Optical imaging lens

Abstract

The invention provides an optical imaging lens which sequentially comprises a first lens group and a second lens group from an object side to an image side along an optical axis, a lens barrel is provided with a front end part close to the object side and a rear end part close to the image side, the rear end part is provided with an adhesive surface facing the image side, the first lens group is arranged and fixed in the lens barrel, and the second lens group is arranged and fixed in the lens barrel. The second lens group is provided with an assembling part which is fixed on the pasting surface of the lens barrel through a colloid, the optical imaging lens meets the following conditions: 0.95 < = ODG2 / ODB < = 1.05 and 18 < = ODG2 / Wba < = 58, ODG2 is the maximum outer diameter of the second lens group, ODB is the maximum outer diameter of the lens barrel, and Wba is the maximum width of the pasting surface of the rear end part in the radial direction.

Description

Technical Field

[0001] This invention relates to the field of optics, and more particularly to an improved optical lens design structure having a smaller lens barrel and a second lens group that is at least partially exposed outside the lens barrel, which is beneficial for reducing the size of the optical imaging lens. Background Technology

[0002] The specifications of portable electronic devices are constantly evolving, and their key components—optical imaging lenses—are also becoming increasingly diverse. The main lens for portable electronic devices not only requires a larger aperture and a shorter system length, but also demands higher pixels and higher resolution. High pixels and high resolution imply an increase in the number and outer diameter of lenses to improve image height and quality. However, increasing the number and outer diameter of lenses increases the size and weight of the lens, requiring a more powerful voice coil motor (VCM) for focusing. A more powerful VCM also means a larger VCM is needed to generate that greater driving force. Therefore, the installation space for optical imaging lenses does not increase linearly.

[0003] A greater challenge is that portable electronic devices also strive for thinness and lightness, thus limiting internal installation space. Therefore, how to increase the lens's outer diameter to improve image height and image quality while maintaining or even reducing the lens's outer diameter is a contradictory problem that needs to be solved. Summary of the Invention

[0004] The present invention provides an optical imaging lens, comprising a first lens group and a second lens group sequentially along an optical axis from an object side to an image side. A lens barrel has a front end near the object side and a rear end near the image side, and the rear end has an adhesive surface facing the image side. The first lens group is disposed and fixed in the lens barrel, and the second lens group has an assembly part, which is fixed to the adhesive surface of the lens barrel via an adhesive. The optical imaging lens satisfies the following conditions: 0.95≦ODG2 / ODB≦1.05 and 18≦ODG2 / Wba≦58, where ODG2 is the maximum outer diameter of the second lens group, ODB is the maximum outer diameter of the lens barrel, and Wba is the maximum radial width of the adhesive surface at the rear end.

[0005] In some embodiments of the present invention, the optical imaging lens may also satisfy the following condition: 1.05≦2ImgH / ODG2≦1.25, where ImgH is the image height of the optical imaging lens.

[0006] In some embodiments of the present invention, the optical imaging lens may also satisfy the following conditions: 0.32mm≦Wmi≦0.48mm, and 18≦ODG2 / Wmi≦45, wherein the assembly portion of the second lens group has an image-side surface, and Wmi is the maximum radial width of the image-side surface of the assembly portion of the second lens group.

[0007] In some embodiments of the present invention, the optical imaging lens may also satisfy the following condition: 1.07≦ODG2 / ODG1≦1.22, wherein the first lens group contains a plurality of lenses, wherein the lens with the largest outer diameter is the last lens counted from the object side to the image side, and ODG1 is the largest outer diameter of the first lens group.

[0008] In some embodiments of the present invention, the optical imaging lens may also satisfy the following condition: 16≦ODG2 / W2g≦58, where W2g is the maximum width of the assembly part of the second lens group bonded to the colloid in the radial direction.

[0009] In some embodiments of the present invention, the optical imaging lens may also satisfy the following condition: 10.7≦ODG2 / Wmo≦15.7, where Wmo is the maximum radial width of the object side of the assembly portion of the second lens group.

[0010] In some embodiments of the present invention, the optical imaging lens may also satisfy the following condition: 8.3≦TG1 / TG2≦10.5, where TG1 is the thickness of the first lens group on the optical axis and TG2 is the thickness of the second lens group on the optical axis.

[0011] In some embodiments of the present invention, the optical imaging lens may also satisfy the following condition: 1.02≦ODG2 / IDa≦1.14, where IDa is the minimum inner diameter of the adhesive surface.

[0012] In some embodiments of the present invention, the optical imaging lens may also satisfy the following condition: 18≦ODG2 / Wba≦32, wherein the optical imaging lens further satisfies the following condition: 18≦ODG2 / Wba≦32.

[0013] In some embodiments of the present invention, the optical imaging lens may also satisfy the following condition: 32≦ODG2 / Wba≦60, wherein the optical imaging lens has a fixing ring disposed between the first lens group and the second lens group, and the assembly part of the second lens group has a raised platform that is fitted into the rear end of the lens barrel.

[0014] In some embodiments of the present invention, the optical imaging lens may also satisfy the following conditions: Dn≦0.05mm, and 6 degrees≦Nn×α≦240 degrees, wherein the circumference of the raised platform has a plurality of grooves extending toward the optical axis, Dn is the depth of the groove, Nn is the number of grooves, and α is the angle of the groove.

[0015] The present invention is characterized in that, in some embodiments, since all lenses are housed within the lens barrel, the size of the lens barrel needs to be designed to be larger than the lens group. As the number of lenses increases, the size of the lens barrel and other peripheral components, such as the voice coil motor, also increases, which is detrimental to the miniaturization of the optical imaging lens. To solve this problem, in other embodiments, at least partially, one lens (i.e., the second lens group) of the optical imaging lens is disposed on the outer side of the lens barrel. The second lens group is then fixed to the lens barrel by bonding or fitting. In other words, the size of the lens barrel does not need to be larger than the second lens group; instead, the lens barrel can be designed to have the same or similar outer diameter as the second lens group. This reduces the size of the optical imaging lens barrel and also lowers the overall size of the optical imaging lens, which is beneficial for component miniaturization. Attached Figure Description

[0016] Figure 1 A cross-sectional structural schematic diagram of the optical imaging lens according to the first embodiment of the present invention is shown.

[0017] Figure 2 A cross-sectional structural schematic diagram of the optical imaging lens according to a second embodiment of the present invention is shown.

[0018] Figure 3 An enlarged cross-sectional schematic diagram of the optical imaging lens according to a second embodiment of the present invention is shown.

[0019] Figure 4 A cross-sectional structural schematic diagram of the optical imaging lens according to a third embodiment of the present invention is shown.

[0020] Figure 5 A cross-sectional structural schematic diagram of the optical imaging lens according to the fourth embodiment of the present invention is shown.

[0021] Figure 6 A cross-sectional structural schematic diagram of the optical imaging lens according to the fifth embodiment of the present invention is shown.

[0022] Figure 7 An enlarged cross-sectional schematic diagram of the optical imaging lens according to the fifth embodiment of the present invention is shown.

[0023] Figure 8 A top view and a corresponding cross-sectional schematic diagram of the second lens group of the optical imaging lens according to the fifth embodiment of the present invention are shown.

[0024] Figure 9 A cross-sectional structural schematic diagram of the optical imaging lens according to the sixth embodiment of the present invention is shown.

[0025] Figure 10 A cross-sectional structural schematic diagram of the optical imaging lens according to the seventh embodiment of the present invention is shown.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1, 2, 3, 4, 5, 6, 7: Optical imaging lenses;

[0028] 10: Lens tube; 11: Front end; 12: Rear end; 13: Adhesive surface; 14: Object side; 15: Image side;

[0029] 16: Raised platform; 17: Outer annular surface; 18: Inner annular surface; 20: Groove;

[0030] A1: Object side; A2: Image side;

[0031] G1: First lens group; G2: Second lens group; I: Optical axis; IDa: Minimum inner diameter of the adhesive surface

[0032] L1: First lens; L2: Second lens; L3: Third lens; L4: Fourth lens; L5: Fifth lens; L6: Sixth lens; L7: Seventh lens; L8: Eighth lens; L9: Ninth lens;

[0033] ODG1: Maximum outer diameter of the first lens group; ODG2: Maximum outer diameter of the second lens group;

[0034] P1: Optical effective part; P2: Assembly part; R: Fixing ring;

[0035] TG1: Thickness of the first lens group on the optical axis; TG2: Thickness of the second lens group on the optical axis; W2g: Maximum width of the assembly part of the second lens group bonded to the adhesive in the radial direction; Wba: Maximum width of the adhesive surface of the rear end in the radial direction; Wmi: Maximum width of the image side of the assembly part of the second lens group in the radial direction; Wmo: Maximum width of the object side of the assembly part of the second lens group in the radial direction. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] First Embodiment

[0039] like Figure 1As shown, Figure 1 A cross-sectional structural schematic diagram of the optical imaging lens according to a first embodiment of the present invention is shown. Figure 1 As shown, an optical imaging lens 1 mainly comprises multiple lenses disposed within a lens barrel 10. Taking this embodiment as an example, along the optical axis I from an object side A1 to an image side A2, the multiple lens groups sequentially include a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. That is, the optical imaging lens in this embodiment comprises a total of seven lenses disposed within the lens barrel 10. In addition, the optical imaging lens 1 in this embodiment also includes a fixing ring R, the function of which is to fix the lenses within the lens barrel 10 to prevent lens displacement.

[0040] Wherein, optical axis I is the optical axis of the entire optical imaging lens 1, so the optical axis of each lens is the same as the optical axis of the optical imaging lens 1. When light emitted from the object to be photographed (not shown) located on the object side A1 enters the optical imaging lens 1 of the present invention, it will pass through the first lens L1 to the seventh lens L7 in sequence, and then be focused on the imaging surface (not shown) on the image side A2 to form a clear image.

[0041] Furthermore, although the optical imaging lens 1 in this embodiment contains seven lenses, it is understood that the present invention can also be applied to optical imaging lenses with different numbers of lenses, which will be stated in advance here.

[0042] In this embodiment, all seven lenses of the optical imaging lens 1 are housed within the lens barrel 10. This means that, as seen in the cross-sectional view, the lens barrel 10 needs a sufficiently large space to accommodate the seven lenses. However, with advancements in optical technology, optical imaging lenses with more lenses are increasingly being developed and applied in commercially available electronic products. As the number of lenses in an optical imaging lens increases, not only is a larger lens barrel required to accommodate each lens, but the size of other peripheral components outside the optical imaging lens, such as the voice coil motor (VCM) used to drive the lens, also increases accordingly. According to the applicant's experimental observations, when the number of lenses in an optical imaging lens exceeds seven, the total volume occupied by each component increases significantly at a non-linear rate, thus hindering the miniaturization of the optical imaging lens. Taking this embodiment as an example, all seven lenses are housed within the lens barrel 10, and the maximum outer diameter of the lens barrel is approximately 12.800 mm.

[0043] Therefore, to address the problem of excessively large lens barrel size, other optical imaging lenses with different structures are proposed in the following embodiments of the invention, particularly adjusting the configuration of the lens barrel and the lens closest to the image side A2. It is worth noting that since the following embodiments will focus on describing the relationship between the lens barrel 10 and the lens closest to the image side A2, the lenses disposed inside the lens barrel 10, other than the lens barrel 10 and the lens closest to the image side A2, will be omitted and not drawn. For example, when the optical imaging lens contains seven lenses, the other six lenses L1 to L6, besides the seventh lens L7, will be omitted and not drawn. However, those skilled in the art will clearly understand that in the embodiments of the invention, the lens barrel 10 still contains a plurality of lenses, and the configuration and surface shape of each lens, under the various conditions mentioned in the invention, allow light to be clearly imaged onto the imaging surface after passing through the optical imaging lens.

[0044] The following description will focus on different embodiments of the present invention. For the sake of simplicity, the description will mainly focus on the differences between the embodiments and will not repeat the same points. In addition, the same elements in the various embodiments of the present invention are identified by the same reference numerals to facilitate comparison between the embodiments.

[0045] Second Embodiment

[0046] Please refer to Figure 2 and Figure 3 , Figure 2 A cross-sectional structural schematic diagram of the optical imaging lens according to a second embodiment of the present invention is shown. Figure 3 An enlarged cross-sectional schematic diagram of the optical imaging lens according to a second embodiment of the present invention is shown. Figure 2 As shown, the optical imaging lens 2 includes multiple lenses and a lens barrel 10. In this embodiment, the optical imaging lens 2 has a total of seven lenses. The seventh lens L7, closest to the image side A2, is defined as the second lens group G2, and the remaining six lenses are defined as the first lens group G1. As mentioned above, since the main feature of this invention lies in the relationship between the lens barrel 10 and the second lens group G2, the lenses of the first lens group G1 are not shown in the figures. However, it is understood that the configuration and surface shape parameters of the lenses included in the first lens group G1 and the second lens group G2, under the various conditions mentioned in this invention, can enable light to be clearly imaged on the imaging surface after passing through the optical imaging lens.

[0047] The feature of this embodiment is that the first lens group G1 is disposed and fixed inside the lens barrel 10, while the second lens group G2 is located outside the lens barrel 10 and is attached to the lens barrel 10. More specifically, the lens barrel 10 defines a front end portion 11 near the object side A1 and a rear end portion 12 near the image side A2, and the rear end portion 12 includes an adhesive surface 13 facing the image side A2. In addition, the second lens group G2 (the seventh lens L7 in this embodiment) may include an optical effective part P1 and an assembly part P2. Here, the optical effective part P1 is the part that allows imaging light to pass through. That is, the imaging light emitted from the object side A1 will pass through the optical effective parts of the first lens group and the second lens group and be focused on the imaging surface to form a clear image. For the sake of simplicity, only the optical effective part P1 of the second lens group G2 (the seventh lens L7) is shown here, but it can be understood that each lens of the first lens group G1 includes an optical effective part for imaging light to pass through. The assembly portion P2 of the second lens group G2 is used to assemble the second lens group G2 with the lens barrel 10. More specifically, during the fabrication of the second lens group G2, the area closest to the edge (or furthest from the optical axis I) is used to connect the second lens group G2 with the lens barrel 10, and the imaging light does not pass through the assembly portion P2. In this embodiment, the assembly portion P2 of the second lens group G2 has an object-side surface 14 facing the object side A1 and an image-side surface 15 facing the image side A2. An adhesive (not shown) can be used to bond the adhesive surface 13 of the lens barrel 10 facing the image side A2 to the object-side surface 14 of the assembly portion P2 of the second lens group G2. That is, in this embodiment, the second lens group G2 is not located inside the lens barrel 10, but is bonded to the adhesive surface 13 of the lens barrel 10 by an adhesive. Furthermore, from... Figure 2 As can be seen, the fixing ring R is located between the first lens group G1 and the second lens group G2. Specifically, the first lens group G1 is fixed inside the lens barrel 10 by the fixing ring R, while the second lens group G2 is located outside the fixing ring R.

[0048] Please refer to the following. Figure 2 and Figure 3 Here, we first define the important parameters in this invention as follows. Firstly, the "radial direction" in this invention refers to the direction radiating outwards from the position of optical axis I and perpendicular to optical axis I. From a three-dimensional perspective, the radial direction includes an infinite number of directions, but from... Figure 2 or Figure 3 From the cross-sectional view, the optical axis I extends along the Z direction, while the radial direction is perpendicular to the Z axis, meaning that the radial direction is parallel to the Y axis.

[0049] ODG1 is defined as the maximum outer diameter of the first lens group G1, i.e. Figure 2As shown, the first lens group G1 includes multiple lenses, one of which has the largest outer diameter. ODG1 is the outer diameter of this lens with the largest outer diameter. The outer diameter is defined as the maximum width of the lens in the radial direction (Y direction), which is the width from the uppermost edge to the lowermost edge of the lens along the radial direction (Y-axis direction), or twice the width from the optical axis I to the edge of the lens with the largest outer diameter in the first lens group G1 in the radial direction (Y-axis direction). In this embodiment, the lens with the largest outer diameter in the first lens group G1 is the last lens counting from the object side A1 to the image side. That is, in this embodiment, the first lens group G1 includes six lenses L1 to L6, arranged sequentially from the object side A1 to the image side A2, and the lens with the largest outer diameter is the sixth lens L6, which is the lens closest to the image side A2.

[0050] ODG2 is defined as the maximum outer diameter of the second lens group G2. Since the second lens group G2 in this embodiment is the seventh lens L7, ODG2 is also the maximum width of the seventh lens L7 in the radial direction, or twice the width in the radial direction (Y-axis direction) from the optical axis I to the edge of the assembly part P2 of the second lens group G2.

[0051] ODB is defined as the maximum outer diameter of the lens barrel 10, which is also the maximum width of the lens barrel 10 in the radial direction. Wba is defined as the maximum width in the radial direction of the adhesive surface 13 at the rear end 12 of the lens barrel 10. (See reference...) Figure 2 and Figure 3 The definition indicated.

[0052] Wmo is the maximum width of the object-side surface 14 of the assembly portion P2 of the second lens group G2. As described above, the second lens group G2 includes an optically active portion P1 that is close to the optical axis I and allows imaging light to pass through, and an assembly portion P2 that is far from the optical axis I and does not allow imaging light to pass through. Here, Wmo is the maximum width of the object-side surface 14 of the assembly portion P2 of the second lens group G2, or Wmo is the maximum width of the object-side surface 14 along the Y direction from the upper edge of the assembly portion P2 of the second lens group G2 to the upper edge of the optically active portion P1.

[0053] Wmi is the maximum width of the image-side surface 15 of the assembly portion P2 of the second lens group G2. As described above, the second lens group G2 includes an optically effective portion P1 that is close to the optical axis I and allows imaging light to pass through, and an assembly portion P2 that is far from the optical axis I and does not allow imaging light to pass through. Here, Wmi is the maximum width of the image-side surface 15 of the assembly portion P2 of the second lens group G2, or Wmi is the maximum width of the image-side surface 15 along the Y direction from the upper edge of the assembly portion P2 of the second lens group G2 to the upper edge of the optically effective portion P1.

[0054] W2g represents the maximum width of the bonding between the assembly part P2 of the second lens group G2 and the colloid (not shown in the figure) in the radial direction (Y direction). Please refer to... Figure 3 The enlarged schematic diagram shows that, in order to bond the second lens group G2 to the adhesive surface 13, adhesive is injected between the object side 14 of the assembly part P2 of the second lens group G2 and the adhesive surface 13 of the lens barrel 10. Here, W2g is the maximum width of the injected adhesive. W2g differs from Wmo mentioned above. Wmo is the maximum width along the Y direction on the object side 14 from the upper edge of the assembly part P2 of the second lens group G2 to the upper edge of the optically effective part P1 (or the boundary where light can pass through), while W2g is the maximum width along the Y direction on the object side 14 from the upper edge of the assembly part P2 of the second lens group G2 to the lower edge of the adhesive. Typically, W2g is smaller than Wmo to prevent excessive adhesive overflow from covering the optically effective part P1 and affecting light imaging.

[0055] Additionally, ImgH is defined as the image height of the optical imaging lens. TG1 is defined as the thickness of the first lens group G1 along the optical axis I, which is the maximum thickness of the first lens group G1 along the Z direction. TG2 is defined as the thickness of the second lens group G2 along the optical axis I, which is the maximum thickness of the second lens group G2 along the Z direction. Taking this embodiment as an example, TG1 is the thickness along the optical axis I (or Z direction) from the intersection of the object-side surface of the first lens L1 and the optical axis I to the intersection of the image-side surface of the sixth lens L6 and the optical axis I, while TG2 is the thickness of the seventh lens L7 along the optical axis I.

[0056] IDa is defined as the minimum inner diameter of the adhesive surface 13 at the rear end 12 of the lens barrel 10. That is, from the cross-sectional view, it is twice the width of the lower edge of the adhesive surface 13 to the optical axis I in the radial direction, or the maximum outer diameter ODB of the lens barrel 10 minus twice the maximum width Wba of the adhesive surface.

[0057] In this embodiment, the values ​​of each parameter are shown in Table 1 below.

[0058]

[0059]

[0060] Table 1

[0061] In the first embodiment described above, since all lenses are located inside the lens barrel 10, the maximum outer diameter (ODB) of the lens barrel 10 is approximately 12.800 mm. In this embodiment, because the second lens group is located outside the lens barrel 10, the lens barrel 10 does not need to house all the lenses, and the size of the lens barrel 10 can be reduced accordingly. Compared to the first embodiment described above, the ODB of this embodiment can be reduced from approximately 12.800 mm to approximately 11.000 mm. This is beneficial for component miniaturization.

[0062] Third Embodiment

[0063] Please refer to Figure 4 , Figure 4 A cross-sectional structural schematic diagram of the optical imaging lens according to a third embodiment of the present invention is shown. Figure 4 As shown, the optical imaging lens 3 includes multiple lenses and a lens barrel 10. In this embodiment, the optical imaging lens 3 has a total of seven lenses. The seventh lens L7, which is closest to the image side A2, is defined as the second lens group G2, and the remaining six lenses are defined as the first lens group G1. For the sake of simplicity, the individual lenses of the first lens group G1 are not shown in the diagram. However, it is understood that the configuration and surface shape parameters of the lenses included in the first lens group G1 and the second lens group G2, under the various conditions mentioned in this invention, can enable light to be clearly imaged on the imaging surface after passing through the optical imaging lens.

[0064] The difference between this embodiment and the second embodiment described above lies in the different surface shapes and other parameters of each lens. For example... Figure 4 As shown, the shapes of the lenses included in the optical imaging lens 3 differ from those described in the second embodiment. However, similar to the second embodiment, the first lens group 10 is disposed and fixed inside the lens barrel 10, while the second lens group G2 is also disposed outside the lens barrel 10 and adhered to it. In this way, since the lens barrel 10 does not need to accommodate all the lenses, the design size of the lens barrel 10 can be reduced.

[0065] As can be understood from this embodiment, the concept of the present invention can be applied to lens groups with different surface shapes, achieving the same function of imaging light and reducing the size of the component. For example, according to the applicant's experimental results, when the lens group included in this embodiment is completely placed inside the lens barrel, the measured maximum outer diameter (ODB) of the lens barrel is approximately 10.800 mm. However, since the second lens group G2 is placed outside the lens barrel 10 in this embodiment, the ODB can be reduced from 10.800 mm to 9.080 mm, which is beneficial for component miniaturization. The definitions of other parameters are the same as those described in the second embodiment above, and will not be repeated here.

[0066] In this embodiment, the values ​​of each parameter are shown in Table 2 below.

[0067]

[0068]

[0069] Table 2

[0070] Fourth embodiment

[0071] Please refer to Figure 5 , Figure 5 A cross-sectional structural schematic diagram of the optical imaging lens according to a fourth embodiment of the present invention is shown. Figure 5 As shown, the optical imaging lens 4 includes multiple lenses and a lens barrel 10. In this embodiment, the optical imaging lens 4 has a total of nine lenses. The ninth lens L9, which is closest to the image side A2, is defined as the second lens group G2, and the remaining eight lenses are defined as the first lens group G1. For the sake of simplicity, the individual lenses of the first lens group G1 are not shown in the diagram. However, it is understood that the configuration and surface shape parameters of the lenses included in the first lens group G1 and the second lens group G2, under the various conditions mentioned in this invention, can enable light to be clearly imaged on the imaging surface after passing through the optical imaging lens.

[0072] This embodiment differs from the second embodiment described above in that the number and surface shape of each lens are different. For example... Figure 5 As shown, the shapes of the lenses included in the optical imaging lens 4 differ from those described in the second embodiment above. Furthermore, this embodiment also includes more lenses (a total of nine lenses). However, similar to the second embodiment, the first lens group 10 is disposed and fixed inside the lens barrel 10, while the second lens group G2 is similarly disposed outside the lens barrel 10 and adhered to it. In this way, since the lens barrel 10 does not need to accommodate all the lenses, the design size of the lens barrel 10 can be reduced.

[0073] As can be understood from this embodiment, the concept of the present invention can be applied to lens groups with different surface shapes and different numbers of lenses, achieving the same function of imaging light and reducing the size of the component. For example, according to the applicant's experimental results, when the lens group included in this embodiment is completely placed inside the lens barrel, the measured maximum outer diameter (ODB) of the lens barrel is approximately 16.400 mm. However, since the second lens group G2 is placed outside the lens barrel 10 in this embodiment, the ODB can be reduced from 16.400 mm to 14.600 mm, which is beneficial for component miniaturization. In addition, the concept of the present invention can also be applied to optical imaging lenses with different numbers of lenses, such as lens groups with seven, eight, nine, ten, or other numbers of lenses, which are also within the scope of application of the present invention.

[0074] It is worth noting that, in this embodiment, since there are nine lenses, the last lens counting from the object side A1 to the image side in the first lens group G1 is the eighth lens L8, where the eighth lens L8 may be the lens with the largest outer diameter in the first lens group G1. The second lens group G2 contains the ninth lens L9. The definitions of other parameters are the same as described in the second embodiment above, and will not be repeated here.

[0075] In this embodiment, the values ​​of each parameter are shown in Table 3 below.

[0076] parameter Numerical value (unit: mm) ODG1 12.832 ODG2 14.500 ODB 14.600 Wba 0.691 Wmi 0.340 W2g 0.807 Wmo 0.895 ImgH 8.000 TG1 9.442 TG2 0.935 IDa 13.217

[0077] Table 3

[0078] Fifth embodiment

[0079] Please refer to Figure 6 , Figure 7 and Figure 8 , Figure 6 A cross-sectional structural schematic diagram of the optical imaging lens according to the fifth embodiment of the present invention is shown. Figure 7 An enlarged cross-sectional schematic diagram of the optical imaging lens according to the fifth embodiment of the present invention is shown. Figure 8 A top view and a corresponding cross-sectional schematic diagram of the second lens group of the optical imaging lens according to a fifth embodiment of the present invention are shown. Figure 6 As shown, the optical imaging lens 5 includes multiple lenses and a lens barrel 10. In this embodiment, the optical imaging lens 5 has a total of seven lenses. The seventh lens L7, which is closest to the image side A2, is defined as the second lens group G2, and the remaining six lenses are defined as the first lens group G1. For the sake of simplicity, the individual lenses of the first lens group G1 are not shown in the diagram. However, it is understood that the configuration and surface shape parameters of the lenses included in the first lens group G1 and the second lens group G2, under the various conditions mentioned in this invention, can enable light to be clearly imaged on the imaging surface after passing through the optical imaging lens.

[0080] Furthermore, this embodiment differs from the second embodiment described above in that, in the second embodiment, the adhesive surface 13 of the second lens group G2 and the lens barrel 10 is bonded together with an adhesive layer. However, in this embodiment, the second lens group G2 and the lens barrel 10 are not only bonded together with an adhesive layer, but also connected to each other in a fitting manner. More specifically, from the cross-sectional view, the second lens group G2 in this embodiment has a raised platform 16, as seen from the top view ( Figure 8As seen from the image, the outline of the raised platform 16 is roughly circular. In this embodiment, the raised platform 16 serves to provide a protruding structural portion, allowing the second lens group G2 to be joined to the rear end portion 12 of the lens barrel 10 via a fitting method. In other words, the raised platform 16 of the second lens group G2 has an outer ring surface 17, while the rear end portion 12 of the lens barrel 10 has an inner ring surface 18. When the second lens group G2 and the lens barrel 10 are fitted together, the outer ring surface 17 of the raised platform 16 can contact the inner ring surface 18 of the rear end portion 12 of the lens barrel 10. By using this fitting design to join the second lens group G2 and the lens barrel 10, the assembly process and time of 5-axis alignment can be omitted. Furthermore, in this embodiment, in addition to fixing by fitting, an adhesive (not shown) can be selectively used to bond the adhesive surface 13 of the lens barrel 10 facing the image side A2 to the object side surface 14 of the assembly portion P2 of the second lens group G2, further enhancing the bonding strength.

[0081] from Figure 8 The raised platform 16 of the second lens group G2 has a circular outer annular surface 17. Furthermore, in some embodiments, the outer annular surface 17 of the raised platform 16 also includes a plurality of grooves 20 extending toward the optical axis I. Figure 8 Looking at the two corresponding cross-sectional structures, the cross-sectional structure at the groove 20 still has a raised platform 16, but its height is lower than the height of the raised platforms 16 at other non-groove locations 20. Here, the height difference between the two raised platforms can be defined as Dn, where Dn can also represent the depth of the groove 20. Additionally, as... Figure 8 As shown, Nn is defined here as the total number of grooves 20, and α is the angle of each groove 20.

[0082] The purpose of forming the groove 20 here is that, after the second lens group G2 and the rear end portion 12 of the lens barrel 10 are fitted together, the manufacturer can inject colloid between the second lens group G2 and the rear end portion 12 of the lens barrel 10 to further enhance the bonding strength. When the colloid is injected, it can flow along the groove 20 to the inner annular surface 18 of the rear end portion 12 of the lens barrel 10. Therefore, the depth, number, and angle of the groove 20 will also affect the total amount of colloid injected. Table 4 below lists the groove depth Dn, the total number of grooves Nn, and the groove angle α of several different embodiments of the present invention. It is worth noting that the values ​​listed in Table 4 are only examples of some embodiments of the present invention, but the groove parameters of the present invention are not limited thereto.

[0083] Dn (unit: mm) Nn α (unit: degree) Example A 0.05 9 20 Example B 0.02 12 10 Example C 0.002 3 2 Example D 0.05 12 20

[0084] Table 4

[0085] In addition to the features described above, other parameter definitions of the present invention can be found in the second embodiment described above, and will not be repeated here.

[0086] In this embodiment, the values ​​of each parameter are shown in Table 5 below.

[0087]

[0088]

[0089] Table 5

[0090] Sixth Embodiment

[0091] Please refer to Figure 9 , Figure 9 A cross-sectional structural schematic diagram of the optical imaging lens according to the sixth embodiment of the present invention is shown. Figure 9 As shown, the optical imaging lens 6 includes multiple lenses and a lens barrel 10. In this embodiment, the optical imaging lens 6 has a total of seven lenses. The seventh lens L7, which is closest to the image side A2, is defined as the second lens group G2, and the remaining six lenses are defined as the first lens group G1. For the sake of simplicity, the individual lenses of the first lens group G1 are not shown in the diagram. However, it is understood that the configuration and surface shape parameters of the lenses included in the first lens group G1 and the second lens group G2, under the various conditions mentioned in this invention, enable light to be clearly imaged on the imaging surface after passing through the optical imaging lens.

[0092] The difference between this embodiment and the fifth embodiment described above lies in the different surface shapes and other parameters of each lens. For example... Figure 9 As shown, the shapes of the lenses included in the optical imaging lens 6 differ from those described in the second embodiment. However, similar to the fifth embodiment, the first lens group 10 is disposed and fixed inside the lens barrel 10, while the second lens group G2 is also disposed outside the lens barrel 10. The second lens group G2 has a protruding platform 16 and engages with the rear end portion 12 of the lens barrel 10. In this way, since the lens barrel 10 does not need to accommodate all the lenses, the design size of the lens barrel 10 can be reduced.

[0093] As can be understood from this embodiment, the concept of the present invention can be applied to lens groups with different surface shapes, and can also achieve the function of imaging light and reducing the size of the element. The definitions of other parameters are the same as those described in the fifth embodiment above, and will not be repeated here.

[0094] In this embodiment, the values ​​of each parameter are shown in Table 6 below.

[0095]

[0096]

[0097] Table 6

[0098] Seventh Embodiment

[0099] Please refer to Figure 10 , Figure 10 A cross-sectional structural schematic diagram of the optical imaging lens according to the seventh embodiment of the present invention is shown. Figure 10 As shown, the optical imaging lens 7 includes multiple lenses and a lens barrel 10. In this embodiment, the optical imaging lens 7 has a total of nine lenses. The ninth lens L9, which is closest to the image side A2, is defined as the second lens group G2, and the remaining eight lenses are defined as the first lens group G1. For the sake of simplicity, the individual lenses of the first lens group G1 are not shown in the diagram. However, it is understood that the configuration and surface shape parameters of the lenses included in the first lens group G1 and the second lens group G2, under the various conditions mentioned in this invention, can enable light to be clearly imaged on the imaging surface after passing through the optical imaging lens.

[0100] This embodiment differs from the fifth embodiment described above in that the number and surface shape of each lens are different. For example... Figure 10 As shown, the shapes of the lenses included in the optical imaging lens 7 differ from those described in the fifth embodiment above. Furthermore, this embodiment also includes more lenses (a total of nine lenses). However, similar to the fifth embodiment, the first lens group 10 is disposed and fixed inside the lens barrel 10, while the second lens group G2 is also disposed outside the lens barrel 10. The second lens group G2 has a raised platform 16 and engages with the rear end portion 12 of the lens barrel 10. In this way, since the lens barrel 10 does not need to accommodate all the lenses, the design size of the lens barrel 10 can be reduced.

[0101] As can be understood from this embodiment, the concept of the present invention can be applied to lens groups with different surface shapes and different numbers of lenses, achieving the same function of imaging light and reducing the size of the component. Furthermore, the concept of the present invention can also be applied to optical imaging lenses with different numbers of lenses, such as lens groups with seven, eight, nine, ten, or other numbers of lenses, which also fall within the scope of this invention.

[0102] It is worth noting that, in this embodiment, since there are nine lenses, the last lens counting from the object side A1 to the image side in the first lens group G1 is the eighth lens L8, where the eighth lens L8 may be the lens with the largest outer diameter in the first lens group G1. The second lens group G2 contains the ninth lens L9. The definitions of other parameters are the same as described in the second embodiment above, and will not be repeated here.

[0103] In this embodiment, the values ​​of each parameter are shown in Table 7 below.

[0104]

[0105]

[0106] Table 7

[0107] In various embodiments of the present invention, the following conditions are also satisfied, and corresponding advantages are described below.

[0108] 1. The optical imaging lens of the present invention is sequentially divided into a first lens group G1 and a second lens group from the object side A1 to the image side A2. The first lens group G1 is disposed and fixed in the lens barrel 10, and the second lens group G2 is at least partially exposed outside the lens barrel 10. The assembly part P2 of the second lens group G2 is fixed to the adhesive surface 13 of the rear end portion 12 of the lens barrel 10 by means of an adhesive (not shown) or / and by fitting. Since the lens barrel 10 does not need to completely accommodate the second lens group G2, it is advantageous to reduce the volume of the lens barrel 10 to reduce the outer diameter of the lens barrel 10.

[0109] 2. When the optical imaging lens meets the conditions of 0.95≦ODG2 / ODB≦1.05 and 18≦ODG2 / Wba≦58, it is beneficial to control the maximum outer diameter ODG2 of the second lens group G2, the maximum outer diameter ODB of the lens barrel 10, and the area of ​​the adhesive surface 13, while avoiding insufficient thickness of the lens barrel 10 or excessively small area of ​​the adhesive surface 13. This reduces the maximum outer diameter, volume, and weight of the lens, thereby enabling the module manufacturer to design a smaller voice coil motor for focusing the optical imaging lens.

[0110] 3. The optical imaging lens of the present invention preferably satisfies the condition 1.05 ≤ 2ImgH / ODG2 ≤ 1.25. When the above condition is met, it is beneficial to the lens barrel configuration of the optical imaging lens, so that the outer diameter of the optical imaging lens with a total image height of 12.96mm is reduced to less than 11mm.

[0111] 4. The optical imaging lens of the present invention preferably satisfies the conditions of 0.32mm≦Wmi≦0.48mm and 18≦ODG2 / Wmi≦45. When the above conditions are met, it is beneficial for the device for five-axis optical quality alignment to focus on the assembly part P2 of the second lens group G2.

[0112] 5. The optical imaging lens of the present invention preferably satisfies the condition 1.07 ≤ ODG2 / ODG1 ≤ 1.22, wherein the lens with the largest outer diameter in the first lens group G1 is the last lens counted from the object side A1 to the image side A2. When the above condition is satisfied, the outer diameter of the last lens of the first lens group G1 and the second lens group G2 are in an appropriate ratio, so that the refraction of light by these two lenses is conducive to increasing the half angle of view.

[0113] 6. The optical imaging lens of the present invention preferably satisfies the condition 16≦ODG2 / W2g≦58. When the above condition is met, it is beneficial to avoid the bonding area being insufficient due to an excessively large ratio, or the outer diameter of the lens being unable to be effectively reduced due to an excessively small ratio. The preferred limitation is 16≦ODG2 / W2g.

[0114] 7. The optical imaging lens of the present invention preferably satisfies the condition 10.7≦ODG2 / Wmo≦15.7. When the above condition is met, it is beneficial to avoid the adhesive easily overflowing into the optically effective part P1 of the lens due to an excessively large ratio, or the lens outer diameter not being effectively reduced due to an excessively small ratio.

[0115] 8. The optical imaging lens of the present invention preferably satisfies the condition 8.3≦TG1 / TG2≦10.5. When the above condition is met, it is beneficial to control the thickness of the first lens group G1 and the thickness of the second lens group G2 within a suitable range, so as to reduce the outer diameter of the lens.

[0116] 9. The optical imaging lens of the present invention preferably satisfies the condition 1.02≦ODG2 / IDa≦1.14. When the above condition is met, it is beneficial to avoid the ratio being too large to reduce the outer diameter of the lens, and also to avoid the ratio being too small to effectively bond and fix the second lens group G2 to the lens barrel 10.

[0117] 10. The optical imaging lens of the present invention preferably satisfies the condition 18≦ODG2 / Wba≦32. When the above conditions are met, it is beneficial to align and fix the lens with a five-axis optical quality alignment device, and it is also beneficial to pass the On-going Reliability Test (ORT).

[0118] 11. The optical imaging lens of the present invention preferably satisfies the condition 18≦ODG2 / Wba≦32. When the above conditions are met, it is beneficial to align and fix the lens with a five-axis optical quality alignment device, and it is also beneficial to pass the On-going Reliability Test (ORT). The preferred limitation is 18≦ODG2 / Wba≦27.

[0119] 12. The optical imaging lens of the present invention preferably satisfies the condition 32≦ODG2 / Wba≦60. When the above condition is met, the optical imaging lens has a fixing ring R disposed between the first lens group G1 and the second lens group G2, which is beneficial to reduce flare. The assembly part P2 of the second lens group G2 has a fitting structure with the rear end part 12 of the lens barrel 10, which is beneficial to positioning and assembly to shorten the assembly time.

[0120] 13. The optical imaging lens of the present invention preferably satisfies the conditions of Dn≦0.05mm and 6 degrees≦Nn×α≦240 degrees. When the above conditions are met, it is beneficial for the colloid to flow through the groove 20 to the space between the second lens group G2 and the lens barrel 10, thereby increasing the bonding area for fixation. In addition, by increasing the bonding area, the lens is better able to pass the continuous reliability verification.

[0121] Based on the foregoing description and drawings, the present invention is characterized in that, in some embodiments of the present invention (e.g.) Figure 1 In some embodiments of the invention (e.g., since all the lenses are housed within the lens barrel, the lens barrel needs to be larger than the lens group. As the number of lenses increases, the size of the lens barrel and other peripheral components, such as the voice coil motor, also increases, which is detrimental to the miniaturization of optical imaging lenses. To address these issues, in other embodiments of the invention (e.g.) Figures 2 to 7 In one embodiment, the lens closest to the image side (i.e., the second lens group) of the optical imaging lens is at least partially disposed on the outside of the lens barrel. The second lens group is then fixed to the lens barrel by bonding or fitting. In other words, the size of the lens barrel does not need to be designed to be larger than that of the second lens group. Instead, the lens barrel can be designed to have the same or similar outer diameter as the second lens group. This reduces the size of the lens barrel of the optical imaging lens and also reduces the overall size of the optical imaging lens, which is beneficial for the miniaturization of components.

[0122] 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.

Claims

1. An optical imaging lens, comprising, in sequence along an optical axis from an object side to an image side: A first lens group and a second lens group; A lens barrel has a front end near the object side and a rear end near the image side, and the rear end has an adhesive surface facing the image side. The first lens group is disposed and fixed in the lens barrel. The second lens group has an assembly part that is fixed to the adhesive surface of the lens barrel by an adhesive. The optical imaging lens satisfies the following conditions: 0.95≦ODG2 / ODB≦1.05 and 18≦ODG2 / Wba≦58, where ODG2 is the maximum outer diameter of the second lens group, ODB is the maximum outer diameter of the lens barrel, and Wba is the maximum radial width of the adhesive surface at the rear end.

2. The optical imaging lens as claimed in claim 1, wherein the optical imaging lens further satisfies the following condition: 1.05 ≤ 2ImgH / ODG2 ≤ 1.25, where ImgH is the image height of the optical imaging lens.

3. The optical imaging lens as claimed in claim 1, wherein the optical imaging lens further satisfies the following conditions: 0.32mm≦Wmi≦0.48mm, and 18≦ODG2 / Wmi≦45, wherein the assembly portion of the second lens group has an image-side surface, and Wmi is the maximum radial width of the image-side surface of the assembly portion of the second lens group.

4. The optical imaging lens as claimed in claim 1, wherein the optical imaging lens further satisfies the following condition: 1.07≦ODG2 / ODG1≦1.22, wherein the first lens group includes a plurality of lenses, wherein the lens with the largest outer diameter is the last lens counted from the object side to the image side, and ODG1 is the largest outer diameter of the first lens group.

5. The optical imaging lens as claimed in claim 1, wherein the optical imaging lens further satisfies the following condition: 16≦ODG2 / W2g≦58, where W2g is the maximum width of the assembly portion of the second lens group bonded to the adhesive in the radial direction.

6. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies the following condition: 10.7 ≦ ODG2 / Wmo ≦ 15.7, where Wmo is the maximum width of the object side of the assembly portion of the second lens group in the radial direction.

7. The optical imaging lens as claimed in claim 1, wherein the optical imaging lens further satisfies the following condition: 8.3≦TG1 / TG2≦10.5, where TG1 is the thickness of the first lens group on the optical axis and TG2 is the thickness of the second lens group on the optical axis.

8. The optical imaging lens as claimed in claim 1, wherein the optical imaging lens further satisfies the following condition: 1.02 ≤ ODG2 / IDa ≤ 1.14, where IDa is the minimum inner diameter of the adhesive surface.

9. The optical imaging lens as claimed in claim 1, wherein the optical imaging lens further satisfies the following condition: 18≦ODG2 / Wba≦32.

10. The optical imaging lens of claim 1, wherein the optical imaging lens further satisfies the following condition: 32≦ODG2 / Wba≦60, wherein the optical imaging lens has a retaining ring disposed between the first lens group and the second lens group, the assembly portion of the second lens group has a protruding platform, the protruding platform being fitted into the rear end portion of the lens barrel.

11. The optical imaging lens of claim 10, wherein the optical imaging lens further satisfies the following conditions: wherein the circumference of the raised platform has a plurality of grooves extending toward the optical axis, Dn is the depth of the groove, Nn is the number of grooves, α is the angle of the groove, Dn≦0.05mm, 6 degrees≦Nn×α≦240 degrees.

Images