WO2019024205A1

WO2019024205A1 - Panoramic optical system and electronic device

Info

Publication number: WO2019024205A1
Application number: PCT/CN2017/103344
Authority: WO
Inventors: 倪功望; 杨欢丽; 刘玉芳; 卢昆利
Original assignee: 武汉赫天光电股份有限公司
Priority date: 2017-07-31
Filing date: 2017-09-26
Publication date: 2019-02-07
Also published as: CN107219615A

Abstract

A panoramic optical system and an electronic device. The panoramic optical system comprises two groups of fisheye optical systems; each group of fisheye optical systems comprises a front lens group, a reflection prism, a diaphragm element, and a rear lens group that are arranged sequentially from an object side to an image side; reflection surfaces of two isosceles right-angled reflection prisms in the two groups of fisheye optical systems are glued to form a gluing prism; the front lens group comprises a first lens element and a second lens element; the diaphragm element is located between a light-exiting surface of the reflection prism and the rear lens group; the rear lens group comprises a third lens element, a fourth gluing lens element, and a fifth lens element; and the front lens groups of the two groups of fisheye optical systems are aligned to a vertical optical axis, the rear lens groups are aligned to a horizontal optical axis, and the intersection between the horizontal optical axis and the vertical optical axis is overlapped with the geometrical center of the gluing prism. The panoramic optical system can narrow an area which cannot be imaged, and improve the imaging quality of a panoramic image.

Description

Panoramic optical system and electronic equipment

Cross-reference to related applications

The present application claims the priority of the Chinese Patent Application No. JP-A--------

Technical field

The present application relates to the field of optics, and in particular to the technical field of optical imaging systems, and more particularly to panoramic optical systems and electronic devices.

Background technique

With the continuous development of optical design technology and the continuous expansion of the field of camera lens applications, wide-angle camera lenses are becoming more and more popular. For example, some security monitoring devices, car video recording devices, sports DV devices, and camera lenses in virtual reality devices need to have a larger field of view. The panoramic optical system usually uses two sets of wide-angle camera lenses with an angle of view of more than 180° to achieve spherical dead angle shooting.

In the design of the above panoramic optical system, although the angle of view of each group of wide-angle imaging lenses exceeds 180°, that is, the maximum luminous flux coverage angle of each group of wide-angle imaging lenses exceeds 180°, since usually the wide-angle imaging lens has a certain size. In the maximum luminous flux of the two wide-angle imaging lenses, there is an area that does not overlap each other, and objects in the area cannot be imaged. The existing panoramic optical system is limited by the requirements of image quality and cannot be further reduced in size. The area of the maximum luminous flux of the two sets of wide-angle lenses that do not overlap each other is large, which limits the application of the panoramic optical system.

Summary of the invention

In order to solve one or more of the technical problems mentioned in the background section above, embodiments of the present application provide a panoramic optical system and an electronic device.

In a first aspect, an embodiment of the present application provides a panoramic optical system including two groups of fish In the optical system of the eye, each group of fisheye optical systems is arranged in order from the object side to the image side: a front lens group, a reflective prism, an aperture element, and a rear lens group, and two isosceles right angle reflections in the two fisheye optical systems. The reflecting surface of the prism is glued to form a cementing prism; the front mirror group is located on the light incident side of the isosceles right angle reflecting prism, the optical element and the rear mirror group are located on the light emitting surface side of the isosceles right angle reflecting prism; the front mirror group includes along the object side to Arranged in order from the side: the first lens element, the object side of the first lens element is convex, the image side of the first lens element is concave; the second lens element, the object side of the second lens element is convex, and the second lens element The image side is concave; the pupil element is located between the light exit surface of the reflective prism and the rear mirror group; the rear lens group includes the third lens element, the object side and the image of the third lens element arranged in order from the object side to the image side The side surface is a convex surface; the fourth cemented lens element is formed by bonding a lens having a convex side to the side of the object and a lens having a concave surface on both the object side and the image side; the fifth lens element, the fifth through The object side and the image side of the component are convex; the front mirror groups of the two fisheye optical systems are aligned on the vertical optical axis, and the rear mirror groups of the two fisheye optical systems are aligned on the horizontal optical axis, and the horizontal optical axis is The intersection of the vertical optical axes overlaps the geometric center of the cemented prism.

In some embodiments, the refractive index of the cemented prism is not less than 1.8 for light having a wavelength of 589.3 nm, and the Abbe number of the light having a wavelength of 589.3 nm is not less than 20.

In some embodiments, the focal length f of the fisheye optical system satisfies 1 mm ≤ f ≤ 1.5 mm, and the field of view of the single group of fisheye optical systems is not less than 200°.

In some embodiments, the reflective faces of the two isosceles right angle reflective prisms are the same size.

In some embodiments, the distance between the two triangular faces of the isosceles right angle reflective prism is not equal to the length of the right angled sides of the triangular faces in the isosceles right angle reflective prism.

In some embodiments, the panoramic optical system further includes a body barrel member; the body barrel member includes two front mirror ends and two rear mirror ends, and is formed between the two front mirror ends and between the two rear mirror ends a cavity; the front mirror end is cylindrical, the two front mirror ends are aligned on the vertical optical axis, and the two front mirror ends are respectively used to accommodate the front lens groups of the two fisheye optical systems; the rear mirror end is cylindrical. The two rear mirror ends are aligned on a horizontal optical axis, and the two rear mirror ends are respectively used to accommodate a rear lens group of two sets of fisheye optical systems; the cavity is for receiving a cemented prism.

In some embodiments, one of the front mirror ends is disposed on a side close to the cavity, and a first bearing surface is disposed on a side of the rear mirror end adjacent to the cavity; the first bearing surface has a first bearing surface; a through hole communicating with the cavity, the second bearing surface has a through hole communicating with the cavity; the cemented prism An isosceles right angle reflecting prism includes a first right angle surface and a second right angle surface, the first right angle surface bears against the first bearing surface, and the second right angle surface bears against the second bearing surface; wherein The luminous flux effective diameter of the straight surface is larger than the luminous flux effective diameter of the second orthogonal surface; the portion of the first orthogonal surface contacting the first bearing surface is located outside the effective diameter of the luminous flux of the first orthogonal surface, and the second orthogonal surface and the second bearing The portion in contact with the face is located outside the effective diameter of the light flux of the second right angle face.

In some embodiments, a side of the rear mirror end adjacent to the cavity is formed with a groove extending in a direction perpendicular to the optical axis, and an edge of the cementing prism is located in the groove; the bonding prism is bonded through the groove The agent is bonded to the body barrel member.

In some embodiments, the second lens element of one of the fisheye optical systems is in contact with the cementing prism by a through hole disposed on the first bearing surface, and the second lens element of the other group of fisheye optical systems Contact with the cemented prism; there is a gap between the other rear mirror end and the cemented prism except for the rear mirror end provided with the second bearing surface.

In a second aspect, an embodiment of the present application provides an electronic device, including a camera, where the camera includes the above-mentioned panoramic optical system.

The panoramic optical system and the electronic device provided by the embodiments of the present application adopt a combination of two sets of fisheye optical systems, and use a cemented prism as a reflecting surface to change the optical path, which can reduce the volume of the panoramic optical system, reduce the area of the unimageable area, and ensure good. The quality of the image.

DRAWINGS

Other features, objects, and advantages of the present application will become more apparent from the detailed description of the accompanying drawings.

1 is a schematic structural view of a panoramic optical system according to an embodiment of the present application;

2 is a schematic diagram of a field curvature curve of a panoramic optical system for different wavelengths of light according to an embodiment of the present application;

3 is a schematic diagram of a distortion curve of a panoramic optical system for different wavelengths of light according to an embodiment of the present application;

4 is a schematic diagram of aberration curves of a panoramic optical system for different wavelengths of light according to an embodiment of the present application;

FIG. 5 is an optical transfer function curve diagram of a panoramic optical system according to an embodiment of the present application. intention;

6 is a schematic structural view of a cementing prism in a panoramic optical system according to an embodiment of the present application;

7 is a schematic perspective view of a main body of the main body of the embodiment of the present application;

Figure 8 is a cross-sectional structural view of the main body barrel member shown in Figure 7;

Figure 9 is a schematic view showing the relative positional relationship between the cementing prism and the bearing surface of the main body cylinder member;

Figure 10 is a top plan view of the main body barrel member shown in Figure 7;

11 is a schematic structural view of a panoramic optical system according to an embodiment of the present application;

FIG. 12 is a schematic front structural view of an electronic device according to an embodiment of the present application; FIG.

FIG. 13 is a schematic diagram of a back structure of an electronic device according to an embodiment of the present application; FIG.

FIG. 14 is a schematic cross-sectional view of an electronic device according to an embodiment of the present application.

Detailed ways

The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention, rather than the invention. It is also to be noted that, for the convenience of description, only the parts related to the related invention are shown in the drawings.

It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 , which illustrates a structural schematic diagram of a panoramic optical system according to an embodiment of the present application.

As shown in Figure 1, the panoramic optical system includes two sets of fisheye optical systems, each having a field of view angle of greater than 180[deg.]. Each group of fisheye optical systems includes a front lens group 10, an isosceles right angle reflecting prism 30, an aperture element S, and a rear lens group 20, which are sequentially arranged from the object side to the image side. The reflective surfaces of the two isosceles right angle reflecting prisms in the two groups of fisheye optical systems are glued to form a cemented prism.

The front lens group 10 is located on the light incident surface side of the isosceles right angle reflection prism 30, the aperture element S and the rear lens group 20 are located on the light exit surface side of the isosceles right angle reflection prism 30, and the aperture element S is located on the light exit surface of the reflection prism 30 and Between the rear mirror groups 20. The entrance surface of the isosceles right angle reflection prism 30 It is a right-angled surface, and the light-incident side is the side where the effective diameter of the luminous flux is large, that is, the side of the effective diameter of the received light is large, and the light-emitting surface of the isosceles right-angle interference prism 30 is the other right-angled surface, and the light-emitting surface side The side with the smaller effective diameter of the luminous flux is the side with the smaller effective diameter of the outgoing light.

The front lens group 10 includes a first lens element 11 and a second lens element 12 which are sequentially arranged from the object side to the image side, wherein the object side surface of the first lens element 11 is convex, and the image side surface of the first lens element 11 is concave The second lens element 12 is located on the image side surface of the first lens element 11, the object side surface of the second lens element 12 is convex, and the image side surface of the second lens element 12 is concave.

The rear lens group 20 includes a third lens element 21, a fourth cemented lens element 22, and a fifth lens element 23 which are sequentially arranged from the object side to the image side. The object side surface and the image side surface of the third lens element 21 are both convex surfaces; the object side surface of the fourth cemented lens element 22 is a convex surface, and the image side surface is a concave surface, and the lens 221 and the object side surface of each of the object side surface and the image side surface are convex surfaces. The lens 222 having a concave surface on both sides is cemented; the object side surface and the image side surface of the fifth lens element 23 are both convex.

In the present embodiment, the light emitted from the front lens group 10 is reflected by the isosceles right angle reflection prism 30 and is incident on the rear mirror group 20. The front lens group 10 is arranged on the vertical optical axis V, the rear lens group 20 is arranged on the horizontal optical axis H, and the horizontal optical axis H and the vertical optical axis V are perpendicular to each other. The front lens groups of the two groups of fisheye optical systems are aligned on the vertical optical axis V, and the rear lens groups of the two groups of fisheye optical systems are aligned on the horizontal optical axis H, and the intersection of the horizontal optical axis H and the vertical optical axis V is The collection centers of the cemented prisms overlap. That is, the horizontal optical axes of the two groups of fisheye optical systems are on the same straight line, and the vertical optical axes of the two groups of fisheye optical systems are on the same straight line.

Further, each of the above-mentioned fisheye optical systems may further include an imaging surface IMA located on the image side of the fifth lens element 23.

As can be seen from FIG. 1, in the panoramic optical system of the present embodiment, the number of lenses of each group of fisheye optical systems is small, and the light is folded by 90° by the isosceles right angle reflecting prism, which can effectively reduce the two of the panoramic optical systems. The distance between the object surface (ie, the object side surfaces of the two first lens elements) can further narrow the area where the maximum luminous flux of the two groups of fisheye optical systems does not overlap, and the area of the area that cannot be imaged is reduced, and each group can be guaranteed. The image distortion at the edge of the fisheye optical lens is small, so that the images collected by the two groups of fisheye optical systems are obtained. The panoramic image has a small distortion and achieves good image quality.

In some embodiments, the focal length f of each group of fisheye optical systems satisfies 1 mm ≤ f ≤ 1.5 mm, optionally, f = 1.04 mm; the field of view of the single group of fisheye optical systems is not less than 200°, optionally The angle of view of the single-group fisheye optical system can be 210°. In this way, it can be ensured that the imaging surface of each group of fisheye optical system is closer to the center position of the panoramic optical system, which is advantageous for reducing the volume of the panoramic optical system, and ensuring that each group of fisheye optical systems has a sufficiently large angle of view, thereby Further reduce the area of the area that cannot be imaged.

In some embodiments, the cemented prism has a refractive index of not less than 1.8 for light having a wavelength of 589.3 nm, and the bonded prism has an Abbe number of not less than 20 for light having a wavelength of 589.3 nm. The isosceles right angle reflecting prism in the cemented prism can have a refractive index of 1.84667 and an Abbe number of 23.79. The isosceles right angle reflecting prism adopts a material with a higher refractive index, and can make the optical path in the isosceles right angle reflecting prism. A path length much larger than the actual light is beneficial to reduce the size of the fisheye optical system, thereby reducing the volume of the panoramic optical system. Alternatively, the above-described isosceles right angle reflecting prism may be made of optical glass H-ZF52A.

Alternatively, the first lens element 11, the second lens element 12, the third lens element 21, the fourth cemented lens element 22, and the fifth cemented lens element 23 are each a spherical lens made of a glass material.

Table 1 shows the optical parameters of the lens elements of a single group of fisheye optical systems in one embodiment of the present application, wherein the

surface numbers

1, 2, 3, 4 are in turn the object side of the first lens element 11, the first lens The image side surface of the element 11, the object side surface of the second lens element 12, and the image side surface of the second lens element 12, and the surface numbers 5, 6, 7, and 8 are sequentially the light incident surface (plane) of the isosceles right angle reflection prism 30, and the like. The reflecting surface (plane) of the waist right angle reflecting prism 30, the light emitting surface (plane) of the isosceles right angle reflecting prism 30, the pupil (planar), and the

surface numbers

9, 10, 11, 12, 13, 14, 15 are in order The object side surface of the lens element 21, the image side surface of the third lens element 21, the object side surface of the lens 221 in which the object side surface and the image side surface of the fourth cemented lens element are convex, and the object side surface and the image side surface of the fourth cemented lens element are both The image side surface of the convex lens 221, the image side surface of the lens 222 in which the object side surface and the image side surface of the fourth cemented lens element are concave, the object side surface of the fifth lens element 23, and the image side surface of the fifth lens element 23, surface number 16 For the imaging surface IMA. Where the thickness D is negative, the light is deflected by 90°, and the absolute value is the thickness of the component corresponding to the surface. Refractive index Nd means pair The refractive index of light having a wavelength of 589.3 nm and the Abbe number Vd represent the Abbe number of light having a wavelength of 589.3 nm.

The fisheye optical system shown in Table 1 has a focal length of 1.04 mm, an F number of 2.2, and an angle of view of 210°.

Table 1 Optical parameters of each lens element of the fisheye optical system

表面序号Surface number	曲率半径R值/mmCurvature radius R value / mm	厚度D/mmThickness D/mm	折射率NdRefractive index Nd	阿贝数Vd Abbe number Vd
11	13.9513.95	1.201.20	1.8348101.834810	42.730042.7300
22	3.063.06	1.331.33
33	6.906.90	0.850.85	1.755001.75500	52.320052.3200
44	3.033.03	1.351.35
55	∞∞	2.702.70	1.8466701.846670	23.790023.7900
66	∞(反射面)∞ (reflecting surface)	-2.70-2.70	1.8466701.846670	23.790023.7900
77	∞∞	-0.49-0.49
88	∞(光阑)∞(光阑)	-0.01-0.01
99	-7.36-7.36	-2.81-2.81	1.9036641.903664	31.320031.3200
1010	6.236.23	-0.05-0.05
1111	-3.96-3.96	-1.51-1.51	1.7130001.713000	53.830053.8300
1212	3.053.05	-0.93-0.93	1.8081081.808108	22.690022.6900
1313	-2.83-2.83	-0.12-0.12
1414	-5.86-5.86	-1.58-1.58	1.7130001.713000	53.830053.8300
1515	7.947.94	-1.60-1.60
1616	∞(像面)∞ (image surface)

The two sets of fisheye optical systems respectively receive light from two symmetry objects, and form two images on the imaging surface, and the two images are spliced to obtain a panoramic image.

Figures 2 to 5 show the imaging performance curves of the fisheye optical system using the optical parameters shown in Table 1, wherein Figure 2 is a schematic diagram of the curvature of field for different wavelengths of light, and Figure 3 is the F- of different wavelengths of light. Schematic diagram of the θ distortion curve, FIG. 4 is a schematic diagram of aberration curves for different wavelengths of light, and FIG. 5 is a schematic diagram of an optical transfer function curve.

As can be seen from Fig. 2, the fisheye optical system has a field curvature of less than 3 mm at the maximum angle of view, and the curvature of field curve is less than the longitudinal axis. As can be seen from Fig. 3, the above-mentioned fisheye optical system has an F-θ distortion of less than 7% at the maximum angle of view, that is, the edge of the fisheye optical system described above. The distortion is small, which is beneficial to reduce the distortion when splicing the images collected by the two groups of fisheye optical systems to generate panoramic images.

Figure 4 shows a Ray Fan plot of each field of view that can characterize the overall aberrations of the fisheye optics. Among them, the abscissas PX and PY are the normalized pupil coordinates of the light on the meridional fan and the normalized pupil coordinates of the rays on the sagittal fan, and the ordinates EX and EY are the rays in the meridional fan. The relative distance from the position of the chief ray on the image plane and the relative distance between the ray in the sagittal fan and the position of the chief ray on the image plane. The meridional fan and the sagittal fan are the beam profile of the X-axis of the over-optical 和 and the beam profile of the Y-axis of the over-optical 分别. It can be seen from Fig. 4 that the relative distances between different light rays and the principal ray on the image plane of the meridional and sagittal fans are small at each angle of view, indicating that the fisheye optical system has small aberrations and good Imaging performance.

Figure 5 shows the MTF (Modulation Transfer Function) curve at different angles of view, where the diffraction limit represents the limit value curve of the optical transfer function, with an optical resolution of 200 lp/mm (pair/mm). The limit of the transfer function is approximately 0.67. Figure 5 also shows the MTF curves for the 0° field of view, 0.7 times the half field of view (74°), the half field of view (105°) meridional direction (T) and the sagittal direction (S). It can be seen that the attenuation rate of the MTF value increases with the resolution. When the resolution reaches 200 line pairs/mm, the MTF values of each field of view are greater than 0.25, which proves that the fisheye optical system provided by the embodiment of the present application has good. Imaging performance.

Please refer to FIG. 6 , which is a schematic structural view of a cementing prism in the panoramic optical system of the embodiment of the present application, that is, two isosceles right angle reflecting prisms in the two groups of fisheye optical systems shown in FIG. 1 . 30 Schematic diagram of the structure after gluing.

As shown in Fig. 6, two isosceles right angle reflecting prisms are glued at the reflecting surface, and the reflecting surfaces 61 of the two isosceles right angle reflecting prisms have the same size. The reflecting surface of the isosceles right angle reflecting prism is rectangular, the lengths of the reflecting surfaces of the two isosceles right angle reflecting prisms are equal, and the widths of the reflecting surfaces of the two isosceles right angle reflecting prisms are also equal. In this embodiment, the reflective film can be attached to the two reflective surfaces, and the two reflective surfaces have the same size, so that the two reflective surfaces can be more closely adhered to the reflective film, and the effective area of the reflective surface of the cemented prism is increased. , to reduce the size of the panoramic optical system. Under the premise of ensuring the luminous flux requirement, the size of the reflecting surface does not affect the imaging quality of the panoramic optical system.

Further, the distance PT between the two parallel triangular faces 62 and 63 of the isosceles right angle reflecting prism and the length PW of the right angle sides of the triangular faces 62 or 63 in the isosceles right angle reflecting prism may not be equal. In the actual scene, the length PW of the right angle side and the distance PT of the two triangular face pieces can be designed according to the effective diameter of the light flux incident on the reflective prism and the structure and size of the panoramic optical system.

In some embodiments, the panoramic optical system provided by the present application may further include a main body barrel member, as shown in FIG. 7, which shows a schematic perspective view of the main body barrel member of the embodiment of the present application.

The body barrel member of the present embodiment includes two front mirror ends 71, 72 and two rear mirror ends 73, 74, and is formed between the two front mirror ends 71, 72 and between the two rear mirror ends 73, 74. The cavity 75. The front mirror ends 71, 72 are cylindrical, the two front mirror ends 71, 72 are aligned on the vertical optical axis V of the panoramic optical system, and the two front mirror ends 71, 72 are respectively used to accommodate two sets of fisheye optical systems. The front lens group 10. The rear mirror ends 73, 74 are cylindrical, the two rear mirror ends 73, 74 are aligned on the horizontal optical axis H of the panoramic optical system, and the two rear mirror ends 73, 74 are respectively used to accommodate the two sets of fisheye optical systems. Mirror set 20. The cavity 75 is for receiving a cemented prism formed by gluing two isosceles right angle reflecting prisms 30.

The main body barrel member shown in Fig. 7 can be designed to form a structure having a cavity in accordance with the outer shape of the fisheye optical system, and the main body barrel member can accommodate the two sets of fisheye optical systems to fix and protect the fisheye optical system.

Further, referring to FIG. 8 and FIG. 9, FIG. 8 is a schematic cross-sectional structural view of the main body barrel member shown in FIG. 7, and FIG. 9 is a schematic view showing the relative positional relationship between the gluing prism and the bearing surface of the main body barrel member.

As shown in FIG. 8, one side of the front end of the main body barrel member near the cavity is provided with a first bearing surface 81 (only the first bearing surface is shown in FIG. 8, and the specific structure of the front end is not shown). a side of the rear mirror end 73 adjacent to the cavity is provided with a second bearing surface 82. The first bearing surface 81 has a through hole 810 communicating with the cavity, and the second bearing surface 82 has a connection with the cavity. Through hole 820. Optionally, the size of the through hole 810 of the first bearing surface 81 is not smaller than the size of the second lens element, so that the second lens element can be in contact with the cementing prism at the through hole 810; the second bearing surface 82 The area of the through hole 820 is not less than the effective working area of the aperture element so that the light emitted from the glue prism can be entirely transmitted to the aperture element.

As shown in FIG. 9, one of the isosceles right-angle reflecting prisms in the cementing prism 70 includes a first right-angled surface and a second right-angled surface, the first right-angled surface bears against the first bearing surface 81, and the second right-angled surface bears against The second bearing surface 82 is on. The first right angle surface is an incident surface, which is opposite to the front mirror group, and the second right angle surface is an exit surface, which is opposite to the rear mirror group. The effective diameter of the first right angle surface is larger than the effective diameter of the second right angle surface. Here, the portion of the first right angle surface that is in contact with the first bearing surface 81 is located outside the effective diameter of the first right angle surface, and the portion of the second right angle surface that is in contact with the second bearing surface 82 is located at the second right angle surface. The luminous flux is outside the effective diameter. In this way, it is ensured that the light is not blocked by the first bearing surface and the second bearing surface, resulting in a deterioration in image quality.

Further, as shown in FIG. 8 and FIG. 9, the side of the rear mirror end 73 near the cavity may be formed with a groove 731 extending in the direction of the vertical optical axis V, and the edge of the cementing prism 70 is located in the groove. Within 731. Another side of the rear mirror end 74 adjacent to the cavity may also be formed with a groove extending in the direction of the vertical optical axis V in which the other two right-angled sides of the cemented prism 70 are located.

Fig. 10 is a top plan view showing the main body barrel member shown in Fig. 7. As shown in FIG. 10, an adhesive 732 is disposed in the recess 731 of the rear mirror end 73, and the cementing prism 70 is bonded to the main body cylinder member by an adhesive 732 provided in the recess 731. In this way, the cemented prism can be reliably fixed on the main body cylinder component. During the assembly process, the glue prism can be firstly supported on the first bearing surface and the second bearing surface, and the glue is inserted into the groove. And curing to achieve the fixation of the cemented prism, simplifying the assembly process of the cemented prism, and reducing the assembly cost.

Further, as shown in FIG. 10, the rear mirror end of the second bearing surface is 73, and the other rear mirror end 74 and the cementing prism 70 except the rear mirror end 73 of the second bearing surface are provided. There is a gap between them (733 as shown in Fig. 10) such that the

rear mirror end

73 or 74 is asymmetrical about the vertical optical axis V. And, a second lens element of one of the fisheye optical systems is in contact with the cementing prism through a through hole disposed on the first bearing surface, and the second lens element of the other group of fisheye optical system is coupled with the cemented prism contact. That is, the second lens element in the two sets of front mirror groups can be pressed onto the cemented prism. In assembly, the two rear mirror ends can be assembled first, and then a set of front lens groups can be assembled into the front end of the first bearing surface, and then the glue prism can be placed on the first bearing surface. And close to the second bearing surface, because it is glued at the time of design A gap is reserved between the split prism and a rear mirror end, and the glue prism can be easily placed in the intermediate cavity. Thereafter, the second lens element of the other set of rear mirror sets can be pressed onto the cemented prism, and then the first lens element can be placed on the second lens element, thus ensuring a certain machining error. The gluing prism can be placed into the cavity during assembly while minimizing the distance between the two front end faces (i.e., the object side of the two first lens elements) to reduce the area of the non-imageable area. Moreover, the gap between the cemented prism and the rear mirror end does not affect the imaging performance of the panoramic optical system.

Further, when assembling the fisheye optical system and the main body barrel member, a pressing ring for fixing the first lens element may be mounted on the object side surface of the front mirror group, and the pressing ring may be annular and have a larger diameter than the first lens. The luminous flux of the component is the effective diameter.

FIG. 11 is a schematic view showing the outline of a panoramic optical system according to an embodiment of the present application. Where P is the intersection of the maximum field of view light LA2 and LB2 of two different object spaces, and Q is the intersection of the maximum field of view light LA1 and LB1 of two different object spaces, surrounded by point P and maximum field of view light LA2, LB2 The spatial portion, and the portion of the space surrounded by the point Q and the maximum field of view rays LA1, LB1 are unimageable regions. Light emitted by an object in the unimageable area cannot be taken as an imaging beam. The shape and structural parameters of the above panoramic optical system are designed as follows: by using a special material of the cemented prism, the balance and compression between the parameters of the lenses, and the space constraints required for the assembly of the mobile phone:

DH is the pressure ring diameter of the front mirror group, L1 is the distance between the vertical optical axis of the panoramic optical system and the point P, and LH1 is the distance from the vertex of the object side of the first lens element to the center of the assembly of the cemented prism, and LH2 is two The distance between the apex of the object side of the first lens element, LH3 is the distance between the maximum field of view light LA2 and LB2 of the two different object spaces at the incident position of the first lens element, and LH4 is the front mirror of two different object spaces. The distance between the edges of the set of pressure rings. Among them, DH is 15.8 mm, L1 is 37.01 mm, LH1 is 6.93 mm, LH2 is 13.86 mm, LH3 is 11.08 mm, and LH4 is 9.76 mm. Figure 11 also shows that the field of view of each group of fisheye optical systems is 210°.

It can be seen that the panoramic optical system of the embodiment of the present application has a thickness along the vertical optical axis of only 13.86 mm, and can be applied to a small-sized electronic device such as a mobile phone.

The embodiment of the present application further provides an electronic device including a camera, which includes the panoramic optical system described in the above embodiments. The above electronic device can be exemplified Such as smart watches, tablets, mobile phones, etc.

12, FIG. 13, and FIG. 14 are respectively a schematic diagram of a front structure, a back structure, and a cross-sectional structure of an electronic device according to an embodiment of the present application.

As shown in FIG. 12 and FIG. 13, the camera C including the panoramic optical system can be mounted on the electronic device E, and the two front lens groups of the panoramic optical system are respectively located on the front and the back of the electronic device, and the panoramic optical system is along the electronic device. The thickness direction runs through the electronic device. In this way, the panoramic optical system can perform panoramic imaging of the front and back of the electronic device E.

Fig. 14 shows an unimageable area of the above electronic device. Since the electronic device causes a certain degree of occlusion of the field of view of the panoramic optical system, the angle of view of obtaining the effective image is reduced, that is, the angle between the maximum object field light FA1 and FA2 entering the panoramic optical system of the same object space is smaller than that of the panoramic optical system. The field of view of the fisheye optical system in a single group. This increases the area of the unimageable area of the panoramic optical system assembled into the electronic device. In this embodiment, the vertical optical axis V of the panoramic optical system can be aligned with the width center line W of the electronic device, and the horizontal optical axis H of the panoramic optical system is aligned with the thickness center line H1 of the electronic device, so that the electronic device can be prevented from being blocked. A lot of light is used to avoid the size of the electronic device as much as possible to increase the area of the unimageable area.

The above electronic device has the advantages of large field of view angle, small distortion of edge field of view, small unimageable area, and small panoramic optical system, which can satisfy small-volume electronic devices (such as mobile phones, smart watches, etc.) in virtual reality and enhancement. The application of the real world.

The above description is only a preferred embodiment of the present application and a description of the principles of the applied technology. It should be understood by those skilled in the art that the scope of the invention referred to in the present application is not limited to the specific combination of the above technical features, and should also be covered by the above technical features or without departing from the above inventive concept. Other technical solutions formed by arbitrarily combining the equivalent features. For example, the above features are combined with the technical features disclosed in the present application, but are not limited to the technical features having similar functions.

Claims

A panoramic optical system, comprising two sets of fisheye optical systems, each set of fisheye optical systems comprising: an object side to an image side arranged in order: a front mirror group, an isosceles right angle reflecting prism, an optical element and a rear a mirror group, wherein the reflective surfaces of two isosceles right angle reflecting prisms in the two sets of fisheye optical systems are glued to form a cemented prism;

The front mirror group is located on a light incident surface side of the isosceles right angle reflection prism, and the aperture element and the rear mirror group are located on a light exit surface side of the isosceles right angle reflection prism;

The front mirror group is arranged in order from the object side to the image side:

a first lens element, an object side surface of the first lens element is a convex surface, and an image side surface of the first lens element is a concave surface;

a second lens element, wherein an object side surface of the second lens element is a convex surface, and an image side surface of the second lens element is a concave surface;

The aperture element is located between the light exit surface of the reflective prism and the rear mirror group;

The rear mirror group is arranged in order from the object side to the image side:

a third lens element, the object side surface and the image side surface of the third lens element are both convex;

a fourth cemented lens element, which is formed by gluing a lens having a convex side on one side and an image side, and a lens having a concave side on both the object side and the image side;

a fifth lens element, the object side surface and the image side surface of the fifth lens element are both convex surfaces;

The front lens groups of the two sets of fisheye optical systems are aligned on a vertical optical axis, the rear lens groups of the two sets of fisheye optical systems are aligned on a horizontal optical axis, the horizontal optical axis and the vertical light The intersection of the axes overlaps the geometric center of the cemented prism.
The panoramic optical system according to claim 1, wherein the cemented prism has a refractive index of not less than 1.8 for light having a wavelength of 589.3 nm, and the Abbe number of the light having a wavelength of 589.3 nm is not less than 20.
The panoramic optical system according to claim 1, wherein the focal length f of the fisheye optical system satisfies 1 mm ≤ f ≤ 1.5 mm, and the field of view of the fisheye optical system of the single set is not less than 200°.
The panoramic optical system according to claim 1, wherein the reflecting surfaces of the two isosceles right-angle reflecting prisms have the same size.
The panoramic optical system according to claim 1, wherein a distance between two triangular faces of the isosceles right-angle reflecting prism is not equal to a length of a right-angled side of the triangular face in the isosceles right-angle reflecting prism.
The panoramic optical system according to claim 1, wherein the panoramic optical system further comprises a body barrel member;

The body barrel member includes two front mirror ends and two rear mirror ends, and a cavity formed between the two front mirror ends and between the two rear mirror ends;

The front mirror end is cylindrical, the two front mirror ends are aligned on the vertical optical axis, and the two front mirror ends are respectively used to accommodate the front mirror groups of the two sets of fisheye optical systems;

The rear mirror end is cylindrical, the two rear mirror ends are aligned on the horizontal optical axis, and the two rear mirror ends are respectively used for accommodating the rear mirror groups of the two groups of fisheye optical systems;

The cavity is for receiving the cemented prism.
The panoramic optical system according to claim 6, wherein a side of said front end closer to said cavity is provided with a first bearing surface, and wherein said rear mirror end is adjacent to said cavity One side has a second bearing surface;

The first bearing surface has a through hole communicating with the cavity, and the second bearing surface has a through hole communicating with the cavity;

One of the equal-waist right-angle reflecting prisms includes a first right-angled surface and a second right-angled surface, the first right-angled surface bears against the first bearing surface, and the second right-angled surface bearing Relying on the second bearing surface;

Wherein the luminous flux effective diameter of the first orthogonal surface is greater than the luminous flux effective diameter of the second orthogonal surface;

a portion of the first right angle surface that is in contact with the first bearing surface is located outside the effective diameter of the first right angle surface, and the second right angle surface is in contact with the second bearing surface The portion of the touch is outside the effective diameter of the luminous flux of the second right-angled face.
The panoramic optical system according to claim 7, wherein a side of the rear mirror end adjacent to the cavity is formed with a groove extending in a direction of the vertical optical axis, the gluing An edge of the prism is located in the groove;

The cemented prism is bonded to the body barrel member by an adhesive disposed in the groove.
A panoramic optical system according to claim 7, wherein a second lens element of said one of said fisheye optical systems is in contact with said cementing prism through a through hole provided in said first bearing surface a second lens element of the other set of the fisheye optical system is in contact with the cementing prism;

There is a gap between the other rear mirror end and the cementing prism except for the rear mirror end provided with the second bearing surface.
An electronic device, comprising: a camera, the camera comprising the panoramic optical system of any of claims 1-9.