Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B13/00—Optical objectives specially designed for the purposes specified below
  • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
  • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
  • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
  • G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses

Definitions

• the present invention relates to an imaging optical system for a lens, and more particularly to a miniature high quality, low tolerance sensitivity lens composed of three aspherical lenses. Background technique
• the miniature camera lens has been researched and developed in the prior art, and in particular, the camera lens of the three-lens structure has been rapidly developed. However, how to design its specific structural parameters to achieve better optical effects has always been a major problem in the optical lens manufacturing industry.
• the high quality of the camera lens is achieved by one or more aspherical lenses. Since the aspheric lens has a good radius of curvature, it can maintain good aberration correction and improve the camera lens.
• the overall resolution and quality, but this design is also easy to lead to lower tolerance tolerance, high lens processing requirements, and can not be stable in mass production. In contrast, most of the products that have been disclosed with better tolerance tolerances have poorer image quality.
• the optical lens disclosed in Chinese Patent No. 200510035220.9 is an optical system composed of three lenses.
• the three lenses in the lens are positively refracting biconvex first lenses from the object side to the image side, and the negative diopter concave and convex surfaces are Two lenses, a convex and concave third lens of negative diopter.
• This patent although the third lens has better tolerance tolerance, the lens eccentricity tolerance is 5 ⁇ ⁇ , but the first lens The eccentricity tolerance is 2 ⁇ ⁇ , and the eccentricity tolerance of the second lens is 2 ⁇ ⁇ . Therefore, the precision of processing and manufacturing is very high, and there are certain difficulties.
• Figure 1 is a Monte Carlo yield analysis of the patented product. It can be seen from the figure that its yield is only 77% at 1/2 Nyquist frequency.
• the present invention proposes an optical lens structure, which adopts an aspherical lens combination method and a specific optical parameter design, and effectively solves the shortcomings of the current lens that cannot achieve both high quality and low sensitivity.
• the present invention provides a high-quality, low-sensitivity miniature camera lens in order to overcome the deficiencies of the prior art, and the specific technical solution is as follows:
• the miniature imaging lens of the present invention comprises three aspherical lenses and an aperture, wherein the three aspherical lenses are, in order from the object side to the image side, a first lens, a second lens and a third lens, respectively, and the diopter of each lens is Positive, negative, positive, wherein the lens satisfies the following expression:
• VP1 and VP2 are the Abbe numbers of the first lens and the second lens, respectively.
• a preferred structure is that the diaphragm is disposed between the first lens and the second lens.
• a preferred structure is that the lens satisfies the following relationship:
• fl is the focal length of the first lens
• f is the focal length of the second lens
• P1R1 is the radius of curvature of the first lens object side
• P1R2 is the radius of curvature of the first lens image side
• P2R2 is the radius of curvature of the second lens image side. Further, the preferred structure is
• the first lens is a meniscus lens
• the second lens is a meniscus lens
• the third lens is an arcuate lens.
• the convex surface of the first lens faces the object side
• the central convex surface of the third lens faces the object side.
• the lens satisfies the following expression:
• P1R1 is the radius of curvature of the first lens object side
• P1R2 is the radius of curvature of the first lens image side.
• the miniature imaging lens of the invention adopts the combination of aspherical lenses, improves the resolution of the entire lens, ensures the excellent imaging quality of the lens, and at the same time, makes the tolerance of the lens sensitive through reasonable optical parameter design.
• the lower degree ensures the mass production of the product during production and has achieved good technical results.
• FIG. 1 is a Monte Carlo yield analysis diagram of a miniature imaging lens disclosed in the prior art
• FIG. 2 is a view showing a specific configuration of a miniature imaging lens according to Embodiment 1 of the present invention
• FIG. 3 is a view showing a first embodiment of the present invention. Axis chromatic aberration diagram of the miniature camera lens;
• Figure 4 is a view showing an astigmatism diagram of a miniature imaging lens of Embodiment 1 of the present invention.
• Figure 5 is a view showing a distortion of the miniature imaging lens of Embodiment 1 of the present invention.
• FIG. 6 is a magnification chromatic aberration diagram of the micro imaging lens of Example 1 of the present invention
• Fig. 7 is a view showing a Monte Carlo yield analysis of the micro imaging lens of the first embodiment of the present invention
• Fig. 8 is a view showing a detailed configuration of the micro imaging lens of the second embodiment of the present invention
• Fig. 9 is a view showing a second embodiment of the present invention.
• Figure 10 is a view showing an astigmatism diagram of a miniature imaging lens of Embodiment 2 of the present invention.
• Figure 11 is a view showing a distortion of a miniature imaging lens of Embodiment 2 of the present invention.
• Figure 12 is a diagram showing the chromatic aberration of magnification of the miniature imaging lens of Example 2 of the present invention.
• Fig. 13 is a view showing a Monte Carlo yield analysis chart of the micro imaging lens of Example 2 of the present invention. detailed description
• the optical lens of the prior art is mainly focused on improving the imaging quality and neglecting the tolerance tolerance, and proposes a miniature imaging lens with high imaging quality and good tolerance tolerance.
• the miniature imaging lens of the present invention comprises three aspherical lenses and an aperture, and the refractive power of each lens is positive, negative and positive, wherein the lens satisfies the following expression:
• VP1 and VP2 are the Abbe numbers of the first lens and the second lens, respectively.
• the three aspherical lenses are sequentially defined as the first lens, the second lens, and the third lens from the object side to the image side.
• the chromatic aberration and vertical axis aberration can be significantly reduced, the imaging quality can be improved, and the tolerance tolerance can be improved.
• the Abbe number VP3 of the third lens in the present invention is not particularly limited, and as long as it is an aspherical lens having positive refracting power, the third lens may suitably employ any lens commonly used in the art.
• the position of the diaphragm in the present invention is not particularly limited, but is preferably disposed between the first lens and the second lens. This arrangement can reduce aberrations and improve image quality.
• the shape of the aspherical lens of the present invention is not particularly limited, and any shape such as biconvex, plano-convex, double-concave, and meniscus may be suitably employed as long as the above-described diopter and Abbe number requirements are satisfied. Shape, bow shape, etc., but from the viewpoint of improving image quality, it is preferable that the first lens is a meniscus lens, the second lens is a meniscus lens, and the third lens is an arcuate lens. Further preferably, the convex surface of the first lens faces the object side, the convex surface of the second lens faces the image side, and the central convex surface of the third lens faces the object side.
• tolerance tolerance is a relatively complicated problem, which is affected by many factors.
• the inventors have found through extensive experiments that the relationship between lens focal length and radius of curvature has a great influence on tolerance sensitivity.
• the focal length and the radius of curvature satisfy the following relationship, which can significantly reduce the tolerance of the lens and improve the tolerance of the product.
• fl is the focal length of the first lens
• F2 is the focal length of the second lens
• P1R1 is the radius of curvature of the first lens object side
• P1R2 is the radius of curvature of the first lens image side
• P2R2 is the radius of curvature of the second lens image side.
• the radius of curvature of each lens satisfies: 0.4 ⁇ (P1R2 - P1R1) / (P1R1 + P1R2) ⁇ 0.5.
• the tolerance tolerance of the lens is further improved.
• Fig. 2 is a view showing a detailed configuration of a miniature imaging lens of Embodiment 1 of the present invention.
• the miniature imaging lens includes three aspherical lenses, and, in order from the object plane to the image plane along the optical axis, is a first lens E1 having a positive refracting power, an aperture E4, and a second having a negative refracting power.
• the first lens is a meniscus-shaped convex-concave lens, the convex surface faces the object side, and the concave surface faces the image side;
• the second lens is a meniscus-shaped concave-convex lens, the concave surface faces the object side, and the convex surface faces the image side;
• the three lens is an arcuate lens of a convex-concave lens, the convex surface faces the object side, the concave surface faces the image side, and the central convex surface faces the object side.
• the aperture E4 is disposed between the first lens E1 and the second lens E2, and the aperture may be disposed at another position.
• the focal length fl of the first lens is 2.50
• the focal length f2 of the second lens is - 3.79
• the focal length f3 of the third lens is selected to be 4.53
• the focal length f of the entire lens is 2.79.
• the radius of curvature of the first lens object is P1R1 is 1.2000
• the radius of curvature P1R2 of the first lens image side is 3.4500
• the radius of curvature P2R2 of the image side of the second lens is -1.4682.
• Table 1 and Table 2 list the relevant parameters of the lens of the specific embodiment 1 of the present invention, including the surface type of the lens surface, the radius of curvature, and the thickness, material, effective diameter and conical coefficient of each lens.
• each lens is sequentially numbered, the mirror surface of the first lens E1 is S1, S2, the pupil plane is S3, the mirror surface of the second lens E2 is S4, S5, and the third lens E3
• the mirror surface is S6, S7, and the mirror surface of the filter E6 is S8, S9, and S10 is an imaging plane.
• Table 2 lists the specific parameters of the aspherical high order term coefficients A4, A6, A8, A10, A12, A14, A16 of the first lens E1, the second lens E2, and the third lens E3, as shown in the following table: Table 2
• FIG. 3 to FIG. 6 are diagrams showing optical performance curves of the miniature imaging lens according to Embodiment 1 of the present invention, which respectively characterize chromatic aberration, astigmatism, distortion, and chromatic aberration of magnification of the miniature imaging lens of the present invention, from the figure. It can be clearly seen that the miniature imaging lens of Embodiment 1 of the present invention is significantly improved in terms of chromatic aberration, astigmatism, and distortion, and the image quality is greatly improved.
• Example 7 is a Monte Carlo yield analysis diagram showing the miniature imaging lens of Example 1 of the present invention. It can be seen from FIG. 7 that the yield of the lens can be as good as 1/2 Nyquist frequency. It reached 92.5%, which was significantly higher than the 77% yield of the prior art.
• Fig. 8 is a view showing a detailed configuration of a miniature imaging lens of Embodiment 2 of the present invention.
• the miniature imaging lens includes three aspherical lenses, and the first lens ⁇ and the aperture 4 having positive refractive power are sequentially along the optical axis from the object surface to the image surface.
• the shape of the three aspherical lenses is the same as that of the first embodiment, that is, the first lens is a meniscus convex lens, the second lens is a meniscus convex lens, and the third lens is a convex lens bow. lens.
• the focal length fl of the first lens is 3.15
• the focal length f2 of the second lens is -5.06
• the focal length f3 of the third lens is 5.77
• the focal length f of the entire lens is 3.45.
• the radius of curvature P1R1 of the first lens object side is 1.42704, the radius of curvature P1R2 of the first lens image side is 4.253, and the radius of curvature P2R2 of the second lens image side is - 1.721408.
• Table 3 and Table 4 show the relevant parameters of the lens of the specific embodiment 2 of the present invention, including the surface type of the lens surface, the radius of curvature, and the thickness, material, effective diameter and conical coefficient of each lens.
• each lens is sequentially numbered, the mirror surface of the first lens ⁇ is S1, S2, the pupil plane is S3, and the mirror surface of the second lens E2 is S4, S5,
• the third lens E3 has a mirror surface of S6, S7, and a filter E6, and the mirror faces are S8, S9, and S10, which are imaging planes.
• Table 4 is specific parameters of the aspherical higher order terms ⁇ 4, ⁇ 6, ⁇ 8, ⁇ 10, ⁇ 12, ⁇ 14, A16 of the first lens ⁇ , the second lens ⁇ 2, and the third lens ⁇ 3, as shown in the following table. : Table 4
• FIG. 12 are diagrams showing optical performance curves of the miniature imaging lens according to Embodiment 2 of the present invention, which respectively characterize chromatic aberration, astigmatism, distortion, and chromatic aberration of magnification of the miniature imaging lens of the present invention, from the figure. It can be clearly seen that the miniature imaging lens of the present invention is significantly improved in terms of chromatic aberration, astigmatism and distortion, and the image quality is greatly improved.
• Fig. 13 is a view showing a Monte Carlo yield analysis chart of the micro imaging lens of Example 2 of the present invention, and it can be seen from Fig. 13 that the yield of the lens can be as good as 1/2 Nyquist frequency. It reached 91%, significantly higher than the 77% yield of the prior art.
• the miniature imaging lens of the present invention has excellent optical performance, excellent imaging quality, and good tolerance tolerance, and can meet the needs of mass production of lens products, and can achieve stable quality in mass production. , greatly reducing production costs.

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• Optics & Photonics (AREA)
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• 2010
  • 2010-05-28 CN CN201010185833.1A patent/CN101846793A/zh active Pending
  • 2010-08-30 CN CN201080004202.3A patent/CN102439505B/zh active Active
  • 2010-08-30 JP JP2012516505A patent/JP2012517039A/ja active Pending
  • 2010-08-30 US US13/144,397 patent/US20120050888A1/en not_active Abandoned
  • 2010-08-30 WO PCT/CN2010/076456 patent/WO2011147136A1/zh not_active Ceased
  • 2010-08-30 EP EP10838369A patent/EP2444831A4/en not_active Withdrawn

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