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CN-119856093-B - Zoom lens and imaging device provided with same

CN119856093BCN 119856093 BCN119856093 BCN 119856093BCN-119856093-B

Abstract

A zoom lens (1) is provided with a first optical element group (G1), a second optical element group (G2), and a third optical element group (G3) which are arranged in order from an object side to an image side, wherein the first optical element group (G1) has a lens group (10) and an optical element (15) which bends an optical axis (C), the second optical element group (G2) has a negative refractive power, the third optical element group (G3) has a positive refractive power, the lens group (10) has a positive refractive power, and the second optical element group (G2) and the third optical element group (G3) are arranged closer to the object side than the optical element (15), and the second optical element group (G2) and the third optical element group (G3) are configured to be movable along the optical axis (C), respectively, so that the zoom lens (1) changes magnification from a wide angle end to a telephoto end.

Inventors

  • CHEN YONGHUA

Assignees

  • 北京小米移动软件有限公司

Dates

Publication Date
20260508
Application Date
20230706

Claims (10)

  1. 1. A zoom lens, wherein, The zoom lens is composed of a first optical element group, a second optical element group, and a third optical element group which are sequentially arranged from an object side to an image side, The first optical element group has a lens group composed of at least one lens, and an optical element bending an optical axis, The second optical element group is composed of at least one lens, and has a negative refractive power, The third optical element group is constituted by at least one lens, and has a positive refractive power, The lens group has positive refractive power and is disposed closer to the object side than the optical element, The second optical element group and the third optical element group are configured to be movable along the optical axis, respectively, so that the zoom lens changes magnification between a wide-angle end and a telephoto end, Wherein, when the focal length of the first optical element group is defined as f1 and the focal length of the whole optical system at the time of infinity focusing at the telephoto end is defined as ft, the following is satisfied: 0.5≤f1/ft≤6。
  2. 2. The zoom lens of claim 1, wherein, When the distance on the optical axis from the surface closest to the object side of the first optical element group to the surface closest to the object side of the second optical element group is defined as D12, and the distance on the optical axis from the surface closest to the object side of the first optical element group to the image surface is defined as TTL, the following is satisfied: 0.2≤D12/TTL≤0.7。
  3. 3. the zoom lens according to claim 1 or 2, wherein, The focal length of the third optical element group is defined as f3, the focal length of the entire optical system at the time of infinity focusing at the wide angle end is defined as fw, and the focal length of the entire optical system at the time of infinity focusing at the telephoto end is defined as ft, satisfying: 0.2≤f3/√(fw×ft)≤1.1。
  4. 4. the zoom lens according to claim 1 or 2, wherein, When the focal length of the second optical element group is defined as f2 and the focal length of the entire optical system at the time of infinity focusing at the telephoto end is defined as ft, the following is satisfied: 0.2≤|f2/ft|≤1.0。
  5. 5. the zoom lens according to claim 1 or 2, wherein, The maximum effective diameter h23 of the light passing range in the second optical element group and the third optical element group is 9mm or less.
  6. 6. The zoom lens according to claim 1 or 2, wherein, The distance on the optical axis from the surface closest to the object side of the first optical element group to the image surface is 40mm or less.
  7. 7. The zoom lens according to claim 1 or 2, wherein, The zoom lens includes an aperture for adjusting the amount of light passing therethrough, The aperture is disposed between a surface of the first optical element group on the image side and a surface of the third optical element group closest to the object side.
  8. 8. The zoom lens according to claim 1 or 2, wherein, At least one surface of at least one lens in the third optical element group is an aspherical surface.
  9. 9. The zoom lens according to claim 1 or 2, wherein, At least one lens in the third optical element group is composed of plastic.
  10. 10. A photographing apparatus, wherein, The imaging device is provided with: the zoom lens according to any one of claims 1 to 9, and And an imaging element which is disposed at an image plane position of the zoom lens and converts a formed optical image into an electrical signal.

Description

Zoom lens and imaging device provided with same Technical Field The present invention relates to a zoom lens including a plurality of optical element groups, and an imaging device including the zoom lens. Background Conventionally, various zoom lenses including an optical element having a bent optical axis are known. For example, a zoom lens described in japanese patent application laid-open No. 2007-34064 includes a first lens group including a first lens having a negative refractive power, and a prism bending an optical axis, a second lens group including two lenses, and a third lens group including three lenses, which are arranged in order from an object side to an image side. In the first lens group of the zoom lens, a first lens having a negative refractive power is disposed on the object side of the prism. In this zoom lens, although the size of the incident direction of light from the object can be reduced (i.e., thinned), the F value at the wide angle end is about F28, and the large aperture cannot be said to be sufficient. In the zoom lens described in WO2021/085154A1, a prism is disposed on the object side of the lens group, that is, the prism is disposed closest to the object side. In this zoom lens, although the size of the incident direction of light can be reduced, a sufficient size cannot be ensured in the maximum diameter of the first lens group obtained by the focal length (EFL)/F value, and it is difficult to realize a large aperture. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2007-34064 Patent document 2 International publication WO2021/085154A1 Disclosure of Invention Problems to be solved by the invention Accordingly, an object of the present invention is to provide a zoom lens capable of being disposed in a thin imaging device and having a large aperture and capable of taking a long-focus image, and an imaging device provided with the zoom lens. Solution for solving the problem The zoom lens of the present invention includes a first optical element group, a second optical element group, and a third optical element group arranged in order from an object side to an image side, The first optical element group has a lens group including at least one lens, and an optical element bending an optical axis, The second optical element group includes at least one lens, and has a negative refractive power, The third optical element group includes at least one lens, and has a positive refractive power, The lens group has positive refractive power and is disposed closer to the object side than the optical element, The second optical element group and the third optical element group are configured to be movable along the optical axis, respectively, so that the zoom lens changes magnification between a wide-angle end and a telephoto end. In the case of the zoom lens described above, When the focal length of the first lens group is defined as f1 and the focal length of the entire optical system at the time of infinity focusing at the telephoto end is defined as ft, it is possible to satisfy: 0.5≤f1/ft≤6。 in addition, in the zoom lens, When the distance on the optical axis from the surface closest to the object side of the first optical element group to the surface closest to the object side of the second optical element group is defined as D12 and the distance on the optical axis from the surface closest to the object side of the first optical element group to the image surface is defined as TTL, it is possible to satisfy: 0.2≤D12/TTL≤0.7。 in addition, in the zoom lens, When the focal length of the third optical element group is defined as f3, the focal length of the entire optical system at the time of infinity focusing at the wide angle end is defined as fw, and the focal length of the entire optical system at the time of infinity focusing at the telephoto end is defined as ft, it is possible to satisfy: 0.2≤f3/√(fw×ft)≤1.1。 in addition, in the zoom lens, When the focal length of the second optical element group is defined as f2 and the focal length of the entire optical system at the time of infinity focusing at the telephoto end is defined as ft, it is possible to satisfy: 0.2≤|f2/ft|≤1.0。 in addition, in the zoom lens, The maximum effective diameter h23 of the light passing range in the second optical element group and the third optical element group may be 9mm or less. In addition, in the zoom lens, The distance on the optical axis from the surface closest to the object side of the first optical element group to the image surface may be 40mm or less. The zoom lens may further include an aperture for adjusting the amount of light passing therethrough, The aperture is disposed between a surface of the first optical element group on the image side and a surface of the third optical element group closest to the object side. In addition, in the zoom lens, At least one surface of at least one lens in the third optical element group may be an aspherical surfac