TWI784660B - Six-piece optical lens module - Google Patents

Abstract

A six-piece optical lens module includes six lenses. The first lens has positive diopter, with the image side thereof being concave near the optic axis. The second lends has negative diopter, with the object side thereof being convex near the optic axis. The third lens has positive diopter, with the object side thereof being convex near the optic axis, and the image side thereof being concave near the optic axis. The fourth lens has the object and image sides being concave near the optic axis. The fifth lens has positive diopter, with the object and image sides thereof being convex near the optic axis. The six lens has positive diopter, with the object side thereof being convex near the optic axis. Thus, the sensitivity of the lens is lowered for reducing aberration and chromatism, improving the imaging quality and optical performance of the lens module.

Description

Six-piece optical lens module

The invention relates to a lens module, in particular to a six-piece optical lens module.

Press, optical lenses are widely used in various types of electronic products to provide camera functions. However, as people's requirements for the imaging quality of optical lenses are getting higher and higher, the performance of optical lenses is becoming more and more important.

In order to improve the optical performance of the lens module, the present invention discloses a six-piece optical lens module, which can reduce the influence of the environment on each lens by matching the curvature of each lens, thereby reducing the overall sensitivity, and each lens With matching dioptric power, aberration and chromatic aberration can be reduced to improve imaging quality and optical performance.

In order to achieve the above object, an embodiment of the present invention provides a six-piece optical lens module, which includes six lenses, and the six lenses include a first lens from an object side to an image side and along an optical axis. One eyeglass, one second eyeglass, one third eyeglass, one fourth eyeglass, one fifth eyeglass and one sixth eyeglass, and the six eyeglasses respectively have the object side facing the object side and the image side facing the image side, wherein, The first lens has positive refractive power, and the near optical axis of the image side of the first lens is concave; the second lens has negative refractive power, and the object side of the second lens is convex near the optical axis; the third lens has positive refractive power, and the third lens The near optical axis on the object side of the lens is convex, and the near optical axis on the image side is concave; the object side and image side of the fourth lens are concave at the near optical axis respectively; the fifth lens has positive refractive power, and the object side of the fifth lens and the image side are respectively convex at the near optical axis; and the sixth lens has positive refractive power, and the object side of the sixth lens is convex at the near optical axis.

In this way, under the matching of the curvature of each lens, it has the effect of reducing the overall sensitivity, and under the matching of the refractive power of each lens, it can reduce the aberration and chromatic aberration, so as to improve the imaging quality and optical performance.

In another embodiment of the present invention, the radius of curvature of the object side of the first lens is R1, and the radius of curvature of the image side is R2, and the focal length of the first lens is F1, which satisfies the following conditional formula: 0<(R1+ R2)/F1<1.5. In this way, the incident angle of light can be slowed down, the sensitivity can be reduced, and the problem of excessive peripheral aberration can be corrected.

In another embodiment of the present invention, wherein the focal length of the second lens is F2, and the focal length of the third lens is F3, which satisfy the following conditional formula: 0<|F2/F3|<1.5. In this way, the aberration of the pre-aperture system can be corrected through the appropriate combination of positive and negative refractive power.

In another embodiment of the present invention, the focal length of the fourth lens is F4, and the focal length of the fifth lens is F5, which satisfy the following conditional formula: 0<|F2/F3|/|F4/F5|<1.5. In this way, the front and back of the aperture can be better matched, and the system aberration can be further corrected.

In another embodiment of the present invention, the focal length of the first lens is F1, and the focal length of the sixth lens is F6, which satisfy the following conditional formula: 0<∣F1/F6∣+(∣F2/F3∣/∣F4/F5 ∣) <3. This corrects the system aberration.

In another embodiment of the present invention, the curvature radius of the object side of the sixth lens is R12, and the curvature radius of the image side is R13, which satisfy the following conditional formula: 0<R13/R12<2. Thereby, the light can be incident on the imaging surface at a smaller angle, the matching of the incident angle between the light and the imaging surface can be increased, and the brightness of the picture can be improved.

In another embodiment of the present invention, the image side of the fourth lens and the object side of the fifth lens are glued together. This corrects the system chromatic aberration.

In another embodiment of the present invention, the near optical axis on the object side of the first lens is convex.

In another embodiment of the present invention, the image side of the second lens near the optical axis is concave.

In another embodiment of the present invention, the image side of the sixth lens near the optical axis is concave.

In another embodiment of the present invention, the focal length of the fourth lens is negative.

In another embodiment of the present invention, the six lenses are made of glass and do not contain inflection points.

Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is not intended to limit the technical principles of the present invention to specific disclosed embodiments, but the scope of the present invention is only limited by the scope of the patent application, covering substitutions, modifications and equivalent.

Please refer to Fig. 1, which is a first embodiment of a six-piece optical lens module 100 of the present invention. The six-piece optical lens module 100 includes six lenses, and the six lenses are from an object side A to a Image side B and along an optical axis L sequentially include a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60 and a The optical filter 70 , and behind the image side 72 of the optical filter 70 also has an imaging surface C, and an aperture S disposed between the third lens 30 and the fourth lens 40 . Wherein, the six lenses have an object side facing the object side A and an image side facing the image side B respectively.

The first lens 10 has positive refractive power, and the image side 12 of the first lens 10 is concave near the optical axis L. In the embodiment of the present invention, the first lens 10 is made of glass and does not contain an inflection point. In another embodiment of the present invention, the near optical axis L of the object side 11 of the first lens 10 is convex.

The second lens 20 has a negative refractive power, and the object side 21 of the second lens 20 is convex near the optical axis L. In the embodiment of the present invention, the second lens 20 is made of glass and does not contain an inflection point. In another embodiment of the present invention, the near optical axis L of the image side 22 of the second lens 20 is a concave surface.

The third lens 30 has positive refractive power. The object side 31 of the third lens 30 near the optical axis L is convex, and the image side 32 of the third lens 30 near the optical axis L is concave. The third lens 30 is made of glass and does not contain an inflection point.

The object side 41 and the image side 42 of the fourth lens 40 are concave at the near optical axis L respectively. In the embodiment of the present invention, the fourth lens 40 is made of glass and does not contain an inflection point.

The fifth lens 50 has positive refractive power, and the object side 51 and the image side 52 of the fifth lens 50 are convex at the near optical axis L respectively. In the embodiment of the present invention, the fifth lens 50 is made of glass and does not contain an inflection point. In another embodiment of the present invention, the image side 42 of the fourth lens 40 and the object side 51 of the fifth lens 50 are glued together, so that the image side 42 of the fourth lens 40 and the object side 51 of the fifth lens 50 are bonded together without gaps.

The sixth lens 60 has positive refractive power, and the object side 61 of the sixth lens 60 near the optical axis L is convex. In the embodiment of the present invention, the sixth lens 60 is made of glass and does not contain an inflection point. In another embodiment of the present invention, the near optical axis L of the image side 61 of the sixth lens 60 is concave.

Then, please refer to Table 1, which is the design parameter value of the six-piece optical lens module 100 in this embodiment, wherein, the numbers 1 to 14 in Table 1 represent the surfaces of each element in sequence, and the odd numbers are The object side facing the object side, the even number is the image side facing the image side, and the thickness of the object side represents the thickness of each lens, and the thickness of the image side represents each lens and the next lens or the next aperture on the optical axis The spacing is the same in the following embodiments, and will not be repeated here:

Table I Table 1: The first embodiment The effective focal length EFL of the six-piece optical lens module 100 is 9.24mm, the entrance pupil diameter EPD is 5.775mm, the maximum viewing angle FOV is 40.3 degrees, the image height is 3.2mm, and the aperture value FNO is 1.6. lens noodle Curvature (mm) Radius of curvature (mm) Thickness (mm) material Refractive index (Nd) Abbe number (Vd) focal length (mm) first lens 1 0.145 6.875 2.618 Glass 1.773 49.600 19.747 2 0.096 10.402 0.057 second lens 3 0.193 5.175 1.920 Glass 1.946 17.944 -13.118 4 0.333 2.999 1.073 third lens 5 0.126 7.945 1.028 Glass 1.911 35.256 13.979 6 0.051 19.657 0.340 aperture 1.293 fourth lens 7 -0.168 -5.955 0.500 Glass 1.847 23.790 -3.647 8 0.148 6.767 0.000 fifth lens 9 0.148 6.767 3.819 Glass 1.835 42.730 4.278 10 -0.176 -5.667 0.114 sixth lens 11 0.132 7.597 4.184 Glass 1.911 35.256 13.355 12 0.068 14.782 1.305 filter 13 0.900 14 0.737

According to the aforementioned Table 1, the relationship values in Table 2 can be further obtained, wherein T1 to T12 represent the thickness of each lens and the distance between each lens, F1 to F6 represent the focal length of each lens, and R1 to R12 represent the curvature of each surface of each lens The radius is also expressed in the same way in the following embodiments, and will not be repeated here:

Table II Relational value Relational value T1/F 0.28 R1/F 0.74 T2/F 0.01 R2/F 1.13 T3/F 0.21 R3/F 0.56 T4/F 0.12 R4/F 0.32 T5/F 0.11 R5/F 0.86 T6/F 0.04 R6/F 2.13 T7/F 0.05 R7/F -0.64 T8/F 0.00 R8/F 0.73 T9/F 0.41 R9/F 0.73 T10/F 0.01 R10/F -0.61 T11/F 0.45 R11/F 0.82 T12/F 0.14 R12/F 1.60 F/F1 0.47 R1*R2 71.51 F/F2 -0.70 R3*R4 15.52 F/F3 0.66 R5*R6 156.17 F/F4 -2.53 R7*R8 -40.30 F/F5 2.16 R9*R10 -38.35 F/F6 0.69 R11*R12 112.30 TTL 19.89 TTL/F 2.15

According to the values in Table 1 and Table 2, it shows that the focal length of the fourth lens in the embodiment of the present invention is negative, and also satisfies the following conditional formula, 0<(R1+R2)/F1<1.5. In this way, the first lens 10 can slow down the incident angle of the light and reduce the sensitivity through the matching of the predetermined curvature and the focal length, and can also correct the problem of excessive peripheral aberration.

In the embodiment of the present invention, the following conditional formula is further satisfied, 0<∣F2/F3∣<1.5. In this way, the positive and negative refractive powers of the second lens 20 and the third lens 30 can be matched to correct the aberration of the front system of the aperture S.

In the embodiment of the present invention, the following conditional formula is further satisfied, 0<∣F2/F3∣/∣F4/F5∣<1.5. In this way, a better matching effect can be obtained between the front and rear of the aperture S, and the aberration of the overall system can be corrected accordingly.

In the embodiment of the present invention, the following conditional formula is further satisfied, 0<∣F1/F6∣+(∣F2/F3∣/∣F4/F5∣)<3. Thereby, the overall system can obtain a better matching effect, so as to correct the aberration of the overall system.

In the embodiment of the present invention, the following conditional formula is further satisfied, 0<R13/R12<2. In this way, the curvature matching of the sixth lens 60 through the object side 61 and the image side 62 allows light to be incident on the imaging surface C at a smaller angle, increasing the matching of incident angles between the light and the imaging surface C, thereby improving the brightness of the picture.

Please refer to Figure 2, which is the lateral chromatic aberration diagram of the first embodiment of the present invention. The maximum field viewing angle is based on 20.1728 degrees, and blue light with a wavelength of 0.47 µm, green light with a wavelength of 0.555 µm and red light with a wavelength of 0.65 µm are used as Color difference representation. Referring to Fig. 3, it is a horizontal ray fan diagram of the first embodiment of the present invention, the X-axis is the position where the light passes through the aperture S, and the Y-axis is the position where the ray is projected onto the image plane (such as the imaging surface C), and each figure The five curves represent the five wavelengths of image light (for example, blue light with a wavelength of 0.47µm, green light with a wavelength of 0.510µm, red light with a wavelength of 0.555µm, yellow light with a wavelength of 0.610µm, and pink light with a wavelength of 0.650µm). Please refer to FIG. 4 , which is a field curvature diagram and a distortion diagram of the first embodiment of the present invention. Among them, the figure shows that the distortion of the multi-wavelength images is similar, which makes the chromatic aberration of the present invention less obvious.

Thereby, the method of setting the aperture S in the center of the present invention, together with the matching of the curvature of each lens, can reduce the influence of the environment on each lens of the present invention, thereby reducing the overall sensitivity, and the matching of the refractive power of each lens can reduce the image Aberrations and chromatic aberrations are used to improve the overall image quality and optical performance.

Please refer to FIG. 5 to FIG. 8 , which are the second embodiment of the present invention. FIG. 5 is a schematic structural diagram of a six-piece optical lens module 100 a. 6 to 8 are the lateral chromatic aberration diagram, the lateral ray fan diagram, the field curvature diagram and the distortion diagram of the second embodiment, respectively. The configuration of the second embodiment is roughly the same as that of the first embodiment, and the difference is that in this embodiment, the effective focal length EFL is 9.16 mm, the entrance pupil diameter EPD is 5.725 mm, and the maximum viewing angle FOV is 40 degrees.

Next, please refer to Table 3, which is the design parameter value of the six-piece optical lens module 100a in the second embodiment:

Table three Table three: the second embodiment The effective focal length EFL of the six-piece optical lens module 100a is 9.16mm, the entrance pupil diameter EPD is 5.725mm, the maximum viewing angle FOV is 40 degrees, the image height is 3.2mm, and the aperture value FNO is 1.6. lens noodle Curvature (mm) Radius of curvature (mm) Thickness (mm) material Refractive index (Nd) Abbe number (Vd) focal length (mm) first lens 1 0.132 7.549 2.589 Glass 1.773 49.600 21.615 2 0.086 11.679 0.078 second lens 3 0.206 4.856 1.888 Glass 1.946 17.944 -15.081 4 0.340 2.942 1.256 third lens 5 0.101 9.916 1.797 Glass 1.911 35.256 14.271 6 0.027 37.579 0.077 aperture 1.033 fourth lens 7 -0.168 -5.955 0.500 Glass 1.847 23.790 -3.187 8 0.192 5.195 0.001 fifth lens 9 0.192 5.195 3.147 Glass 1.835 42.730 3.625 10 -0.189 -5.300 0.090 sixth lens 11 0.108 9.222 4.342 Glass 2.001 25.435 15.209 12 0.057 17.680 1.367 filter 13 0.900 14 0.737

According to the aforementioned Table 3, the value of the relational expression in Table 4 can be further obtained:

Table four Relational value Relational value T1/F 0.28 R1/F 0.82 T2/F 0.01 R2/F 1.28 T3/F 0.21 R3/F 0.53 T4/F 0.14 R4/F 0.32 T5/F 0.20 R5/F 1.08 T6/F 0.01 R6/F 4.10 T7/F 0.05 R7/F -0.65 T8/F 0.00 R8/F 0.57 T9/F 0.34 R9/F 0.57 T10/F 0.01 R10/F -0.58 T11/F 0.47 R11/F 1.01 T12/F 0.15 R12/F 1.93 F/F1 0.42 R1*R2 88.16 F/F2 -0.61 R3*R4 14.29 F/F3 0.64 R5*R6 372.63 F/F4 -2.87 R7*R8 -30.94 F/F5 2.53 R9*R10 -27.53 F/F6 0.60 R11*R12 163.04 TTL 19.80 TTL/F 2.16

According to the aforementioned conditions, the second embodiment of the present invention also has the effects of the first embodiment.

Please refer to FIG. 9 to FIG. 12 , which are the third embodiment of the present invention. FIG. 9 is a schematic structural diagram of a six-piece optical lens module 100 b. 10 to 12 are the lateral chromatic aberration diagram, lateral ray fan diagram, field curvature diagram and distortion diagram of the third embodiment, respectively. The configuration of the third embodiment is roughly the same as that of the first embodiment, except that the effective focal length EFL in this embodiment is 9.18 mm, the entrance pupil diameter EPD is 5.736 mm, and the maximum viewing angle FOV is 40.2 degrees.

Next, please refer to Table 5, which is the design parameter value of the six-piece optical lens module 100 in the second embodiment:

Table five Table five: the third embodiment The effective focal length EFL of the six-piece optical lens module 100b is 9.18mm, the entrance pupil diameter EPD is 5.736mm, the maximum viewing angle FOV is 40.2 degrees, the image height is 3.2mm, and the aperture value FNO is 1.6. lens noodle Curvature (mm) Radius of curvature (mm) Thickness (mm) material Refractive index (Nd) Abbe number (Vd) focal length (mm) first lens 1 0.124 8.097 2.474 Glass 1.816 46.543 20.360 2 0.074 13.571 0.017 second lens 3 0.205 4.880 1.856 Glass 1.946 17.944 -16.424 4 0.330 3.031 1.520 third lens 5 0.089 11.232 1.540 Glass 1.911 35.256 15.868 6 0.022 46.272 0.082 aperture 0.912 fourth lens 7 -0.171 -5.841 0.500 Glass 1.847 23.790 -3.164 8 0.192 5.216 0.001 fifth lens 9 0.192 5.216 3.294 Glass 1.835 42.730 3.719 10 -0.181 -5.518 0.090 sixth lens 11 0.109 9.185 4.339 Glass 2.001 25.435 14.883 12 0.055 18.077 1.538 filter 13 0.900 14 0.737

According to the aforementioned Table 5, the value of the relational expression in Table 6 can be further obtained:

Table six Relational value Relational value T1/F 0.27 R1/F 0.88 T2/F 0.00 R2/F 1.48 T3/F 0.20 R3/F 0.53 T4/F 0.17 R4/F 0.33 T5/F 0.17 R5/F 1.22 T6/F 0.01 R6/F 5.04 T7/F 0.05 R7/F -0.64 T8/F 0.00 R8/F 0.57 T9/F 0.36 R9/F 0.57 T10/F 0.01 R10/F -0.60 T11/F 0.47 R11/F 1.00 T12/F 0.17 R12/F 1.97 F/F1 0.45 R1*R2 109.88 F/F2 -0.56 R3*R4 14.79 F/F3 0.58 R5*R6 519.73 F/F4 -2.90 R7*R8 -30.47 F/F5 2.47 R9*R10 -28.78 F/F6 0.62 R11*R12 166.04 TTL 19.80 TTL/F 2.16

According to the aforementioned conditions, the third embodiment of the present invention also has the effects of the first embodiment.

Although the present invention has been described in terms of a preferred embodiment, those skilled in the art can make various changes without departing from the spirit and scope of the present invention. The above-mentioned embodiments are only used to illustrate the present invention, and are not intended to limit the scope of the present invention. All modifications or changes that do not violate the spirit of the present invention belong to the patent scope of the present invention.

100: Six-piece optical lens module A: Object side B: image side L: optical axis 10: First lens 11: Object side 12: Like the side 20: second lens 21: Object side 22: Like the side 30: Third lens 31: Object side 32: Like the side 40: Fourth lens 41: Object side 42: Like the side 50: fifth lens 51: Object side 52: Like the side 60: sixth lens 61: Object side 62: Like the side 70: filter 71: Object side 72: Like the side S: Aperture C: imaging surface 100a: Six-piece optical lens module 100b: Six-piece optical lens module

[FIG. 1] is a schematic structural view of the first embodiment of the six-piece optical lens module of the present invention. [ Fig. 2 ] is a lateral chromatic aberration diagram of the first embodiment of the six-piece optical lens module of the present invention. [ Fig. 3 ] is the fan diagram of the horizontal light rays of the first embodiment of the six-piece optical lens module of the present invention. [Fig. 4] is the field curvature diagram and distortion diagram of the first embodiment of the six-piece optical lens module of the present invention. [FIG. 5] is a schematic structural diagram of the second embodiment of the six-piece optical lens module of the present invention. [ FIG. 6 ] is a lateral chromatic aberration diagram of the second embodiment of the six-piece optical lens module of the present invention. [ FIG. 7 ] is the fan diagram of the horizontal light rays of the second embodiment of the six-piece optical lens module of the present invention. [Fig. 8] is the field curvature diagram and distortion diagram of the second embodiment of the six-piece optical lens module of the present invention. [ FIG. 9 ] is a schematic structural view of the third embodiment of the six-piece optical lens module of the present invention. [ Fig. 10 ] is a lateral chromatic aberration diagram of the third embodiment of the six-piece optical lens module of the present invention. [ Fig. 11 ] is the fan diagram of the horizontal light rays of the third embodiment of the six-piece optical lens module of the present invention. [Fig. 12] is the field curvature diagram and distortion diagram of the third embodiment of the six-piece optical lens module of the present invention.

100: Six-piece optical lens module

A: Object side

B: image side

L: optical axis

10: First lens

11: Object side

12: Like the side

20: second lens

21: Object side

22: Like the side

30: Third lens

31: Object side

32: Like the side

40: Fourth lens

41: Object side

42: Like the side

50: fifth lens

51: Object side

52: Like the side

60: sixth lens

61: Object side

62: Like the side

70: filter

71: Object side

72: Like the side

S: Aperture

C: imaging surface

Claims (11)

A six-piece optical lens module, which includes six lenses, the six lenses from an object side to an image side and along an optical axis sequentially include a first lens, a second lens, and a third lens , a fourth lens, a fifth lens, and a sixth lens, and the six lenses respectively have an object side facing the object side and an image side facing the image side, wherein: the first lens has positive refractive power, the The image side of the first lens is concave near the optical axis; the second lens has negative refractive power, and the object side of the second lens is convex near the optical axis; the third lens has positive refractive power, and the third lens has a positive refractive power. The object side is convex near the optical axis, and the image side is concave near the optical axis; the object side and the image side of the fourth lens are respectively concave near the optical axis; the fifth lens has positive refractive power, and the fourth lens has positive refractive power. The object side and the image side of the fifth lens are respectively convex near the optical axis; and the sixth lens has positive refractive power, and the object side of the sixth lens is convex near the optical axis, wherein the object side of the sixth lens The radius of curvature is R12, and the radius of curvature of the image side is R13, which satisfies the following conditional formula: 0<R13/R12<2. The six-piece optical lens module as described in Claim 1, wherein the radius of curvature of the object side of the first lens is R1, and the radius of curvature of the image side is R2, and the focal length of the first lens is F1, which The following conditional expression is satisfied: 0<(R1+R2)/F1<1.5. The six-piece optical lens module as described in Claim 1, wherein the focal length of the second lens is F2, and the focal length of the third lens is F3, which satisfy the following conditional formula: 0<|F2/F3|<1.5 . The six-piece optical lens module as described in Claim 3, wherein the focal length of the fourth lens is F4, and the focal length of the fifth lens is F5, which satisfy the following conditional formula: 0<|F2/F3|/| F4/F5|<1.5. The six-piece optical lens module as described in Claim 4, wherein the focal length of the first lens is F1, and the focal length of the sixth lens is F6, which satisfy the following conditional formula: 0<|F1/F6|+( |F2/F3|/|F4/F5|)<3. The six-piece optical lens module according to claim 1, wherein the image side of the fourth lens and the object side of the fifth lens are glued together. The six-piece optical lens module according to Claim 1, wherein the object side of the first lens is convex near the optical axis. The six-piece optical lens module according to Claim 1, wherein the image side of the second lens is concave near the optical axis. The six-piece optical lens module according to Claim 1, wherein the image side of the sixth lens is concave near the optical axis. The six-piece optical lens module according to Claim 1, wherein the focal length of the fourth lens is negative. The six-piece optical lens module as described in claim 1, wherein the six lenses are made of glass and do not contain inflection points.

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