TWM534824U - Miniature telephoto lens - Google Patents

Description

Micro telescope head

The present invention relates to a telescope head, and more particularly to a miniature telescope head.

Telescope head, also known as telephoto lens, telephoto lens, its focal length is generally more than 200 mm (mm), and the viewing angle is within 20 degrees, so the telescope head can shoot a larger image than the standard lens at the same distance. It is suitable for shooting distant scenes, and because its depth of field is smaller than the standard lens, it can effectively blur the background and highlight the subject.

A common telescope head is a "long-focus lens" of the Chinese Patent Publication No. CN 101510001, which comprises a frame, an end cover disposed on the frame, and a lens group disposed in the frame, the lens group being provided by the object side a meniscus convex lens, a double concave lens, a first meniscus concave lens, a lenticular lens and a second meniscus concave lens are arranged in sequence, and the first meniscus concave lens and the lenticular lens are in contact with each other, and the double concave lens is A first spacer is disposed between the first meniscus concave lens, and a spacer is disposed between the lenticular lens and the second meniscus concave lens. In this way, the telescope head can have the advantages of small optical distortion, high resolution, and good night vision effect.

However, the length of the telescope head is long and heavy, but it is often used for outdoor shooting. For example, shooting distant animals often causes inconvenience of carrying. Therefore, how to further reduce the size of the telescope head is a Big topic.

The main purpose of the novel is to solve the problem that the length of the telescope head is long and the weight is heavy, which causes difficulty in carrying.

In order to achieve the above object, the present invention provides a micro telescope head, which is a first lens having positive refractive power, a second lens having negative refractive power, and a third lens having positive refractive power, from the object side to the image side. a fourth lens having a negative refractive power and a fifth lens having a negative refractive power, wherein the object side surface and the image side surface of the first lens are both convex, and the object side surface and the image side surface of the second lens are concave, the third lens The side surface of the object is a concave surface, and the image side surface is a convex surface. The object side surface of the fourth lens is a concave surface, and the object side surface of the fifth lens is a concave surface, and the image side surface is a convex surface.

In order to achieve the above object, the present invention further provides a micro telescope head, which is a first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power, from the object side to the image side. a fourth lens having a negative refractive power and a fifth lens having a negative refractive power, wherein a radius of curvature of the side surface of the first lens is larger than a radius of curvature of the image side surface, and a radius of curvature of the object side surface of the second lens is smaller than a radius of curvature of the image side surface, The radius of curvature of the side surface of the third lens is smaller than the radius of curvature of the side surface of the image, and the product of the radius of curvature of the side of the object and the radius of curvature of the image side is positive. The radius of curvature of the object surface is larger than the radius of curvature of the side of the image, and the curvature of the side of the object The product of the radius and the radius of curvature of the image side is a positive value, and the radius of curvature of the side surface of the fifth lens is larger than the radius of curvature of the side surface of the image, and the product of the radius of curvature of the object side and the radius of curvature of the image side is positive.

In summary, since the fifth lens has a negative refractive power and is disposed with the first lens, the second lens, the third lens, and the fourth lens, the angle of the incident light can be suppressed, thereby contributing to shortening the overall The length of the system can reduce the size of the telescope head.

L1‧‧‧ first lens

L2‧‧‧ second lens

L3‧‧‧ third lens

L4‧‧‧ fourth lens

L5‧‧‧ fifth lens

S1‧‧‧ aperture

S2‧‧‧Light

10‧‧‧Filter

20‧‧‧ imaging surface

Figure 1 is a schematic view of an optical system of the first embodiment of the present invention.

Fig. 2 is a distortion diagram of the first embodiment of the present invention.

3A to 3E are transverse light fan diagrams of the first embodiment of the present invention.

Figure 4 is a schematic view of an optical system of a second embodiment of the present invention.

Fig. 5 is a distortion diagram of the second embodiment of the present invention.

6A-6E are transverse light fan diagrams of the second embodiment of the present invention.

Figure 7 is a schematic view of an optical system of a third embodiment of the present invention.

Figure 8 is a distortion diagram of a third embodiment of the present invention.

9A to 9E are transverse light fan diagrams of a third embodiment of the present invention.

The detailed description and technical content of the present invention will now be described with reference to the following drawings: Please refer to FIG. 1 to FIG. 9E. The present invention is a micro telescope head, which is sequentially from the object side to the image side. a first lens L1 having positive refractive power, a second lens L2 having negative refractive power, a third lens L3 having positive refractive power, a fourth lens L4 having negative refractive power, and a fifth lens L5 having negative refractive power, The object side surface and the image side surface of the first lens L1 are convex and the radius of curvature of the object side surface is larger than the curvature radius of the image side surface. The object side surface and the image side surface of the second lens L2 are both concave and the curvature radius of the object side surface is smaller than the curvature of the side surface of the image. Radius, the side surface of the third lens L3 is a concave surface, the image side surface is convex, and the curvature radius of the object side surface is smaller than the curvature radius of the image side surface, and the product of the curvature radius of the object side surface and the curvature radius of the image side surface is positive, the fourth lens The side of the object of L4 is concave and the radius of curvature of the side of the object is larger than the radius of curvature of the side of the image, and the product of the radius of curvature of the side of the object and the radius of curvature of the image side is positive, and the object side of the fifth lens L5 A concave surface, a convex surface and the image side surface of the object-side radius of curvature greater than the radius of curvature of the image side surface, and the object-side surface with a curvature radius of the image side The product of the radius of curvature of the face is positive. The object side surface and the image side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are all aspherical, and the materials are all plastic.

By the fifth lens L5 having a negative refractive power and being disposed with the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4, the angle of the incident light can be suppressed, which contributes to shortening The length of the overall system can reduce the size of the telescope head.

In addition, the overall effective focal length of the micro telescope head is f, and the radius of curvature of the object side surface of the first lens L1 is R1, and satisfies the following relationship: 3< f / R 1<4.5, so that the peripheral light of the incident light can be corrected. The resulting aberrations result in better image quality.

The overall effective focal length of the micro telescope head is f, and the radius of curvature of the object side of the fifth lens L5 is R9, which satisfies the following relationship: |f/R9|<2.6, which can correct the edge light incident on the lens. The aberration is to reduce the sensitivity of the lens to the imaging quality, and can suppress the angle of the incident light and improve the telephoto effect.

The overall effective focal length of the micro-miniature telescope head is f, and the curvature radius of the image side surface of the fifth lens L5 is R10, and satisfies the following relationship: 0.6<| f / R 10|<1.0, which can avoid the difference in lens shape change. Too large, which is conducive to the correction of stray light at the edge of the lens.

In the present invention, the first lens L1 and the second lens L2 are collectively referred to as a front group lens, and the third lens L3, the fourth lens L4 and the fifth lens L5 are collectively referred to as a rear group lens, and The focal length of the front group lens is f12, and the focal length of the rear group lens is f345, and the following relationship is satisfied: 0.8<| f 12/ f 345|<1.2 Therefore, the positive refractive power and negative refractive power of the front group lens and the rear group lens are Close, indicating that the front and back groups can compensate each other, and help to correct the aberrations.

The system length of the micro telescope head is TTL, and the overall effective focal length of the micro telescope head is f, which satisfies the following relationship: TTL/f≦0.9 This design can effectively reduce the system volume and contribute to the micro The mini telescope head is miniaturized.

The overall lens thickness of the micro telescope head is ATL, and the optical axis gap length of the micro telescope head is Gaa, which satisfies the following relationship: ATL/Gaa≦1.5, wherein the smaller the value, the lighter the weight of the system, and Helps the micro telescope head to be miniaturized. And preferably, in order to obtain a better effect, the present invention satisfies the following relationship: 0.8≦ATL/Gaa≦1.4

The radius of curvature of the side surface of the fifth lens L5 is R9, and the radius of curvature of the image side surface of the fifth lens L5 is R10, which satisfies the following relationship: -2.5≦(R9+R10)/(R9-R10)≦ -1.5 is good for correcting aberrations.

Finally, the distance from the image side of the second lens L2 to the object side of the third lens L3 is T4, and the distance from the image side of the third lens L3 to the object side of the fourth lens L4 is T6, the fourth lens The distance from the side of the image of L4 to the side of the object of the fifth lens L5 is T8, which satisfies the following relationship: (T4+T6+T8)/T6≧8, which can effectively reduce the assembly error and obtain better Good assembly sensitivity. In the present invention, in order to obtain a better effect, it is preferable to satisfy the following relationship: 10 ≦ (T4 + T6 + T8) / T6 ≦ 22.

Referring to FIG. 1 , a schematic diagram of an optical system according to a first embodiment of the present invention, from the object side to the image side, is sequentially an aperture S1, a first lens L1, a second lens L2, and an aperture S2. a third lens L3, a fourth lens L4, a fifth lens L5, a filter 10, and an imaging surface 20, the first lens L1 has a positive refractive power, and the object side surface and the image side surface are convex. The second lens L2 has a negative refractive power, and both the object side surface and the image side surface are concave. The third lens L3 has a positive refractive power, and the object side surface thereof is a concave surface, and the image side surface is a convex surface, and the fourth lens L4 has a negative refractive power. The side surface of the object is a concave surface, and the side surface is a convex surface. The fifth lens L5 has a negative refractive power, and the object side surface is a concave surface, and the image side surface is a convex surface. By the negative refractive power of the fifth lens L5, the angle of the incident light can be suppressed, which contributes to shortening the overall system length. Among them, the aperture S2 of the present invention can be arbitrarily added, and in the case where the aperture S2 is provided, the effect of correcting the aberration is optimal.

The detailed values of this embodiment are shown in Table 1:

Wherein, the surface 2 is the object side surface of the first lens L1, the surface 3 is the image side surface of the first lens L1, the surface 4 is the object side surface of the second lens L2, and the surface 5 is the image side surface of the second lens L2. The surface 7 is the object side surface of the third lens L3, the surface 8 is the image side surface of the third lens L3, the surface 9 is the object side surface of the fourth lens L4, and the surface 10 is the image side surface of the fourth lens L4, and the surface 11 For the side surface of the fifth lens L5, the surface 12 is the image side surface of the fifth lens L5. The embodiments of the present invention are the same, and will not be further described later.

The distance between the surface 1 is the distance from the aperture S1 to the side surface of the first lens L1; the distance between the surface 2 is the distance from the object side of the first lens L1 to the image side of the first lens L1; The distance from the image side of the first lens L1 to the object side of the second lens L2; the distance between the surface 4 is the distance from the object side of the second lens L2 to the image side of the second lens L2, and so on, The spacing from the surface 14 is the distance from the image side of the filter 10 to the imaging surface 20. In the respective embodiments, the definitions of the intervals are also the same, and will not be further described later.

The overall effective focal length of the micro telescope head is 5.925mm, the aperture value Fno is 2.8, the field of view FOV is 41.6, and the imaging height IMGH is 2.285mm, and the maximum entrance aperture value EPD is 2.116. In addition, the first lens L1 and the second lens L2 are collectively referred to as a front group lens, and the third lens L3, the fourth lens L4 and the fifth lens L5 are collectively referred to as a rear group lens, and the focal length of the front group lens is 4.15mm, the focal length of the rear group lens is -4.11mm.

The embodiment satisfies the following relationship: 3< f / R 1<4.5, and can correct the aberration caused by the ambient light of the incident light to obtain better imaging quality, wherein the overall effective focal length of the micro telescope head is f The radius of curvature of the side surface of the first lens L1 is R1. In the present embodiment, f/R1 = 4.02. Therefore, the present embodiment has the effect of correcting aberrations, and a better image quality can be obtained.

This embodiment also satisfies the following relationship: |f/R9|<2.6 can correct the aberration caused by the edge light incident on the lens to reduce the sensitivity of the lens to the image quality, and can suppress the angle of the incident light and improve the telescopic effect. The micro telescope head The overall effective focal length is f, and the radius of curvature of the object side surface of the fifth lens L5 is R9. In the present embodiment, |f/R9|=2.43, the aberration can be effectively corrected to reduce the lens quality for imaging. Sensitivity, and can suppress the angle of incident light, thereby improving the telephoto effect.

The embodiment further satisfies the following relationship: 0.6<| f / R 10|<1.0 can avoid the difference of the shape change of the lens is too large, and is beneficial to the correction of the stray light at the edge of the lens, wherein the overall effective focal length of the micro telescope head is f, the radius of curvature of the image side surface of the fifth lens L5 is R10. In the present embodiment, |f/R10|=0.83, it is advantageous for the correction of the stray light at the edge of the lens.

In addition, the present embodiment satisfies the following relationship: 0.8<| f 12/ f 345|<1.2, the closer the positive refractive power and the negative refractive power of the front group lens and the rear group lens are, indicating that the front and rear groups can compensate each other, and help to correct The aberration, wherein the focal length of the front group lens is f12, and the focal length of the rear group lens is f345. In the present embodiment, |f12/f345|=1.01, thereby contributing to correcting the aberration.

The embodiment also satisfies the following relationship: TTL/f≦0.9 can effectively reduce the system volume, and contributes to the miniaturization of the micro telescope head, wherein the system length of the micro telescope head is TTL, the micro size The overall effective focal length of the telescope head is f. In the present embodiment, TTL/f = 0.82, which contributes to miniaturization of the system.

This embodiment also satisfies the following relationship: ATL/Gaa≦1.5 The miniaturized telescope head is miniaturized. The overall lens thickness of the micro telescope head is ATL, and the optical axis gap length of the micro telescope head is Gaa, and preferably, the embodiment satisfies the following The relational expression: 0.8 ≦ ATL / Gaa ≦ 1.4 and in the present embodiment, ATL / Gaa = 1.29, thus contributing to system miniaturization.

Furthermore, the present embodiment satisfies the following relationship: -2.5 ≦ (R9 + R10) / (R9 - R10) ≦ - 1.5 is advantageous for correcting aberrations, wherein the radius of curvature of the object side of the fifth lens L5 is R9 The curvature radius of the image side surface of the fifth lens L5 is R10. In the present embodiment, (R9+R10)/(R9-R10)=-1.97, it is advantageous to correct the aberration.

Finally, the embodiment satisfies the following relationship: (T4+T6+T8)/T6≧8, which can effectively reduce the assembly error and achieve better assembly sensitivity, wherein the image side of the second lens L2 is The distance from the side of the object of the third lens L3 is T4, the distance from the image side of the third lens L3 to the object side of the fourth lens L4 is T6, and the image side of the fourth lens L4 is to the fifth lens L5. The distance from the side of the object is T8, and preferably, the present embodiment satisfies the following relationship: 10≦(T4+T6+T8)/T6≦22 In the present embodiment, (T4+T6+T8)/T6= 11.48, so assembly errors can be reduced and better assembly sensitivity can be achieved.

Referring to FIG. 2 and FIG. 3A to FIG. 3E, the distortion diagram and the transverse light fan diagram of the first embodiment of the present invention are respectively shown. In Fig. 2, the incident light was set to 0.542 μm, and it was found that the distortion generated in this example was less than 1.5%. In "Fig. 3A" to "Fig. 3E", the Y-axis range is between -20 micrometers (μm) and 20 micrometers (μm), and the wavelength is 0.488 micrometers (μm), 0.542 micrometers (μm), 0.6 micron (μm) of incident light is incident, and this embodiment is different in shadow The image height difference produced by the image height is between 6.6 microns and -23 microns. Therefore, the aberration and distortion of the embodiment can be effectively corrected, and the image quality is better.

The object side surface and the image side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are all aspherical, and the materials are all plastic. Therefore, the following aspheric equations will be satisfied: Where cl/r, r is the radius of curvature of the surface, h is the height of the ray on the surface, k is the cone coefficient, A is the second-order coefficient, B is the fourth-order coefficient, C is the sixth-order coefficient, and D is The eighth-order coefficient, E is the tenth-order coefficient, F is the twelfth-order coefficient, G is the fourteenth-order coefficient, and H is the sixteenth-order coefficient.

In the embodiment, the aspheric parameters of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are as shown in Table 2:

Referring to FIG. 4, a schematic diagram of an optical system according to a second embodiment of the present invention is provided, which is the same as the first embodiment, and thus will not be described again.

The detailed values of this embodiment are shown in Table 3:

The overall effective focal length of the micro telescope head is 5.78mm, the aperture value Fno is 2.8, the field of view FOV is 42.3, the imaging height IMGH is 2.285mm, the maximum entrance aperture value EPD is 2.064, and the focal length of the front group lens is 4.09. Mm, the focal length of the rear group lens is -4.54 mm.

The embodiment satisfies the following relationship: 3< f / R 1<4.5, and can correct the aberration caused by the ambient light of the incident light to obtain better imaging quality, wherein the overall effective focal length of the micro telescope head is f The radius of curvature of the side surface of the first lens L1 is R1. In the present embodiment, f/R1 = 3.97. Therefore, the present embodiment has the effect of correcting aberrations, and a better image quality can be obtained.

This embodiment also satisfies the following relationship: |f/R9|<2.6, which can correct the aberration caused by the edge light incident on the lens, so as to reduce the sensitivity of the lens to the imaging quality, and can suppress the angle of the incident light and improve the telephoto position. The effect is that the overall effective focal length of the micro telescope head is f, and the radius of curvature of the object side surface of the fifth lens L5 is R9. In the embodiment, |f/R9|=2.19, so that the image can be effectively corrected. Poor, to reduce the sensitivity of the lens to imaging quality, and can suppress the angle of incident light, thereby improving the telephoto effect.

The embodiment further satisfies the following relationship: 0.6<| f / R 10|<1.0 can avoid the difference of the shape change of the lens is too large, and is beneficial to the correction of the stray light at the edge of the lens, wherein the overall effective focal length of the micro telescope head is f, the radius of curvature of the image side surface of the fifth lens L5 is R10. In the present embodiment, |f/R10|=0.81, which is advantageous for the correction of stray light at the edge of the lens.

In addition, the present embodiment satisfies the following relationship: 0.8<| f 12/ f 345|<1.2 The refractive power of the front group lens and the rear group lens is closer to the positive refractive power and the negative refractive power, indicating that the front and back groups can compensate each other, and the help is helpful. For correcting the aberration, the focal length of the front group lens is f12, and the focal length of the rear group lens is f345. In the present embodiment, |f12/f345|=0.90, which helps to correct the aberration.

The embodiment also satisfies the following relationship: TTL/f≦0.9 can effectively reduce the system volume, and contributes to the miniaturization of the micro telescope head, wherein the system length of the micro telescope head is TTL, the micro size The overall effective focal length of the telescope head is f. In this embodiment, TTL/f = 0.85, which contributes to system miniaturization.

The embodiment also satisfies the following relationship: ATL/Gaa≦1.5 to facilitate miniaturization of the micro telescope head, wherein the overall lens thickness of the micro telescope head is ATL, and the optical axis gap length of the micro telescope head It is Gaa, and preferably, the present embodiment satisfies the following relationship: 0.8 ≦ ATL / Gaa ≦ 1.4 and in the present embodiment, ATL / Gaa = 1.40, thus contributing to system miniaturization.

Furthermore, the present embodiment satisfies the following relationship: -2.5 ≦ (R9 + R10) / (R9 - R10) ≦ - 1.5 is advantageous for correcting aberrations, wherein the radius of curvature of the object side of the fifth lens L5 is R9 The curvature radius of the image side surface of the fifth lens L5 is R10. In the present embodiment, (R9+R10)/(R9-R10)=-2.04, which is advantageous for correcting aberrations.

Finally, the embodiment satisfies the following relationship: (T4+T6+T8)/T6≧8, which can effectively reduce the assembly error and achieve better assembly sensitivity, wherein the image side of the second lens L2 is The distance of the side surface of the third lens L3 is T4, and the image side of the third lens L3 The distance from the side of the object of the fourth lens L4 to the side of the object of the fourth lens L4 is T8. Preferably, the embodiment further satisfies the following relationship: In the present embodiment, (T4+T6+T8)/T6≦22, (T4+T6+T8)/T6=21.56, the assembly error can be reduced, and better assembly sensitivity can be obtained.

Referring to FIG. 5 and FIG. 6A to FIG. 6E, the distortion diagram and the transverse light fan diagram of the second embodiment of the present invention are respectively shown. In Fig. 5, the incident light is set to 0.542 micrometers (μm), and it can be seen that the distortion generated in this embodiment is less than 1.35%. In "FIG. 6A" to "FIG. 6E", the Y-axis ranges from -20 micrometers (μm) to 20 micrometers (μm) and has a wavelength of 0.488 micrometers (μm) and 0.542 micrometers (μm). Incident light of 0.6 micrometers (μm) is incident, and the aberration value produced by the present embodiment at different image heights is between 8 micrometers and -20 micrometers. Therefore, the aberration and distortion of the embodiment can be effectively corrected, and the image quality is better.

The object side surface and the image side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are all aspherical, and the materials are all plastic. Therefore, the following aspheric equations will be satisfied: Where c=l/r, r is the radius of curvature of the surface, h is the height of the light on the surface, k is the cone coefficient, A is the second-order coefficient, B is the fourth-order coefficient, and C is the sixth-order coefficient. D is the eighth-order coefficient, E is the tenth-order coefficient, F is the twelfth-order coefficient, G is the fourteenth-order coefficient, and H is the sixteenth-order coefficient.

In the embodiment, the aspheric parameters of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are as shown in Table 4: Table 4

Continuing to refer to FIG. 7 , which is a schematic diagram of an optical system according to a third embodiment of the present invention, the configuration of which is the same as that of the first embodiment, and thus will not be described again.

The detailed values of this embodiment are shown in Table 5:

The overall effective focal length of the micro telescope head is 5.83mm, the aperture value Fno is 2.8, the field of view FOV is 42, and the imaging height IMGH is 2.285mm, the maximum entrance aperture value EPD is 2.083, and the focal length of the front group lens is 4.11. Mm, the focal length of the rear group lens is -4.38 mm.

The embodiment satisfies the following relationship: 3< f / R 1<4.5, and can correct the aberration caused by the ambient light of the incident light to obtain better imaging quality, wherein the overall effective focal length of the micro telescope head is f The radius of curvature of the side surface of the first lens L1 is R1. In the present embodiment, f/R1=4.00. Therefore, the present embodiment has the effect of correcting aberrations, and a better image quality can be obtained.

This embodiment also satisfies the following relationship: |f/R9|<2.6, which can correct the aberration caused by the edge light incident on the lens, so as to reduce the sensitivity of the lens to the imaging quality, and can suppress the angle of the incident light and improve the telephoto position. The effect is that the overall effective focal length of the micro telescope head is f, and the radius of curvature of the object side of the fifth lens L5 is R9, in this embodiment. Medium, |f/R9|=2.23, so the aberration can be effectively corrected to reduce the sensitivity of the lens to the image quality, and the angle of the incident light can be suppressed, thereby improving the telephoto effect.

The embodiment further satisfies the following relationship: 0.6<| f / R 10|<1.0 can avoid the difference of the shape change of the lens is too large, and is beneficial to the correction of the stray light at the edge of the lens, wherein the overall effective focal length of the micro telescope head is f, the radius of curvature of the image side surface of the fifth lens L5 is R10. In the present embodiment, |f/R10|=0.83, it is advantageous for the correction of the stray light at the edge of the lens. In addition, the present embodiment satisfies the following relationship: 0.8<| f 12/ f 345|<1.2 makes the refractive power of the front group lens and the rear group lens closer to the positive refractive power and the negative refractive power, indicating that the front and back groups can compensate each other, and the help is helpful. For correcting the aberration, the focal length of the front group lens is f12, and the focal length of the rear group lens is f345. In the present embodiment, |f12/f345|=0.94, which helps to correct the aberration.

The embodiment also satisfies the following relationship: TTL/f≦0.9 can effectively reduce the system volume, and contributes to the miniaturization of the micro telescope head, wherein the system length of the micro telescope head is TTL, the micro size The overall effective focal length of the telescope head is f. In the present embodiment, TTL/f = 0.84, which contributes to system miniaturization.

The embodiment also satisfies the following relationship: ATL/Gaa≦1.5 to facilitate miniaturization of the micro telescope head, wherein the overall lens thickness of the micro telescope head is ATL, and the optical axis gap length of the micro telescope head In the case of Gaa, it is preferable that the present embodiment more satisfies the following relationship: 0.8 ≦ ATL / Gaa ≦ 1.4 and in the present embodiment, ATL / Gaa = 1.31, which contributes to system miniaturization.

Furthermore, the present embodiment satisfies the following relationship: -2.5 ≦ (R9 + R10) / (R9 - R10) ≦ - 1.5 is advantageous for correcting aberrations, wherein the radius of curvature of the object side of the fifth lens L5 is R9 The curvature radius of the image side surface of the fifth lens L5 is R10. In the present embodiment, (R9+R10)/(R9-R10)=-2.16, it is advantageous to correct the aberration.

Finally, the embodiment satisfies the following relationship: (T4+T6+T8)/T6≧8, which can effectively reduce the assembly error and achieve better assembly sensitivity, wherein the image side of the second lens L2 is The distance from the side of the object of the third lens L3 is T4, the distance from the image side of the third lens L3 to the object side of the fourth lens L4 is T6, and the image side of the fourth lens L4 is to the fifth lens L5. The distance from the side of the object is T8, and preferably, the present embodiment satisfies the following relationship: 10≦(T4+T6+T8)/T6≦22 In the present embodiment, (T4+T6+T8)/T6= 13.47, so assembly errors can be reduced and better assembly sensitivity can be achieved.

Referring to FIG. 8 and FIG. 9A to FIG. 9E, the distortion diagram and the transverse light fan diagram of the third embodiment of the present invention are respectively shown. In Fig. 8, the incident light is set to 0.542 μm, and it can be seen that the distortion generated in this embodiment is less than 1.35%. In "Fig. 9A" to "Fig. 9E", the Y-axis range is between -20 m (μm) and 20 μm (μm), and the wavelength is 0.488 μm (μm), 0.542 μm (μm), Incident light of 0.6 micrometers (μm) is incident, and the aberration value produced by the present embodiment at different image heights is between 9 micrometers and 25 micrometers. Therefore, the aberration and distortion of the embodiment can be effectively corrected, and the image quality is better.

The object side surface and the image side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are all aspherical, and the materials are all plastic. Therefore, the following aspheric equations will be satisfied: Where c=l/r, r is the radius of curvature of the surface, h is the height of the light on the surface, k is the cone coefficient, A is the second-order coefficient, B is the fourth-order coefficient, and C is the sixth-order coefficient. D is the eighth-order coefficient, E is the tenth-order coefficient, F is the twelfth-order coefficient, G is the fourteenth-order coefficient, and H is the sixteenth-order coefficient.

In the embodiment, the aspheric parameters of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are as shown in Table 6:

In the first embodiment to the third embodiment, the following numerical values can be further calculated as shown in Table 7:

Regarding the symbols in the above table, the following is a unified description, where f is the focal length value of the system of the micro telescope head, R1 is the radius of curvature of the side surface of the first lens L1, and R2 is the radius of curvature of the image side of the first lens L1. R3 is the radius of curvature of the side surface of the second lens L2, R4 is the radius of curvature of the image side surface of the second lens L2, R5 is the radius of curvature of the side surface of the third lens L3, and R6 is the image side of the third lens L3. The radius of curvature, R7 is the radius of curvature of the side surface of the fourth lens L4, R8 is the radius of curvature of the image side surface of the fourth lens L4, R9 is the radius of curvature of the side surface of the fifth lens L5, and R10 is the image of the fifth lens L5 The radius of curvature of the side surface, f1 is the focal length of the first lens L1, f2 is the focal length of the second lens L2, f3 is the focal length of the third lens L3, f4 is the focal length of the fourth lens L4, and f5 is the fifth The focal length of the lens L5.

In summary, the new model has the following characteristics:

1. By having the negative refractive power of the fifth lens, the angle of the incident light can be suppressed, which helps to shorten the overall system length.

Second, satisfy the relationship: 3 < f / R 1 < 4.5, and have the effect of correcting aberrations to obtain better imaging quality.

Third, by satisfying the relationship: |f/R9|<2.6, the aberration can be effectively corrected to reduce the sensitivity of the lens to the imaging quality, and the angle of the incident light can be suppressed, thereby improving the telephoto effect.

4. By satisfying the relationship: 0.6<| f / R 10|<1.0, it is possible to avoid excessive variation of the shape of the lens and to facilitate the correction of stray light at the edge of the lens.

5. Help to correct the aberration by satisfying the relational expression: 0.8<| f 12/ f 345|<1.2.

Sixth, by satisfying the relationship: TTL/f≦0.9, the system volume can be effectively reduced, and the micro-miniature telescope head can be miniaturized.

7. By satisfying the relationship: ATL/Gaa≦1.5, the micro telescope head can be miniaturized.

8. By satisfying the relationship: -2.5≦(R9+R10)/(R9-R10)≦-1.5, it is helpful to correct the aberration.

Nine, by satisfying the relationship: (T4+T6+T8)/T6≧8, the assembly error can be effectively reduced, and better assembly sensitivity can be obtained.

10. By placing the diaphragm between the first lens and the second lens, peripheral aberrations can be suppressed, which helps to reduce the overall system length and improve imaging quality.

Therefore, the new type is highly progressive and meets the requirements for applying for a new type of patent. The application is filed according to law, and the praying office will grant the patent as soon as possible.

The present invention has been described in detail above, but the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited. That is, the equal changes and modifications made in accordance with the scope of this new application shall remain within the scope of the patent of this new type.

L1‧‧‧ first lens

L2‧‧‧ second lens

L3‧‧‧ third lens

L4‧‧‧ fourth lens

L5‧‧‧ fifth lens

S1‧‧‧ aperture

S2‧‧‧Light

10‧‧‧Filter

20‧‧‧ imaging surface

Claims (22)

A micro-miniature telescope head, which is sequentially from the object side to the image side: a first lens having positive refractive power, the object side and the image side are convex; a second lens having negative refractive power, the object side and the image side a concave surface; a third lens having a positive refractive power, the object side is a concave surface, the image side is a convex surface; a fourth lens having a negative refractive power, the object side is a concave surface; and a fifth lens having a negative refractive power, The side of the object is concave and the side is convex. A miniature telescope head, which is sequentially from the object side to the image side: a first lens having a positive refractive power, a radius of curvature of the object side surface is larger than a radius of curvature of the image side surface; and a second lens having a negative refractive power, a radius of curvature of the object side surface Less than the radius of curvature of the side surface; a third lens having positive refractive power, the radius of curvature of the object side is smaller than the radius of curvature of the side of the image, and the product of the radius of curvature of the side of the object and the radius of curvature of the image side is positive; a fourth lens having a negative refractive power The radius of curvature of the side of the object is larger than the radius of curvature of the side of the image, and the product of the radius of curvature of the side of the object and the radius of curvature of the image side is positive; and a fifth lens having a negative refractive power, the radius of curvature of the object side is larger than the radius of curvature of the side of the image, and The product of the radius of curvature of the side of the object and the radius of curvature of the image side is positive. The micro telescope head according to claim 1 or 2, further comprising an aperture disposed on a side of the first lens away from the second lens. The micro telescope head according to claim 1 or 2, further comprising a diaphragm disposed between the second lens and the third lens. The micro telescope head according to claim 1 or 2, wherein the image side of the fourth lens is convex. The micro telescope head according to claim 1 or 2, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are made of plastic. The micro telescope head according to claim 1 or 2, wherein the first lens, the second lens, the third lens, the fourth lens, and the object side and image side of the fifth lens All are aspherical. The micro telescope head according to claim 1 or 2, wherein the overall effective focal length of the micro telescope head is f, and the radius of curvature of the object side of the first lens is R1, which satisfies the following relationship. : The micro telescope head according to claim 1 or 2, wherein the overall effective focal length of the micro telescope head is f, and the radius of curvature of the side surface of the fifth lens is R9, which satisfies the following relationship. : The micro telescope head according to claim 1 or 2, wherein the overall effective focal length of the micro telescope head is f, and the curvature radius of the image side of the fifth lens is R10, which satisfies the following relationship. : The micro telescope head according to claim 1 or 2, wherein an overall focal length of the first lens and the second lens is f12, and the third lens, the fourth lens and the fifth lens The overall focal length is f345, which more satisfies the following relationship: The micro telescope head according to claim 1 or 2, wherein the system length of the micro telescope head is TTL, and the overall effective focal length of the micro telescope head is f, which satisfies the following relationship: The micro telescope head according to claim 1 or 2, wherein the micro lens of the micro telescope head has an overall lens thickness of ATL, and the optical axis gap length of the micro telescope head is Gaa, which satisfies the following relationship. : For example, the micro telescope head described in claim 13 of the patent scope satisfies the following relationship: The micro telescope head according to claim 1 or 2, wherein the radius of curvature of the side surface of the fifth lens is R9, and the radius of curvature of the image side of the fifth lens is R10, which satisfies the following relationship: formula: The micro telescope head according to claim 1 or 2, wherein a distance from an image side of the second lens to an object side of the third lens is T4, and the image side of the third lens is to the first The distance between the sides of the four lenses is T6, and the distance from the image side of the fourth lens to the side of the fifth lens is T8, which satisfies the following relationship: For example, the micro telescope head described in claim 16 of the patent application satisfies the following relationship: The micro telescope head according to claim 1 or 2, wherein a radius of curvature of the side surface of the first lens is R1, and a radius of curvature of the image side of the first lens is R2, the first lens The focal length is f1, and the overall effective focal length of the micro telescope head is f, and the following relationship is satisfied: The micro telescope head according to claim 1 or 2, wherein a radius of curvature of the side surface of the second lens is R3, and a radius of curvature of the image side of the second lens is R4, the second lens The focal length is f2, and the overall effective focal length of the micro telescope head is f, and the following relationship is satisfied: The micro telescope head according to claim 1 or 2, wherein a radius of curvature of the side surface of the third lens is R5, and a radius of curvature of the image side of the third lens is R6, the third lens The focal length is f3, and the overall effective focal length of the miniature telescope head is f, and the following relationship is satisfied: The micro telescope head according to claim 1 or 2, wherein a radius of curvature of the side surface of the fourth lens is R7, and a radius of curvature of the image side of the fourth lens is R8, the fourth lens The focal length is f4, and the overall effective focal length of the miniature telescope head is f, and the following relationship is satisfied: The micro telescope head according to claim 1 or 2, wherein a radius of curvature of the side surface of the fifth lens is R9, and a radius of curvature of the image side of the fifth lens is R10, the fifth lens The focal length is f5, and the overall effective focal length of the micro telescope head is f, and the following relationship is satisfied: