CN213149250U

CN213149250U - DToF distance sensor system

Info

Publication number: CN213149250U
Application number: CN202021920521.6U
Authority: CN
Inventors: 东尚清
Original assignee: Shanghai Daxin Semiconductor Co ltd
Current assignee: Shanghai Daxin Semiconductor Co ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2021-05-07
Anticipated expiration: 2030-09-04

Abstract

The utility model provides a DToF distance sensor system, which comprises a receiving end and a transmitting end; the receiving end comprises a DToF sensor; the transmitting end comprises a driving circuit, a laser, a detector and an optical element; the laser and the detector are connected with the driving circuit; and the laser emits light which passes through the optical element to the surface of the object to be measured and then is reflected to the DToF sensor. The constructed DToF distance sensor system can detect the 3D distance more accurately, and can control to emit different types of light spots by changing the types of different optical elements, so that different market requirements are met.

Description

DToF distance sensor system

Technical Field

The utility model relates to a distance sensor prepares the field, especially relates to a DToF distance sensor system.

Background

The DToF (Direct Time of Flight) distance sensor can be applied to occasions such as AR, VR, unlocking, background blurring and the like in a mobile phone. So-called time-of-flight 3D imaging is an imaging method in which the distance to an object is obtained by detecting the time of flight (round trip) of a light pulse by continuously transmitting the light pulse to the object and then receiving the light returning from the object with a sensor.

The DToF distance sensor is based on Avalanche triggering of SPAD (Single Photon Avalanche Diode) for ranging. Specifically, referring to fig. 1, fig. 1 is a schematic diagram illustrating a working principle of distance measurement of a distance sensor in the prior art; the DToF distance sensor 10 includes an SPAD array 11 and a processing module, and when a repetitive pulse is emitted, the SPAD array 11 obtains depth information by calculating and processing light signals reflected from different distance surfaces through a lens 20 and the processing module.

As shown in fig. 2, fig. 2 is a schematic diagram of a SPAD array structure in the prior art, and the SPAD array 20 includes m × n SPADs 21.

However, it is desirable to provide a dtod distance sensor system that can be adapted to different market requirements.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a DToF distance sensor system, it is applicable in the detection of distance.

In order to achieve the above object, the utility model provides a DToF distance sensor system, include:

a receiving end and a transmitting end;

the receiving end comprises a DToF sensor;

the transmitting end comprises a driving circuit, a laser, a detector and an optical element; the laser and the detector are connected with the driving circuit; and the laser emits light which passes through the optical element to the surface of the object to be measured and then is reflected to the DToF sensor.

Preferably, in the DToF distance sensor system, the optical element includes a collimator lens and a diffractive optical element, and the laser emits light to the surface of the object to be measured through the collimator lens and the diffractive optical element.

Preferably, in the DToF distance sensor system, the optical element includes a diffusion sheet, and the laser emission light passes through the diffusion sheet to the surface of the object to be measured.

Preferably, in the dtod distance sensor system, the laser is a vertical cavity surface emitting laser.

Preferably, in the dtod distance sensor system, the detector is a photodetector.

Preferably, in the DToF distance sensor system, the receiving end further includes a lens, and the reflected light from the surface of the object to be measured passes through the lens and then irradiates the DToF sensor.

Preferably, in the DToF distance sensor system, a filtering layer is disposed on a surface of the DToF sensor.

Compared with the prior art, the beneficial effects of the utility model are mainly embodied in that: the constructed DToF distance sensor system can detect the 3D distance more accurately, and can control to emit different types of light spots by changing the types of different optical elements, so that different market requirements are met.

Drawings

FIG. 1 is a schematic diagram illustrating a distance measuring operation principle of a distance sensor in the prior art;

FIG. 2 is a schematic diagram of a SPAD array in the prior art;

fig. 3 is a schematic structural diagram of a DToF distance sensor system according to a first embodiment of the present invention;

fig. 4 is a schematic diagram of a spot light source emitted by a DToF distance sensor according to a first embodiment of the present invention;

fig. 5 is a schematic structural diagram of a DToF distance sensor system according to a second embodiment of the present invention;

fig. 6 is a schematic diagram of a shape of an area array light source emitted by a dtod distance sensor according to an embodiment of the present invention.

Detailed Description

The high resolution distance sensor pixel structure and distance sensor of the present invention will now be described in greater detail with reference to the schematic drawings, in which preferred embodiments of the present invention are shown, it being understood that those skilled in the art may modify the invention described herein while still achieving the advantageous effects of the present invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.

In the interest of clarity, not all features of an actual implementation are described. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific details must be set forth in order to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art.

The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

The utility model provides a DToF distance sensor system, include:

a receiving end and a transmitting end;

the receiving end comprises a DToF sensor;

The receiving end comprises a DToF sensor, as shown in fig. 2, the DToF sensor is provided with an SPAD array for receiving the light array reflected from the surface of the object to be detected, and the distance corresponding to the surface of the object to be detected is calculated in a ToF mode, so that the three-dimensional distance of the surface of the object to be detected can be detected.

In the DToF distance sensor system proposed in this embodiment, the following advantages are mainly found: the 3D distance can be detected more accurately, and different types of light spots can be controlled to be emitted by changing the types of different optical elements, so that different market demands are met.

Example one

Referring to fig. 3, in the present embodiment, a DToF distance sensor system 100 is provided, which includes a receiving end and a transmitting end;

the receiving end comprises a DToF sensor;

the emitting end comprises a driving circuit, a laser, a detector, a collimating mirror and a DOE (diffraction Optical Elements); the laser and the detector are connected with the driving circuit; the light emitted by the laser passes through the collimating mirror and the DOE to reach the surface 200 of the object to be measured and then is reflected to the DToF sensor.

The Laser is a Vertical-Cavity Surface-Emitting Laser (VCSEL), and the detector is a Photodetector (PD). The laser emits light to the surface of the object to be measured through the collimating lens and the diffractive optical element, and emits a spot light source shown in fig. 4, wherein the spot light source is high in measurement accuracy. Each emission point light source precisely hits one or more pixels (pixels), thus making full use of the emitted light and reducing power consumption. Therefore, the transmitting power can be improved under the same power consumption, so that the sensitivity is improved, and the measuring range is improved.

In addition, the receiving end further includes a lens 110, and the reflected light from the surface 200 of the object to be measured passes through the lens 110 and then irradiates the DToF sensor. Further, the surface of the DToF sensor may further be provided with a filter layer 120, and the filter layer 120 may filter a part of interference signals, so that the photon detection efficiency may be improved together with the lens, and interference may be reduced.

Example two

Referring to fig. 5, the DToF distance sensor system 100 of this embodiment is similar to the first embodiment, and the only difference is that the collimating mirror and DOE of the first embodiment are replaced by a Diffuser (Diffuser), so as to generate the area array light source shown in fig. 6, where the area array light source has lower requirements for the installation and structure of the optical element, and thus the cost can be reduced.

The light emitted by the laser passes through the diffusion sheet to the surface of the object 200 to be measured, and is reflected to the lens 110, and passes through the filter layer 120 to the dtod distance sensor.

In this embodiment, the emitted area array light source has higher precision, and can comprehensively detect the three-dimensional distance of the object 200.

The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.

Claims

1. A dtod distance sensor system, comprising:

a receiving end and a transmitting end;

the receiving end comprises a DToF sensor;

2. The DToF distance sensor system of claim 1, wherein the optical element comprises a collimator lens and a diffractive optical element, and the laser emits light through the collimator lens and the diffractive optical element to the surface of the test object.

3. The DToF distance sensor system of claim 1, wherein the optical element comprises a diffuser, and the laser emits light through the diffuser to the surface of the test object.

4. The DToF distance sensor system of claim 1, wherein the laser is a vertical cavity surface emitting laser.

5. The DToF distance sensor system of claim 1, wherein the detector is a photodetector.

6. The DToF distance sensor system of claim 1, wherein the receiving end further comprises a lens, and the reflected light from the surface of the test object passes through the lens and then illuminates the DToF sensor.

7. The DToF distance sensor system of claim 1, wherein the DToF sensor surface is provided with a filter layer.