Optical lens and camera module comprising the same
By setting apodization regions at the edges of the straight and curved portions of the optical lens and coating them with ink to create different light transmittance, the flare and phantom problems of D-cut lenses are solved, and the optical performance is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- LG INNOTEK CO LTD
- Filing Date
- 2021-04-29
- Publication Date
- 2026-06-16
AI Technical Summary
Existing D-cut lenses are prone to flare and phantom phenomena when reflecting light.
Apodization regions are set at the edges of the straight and curved portions of the optical lens, and different light transmittances are formed by coating with ink to reduce diffraction effects.
It effectively reduces flare and ghosting phenomena at the edge of the optical lens, thus improving optical performance.
Smart Images
Figure CN115461655B_ABST
Abstract
Description
Technical Field
[0001] This embodiment relates to an optical lens and a camera module including the optical lens. Background Technology
[0002] Miniature cameras have recently been widely used in portable devices, and they include the ability to shoot video and digital images.
[0003] The camera module includes an image sensor, a lens barrel for housing a camera lens facing the image sensor, a voice coil motor (VCM) for narrowing or widening the gap between the camera lens and the image sensor, and an aperture.
[0004] Typically, a camera lens consists of three or four optical lenses arranged in an overlapping manner.
[0005] At least one of the optical lenses may be a D-cut lens having a straight portion cut off on one side.
[0006] Figure 1 It is a cross-sectional view of a D-cut lens according to existing technology, and Figure 2 It indicates passage. Figure 1 A view of the image measured by the D-cut lens.
[0007] refer to Figure 1 and Figure 2 According to the prior art, the D-cut lens 10 can have a straight portion 12, which has a shape in which one side is cut off. For example, the D-cut lens 10 may include a plurality of curved portions 14 facing each other and a plurality of straight portions 12 opposite to each other. The straight portion 12 can be formed by partially cutting off a circular lens.
[0008] In camera modules where prisms or mirrors are used, the aforementioned D-cut lens can be applied to at least one of a plurality of optical lenses to reduce the module height or Fno.
[0009] However, as in Figure 2 As illustrated, due to the shape of the D-cut lens itself, when light is reflected through the D-cut lens, there is a problem of flare or phantom. Summary of the Invention
[0010] Technical topics
[0011] This embodiment provides an optical lens that can reduce the occurrence of flares or phantoms by improving its structure, and a camera module including the optical lens.
[0012] Technical solution
[0013] As an example, in an optical lens that includes at least one straight portion and one curved portion on its outer surface, an apodization region for reducing flare is provided in the edge adjacent to the straight portion of the optical lens.
[0014] The apodization region can include multiple regions with different light transmittance.
[0015] Apodization regions can be formed to have lower light transmittance as they move toward the edge.
[0016] A freaked area is an area on its surface coated with ink, and the coated area can become thicker as it moves toward the edge.
[0017] An apodization region is an area in which multiple patterns are set apart from each other, and the cross-sectional shape of the patterns can be any of a circular shape, an elliptical shape, and a polygonal shape.
[0018] The pattern can be formed to have a larger size as it moves toward the edge.
[0019] The gaps between adjacent patterns can become closer as they move toward the edge of the optical lens.
[0020] The straight portions are configured in multiple ways and are positioned to face each other relative to the center, and the curved portions are configured in multiple ways and can also be positioned to face each other relative to the center.
[0021] Assuming the linear distance between multiple straight sections is A and the thickness of the apodization region defined in the direction perpendicular to the straight sections is C, then 0.05*A≤C≤0.5*A.
[0022] Assuming the linear distance between multiple straight sections is A, and the maximum linear distance between multiple curved sections is B, then A = α * B, (0.3 ≤ α ≤ 0.9).
[0023] Beneficial effects
[0024] The advantage of this embodiment is that it can reduce flare and phantom phenomena caused by the diffraction effect of the apodization region in the edge region of the optical lens. Attached Figure Description
[0025] Figure 1 It is a cross-sectional view of a D-cut lens according to existing technology.
[0026] Figure 2 It indicates passage. Figure 1 A view of the image measured by the D-cut lens.
[0027] Figure 3This is a cross-sectional view of an optical lens according to an embodiment of the present invention.
[0028] Figure 4 This is a view illustrating an image measured through an optical lens according to an embodiment of the present invention.
[0029] Figure 5 This is a schematic graph of the transmittance at each position of the optical lens according to an embodiment of the present invention.
[0030] Figure 6 This is an enlarged view of the apodization region in an optical lens according to an embodiment of the present invention.
[0031] Figure 7 This is a view illustrating a modified embodiment of the aberration region according to an embodiment of the present invention.
[0032] Figures 8 to 12 This is a graph used to explain the light transmittance of an arrangement of apodization regions in an optical lens according to an embodiment of the present invention. Detailed Implementation
[0033] Preferred embodiments of the invention will be described in detail below with reference to the accompanying drawings.
[0034] However, the technical concept of the present invention is not limited to the certain embodiments to be described, but can be implemented in various forms, and within the scope of the technical concept of the present invention, one or more of the constituent elements can be selectively combined or substituted among the embodiments.
[0035] Furthermore, the terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly defined and described, can be interpreted as having a meaning that can be generally understood by those skilled in the art, and commonly used terms (such as terms defined in dictionaries) can be interpreted taking into account their meaning in the relevant technical context.
[0036] Furthermore, the terminology used in this specification is for describing embodiments and not for limiting the invention. In this specification, singular forms may include plural forms unless specifically stated in the phrase, and when described as “at least one (or more than one) of A, B, and C,” this may include one or more of all combinations that can be combined with A, B, and C.
[0037] In addition, terms such as first, second, A, B, (a) and (b) may be used in the description of embodiments of the present invention.
[0038] These terms are intended only to distinguish the components from one another, and they do not restrict the nature, order, or sequence of the components.
[0039] Furthermore, when a component is described as being “connected,” “coupled,” or “interconnected” to another component, the component is not only directly connected, coupled, or interconnected to other components, but may also include situations where it is “connected,” “coupled,” or “interconnected” due to another component between other components.
[0040] Additionally, when described as being formed or arranged "above" or "below" each component, "above" or "below" means not only that the two components are in direct contact, but also that one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below," it can include not only an upward direction but also a downward direction based on a component.
[0041] Figure 3 This is a cross-sectional view of an optical lens according to an embodiment of the present invention; Figure 4 This is a view illustrating an image measured through an optical lens according to an embodiment of the present invention; Figure 5 It is a schematic transmittance graph for each position of the optical lens according to an embodiment of the present invention; and Figure 6 This is an enlarged view of the apodization region in an optical lens according to an embodiment of the present invention.
[0042] refer to Figures 3 to 5 According to an embodiment of the present invention, the optical lens 100 may be a D-cut lens. The optical lens 100 may include at least one curved portion 110 and at least one straight portion 120. The optical lens 100 may have a shape in which one side of a circular lens is cut off. The cut-off area may form the straight portion 120.
[0043] The end of the curved portion 110 can be formed in a curved shape. The end of the straight portion 120 can be formed in a straight shape. The curved portion 110 and the straight portion 120 can be provided in the edge region of the optical lens 110. A plurality of curved portions 110 can be provided facing each other. A plurality of straight portions 120 can be provided and provided facing each other. The curved portion 110 and the straight portion 120 can be provided adjacent to each other. The outer surface of the optical lens 110 can have a shape in which the curved portions 110 and the straight portions 120 are alternately provided.
[0044] The length of the straight portion 120 can be made longer than the length of the curved portion 110. Conversely, the length of the curved portion 110 can be made longer than the length of the straight portion 120.
[0045] The optical lens 110 may include an apodization region 140. The apodization region 140 may be formed on the surface of the optical lens 110. The apodization region 140 may be disposed on the incident surface or the exit surface of the optical lens 110. The apodization region 140 may be disposed at the edge of the optical lens 110.
[0046] The apodization region 140 may be disposed adjacent to the straight portion 120 in the edge region of the optical lens 110. The apodization region 140 may be disposed on the inner side of the straight portion 120. When multiple straight portions 120 are provided, multiple apodization regions 140 may be provided so that they face each other relative to the center of the optical lens 110.
[0047] In some cases, at least a portion of the apodization region 140 may be located inside the curved portion 110. That is, the central portion of the apodization region 140 may be located inside the straight portion 120, and both ends may be located inside the curved portion 110.
[0048] The apodization region 140 may have a predetermined thickness relative to the height of the optical lens 110. Here, the height of the optical lens 110 may be defined as its length in the vertical direction among the plurality of straight portions 120.
[0049] As in Figure 6 As illustrated, the apodization region 140 may include multiple regions with different light transmittances. The apodization region 140 may be configured to have lower light transmittance as it moves toward the edge of the optical lens 110.
[0050] The apodization region 140 is a process used to reduce higher-order diffraction patterns, and diffraction effects in the edge regions of the optical lens 110 can be reduced. The apodization region 140 can be processed as a coating on the surface of the optical lens 110. The apodization region 140 can be an area coated with ink on the surface of the optical lens 110. To form as shown in... Figure 6 The apodization region 140 shown can be coated with a thicker coating as it moves toward the edge of the optical lens 110. Additionally, the apodization region 140 can be coated with a relatively darker ink as it moves toward the edge of the optical lens 110.
[0051] Meanwhile, the apodization region 140 can be implemented by a separate mechanism attached to the surface of the optical lens 110. For example, the separate mechanism may include a spacer.
[0052] Based on the above structure, as in Figure 4 As illustrated, it can reduce flare phenomena caused by diffraction effects in the edge region of the optical lens 100.
[0053] Additionally, as in Figure 5 As illustrated, abrupt changes in light transmittance can be prevented in the edge region of the optical lens 100 (the region where the straight portion 120 is provided). In other words, because the size of the Airy disk of the optical lens 100 is reduced due to the apodization region 140, diffraction effects can also be reduced.
[0054] Figure 7 This is a view illustrating a modified embodiment of the aberration region according to an embodiment of the present invention.
[0055] refer to Figure 7 The apodization region 140 can be a region in which multiple patterns 180 are combined. The cross-sectional shape of the pattern 180 can include any of a circular shape, an elliptical shape, and a polygonal shape. The pattern 180 can be formed to have a larger size as it moves toward the edge of the optical lens 100. In addition, the gap between adjacent patterns 180 can be formed to become closer as it moves toward the edge of the optical lens 100.
[0056] Figures 8 to 12 This is a view used to explain the light transmittance of the arrangement structure of the apodization region inside the optical lens according to an embodiment of the present invention.
[0057] refer to Figure 8 The length of each region of the optical lens 100 can be defined as follows.
[0058] A: Linear distance between multiple straight sections 120 (size of the optical lens)
[0059] B: The maximum linear distance between multiple bends 110 (effective diameter of the optical lens)
[0060] C: Thickness of the apodization region 140 measured in a direction perpendicular to the vertical section 120.
[0061] refer to Figure 9 Assuming that the transmittance in the central region of the optical lens 100 excluding the apodization region 140 is 1, and assuming that the transmittance in the region other than the optical lens 100 is 0, as described above, it can be confirmed that the light transmittance is continuously reduced or increased in the apodization region 140.
[0062] Additionally, refer to the brightness ratio of optical lens 100 based on the size of C. Figure 10 The curve shows that when the thickness of the apodization region 140 satisfies the range 0.05*A≤C≤0.5*A, it can be confirmed that flare phenomena can be prevented and brightness within the desired range can be obtained. The simulation results of the optical lens 100 within the range C described above are shown in... Figure 11As shown in the diagram. That is, when the thickness of the apodization region 140 is increased beyond what is necessary, the light transmittance of the optical lens 100 becomes very low, so that the flare prevention range is the same as above when taking into account the light transmittance.
[0063] Furthermore, the linear distance A between the multiple straight portions 120 and the maximum linear distance B between the multiple curved portions 110 can satisfy the following relational expression.
[0064] A = α * B, (0.3 ≤ α ≤ 0.9)
[0065] Where α can be the cutting ratio of D. That is, when compared with a circular lens of diameter A as a conventional lens, if α is within the above range, then the optical lens 100 has a satisfactory brightness ratio compared with the circular lens (reference). Figure 12 Therefore, the linear distance A between multiple straight sections 120 and the maximum linear distance B between multiple curved sections 110 can have the above relationship.
[0066] In the foregoing description, all components constituting embodiments of the present invention are described as operating in combination or integrally; however, the present invention is not necessarily limited to these embodiments. In other words, within the scope of the present invention, all components may be selectively operated in combination with one or more. Furthermore, the terms "comprising," "including," or "having" described above mean that the corresponding component may be inherent unless specifically stated otherwise, and therefore should be understood not to exclude other components, but rather to further include other components. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art, unless otherwise defined. Commonly used terms, such as those defined in dictionaries, should be interpreted as consistent with the context of the relevant art and should not be interpreted in an ideal or overly formal sense unless expressly defined in the present invention.
[0067] The above description is merely illustrative of the technical concept of the present invention, and those skilled in the art can make various modifications and changes without departing from the essential characteristics of the invention. Therefore, the embodiments disclosed in this invention are not intended to limit the technical concept of the invention but rather to describe it, and the scope of the technical concept of the invention is not limited by these embodiments. The scope of protection of this invention should be interpreted by the following claims, and all technical concepts within the equivalent scope should be interpreted as being included within the scope of this invention.
Claims
1. An optical lens comprising at least one straight portion and at least one curved portion on its outer surface. wherein The apodization zone used to reduce flare is located at the edge adjacent to the straight portion. The straight portions are arranged in multiple units and face each other relative to the center of the optical lens. The aberration regions are configured as multiple units. Each of the multiple apodization regions is arranged on each of the multiple straight sections. The curved portions are provided in multiple configurations and are arranged to face each other relative to the center of the optical lens. Wherein, the two ends of each of the plurality of apodization regions arranged on each of the plurality of straight portions are respectively located inside the curved portion. The straight portion is longer than the curved portion. The height of the optical lens is defined as the vertical length between the plurality of straight portions. Specifically, when the linear distance between the plurality of straight portions is A and the maximum linear distance B between the plurality of curved portions is B... A = a B, (0.3 ≤ a ≤ 0.9), Wherein, B is the effective diameter of the optical lens, and Wherein, when the linear distance between the plurality of straight portions is A and the thickness of the apodization region defined in the direction perpendicular to the straight portions is C, 0.05 A ≤ C ≤ 0.5 A.
2. The optical lens according to claim 1, wherein The apodization region comprises multiple regions with different light transmittances.
3. The optical lens according to claim 2, wherein The apodization region is shaped to have lower light transmittance as it moves toward the edge.
4. The optical lens according to claim 1, wherein The apodization area is the area on its surface coated with ink, and The coated area becomes thicker as it moves toward the edge.
5. The optical lens according to claim 1, wherein The apodization region is an area in which multiple patterns are set apart from each other, and The cross-sectional shape of the pattern includes any one of a circular shape, an elliptical shape, and a polygonal shape.
6. The optical lens according to claim 5, in, The pattern is formed to have a larger size as it moves toward the edge.
7. The optical lens according to claim 5, in, The gaps between adjacent patterns become closer as they move toward the edge of the optical lens.
8. A camera module, comprising: Image sensor; An optical lens, the optical lens facing the image sensor and having at least one straight portion and a curved portion on its outer surface; as well as A lens barrel that houses the optical lens. The apodization region, designed to reduce flare phenomena, is located at the edge adjacent to the straight portion. The straight portions are arranged in multiple units and face each other relative to the center of the optical lens. The aberration regions are configured as multiple units. Each of the multiple apodization regions is arranged on each of the multiple straight sections. The curved portions are provided in multiple configurations and are arranged to face each other relative to the center of the optical lens. Wherein, the two ends of each of the plurality of apodization regions arranged on each of the plurality of straight portions are respectively located inside the curved portion. The straight portion is longer than the curved portion. The height of the optical lens is defined as the vertical length between the plurality of straight portions. Specifically, when the linear distance between the plurality of straight portions is A and the maximum linear distance B between the plurality of curved portions is B... A=a B, (0.3 ≤ α ≤ 0.9), Wherein, B is the effective diameter of the optical lens. Wherein, when the linear distance between the plurality of straight portions is A and the thickness of the apodization region defined in the direction perpendicular to the straight portions is C, 0.05 A ≤ C ≤ 0.5 A。