Imaging lens system
Patent Information
- Application Number
- JP2022131823
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2021-08-31
- Filing Date
- 2022-08-22
- Publication Date
- 2025-09-01
AI Technical Summary
There is a demand for imaging lenses that are both miniaturized and capable of high magnification, particularly for small electronic devices like mobile phones, to capture images at a distance.
An imaging lens system comprising a first lens with a positive refractive power and a concave image-side surface, a first reflector with a concave object-side surface, a second lens with negative refractive power and a concave image-side surface, and a third lens with a concave image-side surface, along with reflective members, configured to increase the effective focal length while reducing the overall length.
The system achieves a small size with high magnification capabilities by increasing the effective focal length without increasing the overall length, making it suitable for integration into compact electronic devices.
Smart Images
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Abstract
Description
[Technical field]
[0001] The present invention relates to an imaging lens system capable of capturing an image of an object, and an electronic device including the same. [Background technology]
[0002] Recently, as image elements are becoming smaller and higher pixel counts are being developed, imaging lenses mounted on electronic devices are also required to have high optical performance and be compact. In particular, imaging lenses mounted on small electronic devices such as mobile phones are required to have high magnification characteristics suitable for imaging objects at long distances as well as being compact. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] U.S. Pat. No. 1,087,7354 Summary of the Invention [Problem to be solved by the invention]
[0004] It is an object of the present invention to provide an imaging lens system that is small in size and capable of realizing high magnification, and an electronic device including the imaging lens system. [Means for solving the problem]
[0005] The imaging lens system according to the present invention may include a first lens having positive refractive power and a concave image side surface, a first reflecting member disposed adjacent to the first lens and having a concave object side surface, a second lens having negative refractive power and a concave image side surface, a third lens disposed adjacent to the image side surface of the second lens, a second reflecting member disposed adjacent to the second lens or the third lens and having a convex image side surface, and an image sensor. The first lens, the second lens, and the third lens may be disposed in order from an object toward the image sensor, and the object side surface of the first reflecting member and the image side surface of the second reflecting member may include a reflecting surface.
[0006] The imaging lens system according to the present invention may include a first lens having a concave image side surface, a first reflecting member disposed adjacent to the first lens and having a concave object side surface, a second lens having a concave image side surface, a third lens having a concave image side surface, a second reflecting member disposed adjacent to the second lens or the third lens and having a convex image side surface, and an image sensor. The first lens, the second lens, and the third lens may be disposed in order from an object toward the image sensor, and the object side surface of the first reflecting member and the image side surface of the second reflecting member may include a reflecting surface. Effect of the Invention
[0007] According to the concept of the present invention, an imaging lens system can be configured to increase an overall effective focal length f while decreasing an overall length TTL. Thus, the imaging lens system can have a relatively small size and realize a high magnification. Thus, an imaging lens system that can realize a relatively small size and a high magnification and an electronic device including the same can be provided. [Brief description of the drawings]
[0008] [Figure 1]FIG. 1 is a front view of an imaging lens system according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram of an imaging lens system according to some embodiments of the present invention, showing a side view taken along II' in FIG. [Diagram 3] 3 is a front view showing the arrangement of a first lens and a first reflecting member in FIG. 2. [Figure 4] 3 is a front view showing the arrangement of a second lens and a second reflecting member in FIG. 2. [Diagram 5] 3 is a diagram for explaining dimensions of lenses and reflecting members constituting the imaging lens system of FIG. 2. [Figure 6] FIG. 2 is a schematic diagram of an imaging lens system according to some embodiments of the present invention, showing a side view taken along II' in FIG. [Figure 7] 7 is a front view showing the arrangement of the first lens and the first reflecting member in FIG. 6. FIG. [Figure 8] 7 is a front view showing the arrangement of the second and third lenses and the second reflecting member in FIG. 6. FIG. [Figure 9] 7 is a diagram for explaining dimensions of lenses and reflecting members constituting the imaging lens system of FIG. 6. [Figure 10] 1 is a cross-sectional side view of an electronic device including an imaging lens system according to an embodiment of the present invention. [Figure 11] FIG. 11 is an enlarged view of a portion PP in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0009] The present invention will now be described in detail by describing exemplary embodiments thereof with reference to the accompanying drawings.
[0010] Fig. 1 is a front view of an imaging lens system according to an embodiment of the present invention. Fig. 2 is a configuration diagram of an imaging lens system according to some embodiments of the present invention, and is a side view cut along II' in Fig. 1. Fig. 3 is a front view showing the arrangement of the first lens 110 and the first reflecting member 210 in Fig. 2, and Fig. 4 is a front view showing the arrangement of the second lens 120 and the second reflecting member 220 in Fig. 2. Fig. 5 is a diagram for explaining the dimensions of the lenses and reflecting members constituting the imaging lens system of Fig. 2.
[0011] 1 and 2, the imaging lens system 1000 may include a plurality of lenses 110, 120, 130, 140, 150, a plurality of reflecting members 210, 220, a filter 300, and an image sensor 400. The image sensor 400 may provide an image surface 400S on which light L incident through the plurality of lenses 110, 120, 130, 140, 150, the plurality of reflecting members 210, 220, and the filter 300 may be focused. The plurality of lenses 110, 120, 130, 140, 150 may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150, which are arranged in sequence from an object (subject) toward the image surface 400S of the image sensor 400. The plurality of reflecting members 210 and 220 may include a first reflecting member 210 and a second reflecting member 220 arranged in sequence from the object (subject) toward an image plane 400S of the image sensor 400.
[0012] The first lens 110 may have positive refractive power. The first lens 110 may have an object-side surface 112 and an image-side surface 114 facing each other. The object-side surface 112 of the first lens 110 may face the object (subject), and the image-side surface 114 of the first lens 110 may face an image plane 400S of the image sensor 400. The image-side surface 114 of the first lens 110 may have a concave shape. As an example, the object-side surface 112 of the first lens 110 may have a convex shape, and the image-side surface 114 of the first lens 110 may have a concave shape. The first lens 110 may be a spherical lens or an aspheric lens. When the first lens 110 is a spherical lens, the object side surface 112 and the image side surface 114 of the first lens 110 may be spherical, and when the first lens 110 is an aspheric lens, the object side surface 112 and the image side surface 114 of the first lens 110 may be aspheric. The first lens 110 may be made of, for example, glass or a plastic material.
[0013] The first reflecting member 210 may be disposed adjacent to the first lens 110. The first reflecting member 210 may have an object side surface 212 and an image side surface 214 facing each other. The object side surface 212 of the first reflecting member 210 may face the object (subject), and the image side surface 214 of the first reflecting member 210 may face the image plane 400S of the image sensor 400. The object side surface 212 of the first reflecting member 210 may have a concave shape. As an example, the object side surface 212 of the first reflecting member 210 may have a concave shape, and the image side surface 214 of the first reflecting member 210 may have a convex shape. The object side surface 212 of the first reflecting member 210 may include a reflective surface. The object side surface 212 of the first reflecting member 210 may be configured to reflect light incident from the image side surface 214 of the first reflecting member 210 to the second lens 120. The first reflecting member 210 may be an aspheric lens, and an object side surface 212 and an image side surface 214 of the first reflecting member 210 may be aspheric. The first reflecting member 210 may be made of a plastic material, for example.
[0014] 2 and 3, the first lens 110 may have a first hole 110H penetrating the center of the first lens 110, and therefore may have a ring shape. The first reflecting member 210 may be disposed to overlap the first hole 110H of the first lens 110 along a direction parallel to the optical axis AX of the imaging lens system 1000. The entire first reflecting member 210 may overlap the first hole 110H along a direction parallel to the optical axis AX, and as an example, the first reflecting member 210 may be disposed inside the first hole 110H.
[0015] 1 and 2 again, the second lens 120 may have negative refractive power. The second lens 120 may have an object side surface 122 and an image side surface 124 facing each other. The object side surface 122 of the second lens 120 may face an object (subject), and the image side surface 124 of the second lens 120 may face an image surface 400S of the image sensor 400. The image side surface 124 of the second lens 120 may have a concave shape. For example, the object side surface 122 of the second lens 120 may have a convex shape, and the image side surface 124 of the second lens 120 may have a concave shape. The second lens 120 may be an aspheric lens, and the object side surface 122 and the image side surface 124 of the second lens 120 may be aspheric. For example, the second lens 120 may be made of a plastic material.
[0016] According to some embodiments, the second reflecting member 220 may be disposed adjacent to the second lens 120. The second reflecting member 220 may have an object side surface 222 and an image side surface 224 facing each other. The object side surface 222 of the second reflecting member 220 may face the object (subject), and the image side surface 224 of the second reflecting member 220 may face the image plane 400S of the image sensor 400. The image side surface 224 of the second reflecting member 220 may have a convex shape. As an example, the object side surface 222 of the second reflecting member 220 may have a concave shape, and the image side surface 224 of the second reflecting member 220 may have a convex shape. The image side surface 224 of the second reflecting member 220 may include a reflective surface. The image side surface 224 of the second reflecting member 220 may be configured to reflect light incident from the object side surface 222 of the second reflecting member 220 to the first reflecting member 210. The second reflecting member 220 may be an aspheric lens, and an object side surface 222 and an image side surface 224 of the second reflecting member 220 may be aspheric. The second reflecting member 220 may be made of a plastic material, for example.
[0017] 2 and 4, the second reflecting member 220 may have a second hole 220H penetrating the center of the second reflecting member 220, and therefore may have a ring shape. The second lens 120 may be disposed to overlap the second hole 220H of the second reflecting member 220 along a direction parallel to the optical axis AX. The entire second lens 120 may overlap the second hole 220H along a direction parallel to the optical axis AX, and as an example, the second lens 120 may be disposed inside the second hole 220H.
[0018] 1 and 2 again, the third lens 130 may have negative refractive power. The third lens 130 may have an object side surface 132 and an image side surface 134 facing each other. The object side surface 132 of the third lens 130 may face an object (subject), and the image side surface 134 of the third lens 130 may face an image surface 400S of the image sensor 400. The image side surface 134 of the third lens 130 may have a concave shape. For example, the object side surface 132 of the third lens 130 may have a convex shape, and the image side surface 134 of the third lens 130 may have a concave shape. The third lens 130 may be an aspheric lens, and the object side surface 132 and the image side surface 134 of the third lens 130 may be aspheric. For example, the third lens 130 may be made of a plastic material.
[0019] The fourth lens 140 may have positive refractive power. The fourth lens 140 may have an object side surface 142 and an image side surface 144 facing each other. The object side surface 142 of the fourth lens 140 may face an object (subject), and the image side surface 144 of the fourth lens 140 may face an image surface 400S of the image sensor 400. The image side surface 144 of the fourth lens 140 may have a convex shape. For example, the object side surface 142 of the fourth lens 140 may have a concave shape, and the image side surface 144 of the fourth lens 140 may have a convex shape. The fourth lens 140 may be an aspheric lens, and the object side surface 142 and the image side surface 144 of the fourth lens 140 may be aspheric. For example, the fourth lens 140 may be made of a plastic material.
[0020] The fifth lens 150 may have negative refractive power. The fifth lens 150 may have an object side surface 152 and an image side surface 154 facing each other. The object side surface 152 of the fifth lens 150 may face an object (subject), and the image side surface 154 of the fifth lens 150 may face an image surface 400S of the image sensor 400. The image side surface 154 of the fifth lens 150 may have a convex shape. For example, the object side surface 152 of the fifth lens 150 may have a concave shape, and the image side surface 154 of the fifth lens 150 may have a convex shape. The fifth lens 150 may be an aspheric lens, and the object side surface 152 and the image side surface 154 of the fifth lens 150 may be aspheric. For example, the fifth lens 150 may be made of a plastic material.
[0021] The filter 300 may be disposed between the fifth lens 150 and an image plane 400S of the image sensor 400. The filter 300 may block some wavelengths of the incident light L incident through the first to fifth lenses 110, 120, 130, 140, and 150 and the first and second reflecting members 210 and 220. As an example, the filter 300 may be an infrared filter that blocks infrared wavelengths of the incident light L.
[0022] The image sensor 400 may include a plurality of pixels that convert incident light L incident through the first to fifth lenses 110, 120, 130, 140, and 150, the first and second reflecting members 210 and 220, and the filter 300 into an electrical signal.
[0023] The imaging lens system 1000 may be configured to increase the optical path of incident light L incident on the imaging lens system 1000 without increasing the overall length of the imaging lens system 1000. As an example, incident light L incident from the outside may be incident on the object side surface 222 of the second reflecting member 220 through the first lens 110, reflected by the image side surface 224 of the second reflecting member 220, and incident on the image side surface 214 of the first reflecting member 210. The incident light L may be reflected by the object side surface 212 of the first reflecting member 210 and incident on the second lens 120, and may be incident on the image plane 400S of the image sensor 400 through the third to fifth lenses 130, 140, and 150 and the filter 300.
[0024] 2 and 5, an effective diameter 112L of the object side surface 112 of the first lens 110 may be larger than an effective diameter 114L of the image side surface 114 of the first lens 110. In this specification, effective diameter means the diameter of a lens (or a reflecting member) through which actual light passes. The first lens 110 may have the largest effective diameter in the imaging lens system 1000. As an example, the effective diameter 112L of the object side surface 112 of the first lens 110 may be larger than the effective diameters of each of the second to fifth lenses 120, 130, 140, 150 and the first and second reflecting members 210, 220. The effective diameter 112L of the object side surface 112 of the first lens 110 may be 0.8 to 3 times the diagonal length IH of the image surface 400S of the image sensor 400 (i.e., 0.8IH≦112L≦3IH). For example, the effective diameter 112L of the object side surface 112 of the first lens 110 may be greater than 0.8 times the diagonal length IH of the image surface 400S and less than 3 times the diagonal length IH of the image surface 400S (i.e., 0.8IH<112L<3IH). The first lens 110 may act as an aperture in the imaging lens system 1000. The first lens 110 may have a size (for example, a diameter) larger than each of the second to fifth lenses 120, 130, 140, 150 and the first and second reflecting members 210, 220.
[0025] 2, 3, and 5, a diameter 110HL of a first hole 110H of a first lens 110 may be larger than a diameter 210L of a first reflecting member 210. Thus, the first reflecting member 210 may be disposed inside the first hole 110H. According to some embodiments, an effective diameter of an object side surface 212 of the first reflecting member 210 may be smaller than an effective diameter of an image side surface 214 of the first reflecting member 210.
[0026] 2, 4, and 5, the effective diameter of the object side surface 222 of the second reflecting member 220 may be smaller than the effective diameter of the image side surface 224 of the second reflecting member 220. The diameter 220HL of the second hole 220H of the second reflecting member 220 may be larger than the diameter 120L of the second lens 120. Therefore, the second lens 120 may be disposed inside the second hole 220H. The effective diameter of the object side surface 122 of the second lens 120 may be larger than the effective diameter of the image side surface 124 of the second lens 120.
[0027] 2 and 5, according to some embodiments, the effective diameter of the object-side surface 132 of the third lens 130 may be smaller than the effective diameter of the image-side surface 134 of the third lens 130. The effective diameter of the object-side surface 142 of the fourth lens 140 may be smaller than the effective diameter of the image-side surface 144 of the fourth lens 140, and the effective diameter of the object-side surface 152 of the fifth lens 150 may be smaller than the effective diameter of the image-side surface 154 of the fifth lens 150.
[0028] The imaging lens system 1000 can be configured to satisfy at least one of the following conditions 1 and 2: Condition 1)-10 <f1 / f2<-3 Condition 2)-30 <f5 / f<0 where f is the overall effective focal length of the imaging lens system 1000, f1 is the effective focal length of the first lens 110, f2 is the effective focal length of the second lens 120, and f5 is the effective focal length of the fifth lens 150.
[0029] The imaging lens system 1000 can be configured to satisfy lower condition 3). Condition 3)1 <f / TTL<3 Here, f is the total effective focal length of the imaging lens system 1000, and TTL is the distance from the object-side surface 112 of the first lens 110 to the image plane 400S of the image sensor 400, which is the distance on the optical axis AX.
[0030] The imaging lens system 1000 may be configured to implement autofocus by moving the first to fifth lenses 110, 120, 130, 140, 150 and the first to second reflecting members 210, 220 as a whole. As an example, the imaging lens system 1000 may implement autofocus by moving the first to fifth lenses 110, 120, 130, 140, 150 and the first to second reflecting members 210, 220 as a whole in a direction parallel to the optical axis AX.
[0031] Table 1 below shows exemplary dimensions of the imaging lens system 1000 according to some embodiments of the present invention. In Table 1, surface numbers are reference numbers indicating the object side and image side of each of the first to fifth lenses 110, 120, 130, 140, 150 and the first to second reflecting members 210, 220 shown in Fig. 2. In Table 1, 110HL is the diameter of the first hole 110H of the first lens 110 shown in Figs. 3 and 5, 220HL is the diameter of the second hole 220H of the second reflecting member 220 shown in Figs. 4 and 5, and IH is the diagonal length of the image surface 400S of the image sensor 400 shown in Fig. 5.
[0032] [Table 1] When the imaging lens system 1000 is configured as in Table 1, the total effective focal length f of the imaging lens system 1000 is 16.65 mm, the total length TTL of the imaging lens system 1000 is 7.8 mm, and the F No. is 2.4.
[0033] Fig. 6 is a configuration diagram of an imaging lens system according to some embodiments of the present invention, and is a side view cut along II' in Fig. 1. Fig. 7 is a front view showing the arrangement of the first lens 110 and the first reflecting member 210 in Fig. 6, and Fig. 8 is a front view showing the arrangement of the second and third lenses 120, 130 and the second reflecting member 220 in Fig. 6. Fig. 9 is a diagram for explaining dimensions of lenses and reflecting members constituting the imaging lens system of Fig. 6. For ease of explanation, explanations overlapping with those of the imaging lens system 1000 described with reference to Figs. 1 to 5 will be omitted.
[0034] 1 and 6, an imaging lens system 1100 may include a number of lenses 110 , 120 , 130 , 140 , and 150 , a number of reflecting members 210 and 220 , a filter 300 , and an image sensor 400 .
[0035] 6 and 7, the first lens 110 may have a first hole 110H penetrating the center of the first lens 110, and therefore may have a ring shape. The first reflecting member 210 may be disposed to overlap the first hole 110H of the first lens 110 along a direction parallel to the optical axis AX of the imaging lens system 1100. The entire first reflecting member 210 may overlap the first hole 110H along a direction parallel to the optical axis AX, and as an example, the first reflecting member 210 may be disposed inside the first hole 110H.
[0036] 6 and 8, the second reflecting member 220 may have a second hole 220H penetrating the center of the second reflecting member 220, and therefore may have a ring shape. According to some embodiments, the second lens 120 may be disposed between the first reflecting member 210 and the second reflecting member 220. The second lens 120 may be disposed to overlap the second hole 220H of the second reflecting member 220 along a direction parallel to the optical axis AX. The third lens 130 may be disposed to overlap the second hole 220H of the second reflecting member 220 along a direction parallel to the optical axis AX. The entire third lens 130 may overlap the second hole 220H along a direction parallel to the optical axis AX, and as an example, the third lens 130 may be disposed inside the second hole 220H.
[0037] 6 and 9, an effective diameter 112L of an object side surface 112 of the first lens 110 may be larger than an effective diameter 114L of an image side surface 114 of the first lens 110. The first lens 110 may have the largest effective diameter in the imaging lens system 1100. For example, the effective diameter 112L of the object side surface 112 of the first lens 110 may be larger than the effective diameters of each of the second to fifth lenses 120, 130, 140, 150 and the first and second reflecting members 210, 220. The effective diameter 112L of the object side surface 112 of the first lens 110 may be 0.8 to 3 times the diagonal length IH of the image surface 400S of the image sensor 400 (i.e., 0.8IH≦112L≦3IH). For example, the effective diameter 112L of the object side surface 112 of the first lens 110 may be greater than 0.8 times the diagonal length IH of the image surface 400S of the image sensor 400 and less than 3 times the diagonal length IH of the image surface 400S of the image sensor 400 (i.e., 0.8IH<112L<3IH). The first lens 110 may act as an aperture in the imaging lens system 1100. The first lens 110 may have a size (for example, a diameter) larger than each of the second to fifth lenses 120, 130, 140, 150 and the first and second reflecting members 210, 220.
[0038] 6, 7, and 9, a diameter 10HL of a first hole 110H of a first lens 110 may be greater than a diameter 210L of a first reflecting member 210. Thus, the first reflecting member 210 may be disposed inside the first hole 110H. According to some embodiments, an effective diameter of an object side surface 212 of the first reflecting member 210 may be greater than an effective diameter of an image side surface 214 of the first reflecting member 210.
[0039] 6, 8, and 9, the effective diameter of the object side surface 222 of the second reflecting member 220 may be smaller than the effective diameter of the image side surface 224 of the second reflecting member 220. According to some embodiments, the diameter 220HL of the second hole 220H of the second reflecting member 220 may be larger than the diameter 130L of the third lens 130. Thus, the third lens 130 may be disposed inside the second hole 220H. The effective diameter of the object side surface 122 of the second lens 120 may be larger than the effective diameter of the image side surface 124 of the second lens 120, and the effective diameter of the object side surface 132 of the third lens 130 may be larger than the effective diameter of the image side surface 134 of the third lens 130.
[0040] Referring again to Figures 6 and 9, the effective diameter of the object-side surface 142 of the fourth lens 140 may be smaller than the effective diameter of the image-side surface 144 of the fourth lens 140, and the effective diameter of the object-side surface 152 of the fifth lens 150 may be smaller than the effective diameter of the image-side surface 154 of the fifth lens 150.
[0041] Except for the differences described above, the imaging lens system 1100 according to this embodiment may be configured substantially similarly to the imaging lens system 1000 described with reference to FIGS.
[0042] Table 2 below shows exemplary dimensions of the imaging lens system 1100 according to some embodiments of the present invention. In Table 2, surface numbers are reference numbers indicating the object side and image side of each of the first to fifth lenses 110, 120, 130, 140, 150 and the first to second reflecting members 210, 220 shown in Fig. 6. In Table 2, 110HL is the diameter of the first hole 110H of the first lens 110 shown in Figs. 7 and 9, 220HL is the diameter of the second hole 220H of the second reflecting member 220 shown in Figs. 8 and 9, and IH is the diagonal length of the image surface 400S of the image sensor 400 shown in Fig. 9.
[0043] [Table 2] When the imaging lens system 1100 is configured as in Table 2, the total effective focal length f of the imaging lens system 1100 is 16.65 mm, the total length TTL of the imaging lens system 1100 is 8.07 mm, and the F No. is 2.1.
[0044] In accordance with the inventive concept, the imaging lens system 1000 / 1100 can be configured to increase the overall effective focal length f while decreasing the overall length TTL, such that the imaging lens system 1000 / 1100 can have a relatively small size and implement a high magnification.
[0045] FIG. 10 is a side cross-sectional view of an electronic device including an imaging lens system according to an embodiment of the present invention, and FIG. 11 is an enlarged view of a portion PP of FIG.
[0046] 10 and 11, an electronic device 2000 may include an imaging lens system 1000 / 1100 according to an embodiment of the present invention. The electronic device 2000 may be a small electronic device such as a smartphone. The imaging lens system 1000 / 1100 may be disposed inside the electronic device 2000. The electronic device 2000 may have a first surface S1 and a second surface S2 facing each other. The electronic device 2000 may have a length along a direction parallel to the first surface S1 and a thickness along a direction perpendicular to the first surface S1.
[0047] The imaging lens system 1000 / 1100 may include a lens group G including a plurality of lenses 110, 120, 130, 140, 150 and a plurality of reflecting members 210, 220, a filter 300, and an image sensor 400. The lens group G, the filter 300, and the image sensor 400 of the imaging lens system 1000 / 1100 may be sequentially arranged along a direction perpendicular to a first surface S1 of the electronic device 2000. As an example, the lens group G may be arranged adjacent to the first surface S1 of the electronic device 2000, and the image sensor 400 may be arranged adjacent to a second surface S2 of the electronic device 2000. The filter 300 may be arranged between the lens group G and the image sensor 400.
[0048] The lens group G may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150 arranged in sequence along a direction perpendicular to the first surface 500a from the first surface S1 toward the image sensor 400, and may include a first reflecting member 210 and a second reflecting member 220 arranged in sequence along a direction perpendicular to the first surface 500a from the first surface 500a toward the image sensor 400. The first to fifth lenses 110, 120, 130, 140, 150 and the first to second reflecting members 210, 220 may be configured similarly to the first to fifth lenses 110, 120, 130, 140, 150 and the first to second reflecting members 210, 220 described with reference to Figures 2 to 5, or may be configured similarly to the first to fifth lenses 110, 120, 130, 140, 150 and the first to second reflecting members 210, 220 described with reference to Figures 6 to 9.
[0049] Incident light L incident from the outside may be incident on the lens group G of the imaging lens system 1000 / 1100 through a first surface S1 of the electronic device 2000. The incident light L may be incident on the image sensor 400 through the lens group G and the filter 300.
[0050] The filter 300 may block some wavelengths of the incident light L incident through the first to fifth lenses 110, 120, 130, 140, and 150 and the first and second reflecting members 210 and 220. As an example, the filter 300 may be an infrared filter that blocks infrared wavelengths of the incident light L.
[0051] The image sensor 400 may include a plurality of pixels that convert the incident light L incident through the lens group G and the filter 300 into an electrical signal. As an example, the image sensor 400 may include a substrate 410 including a photoelectric conversion region PD and an element isolation pattern IS therebetween, a microlens array 430 disposed on an image surface 410a of the substrate 410, a color filter array 420 between the image surface 410a of the substrate 410 and the microlens array 430, and a wiring layer 440 disposed on the substrate 410b. Each of the plurality of pixels may include a corresponding one of the photoelectric conversion regions PD, a corresponding color filter of the color filter array 420, and a corresponding microlens of the microlens array 430. The structure of the image sensor 400 is not limited to the above disclosure.
[0052] The imaging lens system 1000 / 1100 may be configured to implement autofocus by moving the entire lens group G in a direction perpendicular to the first surface S1. The imaging lens system 1000 / 1100 may be configured to increase the overall effective focal length f while decreasing the overall length TTL.
[0053] The thickness of the electronic device 2000 (i.e., the thickness along a direction perpendicular to the first surface S1) may be smaller than the length of the electronic device 2000 (i.e., the length along a direction parallel to the first surface S1). The imaging lens system 1000 / 1100 may have a relatively reduced overall length TTL, and as an example, the imaging lens system 1000 / 1100 may have an overall length TTL of less than about 10 mm. Therefore, the imaging lens system 1000 / 1100 may be easily implemented inside the electronic device 2000 in the thickness direction of the electronic device 2000 (i.e., the direction perpendicular to the first surface S1). The electronic device 2000 may be a smartphone, as an example.
[0054] According to the concept of the present invention, the imaging lens system 1000 / 1100 can be configured to increase the overall effective focal length f while decreasing the overall length TTL. Thus, the imaging lens system 1000 / 1100 can have a relatively small size and realize a high magnification. Thus, an imaging lens system that has a relatively small size and can realize a high magnification and an electronic device including the same can be provided.
[0055] The above description of the embodiments of the present invention provides examples for explaining the present invention. Therefore, the present invention is not limited to the above embodiments, and it is apparent that various modifications and changes can be made by those skilled in the art within the technical concept of the present invention, such as by combining the above embodiments. [Explanation of symbols]
[0056] 110, 120, 130, 140, 150 first to fifth lenses 210, 220 1 and second reflecting member 300 Filters 400 Image Sensor 112, 122, 132, 142, 152, 212, 222 Object side 114, 124, 134, 144, 154, 214, 224 Image side Image plane of 400S image sensor
Claims
1. An image sensor; a first lens on the image sensor; a first reflecting member disposed adjacent to the first lens; a second reflecting member disposed between the first reflecting member and the image sensor; a second lens disposed between the first reflecting member and the image sensor; 1. An imaging lens system comprising: the object-side surface of the first reflecting member and the image-side surface of the second reflecting member include a reflecting surface; The first lens, the first reflecting member, and the second reflecting member are configured to satisfy the following conditional expressions: 1<f / TTL<3 where f is the total effective focal length of the imaging lens system, TTL is the distance from the object-side surface of the first lens to the image plane of the image sensor, An imaging lens system, wherein the second reflecting member has a second hole passing through a central portion of the second reflecting member, and at least a portion of the second lens is contained within the second hole.
2. An imaging lens system as described in claim 1, wherein the effective diameter of the object side of the first lens is larger than the effective diameter of the image side of the first lens.
3. An imaging lens system as described in claim 1, wherein at least one of the first reflecting member and the second reflecting member is an aspheric lens.
4. An imaging lens system as described in claim 3, wherein the first lens is a spherical lens or an aspherical lens.
5. An imaging lens system as described in claim 1, wherein the image side surface of the first lens has a concave shape.
6. An imaging lens system as described in claim 1, wherein the object side surface of the first reflecting member has a concave shape.
7. An imaging lens system as described in claim 1, wherein the image side surface of the second reflecting member has a convex shape.
8. An imaging lens system as described in claim 1, wherein the effective diameter of the object side of the first lens is 0.8 to 3 times the diagonal length of the image plane of the image sensor.
9. The first lens has a first hole penetrating a central portion of the first lens, The imaging lens system of claim 1 , wherein the first reflecting member is disposed so as to overlap the first hole in a direction parallel to an optical axis of the imaging lens system.
10. An imaging lens system as described in claim 1, wherein the distance from the object side of the first lens to the image plane of the image sensor is less than 10 mm and greater than 0.
11. A first lens having a positive refractive power, the image surface of the first lens having a concave shape; a first reflecting member disposed adjacent to the first lens, the image surface of the first reflecting member having a concave shape; a second lens having negative refractive power, the image surface of the second lens having a concave shape; a third lens disposed adjacent to the image plane of the second lens; a second reflecting member disposed adjacent to the second lens or the third lens, the image surface of the second reflecting member having a convex shape; An image sensor and 1. An imaging lens system comprising: the first lens, the second lens, and the third lens are arranged in this order from the object side toward the image sensor, the object-side surface of the first reflecting member and the image-side surface of the second reflecting member include a reflecting surface; An imaging lens system, wherein the second reflecting member has a second hole passing through a central portion of the second reflecting member, and at least a portion of the second lens or at least a portion of the third lens is contained within the second hole.
12. An imaging lens system as described in claim 11, wherein the third lens has negative refractive power and the image side surface of the third lens has a concave shape.
13. The optical system further includes a fourth lens and a fifth lens arranged in sequence between the third lens and the image sensor, 13. The imaging lens system of claim 12, wherein the fourth lens has positive refractive power and an image-side surface of the fourth lens has a convex shape.
14. An imaging lens system as described in claim 13, wherein the fifth lens has negative refractive power and the image side surface of the fifth lens has a convex shape.
15. A first lens having a concave image-side surface; a first reflecting member disposed adjacent to the first lens, the object side surface of the first reflecting member having a concave shape; a second lens having a concave image-side surface; a third lens having a concave image-side surface; a second reflecting member disposed adjacent to the second lens or the third lens, the image side surface of the second reflecting member having a convex shape; An image sensor and 1. An imaging lens system comprising: the first lens, the second lens, and the third lens are arranged in this order from the object side toward the image sensor, the object-side surface of the first reflecting member and the image-side surface of the second reflecting member include a reflecting surface; An imaging lens system, wherein the second reflecting member has a second hole passing through a central portion of the second reflecting member, and at least a portion of the second lens or at least a portion of the third lens is contained within the second hole.
16. The first lens has a first hole penetrating a central portion of the first lens, The imaging lens system of claim 15 , wherein the first reflecting member is disposed so as to overlap with the first hole in a direction parallel to an optical axis of the imaging lens system.
17. An imaging lens system as described in Claim 15, wherein the second lens or the third lens is arranged so as to overlap with the second hole in a direction parallel to the optical axis of the imaging lens system.
18. The optical system further includes a fourth lens and a fifth lens arranged in sequence between the third lens and the image sensor, 16. The imaging lens system of claim 15, wherein the image-side surface of the fourth lens has a convex shape and the image-side surface of the fifth lens has a convex shape.
19. The imaging lens system of claim 18, further comprising an infrared filter disposed between the fifth lens and the image sensor.
20. An imaging lens system as described in claim 15, wherein the distance from the object side of the first lens to the image plane of the image sensor is less than 10 mm and greater than 0.