WO2021218647A1

WO2021218647A1 - Optical system, camera module, and electronic device

Info

Publication number: WO2021218647A1
Application number: PCT/CN2021/087407
Authority: WO
Inventors: 冯坤亮; 黄怀毅; 李宗政; 吴木源
Original assignee: 江西欧迈斯微电子有限公司
Priority date: 2020-04-30
Filing date: 2021-04-15
Publication date: 2021-11-04
Also published as: CN211826851U

Abstract

An optical system (10), a camera module (100), and an electronic device (1000). The optical system (10) comprises: a light source (12) which emits a light beam (122) with a wavelength of 1300-1600 nm; a converging member (14) provided on one side of the light source (12) to converge the light beam (122) emitted by the light source (12); and a light homogenization member (16) provided on one side of the converging member (14) away from the light source (12) to uniformly diffuse the converged light beam to an illuminated object. According to the camera module (100), a light beam with a wavelength of 1300-1600 nm emitted by the light source (12) sequentially passes through the converging member (14) for convergence and the light homogenization member (16), and is then uniformly diffused to the illuminated object, such that the problem that long-term illumination with a light beam with a wavelength of 940 nm is unfavorable for human vision is solved, and the light spot reaching the illuminated object has a clear contour, which achieves a good illumination effect and is safer for human eyes.

Description

Optical system, camera module and electronic device

Technical field

This application relates to the field of optics and electronics technology, in particular to an optical system, a camera module and an electronic device.

Background technique

The depth camera module can obtain the depth information of the target to realize 3D face recognition, 3D scanning, scene modeling, and gesture interaction. It is gradually being valued by all walks of life, such as the use of depth camera module combined with TV, computer, etc. Somatosensory games can be realized to achieve the two-in-one effect of game and fitness. For example, the combination of depth camera modules and mobile devices such as tablets and mobile phones can achieve a very real AR game experience, which can be used for indoor map creation, navigation and other functions.

The core component in the depth camera module is the optical system. At present, the optical system uses a vertical-cavity surface-emitting laser (VCSEL) to directly cooperate with a homogenizing element to achieve the effect of homogenized illumination. In the process of realizing this application, the inventor found that there are at least the following problems in the prior art: Since the wavelength of the beam emitted by the vertical cavity surface emitting laser is usually 940 nm, the long-term illumination of the beam in this wavelength band will cause harm to human eyesight. Impact.

Summary of the invention

In view of the above, it is necessary to provide an optical system, a camera module and an electronic device to solve the above problems.

An embodiment of the present application provides an optical system, including:

Light source, emitting a light beam with a wavelength of 1300nm-1600nm;

The converging member is arranged on one side of the light source and is used to condense the light beam emitted by the light source; and

The homogenizing member is arranged on the side of the converging member away from the light source, and is used for uniformly spreading the concentrated light beam to the illuminated object.

The above-mentioned optical illumination system solves the problem of long-term illumination of light beams with wavelengths of 940nm in the prior art by sequentially converging the light sources of light beams with a wavelength of 1300nm-1600nm through a converging part and uniformly diffusing the light homogenizing parts. The problem that is unfavorable to human eyesight makes the outline of the light spot reaching the illuminated object clear, the lighting effect is better, and the light beam with the wavelength of 1300nm-1600nm is safer for human eyes.

The embodiment of the application also provides a camera module, including:

Lens; and

In the above-mentioned optical system, the optical system is arranged on one side of the lens.

The above-mentioned camera module solves the problem that the light source of the light beam with the wavelength of 1300nm-1600nm is uniformly diffused to the illuminated object after the light source with the wavelength of 1300nm-1600nm is converged by the converging part and the light homogenizing part. The problem that is unfavorable to human eyesight makes the outline of the light spot reaching the illuminated object clear, the lighting effect is better, and the light beam with the wavelength of 1300nm-1600nm is safer for human eyes.

The embodiment of the present application also provides an electronic device, including:

Shell; and

In the above-mentioned camera module, the camera module is mounted on the housing.

The above-mentioned electronic device solves the problem that the light source of the light beam with the wavelength of 1300nm-1600nm is uniformly diffused to the illuminated object after the light source of the light beam with the wavelength of 1300nm-1600nm is converged by the converging member and the light homogenizing member. The problem of unfavorable human eyesight makes the outline of the light spot reaching the illuminated object clear, the lighting effect is better, and the light beam with a wavelength of 1300nm-1600nm is safer for the human eye.

Description of the drawings

Fig. 1 is an optical principle diagram of a light source at a fast axis in an optical system according to a first embodiment of the present invention.

Fig. 2 is an optical principle diagram of the light source at the slow axis in the optical system of the first embodiment of the present invention.

Fig. 3 is a light spot diagram obtained without a converging element in the optical system of the embodiment of the present invention.

Fig. 4 is a light spot diagram obtained after a converging element is provided in the optical system of the embodiment of the present invention.

Fig. 5 is an optical principle diagram of the light source at the fast axis in the optical system according to the second embodiment of the present invention.

Fig. 6 is an optical principle diagram of the light source at the slow axis in the optical system of the second embodiment of the present invention.

Fig. 7 is an optical principle diagram of the light source at the fast axis in the optical system of the third embodiment of the present invention.

Fig. 8 is an optical principle diagram of the light source at the slow axis in the optical system of the third embodiment of the present invention.

Fig. 9 is an optical principle diagram of the light source at the fast axis in the optical system of the fourth embodiment of the present invention.

Fig. 10 is an optical principle diagram of the light source at the slow axis in the optical system of the fourth embodiment of the present invention.

FIG. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Symbol description of main components

Electronic device 1000

Camera module 100

Optical system

10, 20, 30, 40

Light source

12, 22, 32, 42

Beam 122, 222, 322, 422

Gathering Piece 14, 24, 34, 44

Cross section

142, 242, 342

Homogeneous parts

16, 26, 36, 46

Lens 50

Shell 200

Detailed ways

The following describes the embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The following embodiments described with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, but should not be understood as a limitation to the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", Clockwise, "Counterclockwise" and other directions or positions indicated The relationship is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does 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 It cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The features defined with “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the present invention, “multiple” means two or more , Unless otherwise specifically defined.

In the description of the present invention, it should be noted that the terms "installed", "connected", and "connected" should be understood in a broad sense unless otherwise clearly specified and limited. For example, they can be fixed or detachable. Connected or integrally connected; it can be mechanically connected, or electrically connected or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication of two components or the interaction of two components relation. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood according to specific situations.

In the present invention, unless expressly stipulated and defined otherwise, the "above" or "below" of the first feature of the second feature may include direct contact between the first and second features, or may include the first and second features Not in direct contact but through other features between them. Moreover, the "above", "above" and "above" of the first feature on the second feature include the first feature directly above and obliquely above the second feature, or it simply means that the first feature is higher in level than the second feature. The “below”, “below” and “below” of the first feature of the second feature include the first feature directly above and diagonally above the second feature, or it simply means that the level of the first feature is smaller than the second feature.

The following disclosure provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numerals and/or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and/or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and/or the use of other materials.

Please refer to FIG. 1, the optical system 10 of the embodiment of the present invention includes a light source 12, a converging member 14 and a light homogenizing member 16.

Specifically, the light source 12 is used to emit a light beam 122 with a wavelength of 1300 nm-1600 nm. The converging member 14 is arranged on one side of the light source 12 and is used to condense the light beam 122 emitted by the light source 12. The homogenizing member 16 is arranged on the side of the converging member 14 away from the light source 12, and is used to uniformly diffuse the focused light beam 122 to the illuminated object (not shown).

In this embodiment, light sources with wavelengths of less than 1300nm and greater than 1600nm are either unstable, or costly, or are harmful to the human eye, and are not suitable for uniform lighting; while light sources with wavelengths of 1300nm-1600nm are more stable and costly. Low, and beneficial to human eyes, suitable for industrial production.

In some embodiments, the converging member 14 has any one of a partial cylindrical shape, a cylindrical shape, a partial elliptical shape, and an elliptical shape. Among them, the partial cylindrical shape may be a semi-cylindrical shape, and the partial elliptical shape may be a semi-elliptical shape.

In the optical system 10 of the embodiment of the present invention, because the light beam 122 with a wavelength of 1300nm-1600nm emitted by the light source 12 has a large spread angle, the light spot reaching the illuminated object is diffused, and the converging member 14 can make the spread angle larger. The light beam 122 is converged after passing through a partially cylindrical, cylindrical, partially elliptical or elliptical light-transmitting material, so that the light spot reaching the object is uniform and the outline is clear.

In some embodiments, the converging member 14 is semi-cylindrical.

In the optical system 10 of the embodiment of the present invention, when the convergent member 14 is semi-cylindrical, the light beam enters the convergent member from the cross section 142 of the convergent member 14, and is emitted after converging on the arc surface opposite to the cross section 142. Partially elliptical or elliptical converging members 14 and semi-cylindrical converging members 14 have a better convergence effect, and the light spot finally reaching the object is also more uniform and the outline is clearer.

In some embodiments, the converging member 14 is any one of quartz, glass, or optical plastic.

In the optical system 10 of the embodiment of the present invention, quartz, glass, or optical plastic are all light-transmitting materials, and are arranged in a partially cylindrical, cylindrical, partially elliptical, or elliptical shape to converge the light beam 122 with a larger spread angle .

In some embodiments, the refractive index of the converging member 14 is 1.4-2.0.

In the optical system 10 of the embodiment of the present invention, the converging member 14 has a better converging effect in the above-mentioned refractive index range, and the refractive index of the converging member 14 can be adjusted within the above-mentioned range, so that the light source 12 has a larger spreading effect. The angled beam 122 is condensed into a beam 122 with a desired divergence angle. When the refractive index of the converging member 14 is less than 1.4 or greater than 2.0, the converging effect of the converging member 14 is poor, so that the part of the light spot reaching the object is not uniform.

In some embodiments, the light source 12 is an edge-emitting laser light source or a distributed feedback laser light source.

In the optical system 10 of the embodiment of the present invention, the wavelength of the light beam 122 emitted by the edge-emitting laser light source and the distributed feedback laser light source are both within 1300 nm-1600 nm, and the light beam 122 is relatively stable and low in cost.

_{In some embodiments, the divergence angle θ 1} of the unconverged light beam 122 emitted by the light source 12 in the fast axis direction is 30° to 50°, and the divergence angle θ ₂ in the slow axis direction is 6° to 14°. Referring to FIG. 3, the light spot of the unfocused light source 12 is relatively diffuse after reaching the illuminated object, and the lighting effect is poor. The divergence angle of the converged light beam emitted by the light source in the fast axis is 6° to 14°, and the divergence angle in the slow axis direction is 6° to 14°.

It should be noted that the light source emits a light beam in the X axis direction, and the light beam has a divergence angle in both the fast axis direction and the slow axis direction. The fast axis direction is the Z axis direction in Figure 1 and the slow axis direction is the Y axis in Figure 2 direction.

In the optical system 10 of the embodiment of the present invention, the convergent member 14 has a tortuosity of zero in the slow axis direction of the light beam, that is, the convergent member 14 does not adjust the divergence angle of the light beam in the slow axis direction; the convergent member 14 The fast axis direction of the corresponding beam has a positive tortuosity, and the light beam enters the converging member 14 to be refracted and converged. By adjusting the positive tortuosity of the converging member 14 corresponding to the fast axis direction of the beam according to actual needs, the unconverged beam emitted by the light source 12 can be made The divergence angle of 122 in the fast axis direction is the same as that in the slow axis, and a uniform, clear-profile light spot is obtained. Referring to FIG. 4, after the convergent light source 12 reaches the illuminated object, the spot is uniform, the outline is clear, and the lighting effect is better.

In some embodiments, the light homogenizing member 16 is a diffusion sheet.

The diffuser in the optical system 10 of the embodiment of the present invention can atomize the condensed light beam and evenly diffuse it to the object to be illuminated.

In some embodiments, the transmittance of the light homogenizing member 16 is greater than 90%.

In the optical system of the embodiment of the present invention, the homogenizing member 16 is used to uniformly diffuse the condensed light beam. When the transmittance is greater than 90%, the converged light beam 122 can be atomized more uniformly in the homogenizing member 16. Therefore, the atomized light beam 122 is uniformly diffused to the illuminated object. When the transmittance is less than or equal to 90%, the converged part of the light beam 122 cannot be uniformly diffused after passing through the light homogenizing member 16, so that the part of the light spot reaching the object is uneven.

The first embodiment

Please continue to refer to FIG. 1, the optical system 10 in this embodiment includes a light source 12, a converging member 14 and a light homogenizing member 16.

Specifically, the light source 12 is used to emit a light beam 122 with a wavelength of 1300 nm. The converging member 14 is made of quartz material and has a semi-cylindrical shape. The converging member 14 is arranged on one side of the light source 12 to condense the light beam 122 emitted by the light source 12. Specifically, the light beam 122 enters the converging member from the cross section 142 of the converging member 14 In 14, after being converged, it is transmitted from the other side to the light homogenizing member 16. The homogenizing member 16 is arranged on the side of the converging member 14 away from the light source 12, and is used to uniformly diffuse the focused light beam 122 to the illuminated object (not shown). The cross section 142 is a plane.

_{In this embodiment, the divergence angle θ 1} of the light source 12 without convergence in the fast axis direction is 40°, and the divergence angle θ ₂ of the light source 12 after convergence in the fast axis direction is 9.967°.

_{Referring to FIG. 2, the divergence angle θ 3} of the light source 12 without convergence in the slow axis direction _{is 10°, and the divergence angle θ 4} of the light source 12 after convergence in the slow axis direction is 10°.

The optical illumination system 10 of this embodiment solves the problem that the light source 12 of the light beam 122 with a wavelength of 1300 nm is condensed by the converging member 14 and the light homogenizing member 16 is uniformly diffused to the illuminated object. The long-term lighting is unfavorable to human eyesight, so that the outline of the light spot reaching the object is clear, the lighting effect is better, and it is safer for the human eye.

Second embodiment

Referring to FIG. 5, the optical system 20 in this embodiment includes a light source 22, a converging member 24 and a light homogenizing member 26.

Specifically, the light source 22 is used to emit a light beam with a wavelength of 1450 nm. The convergent member 24 is supported by quartz material and is semi-cylindrical. The convergent member 24 is arranged on one side of the light source 22 to condense the light beam emitted by the light source 22. Specifically, the light beam 222 enters the convergent member 24 from the cross section 242 of the convergent member 24 After being converged, it is transmitted from the other side to the light homogenizing member 26. The light homogenizing member 26 is arranged on the side of the converging member 24 away from the light source 22 for uniformly spreading the focused light beam to the illuminated object (not shown). The cross section 242 is a plane.

_{In this embodiment, the divergence angle θ 5} of the light source 22 without focusing in the fast axis direction _{is 40°, and the divergence angle θ 6} of the light source 22 after focusing on the fast axis is 9.972°.

_{Referring to FIG. 6, the divergence angle θ 7} of the light source 22 without convergence in the slow axis direction _{is 10°, and the divergence angle θ 8} of the light source 12 after convergence in the slow axis direction is 10°.

It should be noted that the light source emits a light beam in the X axis direction, and the light beam has a divergence angle in both the fast axis direction and the slow axis direction, where the fast axis direction is the Z axis direction in Figure 5, and the slow axis direction is the Y axis in Figure 6. direction.

The optical illumination system 20 of this embodiment solves the problem of the beam with a wavelength of 940 nm in the prior art by condensing the light source 22 of the beam with a wavelength of 1450 nm through the converging member 24 and then uniformly spreading the light source 22 through the homogenizing member 26. The problem of unfavorable eyesight under long-term illumination makes the outline of the light spot reaching the illuminated object clear, the lighting effect is better, and it is safer for the human eye.

The third embodiment

Referring to FIG. 7, the optical system 30 in this embodiment includes a light source 32, a condensing member 34 and a light homogenizing member 36.

Specifically, the light source 32 is used to emit a light beam 322 with a wavelength of 1600 nm. The converging member 34 is supported by a quartz material and has a semi-cylindrical shape. The converging member 34 is arranged on one side of the light source 32 for converging the light beam 322 emitted by the light source 32. Specifically, the light beam 322 enters the converging member 34 from the cross section 342 of the converging member 34 Inside, after being converged, it is transmitted from the other side to the light homogenizing member 36. The light homogenizing member 36 is disposed on the side of the converging member 34 away from the light source 32, and is used to uniformly diffuse the concentrated light beam 322 to the illuminated object (not shown). The cross section 342 is a plane.

_{In this embodiment, the divergence angle θ 9} of the light source 22 without convergence in the fast axis direction is 40°, and the divergence angle θ ₁₀ of the light source 22 after convergence in the fast axis direction is 10°.

_{Referring to FIG. 8, the divergence angle θ 11} of the light source 12 without convergence in the slow axis direction _{is 10°, and the divergence angle θ 12} of the light source 12 after convergence in the slow axis direction is 10°.

It should be noted that the light source emits a light beam in the X axis direction, and the light beam has a divergence angle in both the fast axis direction and the slow axis direction, where the fast axis direction is the Z axis direction in Fig. 7 and the slow axis direction is the Y axis in Fig. 8 direction.

The optical illumination system 20 of this embodiment solves the problem of the light beam with a wavelength of 940 nm in the prior art by sequentially converging the light source 22 of the beam with a wavelength of 1600 nm through the converging member 24 and then uniformly spreading the light source 22 to the object to be illuminated. The problem of unfavorable eyesight under long-term illumination makes the outline of the light spot reaching the illuminated object clear, the lighting effect is better, and it is safer for the human eye.

Fourth embodiment

Referring to FIG. 9, the optical system 40 in this embodiment includes a light source 42, a converging member 44 and a light homogenizing member 46.

Specifically, the light source 42 is used to emit a light beam with a wavelength of 1300 nm. The converging member 44 is supported by a quartz material and has a cylindrical shape. The converging member 44 is arranged on one side of the light source 42 and is used to condense the light beam emitted by the light source 42. The homogenizing member 46 is arranged on the side of the converging member 44 away from the light source 42 and is used to uniformly diffuse the focused light beam to the illuminated object (not shown).

_{In this embodiment, the divergence angle θ 13} of the light source 42 without focusing in the fast axis direction _{is 40°, and the divergence angle θ 14} of the light source 42 after focusing on the fast axis is 9.9°.

_{Referring to FIG. 10, the divergence angle θ 15} of the light source 42 without convergence in the slow axis direction _{is 10°, and the divergence angle θ 16} of the light source 42 after convergence in the slow axis direction is 10°.

It should be noted that the light source emits a light beam in the X axis direction, and the light beam has a divergence angle in both the fast axis direction and the slow axis direction, where the fast axis direction is the Z axis direction in Figure 9 and the slow axis direction is the Y axis in Figure 10 direction.

The optical illumination system 40 of this embodiment solves the problem of the light beam with a wavelength of 940 nm in the prior art by condensing the light source 22 of the beam with a wavelength of 1300 nm through the converging member 44 and uniformly spreading the light homogenizing member 46 to the illuminated object. The problem of unfavorable eyesight under long-term illumination makes the outline of the light spot reaching the illuminated object clear, the lighting effect is better, and it is safer for the human eye.

From the above-mentioned first, second and third embodiments, it can be obtained that the light beams with wavelengths of 1300nm, 1450nm and 1600nm emitted by the light source in the fast axis direction are condensed by the converging element. The divergence angle approaches or is equal to the light source at The divergence angle of the emission in the slow axis direction has a clear outline of the light spot reaching the illuminated object, and the lighting effect is better.

From the above-mentioned first and fourth embodiments, it can be obtained that the divergence angles of the light beams of the same wavelength emitted in the fast axis direction after being converged by different cylindrical converging elements are close to the divergence angles of the light source in the slow axis direction. , The outline of the spot reaching the illuminated object is clear, and the lighting effect is better.

Referring to FIG. 11, the optical illumination system 10 of the embodiment of the present invention can be applied to the camera module 100 of the embodiment of the present invention. The camera module 100 includes a lens 50 and the optical system 10 of any of the above embodiments. The optical system 10 is installed on one side of the lens 50. The camera module 100 may be a time-of-flight ranging module. The distance between the camera module 10 and the object is determined by detecting the time when the light beam emitted from the optical system 10 reaches the lens 50 after being emitted by the object, so as to obtain the object. Three-dimensional information of the object.

Please continue to refer to FIG. 11, the camera module 100 of the embodiment of the present invention can be applied to the electronic device 1000 of the embodiment of the present invention. The electronic device 1000 includes a housing 200 and a camera module 100, and the camera module 100 is installed on the housing 200.

The electronic device 100 of the embodiment of the present invention includes, but is not limited to, smart phones, tablet computers, notebook computers, e-book readers, portable multimedia players (PMP), portable phones, video phones, digital still cameras, and mobile medical devices. , Wearable devices and other electronic devices that support imaging.

For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended to fall into the claims. All changes within the meaning and scope of the equivalent elements of are included in the present invention.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements are made without departing from the spirit and scope of the technical solution of the present invention.

Claims

An optical system, characterized in that it comprises:

Light source, emitting a light beam with a wavelength of 1300nm-1600nm;

The converging member is arranged on one side of the light source to condense the light beam emitted by the light source; and

The homogenizing member is arranged on the side of the converging member away from the light source, so as to uniformly diffuse the concentrated light beam to the illuminated object.
The optical system according to claim 1, wherein the converging member is any one of a partial cylindrical shape, a cylindrical shape, a partial elliptical shape, or an elliptical shape.
3. The optical system of claim 2, wherein the converging member is semi-cylindrical.
3. The optical system of claim 2, wherein the converging member is any one of quartz, glass, or optical plastic.
The optical system according to any one of claims 2 to 4, wherein the refractive index of the converging member is 1.4-2.0.
The optical system of claim 1, wherein the light source is an edge-emitting laser light source or a distributed feedback laser light source.
The optical system according to claim 6, wherein the divergence angle of the unconverged light beam emitted by the light source in the fast axis direction is 30° to 50°, and the divergence angle in the slow axis direction is 6° to 14° °, the divergence angle of the converged light beam emitted by the light source in the fast axis is 6° to 14°, and the divergence angle in the slow axis direction is 6° to 14°.
The optical system of claim 1, wherein the transmittance of the light homogenizing member is greater than 90%.
A camera module is characterized in that it comprises:

Lens; and

The optical system according to any one of claims 1 to 8, the optical system is arranged on one side of the lens.
An electronic device, characterized in that it comprises:

Shell; and

The camera module of claim 9, wherein the camera module is mounted on the housing.