Patent Application
20220043233
The subject matter herein generally relates to lens modules, and more particularly to a fixing ring for a lens module.
Generally, a fixing ring is used for fixing a lens module in a lens barrel. The fixing ring not only stabilizes the lens module, but also blocks out most stray light. However, due to insufficient machining accuracy or a material of the fixing ring, a tip portion of the fixing ring is not sharp enough, which causes a portion of light to be scattered, which negatively affects an imaging quality.
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 another 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.
The fixing ring 50 is fixed between a lens of the lens group 20 most adjacent to the filter 30 and the filter 30 to fix the lens group 20 in the lens barrel 10. An outer diameter of the fixing ring 50 matches a size of an inner wall of the lens barrel 10 to satisfy an air gap size requirement of an optical design.
Referring to
In one embodiment, the first end surface 51 faces the lens group 20, and the second end surface 52 faces the filter 30. In another embodiments, the first end surface 51 faces the filter 30, and the second end surface 52 faces the lens group 20.
In one embodiment, the connecting surface 543 is a curved surface protruding outward. Due to a limited accuracy of processing the protrusion 54, the connecting surface 543 is formed between the first inclined surface 541 and the second inclined surface 542.
In one embodiment, the first inclined surface 541 may be directly coupled to the first end surface 51, and the second inclined surface 542 may be directly coupled to the second end surface 52. In another embodiment, the first inclined surface 541 and the second inclined surface 542 may be respectively coupled to the first end surface 51 and the second end surface 52 through other surfaces.
In one embodiment, a material of the light absorbing layer 60 includes at least one of black polyethylene terephthalate or black liquid crystal polymer, and a thickness D of the light absorbing layer 60 is 1 μm-50 μm.
In one embodiment, a distance W between the first end surface 51 and the second end surface 52 is 0.25 mm-0.35 μm, and an included angle θ1 between the first inclined surface 541 and the second inclined surface 542 is 70°-180°. The distance W and the included angle θ1 satisfy the following relationship: 0.235≤W×sin(θ1)≤0.35.
By setting the distance W and the included angle θ1 to satisfy the above relationship, the first inclined surface 541 and the second inclined surface 542 can reflect the most stray light and improve an imaging quality. In one embodiment, the distance W is 0.33 mm, and the included angle θ1 is 75°.
In one embodiment, a diameter R of the through hole 53 decreases from the object side to the image side along the first inclined surface 541, and the diameter R of the through hole 53 increases from the object side to the image side along the second inclined surface 542. In one embodiment, the diameter R of the through hole 53 is 4.2 mm.
Referring to
For comparison in the related art, referring to
Referring again to
The first lens 210 may have a positive refractive effect. The first lens 210 includes a first surface protruded toward the object side and a second surface protruded toward the image side. The first surface and the second surface may both be spherical surfaces.
The second lens 220 may have a negative refractive effect. The second lens 220 includes a third surface recessed toward the image side and a fourth surface recessed toward the object side. The third surface and the fourth surface may both be spherical surfaces.
The third lens 230 may have a positive refractive effect. The third lens 230 includes a fifth surface recessed toward the image side and a sixth surface protruding toward the image side. The fifth surface and the sixth surface may both be spherical surfaces.
The fourth lens 240 may have a negative refractive effect. The fourth lens 240 includes a seventh surface and an eighth surface. Both the seventh surface and the eighth surface may be aspherical surfaces.
In one embodiment, the first end surface 51 is adjacent to the object side of the lens module 100, and the second end surface 52 is adjacent to the image side of the lens module 100.
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 |
|---|---|---|---|
| 202010779324.5 | Aug 2020 | CN | national |
