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KR-20260066529-A - Optical Imaging System

KR20260066529AKR 20260066529 AKR20260066529 AKR 20260066529AKR-20260066529-A

Abstract

An imaging optical system according to embodiments of the present invention comprises a first lens, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens, and a sixth lens arranged in order from the object side, and may satisfy the conditions 0.85 ≤ TTL/f ≤ 1.0 and 0.5 ≤ f1/f ≤ 1 (in the above conditions, TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging plane, f is the total focal length of the imaging optical system, and f1 is the focal length of the first lens).

Inventors

  • 조성일
  • 김학철
  • 임태연
  • 김병현

Assignees

  • 삼성전기주식회사

Dates

Publication Date
20260512
Application Date
20241104

Claims (16)

  1. It includes a first lens, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens, and a sixth lens arranged in order from the object side, An imaging optical system satisfying the conditions 0.85 ≤ TTL/f ≤ 1.0 and 0.5 ≤ f1/f ≤ 1. (In the above conditional equations, TTL is the distance along the optical axis from the object-side surface of the first lens to the imaging plane, f is the total focal length of the imaging optical system, and f1 is the focal length of the first lens.)
  2. In paragraph 1, An imaging optical system in which the upper surface of the third lens is concave and the object-side surface of the fourth lens is convex.
  3. In paragraph 1, An imaging optical system in which the first lens and the second lens are dicut lenses.
  4. In paragraph 1, An imaging optical system in which the upper surface of the fifth lens is convex and the object-side surface of the sixth lens is convex.
  5. In paragraph 1, An imaging optical system satisfying the condition 100 ≤ (v1+v3) ≤ 120. (In the above conditional equation, v1 is the Abbe number of the first lens, and v3 is the Abbe number of the third lens.)
  6. In paragraph 1, An imaging optical system satisfying the condition 0.8 ≤ R1/R5 ≤ 1.2. (In the above conditional equation, R1 is the radius of curvature of the object-side surface of the first lens, and R5 is the radius of curvature of the object-side surface of the third lens.)
  7. In paragraph 1, An imaging optical system satisfying the condition 0.2 < IMG HT/EPD ≤ 0.4. (In the above conditional equation, IMG HT is half the diagonal length of the imaging plane, and EPD is the diameter of the entrance pupil.)
  8. In paragraph 1, An imaging optical system satisfying the condition 0.2 ≤ (CT1+CT2+CT3+CT4)/f ≤ 0.5. (In the above conditional equation, CT1 is the thickness on the optical axis of the first lens, CT2 is the thickness on the optical axis of the second lens, CT3 is the thickness on the optical axis of the third lens, and CT4 is the thickness on the optical axis of the fourth lens.)
  9. In paragraph 1, An imaging optical system satisfying the condition 0.2 ≤ D45/Td ≤ 0.4. (In the above conditional equation, D45 is the optical axis distance from the upper surface of the fourth lens to the object side surface of the fifth lens, and Td is the optical axis distance from the object side surface of the first lens to the upper surface of the sixth lens.)
  10. It includes a first lens, a second lens, a third lens having a positive refractive power and a concave shape on the upper surface, a fourth lens having a negative refractive power and a convex shape on the object side surface, a fifth lens, and a sixth lens having a convex shape on the object side surface, arranged in order from the object side. An imaging optical system satisfying the conditions 1.7 < F-number < 2.0 and 0.2 < IMG HT/EPD ≤ 0.4. (In the above conditional equations, IMG HT is half the diagonal length of the imaging plane, and EPD is the diameter of the entrance pupil.)
  11. In Paragraph 10, An imaging optical system in which the first to sixth lenses are spaced apart along the optical axis, and the distance between the fourth lens and the fifth lens among adjacent lenses is maximum.
  12. In Paragraph 10, An imaging optical system satisfying the condition 0.2 ≤ D45/Td ≤ 0.4. (In the above conditional equation, D45 is the optical axis distance from the upper surface of the fourth lens to the object side surface of the fifth lens, and Td is the optical axis distance from the object side surface of the first lens to the upper surface of the sixth lens.)
  13. In Paragraph 10, An imaging optical system satisfying the condition 0.8 ≤ R1/R5 ≤ 1.2. (In the above conditional equation, R1 is the radius of curvature of the object-side surface of the first lens, and R5 is the radius of curvature of the object-side surface of the third lens.)
  14. In Paragraph 10, An imaging optical system satisfying the condition 0.2 ≤ (CT1+CT2+CT3+CT4)/f ≤ 0.5. (In the above conditional equation, CT1 is the thickness on the optical axis of the first lens, CT2 is the thickness on the optical axis of the second lens, CT3 is the thickness on the optical axis of the third lens, CT4 is the thickness on the optical axis of the fourth lens, and f is the total focal length of the imaging optical system)
  15. In Paragraph 10, It further includes an optical path conversion means disposed on the object side of the first lens, and An imaging optical system comprising one or more dicut lenses.
  16. In Paragraph 10, An imaging optical system in which the fifth lens has a positive refractive power and the sixth lens has a negative refractive power.

Description

Optical Imaging System The present invention relates to an imaging optical system. Recently, folded camera modules that bend the path of light by placing a reflective element, such as a prism, in front of the lens are being adopted in portable terminals. Folded camera modules can be extended in overall length, so they are utilized in telephoto cameras with relatively long focal lengths. In general, telephoto cameras have the disadvantage of lower resolution compared to wide-angle cameras and are less suitable for shooting in low-light environments. These drawbacks are particularly pronounced when shooting at high magnification. FIG. 1a is a diagram showing the configuration of an imaging optical system according to a first embodiment of the present invention. Figure 1b is a diagram showing the aberration characteristics of the imaging optical system illustrated in Figure 1a. FIG. 2a is a configuration diagram of an imaging optical system according to a second embodiment of the present invention. FIG. 2b is a diagram showing the aberration characteristics of the imaging optical system illustrated in FIG. 2a. FIG. 3a is a configuration diagram of an imaging optical system according to a third embodiment of the present invention. Figure 3b is a diagram showing the aberration characteristics of the imaging optical system illustrated in Figure 3a. FIG. 4a is a configuration diagram of an imaging optical system according to a fourth embodiment of the present invention. Figure 4b is a diagram showing the aberration characteristics of the imaging optical system illustrated in Figure 4a. FIG. 5a is a configuration diagram of an imaging optical system according to the fifth embodiment of the present invention. Figure 5b is a diagram showing the aberration characteristics of the imaging optical system illustrated in Figure 5a. FIG. 6a is a configuration diagram of an imaging optical system according to the sixth embodiment of the present invention. Figure 6b is a diagram showing the aberration characteristics of the imaging optical system illustrated in Figure 6a. FIG. 7a is a configuration diagram of an imaging optical system according to the seventh embodiment of the present invention. Figure 7b is a diagram showing the aberration characteristics of the imaging optical system illustrated in Figure 7a. FIG. 8a is a configuration diagram of an imaging optical system according to the eighth embodiment of the present invention. Figure 8b is a diagram showing the aberration characteristics of the imaging optical system illustrated in Figure 8a. FIG. 9a is a configuration diagram of an imaging optical system according to the ninth embodiment of the present invention. Figure 9b is a diagram showing the aberration characteristics of the imaging optical system illustrated in Figure 9a. Embodiments of the present invention will be described in detail below with reference to the attached drawings. However, the scope of the present invention is not limited to the embodiments presented. For example, a person skilled in the art who understands the concept of the present invention may easily propose other embodiments included within the scope of the concept of the present invention by adding, changing, or deleting components, and such embodiments shall also be considered to be included within the scope of the concept of the present invention. Furthermore, throughout the specification, the term 'comprising' a component means that, unless specifically stated otherwise, it does not exclude other components but rather allows for the inclusion of additional components. In the optical system configuration diagrams attached to this specification, the thickness, size, and shape of the lenses are depicted somewhat exaggerated for illustrative purposes, and in particular, the spherical or aspherical shapes presented in the configuration diagrams are merely examples and are not limited to these shapes. In this specification, the first lens refers to the lens closest to the object side, and the eighth lens refers to the lens closest to the imaging plane (or image sensor). Additionally, in this specification, the units for the radius of curvature (Radius), thickness (Thickness), distance (Distance), focal length (Focal Length), etc. of the lens are mm, and the unit for the field of view (FOV) is degrees. Furthermore, in the description of the lens shape, a convex shape means that the paraxial region (a very narrow area near the optical axis) of that surface is convex, and a concave shape means that the paraxial region of that surface is concave. Therefore, even if a lens is described as having a convex shape, the edge of the lens may be concave, and similarly, even if a lens is described as having a concave shape, the edge of the lens may be convex. An imaging optical system according to embodiments of the present invention may include six lenses. For example, an imaging optical system according to embodiments of the present invention may incl