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KR-20260062396-A - Optical Imaging System

KR20260062396AKR 20260062396 AKR20260062396 AKR 20260062396AKR-20260062396-A

Abstract

An imaging optical system according to embodiments of the present invention is arranged in order from the object side and includes a first lens having a refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein the first lens and the second lens form a bonded lens and can satisfy the condition 0 ≤ |f1/v1-f2/v2| < 3 (wherein f1 is the focal length of the first lens, v1 is the Abbe number of the first lens, f2 is the focal length of the second lens, and v2 is the Abbe number of the second lens).

Inventors

  • 이지수
  • 허재혁
  • 조용주

Assignees

  • 삼성전기주식회사

Dates

Publication Date
20260507
Application Date
20241029

Claims (16)

  1. Arranged in order from the object side, the lenses include a first lens having a refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens and the second lens form a bonded lens, An imaging optical system satisfying the condition 0 ≤ |f1/v1-f2/v2| < 3. (In the above conditional equation, f1 is the focal length of the first lens, v1 is the Abbe number of the first lens, f2 is the focal length of the second lens, and v2 is the Abbe number of the second lens)
  2. In paragraph 1, An imaging optical system in which the first lens is formed of a material with a smaller Abbe number than the second lens.
  3. In paragraph 1, An imaging optical system in which the first lens is formed of a material with a higher refractive index than the second lens.
  4. In paragraph 1, The above third lens is an imaging optical system in which the object-side surface is convex and the upper-side surface is concave.
  5. In paragraph 1, An imaging optical system in which the fourth lens has a convex shape on the object side surface and the sixth lens has a concave shape on the upper side surface.
  6. In paragraph 1, The above seventh lens is an imaging optical system having a positive refractive power and an object-side surface that is convex.
  7. In paragraph 1, The above-mentioned eighth lens is an imaging optical system having negative refractive power and an object-side surface that is convex.
  8. In paragraph 1, An imaging optical system satisfying condition 1 < TTL/f < 1.3. (In the above conditional equation, f is the total focal length of the imaging optical system, and TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging plane.)
  9. In paragraph 1, An imaging optical system satisfying the condition 0.5 < TTL/(2ХIMG HT) < 0.8. (In the above conditional equation, IMG HT is half the diagonal length of the imaging plane, and TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging plane.)
  10. It includes 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 arranged in order from the object side, The first lens and the second lens form a bonded lens, An imaging optical system satisfying one or more of the conditions v1-v2 < 0 and 0 < n1-n2. (In the above conditional equations, v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, n1 is the refractive index of the first lens, and n2 is the refractive index of the second lens.)
  11. In Paragraph 10, An imaging optical system satisfying the condition 0 < f2/f < 2. (In the above conditional equation, f is the total focal length of the imaging optical system, and f2 is the focal length of the second lens.)
  12. In Paragraph 10, An imaging optical system satisfying the condition -5 < f3/f < -1. (In the above conditional equation, f is the total focal length of the imaging optical system, and f3 is the focal length of the third lens.)
  13. In Paragraph 10, An imaging optical system satisfying the condition -10 < f4/f/100 < 1. (In the above conditional equation, f is the total focal length of the imaging optical system, and f4 is the focal length of the fourth lens.)
  14. In Paragraph 10, An imaging optical system satisfying the condition -5 < f5/f/100 < 1. (In the above conditional equation, f is the total focal length of the imaging optical system, and f5 is the focal length of the fifth lens.)
  15. In Paragraph 10, An imaging optical system satisfying the condition 0 < f7/f < 2. (In the above conditional equation, f is the total focal length of the imaging optical system, and f7 is the focal length of the seventh lens.)
  16. In Paragraph 10, An imaging optical system satisfying the condition -2 < f8/f < 0. (In the above conditional equation, f is the total focal length of the imaging optical system, and f8 is the focal length of the eighth lens.)

Description

Optical Imaging System The present invention relates to an imaging optical system. Recent mobile terminals are equipped with a camera that includes an imaging optical system composed of multiple lenses to enable video calls and photo shooting. Furthermore, as the function of cameras in mobile devices gradually increases, the demand for high-resolution cameras for mobile devices is growing. In particular, recently, image sensors with high pixel counts (e.g., 13 million to 200 million pixels) are being adopted in cameras for mobile devices to achieve clearer image quality. In addition, as mobile devices are becoming increasingly smaller, cameras for mobile devices are also required to be slim, so there is a need to develop an imaging optical system that can achieve high resolution while being slim. 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. 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 eight lenses. For example, an imaging optical system according to embodiments of the present invention may include 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 arranged in order from the object side. However, the imaging optical system according to the embodiments of the present invention is not composed solely of eight lenses and may include other components as needed. For example, the imaging optical system according to the embodiments of the present invention may further include an image sensor that converts light from an incident subject into an electrical signal. Additionally, the imaging optical system according to the embodiments of the present invention may further include an infrared blocking filter (hereinafter referred to as a filter) that blocks light in the infrared region incident on the image sensor. Furth