Optical lens

#This application claims the priority benefit of China application serial no. 202211249753.7, filed on Oct. 12, 2022. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

#The disclosure relates to an optical element, and in particular relates to an optical lens.

#In recent years, optical imaging lenses have continued to evolve. In addition to requiring optical imaging lenses to be light, thin, and short, it is also more and more important to expand the field of view of optical imaging lenses and improve imaging quality such as lens aberration and chromatic aberration. However, during the process of glue dispensing and curing, the lens barrel of an optical lens may deform due to the shrinkage of the glue, which causes the displacement and decentering of internal parts (such as lens elements), negatively affecting the optical quality.

#FIG. 1 is a schematic cross-sectional view of an optical lens according to the first embodiment of the disclosure.

#FIG. 2 is a schematic cross-sectional view of an optical lens according to the second embodiment of the disclosure.

#FIG. 3 is a schematic cross-sectional view of an optical lens according to the third embodiment of the disclosure.

#FIG. 1 is a schematic cross-sectional view of an optical lens according to the first embodiment of the disclosure. Please refer to FIG. 1. In this embodiment, an optical lens 100 may be applied to a camera lens, a mobile phone lens, a telescopic lens, a head-mounted display, etc., but the disclosure is not limited thereto. The optical lens 100 includes a lens barrel 110, a first lens element 120, a lens element group 130 and an optical element 140. The lens barrel 110 has a first opening O1 and a second opening O2 opposite to each other, and the first opening O1 is smaller than the second opening O2. The first lens element 120, the lens element group 130, and the optical element 140 are sequentially arranged from the first opening O1 to the second opening O2. The lens barrel 110 is used to install the first lens element 120, the lens element group 130, the optical element 140, and other objects. In other words, the lens barrel 110 may be equipped with other optical lenses, and the disclosure is not limited thereto.

#The first lens element 120 abuts against the lens barrel 110, and the lens element group 130 is fitted with the first lens element 120. A thickness of any lens element in the lens element group 130 on an optical axis I is less than or equal to the thickness of the first lens element 120 on the optical axis I. In addition, an optical effective diameter of any lens element in the lens element group 130 is smaller than the optical effective diameter of the first lens element 120. For example, in this embodiment, the lens element group 130 includes a second lens element 132. The optical lens 100 satisfies the following formula: ODLB/TLB≤7.500; ODLB is a maximum outer diameter D7 of the lens element group 130; and TLB is a thickness of the lens element with a maximum outer diameter in the lens element group 130 on the optical axis I. In this way, the difficulty in lens element processing may be effectively reduced, and a mold releasing problem during demolding may be alleviated, which is beneficial to the stability of molding and reducing the risk of cracks in the lens element after heating. In this embodiment, the lens element group 130 may include only one lens element, but the disclosure is not limited thereto.

#The optical element 140 includes a fixing portion 142 and a bearing portion 144 which are connected to each other. The fixing portion 142 abuts against the lens barrel 110, and the bearing portion 144 abuts against the lens element group 130. Specifically, the fixing portion 142 and the bearing portion 144 are integrally formed. The fixing portion 142 and the bearing portion 144 may be defined by a dividing line L parallel to a direction of the optical axis I, and the dividing line L is a boundary where the bearing portion 144 abuts against the lens element group 130. In other words, the fixing portion 142 is not in direct contact with the lens element group 130. The fixing portion 142 has a protrusion 146 extending toward a direction of the first lens element 120. The protrusion 146 is positioned between the lens barrel 110 and the lens element group 130 in a radial direction. On the other hand, a minimum vertical distance D1 from the fixing portion 142 to the optical axis I is greater than a maximum vertical distance D2 from the bearing portion 144 to the optical axis I. In this embodiment, a minimum thickness of the fixing portion 142 of the optical element 140 in a direction perpendicular to the optical axis I is 0.100 mm, which ensures that there is no filling problem when the optical element 140 is formed. If the minimum thickness of the fixing portion 142 of the optical element 140 in the direction perpendicular to the optical axis I is less than 0.100 mm, filling problem may arise when the optical element 140 is formed, and also, difficulties such as component deformation may arise during demolding.