KR-20260062407-A - Optical Imaging System

KR20260062407AKR 20260062407 AKR20260062407 AKR 20260062407AKR-20260062407-A

Abstract

An imaging optical system according to embodiments of the present invention includes a first bonded lens, a second bonded lens, and a third bonded lens arranged sequentially at intervals along the optical axis from the object side, and the first bonded lens, the second bonded lens, and the third bonded lens may each have a refractive power on the object side surface and the upper side surface of a central lens formed of plastic or glass material, and may have a form in which a lens of a different material from the central lens is attached.

Inventors

조용주
이지수
허재혁

Assignees

삼성전기주식회사

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (16)

It includes a first bonding lens, a second bonding lens, and a third bonding lens arranged sequentially at intervals along the optical axis from the object side, An imaging optical system in which the first bonded lens, the second bonded lens, and the third bonded lens each have refractive power on the object-side and upper-side surfaces of a central lens formed of plastic or glass material, and have a form in which a lens of a material different from that of the central lens is attached.
In paragraph 1, An imaging optical system in which the first bonded lens has a positive refractive power, the second bonded lens has a negative refractive power, and the third bonded lens has a negative refractive power.
In paragraph 1, The first bonded lens comprises a first lens, a second lens, and a third lens arranged in order from the object side, and The second bonded lens includes a fourth lens, a fifth lens, and a sixth lens arranged in order from the object side, and The above third bonded lens includes a seventh lens, an eighth lens, and a ninth lens arranged in order from the object side, and The second lens, the fifth lens, and the eighth lens are an imaging optical system that is the central lens.
In paragraph 3, An imaging optical system in which the first lens has a negative refractive power and the second lens has a positive refractive power.
In paragraph 3, The above-mentioned fifth lens has a negative refractive power, An imaging optical system in which one of the fourth lens and the sixth lens has a positive refractive power and the other has a negative refractive power.
In paragraph 3, An imaging optical system in which one of the seventh lens and the eighth lens has a positive refractive power and the other has a negative refractive power.
In paragraph 3, An imaging optical system satisfying the condition 0 < (CT n-1 +CT n+1 )/CT n < 1 (n = 2, 5, 8). (In the above conditional equation, CT n-1 is the thickness of the n-1 lens on the optical axis, CT n is the thickness of the n lens on the optical axis, and CT n+1 is the thickness of the n+1 lens on the optical axis.)
In paragraph 3, An imaging optical system satisfying the conditions 0 ≤ |f1/v1-f2/v2| < 4 and 0 ≤ |f2/v2-f3/v3| < 4. (In the above conditional equations, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v3 is the Abbe number of the third lens)
In paragraph 3, An imaging optical system satisfying the condition 0.4 < TTL/(2ХIMG HT) < 1.0. (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.)
In paragraph 3, An imaging optical system in which the refractive index of the fifth lens among the first to ninth lenses is maximum.
In paragraph 3, The second lens, the fifth lens, and the eighth lens are all lenses made of plastic material, and The above-mentioned fifth lens is an imaging optical system made of a plastic material having optical characteristics different from those of the above-mentioned second lens and the above-mentioned eighth lens.
In Paragraph 11, The above-mentioned first to ninth lenses are an imaging optical system in which both the object-side surface and the image-side surface are aspherical.
In paragraph 3, An imaging optical system in which the second lens, the fifth lens, and the eighth lens are equipped with lenses made of glass material having different optical characteristics.
In Paragraph 13, The first lens, the second lens, and the third lens are an imaging optical system in which at least one of the object-side surface and the image-side surface is spherical.
In paragraph 1, The first bonded lens, the second bonded lens, and the third bonded lens are an imaging optical system in which the object-side surface and the image-side surface are both aspherical.
In paragraph 1, An imaging optical system satisfying the condition 1.5 < f/EPD < 2.5. (In the above conditional equation, f is the total focal length of the imaging optical system, and EPD is the diameter of the entrance pupil.)

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. 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 nine 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, an eighth lens, and a ninth 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 nine 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. Furthermore, the imaging optical system according to the embodiments of the present invention may further include an aperture for controlling the amount of light. The first, third, fourth, sixth, seventh, and ninth lenses constituting the imaging optical system according to the embodiments of the present invention may be lenses made of a polymer material (a material distinct from plastic material below) and, for example, may have adhesiveness. For example, the first lens