CN215116808U - Depth camera safety monitoring system, TOF depth camera and electronic equipment - Google Patents
Depth camera safety monitoring system, TOF depth camera and electronic equipment Download PDFInfo
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- CN215116808U CN215116808U CN202120686187.0U CN202120686187U CN215116808U CN 215116808 U CN215116808 U CN 215116808U CN 202120686187 U CN202120686187 U CN 202120686187U CN 215116808 U CN215116808 U CN 215116808U
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Abstract
The utility model discloses a depth camera safety monitoring system, a TOF depth camera and an electronic device, which comprises a photosensitive diode, a driving chip, a timer circuit and a processing circuit; wherein the photodiode is disposed near a light source of the depth camera and is connected to the driver chip and the timer circuit, respectively; the driving chip is connected with a light source of the depth camera and used for controlling the light source to emit light beams outwards; the input of the timer circuit is connected with the photosensitive diode, and the output of the timer circuit is connected with the driving chip. The utility model discloses when can ensure that the transmitter of degree of depth camera takes place unusually, in time close the light source to the laser of light source outgoing causes the injury to people's eye when avoiding the transmitter to take place unusually.
Description
Technical Field
The utility model relates to an optics and electron technical field especially relate to a degree of depth camera safety monitoring system, TOF degree of depth camera and electronic equipment.
Background
With the development and application of AI artificial intelligence and 3D technology, 3D imaging technology is beginning to be popularized vigorously, and in 3D imaging technology, a scheme based on a Time of Flight (TOF) principle is beginning to receive more and more attention. A distance measurement may be performed on a target using time-of-flight principles to obtain depth image information containing depth values of the target.
Currently, a distance measuring system based on the time-of-flight principle is widely applied to various fields such as consumer electronics, unmanned driving, AR/VR and the like. For example: functions such as 3D sensing, face recognition and the like can be realized by integrating a TOF depth camera on the terminal equipment.
In general, a TOF depth camera generally includes a transmitting module and a receiving module, the transmitting module transmits a modulated pulse beam to a target field of view, the pulse beam is reflected back to the receiving module after encountering an object and is received by the receiving module, and the receiving module receives the reflected pulse beam and calculates a distance between the object and the receiving module according to a round trip time of the pulse beam, so as to obtain depth information. Wherein, the emission module adopts laser source transmission laser beam, and laser source is powerful laser instrument usually, and when the emission module had unusually, the laser of outgoing caused the injury to the human eye easily.
The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions created by the present invention, and it does not necessarily belong to the prior art of the present patent application, and it should not be used for evaluating the novelty and inventive step of the present application without explicit evidence that the above contents are disclosed at the filing date of the present patent application.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art not enough, provide a degree of depth camera safety monitoring system, TOF degree of depth camera and electronic equipment to solve at least one among the above-mentioned background art problem.
In order to achieve the above object, the embodiment of the present invention provides a technical solution that:
a depth camera safety monitoring system comprises a photosensitive diode, a driving chip, a timer circuit and a processing circuit; wherein the photodiode is disposed near a light source of the depth camera and is connected to the driver chip and the timer circuit, respectively; the driving chip is connected with a light source of the depth camera and used for controlling the light source to emit light beams outwards; the input of the timer circuit is connected with the photosensitive diode, and the output of the timer circuit is connected with the driving chip.
In some embodiments, the photodiode is disposed on a substrate on which the light source is mounted, for monitoring the light signal intensity of the light beam emitted by the light source, and outputting to the driving chip.
In some embodiments, the driving chip includes a power supply to supply power to the light source.
In some embodiments, the driving chip includes a temperature sensor for monitoring a temperature of the light source.
In some embodiments, a transparent conductive film is further included, the transparent conductive film being disposed on a surface of the diffractive optical element of the depth camera.
The utility model discloses another embodiment technical scheme does:
a TOF depth camera comprising a transmitter, a collector, and a processing circuit; wherein the emitter comprises a light source consisting of one or more lasers, a photodiode disposed adjacent to the light source, a diffractive optical element, and a driver chip; the collector comprises a TOF image sensor, a filtering unit and a receiving optical element; the processing circuit comprises a timer circuit, wherein the input of the timer circuit is connected with the photosensitive diode, and the output of the timer circuit is connected with the driving chip.
In some embodiments, the photodiode is disposed on a substrate on which the light source is mounted to monitor an optical signal intensity of a light beam emitted from the light source and output to the driving chip.
In some embodiments, a surface of the diffractive optical element is provided with a transparent conductive film for monitoring whether an abnormality occurs in the diffractive optical element.
In some embodiments, the transparent conductive film is connected to the driving chip or the processing circuit through a metal wire, and the driving chip or the processing circuit monitors a resistance value or a capacitance value of the transparent conductive film in real time to determine whether the transparent conductive film is damaged.
The utility model discloses another embodiment technical scheme does:
an electronic device comprises a memory, a processor and the depth camera safety monitoring system of any one of the embodiments.
The utility model discloses technical scheme's beneficial effect is:
compared with the prior art, the utility model discloses when can ensure that the transmitter of degree of depth camera takes place unusually, in time close the light source to the laser of light source outgoing causes the injury to people's eye when avoiding the transmitter to take place unusually.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a TOF depth camera according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a TOF depth camera according to an embodiment of the invention;
fig. 3 is a schematic diagram of a depth camera safety monitoring system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
It will be further understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner" and "outer" refer to an orientation or positional relationship as shown in the drawings, which are used for convenience in describing and simplifying the invention, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting of the invention.
Referring to fig. 1-3, for convenience of understanding, an embodiment of a TOF depth camera is described first, where fig. 1 is a schematic diagram of a TOF depth camera according to an embodiment of the present invention, and the TOF depth camera includes a transmitter 11, a collector 12, and a processing circuit 13; wherein, the transmitter 11 is used for transmitting an infrared laser signal 30 with phase information to a target field of view; collector 12 collects optical signals 40 reflected back through the target field of view; the processing circuit 13 is configured to calculate a phase difference between the emitted light signal and the reflected light signal, and acquire depth information based on the phase difference. Emitter 11 and collector 12 are disposed on a substrate, and specifically, may be disposed on the same substrate, or may be disposed on different substrates.
Specifically, the transmitter 11 includes a light source 111 composed of one or more lasers, a photodiode 110 disposed near the light source, a Diffractive Optical Element (DOE)112, and a driving chip 113. The light source 111 may be a light source such as a Light Emitting Diode (LED), an Edge Emitting Laser (EEL), a Vertical Cavity Surface Emitting Laser (VCSEL), or a VCSEL array light source chip formed by generating a plurality of VCSEL light sources on a single semiconductor substrate, and the light beam emitted by the light source 111 may be visible light, infrared light, ultraviolet light, or the like. A driving chip 113 (which may be further controlled by the processing circuit) for controlling the light source to emit a light beam outwards; the diffractive optical element 112 is configured to receive the light beam emitted by the light source and reproduce the light beam to form an illumination spot projected onto a target scene; the photodiode 110 is used for monitoring the intensity of the optical signal emitted by the light source and outputting the optical signal to the driving chip 113; wherein, the light beam emitted by the light source 111 is incident to the light receiving surface of the photodiode 110, and the photodiode 110 converts the optical signal into an electrical signal; under the condition that the light source 111 normally works, the intensity of the light signal of the emitted light beam tends to a preset intensity value, the output of the photodiode 110 corresponds to an electric signal with a preset value, and when the output of the photodiode 110 is abnormal, the light beam emitted by the light source is judged to be abnormal.
In the embodiment of the present invention, the photodiode 110 is disposed on the substrate 114 for mounting the light source 111, and at least a part of the light beam emitted from the light source 111 is reflected back to the photodiode 110 through the diffractive optical element 112, so that whether the diffractive optical element 112 is abnormal or not can be further determined through the photodiode 110, when the diffractive optical element 112 is abnormal (e.g., the diffractive optical element is damaged or falls off), the light beam reflected back by the photodiode 110 decreases or even goes to zero, and the output electrical signal correspondingly decreases or even goes to zero. It should be noted that the photodiode 110 may also be disposed at other positions of the emitter 11, the number of the photodiodes 110 may be multiple, and the disposed positions of the multiple photodiodes may be the same or different, which is not limited in the embodiment of the present invention.
In some embodiments, the surface of the diffractive optical element 112 is provided with a transparent conductive film 115 for monitoring whether an abnormality occurs in the diffractive optical element 112; the transparent conductive film 115 is connected to the driving chip 113 through a metal wire, and the driving chip 113 compares and analyzes the resistance change of the transparent conductive film 115 to determine the integrity of the diffractive optical element 112. In some embodiments, the transparent conductive film 115 may also be directly connected to the processing circuit 13 through a metal wire. The driving chip 113 or the processing circuit 13 monitors the resistance value or the capacitance value of the transparent conductive film 115 in real time, compares the monitored resistance value or the monitored capacitance value with a preset safety threshold interval, determines whether the monitored resistance value or the monitored capacitance value is within the safety threshold interval, determines that the integrity of the transparent conductive film 115 is damaged if the monitored resistance value or the monitored capacitance value exceeds the safety threshold interval, that is, the diffractive optical element 112 may be broken and damaged, starts to control the light emitting state of the light source 111, turns off the light source 111, and ensures laser safety.
In general, the TOF image sensor 121 comprises at least one pixel, each pixel comprising at least one tap (tap) for storing and reading or draining the charge signal generated by incident photons under control of the respective electrode, for example 3 taps, for reading charge signal data.
The processing circuit 13 comprises a timer circuit 130, wherein an input of the timer circuit 130 is connected to the photodiode 110. Specifically, the input of the timer circuit 130 receives the electrical signal output by the photodiode 110, and determines whether the electrical signal satisfies the reset instruction, and if so, the light source 111 is kept to emit light; if an abnormality occurs, the timer circuit 130 will force the light source 111 to stop emitting light signals. For example, when the timer circuit 130 does not receive the electrical signal output by the photodiode 110 for more than the preset duration, the timer circuit 110 will forcibly regulate the power supply of the light source 111 to stop supplying power to the light source, thereby turning off the light source 111. Or, when the driving chip 113 is abnormal and the light source 111 continuously emits light due to the fact that the light source cannot be turned off, and the duration time of the high level signal output by the photodiode 110 exceeds the preset duration time, the timer circuit 130 forcibly regulates the power supply of the light source to stop supplying power to the light source 111, so as to turn off the light source 111. It should be noted that in some embodiments, the timer circuit 130 may also exist independently of the processing circuit 13, rather than as a part of the processing circuit 13.
It should be noted that, in some embodiments, the timer circuit may also be a watchdog chip, and the watchdog chip receives the output electrical signal of the photodiode, and determines whether the output electrical signal meets a watchdog reset instruction, that is, a "dog feeding instruction", and if there is a dog feeding, keeps the light source to emit light; if the abnormality occurs, the watchdog chip will force the light source to stop emitting light signals.
The processing circuit 13 may be a stand-alone dedicated circuit, such as a dedicated SOC chip, an FPGA chip, an ASIC chip, etc. including a CPU, a memory, a bus, etc., or may include a general-purpose processing circuit, such as a processing circuit in a terminal, which may be at least a part of the processing circuit when the depth camera is integrated into a smart terminal, such as a mobile phone, a television, a computer, etc. In some embodiments, the processing circuit 13 is configured to provide a modulation signal (emission signal) required when the light source emits the light beam, and the light source emits a pulse light beam to the object to be measured under the control of the modulation signal; in addition, the processing circuit 13 also supplies a demodulation signal (acquisition signal) of a tap in each pixel of the TOF image sensor 121, the tap acquiring, under the control of the demodulation signal, a charge signal generated by a light beam including a reflected pulse light beam reflected back by the object to be measured, and generally, there are some light beams such as background light, disturbance light, and the like in addition to the reflected pulse light beam reflected back by the object to be measured; the processing circuit 13 may also be configured to store and perform corresponding processing on raw data acquired by each tap in the image sensor, so as to obtain specific position information of the object to be measured.
As another embodiment of the present invention, there is provided a depth camera safety monitoring system, as shown in fig. 3, the safety monitoring system includes: a photodiode 110, a driving chip 113, a timer circuit 130, and a processing circuit 13; wherein the photodiode 110 is disposed near the light source 111 of the depth camera and connected to the driving chip 113 and the timer circuit 130, respectively; the driving chip 113 is connected with the light source 111 of the depth camera and used for controlling the light source 111 to emit light beams outwards; the timer circuit 130 has an input connected to the photodiode 110 and an output connected to the driver chip 113. It should be noted that, in fig. 3, the timer circuit 130 is integrated with the processing circuit 13 as a part of the processing circuit 13, but in some other embodiments, the timer circuit 130 may exist independently from the processing circuit 13 instead of being a part of the processing circuit 13.
Specifically, the photodiode 110 is disposed on a substrate 115 on which the light source 111 is mounted, for monitoring the intensity of the light signal emitted by the light source, and outputting the light signal to the driving chip 113; a light beam emitted by the light source 111 is incident on a light receiving surface of the photodiode 110, and an optical signal is converted into an electrical signal by the photodiode 110; under the condition that the light source normally works, the intensity of the light signal of the emitted light beam tends to a preset intensity value, the output of the photosensitive diode 110 corresponds to an electric signal with a preset value, and when the output of the photosensitive diode 110 is abnormal, the light beam emitted by the light source is judged to be abnormal.
The driving chip 113 regulates and controls the light source to emit a light signal with a certain frequency, in some embodiments, the driving chip 113 may also be disposed on the substrate 115 and connected to the light source 111, and the driving chip 113 may further include a power supply to supply power to the light source by inputting a working current, so that the light source 111 emits a light beam. In addition, the driving chip 113 is also configured with a laser safety monitoring mechanism by which functions such as a short circuit of a light source, an abnormality of emission power, an abnormality of automatic gain, and the like can be monitored. For example, when the pulse duration of the light source emitting a single pulse light beam exceeds a certain value, the driving chip 113 may recognize the emission abnormality and trigger the protection mechanism to turn off the light source. It will be appreciated that in some embodiments, control signals may also be sent to the driver chip 113 by the processing circuit 13 to modulate the light emission and the turn-off of the light source 111.
In one embodiment, the driving chip 113 further includes a temperature sensor (not shown). When the light source 111 emits light with too high power or continuously emits light signals, the eyes of people can be damaged due to the too high energy of the emitted light signals, the temperature of the laser light source is too high due to the continuous light emission of the laser light source, the service life of the device can be greatly shortened, therefore, the temperature sensor is arranged to monitor the temperature of the light source, and the light source is stopped to emit the light signals through the driving chip when the temperature is too high.
In some embodiments, the power supply is provided separately from the driving chip 113, and the processing circuit 13 is connected to the power supply and provides the light source 111 with an operating current when the driving chip 113 itself cannot operate normally, for example: the driving chip 113 is short-circuited to cause the light source to continuously emit light, at this time, the image sensor 121 of the depth camera can inquire whether the light source normally works through the communication interface, if the inquiry fails, the processing circuit 13 directly regulates and controls the power supply to stop supplying power, and the light source 111 is turned off to emit light.
In some embodiments, the light source emission light signal is monitored for safety by both the photodiode 110 and the timer circuit 130. Specifically, the output end of the photodiode 110 is connected to the timer circuit 130 and the driving chip 113, when receiving the emission instruction, the processing circuit 13 regulates and controls the timer circuit 130 to start and regulates and controls the driving chip 113 to drive the light source 111 to emit the light signal, the photodiode 110 receives the light signal and outputs the electrical signal, the driving chip 113 and the timer circuit 130 perform safety monitoring on the light signal emitted by the light source according to the electrical signal, and if the light signal does not meet the preset condition, the light source 111 is regulated and controlled or the light source 111 is directly turned off to stop emitting light. The driving chip 113 determines whether the input electrical signal satisfies a preset condition, so as to regulate the intensity of the output optical signal, for example: if the input electrical signal is stronger, the intensity of the output optical signal is adjusted to be reduced, and if the input electrical signal exceeds a preset threshold, the light source 111 is directly turned off. However, when the diffractive optical element 112 of the depth camera transmitter 11 is damaged or falls off, the photodiode 110 cannot monitor the output electrical signal as a result of the output optical signal, or cannot monitor the intensity of the output optical signal in real time when the photodiode 110 is damaged, in which case, if the driving chip 113 drives the light source 111 to maintain high emission power or continuously emit light, there is a great safety problem. Therefore, the timer circuit 130 cooperates with the driving chip 113 to perform safety monitoring, so as to effectively solve the abnormal condition of the photodiode 110 or the driving chip 113. The timer circuit 130 receives the output electrical signal of the photodiode 110, and determines whether the output electrical signal meets a reset instruction, and if the output electrical signal meets the reset instruction, the light source 111 is kept to emit light; if an abnormality occurs, the timer circuit 130 will force the light source 111 to stop emitting light signals. For example, when the timer circuit 130 does not receive the electrical signal output by the photodiode 110 for more than the preset duration, the timer circuit 130 will forcibly regulate the power supply to stop supplying power to the light source 111, and turn off the light source 111. Or, when the driving chip 113 is abnormal, the light source 111 continuously emits light due to the fact that the light source is not adjusted to be turned off, at this time, the duration time of the high level signal output by the photodiode 110 exceeds the preset duration time, and the timer circuit 130 can also forcibly adjust and control the power supply to stop supplying power to the light source, so as to turn off the light source.
In some embodiments, the security monitoring system further comprises a transparent conductive film 115, the transparent conductive film 115 being disposed on a surface of the diffractive optical element 112 of the depth camera. When the diffractive optical element 112 is damaged or detached, a high-power laser signal may be output. Therefore, the transparent conductive film 115 provided on the surface of the diffractive optical element 112 can monitor whether or not an abnormality occurs in the diffractive optical element 112. Specifically, the transparent conductive film 115 is connected to the driving chip 113 through a metal wire, and the driving chip 113 compares and analyzes the resistance change of the transparent conductive film 115 to determine the integrity of the diffractive optical element 112. In some embodiments, the transparent conductive film 115 may also be directly connected to the processing circuit 13 through a metal wire. The driving chip 113 or the processing circuit 13 monitors the resistance value or the capacitance value of the transparent conductive film 115 in real time, compares the monitored resistance value or the monitored capacitance value with a preset safety threshold interval, determines whether the monitored resistance value or the monitored capacitance value is within the safety threshold interval, determines that the integrity of the transparent conductive film 115 is damaged if the monitored resistance value or the monitored capacitance value exceeds the safety threshold interval, that is, the diffractive optical element 112 may be broken and damaged, starts to control the light emitting state of the light source 111, turns off the light source 111, and ensures laser safety.
As another embodiment of the present invention, there is also provided an electronic device, which may be a desktop, a desktop installation device, a portable device, a wearable device, an onboard device, a robot, or the like. Specifically, the electronic device includes: memory, processor and the depth camera safety monitoring system of any preceding embodiment.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.
In this specification, the schematic representations of the terms used above are not necessarily intended to 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although the present embodiments and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope as defined by the appended claims.
Claims (10)
1. A depth camera safety monitoring system characterized in that: the circuit comprises a photosensitive diode, a driving chip, a timer circuit and a processing circuit; wherein the photodiode is disposed near a light source of the depth camera and is connected to the driver chip and the timer circuit, respectively; the driving chip is connected with a light source of the depth camera and used for controlling the light source to emit light beams outwards; the input of the timer circuit is connected with the photosensitive diode, and the output of the timer circuit is connected with the driving chip.
2. The depth camera security monitoring system of claim 1, wherein: the photosensitive diode is arranged on a substrate provided with the light source and used for monitoring the light signal intensity of the light beam emitted by the light source and outputting the light signal intensity to the driving chip.
3. The depth camera security monitoring system of claim 1, wherein: the driving chip comprises a power supply to supply power to the light source.
4. The depth camera security monitoring system of claim 1, wherein: the driving chip comprises a temperature sensor for monitoring the temperature of the light source.
5. The depth camera security monitoring system of claim 1, wherein: the depth camera further comprises a transparent conductive film, and the transparent conductive film is arranged on the surface of the diffractive optical element of the depth camera.
6. A TOF depth camera, characterized by: comprises a transmitter, a collector and a processing circuit; wherein the emitter comprises a light source consisting of one or more lasers, a photodiode disposed adjacent to the light source, a diffractive optical element, and a driver chip; the collector comprises a TOF image sensor, a filtering unit and a receiving optical element; the processing circuit comprises a timer circuit, wherein the input of the timer circuit is connected with the photosensitive diode, and the output of the timer circuit is connected with the driving chip.
7. The TOF depth camera of claim 6, wherein: the photosensitive diode is arranged on a substrate on which the light source is mounted to monitor the intensity of an optical signal of a light beam emitted by the light source and output the optical signal to the driving chip.
8. The TOF depth camera of claim 6, wherein: the surface of the diffraction optical element is provided with a transparent conductive film for monitoring whether the diffraction optical element is abnormal or not.
9. The TOF depth camera of claim 8, wherein: the transparent conductive film is connected with the driving chip or the processing circuit through a metal wire, and the resistance value or the capacitance value of the transparent conductive film is monitored in real time through the driving chip or the processing circuit so as to judge whether the transparent conductive film is damaged.
10. An electronic device, characterized in that: comprising a memory, a processor, and the depth camera security monitoring system of any one of claims 1-5.
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| CN202120686187.0U CN215116808U (en) | 2021-04-01 | 2021-04-01 | Depth camera safety monitoring system, TOF depth camera and electronic equipment |
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| CN202120686187.0U CN215116808U (en) | 2021-04-01 | 2021-04-01 | Depth camera safety monitoring system, TOF depth camera and electronic equipment |
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