in the optical axis direction are limited. Specifically, in this embodiment, on the basis of satisfying the zoom ratio, the movable distance of the zoom lens group 12 is limited to no more than 61.781mm, and the movable distance of the compensating lens group 13 is limited to no more than 12.481, and the zoom lens group 12 and the compensating lens group 13 are adjusted synchronously, that is, in particular, the zoom lens group 12 and the compensating lens group 13 are relatively far away from each other and can reach the far end of their movable travel at the same time, and are relatively close to each other and can reach the near end of their movable travel at the same time. For details, please refer to Figure 2The adjustment track of the zoom lens group 12 and the compensation lens group 13 is to meet the requirements of continuous zoom and the control of light transmission quality during continuous zoom. Specifically, Figure 2 The WIDE state is the state in which the focal length of the zoom lighting lens 100 is the smallest and the field of view is the largest; the TELE state is the state in which the focal length of the zoom lighting lens 100 is the largest and the field of view is the smallest; and the MID state is the intermediate state of the adjustment of the zoom lighting lens 100.

[0044] Specifically, the fixed lens includes a first lens 111, a second lens 112, and a third lens 113 arranged in sequence from the light exit side to the light source 200; and / or the variable power lens group 12 includes a fourth lens 121 and a fifth lens 122 arranged in sequence from the light exit side to the light source 200; and / or the compensating lens group 13 includes a sixth lens 131, a seventh lens 132, an eighth lens 133, a ninth lens 134, and a tenth lens 135 arranged in sequence from the light exit side to the light source 200. The number of the lenses is mainly determined to meet the requirements of the above functions and is not limited here. In this embodiment, the lens assembly 1 includes the first lens 111 to the tenth lens 135 arranged in sequence from the light exit side to the light source 200, the first lens 111 to the third lens 113 constitute the fixed lens group 11, the fourth lens 121 to the fifth lens 122 constitute the variable power lens group 12, and the sixth lens 131 to the tenth lens 135 constitute the compensating lens group 13.

[0045] Specifically, the first lens 111 has negative optical focal power, the second lens 112 has positive optical focal power, and the third lens 113 has positive optical focal power; and / or, the fourth lens 121 has negative optical focal power, and the fifth lens 122 has negative optical focal power; and / or, the sixth lens 131 has positive optical focal power, the seventh lens 132 has negative optical focal power, the eighth lens 133 has positive optical focal power, the ninth lens 134 has negative optical focal power, and the tenth lens 135 has positive optical focal power.

[0046] Furthermore, the first lens 111 is located on the light-exiting side of the fixed lens group 11, the fourth lens 121 is located on the light-exiting side of the variable-magnification lens group 12, and the sixth lens 131 is located on the light-exiting side of the compensation lens group 13. The optical focal length of the first lens 111 is φ1, then -0.0066≤φ1≤-0.0060; and / or, the optical focal length of the fourth lens 121 is φ2, then -0.033≤φ2≤-0.030; and / or, the optical focal length of the sixth lens 131 is φ3, then 0.070≤φ3≤0.080.

[0047] Specifically, please refer to Tables 1 and 2 below. Tables 1 and 2 provide specific data for implementing the variable magnification lighting lens 100 described in this embodiment.

[0048] As shown in Table 1, the data in the table is a set of data of the variable magnification lighting lens 100, including the surface number, surface shape, radius, thickness and optical material; the positive and negative signs of the radius meet the basic optical sign rules; the optical material data includes the refractive index and Abbe number of the material.

[0049] As shown in Table 2, the values ​​of the variable parameters D6, D10, and D21 in Table 1 under different states include the above-mentioned WIDE state, the values ​​of the above-mentioned variable parameters when the zoom lighting lens 100 is at the minimum focal length; the above-mentioned TELE state, the values ​​of the above-mentioned variable parameters when the zoom lighting lens 100 is at the maximum focal length; and the above-mentioned MID state, the values ​​of the above-mentioned variable parameters when the zoom lighting lens 100 is in an intermediate adjustment state.

[0050] Table 1

[0051] Face number Face shape Radius / mm Thickness / mm Refractive index Abbe number S1 standard 146.28 3.5 1.65 33.9 S2 standard 58.653 2.3 S3 standard 68.838 11.9 1.65 62.4 S4 standard Infinity 0.1 S5 standard 46.837 14.17 1.50 81.6 S6 standard 200.280 D6 S7 standard Infinity 0.7 1.81 25.5 S8 standard 25.913 0.9 S9 standard -16.430 0.9 1.90 31.3 S10 standard 12.562 D10 S11 standard Infinity -0.6 S12 standard 14.354 3.3 1.59 61.3 S13 standard -12.354 1.1 S14 standard -9.359 1.0 1.78 25.7 S15 standard -22.956 0.1 S16 standard 10.177 4.8 1.57 71.5 S17 standard -11.365 0.13 S18 standard -9.869 0.6 1.72 29.5 S19 standard 10.032 3.15 S20 standard 12.733 2.1 1.95 17.9 S21 standard Infinity D21 S22 standard Infinity 2.7

[0052] Table 2

[0053] Wide MID TELE D6 9.448 58.027 71.229 D10 76.768 24.466 2.569 D21 0.934 4.507 13.352

[0054] Furthermore, each lens has a light-entry surface and a light-exit surface relative to each other; the center distance between the light-entry surface of the third lens 113 and the light-exit surface of the fourth lens 121 is L1, then 9.448 mm ≤ L1 ≤ 71.229 mm; and / or the center distance between the light-entry surface of the fifth lens 122 and the light-exit surface of the sixth lens 131 is L2, then 2.569 mm ≤ L2 ≤ 76.768 mm; and / or the distance between the tenth lens 135 and the light source 200 is L3, then 0.934 mm + C ≤ L3 ≤ 13.352 mm + C, where C is the protection distance and C ≤ 2.7 mm. Specifically, referring to Table 1, L1 is D6 in Table 1, L2 is D10 in Table 1, and L3 is the sum of D21 in Table 1 and the protection distance C. The protection distance is mainly set to prevent the compensation lens group 13 from being too close to or even colliding with the light source 200 during the adjustment process, which may affect the use effect or even cause damage. It can also be used as back focus compensation during the lens adjustment process to reduce the impact of assembly tolerances on the uniformity of the lens output light spot. The specific setting value is based on the total optical length of the variable magnification lighting lens 100. After the optical lengths of various parts of the lens assembly 1 are set, the protection distance C is set to supplement it. Rounding is convenient for the structural size setting of the variable magnification lighting lens 100, and a fine-tuning device is reserved during the structural design, so that the light source 200 can be fine-tuned back and forth along the optical axis within the protection distance during the actual adjustment process to achieve the best lighting effect.

[0055] In addition, in this embodiment, the lenses in the lens assembly 1 are all spherical lenses, which is convenient for lens processing and has low cost and is easy to promote.

[0056] The present invention also provides an illumination system 1000, comprising a variable-magnification illumination lens 100 and a light source 200. The specific structure of the variable-magnification illumination lens 100 is similar to that of the aforementioned embodiments. Because the illumination system 1000 utilizes all of the technical solutions of all of the aforementioned embodiments, it possesses at least all of the beneficial effects provided by the technical solutions of the aforementioned embodiments, which will not be detailed here. Specifically, the illumination system 1000 can be used within a temperature range of -40°C to 70°C, and does not require refocusing when the ambient temperature changes.

[0057] Specifically, the light source 200 is formed by coupling RGB three-color lasers, and the system adopts an achromatic design so that there is no obvious color difference during the use of the lighting system 1000.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A variable magnification lighting lens, characterized in that: The lens assembly comprises a plurality of lens groups composed of a plurality of lenses and a driving device. The plurality of lens groups comprise a fixed lens group, a variable magnification lens group and a compensation lens group in sequence from the light emitting side to the light source in the optical axis direction. The driving device drives the connected magnification lens group and the compensation lens group to change the interval between adjacent lens groups and the interval between the compensation lens group and the light source to achieve magnification change; Wherein, the minimum focal length of the variable magnification lighting lens is Fw, and the maximum focal length is Ft, then Ft / Fw≤104; The total optical length of the zoom lighting lens is TTL, TTL≤140mm; The fixed lens group includes a first lens, a second lens, and a third lens arranged in sequence from the light exit side to the light source; and / or the variable magnification lens group includes a fourth lens and a fifth lens arranged in sequence from the light exit side to the light source; and / or the compensation lens group includes a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged in sequence from the light exit side to the light source; The first lens has negative optical power, the second lens has positive optical power, and the third lens has positive optical power; and / or the fourth lens has negative optical power, and the fifth lens has negative optical power; and / or the sixth lens has positive optical power, the seventh lens has negative optical power, the eighth lens has positive optical power, the ninth lens has negative optical power, and the tenth lens has positive optical power; The focal power of the first lens is φ1, then -0.0066≤φ1≤-0.0060; and / or, the focal power of the fourth lens is φ2, then -0.033≤φ2≤-0.030; and / or, the focal power of the sixth lens is φ3, then 0.070≤φ3≤0.

080.

2. The variable magnification lighting lens according to claim 1, wherein: Each of the lenses has a light-entry surface and a light-exit surface opposite to each other; The center distance between the light entrance surface of the third lens and the light exit surface of the fourth lens is L1, then 9.448mm≤L1≤71.229mm; and / or, The center distance between the light entrance surface of the fifth lens and the light exit surface of the sixth lens is L2, then 2.569mm≤L2≤76.768mm; and / or, The distance between the tenth lens and the light source is L3, then 0.934mm+C≤L3≤13.352mm+C, where C is the protection distance.

3. The variable magnification lighting lens according to claim 2, wherein: C≤2.7mm.

4. The variable magnification lighting lens according to claim 1, wherein: The plurality of lenses are all configured as spherical lenses.

5. A lighting system, characterized in that: include: A variable-magnification lighting lens, which is the variable-magnification lighting lens according to any one of claims 1 to 4; as well as, The light source is arranged on the light incident side of the zoom lighting lens.

6. The lighting system according to claim 5, wherein The light source is formed by coupling RGB three-color lasers.

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