The subject matter herein generally relates to lens modules, and more particularly to an optical lens of a lens module.
Generally, a lens module sets a light shield between two adjacent lenses to eliminate or reduce stray light, thereby reducing glare. However, there is no light shield behind the lens closest to the image side, and a portion of stray light may reflect off a flange of the lens, which will cause glare.
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 “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.
As shown in
The first flange portion 202 includes a connecting portion 21 and a peripheral portion 22. The connecting portion 21 is coupled between the first transparent portion 201 and the peripheral portion 22. An object side of the first transparent portion 201 includes a first transparent surface 2011. The connecting portion 21 includes a connecting surface 211 coupled to the first transparent surface 2011. The connecting surface 211 is a textured surface to diffuse stray light incident on the connecting surface 211, thereby reducing glare.
A surface angle of the connecting surface 211 is defined as α, and α is greater than 10°.
As shown in
In one embodiment, the plurality of lenses include a first lens 20, a second lens 30, and a third lens 40 housed and fixed in the lens barrel 10. The first lens 20, the second lens 30, and the third lens 40 are sequentially housed and fixed in the lens barrel 10 from the image side to the object side, and the first lens 20 is the optical lens 20 as described above in
The lens barrel 10 defines a receiving cavity 11 and a light entrance 12. The light entrance 12 communicates with the receiving cavity 11. An inner diameter of the light entrance 12 is smaller than an inner diameter of the receiving cavity 11. The first lens 20, the second lens 30, and the third lens 40 are sequentially housed and fixed in the housing cavity 11 from the image side to the object side. The third lens 40 is adjacent to the light entrance 12.
The second lens 30 further includes a second transparent portion 301 and a second flange portion 302 arranged around the second transparent portion 301. The second transparent portion 301 faces the first transparent portion 201, and the second flange portion 302 faces the first flange portion 202. The second transparent portion 301 includes a second transparent surface 3011 facing the first transparent surface 2011.
In one embodiment, the lens module 100 further includes a first light shield 50 and a second light shield 60. The first light shield 50 is located between the first lens 20 and the second lens 30, and the second light shield 60 is located between the second lens 30 and the third lens 40.
The first light shield 50 includes a main body 51 and defines a hole 52 surrounded by the main body 51. The hole 52 faces the first transparent portion 201.
A width of the connecting surface 211 is greater than Wp, and Wp satisfies the following relationship: Wp=2×(hs×tanθ+Rs−RL3), wherein θ is a half-field angle, Rs is a radius of the hole 52 of the first light shield 50, RL3 is a radius of the first transparent portion 201, and hs is a distance between the first transparent surface 2011 and the second transparent surface 3011 along the optical axis OO′.
In other embodiments, the lens module 100 may further include more lenses and light shields, as long as the lens closest to the image side is the optical lens 20 as described above.
In other embodiments, the lens module 100 may not include the first light shield and the second light shield. In this case, all of the lenses are the same as the optical lens 20.
In one embodiment, the lens module 100 further includes a filter (not shown), a photosensitive element (not shown), and a circuit board (not shown).
Referring to
The optical lens 100 provided by the present disclosure is provided with the connecting surface 211. By designing the texture, width, and surface angle of the connecting surface 211, a portion of light incident on the connecting surface 211 can be bent outward or totally reflected, and then absorbed by the lens barrel 10. In this way, glare can be further reduced, and an imaging quality of the optical lens can be 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 |
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202010781439.8 | Aug 2020 | CN | national |