Plastic optical lens

Abstract

The present invention provides a plastic optical lens, which comprises an optical portion being passed by an optical axis and a mounting portion surrounding the optical portion. The mounting portion comprises a first surface facing a first side, a circular barrel mounting surface, a second surface facing a second side and connecting with the circular barrel mounting surface and a gate cutting surface connecting with the circular barrel mounting surface. The plastic optical lens may optionally comprise a protruding rim in the mounting portion or at least one multi-chamfering corner. Through controlling position and structure of the mounting portion or the multi-chamfering corner, it is beneficial to reduce demoulding resistance at different positions of the plastic optical lens to promote molding precision, so as to raise molding yield and mounting quality as well.

Description

Technical Field

[0001] This invention relates to a plastic optical lens, and more particularly to a plastic optical lens that can be applied to an optical imaging lens or an optical lens assembly. Prior Technology

[0002] The specifications of portable electronic devices are constantly evolving, and the specifications of their key components—optical imaging lenses or optical lens groups—must also be continuously improved to meet consumer demands and be applied in various fields. Optical lenses are indispensable basic components in optical imaging lenses or optical lens groups. The quality of the optical lens itself directly affects the optical quality of the optical imaging lens or optical lens group; therefore, how to manufacture stable and high-quality optical lenses is an area that requires continuous research and development.

[0003] To minimize size, most optical imaging lenses or lens assemblies in portable electronic devices are made of plastic using injection molding technology. The principle of injection molding is to utilize the thermoplasticity of plastic raw materials. The raw material is heated and melted into a molten fluid, which is then injected into a mold cavity under high pressure. After cooling, it is removed to obtain various special shapes for specific applications. Different parameters such as melt temperature, injection speed, holding pressure, and cooling time can generate excessive residual stress at different locations in the plastic optical lens during injection molding. This can cause stress release during demolding, leading to friction with the mold, creating demolding resistance, and resulting in problems such as appearance variations, poor flatness, and unstable dimensional accuracy.

[0004] Therefore, controlling the stress release during the demolding of plastic optical lenses has become a challenge and a problem that needs to be solved. Summary of the Invention

[0005] This invention provides a plastic optical lens applicable to an optical imaging lens or optical lens assembly. The optical imaging lens or optical lens assembly can capture images and record video, and is used in portable electronic products, such as mobile phones, cameras, tablet computers, and personal digital assistants (PDAs), but is not limited thereto. The plastic optical lens according to this invention includes an optical portion through which a central axis passes and an assembly portion surrounding the optical portion. The assembly portion includes a first surface facing a first side, an annular lens barrel assembly surface, a second surface facing a second side and connected to the annular lens barrel assembly surface, and a gate cutting surface connected to the annular lens barrel assembly surface. The plastic optical lens may optionally form a conical structure in the assembly portion and / or at least a gradient structure in the second surface. By controlling the position and structure of the conical structure and / or the gradient structure, the plastic optical lens can reduce the resistance generated at different positions of the plastic optical lens during demolding, improve molding accuracy, and thus improve molding yield, while also ensuring assembly quality.

[0006] In the disclosure of this invention, the parameters listed in the following table are used, but the invention is not limited to using only these parameters: parameter definition CTmax Maximum thickness of plastic optical lens on central axis Wa Maximum thickness of the assembly section parallel to the central axis Wc The maximum width of the conical structure parallel to the central axis Wcb The maximum width of the annular lens tube assembly surface parallel to the central axis Wcp The maximum width of the annular plane in a radial direction centered on the central axis Wgs The maximum width of the gradient structure parallel to the central axis Ra max Maximum radius of assembly section Rc max Maximum radius of the annular lens tube assembly surface Ro min Minimum radius of optical section Tplup Maximum distance from the annular plane to the first surface

[0007] According to an embodiment of the present invention, a plastic optical lens includes a conical structure located within a first radial range centered on a central axis and connected to a first surface and an annular lens barrel assembly surface. The first radial range includes at least a second radial range located between the gate cutting surfaces. The conical structure comprises an annular plane and a conical surface. The conical surface is connected to the annular plane and the annular lens barrel assembly surface. The annular plane is connected to the first surface. The junction of the conical surface and the annular plane forms the maximum radius of the lens, satisfying 2.600 ≤ Wcb / Wc ≤ 11.700. The first radial range forms at least one central angle with the central axis, the sum of which is θc, satisfying 0.055 ≤ θc / 360 degrees ≤ 0.920.

[0008] According to another embodiment of the present invention, a plastic optical lens is provided, wherein a conical structure is located within a first radial range centered on a central axis and connected to a first surface and an annular lens barrel assembly surface. The first radial range includes at least a second radial range located between the gate cutting surfaces. The conical structure comprises an annular plane and a conical surface. The conical surface is connected to the annular plane and the annular lens barrel assembly surface. The annular plane is connected to the first surface. The connection between the conical surface and the annular plane forms a maximum radius of the lens, satisfying 0.650 ≤ Wcb / Tplup ≤ 6.400. The first radial range forms at least one central angle with the central axis, the sum of which is θc, and satisfies 0.055 ≤ θc / 360 degrees ≤ 0.920.

[0009] According to another embodiment of the present invention, a plastic optical lens is provided, wherein the annular lens barrel assembly surface is connected to the first surface and parallel to the central axis, and the second surface includes at least one gradient structure, which is located near the gate cut surface and connected to the annular lens barrel assembly surface. The gradient structure includes a first surface farther from the annular lens barrel assembly surface and a second surface closer to the annular lens barrel assembly surface. The angles between the tangents of the first and second surfaces and the central axis are both within 10 to 45 degrees, and the angle between the tangent of the first surface and the central axis is greater than the angle between the tangent of the second surface and the central axis. The gradient structure and the central axis respectively form at least one central angle, the sum of which is θgs, and satisfies 0.055 ≤ θgs / 360 degrees ≤ 0.920 and 0.300 ≤ Wcb / Wgs ≤ 2.250. Simple Explanation of the Diagram

[0010] To better understand the embodiments described in this specification, please refer to the following figures: [Figure 1] A cross-sectional view of a plastic optical lens according to a first embodiment of the present invention; [Figure 2] A partially enlarged view of the plastic optical lens according to the first embodiment of the present invention; [Figure 3] A schematic diagram illustrating the lens surface of one of the plastic optical lenses according to the first embodiment of the present invention; [Figure 4] A schematic diagram illustrating the lens surface of one of the plastic optical lenses according to the second embodiment of the present invention; [Figure 5] A schematic diagram illustrating the lens surface of one of the plastic optical lenses according to the third embodiment of the present invention; [Figure 6] illustrates a cross-sectional view of a plastic optical lens according to a third embodiment of the present invention; [Figure 7] A schematic diagram illustrating the lens surface of one of the plastic optical lenses according to the fourth embodiment of the present invention; [Figure 8] A schematic diagram illustrating the lens surface of one of the plastic optical lenses according to the fifth embodiment of the present invention; [Figure 9] A schematic diagram illustrating the lens surface of one of the plastic optical lenses according to the sixth embodiment of the present invention; [Figure 10] illustrates a cross-sectional view of a plastic optical lens according to the seventh embodiment of the present invention; [Figure 11] A schematic diagram illustrating the lens surface of one of the plastic optical lenses according to the seventh embodiment of the present invention; [Figure 12] A cross-sectional view of the plastic optical lens according to the eighth embodiment of the present invention; [Figure 13] A schematic diagram illustrating the lens surface of one of the plastic optical lenses according to the eighth embodiment of the present invention; [Figure 14] illustrates a cross-sectional view of a plastic optical lens according to the ninth embodiment of the present invention; [Figure 15] A schematic diagram illustrating the lens surface of one of the plastic optical lenses according to the ninth embodiment of the present invention; [Figure 16] illustrates a cross-sectional view of a plastic optical lens according to the tenth embodiment of the present invention; [Figure 17] A schematic diagram illustrating the lens surface of one of the plastic optical lenses according to the tenth embodiment of the present invention; [Figure 18] illustrates a cross-sectional view of a plastic optical lens according to the eleventh embodiment of the present invention; [Figure 19] shows a schematic diagram of the lens surface of one of the plastic optical lenses according to the eleventh embodiment of the present invention. Implementation

[0011] The terms "optical section," "assembly section," "first side," and "second side" used in this specification and the claims should be interpreted based on the definitions listed in this specification.

[0012] Any plastic optical lens described in this specification can be used as an optical imaging lens or optical lens group in a portable electronic product. Portable electronic products include, but are not limited to, mobile phones, cameras, tablet computers, personal digital assistants (PDAs), etc. The optical imaging lens or optical lens group provides the function of capturing images and recording videos during operation. Its operation may include receiving incident imaging rays parallel to one optical axis to within a half-angle of view (HFOV) relative to the optical axis. The imaging rays are imaged on an imaging plane after passing through the optical lens group.

[0013] A plastic optical lens is generally a flat structure formed by two opposing lens surfaces and the outer contour of the lens edge between the two lens surfaces. Functionally, it is divided into an optical part through which an optical axis passes and an assembly part surrounding the optical part. The orientation of the two lens surfaces as a whole represents a first side and a second side, respectively, and can correspond to the direction of the imaging light entering and forming the image in an applicable optical imaging lens or optical lens group. Preferably, the first side is oriented towards the predetermined direction of the imaging light entering, referred to here as "object side A1", and the second side is oriented towards the predetermined direction of the imaging light forming, referred to here as "image side A2". At this time, the first side and the second side are two opposite directions.

[0014] The optical portion of a plastic optical lens is defined as the specific range through which imaging rays in a suitable optical imaging lens or optical lens group pass on the lens surface. Preferably, the optical portion is a cylinder or cone with a central axis and at least one radius defined. When the plastic optical lens is assembled into a suitable optical imaging lens or optical lens group, the central axis ideally corresponds to the optical axis of the optical imaging lens or optical lens group to ensure image quality. The assembly portion of a plastic optical lens is defined as all parts surrounding the optical portion, extending from the outer contour surface of the lens edge.

[0015] The assembly section includes a first surface facing a first side, an annular lens barrel assembly surface, a second surface facing a second side and connected to the annular lens barrel assembly surface, and a gate cutting surface connected to the annular lens barrel assembly surface. The annular lens barrel assembly surface corresponds to the portion where the outer contour surface of the lens edge abuts against the inner contour of a lens barrel when the plastic optical lens is assembled in a suitable optical imaging lens or optical lens group; it is typically an annular surface parallel to the central axis. Since the plastic optical lens here is manufactured using injection molding technology, the process involves injecting molten plastic material through a gate into the mold cavity, cooling and solidifying it, and then removing it from the mold through steps such as mold opening and ejection. The plastic optical lens is then cut to separate it from excess plastic material; therefore, the plastic optical lens includes the gate cutting surface formed by this cutting step. Due to the characteristics of the cutting step, the gate cutting surface is typically a plane. The plastic optical lens of the present invention can selectively form a conical structure on the assembly section and / or at least a gradient structure on the second surface. By controlling the position and structure of the conical structure and / or the gradient structure, it is beneficial to reduce the resistance generated at different positions of the plastic optical lens during demolding, improve molding accuracy, and thus increase molding yield while ensuring assembly quality. Preferably, even better results can be achieved when controlling the position and structure of the conical structure and / or the gradient structure relative to the gate cut-off surface. This is because different degrees of deformation occur on the gate side and the opposite side of the gate during the demolding process of the plastic optical lens.

[0016] According to an embodiment of the present invention, a plastic optical lens includes a conical structure located within a first radial range centered on a central axis and connected to a first surface and an annular lens barrel assembly surface. The first radial range includes at least a second radial range located between the gate cutting surfaces. The conical structure comprises an annular plane and a conical surface. The conical surface is connected to the annular plane and the annular lens barrel assembly surface. The annular plane is connected to the first surface. The junction of the conical surface and the annular plane forms the maximum radius of the lens, satisfying 2.600 ≤ Wcb / Wc ≤ 11.700. The first radial range forms at least one central angle with the central axis, the sum of which is θc, satisfying 0.055 ≤ θc / 360 degrees ≤ 0.920.

[0017] According to another embodiment of the present invention, a plastic optical lens is provided, wherein a conical structure is located within a first radial range centered on a central axis and connected to a first surface and an annular lens barrel assembly surface. The first radial range includes at least a second radial range located between the gate cutting surfaces. The conical structure comprises an annular plane and a conical surface. The conical surface is connected to the annular plane and the annular lens barrel assembly surface. The annular plane is connected to the first surface. The connection between the conical surface and the annular plane forms a maximum radius of the lens, satisfying 0.650 ≤ Wcb / Tplup ≤ 6.400. The first radial range forms at least one central angle with the central axis, the sum of which is θc, and satisfies 0.055 ≤ θc / 360 degrees ≤ 0.920.

[0018] According to another embodiment of the present invention, a plastic optical lens is provided, wherein the annular lens barrel assembly surface is connected to the first surface and parallel to the central axis, and the second surface includes at least one gradient structure, which is located near the gate cut surface and connected to the annular lens barrel assembly surface. The gradient structure includes a first surface farther from the annular lens barrel assembly surface and a second surface closer to the annular lens barrel assembly surface. The angles between the tangents of the first and second surfaces and the central axis are both within 10 to 45 degrees, and the angle between the tangent of the first surface and the central axis is greater than the angle between the tangent of the second surface and the central axis. The gradient structure and the central axis respectively form at least one central angle, the sum of which is θgs, and satisfies 0.055 ≤ θgs / 360 degrees ≤ 0.920 and 0.300 ≤ Wcb / Wgs ≤ 2.250.

[0019] However, the present invention is not limited to the foregoing embodiments. The numerical ranges including the maximum and minimum values ​​obtained from the combination ratios of optical parameters disclosed in the first to eleventh embodiments below can all be implemented accordingly.

[0020] Please refer to Figures 1 through 3. Figure 1 shows a cross-sectional view of the plastic optical lens according to the first embodiment of the present invention, Figure 2 shows a partially enlarged view of the plastic optical lens according to the first embodiment of the present invention, and Figure 3 shows a schematic diagram of the lens surface of the plastic optical lens according to the first embodiment of the present invention. The plastic optical lens 100 includes an optical part 120 through which a central axis I passes and an assembly part 110 surrounding the optical part 120. Figures 1 and 2 are cross-sectional views of the lens taken along the direction through which the central axis I passes. The optical boundary OB represents the junction of the optical part 120 and the assembly part 110 on the lens surface, which physically means the point where the outermost radial edge ray passing through the lens surface intersects the lens surface. Figure 3 shows the lens surface facing an object side A1 with the axial direction of the central axis I as the plane direction of the drawing, and the center point CP represents the ideal position where the central axis I passes through the lens surface. The assembly section 110 includes a first surface 111, a second surface 112, an annular lens barrel assembly surface 113, a gate cutting surface 114, and a conical structure 115. The first surface 111 and the second surface 112 are two lens surfaces of the plastic optical lens 100 that are opposite each other front and back. In this embodiment, the first surface 111 is, for example, a lens surface facing the object side A1, and the second surface 112 is, for example, a lens surface facing the image side A2. However, in other embodiments, other directions may be arranged to represent the first and second sides, for example, the first surface is a lens surface facing the image side A2, and the second surface is a lens surface facing the object side A1, and it is not limited to this.

[0021] In this embodiment, the second surface 112 includes at least one gradient structure 118 connected to the annular lens barrel assembly surface 113. Here, a gradient structure 118 is used as an example. The gradient structure 118 is designed to address stress accumulation near the gate cut-off surface 114. Therefore, its preferred location is near the gate cut-off surface 114, and a more preferred location is at least near or including the gate cut-off surface 114. For example, the gradient structure 118 may be located alongside the gate cut-off surface 114 and at a distance W1 (shown in Figure 3) from it, and this distance W1 can be as small as possible, close to zero.

[0022] Each gradient structure 118 forms a central angle with the central axis I. The sum of the central angles formed by all gradient structures 118 is θgs. The sum of the central angles θgs is not limited, but preferably not greater than 180 degrees, such as 60 degrees, but not limited to this. In this embodiment, the sum of the central angles θgs is 309 degrees. The plastic optical lens 100 can meet the condition of 0.055≦θgs / 360 degrees≦0.920. At this time, the molding accuracy can be improved and the molding yield can be increased by reducing the local demolding resistance. The preferred range is 0.055≦θgs / 360 degrees≦0.500. In this way, gradient structures 118 can be set for areas of stress concentration and the number of assemblable parts can be increased, while improving the molding stability and assembly yield of the plastic optical lens 100.

[0023] In detail, as shown in Figure 2, the gradient structure 118 includes multiple surfaces, arranged in order of distance from the annular lens assembly surface 113 (first, second, third, and fourth surfaces 1181-1184). Among the first, second, third, and fourth surfaces 1181-1184, the closer to the annular lens assembly surface 113, the smaller the angle between the tangent of the surface and the central axis I (i.e., angles 1, 2, 3, and 4 shown in Figure 2). In other words, the farther away from the annular lens assembly surface 113, the larger the angle between the tangent of the surface and the central axis I. For example, compared to the second surface 1182, which is farther away from the annular lens assembly surface 113, the angle 1 between the tangent of the first surface 1181 and the central axis I is smaller than the angle 2 between the tangent of the second surface 1182 and the central axis I. Preferably, the angle between the tangent of each surface of the gradient structure 118 and the central axis I is within 10 to 50 degrees, thereby reducing the stress accumulated in the depth of the mold and around the gate cut surface 114 during demolding, improving molding accuracy, and thus improving molding yield.

[0024] The outer contour surface of the lens edge between the first surface 111 and the second surface 112 is subdivided into a gate cutting surface 114, an annular lens barrel assembly surface 113, and a conical structure 115. In this embodiment, the positions of the gate cutting surface 114 and the conical structure 115 are arranged exemplarily and are not limited thereto. For example, in this embodiment, the gate cutting surface 114 is located at the lower edge shown in Figures 1 and 2, and the conical structure 115 is connected between the first surface 111 and the annular lens barrel assembly surface 113 and extends within a first radial range D1 (shown in Figure 3) centered on the central axis I. The first radial range D1 includes a second radial range located opposite the gate cutting surface 114. Here, the first radial range D1 and the second radial range are both arc lengths of a 19-degree central angle centered on the central axis I, i.e., the first radial range D1 and the second radial range overlap. However, in other embodiments, the gate cut-off surface or the conical structure can also be arranged in other positions, such as: the conical structure can be closer to the second surface or can be connected between the second surface and the annular lens assembly surface; the first radial range can correspond to the arc length of other central angles centered on the central axis I, including the second radial range, etc. In addition, the position and size of the second radial range can also be changed, and are not limited to the arc length of the 19-degree central angle centered on the central axis I in the direction directly opposite the gate cut-off surface 114 in this embodiment. It can be adjusted to the arc length of any other central angle greater than 1 degree centered on the central axis I in the direction sideways to the gate cut-off surface 114. For example, the first radial range D1 of the conical structure 115 can be adjusted to correspond to the arc length of the 301-degree central angle centered on the central axis I in the direction opposite the gate cut-off surface 114.

[0025] The position of the conical structure 115 can be varied according to the design of the mold itself, for example, corresponding to the stress concentration point during demolding, thereby reducing the resistance generated at this point in the plastic optical lens 100 during demolding. For example, the conical structure 115 designed in this embodiment, which connects the first surface 111 and the annular lens barrel assembly surface 113 and extends within the first radial range D1, can help reduce the accumulated stress in the area of ​​stress concentration between the first surface 111 and the annular lens barrel assembly surface 113, i.e., in the direction opposite to the gate cut surface 114, when the plastic optical lens 100 is demolded during the manufacturing process, thereby improving the molding accuracy and thus improving the molding yield. The design of the first radial range D1 is as follows: The first radial range D1 is controlled by a central angle formed by the first radial range D1 and the central axis I. The sum of the central angles is θc. When the aforementioned advantages are met, the range is 0.055≦θc / 360 degrees≦0.920. The preferred range is 0.300≦θc / 360 degrees≦0.920. At this point, the lens processing difficulty can be further reduced, and the release problem caused during demolding can be alleviated, which is beneficial to the stability of the molding.

[0026] In detail, the conical structure 115 includes an annular plane 116 and a conical surface 117. The conical surface 117 is connected to the annular plane 116 and the annular lens barrel assembly surface 113. The annular plane 116 is connected to the first surface 111. At the junction of the conical surface 117 and the annular plane 116, i.e., point B in Figure 2, the maximum radius of the lens is formed. Relative to the axial direction centered on the central axis, the annular plane 116 is preferably a parallel plane, and the conical surface 117 preferably forms an inclined angle. Therefore, the conical surface 117 can reduce the resistance generated during demolding and improve the molding yield.

[0027] The plastic optical lens 100 of this embodiment can also satisfy at least one of the following conditions: Conditional expression (1): 2.600≦Wcb / Wc≦11.700; Conditional expression (2):0.650≦Wcb / Tplup≦6.400; Conditional expression (3): 1.300≦(Wc+Wcb) / Wcp≦11.000; Conditional expression (4): 0.250≦Wc / Wcp≦2.500; Conditional expression (5): 0.560≦Wcb / (Tplup+Wc)≦2.250; Conditional expression (6): 0.100≦Wc / (Ra max-Rc max)≦5.000; Conditional expression (7):7.200≦Wa / Wc≦28.000; Conditional expression (8): 2.100≦Wa / Wgs≦5.000; Conditional expression (9): 2.200≦Wa / Wcb≦6.700; Conditional expression (10): 1.170≦Ra max / Ro min≦5.000; and / or Conditional expression (11): 1.500≦Ra max / CTmax≦4.350, The parameters are defined as described in the table in this specification, and the length / width / thickness of the entity can also be seen in Figures 2 and 7.

[0028] When condition (1) is met, the ratio of the width of the annular lens barrel assembly surface 113 to the width of the conical structure 115 can be adjusted to avoid the ratio being too large and losing the effect of reducing demolding resistance, and to avoid the ratio being too small and causing the lens barrel assembly surface 113 to be too small and affecting the assembly of the plastic optical lens 100, thereby improving the molding and assembly yield.

[0029] When condition (2) is met, the ratio of the maximum width of the annular lens assembly surface 113 to the maximum distance from one end edge of the conical surface 117 defined by the annular plane 115 to the first surface 111 can be adjusted to avoid the ratio being too large and generating additional burrs, which would affect the assembly accuracy. At the same time, the ratio can also be adjusted to avoid the ratio being too small, which would cause the lens assembly surface 113 to be too small and affect the assembly of the plastic optical lens 100, thereby improving the assembly yield.

[0030] When condition (3) is met, by adjusting the ratio of the sum of the widths of the annular lens barrel assembly surface 113 and the conical structure 115 to the maximum radial width of the annular plane 116, it is beneficial to design the conical structure 115 for areas of stress concentration to reduce demolding resistance, avoid excessive demolding resistance caused by an excessively large ratio, and also avoid the conical structure 115 affecting the assembly of the plastic optical lens 100 due to an excessively small ratio.

[0031] When condition (4) is met, the ratio of the width of the conical structure 115 on the central axis I to the width on the radial direction with the central axis I as the axis can be adjusted to facilitate the design of appropriate dimensions of the conical structure 115, avoid the ratio being too large so that the conical structure 115 affects the assembly of the plastic optical lens 100, and also avoid the ratio being too small so as to increase demolding resistance, thereby improving molding accuracy.

[0032] When condition (5) is met, the ratio of the maximum distance from the end edge of the conical surface 117 defined by the annular lens barrel assembly surface 113 and the annular plane 115 to the first surface 111 and the thickness of the conical structure 115 can be adjusted. Based on the position of the end edge of the conical surface 117, the conical structure 115 can be configured for the stress concentration area to reduce the demolding resistance in that area, avoid the generation of additional burrs due to an excessively large ratio, and avoid affecting the assembly accuracy. At the same time, it is also to avoid the lens barrel assembly surface 113 being too small due to an excessively small ratio, which would affect the assembly of the plastic optical lens 100, thereby improving the assembly yield.

[0033] When condition (6) is met, by adjusting the ratio of the width of the conical structure 115 to the difference between the assembly part 110 and the annular lens barrel assembly surface 113, it is beneficial to design the conical structure 115 for different sized lenses to reduce demolding resistance, avoid the ratio being too large so that the conical structure 115 affects the assembly of the plastic optical lens 100, and also avoid the ratio being too small so that the demolding resistance is too large, thereby improving the molding accuracy.

[0034] When condition (7) is met, the ratio of the width of the conical structure 115 to the width of the assembly part 110 can be adjusted to avoid the ratio being too large and losing the effect of reducing demolding resistance, while also avoiding the ratio being too small and causing the conical structure 115 to affect the assembly, thereby improving molding accuracy and increasing assembly yield.

[0035] When condition (8) is met, by adjusting the ratio of the thickness of the assembly part 110 and the gradient structure 118, it is beneficial to design the gradient structure 118 for areas of stress concentration to reduce demolding resistance, avoid excessive demolding resistance caused by an excessively large ratio, and also avoid the gradient structure 118 affecting the assembly of the plastic optical lens 100 due to an excessively small ratio.

[0036] When condition (9) is met, by adjusting the ratio of the thickness of the assembly part 110 and the contact surface 113 of the annular lens barrel, it is beneficial to retain an appropriate contact surface 113 of the annular lens barrel for plastic optical lenses 100 of different thicknesses, so as to avoid the lens assembly being affected by an excessively large ratio, and also to avoid the effect of reducing demolding resistance being lost by an excessively small ratio, thereby improving the assembly and molding yield.

[0037] When condition (10) is met, by adjusting the ratio of the maximum radius of the assembly part 110 to the minimum radius of the optical part 120, it is beneficial to design the size of the assembly part 110 for plastic optical lenses 100 of different sizes, avoid the ratio being too large and affecting the imaging quality, and also avoid the ratio being too small and affecting the assembly accuracy, thereby improving the assembly yield.

[0038] When condition (11) is met, the ratio of the maximum radius of the assembly part 110 to the maximum thickness of the plastic optical lens 100 can be adjusted, which is beneficial for designing the plastic optical lens 100 for different products.

[0039] To more clearly illustrate the plastic optical lenses of each embodiment, the following description focuses only on the differences from the first embodiment, while omitting the description of the similarities. Please refer to Figure 4, which shows a schematic diagram of the lens surface of a plastic optical lens according to the second embodiment of the present invention. In this embodiment, the plastic optical lens 200 changes the extension range of the conical structure 115 to a third radial range D3 centered on the central axis I. The third radial range D3 includes the second radial range D2 located opposite the gate cut surface 114, and the third radial range D3 is exemplified by the arc length of a 120-degree central angle centered on the central axis I.

[0040] Please refer to Figures 5 and 6 together. Figure 5 shows a schematic diagram of the lens surface of a plastic optical lens according to the third embodiment of the present invention, and Figure 6 shows a cross-sectional view of the plastic optical lens according to the third embodiment of the present invention. In this embodiment, the plastic optical lens 300 modifies the extension range of the conical structure 115 to a fourth radial range D4 centered on the central axis I. The fourth radial range D4 includes a second radial range D2 located opposite the gate cut surface 114, and the fourth radial range D4 is all the arc lengths surrounding the outer contour of the lens outside the gate cut surface 114. In this design, the gate cut surface 114 occupies a central angle equivalent to 320 degrees centered on the central axis I. Therefore, the fourth radial range D4 is exemplified by the arc length of a 320-degree central angle centered on the central axis I, but is not limited thereto.

[0041] Please refer to Figure 7, which illustrates a schematic diagram of the lens surface of a plastic optical lens according to the fourth embodiment of the present invention. In this embodiment, the plastic optical lens 400 modulates the number of gradient structures 118 and the sum of their central angles θgs. Two gradient structures 118 are respectively located adjacent to both sides of the gate cut-off surface 114, such that the distance W1 between them and the gate cut-off surface 114 is close to zero. The central angle D6 formed by the two gradient structures 118, together with the gate cut-off surface 114, and the central axis I is approximately 60 degrees. In this design, the gate cut-off surface 114 occupies a central angle equivalent to 40 degrees; therefore, the sum of the central angles θgs formed by the two gradient structures 118 and the central axis I is a central angle of 20 degrees, but this is not a limitation.

[0042] Please refer to Figure 8, which illustrates a schematic diagram of the lens surface of a plastic optical lens according to the fifth embodiment of the present invention. In this embodiment, the plastic optical lens 500 modulates the number of gradient structures 118 and the sum of their central angles θgs. Two gradient structures 118 are respectively disposed near the gate cut surface 114, and a distance W1 exists between them and the gate cut surface 114. The central angle D7 formed by each gradient structure 118 and the central axis I is approximately 10 degrees; therefore, the sum of the central angles θgs formed by the two gradient structures 118 and the central axis I is a central angle of 20 degrees.

[0043] Please refer to Figure 9, which illustrates a schematic diagram of the lens surface of a plastic optical lens according to the sixth embodiment of the present invention. In this embodiment, the plastic optical lens 600 modulates the number of gradient structures 118 and the sum of their central angles θgs. Two gradient structures 118 are respectively disposed near the gate cut surface 114, and there is a distance W1 between them and the gate cut surface 114. The central angle D8 formed by each gradient structure 118 and the central axis I is approximately 60 degrees; therefore, the sum of the central angles θgs formed by the two gradient structures 118 and the central axis I is a central angle of 120 degrees.

[0044] Please refer to Figures 10 and 11 together. Figure 10 shows a cross-sectional view of the plastic optical lens of the seventh embodiment of the present invention, and Figure 11 shows a schematic diagram of the lens surface of the plastic optical lens of the seventh embodiment of the present invention. In this embodiment, the extension range of the conical structure 115 of the plastic optical lens 700 is taken as the arc length of a central angle of 302 degrees with the central axis I as the axis. The sum of the central angles θgs formed by the gradient structure 118 and the central axis I is a central angle of 306 degrees.

[0045] Please refer to Figures 12 and 13 together. Figure 12 shows a cross-sectional view of the plastic optical lens of the eighth embodiment of the present invention, and Figure 13 shows a schematic diagram of the lens surface of the plastic optical lens of the eighth embodiment of the present invention. The extension range of the conical structure 115 of the plastic optical lens 800 in this embodiment is taken as the arc length of a central angle of 331 degrees with the central axis I as the axis, and it does not have a gradient structure.

[0046] Please refer to Figures 14 and 15 together. Figure 14 shows a cross-sectional view of the plastic optical lens of the ninth embodiment of the present invention, and Figure 15 shows a schematic diagram of the lens surface of the plastic optical lens of the ninth embodiment of the present invention. In this embodiment, the extension range of the conical structure 115 of the plastic optical lens 900 is taken as the arc length of a central angle of 317 degrees with the central axis I as the axis, and the sum of the central angles θgs formed by the gradient structure 118 and the central axis I is a central angle of 315 degrees.

[0047] Please refer to Figures 16 and 17 together. Figure 16 shows a cross-sectional view of the plastic optical lens of the tenth embodiment of the present invention, and Figure 17 shows a schematic diagram of the lens surface of the plastic optical lens of the tenth embodiment of the present invention. The extension range of the conical structure 115 of the plastic optical lens 1000 in this embodiment is, for example, the arc length of a 20-degree central angle centered on the central axis I in the direction opposite to the gate cut surface 114. Two gradient structures 118 are respectively disposed near the gate cut surface 114. The central angle D6 formed by each gradient structure 118 and the central axis I is approximately 10 degrees. Therefore, the sum of the central angles θgs formed by the two gradient structures 118 and the central axis I is a 20-degree central angle.

[0048] Please refer to Figures 18 and 19 together. Figure 18 shows a cross-sectional view of the plastic optical lens of the eleventh embodiment of the present invention, and Figure 19 shows a schematic diagram of the lens surface of the plastic optical lens of the eleventh embodiment of the present invention. The gradient structure 115 of the plastic optical lens 1100 of this embodiment includes a central angle D6 of approximately 330 degrees formed with the central axis I near the gate cut surface 114, and does not have a conical structure.

[0049] In other embodiments, plastic optical lenses may be designed with only one of a gradient structure and a conical structure to reduce resistance during demolding.

[0050] In addition, any combination of parameters in the alternative embodiments can be selected to increase the constraints on the plastic optical lens, thereby facilitating the design of plastic optical lenses with the same architecture as the present invention.

[0051] The above description is based on several different embodiments of the present invention, wherein each feature may be implemented individually or in different combinations. Therefore, the disclosure of embodiments of the present invention is a specific example illustrating the principles of the present invention and should not limit the present invention to the disclosed embodiments. Furthermore, the foregoing description and accompanying drawings are merely illustrative of the present invention and are not intended to limit it. Variations or combinations of other elements are possible and do not depart from the spirit and scope of the present invention.

[0052] 1, 2, 3, 4: included angle

[0053] 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100: Plastic optical lenses

[0054] 110: Assembly Department

[0055] 111: First Page

[0056] 112: Second page

[0057] 113: Annular lens tube assembly surface

[0058] 114: Gate cut-off surface

[0059] 115: Conical structure

[0060] 116: Annular plane

[0061] 117: Conical surface

[0062] 118: Gradient Structure

[0063] 120: Optics Department

[0064] 1181: First Surface

[0065] 1182: Second Surface

[0066] 1183: Third Surface

[0067] 1184: Fourth Surface

[0068] A1: Object side

[0069] A2: Image side

[0070] CP: Center point

[0071] D1: First radial range

[0072] D2: Second radial range

[0073] D3: Third radial range

[0074] D4: Fourth radial range

[0075] D6, D7, D8: Central angles

[0076] I: Central axis

[0077] OB: Optical boundary

[0078] W1: Distance

Claims

1. A plastic optical lens, comprising: an optical portion passing through a central axis; and an assembly portion surrounding the optical portion, the assembly portion comprising: a first surface facing a first side; an annular lens barrel assembly surface; a second surface facing a second side and connected to the annular lens barrel assembly surface; a gate cut-off surface connected to the annular lens barrel assembly surface; and a conical structure located within a first radial range centered on the central axis and connected to the first surface and the annular lens barrel assembly surface, the first radial range including at least a second radial range located between the gate cut-off surface and the first surface, the conical structure comprising an annular plane and a conical surface, the conical surface being connected to the annular plane and the annular lens barrel assembly surface, the annular plane being connected to the first surface, and the junction of the conical surface and the annular plane forming a maximum radius of the lens, satisfying 2.600≦Wcb / Wc≦11.700, where Wc is the maximum width of the conical structure parallel to the central axis, Wcb is the maximum width of the annular lens tube assembly surface parallel to the central axis, the first radial range forms at least one central angle with the central axis, the sum of the central angles is θc, and satisfies 0.055≦θc / 360 degrees≦0.

920.

2. The plastic optical lens as described in claim 1 further satisfies 1.300≦(Wc+Wcb) / Wcp≦11.000, where Wcp is the maximum width of the annular plane in a radial direction centered on the central axis.

3. The plastic optical lens as described in claim 1 further satisfies 0.250≦Wc / Wcp≦2.500, where Wcp is the maximum width of the annular plane in a radial direction centered on the central axis.

4. A plastic optical lens, comprising: an optical portion through which a central axis passes; and an assembly portion surrounding the optical portion, the assembly portion comprising: a first surface facing a first side; an annular lens barrel assembly surface; and a second surface facing a second side and connected to the annular lens barrel assembly surface; A gate cut-off surface is connected to the annular lens barrel assembly surface; and a conical structure is located within a first radial range centered on the central axis and connected to the first surface and the annular lens barrel assembly surface. The first radial range includes at least a second radial range located between the gate cut-off surface and the annular lens barrel assembly surface. The conical structure includes an annular plane and a conical surface. The conical surface is connected to the annular plane and the annular lens barrel assembly surface. The annular plane is connected to the first surface. The junction of the conical surface and the annular plane forms a maximum radius of the lens, satisfying 0.650≦Wcb / Tplup≦6.400, where Wcb is the maximum width of the annular lens barrel assembly surface parallel to the central axis, and Tplup is the maximum distance from the annular plane to the first surface. The first radial range forms at least one central angle with the central axis, the sum of which is θc, and satisfies 0.055≦θc / 360 degrees≦0.

920.

5. The plastic optical lens as described in claim 4 further satisfies 0.560≦Wcb / (Tplup+Wc)≦2.250, where Wc is the maximum width of the conical structure parallel to the central axis.

6. The plastic optical lens as described in claim 4 further satisfies 0.100≦Wc / (Ra max-Rc max)≦5.000, where Ra max is the maximum radius of the assembly part and Rc max is the maximum radius of the annular lens barrel assembly surface.

7. The plastic optical lens as described in claim 4 further satisfies 7.200≦Wa / Wc≦28.000, where Wa is the maximum thickness of the assembly parallel to the central axis, and Wc is the maximum width of the conical structure parallel to the central axis.

8. The plastic optical lens as described in claim 1 or 4, wherein the second surface includes at least one gradient structure located near the gate cut surface and connected to the annular lens barrel assembly surface, the at least one gradient structure including at least a first surface closer to the annular lens barrel assembly surface and a second surface farther from the annular lens barrel assembly surface, the angle between the tangents of the first and second surfaces and the central axis being both within 10 to 50 degrees, and the angle between the tangent of the first surface and the central axis being smaller than the angle between the tangent of the second surface and the central axis.

9. The plastic optical lens as described in claim 8, wherein the at least one gradient structure includes at least the gate cut-off surface.

10. The plastic optical lens as claimed in claim 8, wherein the at least one gradient structure is disposed adjacent to the gate cut-off surface and at a distance from the gate cut-off surface, and the distance is at least close to zero.

11. The plastic optical lens as described in claim 8, wherein, The at least one gradient structure forms another central angle with the central axis, the sum of which is θgs, and satisfies 0.055≦θgs / 360 degrees≦0.

920.

12. The plastic optical lens as described in claim 11, wherein the sum of the other central angles θgs is not greater than 180 degrees.

13. A plastic optical lens, comprising: an optical portion through which a central axis passes; and an assembly portion surrounding the optical portion, the assembly portion comprising: a first surface facing a first side; an annular lens barrel assembly surface connected to the first surface and parallel to the central axis; a gate cutting surface connected to the annular lens barrel assembly surface; and a second surface facing a second side and connected to the annular lens barrel assembly surface, the second surface comprising at least one gradient structure, the at least one gradient structure being located near the gate cutting surface and connected to the annular lens barrel assembly surface, the at least one gradient structure comprising a first surface farther from the annular lens barrel assembly surface and a second surface closer to the annular lens barrel assembly surface, the angles between the tangents of the first and second surfaces and the central axis being both within 10 to 45 degrees, and the... The angle between the tangent of the first surface and the central axis is greater than the angle between the tangent of the second surface and the central axis. The at least one gradient structure forms at least one central angle with the central axis. The sum of the central angles is θgs, and satisfies 0.055≦θgs / 360 degrees≦0.920 and 0.300≦Wcb / Wgs≦2.250, where Wcb is the maximum width of the annular lens assembly surface parallel to the central axis, and Wgs is the maximum width of the at least one gradient structure parallel to the central axis.

14. The plastic optical lens as described in claim 13, wherein the at least one gradient structure includes at least the gate cut-off surface.

15. The plastic optical lens as claimed in claim 13, wherein the at least one gradient structure is disposed adjacent to the gate cut-off surface and at a distance from the gate cut-off surface, and the distance is at least close to zero.

16. The plastic optical lens as described in claim 13, wherein the sum of the central angles θgs is not greater than 180 degrees.

17. The plastic optical lens as described in claim 13 further satisfies 2.100≦Wa / Wgs≦5.000, where Wa is the maximum thickness of the assembly parallel to the central axis.

18. The plastic optical lens as described in any one of claims 1, 4, and 13 further satisfies 2.200≦Wa / Wcb≦6.700, where Wa is the maximum thickness of the assembly parallel to the central axis.

19. The plastic optical lens as described in any one of claims 1, 4, and 13 further satisfies 1.170≦Ra max / Ro min≦5.000, where Ra max is the maximum radius of the assembly and Ro min is the minimum radius of the optical part.

20. The plastic optical lens as described in any one of claims 1, 4, and 13 further satisfies 1.500 ≤ Ra max / CT max ≤ 4.350, where Ra max is the maximum radius of the assembly and CT max is the maximum thickness of the plastic optical lens on the central axis.

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