Patent Application
20200319424
The subject matter herein generally relates to optical lenses, and more particularly to an optical lens having an improved imaging effect.
At present, manufacture of optical lenses requires ultra-precision processing to process a portion of an original textured surface into a glossy surface. However, a curvature of a lathing tool easily leads to excessive processing at an interface between the glossy surface and the textured surface, and thereby produces a glossy surface at the interface. Thus, light is reflected on the glossy surface of the interface, which forms stray light and affects an imaging quality of the optical lens.
Implementations of the present disclosure will now be described, by way of embodiments, with reference to the attached figures.
It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. Additionally, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features. The description is not to be considered as limiting the scope of the embodiments described herein.
Several definitions that apply throughout this disclosure will now be presented.
The term “coupled” is defined as connected, whether directly or indirectly through intervening components, and is not necessarily limited to physical connections. The connection can be such that the objects are permanently connected or releasably connected. The term “substantially” is defined to be essentially conforming to the particular dimension, shape, or other word that “substantially” modifies, such that the component need not be exact. For example, “substantially cylindrical” means that the object resembles a cylinder, but can have one or more deviations from a true cylinder. The term “comprising” means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in a so-described combination, group, series and the like.
Referring to
The lens group 20 is received in the lens barrel 10 along an axial direction of the lens barrel 10. In one embodiment, the lens group 20 includes a first lens 21, a second lens 22, and a third lens 23 stacked in sequence from the image side to an object side. The first lens 21 is housed in the second barrel portion 12. The second lens 22 is partially housed in the second barrel portion 12, partially housed in the third barrel portion 13, and partially housed in the fourth barrel portion 14. The third lens 23 is partially housed in the fourth barrel portion 14 and partially housed in the fifth barrel portion 15.
The first lens 21, the second lens 22, and the third lens 23 may be optical resins having high light transmittance. A light transmittance of the first lens 21, the second lens 22, and the third lens 23 is determined by specific materials of the first lens 21, the second lens 22, and the third lens 23.
As shown in
In one embodiment, the optical lens 100 further includes a spacer group 40. The spacer group 40 is housed in the lens barrel 10. The spacer group 40 includes a first spacer 41 and a second spacer 42. The first spacer 41 is located between the first lens 21 and the second lens 22 and is housed in the second barrel portion 12. The second spacer 42 is located between the second lens 22 and the third lens 23 and is housed in the fourth barrel portion 14.
Specifically, the first lens 21, the second lens 22, and the third lens 23 each include an optical portion (not labelled) and a skirt structure (not labelled) surrounding the optical portion and protruding from the optical portion. The first spacer 41 is located between the optical portion of the first lens 21 and the optical portion of the second lens 22, and is surrounded and positioned by the skirt structure of the second lens 22. The second spacer 42 is located between the optical portion of the second lens 22 and the optical portion of the third lens 23, and is surrounded and positioned by the skirt structure of the third lens 23. Both the first spacer 41 and the second spacer 42 are substantially hollow rings. In one embodiment, the first spacer 41 and the second spacer 42 are both light shielding sheets for shielding stray light.
The filter 50 is housed in the first barrel portion 11 and located on a side of the first lens 21 away from the second lens 22. The filter 50 is configured to filter out a portion of light having a specific wavelength band from external light incident on the optical lens 100. The filter 50 may be made of plastic or glass having a specific dye added. The filter 50 may be circular, square, or other shapes. In one embodiment, the filter 50 is circular.
Referring to
Referring to
The optical lens 100 has the following beneficial effects: if the angle θ formed between the connection region 32 and the second surface 31 is less than 15 degrees, the connection region 32 can cover the curvature of the lathing tool to avoid excessive processing and forming a glossy surface on the connection region 32 during manufacture, so that the connection region 32 can still diffusely reflect the light through the optical microstructure provided thereon, thereby reducing formation of stray light. Furthermore, an optical quality of the optical lens 100 is improved.
The embodiments shown and described above are only examples. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, including in matters of shape, size and arrangement of the parts within the principles of the present disclosure up to, and including, the full extent established by the broad general meaning of the terms used in the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201910275110.1 | Apr 2019 | CN | national |
