KR-20260066360-A - OPTICAL SYSTEM AND CAMERA MODULE

KR20260066360AKR 20260066360 AKR20260066360 AKR 20260066360AKR-20260066360-A

Abstract

An optical system according to an embodiment of the present invention comprises first to fifth lens groups arranged along an optical axis, wherein the first lens group has a positive (+) refractive power, the second lens group has a negative (-) refractive power, the third lens group has a positive (+) refractive power, the fourth lens group has a negative (-) refractive power, and the fifth lens group has a positive (+) refractive power, and the first lens group includes a prism lens, the first lens group, the second lens group, and the fifth lens group are fixed groups, and the third lens group and the fourth lens group are moving groups.

Inventors

이상훈
문성민

Assignees

엘지이노텍 주식회사

Dates

Publication Date: 20260512
Application Date: 20241104

Claims (15)

It includes first to fifth lens groups arranged along the optical axis, and The above first lens group has a positive (+) refractive power, and The above second lens group has negative (-) refractive power, and The above third lens group has a positive (+) refractive power, and The above-mentioned fourth lens group has a negative (-) refractive power, and The above-mentioned fifth lens group has a positive (+) refractive power, and The above first lens group includes a prism lens, and The first lens group, the second lens group, and the fifth lens group are fixed groups, and The above third and fourth lens groups are optical systems that are moving groups.
In paragraph 1, The above first lens group includes a first lens and a second lens which is a prism lens, and The first lens above is an optical system having a meniscus shape with the object side being convex.
In paragraph 2, The first lens above is an optical system having positive (+) refractive power.
In paragraph 2, The above second lens group includes a third lens, a fourth lens, and a fifth lens, and The above third lens group includes a sixth lens and a seventh lens, and The above-mentioned fourth lens group includes the eighth lens and the ninth lens, and The above-mentioned fifth lens group is an optical system including the tenth lens.
In paragraph 4, The above third lens has a positive (+) refractive power, and The above-mentioned fourth lens has a negative (-) refractive power, and The above-mentioned fifth lens is an optical system having negative (-) refractive power.
In paragraph 4, The above-mentioned sixth lens has a positive (+) refractive power, and The above seventh lens has a negative (-) refractive power, and The above eighth lens is an optical system having positive (+) refractive power.
In paragraph 4, The above ninth lens has a negative (-) refractive power, and The above 10th lens is an optical system having positive (+) refractive power.
In paragraph 1, At the wide angle end, the distance between the second lens group and the third lens group on the optical axis is greater than the distance between the fourth lens group and the fifth lens group, and An optical system in which the distance between the second lens group and the third lens group at the optical axis at the telescopic end is smaller than the distance between the fourth lens group and the fifth lens group.
In paragraph 1, An optical system satisfying the following condition. <Condition> 0.5 < TD_LG2 / TD_LG3 < 1 (In the above conditional equation, TD_LG2 is the length of the second lens group in the optical axis direction, and TD_LG3 is the length of the third lens group in the optical axis direction.)
In paragraph 1, An optical system satisfying the following condition. <Condition> 5 < TTL / ImgH < 8 (In the above conditional equation, TTL is the optical axis distance from the vertex of the object side of the first lens to the top plane of the image sensor, and ImgH is the maximum diagonal length of the image sensor.)
It includes first to ten lenses arranged along the optical axis, and The above second lens is a prism lens, and The first lens above has a positive (+) refractive power, and The above third lens has a positive (+) refractive power, and The above-mentioned fourth lens has a negative (-) refractive power, and The above fifth lens has a negative (-) refractive power, and The above-mentioned sixth lens has a positive (+) refractive power, and The above seventh lens has a negative (-) refractive power, and The above eighth lens has a positive (+) refractive power, and The above ninth lens has a negative (-) refractive power, and The above 10th lens is an optical system having positive (+) refractive power.
In Paragraph 11, The first and second lenses above are a first lens group having positive (+) refractive power, and The above third to fifth lenses are a second lens group having negative (-) refractive power, and The above 6th and 7th lenses are a third lens group having positive (+) refractive power, and The above 8th and 9th lenses are a 4th lens group having negative (-) refractive power, and The above 10th lens is an optical system that is a 5th lens group having positive (+) refractive power.
In Paragraph 12, The first lens group, the second lens group, and the fifth lens group are fixed groups, and The above third and fourth lens groups are optical systems that are moving groups.
In Paragraph 12, At the wide angle end, the distance between the second lens group and the third lens group on the optical axis is greater than the distance between the fourth lens group and the fifth lens group, and An optical system in which the distance between the second lens group and the third lens group at the optical axis at the telescopic end is smaller than the distance between the fourth lens group and the fifth lens group.
In Paragraph 11, An optical system satisfying the following condition. <Condition> 0.5 < |L1R1| / |L1R2| < 1.1 (In the above conditional equation, L1R1 is the radius of curvature of the object side of the first lens, and L1R2 is the radius of curvature of the sensor side of the first lens.)

Description

Optical System and Camera Module The present invention relates to an optical system for enhanced optical performance and a camera module including the same. Camera modules perform the function of capturing objects and saving them as images or videos, and are installed in various applications. In particular, camera modules are manufactured in ultra-compact sizes and are applied not only to portable devices such as smartphones, tablet PCs, and laptops, but also to drones and vehicles, providing a wide range of functions. For example, the optical system of a camera module may include an imaging lens that forms an image and an image sensor that converts the formed image into an electrical signal. In this case, the camera module can perform an autofocus (AF) function that aligns the focal length of the lens by automatically adjusting the distance between the image sensor and the imaging lens, and can perform a zooming function of zooming up or zooming out by increasing or decreasing the magnification of a distant object through a zoom lens. Additionally, the camera module employs image stabilization (IS) technology to correct or prevent image shaking caused by camera movement resulting from unstable fixed devices or user movements. The most important element for such camera modules to obtain an image is the imaging lens that forms the image. Recently, there has been growing interest in high performance, such as high image quality and high resolution, and research is being conducted on optical systems containing multiple lenses to achieve this. For example, research is being conducted using multiple imaging lenses with positive (+) or negative (-) refractive power to implement a high-performance optical system. An optical system containing multiple lenses may have a set Effective Focal Length (EFL). In this case, when the value of the Effective Focal Length (EFL) is relatively large, the lens adjacent to the object side has a large aperture or the largest aperture among the multiple lenses. Consequently, since the lens closest to the object side has a relatively large size, there is a problem in that it is difficult to miniaturize the optical system. An optical system containing multiple lenses may have a relatively large height. For example, as the number of lenses increases, the distance from the image sensor to the object surface of the lens adjacent to the object may increase. Accordingly, the overall thickness of a device such as a mobile device like a smartphone in which the optical system is placed may increase, and there is a problem that it is difficult to miniaturize. Camera modules for close-range imaging have a shorter TTL compared to conventional camera modules. As another example, camera modules for long-range imaging have a longer TTL compared to conventional camera modules. However, since portable terminals have limited installation space for camera modules, it is difficult to mount camera modules for long-range imaging or camera modules capable of adjusting image magnification (zoom camera modules). Therefore, a new optical system capable of solving the aforementioned problems is required. FIG. 1 is a diagram showing the configuration of an optical system according to the present embodiment operating in a first mode. FIG. 2 is a configuration diagram of an optical system according to the present embodiment operating in a second mode. FIG. 3 is a configuration diagram of an optical system according to the present embodiment operating in a third mode. Figure 4 is a table showing the aspherical coefficients of lenses in an optical system according to the present embodiment. FIG. 5 is a drawing for explaining the D-cut lens of the present invention. FIG. 6 is an example of a portable terminal having an optical system according to the present embodiment. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the technical concept of the present invention is not limited to some of the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted. In addition, terms used in this embodiment (including technical and scientific terms) may be interpreted in a sense that is generally understood by those skilled in the art to which this embodiment belongs, unless explicitly and specifically defined otherwise. Terms that are commonly used, such as terms defined in advance, may be interpreted in consideration of their meaning in the context of the relevant technology. Furthermore, the terms used in this embodiment are for the purpose of describing the embodiment and are not intended to limit the invention. In this specification, the singular form may include the plural form unless specifically stated otherwise in the text, and when described as "at least