Vehicle front view optical system and camera module applied thereto

Abstract

An embodiment of the present invention discloses a vehicle-mounted front-view optical system, which sequentially includes, along the optical axis from the object surface to the image surface: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; the object surface side of the first lens is convex, the image surface side is concave, and its optical power is negative; the second lens is a double-concave lens, and its optical power is negative; both the third lens and the fifth lens are double-convex lenses, and their optical powers are positive; the object surface sides of the fourth lens and the seventh lens are both convex, and their optical powers are positive; the object surface side of the sixth lens is concave, and its optical power is negative. On the other hand, an embodiment of the present invention also provides an imaging module. The optical system or the imaging module of the embodiment of the present invention is mainly composed of 7 lenses, with a small number of lenses, a simple structure, a low cost, and a moderate overall shape of the optical system or the imaging module; at the same time, it has optical properties such as a large aperture, a high pixel count, a large aperture, and good thermal aberration correction, and is suitable for the field of vehicle-mounted lenses.

Description

Technical Field:

[0001] The present invention relates to an optical system and an imaging module using the same, and particularly to a vehicle front view optical system applied to the vehicle field and an imaging module using the same. Background Art:

[0002] With the application and popularization of automotive safety driving systems, optical systems or modules in the vehicle field have also been widely used. There is an increasing demand for application lenses for applications such as forward vehicle collision warning, lane departure warning, and pedestrian recognition warning. Such optical systems or modules are required to be able to clearly image in both daytime and low illuminance environments, so large apertures need to be considered for the lenses; at the same time, in order to meet the detailed identification of a wide field of view, the optical system or module needs to have a larger field of view angle and higher resolution pixels. However, existing optical systems or modules applied to the vehicle field generally have defects such as too many lenses, complex structures, too small apertures, or too low pixels, and it is difficult to meet the market demand. Summary of the Invention:

[0003] In order to overcome the problems of too many lenses and complex structures commonly existing in existing optical systems or modules applied to the vehicle field, an aspect of an embodiment of the present invention provides a vehicle front view optical system.

[0004] A vehicle front view optical system sequentially includes, along the optical axis from the object plane to the image plane: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens;

[0005] The object plane side of the first lens is convex, and the image plane side is concave, and its optical power is negative;

[0006] The object plane side of the second lens is concave, and the image plane side is concave, and its optical power is negative;

[0007] The object plane side of the third lens is convex, and the image plane side is convex, and its optical power is positive;

[0008] The object plane side of the fourth lens is convex, and its optical power is positive;

[0009] The object plane side of the fifth lens is convex, and the image plane side is convex, and its optical power is positive;

[0010] The object plane side of the sixth lens is concave, and its optical power is negative;

[0011] The object plane side of the seventh lens is convex, and its optical power is positive.

[0012] On the other hand, an embodiment of the present invention also provides an imaging module.

[0013] An imaging module includes at least an optical lens, and the above-mentioned vehicle front view optical system is installed in the optical lens.

[0014] The optical system or camera module according to the embodiment of the present invention mainly consists of seven lenses. It has fewer lens elements, a simple structure, a relatively low cost, and a moderate overall shape. At the same time, through the mutual combination of different lenses and the reasonable distribution of optical power, it has optical properties such as a large aperture, high pixels, a large aperture, and good correction of thermal aberration, and is suitable for the field of vehicle-mounted lenses. Description of the Drawings:

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 Structural schematic of the embodiment of the optical system or camera module of the present invention Figure 1 ;

[0017] Figure 2 Distortion curve graph of the embodiment of the optical system or camera module of the present invention at +25°C;

[0018] Figure 3 MTF curve graph of the embodiment of the optical system or camera module of the present invention at +25°C;

[0019] Figure 4 Relative illuminance graph of the embodiment of the optical system or camera module of the present invention at +25°C;

[0020] Figure 5 MTF curve graph of the embodiment of the optical system or camera module of the present invention at -40°C;

[0021] Figure 6 MTF curve graph of the embodiment of the optical system or camera module of the present invention at +85°C;

[0022] Figure 7 Structural schematic of the embodiment of the optical system or camera module of the present invention Figure 2 ;

[0023] Figure 8 Structural schematic of the embodiment of the optical system or camera module of the present invention Figure 3 ;

[0024] Figure 9 Structural schematic of the embodiment of the optical system or camera module of the present invention Figure 4 ;

[0025] Figure 10Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 5 ;

[0026] Figure 11 Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 6 ;

[0027] Figure 12 Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 7 ;

[0028] Figure 13 Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 8 ;

[0029] Figure 14 Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 9 ;

[0030] Figure 15 Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 10 ;

[0031] Figure 16 Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 10 One;

[0032] Figure 17 Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 10 Two;

[0033] Figure 18 Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 10 Three;

[0034] Figure 19 Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 10 Four;

[0035] Figure 20 Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 10 Five;

[0036] Figure 21 Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 10 Six;

[0037] Figure 22 Schematic structure of an embodiment of the optical system or camera module of the present invention Figure 10 Seven;

[0038] Figure 23Structural schematic of an optical system or camera module embodiment of the present invention Figure 10 Eight; Specific implementation manner:

[0039] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] When ordinal numbers such as "first" and "second" are mentioned in the embodiments of the present invention, unless they actually express an order meaning according to the context, they should be understood as only for distinction.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] A vehicle front view optical system sequentially includes, along the optical axis from the object plane to the image plane: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7.

[0043] The object plane side of the first lens 1 is convex, and the image plane side is concave, and its optical power is negative;

[0044] The object plane side of the second lens 2 is concave, and the image plane side is concave, and its optical power is negative;

[0045] The object plane side of the third lens 3 is convex, and the image plane side is convex, and its optical power is positive;

[0046] The object plane side of the fourth lens 4 is convex, and its optical power is positive;

[0047] The object plane side of the fifth lens 5 is convex, and the image plane side is convex, and its optical power is positive;

[0048] The object plane side of the sixth lens 6 is concave, and its optical power is negative;

[0049] The object plane side of the seventh lens 7 is convex, and its optical power is positive.

[0050] The optical system according to the embodiments of the present invention mainly consists of seven lenses. With fewer lenses, it has a simple structure, lower cost, and a moderate overall shape for the optical system or the camera module. At the same time, through the mutual combination of different lenses and the reasonable distribution of optical power, it has optical properties such as a large aperture, high pixels, a large aperture, and good achromatism, and is suitable for the field of vehicle-mounted lenses.

[0051] Further, as a preferred embodiment of the present invention rather than a limitation, as Figure 1 shown,

[0052] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0053] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0054] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0055] The object side of the fourth lens 4 is convex, and the image side is flat, and its optical power is positive;

[0056] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0057] The object side of the sixth lens 6 is concave, and the image side is convex, and its optical power is negative;

[0058] The object side of the seventh lens 7 is convex, and the image side is convex, and its optical power is positive.

[0059] Still further, as another preferred embodiment of the present invention rather than a limitation, as Figure 7 shown,

[0060] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0061] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0062] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0063] The object side of the fourth lens 4 is convex, and the image side is flat, and its optical power is positive;

[0064] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0065] The object side of the sixth lens 6 is concave, and the image side is convex, and its optical power is negative;

[0066] The object side of the seventh lens 7 is convex, and the image side is concave, and its optical power is positive.

[0067] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 8 shown,

[0068] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0069] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0070] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0071] The object side of the fourth lens 4 is convex, and the image side is flat, and its optical power is positive;

[0072] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0073] The object side of the sixth lens 6 is concave, and the image side is flat, and its optical power is negative;

[0074] The object side of the seventh lens 7 is convex, and the image side is convex, and its optical power is positive.

[0075] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 9 shown,

[0076] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0077] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0078] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0079] The object side of the fourth lens 4 is convex, and the image side is flat, and its optical power is positive;

[0080] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0081] The object side of the sixth lens 6 is concave, and the image side is flat, and its optical power is negative;

[0082] The object side of the seventh lens 7 is convex, and the image side is concave, and its optical power is positive.

[0083] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 10 shown,

[0084] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0085] The object surface side of the second lens 2 is concave, and the image surface side is concave, and its optical power is negative;

[0086] The object surface side of the third lens 3 is convex, and the image surface side is convex, and its optical power is positive;

[0087] The object surface side of the fourth lens 4 is convex, and the image surface side is flat, and its optical power is positive;

[0088] The object surface side of the fifth lens 5 is convex, and the image surface side is convex, and its optical power is positive;

[0089] The object surface side of the sixth lens 6 is concave, and the image surface side is concave, and its optical power is negative;

[0090] The object surface side of the seventh lens 7 is convex, and the image surface side is convex, and its optical power is positive.

[0091] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 11 shown,

[0092] The object surface side of the first lens 1 is convex, and the image surface side is concave, and its optical power is negative;

[0093] The object surface side of the second lens 2 is concave, and the image surface side is concave, and its optical power is negative;

[0094] The object surface side of the third lens 3 is convex, and the image surface side is convex, and its optical power is positive;

[0095] The object surface side of the fourth lens 4 is convex, and the image surface side is flat, and its optical power is positive;

[0096] The object surface side of the fifth lens 5 is convex, and the image surface side is convex, and its optical power is positive;

[0097] The object surface side of the sixth lens 6 is concave, and the image surface side is concave, and its optical power is negative;

[0098] The object surface side of the seventh lens 7 is convex, and the image surface side is concave, and its optical power is positive.

[0099] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 12 shown,

[0100] The object surface side of the first lens 1 is convex, and the image surface side is concave, and its optical power is negative;

[0101] The object surface side of the second lens 2 is concave, and the image surface side is concave, and its optical power is negative;

[0102] The object surface side of the third lens 3 is convex, and the image surface side is convex, and its optical power is positive;

[0103] The object side of the fourth lens 4 is convex, and the image side is convex, and its optical power is positive;

[0104] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0105] The object side of the sixth lens 6 is concave, and the image side is convex, and its optical power is negative;

[0106] The object side of the seventh lens 7 is convex, and the image side is convex, and its optical power is positive.

[0107] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 13 shown,

[0108] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0109] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0110] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0111] The object side of the fourth lens 4 is convex, and the image side is convex, and its optical power is positive;

[0112] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0113] The object side of the sixth lens 6 is concave, and the image side is convex, and its optical power is negative;

[0114] The object side of the seventh lens 7 is convex, and the image side is concave, and its optical power is positive.

[0115] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 14 shown,

[0116] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0117] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0118] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0119] The object side of the fourth lens 4 is convex, and the image side is convex, and its optical power is positive;

[0120] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0121] The object side of the sixth lens 6 is concave, and the image side is flat, and its optical power is negative;

[0122] The object side of the seventh lens 7 is convex, and the image side is convex, and its optical power is positive.

[0123] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 15 shown,

[0124] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0125] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0126] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0127] The object side of the fourth lens 4 is convex, and the image side is convex, and its optical power is positive;

[0128] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0129] The object side of the sixth lens 6 is concave, and the image side is flat, and its optical power is negative;

[0130] The object side of the seventh lens 7 is convex, and the image side is concave, and its optical power is positive.

[0131] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 16 shown,

[0132] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0133] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0134] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0135] The object side of the fourth lens 4 is convex, and the image side is convex, and its optical power is positive;

[0136] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0137] The object side of the sixth lens 6 is concave, and the image side is concave, and its optical power is negative;

[0138] The object side of the seventh lens 7 is convex, and the image side is convex, and its optical power is positive.

[0139] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 17 shown,

[0140] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0141] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0142] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0143] The object side of the fourth lens 4 is convex, and the image side is convex, and its optical power is positive;

[0144] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0145] The object side of the sixth lens 6 is concave, and the image side is concave, and its optical power is negative;

[0146] The object side of the seventh lens 7 is convex, and the image side is concave, and its optical power is positive.

[0147] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 18 shown,

[0148] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0149] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0150] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0151] The object side of the fourth lens 4 is convex, and the image side is concave, and its optical power is positive;

[0152] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0153] The object side of the sixth lens 6 is concave, and the image side is convex, and its optical power is negative;

[0154] The object side of the seventh lens 7 is convex, and the image side is convex, and its optical power is positive.

[0155] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 19 shown,

[0156] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0157] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0158] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0159] The object side of the fourth lens 4 is convex, and the image side is concave, and its optical power is positive;

[0160] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0161] The object side of the sixth lens 6 is concave, and the image side is convex, and its optical power is negative;

[0162] The object side of the seventh lens 7 is convex, and the image side is concave, and its optical power is positive.

[0163] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 20 shown,

[0164] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0165] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0166] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0167] The object side of the fourth lens 4 is convex, and the image side is concave, and its optical power is positive;

[0168] The object side of the fifth lens 5 is convex, and the image side is convex, and its optical power is positive;

[0169] The object side of the sixth lens 6 is concave, and the image side is flat, and its optical power is negative;

[0170] The object side of the seventh lens 7 is convex, and the image side is convex, and its optical power is positive.

[0171] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 21 shown,

[0172] The object side of the first lens 1 is convex, and the image side is concave, and its optical power is negative;

[0173] The object side of the second lens 2 is concave, and the image side is concave, and its optical power is negative;

[0174] The object side of the third lens 3 is convex, and the image side is convex, and its optical power is positive;

[0175] The object side of the fourth lens 4 is convex and the image side is concave, and its optical power is positive;

[0176] The object side of the fifth lens 5 is convex and the image side is convex, and its optical power is positive;

[0177] The object side of the sixth lens 6 is concave and the image side is flat, and its optical power is negative;

[0178] The object side of the seventh lens 7 is convex and the image side is concave, and its optical power is positive.

[0179] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 22 shown,

[0180] The object side of the first lens 1 is convex and the image side is concave, and its optical power is negative;

[0181] The object side of the second lens 2 is concave and the image side is concave, and its optical power is negative;

[0182] The object side of the third lens 3 is convex and the image side is convex, and its optical power is positive;

[0183] The object side of the fourth lens 4 is convex and the image side is concave, and its optical power is positive;

[0184] The object side of the fifth lens 5 is convex and the image side is convex, and its optical power is positive;

[0185] The object side of the sixth lens 6 is concave and the image side is concave, and its optical power is negative;

[0186] The object side of the seventh lens 7 is convex and the image side is convex, and its optical power is positive.

[0187] Furthermore, as another preferred embodiment of the present invention rather than a limitation, as Figure 23 shown,

[0188] The object side of the first lens 1 is convex and the image side is concave, and its optical power is negative;

[0189] The object side of the second lens 2 is concave and the image side is concave, and its optical power is negative;

[0190] The object side of the third lens 3 is convex and the image side is convex, and its optical power is positive;

[0191] The object side of the fourth lens 4 is convex and the image side is concave, and its optical power is positive;

[0192] The object side of the fifth lens 5 is convex and the image side is convex, and its optical power is positive;

[0193] The object side of the sixth lens 6 is concave, and the image side is concave, and its optical power is negative;

[0194] The object side of the seventh lens 7 is convex, and the image side is concave, and its optical power is positive.

[0195] Furthermore, as a preferred embodiment of the present invention rather than a limitation, the optical system satisfies TTL / EFL ≤ 6.7, where TTL is the distance between the vertex on the object side of the first lens 1 of the optical system and the imaging surface 9, and EFL is the effective focal length of the optical system. It has a simple and compact structure, and by combining different lenses, it has optical properties such as large aperture, high pixel, large aperture, and good thermal aberration correction.

[0196] Still further, as a preferred embodiment of the present invention rather than a limitation, the second lens 2 and the third lens 3 are mutually cemented to form a combined lens. It has a simple and compact structure and good optical properties.

[0197] Even further, as a preferred embodiment of the present invention rather than a limitation, the fifth lens 5 and the sixth lens 6 are mutually cemented to form a combined lens. It has a simple and compact structure and good optical properties.

[0198] Still further, as a preferred embodiment of the present invention rather than a limitation, each lens of the optical system satisfies the following conditions:

[0199] (1) -20 < f1 < -2;

[0200] (2) -15 < f2 < -1.5;

[0201] (3) 2 < f3 < 20;

[0202] (4) 5 < f4 < 50;

[0203] (5) 2 < f5 < 20;

[0204] (6) -20 < f6 < -2;

[0205] (7) 5 < f7 < 50;

[0206] Wherein, f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, f4 is the focal length of the fourth lens 4, f5 is the focal length of the fifth lens 5, f6 is the focal length of the sixth lens 6, and f7 is the focal length of the seventh lens 7. By combining different lenses, it has optical properties such as large aperture, high pixel, large aperture, and good thermal aberration correction.

[0207] Even further, as a preferred embodiment of the present invention rather than a limitation, each lens of the optical system satisfies the following conditions:

[0208] (1) -5 < f1 / f < -0.2;

[0209] (2) -5 < f2 / f < -0.2;

[0210] (3) 0.2 < f3 / f < 5;

[0211] (4) 0.8 < f4 / f < 10;

[0212] (5) 0.2 < f5 / f < 5;

[0213] (6) -5 < f6 / f < -0.2;

[0214] (7) 0.8 < f7 / f < 10;

[0215] Wherein, f is the focal length of the entire optical system, f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, f4 is the focal length of the fourth lens 4, f5 is the focal length of the fifth lens 5, f6 is the focal length of the sixth lens 6, and f7 is the focal length of the seventh lens 7. By combining different lenses, it has optical properties such as large aperture, high pixel, large aperture, and good thermal aberration correction.

[0216] Furthermore, as a preferred embodiment of the present invention rather than a limitation, the first lens 1, and the fourth lens 4 or the seventh lens 7 are aspherical lenses. By combining different lenses, it has optical properties such as large aperture, high pixel, large aperture, and good thermal aberration correction. Specifically, in this embodiment, the first lens 1 and the seventh lens 7 are preferably glass aspherical lenses.

[0217] Still further, as a preferred embodiment of the present invention rather than a limitation, the system aperture stop 8 is located between the fourth lens 4 and the fifth lens 5, close to the object side of the fifth lens 5. It can adjust the beam size and is beneficial to balance the front and rear port apertures of the optical system, and the overall shape of the optical system is moderate; at the same time, with the aperture stop centered, different lenses combined with each other and the optical power reasonably distributed, it has optical properties such as large aperture, high pixel, large aperture, and good thermal aberration correction.

[0218] Still further, as a preferred embodiment of the present invention rather than a limitation, the refractive index Nd1 and the Abbe number Vd1 of the material of the first lens 1 satisfy: 1.65 < Nd1 < 1.95, 35 < Vd1 < 55. The structure is simple and good optical performance can be guaranteed.

[0219] Even further, as a preferred embodiment of the present invention rather than a limitation, the refractive index Nd2 and the Abbe number Vd2 of the material of the second lens 2 satisfy: 1.65 < Nd2 < 1.95, 35 < Vd2 < 55. The structure is simple and good optical performance can be guaranteed.

[0220] Furthermore, as a preferred embodiment rather than a limitation of the present invention, the refractive index Nd3 and the Abbe number Vd3 of the material of the third lens satisfy: 1.60 < Nd3 < 1.80, 40 < Vd3 < 85. The structure is simple and good optical performance can be ensured.

[0221] Still further, as a preferred embodiment rather than a limitation of the present invention, the refractive index Nd4 and the Abbe number Vd4 of the material of the fourth lens satisfy: 1.70 < Nd4 < 1.90, 35 < Vd4 < 55. The structure is simple and good optical performance can be ensured.

[0222] Even further, as a preferred embodiment rather than a limitation of the present invention, the refractive index Nd5 and the Abbe number Vd5 of the material of the fifth lens satisfy: 1.40 < Nd5 < 1.70, 55 < Vd5 < 85. The structure is simple and good optical performance can be ensured.

[0223] Furthermore, as a preferred embodiment rather than a limitation of the present invention, the refractive index Nd6 and the Abbe number Vd6 of the material of the sixth lens satisfy: 1.70 < Nd6 < 1.95, 15 < Vd6 < 45. The structure is simple and good optical performance can be ensured.

[0224] Furthermore, as a preferred embodiment rather than a limitation of the present invention, the refractive index Nd7 and the Abbe number Vd7 of the material of the seventh lens satisfy: 1.40 < Nd7 < 1.70, 55 < Vd7 < 85. The structure is simple and good optical performance can be ensured.

[0225] Even further, as a preferred embodiment rather than a limitation of this solution, an infrared cut-off filter is provided between the seventh lens 7 and the image plane 9 to transmit visible light and cut off infrared light to prevent red exposure.

[0226] Specifically, as a preferred embodiment rather than a limitation of the present invention, for the optical system of the embodiment of the present invention, the focal length f1 of the first lens 1 = -8.95 mm, the focal length f2 of the second lens 2 = -3.55 mm, the focal length f3 of the third lens 3 = 5.87 mm, the focal length f4 of the fourth lens 4 = 10.11 mm, the focal length f5 of the fifth lens 5 = 6.08 mm, the focal length f6 of the sixth lens 6 = -5.50 mm, and the focal length f7 of the seventh lens 7 = 20.11 mm. The basic parameters of this optical system are shown in the following table:

[0227]

[0228]

[0229] In the above table, along the optical axis from the object plane to the image plane, S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S4 and S5 correspond to the two surfaces of the third lens 3; S6 and S7 correspond to the two surfaces of the fourth lens 4; STO corresponds to the position where the optical system aperture stop 8 is located; S9 and S10 correspond to the two surfaces of the fifth lens 5; S10 and S11 correspond to the two surfaces of the sixth lens 6; S12 and S13 correspond to the two surfaces of the seventh lens 7; S14 and S15 correspond to the two surfaces of the infrared cut-off filter located between the seventh lens 7 and the image plane 9; S16 corresponds to the Sensor imaging plane 9.

[0230] Furthermore, as a preferred embodiment rather than a limitation of the present invention, the surfaces of the first lens 1 and the seventh lens 7 are aspherical and satisfy the following equation:

[0231]

[0232] Wherein the parameter c = 1 / R, which is the curvature corresponding to the radius, y is the radial coordinate, whose unit is the same as the lens length unit, k is the conic quadratic curve coefficient, and a1 to a8 are the coefficients corresponding to each radial coordinate. The aspherical related numerical values of the first lens 1 and the seventh lens 7 are shown in the following table:

[0233]

[0234] From Figures 2 to 6 it can be seen that the optical system in this embodiment has very good anastigmatic performance. By using different lens combinations and reasonably distributing the optical power, optical performances such as large aperture, high pixel, large aperture and good anastigmatism are achieved.

[0235] A camera module at least includes an optical lens, and the above-mentioned vehicle front view optical system is installed inside the optical lens.

[0236] The camera module according to the embodiment of the present invention is mainly composed of 7 lenses. The number of lenses is small, the structure is simple, the cost is low, and the overall shape of the optical system or the camera module is moderate; at the same time, through the mutual combination of different lenses and reasonable distribution of the optical power, it has optical performances such as large aperture, high pixel, large aperture and good anastigmatism, and is applicable to the field of vehicle-mounted lenses.

[0237] As described above, one or more embodiments are provided in combination with specific contents, and it is not considered that the specific implementation of the present invention is only limited to these descriptions. Any approximation or similarity to the method and structure of the present invention, or any technical deduction or replacement made under the premise of the concept of the present invention, should be regarded as the protection scope of the present invention.

Claims

1. A vehicle front - view optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence along the optical axis from the object plane to the image plane; characterized in that, The object - side of the first lens is convex, the image - side is concave, and its optical power is negative; The object - side of the second lens is concave, the image - side is concave, and its optical power is negative; The object - side of the third lens is convex, the image - side is convex, and its optical power is positive; The object - side of the fourth lens is convex, the image - side is flat, and its optical power is positive; The object - side of the fifth lens is convex, the image - side is convex, and its optical power is positive; The object - side of the sixth lens is concave, the image - side is convex, and its optical power is negative; The object - side of the seventh lens is convex, the image - side is convex, and its optical power is positive; Each lens of the optical system satisfies the following conditions: f1 = - 8.95mm, f2 = - 3.55mm, focal length f3 = 5.87mm, focal length f4 = 10.11mm, focal length f5 = 6.08mm, focal length f6 = - 5.50mm, focal length f7 = 20.11mm, -5 < f1 / f < - 0.2; -5 < f2 / f < - 0.2; 0.2 < f3 / f < 5; 0.8 < f4 / f < 10; 0.2 < f5 / f < 5; -5 < f6 / f < - 0.2; 0.8 < f7 / f < 10; Wherein, f is the focal length of the entire optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens; The refractive index Nd1 and Abbe number Vd1 of the material of the first lens satisfy: Nd1 = 1.76, Vd1 = 49.2; The refractive index Nd2 and Abbe number Vd2 of the material of the second lens satisfy: Nd2 = 1.80, Vd2 = 46.6; The refractive index Nd3 and Abbe number Vd3 of the material of the third lens satisfy: Nd3 = 1.72, Vd3 = 54.6; The refractive index Nd4 and Abbe number Vd4 of the material of the fourth lens satisfy: Nd4 = 1.80, Vd4 = 40.9; The refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy: Nd5 = 1.48, Vd5 = 70.4; The refractive index Nd6 and Abbe number Vd6 of the material of the sixth lens satisfy: Nd6 = 1.84, Vd6 = 23.8; The refractive index Nd7 and Abbe number Vd7 of the material of the seventh lens satisfy: Nd7 = 1.49, Vd7 = 81.

5.

2. The vehicle-mounted front view optical system according to claim 1, characterized in that The optical system satisfies TTL / EFL ≤ 6.7, where TTL is the distance from the vertex of the object - side of the first lens of the optical system to the image plane, and EFL is the effective focal length of the optical system.

3. The vehicle front - view optical system according to claim 1 or 2, characterized in that, The second lens and the third lens are glued together to form a combined lens; and / or The fifth lens and the sixth lens are glued together to form a combined lens.

4. The vehicle front view optical system according to claim 1 or 2, characterized in that, The first lens, and the fourth lens or the seventh lens are aspherical lenses.

5. The vehicle-mounted front view optical system according to claim 1 or 2, characterized in that The system aperture is located between the fourth lens and the fifth lens.

6. An imaging module, at least comprising an optical lens, characterized in that, The vehicle front view optical system according to any one of claims 1-5 is installed in the optical lens.

Images