CN111352094B - Time-of-flight module, control method thereof, controller and electronic device - Google Patents

Time-of-flight module, control method thereof, controller and electronic device Download PDF

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Publication number
CN111352094B
CN111352094B CN202010144211.8A CN202010144211A CN111352094B CN 111352094 B CN111352094 B CN 111352094B CN 202010144211 A CN202010144211 A CN 202010144211A CN 111352094 B CN111352094 B CN 111352094B
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optical
time
signal
electrical signal
light
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CN111352094A (en
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韦怡
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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    • 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
    • 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
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
    • 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
    • G01S7/486—Receivers
    • G01S7/4865—Time delay measurement, e.g. time-of-flight measurement, time of arrival measurement or determining the exact position of a peak
    • 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
    • G01S7/491—Details of non-pulse systems
    • G01S7/4911—Transmitters
    • 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
    • G01S7/491—Details of non-pulse systems
    • G01S7/4912—Receivers

Abstract

The invention discloses a control method of a flight time module, a controller and an electronic device. The flight time module comprises a first substrate assembly, a cushion block, a photoreceiver, a light emitter and a light detector, wherein the first substrate assembly comprises a first substrate, the cushion block is arranged on the first substrate, the light emitter is arranged on the cushion block, and the photoreceiver is arranged on the first substrate. The control method comprises the following steps: acquiring a calibration electrical signal; controlling the optical transmitter to transmit an optical signal, and controlling the optical receiver to receive the reflected optical signal transmitted by the optical transmitter; controlling the optical detector to convert the optical signal received by the optical receiver into a detection electrical signal; and controlling the working parameters of the light emitter according to the detection electric signal and the calibration electric signal. According to the invention, the light emitter is arranged on the cushion block, the light receiver is arranged on the first substrate, and the cushion block heightens the height of the light emitter, so that the light signal emitted by the light emitter is prevented from being shielded by the light receiver, and the detection precision of the flight time model is improved.

Description

Time-of-flight module, control method thereof, controller and electronic device
The application is a divisional application of a Chinese application with the application number of CN201810963381.1, which is submitted on 08, 22.2018.
Technical Field
The invention relates to the technical field of three-dimensional imaging, in particular to a control method of a time-of-flight module, a controller of the time-of-flight module, the time-of-flight module and an electronic device.
Background
The Time of Flight (TOF) module may calculate depth information of the object to be measured by calculating a Time difference between a Time when the optical transmitter transmits the optical signal and a Time when the optical receiver receives the optical signal. The time of flight module during operation, generally need guarantee the precision of its depth information who obtains to use this depth information better, for example realize better 3D effect and AR and experience.
Disclosure of Invention
The embodiment of the invention provides a control method of a time-of-flight module, a controller of the time-of-flight module, the time-of-flight module and an electronic device.
An embodiment of the present invention provides a method for controlling a time-of-flight module, where the time-of-flight module includes a first substrate assembly, a pad block, an optical receiver, an optical transmitter, and an optical detector, where the first substrate assembly includes a first substrate, the pad block is disposed on the first substrate, the optical transmitter is disposed on the pad block, and the optical receiver is disposed on the first substrate, and the method includes: acquiring a calibration electric signal, wherein the calibration electric signal is obtained by calibrating the light emitter and the light detector in each flight time module, and the calibration electric signal is prestored in a memory of the flight time module; controlling the optical transmitter to transmit an optical signal and controlling the optical receiver to receive the reflected optical signal transmitted by the optical transmitter; controlling the optical detector to convert the optical signal received by the optical receiver into a detection electrical signal; and controlling the working parameters of the light emitter according to the detection electric signal and the calibration electric signal.
An embodiment of the present invention provides a controller for a time-of-flight module, where the time-of-flight module includes a first substrate assembly, a pad block, an optical receiver, an optical transmitter, and an optical detector, the first substrate assembly includes a first substrate, the pad block is disposed on the first substrate, the optical transmitter is disposed on the pad block, the optical receiver is disposed on the first substrate, and the controller is configured to: acquiring a calibration electric signal, wherein the calibration electric signal is obtained by calibrating the light emitter and the light detector in each flight time module, and the calibration electric signal is prestored in a memory of the flight time module; controlling the optical transmitter to transmit an optical signal and controlling the optical receiver to receive the reflected optical signal transmitted by the optical transmitter; controlling the optical detector to convert the optical signal received by the optical receiver into a detection electrical signal; and controlling the working parameters of the light emitter according to the detection electric signal and the calibration electric signal.
The embodiment of the invention provides a time-of-flight module, which comprises a light emitter, a light detector and the controller of the embodiment, wherein the light emitter is used for emitting a light signal; the optical detector is used for converting the received optical signal into a detection electric signal.
The embodiment of the invention provides an electronic device which comprises a machine shell and the time-of-flight module, wherein the time-of-flight module is arranged on the machine shell.
According to the control method of the time-of-flight module, the controller of the time-of-flight module, the time-of-flight module and the electronic device, the working parameters of the light emitter are controlled according to the difference between the detection electric signal and the calibration electric signal obtained by converting the light signal emitted by the light emitter, so that the light power output by the light emitter is calibrated, the precision of the depth information acquired by the time-of-flight module is ensured, the light emitter is arranged on the cushion block, the light receiver is arranged on the first substrate, the height of the light emitter is increased through the cushion block, the light signal emitted by the light emitter is prevented from being shielded by the light receiver, and the detection precision of the time-of-flight module is improved.
Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow chart of a method for controlling a time of flight module according to some embodiments of the present invention;
FIG. 2 is a block diagram of a time of flight module in accordance with certain embodiments of the present invention;
FIG. 3 is a schematic diagram of the structure of the light source of the light emitter of the time-of-flight module according to some embodiments of the present invention;
FIGS. 4-9 are schematic flow charts illustrating a method for controlling a time of flight module according to some embodiments of the present invention;
FIG. 10 is a perspective view of an electronic device according to some embodiments of the present invention in one state;
FIG. 11 is a schematic perspective view of another state of an electronic device according to some embodiments of the present invention;
FIG. 12 is a schematic perspective view of a time-of-flight module according to some embodiments of the present invention;
FIG. 13 is a schematic top view of a time of flight module according to certain embodiments of the invention;
FIG. 14 is a schematic bottom view of a time of flight module according to some embodiments of the invention;
FIG. 15 is a schematic side view of a time of flight module according to certain embodiments of the invention;
FIG. 16 is a schematic cross-sectional view of the time of flight module shown in FIG. 13, taken along line XVI;
FIG. 17 is an enlarged schematic view of a portion XVII of the time of flight module shown in FIG. 16;
FIG. 18 is a schematic front view of a time-of-flight module according to some embodiments of the present invention when the flexible circuit board is not bent;
fig. 19-22 are schematic structural diagrams of light emitters according to some embodiments of the invention.
Detailed Description
The following description will further explain embodiments of the present invention with reference to the drawings. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality throughout. The embodiments of the present invention described below in conjunction with the accompanying drawings are illustrative and are only for the purpose of explaining the embodiments of the present invention, and are not to be construed as limiting the present invention.
Referring to fig. 1 and 2, a method for controlling a time-of-flight module 20 is provided according to an embodiment of the present invention. Time-of-flight module 20 includes an optical emitter 23 and an optical detector 27. The control method comprises the following steps:
01: acquiring a calibration electrical signal;
02: controlling the optical transmitter 23 to transmit an optical signal;
03: controlling the photodetector 27 to convert the received optical signal into a detection electrical signal; and
04: and controlling the working parameters of the light emitter 23 according to the detection electric signal and the calibration electric signal.
Referring to FIG. 2, an embodiment of the present invention provides a controller 28 of the time of flight module 20. Time-of-flight module 20 includes an optical emitter 23 and an optical detector 27. The method for controlling the time-of-flight module 20 according to the embodiment of the present invention can be implemented by the controller 28 of the time-of-flight module 20 according to the embodiment of the present invention. For example, the controller 28 may be used to perform the methods in 01, 02, 03, and 04. That is, the controller 28 may be configured to: acquiring a calibration electrical signal; controlling the optical transmitter 23 to transmit an optical signal; controlling the photodetector 27 to convert the received optical signal into a detection electrical signal; and controlling the operating parameters of the light emitter 23 according to the detection electrical signal and the calibration electrical signal.
According to the method for controlling the time-of-flight module 20 and the controller 28 of the time-of-flight module 20 of the embodiment of the present invention, the working parameter of the light emitter 23 is adjusted according to the difference between the detection electrical signal and the calibration electrical signal obtained by converting the optical signal emitted by the light emitter 23, so that the optical power output by the light emitter 23 is calibrated, and the accuracy of the depth information acquired by the time-of-flight module 20 is ensured.
Specifically, the optical transmitter 23 may be a Vertical Cavity Surface Emitting Laser (VCSEL). The Photo detectors 27 may be Photodiodes (PDs) or other elements capable of converting optical signals into electrical signals, and the number of the Photo detectors 27 may be one or more.
The photodetector 27 is used for converting the received optical signal into a detection electrical signal. The optical signal received by the optical detector 27 may be an optical signal directly emitted by the optical emitter 23, or an optical signal that is emitted by the optical emitter 23 and then reaches the optical detector 27 after being reflected or refracted. The photodetector 27 converts the received optical signal into a detection electrical signal, which may be a current signal or a voltage signal.
The calibration electrical signal is the expected value of the detection electrical signal. That is, the controller 28 adjusts the operating parameters of the optical transmitter 23 according to the difference between the detected electrical signal and the calibration electrical signal, so that the detected electrical signal converted by the optical detector 27 according to the received optical signal is eventually equal to or close to the calibration electrical signal. Controller 28 may obtain the calibration electrical signal before controlling light emitter 23 to emit the optical signal; or obtaining a calibration electrical signal before controlling the photodetector 27 to convert the received optical signal into a detection electrical signal; or obtain the calibration electrical signal before controlling the operating parameters of the optical transmitter 23 according to the detection electrical signal and the calibration electrical signal, which is not limited herein.
Based on the detected electrical signal and the calibrated electrical signal, controller 28 controls an operating parameter of light emitter 23, which may be an operating current, an operating voltage, an operating power, a number of light emitting elements 62 that light source 60 of light emitter 23 turns on (as shown in fig. 3 and 19), and so on. Controlling the operating parameters of light emitter 23 may be increasing the operating parameters of light emitter 23, decreasing the operating parameters of light emitter 23, or keeping the operating parameters of light emitter 23 constant.
Referring to fig. 2 and 4, in some embodiments, the step of obtaining a calibration electrical signal (i.e. 01) includes:
011: controlling the optical transmitters 23 of the plurality of time-of-flight modules 20 to transmit optical signals;
012: controlling the photodetectors 27 of the plurality of time-of-flight modules 20 to convert the received optical signals emitted by the optical emitters 23 of the corresponding time-of-flight modules 20 into a plurality of reference electrical signals, respectively; and
013: a calibration electrical signal is calculated from the plurality of reference electrical signals.
Referring to fig. 2, in some embodiments, controller 28 may be configured to perform the methods of 011, 012, and 013. That is, the controller 28 may also be used to: controlling the optical transmitters 23 of the plurality of time-of-flight modules 20 to transmit optical signals; controlling the photodetectors 27 of the plurality of time-of-flight modules 20 to convert the received optical signals emitted by the optical emitters 23 of the corresponding time-of-flight modules 20 into a plurality of reference electrical signals, respectively; and calculating a calibration electrical signal from the plurality of reference electrical signals.
Specifically, in the process of acquiring the calibration electrical signal, the controller 28 may control the optical emitters 23 of the plurality of time-of-flight modules 20 to sequentially emit optical signals, and then control the optical detectors 27 of the plurality of time-of-flight modules 20 to sequentially convert the received corresponding optical signals into a plurality of reference electrical signals. After obtaining the plurality of reference electrical signals, the controller 28 may calculate a calibration electrical signal according to an average value of the plurality of reference electrical signals; or calculating a calibration electrical signal according to the median of the plurality of reference electrical signals; or calculating a calibration electrical signal from the mode of the plurality of reference electrical signals, and the like.
Taking the plurality of time-of-flight modules 20 including the first time-of-flight module, the second time-of-flight module, the third time-of-flight module and the fourth time-of-flight module as an example, the time-of-flight module 20 that needs to control the operating parameters of the optical transmitter 23 according to the embodiment of the present invention may be any one of the first time-of-flight module, the second time-of-flight module, the third time-of-flight module and the fourth time-of-flight module, or may not belong to any one of the first time-of-flight module, the second time-of-flight module, the third time-of-flight module and the fourth time-of-flight module. The first time-of-flight module comprises a first optical emitter and a first optical detector, the second time-of-flight module comprises a second optical emitter and a second optical detector, the third time-of-flight module comprises a third optical emitter and a third optical detector, and the fourth time-of-flight module comprises a fourth optical emitter and a fourth optical detector. The controller 28 first controls the first optical transmitter to transmit an optical signal, and then the first optical detector converts the optical signal transmitted by the first optical transmitter into a first reference electrical signal. The controller 28 then controls the second optical transmitter to transmit an optical signal, and the second optical detector then converts the optical signal transmitted by the second optical transmitter into a second reference electrical signal. The controller 28 then controls the third optical transmitter to transmit an optical signal, and the third optical detector then converts the optical signal transmitted by the third optical transmitter into a third reference electrical signal. The controller 28 finally controls the fourth optical transmitter to transmit an optical signal, and the fourth optical detector converts the optical signal transmitted by the fourth optical transmitter into a fourth reference electrical signal. After obtaining the first reference electrical signal, the second reference electrical signal, the third reference electrical signal, and the fourth reference electrical signal, for example, the first reference electrical signal is 0.4mA, the second reference electrical signal is 0.3mA, the third reference electrical signal is 0.5mA, and the fourth reference electrical signal is 0.5mA. The controller 28 calculates the calibrated electrical signal to be 0.425mA according to the average value of 0.4mA, 0.3mA, 0.5mA and 0.5 mA; or the controller 28 calculates the calibrated electrical signal to be 0.45mA according to the median of 0.4mA, 0.3mA, 0.5mA and 0.5 mA; or the controller 28 calculates the calibrated electrical signal to be 0.5mA according to the mode of 0.4mA, 0.3mA, 0.5mA and 0.5mA.
In other embodiments, the plurality of time-of-flight modules 20 may also include another number (greater than or equal to two) of time-of-flight modules 20, and the controller 28 may also control the optical transmitters 23 of the plurality of time-of-flight modules 20 to emit optical signals at the same time to obtain the calibration electrical signal, and specifically, may adopt a light shielding device or other means so that the process of obtaining the reference electrical signal by the plurality of time-of-flight modules 20 does not affect each other. The controller 28 may also calculate the calibration electrical signal by other calculation methods according to the plurality of reference electrical signals, which is not limited herein.
In the embodiment of the present invention, the controller 28 obtains a unique calibration electrical signal according to calibration of the optical emitter 23 and the optical detector 27 in the multiple time-of-flight modules 20, and when any subsequent time-of-flight module 20 (which may be any one of the multiple time-of-flight modules 20 or any other time-of-flight module 20) needs to calibrate the optical power output by the optical emitter 23, the controller 28 may use the calibration electrical signal, so as to control the operating parameter of the optical emitter 23 according to the detection electrical signal and the calibration electrical signal, and ensure the accuracy of the depth information obtained by the time-of-flight module 20.
Referring to fig. 2 and 5, in some embodiments, the step of obtaining the calibration electrical signal (i.e. 01) includes:
014: controlling the optical transmitter 23 of each time-of-flight module 20 to transmit an optical signal; and
015: controlling the light detector 27 of each time-of-flight module 20 to convert the received light signal emitted by the light emitter 23 of the corresponding time-of-flight module 20 into an electrical signal as a calibration electrical signal;
the step of controlling (i.e. 04) the operating parameter of light emitter 23 based on the sensed electrical signal and the calibration electrical signal comprises:
041: and controlling the working parameters of the light emitter 23 according to the detection electric signal and the corresponding calibration electric signal.
Referring to FIG. 2, in some embodiments, controller 28 may be configured to perform methods of 014, 015, and 041. That is, the controller 28 may also be configured to: controlling the optical transmitter 23 of each time-of-flight module 20 to transmit an optical signal; controlling the light detector 27 of each time-of-flight module 20 to convert the received light signal emitted by the light emitter 23 of the corresponding time-of-flight module 20 into an electrical signal as a calibration electrical signal; and controlling the working parameters of the light emitter 23 according to the detection electric signal and the corresponding calibration electric signal.
Specifically, in acquiring the calibration electrical signal, the controller 28 may control the optical emitter 23 of each time-of-flight module 20 to emit an optical signal, and then control the optical detector 27 of each time-of-flight module 20 to convert the received corresponding optical signal into an electrical signal as the calibration electrical signal. That is, each time-of-flight module 20 can obtain a calibration electrical signal independently, and the calibration electrical signals of a plurality of time-of-flight modules 20 are not related to each other. Controller 28 controls the operating parameters of light emitter 23 based on the sensed electrical signal and the corresponding calibration electrical signal.
Still taking the example that the plurality of time-of-flight modules 20 includes a first time-of-flight module, a second time-of-flight module, a third time-of-flight module, and a fourth time-of-flight module as an example, the time-of-flight module 20 that needs to control the operating parameter of the optical transmitter 23 according to the embodiment of the present invention may be any one of the first time-of-flight module, the second time-of-flight module, the third time-of-flight module, and the fourth time-of-flight module. The first time-of-flight module includes a first optical emitter and a first optical detector, the second time-of-flight module includes a second optical emitter and a second optical detector, the third time-of-flight module includes a third optical emitter and a third optical detector, and the fourth time-of-flight module includes a fourth optical emitter and a fourth optical detector. The controller 28 first controls the first optical transmitter to transmit an optical signal, and then the first optical detector converts the optical signal transmitted by the first optical transmitter into an electrical signal as a first calibration electrical signal. The controller 28 then controls the second optical emitter to emit an optical signal, and the second optical detector then converts the optical signal emitted by the second optical emitter into an electrical signal as a second calibration electrical signal. The controller 28 controls the third optical transmitter to transmit the optical signal, and the third optical detector converts the optical signal transmitted by the third optical transmitter into an electrical signal as a third calibration electrical signal. The controller 28 finally controls the fourth optical transmitter to transmit an optical signal, and the fourth optical detector converts the optical signal transmitted by the fourth optical transmitter into an electrical signal as a fourth calibration electrical signal. For example, the first calibrated electrical signal is 0.4mA, the second calibrated electrical signal is 0.3mA, the third calibrated electrical signal is 0.5mA, and the fourth calibrated electrical signal is 0.5mA. The controller 28 further determines which time-of-flight module 20 the time-of-flight module 20 currently needs to control the working parameter of the light emitter 23 is, and if the time-of-flight module 20 currently needs to control the working parameter of the light emitter 23 is the first time-of-flight module, the controller 28 controls the working parameter of the light emitter 23 according to the detection electrical signal and the first calibration electrical signal, so that the detection electrical signal is finally equal to or approaches the first calibration electrical signal. When the time-of-flight module 20 currently needing to control the working parameters of the optical transmitter 23 is the second time-of-flight module, the third time-of-flight module, and the fourth time-of-flight module, the controller 28 correspondingly controls the working parameters of the optical transmitter 23 according to the detected electrical signal and the second calibration electrical signal, the third calibration electrical signal, or the fourth calibration electrical signal, which will not be described in detail herein.
In the embodiment of the present invention, the controller 28 calibrates each time-of-flight module 20, and when each subsequent time-of-flight module 20 needs to calibrate the optical power output by the optical transmitter 23, the controller 28 uses a calibration electrical signal corresponding to the time-of-flight module 20 or the optical detector 27, so as to control the working parameters of the optical transmitter 23 according to the detection electrical signal and the calibration electrical signal, and ensure the accuracy of the depth information acquired by the time-of-flight module 20.
In addition, since each time-of-flight module 20 or photodetector 27 corresponds to a calibration electrical signal, the selectivity of the setting position and the placing angle of the photodetector 27 and the reflectivity of the diffuser 80 (shown in fig. 19) of the light emitter 23 is higher, and it is only necessary to satisfy the above-mentioned factors that the optical power output by the light emitter 23 is substantially consistent with the optical power output by the light emitter 23 during the process of obtaining the calibration electrical signal.
Referring to fig. 2 and 6, in some embodiments, the step of obtaining the calibration electrical signal (i.e. 01) includes:
016: directly reading calibration electrical signals prestored in the time-of-flight modules 20, wherein the calibration electrical signals are obtained by calibrating the light emitter 23 and the light detector 27 in each time-of-flight module 20; alternatively, the calibration electrical signals are calibrated based on optical emitters 23 and optical detectors 27 in the plurality of time-of-flight modules 20.
Referring to fig. 2, in some embodiments, the controller 28 may be configured to perform the method of 016. That is, controller 28 may be configured to directly read calibration electrical signals pre-stored in time-of-flight modules 20, the calibration electrical signals being calibrated according to light emitter 23 and light detector 27 in each time-of-flight module 20; alternatively, the calibration electrical signals are calibrated based on optical emitters 23 and optical detectors 27 in the plurality of time-of-flight modules 20.
Specifically, after calibrating the calibration electrical signals according to the optical emitter 23 and the optical detector 27 in each time-of-flight module 20 (for example, using the method in 014 and 015), or calibrating the calibration electrical signals according to the optical emitter 23 and the optical detector 27 in a plurality of time-of-flight modules 20 (for example, using the methods in 011, 012, and 013), the controller 28 may store the calibration electrical signals in a memory 29 (shown in fig. 2) of the time-of-flight module 20, where the memory 29 may be an (Electrically Erasable Programmable read only memory, EEPROM), or a charged Erasable Programmable read only memory.
In the embodiment of the present invention, the calibration electrical signal is pre-stored in the time-of-flight module 20 (generally, the time-of-flight module 20 is pre-stored in the time-of-flight module 20 before the time-of-flight module 20 leaves the factory), and when the controller 28 needs to control the working parameter of the light emitter 23 according to the detection electrical signal and the calibration electrical signal, the controller 28 reads the corresponding calibration electrical signal from the memory 29 of the time-of-flight module 20, which is more convenient.
Referring to fig. 2, 3 and 7, in some embodiments, the light emitter 23 includes a light source 60. The step of controlling (i.e. 04) the operating parameter of light emitter 23 based on the sensed electrical signal and the calibration electrical signal comprises:
042: and controlling the working current of the light source 60 according to the detection electric signal and the calibration electric signal.
Referring to fig. 2 and 3, in some embodiments, light emitter 23 includes a light source 60. Controller 28 may be used to execute the method in 042. That is, the controller 28 may be configured to control the operating current of the light source 60 according to the detection electrical signal and the calibration electrical signal.
Specifically, the controller 28 may control the working current of the light source 60 according to the difference between the detection electrical signal and the calibration electrical signal, so as to adjust the optical power output by the light emitter 23, achieve calibration of the optical power output by the light emitter 23, and ensure the accuracy of the depth information acquired by the time-of-flight module 20.
Referring to fig. 2, 3 and 8, in some embodiments, the detection electrical signal and the calibration electrical signal are both current signals. The step of controlling the operating current of the light source 60 according to the detection electrical signal and the calibration electrical signal (i.e., 042) includes:
0422: when the detected electrical signal is greater than the calibrated electrical signal, the operating current of the light source 60 is reduced; and
0424: when the detected electrical signal is less than the calibration electrical signal, the operating current of the light source 60 is increased.
Referring to fig. 2 and 3, in some embodiments, the detection electrical signal and the calibration electrical signal are both current signals. Controller 28 may be used to execute the methods in 0422 and 0424. That is, the controller 28 may be configured to: when the detected electrical signal is greater than the calibrated electrical signal, reducing the operating current of the light source 60; and increasing the operating current of the light source 60 when the detected electrical signal is less than the calibration electrical signal.
Specifically, in general, the larger the operating current of the light source 60, the larger the optical power output by the optical emitter 23, and when the detection electrical signal is a current signal, the larger the detection electrical signal converted by the optical detector 27 according to the received optical signal. Therefore, when the detection electrical signal is greater than the calibration electrical signal, it indicates that the detection electrical signal is greater, that is, the optical power output by the optical transmitter 23 is greater, and therefore the operating current of the light source 60 needs to be reduced to reduce the optical power output by the optical transmitter 23, so as to ensure the accuracy of the depth information obtained by the time-of-flight module 20. Similarly, when the detection electrical signal is smaller than the calibration electrical signal, it indicates that the detection electrical signal is smaller, that is, the optical power output by the optical transmitter 23 is smaller, so that the working current of the light source 60 needs to be increased to increase the optical power output by the optical transmitter 23, thereby ensuring the accuracy of the depth information acquired by the time-of-flight module 20. It can be understood that when the detection electrical signal is equal to the calibration electrical signal, the detection electrical signal meets the expected value, and the controller 28 does not need to adjust the operating current of the light source 60, or the controller 28 controls the operating current of the light source 60 to be constant, so as to keep the current optical power output by the optical transmitter 23 and ensure the accuracy of the depth information obtained by the time-of-flight module 20.
In other embodiments, the controller 28 may also decrease the operating current of the light source 60 when the detected electrical signal is greater than the first calibrated threshold; when the detected electrical signal is less than the second calibration threshold, increasing the working current of the light source 60; when the detected electrical signal is greater than or equal to the second calibration threshold value and less than or equal to the first calibration threshold value, the operating current of the light source 60 is kept unchanged. The first calibration threshold value is larger than the calibration electric signal, and the second calibration threshold value is smaller than the calibration electric signal.
Taking the calibration electrical signal equal to 0.4mA as an example, the first calibration threshold may be 0.41mA and the second calibration threshold may be 0.39mA. When the detection electrical signal is greater than or equal to 0.39mA and less than or equal to 0.41mA, the controller 28 keeps the working current of the light source 60 unchanged, so as to avoid that the working current of the light source 60 is frequently adjusted by the controller 28 to interfere with the working of the time-of-flight module 20 and increase the complexity of the control logic of the time-of-flight module 20 due to slight change or error of the detection electrical signal.
Referring to fig. 2, 3 and 9, in some embodiments, the light emitter 23 includes a light source 60, and the light source 60 includes a plurality of light emitting elements 62. The step of controlling (i.e. 04) the operating parameter of light emitter 23 based on the sensed electrical signal and the calibration electrical signal comprises:
043: the number of the light-emitting elements 62 which are turned on by the light source 60 is controlled according to the detection electric signal and the calibration electric signal.
Referring to fig. 2 and 3, in some embodiments, the light emitter 23 includes a light source 60, and the light source 60 includes a plurality of light emitting elements 62. Controller 28 may be used to execute the method in 043. That is, the controller 28 can be used to control the number of light-emitting elements 62 that the light source 60 is turned on based on the detection electrical signal and the calibration electrical signal.
Specifically, the controller 28 may control the number of the light emitting elements 62 that the light source 60 is turned on according to the difference between the detection electrical signal and the calibration electrical signal, so as to adjust the optical power output by the light emitter 23, achieve calibration of the optical power output by the light emitter 23, and ensure accuracy of the depth information acquired by the time-of-flight module 20.
Taking the detecting electrical signal and the calibrating electrical signal as the current signal, the controller 28 may decrease the number of the light emitting elements 62 that are turned on by the light source 60 when the detecting electrical signal is greater than the calibrating electrical signal; when the detected electrical signal is smaller than the calibration electrical signal, increasing the number of the light-emitting elements 62 which are turned on by the light source 60; when the detected electrical signal is equal to the calibration electrical signal, the number of light emitting elements 62 that are turned on by the light source 60 is kept unchanged. Specifically, in general, the greater the number of light emitting elements 62 on which the light source 60 is turned on, the greater the optical power output by the light emitter 23, and the greater the detection electrical signal converted by the light detector 27 from the received optical signal when the detection electrical signal is a current signal. Therefore, when the detection electrical signal is greater than the calibration electrical signal, it indicates that the detection electrical signal is greater, that is, the optical power output by the optical transmitter 23 is greater, and therefore the number of the light emitting elements 62 that are turned on by the light source 60 needs to be reduced to reduce the optical power output by the optical transmitter 23, so as to ensure the accuracy of the depth information obtained by the time-of-flight module 20. Similarly, when the detection electrical signal is smaller than the calibration electrical signal, it indicates that the detection electrical signal is smaller, that is, the optical power output by the optical transmitter 23 is smaller, so that the number of the light emitting elements 62 that are turned on by the light source 60 needs to be increased to increase the optical power output by the optical transmitter 23, and the accuracy of the depth information acquired by the time-of-flight module 20 is ensured. It can be understood that when the detection electrical signal is equal to the calibration electrical signal, the detection electrical signal meets the desired value, and the controller 28 does not need to adjust the number of the light emitting elements 62 on which the light source 60 is turned on, or the number of the light emitting elements 62 on which the controller 28 controls the light source 60 to be turned on, so as to keep the current optical power output by the light emitter 23 and ensure the accuracy of the depth information acquired by the time-of-flight module 20.
In other embodiments, the controller 28 may also decrease the number of light emitting elements 62 that the light source 60 turns on when the detected electrical signal is greater than the first calibrated threshold; when the detection electric signal is smaller than the second calibration threshold value, increasing the number of the light-emitting elements 62 which are turned on by the light source 60; when the detected electrical signal is greater than or equal to the second calibrated threshold and less than or equal to the first calibrated threshold, the number of light-emitting elements 62 that the light source 60 is turned on is kept unchanged. The first calibration threshold value is larger than the calibration electric signal, and the second calibration threshold value is smaller than the calibration electric signal.
Taking the calibration electrical signal equal to 0.4mA as an example, the first calibration threshold may be 0.41mA and the second calibration threshold may be 0.39mA. When the detection electrical signal is greater than or equal to 0.39mA and less than or equal to 0.41mA, the controller 28 keeps the number of the light emitting elements 62 that the light source 60 is turned on unchanged, so as to avoid that the controller 28 frequently adjusts the number of the light emitting elements 62 that the light source 60 is turned on when there is a slight change or error in the detection electrical signal, which interferes with the operation of the time-of-flight module 20 and increases the complexity of the control logic of the time-of-flight module 20.
In some embodiments, the controller 28 may control the operating current of the light source 60 according to the detection electrical signal and the calibration electrical signal, and the controller 28 may control the number of the light emitting elements 62 that the light source 60 is turned on according to the detection electrical signal and the calibration electrical signal. When the difference between the detection electrical signal and the calibration electrical signal is large, for example, greater than a certain electrical signal threshold, the controller 28 controls the number of light-emitting elements 62 of the light source 60 to be turned on according to the detection electrical signal and the calibration electrical signal; when the difference between the detected electrical signal and the calibrated electrical signal is small, such as less than a certain electrical signal threshold, the controller 28 adjusts the operating current of the light source 60 according to the detected electrical signal and the calibrated electrical signal. It can be understood that when the difference between the detection electrical signal and the calibration electrical signal is large, it is fast and effective to directly adjust the number of the light emitting elements 62 turned on by the light source 60, and when the difference between the detection electrical signal and the calibration electrical signal is small, the operating current of the light source 60 is fine-tuned.
Referring to fig. 10 and 11, an electronic device 100 according to an embodiment of the invention includes a housing 10 and a time-of-flight module 20. The electronic device 100 may be a mobile phone, a tablet computer, a game machine, a smart watch, a head display device, an unmanned aerial vehicle, etc., and the embodiment of the present invention is described by taking the electronic device 100 as a mobile phone, it is understood that the specific form of the electronic device 100 is not limited to the mobile phone.
The housing 10 may serve as a mounting carrier for the functional elements of the electronic device 100, and the housing 10 may provide protection for the functional elements, such as the display 30, the visible light camera 40, the receiver 50, and the like, against dust, water, and falling. In the embodiment of the present invention, the housing 10 includes a main body 11 and a movable bracket 12, the movable bracket 12 can move relative to the main body 11 under the driving of the driving device, for example, the movable bracket 12 can slide relative to the main body 11 to slide into the main body 11 (as shown in fig. 10) or slide out of the main body 11 (as shown in fig. 11). Some functional elements (such as the display 30) may be mounted on the main body 11, and some other functional elements (such as the time-of-flight module 20, the visible light camera 40, and the receiver 50) may be mounted on the movable support 12, and the movement of the movable support 12 may cause the other functional elements to retract into the main body 11 or extend out of the main body 11.
The time of flight module 20 is mounted on the cabinet 10. Specifically, the casing 10 may be provided with an acquisition window, and the time-of-flight module 20 is aligned with the acquisition window so that the time-of-flight module 20 acquires depth information. In the embodiment of the present invention, the time-of-flight module 20 is mounted on the movable support 12, and when the user needs to use the time-of-flight module 20, the user can trigger the movable support 12 to slide out of the main body 11 to drive the time-of-flight module 20 to extend out of the main body 11, and when the user does not need to use the time-of-flight module 20, the user can trigger the movable support 12 to slide into the main body 11 to drive the time-of-flight module 20 to retract into the main body 11. Of course, fig. 10 and 11 are only examples of one specific form of the housing 10, and should not be construed as limiting the present invention to the housing 10, for example, in another example, the housing 10 may be provided with a fixed acquisition window, and the time-of-flight module 20 is fixedly disposed and aligned with the acquisition window; in yet another example, the time of flight module 20 is fixedly disposed below the display screen 30.
Referring to fig. 12-16, the time-of-flight module 20 includes a first substrate assembly 21, a spacer 22, a first optical device 23, a second optical device 24, a photodetector 27, and a controller 28. The first substrate assembly 21 includes a first substrate 211 and a flexible circuit board 212 connected to each other. The spacers 22 are disposed on the first substrate 211. The first optical device 23 is disposed on the spacer 22. The flexible circuit board 212 is bent, and one end of the flexible circuit board 212 is connected to the first substrate 211, and the other end is connected to the first optical device 23. The second optical device 24 is disposed on the first substrate 211, the second optical device 24 includes a housing 241 and an optical element 242 disposed on the housing 241, and the housing 241 is integrally connected to the spacer 22.
In the electronic device 100 according to the embodiment of the invention, since the first optical device 23 is disposed on the spacer 22, the spacer 22 can be higher than the first optical device 23, so that the height difference between the first optical device 23 and the second optical device 24 is reduced, and one of the first optical device 23 and the second optical device 24 (the first optical device 23 and the second optical device 24) is prevented from being blocked by the other when emitting or receiving an optical signal. When the first optical device 23 is the optical transmitter 23 and the second optical device 24 is the optical receiver 24, the optical signal emitted by the optical transmitter 23 is not easily blocked by the optical receiver 24, so that the optical signal can completely irradiate on the object to be measured; when the first optical device 23 is an optical receiver and the second optical device 24 is an optical transmitter, the external optical signal is not blocked by the optical transmitter before entering the optical receiver.
Because the light emitter 23 is arranged on the cushion block 22, the height of the light emitter 23 can be increased by the cushion block 22, so that the height of the emergent surface of the light emitter 23 is increased, and the light signal emitted by the light emitter 23 is not easily shielded by the light receiver 24, so that the light signal can be completely irradiated on the object to be measured.
The following description will be given by taking the first optical device 23 as the optical transmitter 23 and the second optical device 24 as the optical receiver 24. It is understood that in other embodiments, the first optical device 23 may be an optical receiver and the second optical device 24 may be an optical transmitter.
Specifically, the first substrate assembly 21 includes a first substrate 211 and a flexible circuit board 212. The first substrate 211 may be a printed circuit board or a flexible circuit board, and a control circuit of the time-of-flight module 20 may be laid on the first substrate 211. One end of the flexible circuit board 212 may be connected to the first substrate 211, and the flexible circuit board 212 may be bent at a certain angle, so that the relative positions of the devices connected to the two ends of the flexible circuit board 212 may be selected more.
Referring to fig. 12 and 16, the pads 22 are disposed on the first substrate 211. In one example, the pad 22 is in contact with the first substrate 211 and is carried on the first substrate 211, and specifically, the pad 22 may be bonded to the first substrate 211 by means of gluing or the like. The material of the spacer 22 may be metal, plastic, etc. In the embodiment of the present invention, a surface of the pad block 22 combined with the first substrate 211 may be a plane, and a surface of the pad block 22 opposite to the combined surface may also be a plane, so that the light emitter 23 has better stability when disposed on the pad block 22.
The light emitter 23 is used for emitting light signals outwards, specifically, the light signals may be infrared light, the light signals may be dot matrix light spots emitted to the object to be measured, and the light signals are emitted from the light emitter 23 at a certain divergence angle. The light emitter 23 is disposed on the pad 22, and in the embodiment of the present invention, the light emitter 23 is disposed on a side of the pad 22 opposite to the first substrate 211, or the pad 22 separates the first substrate 211 and the light emitter 23, so that a height difference is formed between the light emitter 23 and the first substrate 211. Light emitter 23 is further connected to flexible circuit board 212, flexible circuit board 212 is bent, one end of flexible circuit board 212 is connected to first substrate 211, and the other end is connected to light emitter 23, so as to transmit a control signal of light emitter 23 from first substrate 211 to light emitter 23, or transmit a feedback signal of light emitter 23 (for example, time information, frequency information of a light emitting signal of light emitter 23, temperature information of light emitter 23, etc.) to first substrate 211.
Referring to fig. 12, 13 and 15, the optical receiver 24 is used for receiving the reflected optical signal emitted by the optical transmitter 23. The light receiver 24 is disposed on the first substrate 211, and the contact surface of the light receiver 24 and the first substrate 211 is disposed substantially flush with the contact surface of the spacer 22 and the first substrate 211 (i.e., the mounting start points of the two are on the same plane). Specifically, the light receiver 24 includes a housing 241 and an optical element 242. The housing 241 is disposed on the first substrate 211, the optical element 242 is disposed on the housing 241, the housing 241 may be a lens holder and a lens barrel of the optical receiver 24, and the optical element 242 may be an element such as a lens disposed in the housing 241. Further, the optical receiver 24 may further include a light sensing chip (not shown), and a light signal reflected by the object to be measured is irradiated into the light sensing chip through the optical element 242, and the light sensing chip responds to the light signal. The time-of-flight module 20 calculates a time difference between the light signal emitted by the light emitter 23 and the light signal reflected by the object to be measured received by the light sensing chip, and further obtains depth information of the object to be measured, wherein the depth information can be used for distance measurement, depth image generation, three-dimensional modeling, and the like. In the embodiment of the present invention, the housing 241 is integrally connected to the head block 22. Specifically, the housing 241 and the pad 22 may be integrally formed, and the housing 241 and the pad 22 may be mounted on the first substrate 211 together, for example, the housing 241 and the pad 22 are made of the same material and integrally formed by injection molding, cutting, etc.; alternatively, the housing 241 and the pad 22 may be made of different materials and integrally formed by two-color injection molding. The housing 241 and the cushion block 22 may also be formed separately, and they form a matching structure, and when the time-of-flight module 20 is assembled, the housing 241 and the cushion block 22 may be connected into a whole and then disposed on the first substrate 211 together; one of the case 241 and the spacer 22 may be disposed on the first substrate 211, and the other may be disposed on the first substrate 211 and integrally connected.
In the electronic device 100 according to the embodiment of the present invention, since the optical transmitter 23 is disposed on the spacer 22, the spacer 22 can be higher than the optical transmitter 23, so as to increase the height of the emitting surface of the optical transmitter 23, and the optical signal emitted by the optical transmitter 23 is not easily shielded by the optical receiver 24, so that the optical signal can be completely irradiated onto the object to be measured. The exit surface of the light emitter 23 may be flush with the entrance surface of the light receiver 24, or the exit surface of the light emitter 23 may be slightly lower than the entrance surface of the light receiver 24, or the exit surface of the light emitter 23 may be slightly higher than the entrance surface of the light receiver 24.
Referring to fig. 14 and 16, in some embodiments, the first substrate assembly 21 further includes a reinforcing plate 213, and the reinforcing plate 213 is combined on a side of the first substrate 211 opposite to the pad 22. The reinforcing plate 213 may cover one side surface of the first substrate 211, and the reinforcing plate 213 may be used to increase the strength of the first substrate 211 and prevent the first substrate 211 from being deformed. In addition, the reinforcing plate 213 may be made of a conductive material, such as a metal or an alloy, and when the time of flight module 20 is mounted on the electronic device 100, the reinforcing plate 213 may be electrically connected to the chassis 10, so as to ground the reinforcing plate 213 and effectively reduce the interference of static electricity of external components on the time of flight module 20.
Referring to fig. 16 to 18, in some embodiments, the pad 22 includes a protrusion 225 protruding from a side edge 2111 of the first substrate 211, and the flexible circuit board 212 is bent around the protrusion 225. Specifically, a portion of the pad 22 is directly carried on the first substrate 211, and another portion is not in direct contact with the first substrate 211 and protrudes relative to the side edge 2111 of the first substrate 211 to form a protrusion 225. The flexible circuit board 212 may be connected to the side edge 2111, and the flexible circuit board 212 is bent around the protruding portion 225, or the flexible circuit board 212 is bent so that the protruding portion 225 is located in a space surrounded by the bending of the flexible circuit board 212, when the flexible circuit board 212 is subjected to an external force, the flexible circuit board 212 does not collapse inward to cause an excessive bending degree, which may damage the flexible circuit board 212.
Further, as shown in fig. 17, in some embodiments, the outer side 2251 of the protrusion 225 is a smooth curved surface (e.g., a cylindrical outer side), that is, the outer side 2251 of the protrusion 225 does not have a sudden curvature, so that even if the flexible circuit board 212 bends along the outer side 2251 of the protrusion 225, the bending degree of the flexible circuit board 212 is not too large, thereby further ensuring the integrity of the flexible circuit board 212.
Referring to fig. 3-14, in some embodiments, the time-of-flight module 20 further includes a connector 26, and the connector 26 is connected to the first substrate 211. The connector 26 is used to connect the first board assembly 21 and an external device. The connector 26 and the flexible circuit board 212 are respectively connected to opposite ends of the first substrate 211. The connector 26 may be a connecting socket or a connecting head, and when the time-of-flight module 20 is installed in the casing 10, the connector 26 may be connected to a motherboard of the electronic device 100, so that the time-of-flight module 20 is electrically connected to the motherboard. The connectors 26 and the flexible circuit board 212 are respectively connected to opposite ends of the first substrate 211, for example, the connectors may be respectively connected to the left and right ends of the first substrate 211, or respectively connected to the front and rear ends of the first substrate 211.
Referring to fig. 13 and 14, in some embodiments, the optical transmitter 23 and the optical receiver 24 are arranged along a straight line L, and the connector 26 and the flexible circuit board 212 are respectively located on two opposite sides of the straight line L. It will be appreciated that the time-of-flight module 20 may already be relatively large in size in the direction of line L due to the arrangement of the optical transmitter 23 and the optical receiver 24. The connectors 26 and the flexible circuit board 212 are respectively disposed on two opposite sides of the straight line L, so as not to increase the size of the time-of-flight module 20 along the direction of the straight line L, and thus, the time-of-flight module 20 is convenient to be mounted on the chassis 10 of the electronic device 100.
Referring to fig. 16 and 17, in some embodiments, a receiving cavity 223 is formed at a side of the pad 22 combined with the first substrate 211. The time of flight module 20 further includes an electronic component 25 disposed on the first substrate 211, and the electronic component 25 is received in the receiving cavity 223. The electronic component 25 may be a capacitor, an inductor, a transistor, a resistor, or the like, and the electronic component 25 may be electrically connected to a control line laid on the first substrate 211 and used to drive or control the operation of the optical transmitter 23 or the optical receiver 24. The electronic component 25 is accommodated in the accommodating cavity 223, so that the space in the cushion block 22 is reasonably utilized, the electronic component 25 is arranged without increasing the width of the first substrate 211, and the whole size of the time-of-flight module 20 is favorably reduced. The number of the receiving cavities 223 may be one or more, and the plurality of receiving cavities 223 may be spaced apart from each other, and when the spacer 22 is mounted, the receiving cavities 223 may be aligned with the positions of the electronic components 25 and the spacer 22 may be disposed on the first substrate 211.
Referring to fig. 16 and 18, in some embodiments, the spacer 22 is provided with a through-hole 224 communicating with the at least one receiving cavity 223, and the at least one electronic component 25 extends into the through-hole 224. It is understood that when the electronic component 25 needs to be accommodated in the accommodating cavity 223, the height of the electronic component 25 is required to be not higher than the height of the accommodating cavity 223. For the electronic component 25 higher than the accommodating cavity 223, a bypass through hole 224 corresponding to the accommodating cavity 223 may be formed, and the electronic component 25 may partially extend into the bypass through hole 224, so as to arrange the electronic component 25 without increasing the height of the cushion block 22.
Referring to fig. 16, in some embodiments, the light emitter 23 includes a second substrate assembly 231, a light source assembly 232, and a housing 233. The second substrate assembly 231 is disposed on the spacer 22, and the second substrate assembly 231 is connected to the flexible circuit board 212. The light source assembly 232, the light detector 27, and the controller 28 are disposed on the second substrate assembly 231, and the light source assembly 232 is used to emit a light signal. The housing 233 is disposed on the second substrate assembly 231, and the housing 233 forms an accommodating space 2331, and the accommodating space 2331 can be used to accommodate the light source assembly 232. The flexible circuit board 212 may be removably attached to the second substrate assembly 231. The light source assembly 232 is electrically connected to the second substrate assembly 231. The casing 233 may be bowl-shaped as a whole, and an opening of the casing 233 is covered downward on the second substrate assembly 231 to accommodate the light source assembly 232 in the accommodating space 2331. In the embodiment of the present invention, the housing 233 is provided with a light outlet 2332 corresponding to the light source module 232, a light signal emitted from the light source module 232 passes through the light outlet 2332 and then is emitted, and the light signal may directly pass through the light outlet 2332, or pass through the light outlet 2332 after changing the light path through other optical devices.
With continued reference to fig. 16, in some embodiments, the second substrate assembly 231 includes a second substrate 2311 and a stiffener 2312. The second substrate 2311 is connected to the flexible circuit board 212. The light source assembly 232 and the reinforcement member 2312 are disposed on opposite sides of the second substrate 2311. A specific type of the second substrate 2311 may be a printed wiring board, a flexible wiring board, or the like, and a control circuit may be laid on the second substrate 2311. The reinforcement 2312 may be fixedly connected to the second substrate 2311 by gluing, riveting, or the like, and the reinforcement 2312 may increase the overall strength of the second substrate assembly 231. When the light emitter 23 is disposed on the pad 22, the reinforcement 2312 may be in direct contact with the pad 22, the second substrate 2311 is not exposed to the outside and does not need to be in direct contact with the pad 22, and the second substrate 2311 is not easily contaminated by dust and the like.
In the embodiment shown in fig. 16, the stiffener 2312 is formed separately from the spacer 22. When assembling the time-of-flight module 20, the pads 22 may be mounted on the first substrate 211, and at this time, the two ends of the flexible circuit board 212 are connected to the first substrate 211 and the second substrate 2311, respectively, and the flexible circuit board 212 may not be bent first (as shown in fig. 18). The flexible circuit board 212 is then bent such that the reinforcement members 2312 are disposed on the spacers 22.
Of course, in other embodiments, the stiffener 2312 and the spacer 22 may be integrally formed, for example, by injection molding, and the spacer 22 and the light emitter 23 may be mounted on the first substrate 211 together when the time-of-flight module 20 is assembled.
Referring to fig. 18, in some embodiments, the stiffener 2312 is formed with a first locator 2313. The spacer 22 includes a body 221 and a second positioning member 222, and the second positioning member 222 is formed on the body 221. When the second substrate assembly 231 is disposed on the spacer 22, the first positioning member 2313 is engaged with the second positioning member 222. Specifically, the first positioning element 2313 and the second positioning element 222 cooperate to effectively limit the relative movement between the second substrate assembly 231 and the spacer 22. The specific types of the first positioning element 2313 and the second positioning element 222 can be selected according to the requirements, for example, the first positioning element 2313 is a positioning hole formed on the reinforcing element 2312, and the second positioning element 222 is a positioning column which extends into the positioning hole to enable the first positioning element 2313 and the second positioning element 222 to be matched with each other; or the first positioning element 2313 is a positioning column formed on the reinforcing element 2312, the second positioning element 222 is a positioning hole, and the positioning column extends into the positioning hole to enable the first positioning element 2313 and the second positioning element 222 to be matched with each other; or the number of the first positioning element 2313 and the second positioning element 222 is multiple, part of the first positioning element 2313 is a positioning hole, part of the second positioning element 222 is a positioning column, part of the first positioning element 2313 is a positioning column, part of the second positioning element 222 is a positioning hole, and the positioning column extends into the positioning hole so that the first positioning element 2313 and the second positioning element 222 are matched with each other.
The structure of the light source assembly 232 will be exemplified as follows:
referring to fig. 19, the light source assembly 232 includes a light source 60, a lens barrel 70, a diffuser 80 and a protective cover 90. The light source 60 is connected to the second substrate assembly 231, the lens barrel 70 includes a first surface 71 and a second surface 72 opposite to each other, the lens barrel 11 is provided with an accommodating cavity 75 penetrating through the first surface 71 and the second surface 72, and the first surface 71 is recessed toward the second surface 72 to form an installation groove 76 communicated with the accommodating cavity 75. The diffuser 80 is mounted in the mounting groove 76. The protective cover 90 is attached to the side of the first surface 71 of the lens barrel 70, and the diffuser 80 is interposed between the protective cover 90 and the bottom surface 77 of the mounting groove 76.
The protective cover 90 may be attached to the lens barrel 70 by a threaded, snap, or fastener connection. For example, referring to fig. 19, when the protection cover 90 includes a top wall 91 and protection side walls 92, the protection cover 90 (protection side walls 92) is provided with internal threads, and the lens barrel 70 is provided with external threads, at this time, the internal threads of the protection cover 90 are screwed with the external threads of the lens barrel 70 to mount the protection cover 90 on the lens barrel 70; or, referring to fig. 20, when the protection cover 90 includes the top wall 91, the protection cover 90 (the top wall 91) is provided with a locking hole 95, the end of the lens barrel 70 is provided with a hook 73, and when the protection cover 90 is disposed on the lens barrel 70, the hook 73 is inserted into the locking hole 95 so that the protection cover 90 is mounted on the lens barrel 70; or, referring to fig. 21, when the protection cover 90 includes the top wall 91 and the protection side wall 92, the protection cover 90 (the protection side wall 92) is provided with a locking hole 95, the lens barrel 70 is provided with a locking hook 73, and when the protection cover 90 is disposed on the lens barrel 70, the locking hook 73 is inserted into the locking hole 95 so that the protection cover 90 is mounted on the lens barrel 70; alternatively, referring to fig. 22, when the protection cover 90 includes a top wall 91, a first positioning hole 74 is formed at an end of the lens barrel 70, a second positioning hole 93 corresponding to the first positioning hole 74 is formed on the protection cover 90 (the top wall 91), and the fastener 94 passes through the second positioning hole 93 and is locked in the first positioning hole 74 to mount the protection cover 90 on the lens barrel 70. When the protective cover 90 is mounted on the lens barrel 70, the protective cover 90 abuts against the diffuser 80 and the diffuser 80 abuts against the bottom surface 77, so that the diffuser 80 is sandwiched between the protective cover 90 and the bottom surface 77.
The light source assembly 232 opens the installation groove 76 on the lens barrel 70, installs the diffuser 80 in the installation groove 76, and is installed on the lens barrel 70 through the protection cover 90 to clamp the diffuser 80 between the protection cover 90 and the bottom surface 77 of the installation groove 76, thereby fixing the diffuser 80 on the lens barrel 70. And the use of glue for fixing the diffuser 80 to the lens barrel 70 is avoided, so that the influence of the glue on the microstructure of the diffuser 80 due to the solidification of the glue on the surface of the diffuser 80 after volatilization can be avoided, and the phenomenon that the diffuser 80 falls off from the lens barrel 70 when the adhesive force of the glue for connecting the diffuser 80 and the lens barrel 70 is reduced due to aging can be avoided.
In the description of the specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature described. In the description of the present invention, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention, which is defined by the claims and their equivalents.

Claims (12)

1. A method of controlling a time-of-flight module, the time-of-flight module comprising a first substrate assembly, a pad, a light emitter, and a light detector, the first substrate assembly comprising a first substrate, the pad disposed on the first substrate, the light emitter disposed on the pad, the light receiver disposed on the first substrate to reduce a height differential that exists between the light emitter and the light receiver, a contact surface of the light receiver and the first substrate being flush with a contact surface of the pad and the first substrate, the method comprising:
acquiring a calibration electric signal, wherein the calibration electric signal is obtained by calibrating the light emitter and the light detector in each time-of-flight module, and the calibration electric signal is prestored in a memory of the time-of-flight module;
controlling the optical transmitter to transmit an optical signal and controlling the optical receiver to receive the reflected optical signal transmitted by the optical transmitter;
controlling the optical detector to convert the optical signal received by the optical receiver into a detection electrical signal; and
and controlling the working parameters of the light emitter according to the detection electric signal and the calibration electric signal.
2. Control method according to claim 1, characterized in that said step of acquiring a calibration electric signal comprises:
controlling the optical transmitter of each time-of-flight module to transmit the optical signal, and controlling the optical receiver of each time-of-flight module to receive the returned optical signal transmitted by the optical transmitter; and
controlling the optical detector of each time-of-flight module to convert the optical signal received by the optical receiver and transmitted by the optical transmitter of the corresponding time-of-flight module into an electrical signal to serve as the calibration electrical signal;
the step of controlling the working parameters of the light emitter according to the detection electrical signal and the calibration electrical signal comprises the following steps:
and controlling the working parameters of the light emitter according to the detection electric signal and the corresponding calibration electric signal.
3. The method of claim 1, wherein the light emitter comprises a light source, and the step of controlling the operating parameter of the light emitter according to the detection electrical signal and the calibration electrical signal comprises:
and controlling the working current of the light source according to the detection electric signal and the calibration electric signal.
4. The control method according to claim 3, wherein the detection electrical signal and the calibration electrical signal are both current signals, and the step of controlling the operating current of the light source according to the detection electrical signal and the calibration electrical signal comprises:
when the detection electric signal is larger than the calibration electric signal, reducing the working current of the light source; and
and when the detection electric signal is smaller than the calibration electric signal, increasing the working current of the light source.
5. The method of claim 1, wherein the light emitter comprises a light source including a plurality of light emitting elements, and the step of controlling the operating parameters of the light emitter according to the detection electrical signal and the calibration electrical signal comprises:
and controlling the number of the luminous elements for starting the light source according to the detection electric signal and the calibration electric signal.
6. A time of flight module controller, the time of flight module including a first substrate assembly, a spacer, a light receiver, a light emitter and a light detector, the first substrate assembly including a first substrate, the spacer being disposed on the first substrate, the light emitter being disposed on the spacer, the light receiver being disposed on the first substrate to reduce a height differential that exists between the light emitter and the light receiver, a contact surface of the light receiver and the first substrate being flush with a contact surface of the spacer and the first substrate, the controller being configured to:
acquiring a calibration electric signal, wherein the calibration electric signal is obtained by calibrating the light emitter and the light detector in each time-of-flight module, and the calibration electric signal is prestored in a memory of the time-of-flight module;
controlling the optical transmitter to transmit an optical signal and controlling the optical receiver to receive the reflected optical signal transmitted by the optical transmitter;
controlling the optical detector to convert the optical signal received by the optical receiver into a detection electrical signal; and
and controlling the working parameters of the light emitter according to the detection electric signal and the calibration electric signal.
7. The controller of claim 6, wherein the controller is further configured to:
controlling the optical transmitter of each time-of-flight module to transmit the optical signal, and controlling the optical receiver of each time-of-flight module to receive the returned optical signal transmitted by the optical transmitter;
controlling the optical detector of each time-of-flight module to convert the optical signal received by the optical receiver and transmitted by the optical transmitter of the corresponding time-of-flight module into an electrical signal to serve as the calibration electrical signal; and
and controlling the working parameters of the light emitter according to the detection electric signal and the corresponding calibration electric signal.
8. The controller of claim 6, wherein the light emitter comprises a light source, the controller further configured to:
and controlling the working current of the light source according to the detection electric signal and the calibration electric signal.
9. The controller of claim 8, wherein the detection electrical signal and the calibration electrical signal are both current signals, the controller further configured to:
when the detection electric signal is larger than the calibration electric signal, reducing the working current of the light source; and
and when the detection electric signal is smaller than the calibration electric signal, increasing the working current of the light source.
10. The controller of claim 6, wherein the light emitter comprises a light source comprising a plurality of light emitting elements, the controller further configured to:
and controlling the number of the light-emitting elements which are started by the light source according to the detection electric signal and the calibration electric signal.
11. A time of flight module, the time of flight module comprising:
an optical transmitter for transmitting an optical signal;
a photodetector for converting the received optical signal into a detected electrical signal; and
the controller of any one of claims 6-10.
12. An electronic device, comprising:
a housing; and
the time of flight module of claim 11, disposed on the housing.
CN202010144211.8A 2018-08-22 2018-08-22 Time-of-flight module, control method thereof, controller and electronic device Active CN111352094B (en)

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