CN217133478U - Light receiving system - Google Patents
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- CN217133478U CN217133478U CN202221110761.9U CN202221110761U CN217133478U CN 217133478 U CN217133478 U CN 217133478U CN 202221110761 U CN202221110761 U CN 202221110761U CN 217133478 U CN217133478 U CN 217133478U
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Abstract
The utility model discloses a light receiving system, which comprises a luminous source, a first lens, a second lens and a third lens which are arranged on the light emitting path of the luminous source in sequence and are coaxially arranged; the focal lengths of the first lens, the second lens and the third lens are respectively f1, f2 and f3, the combined focal length is f, f1, f2 and f3 are all larger than 0, the farthest distance from the light emitting surface of the light emitting source to the light emitting surface of the third lens is L, and L and f meet the following conditions: l/f is more than 1.52 and less than 1.88; the effective clear aperture of the first lens is D1, the gap distance between the luminous surface of the luminous source and the first lens is L1, and the D1 and the L1 satisfy: 7< D1/L1< 11; the third lens is an aspheric lens. Receive optical system can compromise big numerical aperture, high rate of receiving light and little formation of image difference, receive optical system's formation of image optical system aberration correction degree height, optical effect is excellent.
Description
Technical Field
The utility model relates to the field of optical technology, more specifically relates to a receive optical system
Background
The application of laser excited fluorescent powder, LED, EEL, VCSEL and fiber coupled laser light sources basically needs to use a light receiving module to better utilize the light sources. Particularly, for an LED or a phosphor sheet excited by laser, light is emitted from a plane with an angle of 180 degrees, and the luminance is low, and a light receiving module with a large Numerical Aperture (NA) is required to receive light to meet the luminance requirement. The numerical aperture is the product of the refractive index (n) of the medium between the lens and the object to be inspected and the sine of half the aperture angle (2 α), and is formulated as follows: NA nd sin α. The aperture angle, also called the "mirror opening angle", is the angle formed by the object point on the optical axis of the lens and the effective diameter of the objective lens front lens. The larger the aperture angle, the greater the light flux entering the lens, which is proportional to the effective diameter of the lens and inversely proportional to the distance of the focal points. The numerical aperture is an important parameter for determining the performance of the optical module. The larger the NA, the more light energy is collected, and when NA is 1, it indicates that there is no loss of collected energy. Numerical aperture NA of most module collimation modules is at 0.7 in the market today, and it is rare that it is true that NA exceeds 0.8, and NA exceeds 0.9 and has not reported yet at present, and the reason lies in, and NA increase, lens aberration can receive great influence, influences the imaging effect, and big NA design degree of difficulty is big.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at overcoming above-mentioned prior art's at least one defect, provide a big numerical aperture's receipts optical system, receive optical system and can compromise big numerical aperture, high rate of receiving light and little formation of image difference, the imaging optical system aberration correction degree of receiving optical system is high, and optical effect is excellent.
The utility model adopts the following technical scheme:
a light receiving system comprises a light emitting source, a first lens, a second lens and a third lens, wherein the first lens, the second lens and the third lens are sequentially arranged on a light emitting path of the light emitting source and are coaxially arranged; the focal lengths of the first lens, the second lens and the third lens are respectively f1, f2 and f3, the combined focal length is f, f1, f2 and f3 are all greater than 0, the farthest distance from the light-emitting surface of the light-emitting source to the light-emitting surface of the third lens is L, and L and f satisfy: l/f is more than 1.52 and less than 1.88; the effective clear aperture of the first lens is D1, the gap distance between the luminous surface of the luminous source and the first lens is L1, and the D1 and the L1 satisfy: 7< D1/L1< 11; the third lens is an aspheric lens.
In one embodiment, in the light propagation direction on the central axis of the phosphor, the first lens is a plano-convex lens, the light-receiving surface facing the phosphor is a plane, the light-emitting surface facing away from the light-emitting source is a convex surface, and the radius of curvature is R12;
the second lens is a biconvex lens or a concave-convex lens, the light emitting surface of the second lens facing away from the light emitting source is a convex surface, the curvature radius of the light receiving surface of the second lens facing towards the light emitting source and the curvature radius of the light emitting surface facing away from the light emitting source are respectively R21 and R22, | R22| < | R21| < | R22| 15, | R12| < | R22| < | R12| 1.7;
the third lens is a plano-convex or concave-convex aspheric lens, the light receiving surface facing the light emitting source is a plane or a concave surface, the light emitting surface facing away from the light emitting source is a convex aspheric surface, the approximate spherical curvature radius of the convex aspheric surface is R32, | R12| 0.8 < | R32| < | R12| 1.6.
In one embodiment, the effective clear apertures of the second and third lenses are D2 and D3, respectively, and the first, second and third lenses satisfy: R12/D1 is more than or equal to 1 and less than or equal to 3.5; d2/| R22| -1.84 | -1.3; R32/D3 is more than or equal to 0.34 and less than or equal to 0.75.
In one embodiment, the D1, D2 and D3 satisfy: d1< D2< D3, and 3 × D1< D3<5 × D1.
In one embodiment, the center thicknesses of the first lens and the third lens are respectively T1 and T3, and the T1 and the T3 satisfy the following conditions: t1< T3, 2.2< D3/T3< 4.4.
In one embodiment, the gap distances of the first lens and the second lens and the gap distances of the second lens and the third lens are L2 and L3, respectively, and L1, L2 and L3 satisfy: 3L 1< L2, 3L 3 ≤ L2.
In one embodiment, the first lens, the second lens and the third lens are all glass lenses, and the refractive index nd of the material used for the first lens, the second lens and the third lens satisfies that: nd is more than 1.45 and less than 1.88.
In one embodiment, the depth z of the aspheric surface of the third lens satisfies:
wherein alpha is 1 ＝α 6 ＝α 7 ＝α 8 ＝0，k＜0。
In one embodiment, the f satisfies 14mm < f <16 mm.
In one embodiment, the light emitting source is an LED, EEL, VCSEL, fiber coupled laser, or semiconductor laser.
In one embodiment, the light emitting surface of the light emitting source is a light emitting surface of the laser excitation phosphor layer. Further, the light emitting source emits blue laser with a wavelength of 440-480nm, the blue laser is collimated or focused on the fluorescent powder, a plane where the fluorescent powder is located is a light emitting surface, at least part of the blue laser is excited and converted into excited light, the excited light generates approximate lambertian scattering, the divergence angle is large, the first lens, the second lens and the third lens can efficiently collect and collimate lambertian light, the light collection rate is high, the imaging difference is small, and the optical effect is excellent.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses the lens group that uses three lens to constitute draws in, the collimation to the light of light emitting source, and the clear aperture etc. of the length of focus, combination focus, battery of lens, first lens through controlling each lens makes the numerical aperture who receives optical system big, receives the light rate high, and imaging optics system imaging difference is little simultaneously, and the aberration correction degree is high, and the gained receipts optical system of gained receives optical property and optical effect all excellence.
Drawings
Fig. 1 is a schematic view of an optical structure of the light receiving system of the present invention.
Fig. 2 is a simulation analysis point chart of the light receiving system according to embodiment 1 of the present invention.
Fig. 3 is a simulation analysis aberration diagram of the optical pickup system according to embodiment 1 of the present invention.
Fig. 4 is a simulation analysis point chart of the light receiving system according to embodiment 2 of the present invention.
Fig. 5 is a simulation analysis aberration diagram of the light receiving system according to embodiment 2 of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The utility model discloses the people discovers in the research process, and the biggest difficult point of accomplishing high receipts light efficiency and guaranteeing optical effect is to compromise big numerical aperture simultaneously and guarantee little aberration, does not see any numerical aperture optical system more than 0.9 on the market at present. In particular, for an optical system of a high-power laser light source, the light receiving rate of the lens assembly greatly affects the illuminance and the luminous flux of light, so that it is necessary to improve the light receiving rate.
Based on the above problems, the present invention is provided.
In an embodiment of the present invention, a light receiving system is provided, which includes a light emitting source, a first lens, a second lens, and a third lens, which are coaxially disposed on a light emitting path of the light emitting source; the focal lengths of the first lens, the second lens and the third lens are respectively f1, f2 and f3, the combined focal length is f, f1, f2 and f3 are all greater than 0, the farthest distance from the light-emitting surface of the light-emitting source to the light-emitting surface of the third lens is L, and L and f satisfy: l/f is more than 1.52 and less than 1.88; the effective clear aperture of the first lens is D1, the gap distance between the luminous surface of the luminous source and the first lens is L1, and the D1 and the L1 satisfy: 7< D1/L1< 11; the third lens is an aspheric lens.
The utility model provides a receive optical system includes light emitting source and 3 lens, the light emitting source is used for sending light, 3 lens are used for carrying out furthest to the light that sends and receive the light, the loss of avoiding light as far as possible guarantees optical effect, wherein, the effective clear aperture of first lens is big more, then receive optical system's numerical aperture big more, but also not in order to improve the not limited increase in effective clear aperture that numerical aperture can make first lens, still need the comprehensive consideration into aberration, the size of a dimension, space assembly nature, optics piece processing nature etc.. The second lens is used for further collecting and/or collimating the light rays received by the first lens and reducing the size of the light receiving system. The third lens uses aspherical lens can correct the aberration better, guarantee the degree of collimation, from this the utility model discloses a first lens, second lens, the combined action of third lens makes it can compromise big numerical aperture, high rate of receiving light and little imaging difference to receive optical system, it is high to receive optical system's imaging optical system aberration correction degree, and optical effect is excellent.
Further, the L and f preferably satisfy: l/f is more than or equal to 1.66 and less than or equal to 1.72.
Further, the D1 and L1 preferably satisfy: D1/L1 is more than or equal to 8 and less than or equal to 9.
In any embodiment, the first lens is a plano-convex lens, a light receiving surface facing the light-emitting source is a plane, a light emitting surface facing away from the light-emitting source is a convex surface, and a curvature radius of the light emitting surface is R12; the second lens is a biconvex lens or a concave-convex lens, the light emitting surface of the second lens back to the light emitting source is a convex surface, the curvature radius of the second lens facing the light receiving surface of the light emitting source and the curvature radius of the light emitting surface of the second lens back to the light emitting source are respectively R21 and R22, | R22| < | R21| < | R22| -15, | R12| < | R22| < | R12| -1.7; the third lens is a plano-convex or concave-convex aspheric lens, the light receiving surface facing the light emitting source is a plane or a concave surface, the light emitting surface facing away from the light emitting source is a convex aspheric surface, the approximate spherical curvature radius of the convex aspheric surface is R32, | R12| 0.8 < | R32| < | R12| 1.6. In particular, | R22| ≦ R21| ≦ R22| _ 10, | R12| _ 1.17 | ≦ R22| ≦ R12| _ 1.7, the smaller the size of the light receiving system. The curvature radiuses of the first lens, the second lens and the third lens can influence the focal length and the imaging effect of the light receiving system.
In any embodiment, the effective clear apertures of the second and third lenses are D2 and D3, respectively, and the first, second, and third lenses satisfy: R12/D1 is more than or equal to 1 and less than or equal to 3.5; d2/| R22| -1.84 | -1.3; R32/D3 is more than or equal to 0.34 and less than or equal to 0.75. Further preferably, 1.22 ≦ R12|/D1 ≦ 1.89, 1.3 ≦ D2/| R22| ≦ 1.35; R32/D3 is more than or equal to 0.4 and less than or equal to 0.6.
More specifically, the D1, D2 and D3 satisfy: d1< D2< D3, and 3 × D1< D3<5 × D1. The clear aperture of each lens influences the light-receiving angle.
In any embodiment, the first and third lenses have center thicknesses T1 and T3, respectively, and T1 and T3 satisfy: t1< T3, 2.2< D3/T3< 4.4. Further preferably, 3. ltoreq. D3/T3. ltoreq.4.
In any embodiment, the gap spacing between the first lens and the second lens and the gap spacing between the second lens and the third lens are L2 and L3, respectively, and L1, L2 and L3 satisfy: 3L 1< L2, 3L 3 ≤ L2.
In any embodiment, the first lens, the second lens and the third lens are all glass lenses, and the refractive index nd of the material used for the first lens, the second lens and the third lens satisfies the following conditions: nd is more than 1.45 and less than 1.88.
In any embodiment, the depth z of the aspheric surface of the third lens satisfies:
wherein alpha is 1 ＝α 6 ＝α 7 ＝α 8 0, k is less than 0; c is 1/R, R is curvature radius, and k is a quadric coefficient; r is height, α 1 To alpha 8 Are aspheric coefficients.
In any embodiment, the light emitting source is an LED, EEL, VCSEL, fiber coupled laser, or semiconductor laser.
In any embodiment, the light emitting surface of the light emitting source is a light emitting surface of the laser excitation phosphor layer. Furthermore, the light emitting source emits blue laser with a wavelength of 440-480nm, the blue laser is collimated or focused on the fluorescent powder, the plane where the fluorescent powder is located is the light emitting surface, at least part of the blue laser is excited and converted into excited light, the excited light generates approximate lambertian scattering, and the divergence angle is large. The first lens, the second lens and the third lens can efficiently collect and collimate Lambert-type light, and are high in light collection rate, small in imaging difference and excellent in optical effect. Further, the light emitting surface of the phosphor layer may be a light emitting surface of a fluorescent color wheel, that is, the phosphor layer covers the rotatable color wheel. Through the rotary design, under the fixed unchangeable condition of laser light source, phosphor powder stimulated emission point is changing, and laser is not shone a certain point, but shines phosphor powder with certain orbit on, and laser is similar to and stimulates phosphor powder with a circular orbit to can avoid laser only to concentrate on a bit, and then avoid burning powder.
The following is further described with reference to specific parameters.
Example 1
As shown in fig. 1, the present embodiment discloses an optical receiving system, which includes a light emitting source, a first lens 1, a second lens 2, and a third lens 3, which are coaxially disposed on a light emitting path of the light emitting source in sequence; the focal lengths of the first lens 1, the second lens 2 and the third lens 3 are respectively f1, f2 and f3, the combined focal length is f, f1, f2 and f3 are all greater than 0, the farthest distance from the light emitting surface a of the light emitting source 100 to the light emitting surface of the third lens 3 is L, and L and f satisfy: 1.52 < L/f < 1.88, the effective clear aperture of the first lens is D1, and the gap spacing between the luminous surface of the luminous source and the first lens is L1; the third lens is an aspheric lens. More specifically, in the present embodiment, f is 15mm, L is 24.9mm, D1 is 9mm, and L1 is 1 mm.
More specifically, in the present embodiment, the first lens 1 is a plano-convex lens, a light-receiving surface facing the light-emitting source is a plane, a light-emitting surface facing away from the light-emitting source is a convex surface, and a curvature radius is R12; the second lens is a biconvex lens, namely, a light receiving surface facing the light-emitting source and a light emitting surface facing away from the light-emitting source are both convex surfaces, and the curvature radius of the light receiving surface facing the light-emitting source and the curvature radius of the light emitting surface facing away from the light-emitting source of the second lens are R21 and R22 respectively; the third lens is a plano-convex aspheric lens, the light receiving surface facing the light emitting source is a plane, and the light emitting surface facing away from the light emitting source is a convex surface and is an aspheric surface. In this example, R12 ═ 17mm, R21 ═ 200mm, R22 ═ 20mm, and R32 ═ 15 mm.
Further, the effective clear apertures of the second lens and the third lens are D2 and D3, respectively, and in this embodiment, D2 is 27mm, and D3 is 31 mm.
The gap spacing of the first lens and the second lens and the gap spacing of the second lens and the third lens are respectively L2 and L3. Receive the arrangement that light system was shown according to fig. 1 from a left side to the right side, clearance interval L1 be the light emitting area of light emitting source and the first lens is towards the shortest distance on the receipts plain noodles of light emitting source, clearance interval L2 is the plain noodles that first lens is dorsad the light emitting source and the shortest distance on the receipts plain noodles that second lens is towards the light emitting source, clearance interval L3 is the plain noodles that second lens is dorsad the light emitting source and the shortest distance on the receipts plain noodles that third lens is towards the light emitting source. More specifically, the present embodiment L2 is 5.1mm, and L3 is 0.3 mm.
The center thicknesses of the first lens, the second lens and the third lens are respectively T1, T2 and T3, in the embodiment, T1 is 2mm, T2 is 7.5mm and T3 is 9 mm.
In this embodiment, the depth z of the aspheric surface of the third lens satisfies:
wherein alpha is 1 ＝α 6 ＝α 7 ＝α 8 ＝0；k＜0；
α 2 ＝1.5×10 -5 ，α 3 ＝2.1×10 -8 ，α 4 ＝3.7×10 -10 ，α 5 ＝-5×10 -13 ；
c is 1/R, R is curvature radius, and k is a quadric coefficient; r is the height. Alpha is alpha 1 To alpha 8 Are aspheric coefficients.
Further, in this embodiment, the first lens, the second lens, and the third lens are all glass lenses, and the refractive index nd of the material used for the first lens, the second lens, and the third lens satisfies: nd is more than 1.45 and less than 1.88.
The light emitting source is an LED, an EEL, a VCSEL, an optical fiber coupling laser or a semiconductor laser.
The light emitting surface of the light emitting source is a light emitting surface of the laser excited fluorescent powder sheet. More specifically, in this embodiment, the light-emitting source emits a blue laser with a wavelength of 440-480nm, the blue laser is collimated or focused on the phosphor, a plane where the phosphor is located is an exit surface, at least a portion of the blue laser is excited and converted into a stimulated laser, the excited light generates an approximately lambertian scattering, the divergence angle is large, the first lens, the second lens and the third lens can efficiently collect and collimate lambertian light, the light collection efficiency is high, the imaging difference is small, and the optical effect is excellent.
In this example 1, the simulated analysis spot diagram is shown in fig. 2, and the RMS radius of the light collecting system is 2.164, which indicates that the optical system has high light spot concentration and excellent optical effect. The simulated analysis phase difference diagram of the light collecting system is shown in fig. 3, the maximum scale of which is ± 5mr, and the actual maximum scale is within the range of about ± 4mr, which shows that the optical system of the present invention has small aberration.
Based on each above-mentioned parameter of this embodiment, carry out analog computation through zemax software, obtain receive optical system's numerical aperture is 0.94, and it is 94% from this to receive the light rate, receive optical system can compromise big numerical aperture, high light rate and little imaging difference, receive optical system's imaging optical system aberration correction degree height, optical effect is excellent.
Example 2
As shown in fig. 1, this embodiment 2 discloses an optical receiving system, which includes a light emitting source, a first lens 1, a second lens 2, and a third lens 3, which are coaxially disposed on a light emitting path of the light emitting source; the focal lengths of the first lens 1, the second lens 2 and the third lens 3 are respectively f1, f2 and f3, the combined focal length is f, f1, f2 and f3 are all greater than 0, the farthest distance from the light emitting surface a of the light emitting source 100 to the light emitting surface of the third lens 3 is L, and L and f satisfy: 1.52 < L/f < 1.88, the effective clear aperture of the first lens is D1, and the gap spacing between the luminous surface of the luminous source and the first lens is L1; the third lens is an aspheric lens. In this example, f is 14.5mm, L is 25mm, D1 is 8mm, and L1 is 1 mm.
As in embodiment 1, in this embodiment, the first lens 1 is a plano-convex lens, a light-receiving surface facing the light-emitting source is a plane, a light-emitting surface facing away from the light-emitting source is a convex surface, and a curvature radius is R12; the third lens is a plano-convex aspheric lens, the light receiving surface facing the light emitting source is a plane, the light emitting surface facing away from the light emitting source is a convex aspheric surface, and the approximate spherical curvature radius of the convex aspheric surface is R32. Unlike embodiment 1, the second lens is a meniscus lens, i.e., the light-receiving surface facing the light-emitting source is concave and the light-emitting surface facing away from the light-emitting source is convex, and the radius of curvature of the light-receiving surface facing the light-emitting source and the radius of curvature of the light-emitting surface facing away from the light-emitting source of the second lens are R21 and R22, respectively. In this example, R12 ═ 9.8mm, R21 ═ 142mm, R22 ═ 16mm, and R32 ═ 15.6 mm.
The effective clear apertures of the second lens and the third lens are D2 and D3, respectively, and in this embodiment, D2 is 21mm, and D3 is 26 mm.
Further, the gap spacing of the first lens and the second lens, and the gap spacing of the second lens and the third lens are L2 and L3, respectively. Specifically, in this embodiment, L2 is 6.7mm, and L3 is 2 mm.
The center thicknesses of the first lens, the second lens and the third lens are respectively T1, T2 and T3, and in the embodiment, T1 is 2.7mm, T2 is 5.1mm and T3 is 7.5 mm.
The depth z of the aspheric surface of the third lens described in this embodiment satisfies:
wherein alpha is 1 ＝α 6 ＝α 7 ＝α 8 ＝0；k＜0；
α 2 ＝-2.1×10 -6 ，α 3 ＝-2.57×10 -7 ，α 4 ＝1.52×10 -8 ，α 5 ＝-5.3×10 -11 ；
c is 1/R, R is curvature radius, and k is a quadric coefficient; r is the height. Alpha is alpha 1 To alpha 8 Are aspheric coefficients.
As in embodiment 1, the light source in this embodiment is a light source that emits a blue laser with a wavelength of 440-480nm, the blue laser is collimated or focused on the phosphor, a plane where the phosphor is located is a light emitting surface, at least a portion of the blue laser is excited and converted into a stimulated laser, the excited light generates an approximately lambertian scattering, the divergence angle is large, the first lens, the second lens and the third lens can efficiently collect and collimate lambertian light, the light collection efficiency is high, the imaging difference is small, and the optical effect is excellent.
In this example 2, the simulated analysis spot diagram is shown in fig. 4, and the RMS radius of the light collecting system is 6.543, which indicates that the optical system has high light spot concentration and excellent optical effect. Fig. 5 shows a simulated analysis phase difference diagram of the optical system, in which the maximum scale is ± 10mr, and the actual range is about ± 6mr, which shows that the optical system of the present invention has small aberration (although it is not as good as in embodiment 1, the effect is still better).
Based on the above parameters of this embodiment, through performing simulation calculation by zemax software, the numerical aperture of the light receiving system is 0.92, and the light receiving rate is 92%. Therefore, it can be known that receive optical system can compromise big numerical aperture, high rate of receiving light and little formation of image difference, receive optical system's formation of image optical system aberration correction degree height, optical effect is excellent.
To sum up, receive optical system and receive light efficiently, numerical aperture is not less than 0.9, receives the light rate and is not less than 90%.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not limitations to the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (10)
1. The light receiving system is characterized by comprising a light emitting source, a first lens, a second lens and a third lens, wherein the first lens, the second lens and the third lens are coaxially arranged on a light emitting path of the light emitting source in sequence; the focal lengths of the first lens, the second lens and the third lens are respectively f1, f2 and f3, the combined focal length is f, f1, f2 and f3 are all greater than 0, the farthest distance from the light-emitting surface of the light-emitting source to the light-emitting surface of the third lens is L, and L and f satisfy: l/f is more than 1.52 and less than 1.88; the effective clear aperture of the first lens is D1, the gap distance between the luminous surface of the luminous source and the first lens is L1, and the D1 and the L1 satisfy: 7< D1/L1< 11; the third lens is an aspheric lens.
2. The light collecting system of claim 1, wherein the first lens is a plano-convex lens, the light collecting surface facing the light emitting source is a plane, the light emitting surface facing away from the light emitting source is a convex surface, and the radius of curvature of the light emitting surface is R12;
the second lens is a biconvex lens or a concave-convex lens, the light emitting surface of the second lens back to the light emitting source is a convex surface, the curvature radius of the second lens facing the light receiving surface of the light emitting source and the curvature radius of the light emitting surface of the second lens back to the light emitting source are respectively R21 and R22, | R22| < | R21| < | R22| -15, | R12| < | R22| < | R12| -1.7;
the third lens is a plano-convex or concave-convex aspheric lens, the light receiving surface facing the light emitting source is a plane or a concave surface, the light emitting surface facing away from the light emitting source is a convex aspheric surface, the approximate spherical curvature radius of the convex aspheric surface is R32, | R12| 0.8 < | R32| < | R12| 1.6.
3. The light collecting system as claimed in claim 2, wherein the effective clear apertures of the second and third lenses are D2 and D3, respectively, and the first, second and third lenses satisfy: R12/D1 is more than or equal to 1 and less than or equal to 3.5; d2/| R22| -1.84 | -1.3; R32/D3 is more than or equal to 0.34 and less than or equal to 0.75.
4. The light collecting system as claimed in claim 3, wherein D1, D2 and D3 satisfy: d1< D2< D3, and 3 × D1< D3<5 × D1.
5. The light collecting system of claim 3, wherein the first lens and the third lens have center thicknesses of T1 and T3, respectively, and the T1 and the T3 satisfy the following conditions: t1< T3, 2.2< D3/T3< 4.4.
6. The light collecting system of claim 1, wherein the gap distance between the first lens and the second lens and the gap distance between the second lens and the third lens are L2 and L3, respectively, and the L1, the L2 and the L3 satisfy: 3L 1< L2, 3L 3 ≤ L2.
7. The light collecting system of claim 1, wherein the first lens, the second lens and the third lens are all glass lenses, and the refractive index nd of the material used for the first lens, the second lens and the third lens satisfies: nd is more than 1.45 and less than 1.88.
8. The light collecting system as claimed in claim 1, wherein the depth z of the aspheric surface of the third lens satisfies:
wherein alpha is 1 ＝α 6 ＝α 7 ＝α 8 0, k is less than 0; c is 1/R, R is curvature radius, and k is a quadric coefficient; r is height, α 1 To alpha 8 Are aspheric coefficients.
9. A light receiving system according to any one of claims 1 to 8, wherein the light emitting source is an LED, EEL, VCSEL, fiber coupled laser or semiconductor laser.
10. The light collecting system of any one of claims 1 to 8, wherein the light emitting surface of the light emitting source is a light emitting surface of a laser-excited phosphor layer.
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| CN202221110761.9U CN217133478U (en) | 2022-05-10 | 2022-05-10 | Light receiving system |
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| CN202221110761.9U CN217133478U (en) | 2022-05-10 | 2022-05-10 | Light receiving system |
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