Metal light collecting component, and optical imaging lens module including the metal light collecting component

Abstract

The present invention provides a metal light-collecting component and an optical imaging lens module including the above-mentioned metal light-collecting component, wherein the metal light-collecting component includes a metal sheet and a light-shielding sheet with an opening, the light-shielding sheet is disposed on a surface of the metal sheet, wherein the area near the opening of the light-shielding sheet and the gap between the metal sheet and the light-shielding sheet is defined as a light-collecting space, the light-collecting space having the ability to attenuate stray light entering the light-collecting space through the opening.

Description

Technical Field

[0001] This invention relates to the field of optics, and more particularly to a metal light-collecting component and an optical imaging lens module comprising the aforementioned metal light-collecting component. This invention has the effect of reducing stray light and improving image quality. Prior Technology

[0002] The specifications of portable electronic products are constantly evolving, and their key components—optical imaging lenses—are also becoming more diversified, with applications extending beyond just shooting images and videos to include telephoto lenses. However, the magnification of a telephoto lens is directly proportional to its focal length, so the lens size increases with the magnification. To increase magnification while maintaining lens size, current high-magnification telephoto optical imaging lenses primarily use light-reflecting elements such as prisms to increase the light path within a limited space, achieving the goal of increasing focal length and magnification without significantly increasing lens size. However, using an optical imaging lens with a prism design to increase focal length can easily generate high-brightness stray light after multiple reflections by the light-reflecting elements, such as torch stray light, affecting image quality. Summary of the Invention

[0003] The present invention provides a metal light-collecting component, comprising a metal sheet and a light-shielding sheet having an opening, the light-shielding sheet being disposed on a surface of the metal sheet, wherein the area near the opening of the light-shielding sheet and the gap between the metal sheet and the light-shielding sheet is defined as a light-collecting space, the light-collecting space having the ability to attenuate stray light entering the light-collecting space through the opening.

[0004] The present invention also provides an optical lens imaging module, comprising a lens barrel, an optical imaging lens disposed in the lens barrel, a light reflecting element disposed in the lens barrel, the light reflecting element comprising a first reflecting surface, a second reflecting surface, a third reflecting surface and a fourth reflecting surface, and a metal light collecting component disposed on the outer surface of one of the first reflecting surface, the second reflecting surface, the third reflecting surface and the fourth reflecting surface, wherein the metal light collecting component comprises a metal sheet and a light shield with an opening, the light shield being disposed on a surface of the metal sheet, wherein the area near the opening of the light shield and the gap between the metal sheet and the light shield is defined as a light collecting space, the light collecting space having the ability to attenuate stray light entering the light collecting space through the opening.

[0005] In some embodiments of the invention, the surface of the metal sheet has a first black film.

[0006] In some embodiments of the present invention, the metal light-collecting component further includes a first pressure-sensitive adhesive disposed between the metal sheet and the light-shielding sheet, wherein A is defined as an area of ​​the light-shielding sheet, B is defined as an area of ​​the first pressure-sensitive adhesive, C is defined as an area of ​​the opening, and the condition A>B+C is satisfied.

[0007] In some embodiments of the invention, the condition A-(B+C)>4.40 mm2 is further satisfied.

[0008] In some embodiments of the present invention, the condition 3.20 ≤ DPSmin / Tpsa1 ≤ 12.00 is further satisfied, where DPSmin is the shortest distance from the opening to the first pressure-sensitive adhesive, and Tpsa1 is the thickness of the first pressure-sensitive adhesive.

[0009] In some embodiments of the present invention, the conditions of 0.15mm≦DPSmin≦0.40mm and 0.03mm≦Tpsa1≦0.05mm are further satisfied, where DPSmin is the shortest distance from the opening to the first pressure-sensitive adhesive and Tpsa1 is the thickness of the first pressure-sensitive adhesive.

[0010] In some embodiments of the present invention, the area of ​​the light-shielding sheet not adhered to the first pressure-sensitive adhesive is defined as D, and satisfies the condition D>C.

[0011] In some embodiments of the present invention, the metal sheet includes an etched region, and the area of ​​the etched region is defined as E, satisfying the condition E>B.

[0012] In some embodiments of the present invention, the condition 0.07mm≦Tmp+Tpsa1+Tsoma≦0.10mm is further satisfied, where Tmp is defined as the thickness of the area where the metal sheet contacts the first pressure-sensitive adhesive, Tpsa1 is the thickness of the first pressure-sensitive adhesive, and Tsoma is the thickness of the light-shielding sheet.

[0013] In some embodiments of the present invention, a second pressure-sensitive adhesive is further disposed on the metal sheet, satisfying the condition 0.93≦(Tm+Tpsa2) / (Tmp+Tpsa1+Tsoma)≦1.05, wherein Tpsa2 is a thickness of the second pressure-sensitive adhesive, Tm is a maximum thickness of the metal sheet, Tmp is a thickness of the area of ​​the metal sheet in contact with the first pressure-sensitive adhesive, Tpsa1 is a thickness of the first pressure-sensitive adhesive, and Tsoma is a thickness of the light-shielding sheet.

[0014] In some embodiments of the present invention, the second pressure-sensitive adhesive is designed in a U-shape and surrounds the light-shielding sheet.

[0015] In some embodiments of the present invention, the metal light-collecting component is disposed on the outer surface of the third reflective surface of the light-reflecting element.

[0016] In some embodiments of the present invention, the light-reflecting element has a light-transmitting region and a non-light-transmitting region. The surface of the light-transmitting region has a microstructured anti-reflective film, and the surface of the non-light-transmitting region has a second black film. The metal light-collecting component is attached to the non-light-transmitting region by the second pressure-sensitive adhesive, and the light-shielding sheet is disposed on the light-transmitting region.

[0017] In some embodiments of the present invention, X is defined as a thickness of the second black film, Y is defined as a thickness of the microstructure antireflective film, and the condition X>Y is satisfied.

[0018] The present invention is characterized by providing a metal light-collecting component that can be adhered to the surface of a prism and an optical imaging lens module comprising the metal light-collecting component, in order to solve the problem of stray light generated by light-reflecting elements (such as prisms) in optical imaging lens modules. Compared with embodiments without a metal light-collecting component or embodiments with only a light-shielding layer, the embodiments of the present invention can effectively reduce stray light and improve image quality. In addition, the metal light-collecting component of the present invention can be manufactured separately from the prism and has a more robust structure. Compared with embodiments that directly form an anti-reflection layer on the surface of the prism, it has advantages such as simple assembly, higher yield, and more stable structure. Simple Explanation of the Diagram

[0019] Figure 1 illustrates a three-dimensional structural diagram of an optical imaging lens module according to the present invention. Figure 2 shows a cross-sectional structural schematic diagram of an optical imaging lens module of the present invention. Figure 3 illustrates a three-dimensional structural diagram of an optical imaging lens module of the present invention viewed from a bottom surface. Figure 4 illustrates a simulated schematic diagram of imaging rays passing through the optical imaging lens and the light reflecting element. Figure 5 illustrates a simulated schematic diagram of imaging light passing through an optical imaging lens and a light reflecting element in another embodiment of the present invention. Figure 6 shows a front perspective view and a rear perspective view of the metal light-collecting component. Figure 7 shows a top view of a metal light-collecting component according to an embodiment of the present invention. Figure 8 shows a cross-sectional view obtained along section line A-A' of Figure 7. Figure 9 illustrates a top view of a metal light-collecting component according to another embodiment of the present invention. Figure 10 shows a cross-sectional view obtained along section line B-B' of Figure 9. Implementation

[0020] To enable those skilled in the art to further understand the present invention, preferred embodiments of the present invention are described below, and the composition and desired effects of the present invention are explained in detail with reference to the accompanying drawings.

[0021] For ease of explanation, the various drawings of this invention are merely illustrative to facilitate understanding of the invention, and their detailed proportions can be adjusted according to design requirements. The description of the vertical relationships between relative elements in the drawings should be understood by those skilled in the art to refer to the relative positions of objects; therefore, all can be flipped to present the same components, and this should all fall within the scope of this specification, as stated herein.

[0022] [First Embodiment]

[0023] Please refer to Figures 1, 2, 3, and 4. Figure 1 shows a three-dimensional structural schematic diagram of an optical imaging lens module of the present invention; Figure 2 shows a cross-sectional structural schematic diagram of an optical imaging lens module of the present invention; Figure 3 shows a three-dimensional structural schematic diagram of an optical imaging lens module of the present invention viewed from a bottom surface; and Figure 4 shows a simulated schematic diagram of imaging light passing through the optical imaging lens and the light reflecting element. The optical imaging lens module 1 of the present invention is, for example, a periscope lens module, comprising a lens barrel 2, an optical imaging lens 3 and a light reflecting element 5 located within the lens barrel 2, and a metal light-collecting component 4 attached to one of the outer surfaces of the light reflecting element 5. More specifically, the material of the lens barrel 2 may include plastic or metal, but is not limited to these. The function of the lens barrel 2 is to accommodate, support, fix and protect the optical imaging lens 3 and the light reflecting element 5. The optical imaging lens 3 and the light reflecting element 5 are set inside the lens barrel 2. The lens barrel 2 may also contain components such as retaining rings (not shown in the figure) to fix the optical imaging lens 3 and the light reflecting element 5 inside the lens barrel 2. For the sake of simplicity, the retaining rings and other components are not shown here.

[0024] As shown in Figure 2, the optical imaging lens 3 comprises multiple lenses arranged along the optical axis (Z direction in Figure 2). When light L emitted from an object to be photographed (not shown) enters the optical imaging lens 3, it sequentially passes through the multiple lenses of the optical imaging lens 3 and the light reflecting element 5, and then focuses on the imaging surface (not shown) to form a clear image. It is worth noting that the number of lenses, lens surface shape, and other parameters of the optical imaging lens 3 can be adjusted as needed. Specifically, although the optical imaging lens 3 in Figure 2 contains four lenses, in practice, the optical imaging lens 3 can contain more or fewer lenses, and the surface texture, optical parameters, and relative positions of each lens can be adjusted as needed. In other words, if the light L, after passing through the optical imaging lens 3 and undergoing several reflections by the light reflecting element 5, can be focused on the imaging surface to form a clear image, then the optical imaging lens 3 is applicable to this invention and falls within its scope.

[0025] The light-reflecting element 5 in this invention is, for example, a prism, a mirror, or other suitable reflective element. This embodiment uses a prism as an example for explanation. In the application of periscope lens modules, in order to meet the requirements of thinness and simultaneously increase the focal length and magnification of the periscope lens module, a light-reflecting element 5 is provided inside the lens barrel 2. When light L passes through the optical imaging lens 3, it will enter the light-reflecting element 5 and undergo multiple reflections, thus extending the travel path (light path) of light L. Since the magnification of the optical imaging lens is proportional to the focal length, by providing the light-reflecting element 5 to extend the travel path of light L, the focal length and magnification of the optical imaging lens module 1 can be increased without increasing the lens thickness too much.

[0026] However, while the addition of the light-reflecting element 5 improves the focal length and magnification of the optical imaging lens module 1 without significantly increasing lens thickness, the light ray L undergoes multiple reflections within the light-reflecting element 5. According to the applicant's experimental results, it was found that multiple reflections of the light ray L within the light-reflecting element 5 easily generate high-brightness stray light, affecting image quality, such as the problem of torch stray light. Specifically, torch stray light refers to diffusely reflected or scattered light rays generated after the light ray L is reflected by light-reflecting elements such as prisms 5. These rays do not propagate along the optical axis as expected but scatter in all directions, eventually entering the imaging surface and forming a blurry, unclear background light. Torch stray light has disadvantages such as reducing the contrast of the image, producing artifacts, and reducing the signal-to-noise ratio; therefore, methods must be found to reduce the problems caused by the aforementioned high-brightness stray light.

[0027] To address the aforementioned problem of high-brightness stray light, in the first embodiment of this invention, the optical imaging lens module 1 includes a metal light-collecting component 4, which is attached to one of the outer surfaces of the light-reflecting element 5. The metal light-collecting component 4 effectively reduces stray light and improves image quality. It is worth noting that in Figure 1, to more clearly show the relative position of the lens barrel 2 and the metal light-collecting component 4, the metal light-collecting component 4 is depicted at a distance below the lens barrel 2. However, in reality, the metal light-collecting component 4 should be attached to one of the outer surfaces of the light-reflecting element 5 as shown in Figure 2. The detailed structure of the metal light-collecting component 4 will be described further in subsequent paragraphs.

[0028] As shown in Figure 2, when light ray L passes through the optical imaging lens 3 and enters the light reflecting element 5, it is reflected sequentially by multiple reflecting surfaces of the light reflecting element 5. As shown in Figures 2 and 4, to clearly illustrate each reflecting surface of the light reflecting element 5, these surfaces are sequentially defined as a first reflecting surface S1, a second reflecting surface S2, a third reflecting surface S3, and a fourth reflecting surface S4. The order of these definitions corresponds to the order in which light ray L is reflected by each reflecting surface when it enters the light reflecting element 5. In other words, when light ray L enters the light reflecting element 5, it is reflected sequentially by the first reflecting surface S1, the second reflecting surface S2, the third reflecting surface S3, and the fourth reflecting surface S4. In this embodiment, from a cross-sectional view (Figure 2 or Figure 4), the second reflecting surface S2 may be parallel to the third reflecting surface S3, and the first reflecting surface S1 may be parallel to the fourth reflecting surface S4; however, the invention is not limited to this. The light reflecting element 5 shown in Figure 2 or Figure 4 has a parallelogram outline when viewed in cross-section. However, the specific shape of the light reflecting element 5 in this invention can be adjusted according to requirements. For example, in other embodiments of this invention, the light reflecting element 5 may include other shapes such as trapezoids, which are also within the scope of this invention.

[0029] Additionally, as shown in Figure 2 or Figure 4, light L penetrates from the second reflecting surface S2 into the light reflecting element (prism) 5, and after several reflections, it exits the light reflecting element 5 through the third reflecting surface S3. To allow light L to pass smoothly through the light reflecting element 5, a light-transmitting region 6 and a non-light-transmitting region 7 are provided on the second reflecting surface S2 and the third reflecting surface S3 of the light reflecting element 5 (see Figure 3 for reference). The main function of the light-transmitting region 6 is to allow light L to pass through the light reflecting element 5, while the non-light-transmitting region 7 prevents light L from being reflected outwards at an unexpected angle inside the light reflecting element 5. Therefore, a black thin film BF2 can be formed and covered on the surface of the non-light-transmitting region 7. The main function of the black thin film BF2 is to absorb excess light and reduce stray light. The material of the black thin film BF2 may include metal thin films, oxide thin films, carbon-based thin films, polymer thin films, etc., and this invention is not limited to these. In addition, apart from the second reflective surface S2 and the third reflective surface S3, the other reflective surfaces of the light-reflecting element 5 do not need to allow light to pass through, so they can be completely covered by the black thin film BF2. In other words, these reflective surfaces do not contain light-transmitting areas.

[0030] Figure 4 illustrates a simulated diagram showing multiple rays L parallel to the optical axis passing through the optical imaging lens 3 and the light reflecting element 5, ultimately converging on the imaging surface 9. As can be seen from Figure 4, the ray L enters the light reflecting element 5 after passing through the optical imaging lens 3, undergoes multiple reflections within the light reflecting element 5, and finally passes through the third reflecting surface S3 of the light reflecting element 5, focusing onto a single point on the imaging surface 9, forming a clear image on the imaging surface 9. In some embodiments, a filter 8 may be additionally provided between the imaging surface 9 and the light reflecting element 5. The filter 8, for example, is an infrared cut-off filter, used to prevent infrared rays in the imaging light from being transmitted to the imaging surface 9 and affecting the image quality. However, the present invention does not limit the formation of a filter 8; in other words, in some embodiments of the present invention, the filter 8 may be omitted.

[0031] In addition, Figure 4 also shows the position of the metal light-collecting component 4. As mentioned above, the metal light-collecting component 4 is attached to the third reflective surface S3 of the light-reflecting element 5, and has the function of absorbing stray light and improving image quality. To more clearly highlight the function of the metal light-collecting component 4, the applicant provides another embodiment, as shown in Figure 5. Figure 5 illustrates a schematic diagram of the imaging light passing through the optical imaging lens and the light-reflecting element in another embodiment of the present invention. The main difference between the embodiment in Figure 5 and the embodiment in Figure 4 is that the original metal light-collecting component 4 is replaced with a light-shielding plate 11A. That is, the optical imaging lens module in the embodiment of Figure 5 does not contain the metal light-collecting component 4, but contains a light-shielding plate 11A. Apart from this, the other parameters of the optical imaging lens module, including the parameters of the optical imaging lens 3 and the light-reflecting element 5, are the same as those in the embodiment shown in Figure 4. As shown in Figure 5, when a non-optically designed ray L passes through the optical imaging lens 3 and enters the light reflecting element 5, it may penetrate the surface of the light reflecting element 5 and enter the air gap between the light reflecting element 5 and the light shield 11A, simultaneously forming stray light. This stray light is then reflected by the surface of the light shield 11A and re-enters the interior of the light reflecting element 5, generating high-brightness stray light (as shown in the magnified areas R1 and R2 circled in Figure 5). In other words, the light is not reflected in the intended direction, and this unexpectedly generated stray light affects image quality. The light shield 11A, for example, is a black PI material sheet structure, and its light-gathering effect is not as good as the aforementioned metal light-gathering component 4. Therefore, a single-layer light shield 11A cannot effectively solve the stray light problem. Thus, as can be seen again from the simulation results in Figures 4 and 5, the metal light-gathering component 4 of the present invention does indeed have the function of reducing stray light and improving image quality compared to the embodiment using a single-layer light shield 11A. The structure of the metal light-collecting component 4 and the differences between the metal light-collecting component 4 and the light-shielding plate 11A will be described in more detail in the following paragraphs.

[0032] In other embodiments of the present invention, in order to solve the stray light problem generated in FIG5, a light-reflecting element containing a light-shielding structure may be directly manufactured by plastic injection molding to block stray light. That is, when forming the light-reflecting element (prism) 5, a light-shielding structure such as a rough surface is directly formed on the surface of the light-reflecting element 5, and the light-shielding structure is integrally formed with the light-reflecting element 5. Although the above method can improve the problem of high-brightness stray light, it also leads to other problems. That is, because the plastic injection-molded light-reflecting element 5 has low hardness, its appearance is easily damaged by bumps and knocks during coating, assembly and other processes. In addition, because the light-reflecting unit 5 containing the light-shielding structure has many grooves or sharp angles, it is also easy to cause appearance problems such as bubbles or shrinkage during the molding process, which affects the reflection of imaging light.

[0033] Therefore, in the first embodiment of the present invention, the light-shielding structure is not formed on the surface of the light-reflecting element in an integral molding manner, but the metal light-collecting component 4 is attached to the surface of the light-reflecting element 5. The manufacturing process of the metal light-collecting component 4 is simpler and it is not easy to produce assembly or shrinkage problems as described above. At the same time, it can also significantly improve the influence of stray light to improve the imaging quality.

[0034] The following paragraphs will focus on describing the structural features of the metal light-collecting assembly. It is understood that the metal light-collecting assembly described below can be attached to an outer surface of a light-reflecting element and applied in the optical lens imaging module containing the light-reflecting element described above. For simplicity, the features of the optical lens imaging module will not be repeated in the following paragraphs.

[0035] [Second Embodiment]

[0036] Please refer to Figures 6, 7, and 8. The left half of Figure 6 shows a front perspective view of the metal light-collecting component 4, and the right half shows a rear perspective view of the metal light-collecting component 4. Figure 7 shows a top view of a metal light-collecting component according to an embodiment of the present invention, and Figure 8 shows a cross-sectional view along section line A-A' in Figure 7. As shown in Figures 6, 7, and 8, the metal light-collecting component 4 includes a metal sheet 10, and a light-shielding sheet 11 on the front side of the metal sheet 10, wherein the light-shielding sheet 11 includes an opening OP. The metal sheet 10 is made of, for example, stainless steel, and its surface can be coated with a black thin film BF1 to increase light absorption and reduce reflection. The black thin film BF1 can be an oxide film, a carbon-based film, a polymer film, etc., and the present invention is not limited thereto. The material of the light-shielding sheet 11 is, for example, polyimide (PI), and the light-shielding sheet 11 is preferably black to enhance its light absorption effect, but the present invention is not limited thereto. It is worth noting that the material of the light-shielding sheet 11 here can be the same as that of the light-shielding sheet 11A in Figure 5 above. However, the light-shielding sheet 11A in Figure 5 is only a single-layer PI structure, while the light-shielding sheet 11 in this embodiment has an opening OP to allow light to pass through. The metal light-collecting component 4 includes a metal sheet 10 and a light-shielding sheet 11 with an opening. The light-collecting efficiency of the metal light-collecting component 4 is better than that of the single-layer light-shielding sheet 11A. The light-shielding sheet 11 is bonded to the metal sheet 10 by a first pressure-sensitive adhesive (PSA1). As can be seen from the top view (Figure 7) and the cross-sectional view (Figure 8), the space between the light-shielding sheet 11 and the metal sheet 10 is not completely filled with the first pressure-sensitive adhesive (PSA1). Instead, there is a space between the light-shielding sheet 11 and the metal sheet 10, but this space is not filled with the first pressure-sensitive adhesive (PSA1). From the top view, this space is located around the opening OP. This space is defined here as the light-collecting space 20. As can be seen more clearly from Figure 8, when light (stray light generated from the aforementioned prism) L enters the light-receiving space 20 through the opening OP, the light L may be reflected within the light-receiving space 20. However, since the lower metal plate 10 and the upper light-shielding plate 11 are preferably black or covered with a black thin film BF1, most of the light (stray light) L is absorbed or changes direction during the reflection process, thus greatly reducing stray light and avoiding excessive stray light from affecting the imaging quality.

[0037] As shown in Figures 6 to 8, the metal sheet 10 further includes a second pressure-sensitive adhesive PSA2. The main function of the second pressure-sensitive adhesive PSA2 is to attach the metal light-collecting component 4 to the aforementioned prism (light-reflecting element 5). In this embodiment, the second pressure-sensitive adhesive PSA2 can also be designed in a U-shape and surround the light-shielding sheet 11. More specifically, the second pressure-sensitive adhesive PSA2 can be located at the outer periphery of three sides of the light-shielding sheet 11 and does not overlap with the light-shielding sheet 11, so that the second pressure-sensitive adhesive PSA2 will not affect the coverage area of ​​the light-shielding sheet 11. In addition, as shown in Figure 8, the thickness of the second pressure-sensitive adhesive PSA2 is preferably greater than or equal to the sum of the thicknesses of the first pressure-sensitive adhesive PSA1 and the light-shielding sheet 11. That is, the top surface of the second pressure-sensitive adhesive PSA2 is preferably higher than or equal to the top surface of the light-shielding sheet 11. In this way, when the second pressure-sensitive adhesive PSA2 is attached to the prism, the outer surface of the prism will not touch the light-shielding sheet 11 and thus affect the structure of the light-shielding sheet 11.

[0038] Here, Tmp is defined as the thickness of the area where the metal sheet 10 contacts the first pressure-sensitive adhesive PSA1, which in this embodiment, Tmp is equal to the thickness of the metal sheet 10 in the Z-axis direction (as shown in Figure 8). Tm is a maximum thickness of the metal sheet 10 (in this embodiment, Tmp is equal to Tm). Tpsa1 is the thickness of the first pressure-sensitive adhesive PSA1 along the Z-axis direction, Tpsa2 is the thickness of the second pressure-sensitive adhesive PSA2 along the Z-axis direction, and Tsoma is the thickness of the light-shielding sheet 11 along the Z-axis direction. The following lists some parameters of the metal sheet 10 and the light-shielding sheet 11 in different embodiments of the present invention (referred to as Embodiment A, Embodiment B, and Embodiment C, respectively), as shown in Tables 1 and 2 below: Metal sheet 10 11 light-blocking sheet Tpas2 (μm) Material Tm (μm) Tpas1 (μm) Material Tsoma (μm) Example A 60 Stainless steel 40 40 PI 20 Example B 50 Stainless steel 40 40 PI 16 Example C 60 Stainless steel 40 40 PI 16 Table 1 Tm+Tpas2 Tmp+Tpas1+Tsoma (Tm+Tpas2) / (Tmp+Tpas1+Tsoma) Example A 100 100 1 Example B 90 96 0.9375 Example C 100 96 1.041666667 Table 2

[0039] [Third Embodiment]

[0040] Please refer to Figures 6, 9, and 10. Figure 9 shows a top view of a metal light-collecting assembly according to another embodiment of the present invention, and Figure 10 shows a cross-sectional view along section line B-B' of Figure 9. As shown in Figures 6, 9, and 10, the metal light-collecting assembly 4 also includes a metal sheet 10, with a light-shielding sheet 11 on the front side of the metal sheet 10, wherein the light-shielding sheet 11 includes an opening OP. The light-shielding sheet 11 is bonded to the metal sheet 10 by a first pressure-sensitive adhesive (PSA1). A second pressure-sensitive adhesive (PSA2) is located on the metal sheet 10 and designed in a U-shape around the light-shielding sheet 11. In addition, a light-collecting space 20 is also defined, wherein the light-collecting space 20 is located between the light-shielding sheet 11 and the metal sheet 10. The light-collecting space 20 is not filled with the first pressure-sensitive adhesive (PSA1), and as seen in Figure 9, the light-collecting space 20 is located around the opening OP. Most of the above features are the same as those in the second embodiment described above, so the similarities will not be repeated here.

[0041] The difference between this embodiment and the previous embodiment is that the metal sheet 10 includes a groove 18, which is formed by an etching step. The groove 18 has a depth D, and the first pressure-sensitive adhesive PSA1 is located within the groove 18. Because the groove 18 has a depth D, the top surface of the first pressure-sensitive adhesive PSA1 and the top surface of the light-shielding sheet 11 are also lowered. Therefore, the top surface of the first pressure-sensitive adhesive PSA1 and the top surface of the light-shielding sheet 11 in this embodiment will be lower than those in the second embodiment described above. Specifically, the reduction in height is equal to the depth D.

[0042] As can be seen more clearly from Figure 10, when light (stray light generated within the aforementioned prism) L enters the light-receiving space 20 through the opening OP, the light L is reflected within the light-receiving space 20. However, since both the lower metal sheet 10 and the upper light-shielding sheet 11 may be black or contain a black thin film BF1, most of the light (stray light) L is absorbed or its direction is changed during reflection, thus significantly reducing stray light and preventing excessive stray light from affecting image quality. Furthermore, as shown in Figure 10, the thickness of the second pressure-sensitive adhesive PSA2 is preferably greater than or equal to the sum of the thicknesses of the first pressure-sensitive adhesive PSA1 and the light-shielding sheet 11 minus the depth D of the groove 18. In other words, the top surface of the second pressure-sensitive adhesive PSA2 is preferably higher than or equal to the top surface of the light-shielding sheet 11. In this way, when the second pressure-sensitive adhesive PSA2 is attached to the prism, the outer surface of the prism will not touch the light-shielding sheet 11 and thus affect its structure. As described above, due to the presence of the groove 18, the top surface of both the first pressure-sensitive adhesive PSA1 and the top surface of the light-shielding sheet 11 are lowered, thus allowing the thickness of the second pressure-sensitive adhesive PSA2 to be designed to be lower. This also reduces the overall thickness of the metal light-collecting assembly 4. Apart from the features mentioned above, the remaining features of this embodiment are the same as those of the second embodiment described above, and will not be repeated here.

[0043] Here, Tmp is defined as the thickness of the area where the metal sheet 10 contacts the first pressure-sensitive adhesive PSA1. Since the first pressure-sensitive adhesive PSA1 is located within the groove 18 in this embodiment, Tmp is equal to the thickness of the metal sheet 10 at the first pressure-sensitive adhesive PSA1, or equal to the thickness of the unetched metal sheet 10 minus the depth D of the groove 18 (as shown in Figure 10). Tm is the maximum thickness of the metal sheet 10 (in this embodiment, Tmp = Tm - D). Tpsa1 is the thickness of the first pressure-sensitive adhesive PSA1 along the Z-axis direction, Tpsa2 is the thickness of the second pressure-sensitive adhesive PSA2 along the Z-axis direction, and Tsoma is the thickness of the light-shielding sheet 11 along the Z-axis direction. The following lists some parameters of the metal sheet 10 and the light-shielding sheet 11 in different embodiments of the present invention (referred to as Embodiment D, Embodiment E, and Embodiment F, respectively), as shown in Tables 3 and 4 below: Metal sheet 10 11 light-blocking sheet Tpas2 (μm) Material Tm (μm) Etching depth D (μm) Tpas1 (μm) Material Tsoma (μm) Example D 30 Stainless steel 40 26 40 PI 16 Example E 30 Stainless steel 40 16 30 PI 16 Example F 30 Stainless steel 50 36 50 PI 16 Table 3 Tm+Tpas2 Tmp+Tpas1+Tsoma (Tm+Tpas2) / (Tmp+Tpas1+Tsoma) Example D 70 70 1 Example E 70 70 1 Example F 80 80 1 Table 4

[0044] In the above embodiments, parameters such as the size and position of the components affect the performance of the metal light-collecting assembly 4. For example, as shown in Figure 7, the first pressure-sensitive adhesive PSA1 is designed in a U-shape, with a space around the opening OP serving as the range of the light-collecting space 20. Therefore, the area of ​​the light-collecting space 20 is related to the coverage area of ​​the first pressure-sensitive adhesive PSA1. In addition, the thickness Tpsa1 of the first pressure-sensitive adhesive PSA1 is also related to the height of the light-collecting space 20. Therefore, parameters such as the area of ​​the light-shielding sheet 11, the area of ​​the opening OP, and the distance between the opening OP and the first pressure-sensitive adhesive PSA1 will also affect the size of the light-collecting space, light-collecting efficiency, and structural stability of the metal light-collecting assembly 4. Therefore, the optimal proportional relationship between the parameters will be discussed in the following paragraphs. When the following conditions are met, corresponding advantages can also be brought about, as detailed below.

[0045] 1. This invention provides a metal light-collecting assembly 4, comprising a metal sheet 10 and a light-shielding sheet 11 with an opening OP. The light-shielding sheet 11 is disposed on a surface of the metal sheet 10, and the area near the opening OP of the light-shielding sheet 11 forms a light-collecting space 20 with the metal sheet 10, thereby attenuating stray light entering the light-collecting space through the opening OP. Utilizing the pressure-resistant and non-deformable properties of the metal sheet 10, combined with the pressure-resistant adhesive, a stable light-collecting space can be formed between the metal sheet 10 and the light-shielding sheet 11. Through the opening OP of the light-shielding sheet 11 of the metal light-collecting assembly 4, high-brightness stray light entering the light-collecting space 20 through the opening OP, such as torch stray light, can be attenuated, or the direction of high-brightness stray light entering the light-collecting space 20 through the opening OP can be changed by reflection within the light-collecting space 20, preventing the high-brightness stray light from reaching the image sensor and affecting image quality.

[0046] 2. The present invention further provides an optical lens imaging module 1 including the above-mentioned metal light-collecting component 4, comprising a lens barrel 2, an optical imaging lens 3 disposed in the lens barrel 2, a light reflecting element (e.g., a prism) 5 disposed in the lens barrel 2, the light reflecting element 5 including a first reflecting surface S1, a second reflecting surface S2, a third reflecting surface S3 and a fourth reflecting surface S4, and the above-mentioned metal light-collecting component 4 disposed on the outer surface of one of the first reflecting surface S1, the second reflecting surface S2, the third reflecting surface S3 and the fourth reflecting surface S4, wherein the metal light-collecting component 4 includes a metal sheet 10 and a light-shielding sheet 11 having an opening OP, the light-shielding sheet 11 being disposed on a surface of the metal sheet 10, and the area near the opening OP of the light-shielding sheet 11 forming a light-collecting space 20 with the metal sheet 10, thereby attenuating stray light entering the light-collecting space through the opening OP. In this invention, the metal light-collecting component 4 is attached to the third reflective surface S3 by a first pressure-sensitive adhesive PSA1. The metal light-collecting component 4 includes a metal sheet 10. The pressure-resistant and non-deformable properties of the metal sheet 10, combined with the pressure resistance of the pressure-sensitive adhesive, prevent air gaps between the metal light-collecting component 4 and the light-reflecting element 5, thus avoiding stray light reflection. The opening OP of the light-shielding plate 11 of the metal light-collecting component 4 allows non-imaging light entering the opening OP to be absorbed in the light-collecting space between the light-shielding plate 11 and the metal sheet 10, thereby avoiding or reducing the probability of torch stray light generated by non-imaging light due to the light-reflecting element.

[0047] 3. In some embodiments of the present invention, the surface of the metal sheet 10 has a first black film BF1, which is beneficial to increase the light absorption rate of the metal sheet 10 to attenuate stray light entering the light receiving space 20.

[0048] 4. In some embodiments of the present invention, the metal light-collecting component 4 includes a first pressure-sensitive adhesive PSA1 disposed between the metal sheet 10 and the light-shielding sheet 11, wherein A is defined as the area of ​​the light-shielding sheet 11, B is defined as the area of ​​the first pressure-sensitive adhesive PSA1, and C is defined as the area of ​​the opening OP, and the condition A>B+C is satisfied. Based on the above area relationship, it is advantageous to design the light-collecting space 20 to collect high-brightness stray light.

[0049] 5. In some embodiments of the present invention, the condition A-(B+C)>4.40 mm² is further satisfied. When the above condition is satisfied, it is advantageous to design a larger light-receiving space 20 to collect more high-brightness stray light.

[0050] 6. In some embodiments of the present invention, the condition 3.20 ≤ DPSmin / Tpsa1 ≤ 12.00 is further satisfied, where DPSmin is the shortest distance from the opening to the first pressure-sensitive adhesive (as shown in Figure 8), and Tpsa1 is the thickness of the first pressure-sensitive adhesive. When the above conditions are met, the shortest distance from the opening OP to the first pressure-sensitive adhesive PSA1 is long enough to allow sufficient reflection of high-brightness stray light from multiple angles, making it easier to reduce the brightness of the stray light or change its direction. Furthermore, the thickness of the first pressure-sensitive adhesive PSA1 is sufficient to provide enough space for the high-brightness stray light to be reflected.

[0051] 7. In some embodiments of the present invention, the conditions of 0.15mm ≤ DPSmin ≤ 0.40mm and 0.03mm ≤ Tpsa1 ≤ 0.05mm are further satisfied, where DPSmin is the shortest distance from the opening to the first pressure-sensitive adhesive, and Tpsa1 is the thickness of the first pressure-sensitive adhesive. As described above, this design helps to retain sufficient light-gathering space 20 to attenuate high-brightness stray light, and by limiting the upper limit of DPSmin, it avoids insufficient adhesion area of ​​the first pressure-sensitive adhesive PSA1.

[0052] 8. In some embodiments of the present invention, the area of ​​the light-shielding sheet 11 not adhered to the first pressure-sensitive adhesive PSA1 is defined as D, and satisfies the condition D>C. It is worth noting that the area D here is equal to the area A of the light-shielding sheet 11 minus the area B of the first pressure-sensitive adhesive PSA1. When the above condition is met, it is advantageous to design a sufficiently large light-receiving space 20 based on the area relationship between the light-shielding sheet 11 and the first pressure-sensitive adhesive PSA1.

[0053] 9. In some embodiments of the present invention, the metal sheet 10 includes an etched region (groove 18), and the area of ​​the etched region (groove 18) is defined as E, satisfying the condition E>B. When the above conditions are met, it is beneficial to reduce the thickness of the metal light-collecting component 4 for installation in the lens barrel 2, and it can also reduce the possibility of the second pressure-sensitive adhesive PSA2 falling off due to shear force.

[0054] 10. In some embodiments of the present invention, the condition 0.07 mm ≤ Tmp + Tpsa1 + Tsoma ≤ 0.10 mm is further satisfied. As described above, Tmp is defined as the thickness of the area where the metal sheet 10 contacts the first pressure-sensitive adhesive PSA1, Tpsa1 is the thickness of the first pressure-sensitive adhesive PSA1, and Tsoma is the thickness of the light-shielding sheet 11. It is worth noting that when the metal sheet 10 does not include the groove 18, Tmp is equal to the thickness of the metal sheet 10 in the Z direction, while when the metal sheet 10 includes the groove 18, Tmp is equal to the thickness of the metal sheet 10 in the Z direction minus the depth D of the groove 18. When the above conditions are satisfied, it is beneficial to assemble the optical imaging lens module to reduce interference within a limited space.

[0055] 11. In some embodiments of the present invention, a second pressure-sensitive adhesive (PSA2) is further disposed on the metal sheet 10, satisfying the condition 0.93 ≦ (Tm + Tpsa2) / (Tmp + Tpsa1 + Tsoma) ≦ 1.05, where Tpsa2 is the thickness of the second PSA, Tm is the maximum thickness of the metal sheet, Tmp is the thickness of the area of ​​the metal sheet 10 in contact with the first PSA1, Tpsa1 is the thickness of the first PSA1, and Tsoma is the thickness of the light-shielding sheet 11. When the above conditions are met, it is advantageous to use the pressure-resistant and non-deformable characteristics of the metal sheet 10 in combination with the pressure resistance of the PSA to design different etching depths of the grooves 18 and the thicknesses of each component, avoiding air gaps in the metal light-collecting assembly 4, and preventing non-imaging light from escaping from the metal light-collecting assembly to generate high-brightness stray light.

[0056] 12. In some embodiments of the present invention, the second pressure-sensitive adhesive PSA2 is designed to surround the light-shielding sheet 11 in a U-shape. As can be clearly seen in Figures 6, 7, and 9, the second pressure-sensitive adhesive PSA2 is designed to surround the three sides of the light-shielding sheet 11 in a U-shape. This design helps to increase the area of ​​the second pressure-sensitive adhesive PSA2, thereby enhancing the stability when the prism is adhered, preventing the metal sheet 10 from warping and causing changes in the gap, and also increasing the design freedom of the opening OP of the light-shielding sheet 11, so as to attenuate high-brightness stray light.

[0057] 13. In some embodiments of the present invention, the metal light-collecting component 4 is disposed on the outer surface of the third reflecting surface S3, which is beneficial for attenuating the high brightness stray light of the third reflecting surface S3.

[0058] 14. In some embodiments of the present invention, the light-reflecting element 5 has a light-transmitting region 6 and a non-light-transmitting region 7. The surface of the light-transmitting region 6 has a microstructured anti-reflective film layer ARF, and the surface of the non-light-transmitting region 7 has a second black film BF2. The metal light-collecting component 4 is adhered to the non-light-transmitting region 7 by means of a second pressure-sensitive adhesive PSA2, and the light-shielding sheet 11 is disposed on the light-transmitting region 6. When the above conditions are met, it is beneficial to solve the problem of high-brightness stray light of non-imaging light entering the light-transmitting region 6.

[0059] 15. In some embodiments of the present invention, X is defined as a thickness of the second black film, and Y is defined as a thickness of the microstructure antireflective film ARF, satisfying the condition X>Y. When the above conditions are met, it is beneficial for the metal light-collecting component 4 to adhere to the non-light-transmitting area 7 while the light-shielding sheet 11 does not come into contact with the microstructure antireflective film ARF, thus avoiding pressure loss caused by the microstructure antireflective film ARF. The thickness of X ranges from 7 to 12 µm, and the thickness of Y ranges from 250 to 350 nm.

[0060] In summary, the present invention is characterized by providing a metal light-collecting component that can be adhered to the surface of a prism, and an optical imaging lens module including the metal light-collecting component, in order to solve the problem of stray light easily generated by light-reflecting elements (such as prisms) in optical imaging lens modules. Compared with embodiments without a metal light-collecting component or embodiments with only a light-shielding layer, the embodiments of the present invention can effectively reduce stray light and improve image quality. In addition, the metal light-collecting component of the present invention can be manufactured separately from the prism and has a more robust structure. Compared with embodiments that directly form an anti-reflection layer on the surface of the prism, it has advantages such as simple assembly, higher yield, and more stable structure. The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made in accordance with the claims of the present invention shall be covered by the present invention.

[0061] 1: Optical Imaging Lens Module 2: Lens tube 3: Optical imaging lens 4: Metal light-collecting components 5: Light reflecting element 6: Light-transmitting area 7: Non-light-transmitting area 8: Filters 9: Imaging plane 10: Metal sheet 11: Light-blocking sheet 11A: Light-shielding sheet 18: Groove (etched area) 20: Light Reduction Space ARF: Microstructured Antireflective Coating BF1: Black film (first black film) BF2: Black film (second black film) D: Depth DPSmin: Shortest distance from the opening to the first pressure-sensitive adhesive layer. L: Light OP: Open PSA1: First pressure-sensitive adhesive PSA2: Second pressure-sensitive adhesive R1, R2: Areas S1: First reflecting surface S2: Second reflecting surface S3: Third reflecting surface S4: Fourth reflecting surface Tm: Maximum thickness of the metal sheet Tmp: The thickness of the area where the metal sheet contacts the first pressure-sensitive adhesive.

Claims

1. A metal light-collecting assembly, comprising: a metal sheet; and a light-shielding sheet having an opening, the light-shielding sheet being disposed on a surface of the metal sheet, wherein a region near the opening of the light-shielding sheet and a gap between the metal sheet and the light-shielding sheet are defined as a light-collecting space, the light-collecting space having the ability to attenuate stray light entering the light-collecting space through the opening.

2. The metal light-collecting assembly as claimed in claim 1, wherein the surface of the metal sheet has a first black film.

3. The metal light-collecting assembly as claimed in claim 1, wherein the metal light-collecting assembly further includes a first pressure-sensitive adhesive disposed between the metal sheet and the light-shielding sheet, wherein A is defined as an area of ​​the light-shielding sheet, B is defined as an area of ​​the first pressure-sensitive adhesive, C is defined as an area of ​​the opening, and satisfies the condition A > B + C.

4. The metal light-collecting assembly as claimed in claim 3, wherein the condition A-(B+C)>4.40 mm2 is further satisfied.

5. The metal light-collecting assembly as claimed in claim 3, further satisfying the condition 3.20 ≤ DPSmin / Tpsa1 ≤ 12.00, where DPSmin is the shortest distance from the opening to the first pressure-sensitive adhesive, and Tpsa1 is the thickness of the first pressure-sensitive adhesive.

6. The metal light-collecting component as claimed in claim 3, further satisfying the conditions 0.15mm≦DPSmin≦0.40mm and 0.03mm≦Tpsa1≦0.05mm, where DPSmin is the shortest distance from the opening to the first pressure-sensitive adhesive, and Tpsa1 is the thickness of the first pressure-sensitive adhesive.

7. The metal light-collecting assembly as claimed in claim 3, wherein the area of ​​the light-shielding sheet not adhered to the first pressure-sensitive adhesive is defined as D, and satisfies the condition D > C.

8. The metal light-collecting assembly as claimed in claim 3, wherein the metal sheet includes an etched region, and an area of ​​the etched region is defined as E, satisfying the condition E > B.

9. The metal light-collecting component as described in claim 3 further satisfies the condition 0.07mm≦Tmp+Tpsa1+Tsoma≦0.10mm, where Tmp is defined as the thickness of the area where the metal sheet contacts the first pressure-sensitive adhesive, Tpsa1 is the thickness of the first pressure-sensitive adhesive, and Tsoma is the thickness of the light-shielding sheet.

10. The metal light-collecting assembly as claimed in claim 3, further comprising a second pressure-sensitive adhesive disposed on the metal sheet, satisfying the condition 0.93≦(Tm+Tpsa2) / (Tmp+Tpsa1+Tsoma)≦1.05, wherein Tpsa2 is a thickness of the second pressure-sensitive adhesive, Tm is a maximum thickness of the metal sheet, Tmp is a thickness of the area of ​​the metal sheet in contact with the first pressure-sensitive adhesive, Tpsa1 is a thickness of the first pressure-sensitive adhesive, and Tsoma is a thickness of the light-shielding sheet.

11. The metal light-collecting assembly as claimed in claim 10, wherein the second pressure-sensitive adhesive is designed in a U-shape and surrounds the light-shielding sheet.

12. An optical lens imaging module, comprising: a lens barrel; an optical imaging lens disposed in the lens barrel; a light reflecting element disposed in the lens barrel, the light reflecting element comprising a first reflecting surface, a second reflecting surface, a third reflecting surface, and a fourth reflecting surface; a metal light collecting assembly disposed on the outer surface of one of the first reflecting surface, the second reflecting surface, the third reflecting surface, and the fourth reflecting surface, wherein the metal light collecting assembly comprises a metal sheet and a light-shielding sheet having an opening, the light-shielding sheet being disposed on a surface of the metal sheet, wherein the area near the opening of the light-shielding sheet and the gap between the metal sheet and the light-shielding sheet is defined as a light collecting space, the light collecting space having the ability to attenuate stray light entering the light collecting space through the opening.

13. The optical lens imaging module as claimed in claim 12, wherein the metal light-collecting component is disposed on the outer surface of the third reflective surface of the light-reflecting element.

14. The optical lens imaging module of claim 12, wherein the light reflecting element has a light-transmitting region and a non-light-transmitting region, the surface of the light-transmitting region has a microstructured anti-reflective film, the surface of the non-light-transmitting region has a second black film, the metal light-collecting component is attached to the non-light-transmitting region by a second pressure-sensitive adhesive, and the light-shielding sheet is disposed on the light-transmitting region.

15. The optical lens imaging module as claimed in claim 14, wherein X is defined as a thickness of the second black film, Y is defined as a thickness of the microstructure antireflective coating, and satisfies the condition X > Y.

Images