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CN-121995604-A - Distance-increasing lens and imaging system

CN121995604ACN 121995604 ACN121995604 ACN 121995604ACN-121995604-A

Abstract

The invention discloses a range-increasing lens and an imaging system, and relates to the technical field of photography. The distance increasing lens comprises a shell, a first lens group and a second lens group, wherein the first lens group and the second lens group are positioned in the shell, the first lens group and the second lens group are sequentially arranged from an object plane to an image plane along an optical axis, the first lens group has positive focal power, the second lens group has negative focal power, the total focal length of the distance increasing lens is the difference between the absolute value of the positive focal power of the first lens group and the absolute value of the negative focal power of the second lens group, and the first lens group can reciprocate along the optical axis relatively to realize focusing. The distance-increasing lens and the imaging system can reduce the total optical length of the lens and improve the imaging quality.

Inventors

  • REN ZHIHUI
  • WU XINMIN

Assignees

  • 深圳拜波赫技术有限公司

Dates

Publication Date
20260508
Application Date
20260408

Claims (10)

  1. 1. The lens comprises a shell, a first lens group and a second lens group, wherein the first lens group and the second lens group are positioned in the shell, the first lens group and the second lens group are sequentially arranged from an object plane to an image plane along an optical axis, the first lens group has positive focal power, the second lens group has negative focal power, the total focal length of the lens is the difference between the absolute value of the positive focal power of the first lens group and the absolute value of the negative focal power of the second lens group, and the first lens group can reciprocate along the optical axis relative to the second lens group to realize focusing; The first lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, wherein the first lens, the second lens, the third lens, the fifth lens and the eighth lens are positive focal power lenses, the fourth lens, the sixth lens and the seventh lens are negative focal power lenses, the third lens and the fourth lens are bonded to form a first bonding lens with negative focal power, the fifth lens and the sixth lens are bonded to form a second bonding lens with positive focal power, and the seventh lens and the eighth lens are bonded to form a third bonding lens with positive focal power; the second lens group comprises a ninth lens, a tenth lens, an eleventh lens and a twelfth lens, wherein the tenth lens and the twelfth lens are positive focal power lenses, the ninth lens and the eleventh lens are negative focal power lenses, and the tenth lens and the eleventh lens are bonded to form a fourth bonding lens with negative focal power.
  2. 2. The extended lens of claim 1, wherein the first lens group has a power of ΦI and the second lens group has a power of ΦII, satisfying the following relationship of-0.4 < ΦI/ΦII < -0.3.
  3. 3. The zoom lens according to claim 1, wherein the Abbe number of the fifth lens is Vd5 and the Abbe number of the sixth lens is Vd6, satisfying the following relation 50< Vd5-Vd6<60.
  4. 4. The zoom lens according to claim 1, wherein the refractive index of the seventh lens is Nd7, the refractive index of the eighth lens is Nd8, and the following relation is 0.1< Nd7-Nd8<0.25.
  5. 5. The macro lens of claim 1, wherein the fourth cemented lens has a power of Φj4 and the second lens group has a power of ΦII, satisfying the following relationship 0.8< Φj4/ΦII <1.2.
  6. 6. The zoom lens according to claim 1, wherein the total diameter of the first lens element is DM1, and the distance from the object side surface of the first lens element to the object side surface of the second lens element is TH1, satisfying the following relation 3< DM1/TH1<4.
  7. 7. The macro lens of claim 6, wherein the macro lens has an optical total length of less than 60mm.
  8. 8. The zoom lens of claim 1, wherein the first lens has a full aperture DM1 and the twelfth lens has a full aperture DM12, satisfying the following relation 5< DM1/DM12<5.6.
  9. 9. The macro lens of claim 8 wherein the first lens has a full aperture DM1 of less than 44mm.
  10. 10. An imaging system comprising a range finder lens according to any one of claims 1-9, the imaging system further comprising an imaging lens, the range finder lens and the imaging lens being arranged in order along an optical axis from an object plane to an image plane.

Description

Distance-increasing lens and imaging system Technical Field The invention relates to the technical field of photography, in particular to a range-increasing lens and an imaging system. Background The external lens of the mobile phone, in particular to the distance-increasing lens, is mainly used for expanding the focal length of mobile phone photography, so that a user can clearly capture picture details in long-distance shooting scenes such as a concert, the working principle of the mobile phone is similar to that of a telescope, and the long-distance shooting effect is improved through the amplifying effect. Currently, the external lenses of mobile phones on the market are mainly divided into two types: The universal mobile phone external lens has the advantages of being capable of adapting to mobile phone lenses of different brands and models and high in compatibility. However, due to the lack of a targeted design, such lenses often have some adverse effects on the relative illuminance, chromatic aberration, resolution, and distortion control of the picture when imaged. The special mobile phone is externally connected with the lens, and the lens is usually matched with the specific mobile phone lens, so that the optical quality is better, and the original image quality can be maintained under the premise of not losing relative illumination, chromatic aberration, analytic force and distortion control. But has the disadvantage that the lens size is generally large and the portability is poor. Disclosure of Invention The invention mainly aims to provide a distance-increasing lens, which aims to reduce the total optical length of the lens and improve the imaging quality. In order to achieve the above object, the present invention provides a lens assembly comprising a housing, a first lens group and a second lens group, wherein the first lens group and the second lens group are located in the housing, and the first lens group and the second lens group are sequentially arranged from an object plane to an image plane along an optical axis, the first lens group has positive focal power, the second lens group has negative focal power, and the total focal length of the lens assembly is the difference between the absolute value of the positive focal power of the first lens group and the absolute value of the negative focal power of the second lens group, and the first lens group can reciprocate along the optical axis relative to the second lens group to realize focusing; The first lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, wherein the first lens, the second lens, the third lens, the fifth lens and the eighth lens are positive focal power lenses, the fourth lens, the sixth lens and the seventh lens are negative focal power lenses, the third lens and the fourth lens are bonded to form a first bonding lens with negative focal power, the fifth lens and the sixth lens are bonded to form a second bonding lens with positive focal power, and the seventh lens and the eighth lens are bonded to form a third bonding lens with positive focal power; the second lens group comprises a ninth lens, a tenth lens, an eleventh lens and a twelfth lens, wherein the tenth lens and the twelfth lens are positive focal power lenses, the ninth lens and the eleventh lens are negative focal power lenses, and the tenth lens and the eleventh lens are bonded to form a fourth bonding lens with negative focal power. In one embodiment, the first lens group has optical power of phi I, and the second lens group has optical power of phi II, and the following relation is satisfied, namely-0.4 < phi I/phi II < -0.3. In one embodiment, the Abbe number of the fifth lens is Vd5, the Abbe number of the sixth lens is Vd6, and the following relation is 50< Vd5-Vd6<60. In one embodiment, the refractive index of the seventh lens is Nd7, the refractive index of the eighth lens is Nd8, and the following relation is 0.1< Nd7-Nd8<0.25. In one embodiment, the fourth cemented lens has optical power of Φj4, the second lens group has optical power of ΦII, and the following relationship is satisfied, namely 0.8< Φj4/ΦII <1.2. In one embodiment, the total aperture of the first lens is DM1, the distance from the object side surface of the first lens to the object side surface of the second lens is TH1, and the following relation is 3< DM1/TH1<4. In one embodiment, the total optical length of the macro lens is less than 60mm. In one embodiment, the full aperture of the first lens is DM1, the full aperture of the twelfth lens is DM12, and the following relation is 5< DM1/DM12<5.6. In one embodiment, the first lens has a full aperture DM1 of less than 44mm. The invention also provides an imaging system which comprises the distance increasing lens, and the imaging system further comprises the imaging lens, wherein the distance increasing lens and the imaging lens are sequentially