CN215728840U - Time-of-flight ranging sensing module and terminal - Google Patents
Time-of-flight ranging sensing module and terminal Download PDFInfo
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- CN215728840U CN215728840U CN202121982449.4U CN202121982449U CN215728840U CN 215728840 U CN215728840 U CN 215728840U CN 202121982449 U CN202121982449 U CN 202121982449U CN 215728840 U CN215728840 U CN 215728840U
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Abstract
The utility model relates to a flight time ranging sensing module and a terminal. Time of flight range finding sensing module includes: a light emitter, a light receiver, and a mask. The light emitter is used for emitting ranging light signals to the target object. The light receiver and the light emitter have a spacing therebetween. The light receiver comprises a triggering part and a sensing part which are arranged in different areas. The trigger part is used for receiving a part of optical signals of the ranging optical signals to generate first timing signals. The sensing part is used for receiving a reflected light signal after the ranging light signal irradiates the target object so as to generate a second timing signal. The light shielding plate is arranged in the interval between the light receiver and the light emitter and is used for shielding crosstalk light signals between the light emitter and the light receiver. The light screen is provided with a light hole, and the light hole is used for transmitting part of the optical signals of the ranging optical signals to the trigger part. The flight time ranging sensing module and the terminal provided by the utility model can improve the ranging accuracy of the flight time ranging sensing module.
Description
Technical Field
The utility model relates to the technical field of distance measurement sensing, in particular to a flight time distance measurement sensing module and a terminal.
Background
The Time of flight (TOF) ranging sensing module continuously transmits laser pulses to a target object through a light emitter, receives the laser pulses returned from the target object through a light receiver, and can acquire the flight Time of the laser pulses, so that the distance from the target object to the TOF ranging sensing module is determined by using the flight Time of the laser pulses and the propagation speed of the laser pulses.
However, as the size of the time-of-flight ranging sensing module is further miniaturized, the distance between the optical emitter and the optical receiver is smaller and smaller, so that crosstalk optical signals are easy to occur between the optical emitter and the optical receiver, and the ranging accuracy of the time-of-flight ranging sensing module is poor.
In the prior art, a light shielding plate is arranged between the light emitter and the light receiver. The processor drives the time of the light emitter for emitting the ranging light signal to serve as a first timing signal; when the light receiver receives the reflected light signal after the ranging light signal irradiates the target object, the processor generates a second timing signal. The processor can determine the depth information of the target object according to the time difference between the first timing signal and the second timing signal. However, the first timing signal obtained by this method is affected by the ambient temperature and the circuit configuration, and thus the distance detection accuracy of the target object is deteriorated.
SUMMERY OF THE UTILITY MODEL
Based on this, the embodiment of the utility model provides a flight time ranging sensing module and a terminal, which can improve the ranging accuracy of the flight time ranging sensing module.
The embodiment of the utility model provides a flight time ranging sensing module. This time of flight range finding sensing module includes: the system comprises a light emitter, a light receiver, a light baffle and a processor. The light emitter is used for emitting ranging light signals to the target object. The light receiver and the light emitter have a spacing therebetween. The light receiver comprises a triggering part and a sensing part which are arranged in different areas. The light shielding plate is arranged in the interval between the light receiver and the light emitter and is used for shielding crosstalk light signals between the light emitter and the light receiver. The light screen is provided with a light hole, and the light hole is used for transmitting part of the optical signals of the ranging optical signals to the trigger part. The processor is connected with the triggering part and the sensing part respectively. The trigger part is used for receiving a part of optical signals of the ranging optical signals so as to enable the processor to generate a first timing signal. The sensing part is used for receiving a reflected light signal after the ranging light signal irradiates the target object so as to enable the processor to generate a second timing signal. The processor is used for determining the depth information of the target object according to the time difference between the first timing signal and the second timing signal.
In some embodiments, the time-of-flight ranging sensing module further comprises: a base and a cover plate. The base is used for carrying the optical transmitter and the optical receiver. The cover plate is buckled with the base, and a first light transmission part opposite to the light emitter and a second light transmission part opposite to the light receiver are arranged on the cover plate. The shading plate is also positioned in the accommodating space enclosed by the base and the cover plate. The ranging optical signal is transmitted to the target object through the first light transmission part, and part of the ranging optical signal is reflected to the light transmission hole by the cover plate and transmitted to the trigger part through the light transmission hole. The reflected light signal after the ranging light signal is irradiated to the target object is transmitted to the sensing part through the second light transmitting part.
Optionally, a gap is provided between the light shielding plate and the base.
Optionally, a gap is provided between the light shielding plate and the cover plate.
In some embodiments, the shutter plate is movably coupled to the base; the shutter plate is used for moving between the light emitter and the light receiver. So, the distance between light screen and the trigger part is adjustable, is favorable to adjusting the position of light screen on the base at the in-process of assembling time of flight sensing module to reasonable debugging range finding light signal is reflected to the energy of the partial light signal in the light-transmitting hole, thereby ensures that trigger part receives the light signal that the energy is suitable and stable so that the treater generates accurate first timing signal.
In other embodiments, the visor is integrally formed with the base; or the shading plate and the cover plate are integrally formed.
In some embodiments, the range of angles between the axis of the light-transmissive hole and the horizontal plane includes: 0 to 45 degrees.
In some embodiments, the portion of the light-transmissive hole virtually elongated in the direction of the axis thereof intersects the trigger portion. Therefore, part of optical signals of the ranging optical signals can be transmitted to the trigger part through the light-transmitting holes in an aligned mode, so that high optical transmission efficiency is achieved, and the processor can timely generate accurate first timing signals.
In some embodiments, the aperture of the light transmissive hole has a range of values including: 0.2 mm-0.8 mm.
In some embodiments, the thickness of the shutter plate ranges from 1mm to 3 mm.
The embodiment of the utility model also provides a terminal which comprises the time-of-flight ranging sensing module in any one of the embodiments.
In the time-of-flight ranging sensing module and the terminal provided by the embodiment of the disclosure, the optical receiver comprises a triggering part and a sensing part. In this way, the trigger unit receives a part of the optical signals of the ranging optical signal, and the part of the optical signals can be used as trigger signals, so that the processor can accurately generate the first timing signal. Then, the sensor receives the reflected light signal after the ranging light signal is transmitted to the target object, and the reflected light signal can be used as a termination signal, so that the processor can accurately generate a second timing signal. Based on the time difference, the processor can accurately determine the depth information of the target object according to the time difference between the first timing signal and the second timing signal. Because the triggering part and the sensing part are integrated in the optical receiver, namely are positioned in the same environment, the first timing signal and the second timing signal which are correspondingly generated by the processor are not easily influenced by environmental factors or the heating temperature of the optical transmitter, so that the processor can be ensured to accurately acquire the depth information of the target object.
In addition, the light shielding plate is arranged between the light emitter and the light receiver, so that crosstalk light signals between the light emitter and the light receiver can be effectively shielded by the light shielding plate, for example, the phenomenon that distance measurement light signals emitted by the light emitter are transmitted to a sensing part of the light receiver after being reflected and/or diffused by the cover plate to cause the processor to generate wrong second timing signals is avoided, and the phenomenon that the crosstalk light signals have adverse effects on the distance measurement of the time-of-flight distance measurement sensing module is avoided.
In addition, the light screen is provided with a light hole, and partial optical signals of the distance measuring optical signals emitted by the light emitter can be transmitted to the trigger part through the light hole in time by utilizing the light hole, so that the processor can generate a first timing signal in time. Therefore, this disclosed embodiment sets up the light screen that has the light trap in time of flight range finding sensing module, can receive the basis of finding range light signal in order to ensure that the treater in time generates first timing signal at the trigger part that does not influence light receiver, effectively isolates the sensitization of the light signal of the most crosstalking to sensing part between optical emitter and the light receiver and produces and crosstalks to be favorable to promoting the range finding precision of time of flight range finding sensing module.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a time-of-flight ranging sensing module according to an embodiment;
FIG. 2 is an enlarged schematic view of a region I of the time-of-flight ranging sensing module shown in FIG. 1;
FIG. 3 is a schematic structural diagram of another time-of-flight ranging sensing module provided in an embodiment;
FIG. 4 is a schematic structural diagram of another time-of-flight ranging sensing module provided in an embodiment;
FIG. 5 is a schematic structural diagram of another time-of-flight ranging sensing module provided in an embodiment;
fig. 6 is a schematic structural diagram of another time-of-flight ranging sensing module provided in an embodiment.
Description of reference numerals:
100-a flight time distance measuring sensing module, 1-a base, 2-a cover plate, 21-a first light transmission part,
22-second light-transmitting part, 10-processor, 3-light emitter, 4-light receiver,
41-trigger part, 42-sensing part; 5-shading plate, 6-light hole,
the spacing between the L-ray emitter and the light receiver, the thickness of the T-shade,
d-the aperture of the light hole, and the angle between the axis of the alpha-light hole and the horizontal plane.
Detailed Description
To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present invention.
It will also be understood that when interpreting elements, although not explicitly described, the elements are to be interpreted as including a range of errors which are within the acceptable range of deviation of the particular values as determined by those skilled in the art. For example, "about," "approximately," or "substantially" may mean within one or more standard deviations, without limitation.
Further, in the specification, the phrase "plan view" refers to a drawing when the target portion is viewed from above, and the phrase "sectional view" refers to a drawing when a section taken by vertically cutting the target portion is viewed from the side.
Furthermore, the drawings are not 1: 1, and the relative dimensions of the various elements in the figures are drawn for illustration only and not necessarily to true scale.
The Time of flight (TOF) ranging sensing module can be used for measuring a three-dimensional structure or a three-dimensional contour of a measured object to obtain a gray image and a distance image, and can be widely applied to the fields of somatosensory control, behavior analysis, monitoring, automatic driving, artificial intelligence, machine vision, automatic 3D modeling and the like.
Referring to fig. 1, 2 and 3, a time-of-flight sensing module 100 is provided according to an embodiment of the present disclosure. Time-of-flight sensing module 100 includes: the device comprises a base 1 and a cover plate 2 which are arranged in a buckling mode, and a light emitter 3, a light receiver 4 and a processor 10 which are arranged in an accommodating space formed by the base 1 and the cover plate 2 in a surrounding mode.
The base 1 is used for carrying the optical transmitter 3 and the optical receiver 4, and the base 1 is, for example, a circuit board or a support base integrated with the circuit board. The processor 10 may be integrated on a circuit board of the base 1, for example arranged inside the base 1 or on a surface of the base 1. The processor 10 is for example a laser ranging chip.
The cover plate 2 is buckled with the base 1, and the cover plate 2 can be detachably connected or fixedly connected with the base 1. The cover 2 is provided with a first light-transmitting portion 21 facing the light emitter 3 and a second light-transmitting portion 22 facing the light receiver 4. The first and second light transmission portions 21 and 22 may be light transmission holes, or optical elements such as light transmission mirrors having a light focusing function and a high light transmission rate.
The light emitter 3 is used for emitting a ranging light signal to a target object, and the light emitter 3 is, for example, a laser emitter, particularly a near-infrared laser emitter. The ranging light signal emitted by the light emitter 3 typically has a certain divergence angle, for example 20 ° to 30 °. Thus, most of the ranging optical signals emitted by the optical emitter 3 can be emitted through the first light-transmitting part 21 on the cover plate 2, and a small part of the signals can be reflected and/or diffusely reflected in the accommodating space enclosed by the cover plate 2 and the base 1.
The light receiver 4 and the light emitter 3 have a spacing L therebetween. The light receiver 4 includes a trigger portion 41 and a sensing portion 42 provided in divided regions. The trigger unit 41 and the sensor unit 42 are connected to the processor 10. The processor 10 may be disposed directly below the optical receiver 4. The trigger unit 41 is used for receiving a part of the optical signal of the ranging optical signal to make the processor 10 generate the first timing signal T0First timing signal T0For example a timing trigger signal. The sensor 42 is used for receiving the reflected light signal after the ranging light signal is irradiated to the target object so as to enable the processor 10 to generate a second timing signal T1A second timing signal T1Such as a timing stop signal. The processor 10 is configured to determine a first timing signal T0And a second timing signal T1The time difference between the two positions determines the depth information of the target, i.e. the distance from the target to the time-of-flight ranging sensing module 100.
Here, it is understood that the triggering portion 41 and the sensing portion 42 of the optical receiver 4 are, for example, photosensors or image sensors, and both are mainly used to receive an optical signal and convert the optical signal into an electrical signal output. The trigger part 41 and the sensor part 42 are located in different areas of the light receiver 4, respectively. Alternatively, the light sensing area of the trigger part 41 is smaller than that of the sensing part 42. The triggering portion 41 may be provided on either side of the sensing portion 42. For example, as shown in fig. 1, the trigger portion 41 is located on the left side of the sensing portion 42; alternatively, the trigger part 41 is located on the right side of the sensing part 42, as shown in fig. 3, for example.
With continued reference to fig. 1 and 3, the time-of-flight sensing module 100 further includes: and the shading plate 5 is positioned in an accommodating area enclosed by the base 1 and the cover plate 2. The light shielding plate 5 is used for shielding crosstalk optical signals between the optical transmitter 3 and the optical receiver 4, and the light shielding plate 5 is further arranged in the interval L between the optical receiver 4 and the optical transmitter 3. The light shielding plate 5 is provided with a light transmitting hole 6, and the light transmitting hole 6 is used for transmitting part of the optical signal of the ranging optical signal to the trigger part 41. Alternatively, the light shielding plate 5 is a metal plate or a plastic plate.
From above, the ranging optical signal emitted from the light emitter 3 may be transmitted to the target object through the first light transmission portion 21, and a part of the ranging optical signal may be reflected by the cover plate 2 to the light transmission hole 6 and transmitted to the triggering portion 41 through the light transmission hole 6. The reflected light signal after the ranging light signal is irradiated to the target object may be transmitted to the sensor unit 42 through the second transparent portion 22.
In the embodiment of the present disclosure, the optical receiver 4 includes the triggering portion 41 and the sensing portion 42. In this way, the trigger unit 41 receives a part of the optical signal of the ranging optical signal, and the part of the optical signal can be used as a trigger signal, so that the processor 10 can accurately generate the first timing signal T0. Then, the sensor unit 42 receives the reflected light signal transmitted from the ranging light signal to the target object, and the processor 10 can accurately generate the second timing signal T using the reflected light signal as a termination signal1. Based on this, the processor 10 is based on the first timing signal T0And a second timing signal T1The depth information of the target object can be accurately determined by the time difference. Since the triggering unit 41 and the sensing unit 42 are integrated in the light receiver 4, i.e. located in the same environment, the first timing signal T generated by the processor 10 is corresponding to0And a second timing signal T1And the depth information of the target object can be accurately acquired by the processor 10 because the depth information is not easily influenced by environmental factors or the heating temperature of the light emitter 3.
Moreover, the light shielding plate 5 is disposed between the optical emitter 3 and the optical receiver 4 in the embodiment of the disclosure, and the light shielding plate 5 can be used to effectively shield the crosstalk optical signal between the optical emitter 3 and the optical receiver 4, for example, to prevent the ranging optical signal emitted by the optical emitter 3 from being transmitted to the sensing portion 42 of the optical receiver 4 after being reflected and/or diffusely reflected by the cover plate 2, so as to cause the processor 10 to generate an erroneous second timing signal, thereby preventing the crosstalk optical signal from adversely affecting the ranging of the time-of-flight ranging sensing module 100.
In addition, the light shielding plate 5 is provided with a light hole 6, and the light hole 6 can ensure that part of the ranging light signal emitted by the light emitter 3 can pass through the light hole 6 to be transmitted to the triggering part 41 in time, so that the processor 10 can generate the first timing signal T in time0. Therefore, the light shielding plate 5 with the light hole 6 is disposed in the time-of-flight ranging sensing module 100 according to the embodiment of the disclosure, so that the triggering portion 41 that does not affect the light receiver 4 can receive the ranging light signal to ensure that the processor 10 can generate the first timing signal T in time0On the basis, effectively isolated the light signal of the most crosstalking between optical emitter 3 and optical receiver 4 produces crosstalking to the sensitization of sensing part 42 to be favorable to promoting the range finding precision of time of flight range finding sensing module 100.
It will be appreciated that the first timing signal T0Generating an optical signal requiring a certain energy, e.g. the energy of the part of the optical signal is greater than or equal to 106ppm (wt.%). Based on this, the shape and the aperture of the light hole 6 and the installation position of the light hole on the light shielding plate 5 can be determined comprehensively according to the requirements of the trigger part 41 on the light signal energy, the installation position of the trigger part 41, the light sensing area of the trigger part 41, the size of the accommodating space enclosed by the base 1 and the cover plate 2, the divergence angle of the light signal emitted by the light emitter 3, the distance between the light emitter 1 and the trigger part 41, the thickness of the light shielding plate 5, the distance from the light shielding plate 5 to the trigger part 41, and other factors.
For example, referring to fig. 1 and fig. 2, a distance between the light emitter 1 and the trigger portion 41 ranges from 3.5mm to 6mm, for example, 3.5mm, 4mm, 5mm, or 6 mm. The thickness T of the light shielding plate 5 ranges from 1mm to 3mm, for example, 1mm, 1.5mm, 2mm or 3 mm. The divergence angle β of the ranging light signal emitted by the light emitter 3 comprises 20 ° to 30 °, for example 20 °, 22 °, 26 ° or 30 °. But is not limited thereto.
For example, referring to fig. 2, the light hole 6 is a circular hole, and the aperture D of the light hole 6 ranges from 0.2mm to 0.8mm, such as 0.2mm, 0.5mm, 0.6mm, or 0.8 mm. But not limited thereto, the light-transmitting hole 6 may be a square hole, other regular-shaped holes, other irregular-shaped holes or slits, or any other structure that allows an optical signal to pass through. Accordingly, the cross-sectional area of the light-transmitting hole 6 can be determined according to the energy of the optical signal that the unit area thereof allows to transmit.
For example, referring to fig. 2, the included angle α between the axis of the light hole 6 and the horizontal plane is 0 ° to 45 °, such as 0 °, 15 °, 20 °, 25 °, 30 °, 40 °, or 45 °. But is not limited thereto.
In a specific example, the divergence angle β of the ranging light signal emitted by the light emitter 3 is 26 °. The distance between the light emitter 1 and the trigger 41 is 4 mm. The included angle alpha between the axis of the light hole 6 and the horizontal plane is 30 degrees.
Illustratively, as shown in fig. 2, a portion of the light-transmitting hole 6 virtually extending in the axial direction thereof intersects the trigger 41. Thus, after the partial optical signals of the ranging optical signals are reflected to the light-transmitting holes 6 by the cover plate 2, the ranging optical signals can be aligned and transmitted to the triggering portion 41 through the light-transmitting holes 6, so that the high optical transmission efficiency is achieved, and accurate first timing signals can be generated in time.
In some embodiments, referring to fig. 1, the light shielding plate 5 is movably connected to the base 1; the shutter 5 is adapted to move between the light emitter 3 and the light receiver 4, for example in the X-X' direction.
Optionally, a translation mechanism 7 is arranged between the light shielding plate 5 and the base 1. The structure of the translation mechanism 7 can be selected according to actual requirements, for example, a guide rail-slide block moving pair is adopted. The embodiment of the present disclosure does not limit this, so as to realize the relative movement between the light shielding plate 5 and the base 1.
In the embodiment of the present disclosure, the light shielding plate 5 is movably connected to the base 1, so that the distance between the light shielding plate 5 and the triggering portion 41 is adjustable, which is beneficial to adjusting the position of the light shielding plate 5 on the base 1 in the process of assembling the time-of-flight sensing module 100, so as to reasonably debug the energy of the partial light signal reflected to the light hole 6 by the ranging light signal, thereby ensuring that the triggering portion 41 receives the light signal with proper and stable energy to enable the processor 10 to generate the accurate first timing signal T0。
In addition, referring to fig. 1, the light shielding plate 5 is movably connected to the base 1, and the top of the light shielding plate 5 can abut against the cover plate 2. In this way, the light shielding plate 5 can effectively close the space between the optical transmitter 3 and the optical receiver 4 to isolate the crosstalk optical signal to the maximum extent.
Of course, in other examples, there is a gap between the top of the light shielding plate 5 and the cover plate 2, and the gap may also be used to transmit a part of the optical signal of the ranging optical signal to the triggering portion 41, so as to enhance the energy of the optical signal received by the triggering portion 41, so that the processor 10 generates the accurate and stable first timing signal T0. In addition, a gap is reserved between the top of the shading plate 5 and the cover plate 2, so that the requirement of the top of the shading plate 5 on process precision can be reduced, and the cover plate 2 and the base 1 are easy to assemble.
In other embodiments, referring to fig. 3 and 4, the light shielding plate 5 is fixedly connected to the base 1, such as by welding, riveting, or gluing. Illustratively, the light shielding plate 5 is integrally formed with the base 1, so that the assembly process of the time-of-flight sensing module 100 can be simplified, and the production efficiency can be improved.
Further, alternatively, as shown in fig. 3, the top of the shade 5 abuts the cover plate 2. In this way, the light shielding plate 5 can effectively close the space between the optical transmitter 3 and the optical receiver 4 to isolate the crosstalk optical signal to the maximum extent.
Optionally, as shown in fig. 4, a gap is formed between the top of the light shielding plate 5 and the cover plate 2, and a part of the optical signal of the ranging optical signal can be transmitted to the triggering portion 41 through the gap, so as to enhance the energy of the optical signal received by the triggering portion 41, and enable the processor 10 to generate the accurate and stable first timing signal T0. In addition, a gap is reserved between the top of the shading plate 5 and the cover plate 2, so that the requirement of the top of the shading plate 5 on process precision can be reduced, and the cover plate 2 and the base 1 are easy to assemble.
In still other embodiments, referring to fig. 5 and 6, the light shielding plate 5 is fixedly connected to the cover plate 2, such as by welding, riveting or gluing. Illustratively, the light shielding plate 5 and the cover plate 2 are integrally formed, so that the assembly process of the time-of-flight sensing module 100 can be simplified, and the production efficiency can be improved.
Alternatively, as shown in fig. 5, the bottom of the light shielding plate 5 abuts against the base 1. In this way, the light shielding plate 5 can effectively close the space between the optical transmitter 3 and the optical receiver 4 to isolate the crosstalk optical signal to the maximum extent.
Optionally, as shown in fig. 6, a gap is formed between the bottom of the light shielding plate 5 and the base 1, and a part of the optical signal of the ranging optical signal can be transmitted to the triggering portion 41 through the gap, so as to enhance the energy of the optical signal received by the triggering portion 41, and enable the processor 10 to generate the accurate and stable first timing signal T0. In addition, a gap is reserved between the bottom of the shading plate 5 and the cover plate 2, so that the requirement of the bottom of the shading plate 5 on process precision can be reduced, and the cover plate 2 and the base 1 are easy to assemble.
As can be seen from the above, a gap may be provided between the light shielding plate 5 and the base 1, and/or between the light shielding plate 5 and the cover plate 2. The shape and size of the gap can be selected according to actual requirements, so as to limit the transmission of part of the optical signal of the ranging optical signal to the triggering portion 41.
The embodiment of the utility model also provides a terminal which comprises the time-of-flight ranging sensing module in any one of the embodiments. The terminal is any electronic device with a flight time measuring function, such as a depth camera, a virtual reality device, a 3D scene reconstruction device, a mobile phone and the like. In the embodiments of the present disclosure, the technical effect that the terminal can achieve is the same as the time-of-flight sensing module in some of the foregoing embodiments, and details are not described here.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a time of flight range finding sensing module which characterized in that includes:
the light emitter is used for emitting a ranging light signal to a target object;
a light receiver spaced from the light emitter; the optical receiver comprises a trigger part and a sensing part which are arranged in different areas;
a light shielding plate arranged in the interval and used for shielding crosstalk optical signals between the optical transmitter and the optical receiver; the light shading plate is provided with a light hole, and the light hole is used for transmitting part of the optical signals of the ranging optical signals to the trigger part;
the processor is connected with the triggering part and the sensing part respectively;
the triggering part is used for receiving a part of optical signals of the ranging optical signals so as to enable the processor to generate a first timing signal; the sensing part is used for receiving a reflected light signal after the ranging light signal irradiates the target object so as to enable the processor to generate a second timing signal; the processor is used for determining the depth information of the target object according to the time difference between the first timing signal and the second timing signal.
2. The time-of-flight ranging sensing module of claim 1, further comprising:
a base for carrying the optical transmitter, the optical receiver and the processor;
the cover plate is buckled with the base; the cover plate is provided with a first light-transmitting part opposite to the light emitter and a second light-transmitting part opposite to the light receiver;
the shading plate is also positioned in an accommodating space enclosed by the base and the cover plate; the distance measuring optical signal passes through the first light-transmitting part and is transmitted to the target object, and part of the optical signal of the distance measuring optical signal is reflected to the light-transmitting hole by the cover plate and is transmitted to the trigger part through the light-transmitting hole;
and the reflected light signal after the ranging light signal irradiates the target object passes through the second light-transmitting part and is transmitted to the sensing part.
3. The time-of-flight ranging sensing module of claim 2,
a gap is formed between the shading plate and the base;
and/or a gap is formed between the shading plate and the cover plate.
4. The time of flight ranging sensing module of claim 2, wherein the shutter plate is movably connected to the base; the shutter plate is used for moving between the optical transmitter and the optical receiver.
5. The time-of-flight ranging sensing module of claim 2,
the shading plate and the base are integrally formed;
or the shading plate and the cover plate are integrally formed.
6. The time-of-flight ranging sensing module according to any one of claims 1 to 5, wherein an included angle between an axis of the light hole and a horizontal plane is within a range including: 0 to 45 degrees.
7. The time-of-flight ranging sensing module according to any one of claims 1 to 5, wherein a virtually extended portion of the light-transmitting hole along the axial line direction intersects the trigger.
8. The time-of-flight ranging sensing module according to any one of claims 1 to 5, wherein the aperture of the light hole has a range of values including: 0.2 mm-0.8 mm.
9. The time-of-flight ranging sensing module according to any one of claims 1 to 5, wherein the thickness of the light shielding plate ranges from 1mm to 3 mm.
10. A terminal comprising a time-of-flight ranging sensing module according to any one of claims 1 to 9.
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| WO2022257558A1 (en) * | 2021-06-10 | 2022-12-15 | Oppo广东移动通信有限公司 | Time-of-flight module, terminal and depth detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022257558A1 (en) * | 2021-06-10 | 2022-12-15 | Oppo广东移动通信有限公司 | Time-of-flight module, terminal and depth detection method |
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