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CN-122029469-A - Lens assembly and electronic device comprising same

CN122029469ACN 122029469 ACN122029469 ACN 122029469ACN-122029469-A

Abstract

According to an embodiment of the present disclosure, an electronic device may be provided. The electronic device may include a lens assembly. The lens assembly may include a lens group including a first lens, a second lens, a third lens, and a fourth lens sequentially arranged along an optical axis (O-I) in a direction from an object side to an image side, an aperture, and an image sensor including an imaging surface (img) on which an image (I) is formed. The first lens may have a positive refractive power, the second lens may have a negative refractive power, the third lens may protrude toward the image side, and the fourth lens may have a negative refractive power. Various other embodiments are also possible.

Inventors

  • Jin Menjun

Assignees

  • 三星电子株式会社

Dates

Publication Date
20260512
Application Date
20241024
Priority Date
20231024

Claims (15)

  1. 1. An electronic device (101), comprising: A lens assembly (400; 500;600;700; 800) comprising: A lens group including a first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4) sequentially arranged along an optical axis (O-I) in a direction from an object (O) side to an image (I) side; aperture (stop); and An Image Sensor (IS) comprising an imaging surface (img) on which an image (I) IS formed, Wherein the first lens has positive refractive power, the second lens has negative refractive power, the third lens has a convex shape toward the image side, the fourth lens has negative refractive power, and Wherein the lens assembly satisfies the following [ formula 1] to [ formula 4], [ Formula 1] IH≥2.8mm [ Formula 2] TTL-ASL≤0.01mm [ Formula 3] L2MED/L1S1ED≤1.05 [ Equation 4] f/EPD≤2.5 (Wherein in [ formula 1], IH is half the diagonal length of the image sensor, TTL in [ formula 2] is the distance from the object side surface (S3) of the first lens to the imaging surface of the image sensor, ASL is the distance from the aperture to the imaging surface of the image sensor, in [ formula 3], L1S1ED is the effective diameter of the object side surface (S3) of the first lens, L2MED is the larger of the effective diameter of the object side surface (S5) of the second lens and the effective diameter of the surface of the image side surface (S6) of the second lens, in [ formula 4], f is the combined focal length of the lens assembly, EPD is the entrance pupil).
  2. 2. The electronic device of claim 1, wherein the lens assembly satisfies the following [ formula 5], [ Equation 5] 17<V2<25 (Wherein V2 in [ formula 5] is the Abbe number of the second lens at a wavelength of 587.6 nm).
  3. 3. Electronic device according to claim 1 or 2, wherein the object side surface (S3) of the first lens has a convex shape towards the object side.
  4. 4. The electronic device according to any one of claims 1 to 3, wherein the lens assembly satisfies the following [ formula 6], [ Formula 6] N2≥1.66 (Wherein N2 in [ formula 6] is the refractive index of the second lens at a wavelength of 587.6 nm).
  5. 5. The electronic device according to any one of claims 1 to 4, wherein the lens assembly satisfies the following [ formula 7], [ Formula 7] N1≤1.6 (Wherein N2 in [ formula 7] is the refractive index of the second lens at a wavelength of 587.6 nm).
  6. 6. The electronic device according to any one of claims 1 to 5, wherein the lens assembly satisfies the following [ formula 8], [ Formula 8] N4≤1.6 (Wherein N4 in [ formula 8] is the refractive index of the fourth lens at a wavelength of 587.6 nm).
  7. 7. The electronic device according to any one of claims 1 to 6, wherein the second lens has a negative refractive power and satisfies the following [ formula 9], [ Formula 9] CT2≥0.15mm (Wherein CT2 in [ formula 9] is the center thickness of the second lens).
  8. 8. The electronic device according to any one of claims 1 to 7, wherein the second lens has a negative refractive power, and an image side surface (S6) of the second lens has a concave shape toward the image side.
  9. 9. The electronic device according to any one of claims 1 to 8, wherein at least one of an object side surface (S9) or an image side surface (S10) of the fourth lens is formed to have at least one inflection point.
  10. 10. The electronic device according to any one of claims 1 to 9, wherein the lens assembly satisfies the following [ formula 10], [ Formula 10] SD/TTL≤0.9 (Wherein SD in [ formula 10] is the distance from the object side surface (S3) of the first lens to the image side surface (S10) of the fourth lens, and TTL is the distance from the object side surface (S3) of the first lens to the imaging surface of the image sensor).
  11. 11. The electronic device according to any one of claims 1 to 10, wherein the lens assembly satisfies the following [ formula 11], [ Formula 11] 1.0≤TTL/f (Wherein TTL in [ formula 11] is a distance from an object side surface (S3) of the first lens to the imaging surface of the image sensor, and f is a combined focal length of the lens assembly).
  12. 12. The electronic device according to any of claims 1 to 11, further comprising a display (201, 301) comprising a through hole (341), and Wherein at least a part of the second lens (L2) and the first lens (L1) are disposed in the through hole.
  13. 13. The electronic device of claim 12, wherein the display (201; 301) further comprises a support panel (330), a display panel (320) disposed on a first direction facing surface of the support panel, and a cover glass (310) disposed on a first direction facing surface of the display panel.
  14. 14. The electronic device according to claim 13, wherein the through hole is formed through a surface of the support panel facing in a second direction opposite to the first direction to a surface of the display panel facing in the first direction.
  15. 15. The electronic device according to any of claims 1-14, wherein the aperture is arranged facing an object side surface (S3) of the first lens.

Description

Lens assembly and electronic device comprising same Technical Field Examples disclosed herein relate to a lens assembly and an electronic device including the same. Background Optical devices (e.g., cameras capable of capturing images or video) have been widely used. Conventionally, a film type optical device is mainly used, but in recent years, digital cameras or video cameras having solid-state image sensors such as Charge Coupled Devices (CCDs) or Complementary Metal Oxide Semiconductors (CMOS) have been widely distributed. Optical devices employing solid-state image sensors (CCDs or CMOS) are increasingly replacing film-type optical devices because it is easier to store, copy, and move images than film-type optical devices. In order to obtain high quality images and/or video, the optical device may include a lens assembly (or optical system) including a plurality of lenses and an image sensor having a high pixel count. The lens assembly can obtain high quality (high resolution) images and/or video by having, for example, a low F-number (Fno) and less aberrations. In order to obtain a low F-number (Fno) with little aberration, in other words, to obtain a bright and high resolution image, a plurality of lenses need to be combined. As the number of pixels included in the image sensor increases, the number of pixels of the image sensor becomes higher, and the image sensor having the higher number of pixels can obtain a high definition (high resolution) image and/or video. In order to realize a high-pixel image sensor in a limited installation space within an electronic device, a plurality of very small pixels, for example, micrometer-sized pixels, may be arranged. Recently, image sensors including tens to hundreds of millions of micrometers of pixels have also been installed in portable electronic devices such as smartphones and tablet PCs. Such high performance optical devices may have the effect of enticing a user to purchase an electronic device. For the purpose of aiding in the understanding of the present disclosure, the above information may be provided as related art. No statement or determination is made as to whether any of the foregoing is applicable as prior art to the present disclosure. Disclosure of Invention [ Technical solution ] Embodiments of the present disclosure may provide an electronic device. The electronic device may include a lens assembly. The lens assembly may include a lens group including a first lens, a second lens, a third lens, and a fourth lens sequentially arranged along an optical axis O-I in a direction from an object side to an image side, an aperture, and an image sensor including an imaging surface (img) on which an image (I) is formed. The first lens may have a positive refractive power, the second lens may have a negative refractive power, the third lens may have a convex shape toward the image side, and the fourth lens may have a negative refractive power, and the lens assembly may satisfy the following [ formula 1] to [ formula 4], [ Formula 1] IH≥2.8mm [ Formula 2] TTL-ASL≤0.01mm [ Formula 3] L2MED/L1S1ED≤1.05 [ Equation 4] f/EPD≤2.5 (Wherein IH is half the diagonal length of the image sensor in [ formula 1], TTL is the distance from the object side surface S3 of the first lens to the imaging surface of the image sensor in [ formula 2], ASL is the distance from the aperture to the imaging surface of the image sensor, L1S1ED is the effective diameter of the object side surface S3 of the first lens in [ formula 3], L2MED is the larger of the effective diameter of the object side surface S5 of the second lens and the effective diameter of the surface of the image side surface S6 of the second lens in [ formula 4], f is the combined focal length of the lens assembly, and EPD is the entrance pupil). Embodiments of the present disclosure may provide a lens assembly. The lens assembly may include a lens group including a first lens, a second lens, a third lens, and a fourth lens sequentially arranged along an optical axis O-I in a direction from an object side to an image side, an aperture stop, and an image sensor IS including an imaging surface img on which an image I IS formed. The first lens has positive refractive power, the object side surface S3 of the first lens has a convex shape toward the object, the second lens has negative refractive power, the third lens has a convex shape toward the image side, the fourth lens has negative refractive power, the lens assembly can satisfy the following [ formula 1] to [ formula 4], [ Formula 1] IH≥2.8mm [ Formula 2] TTL-ASL≤0.01mm [ Formula 3] L2MED/L1S1ED≤1.05 [ Equation 4] f/EPD≤2.5 (Wherein IH is half the diagonal length of the image sensor in [ formula 1], TTL is the distance from the object side surface S3 of the first lens to the imaging surface of the image sensor in [ formula 2], ASL is the distance from the aperture to the imaging surface of the image sensor, L1S1ED is the effective diameter of the object side surf