Miniaturized high-resolution optical system

Abstract

The present invention discloses a miniaturized high-resolution optical system, comprising a lens comprising a first lens group with positive optical power, an effective aperture, a color filter with partial wavelength interception, a second lens group with positive optical power, and an imaging surface, arranged sequentially from the object side. The first lens group comprises a first negative lens, a second positive lens, a third positive lens, and a fourth negative lens, arranged sequentially from the object side. The first negative lens and the second positive lens form a cemented lens, or the third positive lens and the fourth negative lens form a cemented lens. The second lens group comprises a plurality of lenses arranged sequentially, wherein at least two negative lenses are provided among the plurality of lenses, and the lenses in the second lens group form at least one cemented lens group with positive optical power. Through a simple lens structure, spherical aberration, astigmatism, and chromatic aberration are well controlled, thereby achieving high resolution.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging optical systems, and in particular to a miniaturized high-resolution optical system. Background Art

[0002] Today's drone cameras are demanding increasingly higher image resolution, requiring lenses that can better compensate for aberration to achieve excellent resolution. At the same time, existing drones still suffer from issues like large and heavy lenses, which in turn reduces their flight time. Summary of the Invention

[0003] The object of the present invention is to provide a miniaturized high-resolution optical system to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The technical solutions adopted to solve the above technical problems are:

[0005] The present invention provides a miniaturized high-resolution optical system, comprising a lens:

[0006] The lens comprises a first lens group with positive optical power, an effective aperture, a color filter with partial wavelength interception, a second lens group with positive optical power, and an imaging surface, which are arranged in sequence from the object side;

[0007] The first lens group includes a first negative lens, a second positive lens, a third positive lens, and a fourth negative lens, which are arranged in sequence from the object side. The first negative lens and the second positive lens form a cemented lens, or the third positive lens and the fourth negative lens form a cemented lens.

[0008] The second lens group includes a plurality of lenses arranged in sequence, wherein at least two negative lenses are arranged in the plurality of lenses, and the lenses in the second lens group form at least one cemented lens group with positive optical power.

[0009] The beneficial effects of the present invention are:

[0010] Through a simple lens structure, spherical aberration, astigmatism, and chromatic aberration are effectively controlled, achieving high resolution and a wide-angle field of view. Optical distortion is minimal, eliminating the need for extensive post-processing in actual lens applications. Furthermore, by optimizing the optical power of the various lens groups, a compact design and high resolution are achieved.

[0011] As a further improvement to the above technical solution, the effective aperture is fixed or movable relative to the imaging plane. To limit the light beam or the field of view (imaging range), an effective aperture is provided to optimize and shape the light beam, thereby improving beam quality. The effective aperture is set according to the actual needs of the lens.

[0012] As a further improvement of the above technical solution, the lens closest to the imaging surface in the second lens group is a negative lens, which plays a converging role to achieve a compact optical structure.

[0013] As a further improvement of the above technical solution, the plurality of lenses include a fifth negative lens, a sixth positive lens, a seventh positive lens, and an eighth negative lens, which are arranged in sequence from the object side.

[0014] As a further improvement of the above technical solution, the lens satisfies the following conditional formula:

[0015] (1) 0.79<f1 / f2<1.16;

[0016] (2) (f1+f2) / EFL<3.6;

[0017] in:

[0018] f1: The composite focal length of the first lens group in the above lens;

[0019] f2: The combined focal length of the second lens group in the above lens;

[0020] EFL: The focal length of the above lens when focused at infinity.

[0021] As a further improvement of the above technical solution, the lens satisfies the following conditional formula:

[0022] (3) 0.49<f3 / f4;

[0023] (4) 0.24<TL12 / TLA;

[0024] f3: the focal length of the first element in the above lens;

[0025] f4: The focal length of the lens closest to the imaging plane in the above lens;

[0026] TL12: The distance between the first and second lens groups on the optical axis of the above lens;

[0027] TLA: The distance on the optical axis from the lens surface closest to the object side to the lens surface closest to the imaging surface in the above lens.

[0028] As a further improvement of the above technical solution, the lens satisfies the following conditional formula:

[0029] (5)0.89<nd1 / nd2<0.99;

[0030] in:

[0031] nd1: the average refractive index of all negative elements in the above lens;

[0032] nd2: the average refractive index of all positive elements in the above lens;

[0033] Improve compactness and reduce dispersion. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0035] Figure 1 This is a structural diagram of a first embodiment of a miniaturized high-resolution optical system provided by the present invention;

[0036] Figure 2 This is a structural diagram of a second embodiment of a miniaturized high-resolution optical system provided by the present invention;

[0037] Figure 3 It shows Figure 1 A diagram of longitudinal aberrations of a specific example of an embodiment of the present invention;

[0038] Figure 4 It shows Figure 2 Graphs of longitudinal aberrations of specific examples of embodiments. DETAILED DESCRIPTION

[0039] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0041] In the description of the present invention, if there are words such as "several", it means one or more, and "more" means more than two. Greater than, less than, and exceed are understood as not including the number itself, and above, below, and within are understood as including the number itself.

[0042] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0043] Reference Figures 1 to 4 The miniaturized high-resolution optical system of the present invention is implemented as follows:

[0044] In Example 1 and Example 2, the lens comprises a first lens group G1 with positive optical power, an effective aperture St, a color filter LT with partial wavelength interception, a second lens group G2 with positive optical power, and an imaging surface IMG, which are arranged in order from the object side;

[0045] The first lens group G1 includes a first negative lens L1, a second positive lens L2, a third positive lens L3, and a fourth negative lens L4, which are arranged in order from the object side. The first negative lens L1 and the second positive lens L2 form a cemented lens, or the third positive lens L3 and the fourth negative lens L4 form a cemented lens.

[0046] The second lens group G2 includes a plurality of lenses arranged in sequence, including at least two negative lenses. The lenses in the second lens group G2 form at least one positive-power cemented lens group. The plurality of lenses include a fifth negative lens L5, a sixth positive lens L6, a seventh positive lens L7, and an eighth negative lens L8, arranged sequentially from the object side. The cemented lenses correct chromatic aberration and effectively balance the coma, astigmatism, and chromatic aberration of the first and second lens groups G1 and G2, significantly reducing the sensitivity of the front and rear lens groups to tolerances. Multiple cemented lens combinations can also be used to further improve chromatic aberration. The presence of multiple negative lenses allows for a wider angle of view and increases the light throughput and resolution at the lens periphery. The mirror surface of the first negative lens L1 is curved toward the object side, forming a crescent shape, which minimizes overall coma and astigmatism, reducing the sensitivity of the first and second lens groups G1 and G2 to tolerances.

[0047] Furthermore, the effective aperture St is fixed or movable relative to the imaging plane IMG. In order to limit the light beam or the size of the field of view (imaging range), an effective aperture St is provided to optimize the light beam shaping and improve the beam quality. The effective aperture St is set according to the actual needs of the lens.

[0048] Furthermore, the lens closest to the imaging surface IMG in the second lens group G2 is a negative lens, which plays a converging role to achieve a compact optical structure.

[0049] Through a simple lens structure, spherical aberration, astigmatism, and chromatic aberration are effectively controlled, achieving high resolution and a wide-angle field of view. Optical distortion is minimal, eliminating the need for extensive post-processing in actual lens applications. Furthermore, by optimizing the optical power of the various lens groups, a compact design and high resolution are achieved.

[0050] Furthermore, the lenses all satisfy the following conditional formula:

[0051] (1) 0.79<f1 / f2<1.16;

[0052] (2) (f1+f2) / EFL<3.6;

[0053] (3) 0.49<f3 / f4;

[0054] (4) 0.24<TL12 / TLA;

[0055] (5) 0.89<nd1 / nd2<0.99, improving the compactness of the structure and reducing dispersion;

[0056] in:

[0057] f1: The combined focal length of the first lens group G1 in the above lens;

[0058] f2: The combined focal length of the second lens group G2 in the above lens;

[0059] EFL: focal length of the above lenses when focused at infinity;

[0060] f3: the focal length of the first element in the above lens;

[0061] f4: The focal length of the lens closest to the imaging plane in the above lens;

[0062] TL12: The distance between the first lens group G1 and the second lens group G2 on the optical axis of the lens;

[0063] TLA: The distance on the optical axis from the lens surface closest to the object side to the lens surface closest to the image plane IMG in the above lens;

[0064] nd1: the average refractive index of all negative elements in the above lens;

[0065] nd2: The average refractive index of all positive elements in the above lens.

[0066] The specific scheme of Example 1 is:

[0067]

[0068] Figure 3Shown in the Figure 1 Aberration diagrams of a miniaturized high-resolution fixed-focus optical system according to an embodiment of the present invention are shown. As can be clearly seen from these aberration diagrams, Figure 1 The aberrations of the miniaturized high-resolution optical system of the embodiment shown are all well corrected, and the performance is good. The separation distance refers to the distance between the two surfaces on the principal optical axis.

[0069] The specific scheme of Example 2 is:

[0070]

[0071] Figure 4 Shown in the Figure 2 Aberration diagrams of a miniaturized high-resolution fixed-focus optical system according to an embodiment of the present invention are shown. As can be clearly seen from these aberration diagrams, Figure 2 The aberrations of the miniaturized high-resolution optical system of the embodiment shown are all well corrected, and the performance is good. The separation distance refers to the distance between the two surfaces on the principal optical axis.

[0072] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A miniaturized high-resolution optical system, characterized in that: The miniaturized high-resolution optical system includes a lens: The lens comprises a first lens group (G1) with positive optical power, an effective aperture (St), a color filter (LT) with partial wavelength interception, a second lens group (G2) with positive optical power, and an imaging surface (IMG) arranged in sequence from the object side; The first lens group (G1) is composed of a first negative lens (L1), a second positive lens (L2), a third positive lens (L3), and a fourth negative lens (L4) arranged in sequence from the object side, the first negative lens (L1) and the second positive lens (L2) forming a cemented lens, or the third positive lens (L3) and the fourth negative lens (L4) forming a cemented lens; The second lens group (G2) is composed of four lenses, which are a fifth negative lens (L5), a sixth positive lens (L6), a seventh positive lens (L7), and an eighth negative lens (L8) arranged in sequence from the object side, at least two negative lenses are provided in the four lenses, and the lenses in the second lens group (G2) form at least one cemented lens group with positive optical power; The lens satisfies the following conditional formula: (1) 0.79<f1 / f2<1.16; (2) (f1+f2) / EFL<3.6; in: f1: The combined focal length of the first lens group (G1) in the above lens; f2: The combined focal length of the second lens group (G2) in the above lens; EFL: The focal length of the above lens when focused at infinity.

2. The miniaturized high-resolution optical system according to claim 1, wherein: The effective aperture (St) is fixed or movable relative to the imaging surface (IMG).

3. The miniaturized high-resolution optical system according to claim 1, wherein: The lens closest to the imaging surface (IMG) in the second lens group (G2) is a negative lens.

4. The miniaturized high-resolution optical system according to claim 1, wherein: The lens satisfies the following conditional formula: (3) 0.49<f3 / f4; (4) 0.24<TL12 / TLA; f3: the focal length of the first element in the above lens; f4: The focal length of the lens closest to the imaging plane in the above lens; TL12: The distance between the first lens group (G1) and the second lens group (G2) on the optical axis in the above lens; TLA: The distance on the optical axis from the lens surface closest to the object side to the lens surface closest to the image plane (IMG) in the above lenses.

5. The miniaturized high-resolution optical system according to claim 4, wherein: The lens satisfies the following conditional formula: (5)0.89<nd1 / nd2<0.99; in: nd1: the average refractive index of all negative elements in the above lens; nd2: The average refractive index of all positive elements in the above lens.

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