WO2023174368A1 - 一种投光装置、测距装置及电子设备 - Google Patents

一种投光装置、测距装置及电子设备 Download PDF

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Publication number
WO2023174368A1
WO2023174368A1 PCT/CN2023/081838 CN2023081838W WO2023174368A1 WO 2023174368 A1 WO2023174368 A1 WO 2023174368A1 CN 2023081838 W CN2023081838 W CN 2023081838W WO 2023174368 A1 WO2023174368 A1 WO 2023174368A1
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Prior art keywords
light
light projection
optical system
lens
zoom lens
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PCT/CN2023/081838
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English (en)
French (fr)
Inventor
野田英希
柿本刚
大畑笃
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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Publication of WO2023174368A1 publication Critical patent/WO2023174368A1/zh
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C3/00—Measuring distances in line of sight; Optical rangefinders
    • G01C3/02—Details
    • G01C3/06—Use of electric means to obtain final indication
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/484—Transmitters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification

Definitions

  • the present application relates to the technical field of optical elements, and specifically to a light projecting device, a distance measuring device and an electronic device.
  • ranging modules that measure the distance to an object
  • ranging modules are also installed in smartphones.
  • ToF Time of Flight
  • light is irradiated toward the object and the light reflected on the surface of the object is detected, and the distance of the object is calculated based on the measured value of the flight time of the light. distance.
  • an irradiation method there are a method of irradiating from a light-emitting element in a light-emitting optical system through a diffractive optical element (Diffractive Optical Element, DOE), a method of irradiating a plurality of points arranged in a matrix, and a method of irradiating from a light-emitting element through a diffusion optical element. And the surface irradiation method that irradiates continuous diffused light.
  • DOE diffractive Optical Element
  • the light In the case of point irradiation, the light is concentrated into a point and the intensity of the light can be maintained even at a long distance. Therefore, the distance of a relatively distant object can be measured with the limited power of the light source.
  • the case of surface irradiation light is uniformly irradiated within the irradiation surface, so irradiation can be performed with high resolution.
  • the disadvantage of being a point illumination is that the in-plane resolution is limited by the distance between adjacent points.
  • the disadvantage of surface irradiation is that as the distance to the object increases, the amount of light irradiated per unit surface decreases, so the measurement distance is limited to short distances.
  • the light emitted from the light source can be corrected into parallel light.
  • the focal length of the light projection optical system is made variable for each subject distance, and measures are performed to switch between point irradiation and surface irradiation.
  • the above-mentioned optical system uses a lens that is driven in the direction of the optical axis within the light projection optical system, so it is not suitable for smartphones and the like that have thickness restrictions.
  • Another method in the related art uses two illumination modules, point illumination and diffuse light, to obtain the advantages of both within a certain thickness limit.
  • the problems in the thickness direction of these methods are solved, the cost increases due to the two irradiation modules, and the size in the width direction becomes very large.
  • At least one embodiment of the present application provides a light projection device, a distance measuring device and an electronic device, which can switch to point illumination or area illumination according to the distance measurement distance while maintaining the size of the light projection optical system used in the distance measurement module. irradiation.
  • embodiments of the present application provide a light projecting device, including a light emitting light source and a light projecting optical system, wherein a zoom lens is disposed on the optical axis of the light projecting optical system, and wherein the zoom lens is not In the case of movement in the direction of the optical axis, the zoom lens can change the focus position according to the drive signal.
  • embodiments of the present application provide a distance measuring device, a light-receiving element and a light-receiving optical system, which also include the light projecting device as described above.
  • embodiments of the present application provide an electronic device including the distance measuring device as described above.
  • the light projection device, distance measuring device and electronic equipment provided by the embodiments of the present application can help achieve point illumination or surface illumination by switching in the light projection optical system by using a zoom lens. For miniaturization of device structure.
  • Figure 1 is a schematic diagram of a point irradiation scheme in the related art
  • Figure 2 is a schematic structural diagram of a light projecting device according to an embodiment of the present application.
  • Figure 3 is a schematic diagram of the light projecting device performing point illumination according to the embodiment of the present application.
  • Figure 4 is a schematic diagram of surface illumination by the light projection device according to the embodiment of the present application.
  • Figure 5 is a schematic structural diagram of a light projecting device according to another embodiment of the present application.
  • Figure 6 is a schematic diagram of the light projecting device reducing the spot diameter according to another embodiment of the present application.
  • Figure 7 is a schematic diagram of common point irradiation in another embodiment of the present application.
  • Figure 8 is a schematic diagram of spot irradiation after reducing the spot diameter in another embodiment of the present application.
  • Figure 9 is a schematic structural diagram of a light projecting device according to another embodiment of the present application.
  • Figure 10 is a schematic diagram of illumination of a light projecting device according to another embodiment of the present application.
  • first, second, etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It is to be understood that the figures so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in orders other than those illustrated or described herein, and that "first,” “second,” etc. are distinguished Objects are usually of one type, and the number of objects is not limited. For example, the first object can be one or multiple.
  • “and/or” in the description and claims indicates at least one of the connected objects, and the character “/" generally indicates that the related objects are in an "or” relationship.
  • the zoom lens described in the embodiment of the present application is based on the premise that the element does not move in the direction of the optical axis but applies a voltage to change the focus position.
  • There are many candidates such as a liquid lens, a thin film lens, and a liquid crystal lens.
  • the distance measuring device described in the embodiment of the present application includes a light-emitting element, a light-emitting optical system, a light-receiving element, a light-receiving optical system, etc.
  • the distance-measuring device returns light from the light-emitting element to the light-receiving element after being reflected by the object.
  • the imaged light information is used to calculate distance.
  • the distance is calculated based on the information of the imaged light.
  • the distance is calculated based on the interval between imaging points.
  • the distance to the object is calculated based on the time from light emission to light reception.
  • the distance calculation based on the time is roughly divided into calculation based on direct time measurement. Type and time calculation based on the phase difference between emitting light and receiving light.
  • Embodiments of the present application provide a light projection device, which particularly contributes to improving the performance of the light projection optical system.
  • the light projecting device includes a light emitting light source and a light projecting optical system, wherein the light projecting optical system A zoom lens is disposed on the optical axis, wherein the zoom lens can change the focus position according to the drive signal when the zoom lens does not move in the optical axis direction.
  • the zoom lens may include a first driving state and a second driving state, wherein in the first driving state, the light emitted by the light emitting light source is configured as point illumination after passing through the light projection optical system. ; In the second driving state, the light emitted by the light emitting light source is configured as surface illumination after passing through the light projection optical system.
  • the zoom lens includes but is not limited to a liquid lens, a film lens or a liquid crystal lens.
  • the light projection device of the embodiment of the present application configures the zoom lens in the optical axis direction at an appropriate position within the lens of the light projection optical system, drives the zoom lens according to the ranging distance, and switches to an appropriate irradiation method, such as point irradiation or surface irradiation.
  • the light projecting device of the embodiment of the present application may further include a driving module for driving the zoom lens according to the ranging distance, so that the light projecting device switches to point illumination or surface illumination.
  • the distance measuring device includes a light emitting device and a light receiving device, wherein the light emitting device emits a light source 11 and a light emitting optical system 12 , the light-receiving device includes a light-receiving element 13 and a light-receiving optical system 14 .
  • the light projection optical system 12 includes a collimating lens 102 and a DOE 101. Among them, the laser light irradiated from the light-emitting element is transmitted to the DOE 101 through the collimating lens 102, so that a plurality of points arranged in a matrix are irradiated to the measurement area.
  • the light projection device effectively configures a zoom lens that does not move in the direction of the optical axis within the lens of the light projection optical system, and uses DOE in combination, thereby being able to switch between point illumination and surface illumination.
  • the light projection optical system also includes a DOE 201, and the zoom lens 202 is located between the DOE 201 and the light source.
  • a zoom lens 202 that does not move in the optical axis direction is disposed between the light-emitting element and the DOE 201. That is to say, the zoom lens 202 is fixed in the optical axis direction.
  • the driving range of this refractive index is such that the laser intensity is 45% or more relative to the peak intensity.
  • the light projecting device shown in FIG. 2 has the following advantages: in the distance measuring device using the light projecting device of the above embodiment, especially in the light projecting optical system, point illumination or surface illumination is realized by switching. Contributes to miniaturization of device structure. Therefore, when point irradiation is performed as the irradiation light for irradiating an object as shown in FIG. 3 , the density of light can be increased and the measurement distance can be extended. on the other hand, In order to improve the distance measurement of short-distance unirradiated points, measurement can be performed with high resolution by changing the refractive index of the zoom lens and switching to surface illumination as shown in Figure 4.
  • the light projection optical system may further include a DOE and a collimating lens, wherein: on the optical axis in a direction away from the light source, the collimating lens, the collimating lens and the collimating lens are arranged in sequence.
  • the zoom lens and the diffractive optical element; or, the collimating lens, the diffractive optical element and the zoom lens are arranged in sequence on the optical axis in a direction away from the light source.
  • another embodiment of the present application can simplify the design by configuring the zoom lens 501 on the object side of the DOE 502. Similar to FIG. 2 , this embodiment uses a zoom lens 501 that does not move in the optical axis direction in the light projection optical system. Furthermore, the zoom lens 501 may be positioned on the object side of the DOE or on the light-emitting element side.
  • FIG. 6 when the point irradiation method is adopted, the zoom lens 501 reduces the diameter of each point irradiated onto the object 504 .
  • Figures 7 and 8 are schematic diagrams of normal spot irradiation and high-power spot irradiation that reduces the spot diameter.
  • the light projection device shown in FIG. 5 has the following advantage: by reducing the spot diameter of spot irradiation, the resolution of the spot can be improved, thereby achieving the effect of preventing distance measurement errors when irradiating distant objects. Due to the effect of reducing the spot diameter, the distance between spots becomes wider and therefore the unirradiated area becomes larger, so it is necessary to pay attention.
  • Yet another embodiment of the present application also realizes flexible viewing angle operation in point illumination by utilizing the optical power of the zoom lens.
  • multiple zoom lenses may be used. That is to say, in the light projection device according to another embodiment of the present application, there are at least two zoom lenses.
  • the light projection optical system also includes a DOE 802 and a collimating lens 801, wherein on the optical axis ( like laser), the collimating lens 801, DOE 802 and at least two zoom lenses 803 are arranged in sequence.
  • the zoom lens can also be disposed between the collimating lens and the DOE. At this time, the collimating lens and at least two The zoom lens and DOE.
  • the angle of view can be adjusted widely to perform measurement.
  • the viewing angle can be narrowed to measure.
  • the light projecting device shown in FIGS. 9 and 10 has the advantage that by narrowing the viewing angle, the distance between points in point irradiation can be shortened, thereby improving the resolution. It should be noted that the range of illumination for points within the imaging angle of view is narrowed. However, when measuring distances to objects that exist far away, there are many scenes in the center of the camera angle of view. Therefore, it is beneficial to focus on point illumination only in the center of the camera angle of view to increase the resolution.
  • embodiments of the present application also provide a distance measuring device, which not only includes the light projecting device as shown in Figure 2, Figure 5 and Figure 9, but also includes a light receiving device.
  • the light-receiving device includes a light-receiving element and a light-receiving optical system.
  • Figure 1 For the specific structure, please refer to Figure 1 .
  • embodiments of the present application also provide an electronic device, such as a smart phone, including the distance measuring device described above.
  • the embodiment of the present application takes the projection optical system applied in ToF as an example and proposes the idea of using a zoom lens
  • the embodiment of the present application can not only be applied to the projection optical system of ToF. And it can be used in general light projecting devices.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Measurement Of Optical Distance (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

一种投光装置、测距装置及电子设备，投光装置包括发光光源（11）和投光光学系统（12），其中，投光光学系统（12）的光轴上配置有变焦镜头（501），且变焦镜头（501）固定在光轴方向上。

Description

一种投光装置、测距装置及电子设备
相关申请的交叉引用
本申请主张于2022年3月18日在日本提交的日本专利申请第2022-044466的优先权，其全部内容通过引用包含于此。
技术领域
本申请涉及光学元件技术领域，具体涉及一种投光装置、测距装置及电子设备。
背景技术
近年来，测量到物体的距离的测距模块的小型化得到推进，在智能手机中也搭载了测距模块。如上述，在飞行时间(Time of Flight，ToF)方式的测距模块中，使光朝向物体照射并检测在物体表面反射来的光，基于测量该光的飞行时间的测量值来计算到物体的距离。
作为照射方法，有从投光光学系统内的发光元件透过衍射光学元件(Diffractive Optical Element，DOE)，作为配置成矩阵状的多个点照射而照射的方法、从发光元件透过扩散光学元件而照射连续的扩散光的面照射方法。
点照射的情况下，光被聚成点，即使是远距离也能够维持光的强度，因此能够以有限的光源的电力来测量比较远的对象物的距离。另一方面，在面照射的情况下，在照射面内，均匀地照射光，因此能够以高分辨率进行照射。
作为点照射的缺点是面内的分辨率受限于相邻的点间距离。另外，面照射的缺点是对象物的距离变大时，单位面内照射的光量下降，因此测量距离限于近距离。
在光源与DOE之间插入准直透镜，可以将从光源发出的光校正为平行光，但是随着因大气衰减到测量对象物的距离变远，照射也逐渐衰减。与此相对，在相关技术的一种方法中，按照每个被摄体距离使投光光学系统的焦距为可变式，执行针对点照射和面照射进行切换的对策。但是，在上述光学系统中，使用在投光光学系统内在光轴方向驱动的镜头，因此不适用于有厚度限制的智能手机等。
相关技术的另一种方法，使用点照明和扩散光这两个照射模块，在具有一定厚度限制内也能够得到两者的优点。然而，这些方法在厚度方向的问题虽然被解决，但是两个照射模块导致成本上升，并且宽度方向的尺寸变得非常大。
发明内容
本申请的至少一个实施例提供了一种投光装置、测距装置及电子设备，在维持测距模块中使用的投光光学系统的尺寸的同时，能够根据测距距离切换为点照射或面照射。
为了解决上述技术问题，本申请是这样实现的：
第一方面，本申请实施例提供了一种投光装置，包括发光光源和投光光学系统，其中，所述投光光学系统的光轴上配置有变焦镜头，其中，在所述变焦镜头未在光轴方向上发生移动的情况下，所述变焦镜头能够根据驱动信号改变焦点位置。
第二方面，本申请实施例提供了一种测距装置，受光元件和受光光学系统，还包括如上所述的投光装置。
第三方面，本申请实施例提供了一种电子设备，包括有如上所述的测距装置。
与相关技术相比，本申请实施例提供的投光装置、测距装置及电子设备，通过采用变焦镜头，从而在投光光学系统中通过切换来实现点照射或面照射的同时，能够有助于装置结构的小型化。
附图说明
图1为相关技术中的一种点照射方案的示意图；
图2为本申请实施例的投光装置的一种结构示意图；
图3为本申请实施例的投光装置进行点照射的示意图；
图4为本申请实施例的投光装置进行面照射的示意图；
图5为本申请另一实施例的投光装置的一种结构示意图；
图6为本申请另一实施例的投光装置缩小点直径的示意图；
图7为本申请另一实施例中通常的点照射的示意图；
图8为本申请另一实施例中缩小点直径后的点照射的示意图；
图9为本申请又一实施例的投光装置的一种结构示意图；
图10为本申请又一实施例的投光装置的照射示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请的说明书和权利要求书中的术语“第一”、“第二”等是用于区别类似的对象，而不用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施，且“第一”、“第二”等所区分的对象通常为一类，并不限定对象的个数，例如第一对象可以是一个，也可以是多个。此外，说明书以及权利要求中“和/或”表示所连接对象的至少其中之一，字符“/”，一般表示前后关联对象是一种“或”的关系。
为了帮忙理解本申请的相关方案，下面对本申请涉及的相关概念进行说明。
本申请实施例中记载的变焦镜头以不在光轴方向移动而施加电压来改变焦点位置的元件为前提，存在液体镜头、薄膜镜头、液晶镜头等多个候选。
此外，本申请实施例中记载的测距装置包括发光元件、投光光学系统、受光元件、受光光学系统等部分，该测距装置根据来自发光元件的发光体在对象物反射后返回到受光元件而成像的光的信息来计算距离。根据所成像的光的信息计算距离是根据成像点的间隔计算距离的类型、根据从发光到受光的时间计算与对象物的距离，根据所述时间计算距离大致分为根据直接的时间测量计算的类型和根据发光光和受光光的相位差进行时间计算这两种。
本申请实施例提供了一种投光装置，特别是有助于投光光学系统的高性能化。该投光装置包括发光光源和投光光学系统，其中，所述投光光学系统 的光轴上配置有变焦镜头，其中，在所述变焦镜头未在光轴方向上发生移动的情况下，所述变焦镜头能够根据驱动信号改变焦点位置。
具体的，所述变焦镜头可以包括有第一驱动状态和第二驱动状态，其中，在所述第一驱动状态下，所述发光光源发出的光在经过投光光学系统后被配置为点照射；在所述第二驱动状态下，所述发光光源发出的光在经过投光光学系统后被配置为面照射。所述变焦镜头包括但不限于液体镜头、薄膜镜头或液晶镜头。
这样，本申请实施例的投光装置，在投光光学系统镜头内的适当位置在光轴方向配置变焦镜头，根据测距距离驱动变焦镜头，切换为适当的照射方法，如点照射或面照射。为此，本申请实施例的投光装置，还可以包括驱动模组，用于根据测距距离驱动所述变焦镜头，以使所述投光装置切换为点照射或面照射。
如图1所示，在相关技术的一种测距装置的点照射方案中，该测距装置包括有投光装置和受光装置，其中，所述投光装置发光光源11和投光光学系统12，所述受光装置包括受光元件13和受光光学系统14。所述投光光学系统12包括有准直透镜102和DOE 101。其中，从发光元件照射的激光经由准直透镜102透射至DOE 101，使得配置成矩阵状的多个点被照射到测量区域。
本申请的一个实施例中，所述投光装置在投光光学系统的镜头内有效地配置了不在光轴方向移动的变焦镜头，并结合使用DOE，由此能够切换点照射和面照射。具体的，如图2所示，所述投光光学系统还包括DOE 201，所述变焦镜头202位于所述DOE 201和发光光源之间。该实施例在发光元件和DOE 201之间配置不在光轴方向移动的变焦透镜202。也就是说，所述变焦镜头202固定在光轴方向上。
通过改变变焦透镜202的折射率，能够切换点照射和面照射。该折射率的驱动范围成为激光强度相对于峰值强度为45％以上。
图2所示的投光装置具有以下优点：在应用了以上实施例的投光装置的测距装置中，特别是在投光光学系统中通过切换来实现点照射或面照射的同时，能够有助于装置结构的小型化。由此，当作为照射物体的照射光，如图3所示进行点照射时，可以增加光的密度并且可以延长测量距离。另一方面， 为了提高对短距离未照射点的部分的距离测量，能够如图4所示，通过改变变焦镜头的折射率并切换到面照射，从而以高分辨率进行测量。
作为相关技术的一种方法，有使用音圈电机(Voice Coil Motor，VCM)的方法、在测距模块中设置点照射和面照射这两种投光光学系统的方法，但存在大型化的确定。在本申请的以上实施例中，通过使用在光轴方向上不移动的变焦透镜，能够在不增大装置尺寸的情况下实现上述优点。
本申请实施例中，所述投光光学系统还可以包括DOE和准直透镜，其中：在所述光轴上沿着远离所述发光光源的方向上，依次设置有所述准直透镜、所述变焦镜头和所述衍射光学元件；或者，在所述光轴上沿着远离所述发光光源的方向上，依次设置有所述准直透镜、所述衍射光学元件和所述变焦镜头。
例如，如果投光装置在光轴方向的空间存在余量，则如图5所示，本申请另一实施例可以通过将变焦透镜501配置在DOE 502的物体侧上来简化设计。与图2类似，该实施例在投光光学系统中使用在光轴方向不移动的变焦透镜501。并且，变焦透镜501的位置可以在DOE的物体侧，也可以在发光元件侧。
此时，如图6所示，在采用点照射方式时，通过变焦透镜501缩小照射到物体504的各个点的直径。图7和图8则是通常的点照射和缩小点直径的高功率的点照射的示意图。
图5所示的投光装置具有以下优点：通过缩小点照射的点直径，能够提高点的分辨率，从而达到防止照射到远方的物体的测距错误的效果。由于缩小了点直径的影响，导致点间的距离变宽，因此未照射的面积变大，因此需要注意。
本申请又一实施例还实现了利用变焦透镜的光功率来进行点照射中的灵活的视角操作。但是，在变焦透镜的光功率对于视角操作不充分的情况下，可以使用多个变焦透镜。也就是说，本申请又一实施例的投光装置中，所述变焦镜头至少有两个。
如图9所示，本申请又一实施例的投光装置中，所述投光光学系统还包括DOE 802和准直透镜801，其中，在所述光轴上沿着远离所述发光光源(如 laser)的方向上，依次设置有所述准直透镜801、DOE 802和至少两个所述变焦镜头803。可选的，变焦镜头也可以设置在准直透镜和DOE之间，此时，在所述光轴上沿着远离所述发光光源的方向上，依次设置有所述准直透镜、至少两个所述变焦镜头和DOE。
作为基本的动作，针对比较近距离的对象物804，如图9所示，可以以较宽地调整视角来进行测量。针对远方的对象物，如图10所示，可以缩小视角来进行测量。
图9和图10所示的投光装置具有以下优点：通过缩小视角能够缩短点照射中的点间距离，从而能够提高分辨率。需要注意针对成像视角内的点照射的范围变窄。但是，针对存在于远方的对象的测距时，测量摄像视角的中央的场景较多，因此，仅对摄像视角的中央集中进行点照射，提高分辨率是有益的。
基于以上的各个实施例提供的投光装置，本申请实施例还提供了一种测距装置，不仅包括有如图2、图5和图9中所示的投光装置，还包括有受光装置，其中，所述受光装置包括有受光元件和受光光学系统，具体结构可以参考图1。
进一步的，本申请实施例还提供了一种电子设备，如智能手机等，包括有以上所述的测距装置。
另外，需要说明的是，本申请实施例虽然是以应用于ToF中的投影光学系统为例，提出了使用变焦透镜的想法，但是，本申请实施例不仅可以应用于ToF的投光光学系统，而且可以应用于一般投光装置中。
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本申请的保护之内。

Claims (11)

  1. 一种投光装置，包括发光光源和投光光学系统，其中，所述投光光学系统的光轴上配置有变焦镜头，其中，在所述变焦镜头未在光轴方向上发生移动的情况下，所述变焦镜头能够根据驱动信号改变焦点位置。
  2. 根据权利要求1所述的投光装置，其中，所述变焦镜头包括有第一驱动状态和第二驱动状态，其中，在所述第一驱动状态下，所述发光光源发出的光在经过投光光学系统后被配置为点照射；在所述第二驱动状态下，所述发光光源发出的光在经过投光光学系统后被配置为面照射。
  3. 根据权利要求2所述的投光装置，其中，所述变焦镜头为液体镜头、薄膜镜头或液晶镜头。
  4. 根据权利要求2所述的投光装置，其中，所述变焦镜头固定在光轴方向上。
  5. 根据权利要求1至4任一项所述的投光装置，其中，所述投光光学系统还包括衍射光学元件，所述变焦镜头位于所述衍射光学元件和发光光源之间。
  6. 根据权利要求1至4任一项所述的投光装置，其中，所述投光光学系统还包括衍射光学元件和准直透镜，其中：
    在所述光轴上沿着远离所述发光光源的方向上，依次设置有所述准直透镜、所述变焦镜头和所述衍射光学元件；
    或者，
    在所述光轴上沿着远离所述发光光源的方向上，依次设置有所述准直透镜、所述衍射光学元件和所述变焦镜头。
  7. 根据权利要求1至3任一项所述的投光装置，其中，所述变焦镜头至少有两个。
  8. 根据权利要求7所述的投光装置，其中，所述投光光学系统还包括衍射光学元件和准直透镜，其中，在所述光轴上沿着远离所述发光光源的方向上，依次设置有所述准直透镜、所述衍射光学元件和至少两个所述变焦镜头。
  9. 根据权利要求7所述的投光装置，其中，所述投光光学系统还包括衍 射光学元件和准直透镜，其中，在所述光轴上沿着远离所述发光光源的方向上，依次设置有所述准直透镜、至少两个所述变焦镜头和所述衍射光学元件。
  10. 一种测距装置，包括：受光元件和受光光学系统，还包括如权利要求1至9任一项所述的投光装置。
  11. 一种电子设备，包括有根据权利要求10所述的测距装置。
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