CN217305521U - Laser module and image acquisition equipment - Google Patents

Abstract

The utility model provides a laser instrument module and image acquisition equipment belongs to laser instrument technical field. The laser module comprises a laser, a DOE and a detection circuit. The DOE is located on the light exit side of the laser. The detection circuit has ITO, and the ITO is plated on the DOE. The detection circuit is electrically connected with an enable terminal of the laser, and the detection circuit is configured to output a high-level signal in an ITO undamaged state and output a low-level signal in an ITO damaged state. Since ITO is plated on the DOE, when the DOE is damaged, ITO is damaged at the same time. Like this, when DOE damages, because ITO's damage, detection circuitry can output low level signal immediately, and under low level signal's effect, the laser instrument can close immediately to, avoided the direct outgoing of the laser that the laser instrument sent, improved the security of laser instrument module.

Description

Laser module and image acquisition equipment

Technical Field

The utility model relates to a laser instrument technical field, concretely relates to laser instrument module and image acquisition equipment.

Background

The depth map is an image or an image channel, and each pixel point of the depth map represents the distance between the image acquisition equipment and a shot object.

In the related art, an image capturing apparatus for generating a depth map includes a laser module and an image sensor. The laser module includes laser instrument and Diffraction Optical Element (DOE), and the DOE is located the light-emitting side of laser instrument, and the stronger laser of light intensity that the laser instrument sent is through DOE diffraction after, the light intensity weakens and becomes speckle structure light and outwards emits. The image sensor collects speckle structure light reflected by the shot object and analyzes the speckle structure light to obtain three-dimensional coordinate information of the shot object, so that a depth map is generated.

After DOE in the laser module damages, the stronger laser of light intensity that the laser instrument sent can direct outwards be emergent, and this makes the security of laser module lower.

SUMMERY OF THE UTILITY MODEL

The utility model provides a laser instrument module and image acquisition equipment can solve the technical problem that exists among the correlation technique, laser instrument module and image acquisition equipment's technical scheme as follows:

in a first aspect, the present disclosure provides a laser module comprising a laser, a Diffractive Optical Element (DOE), and a detection circuit;

the DOE is positioned on the light-emitting side of the laser;

the detection circuit has Indium Tin Oxide (ITO), and the ITO is plated on the DOE;

the detection circuit is electrically connected with an enabling end of the laser, and is configured to output a high-level signal to the enabling end in the undamaged ITO state and output a low-level signal to the enabling end in the damaged ITO state.

In one possible implementation, the detection circuit includes a power supply, the ITO, and a resistor;

the power with the first end electricity of ITO is connected, the second end of ITO with the enable end electricity of laser instrument is connected, and with the first end electricity of resistance is connected, the second end ground connection of resistance.

In one possible implementation, the voltage of the power supply is greater than 1.8V and less than 5V.

In one possible implementation, the voltage of the power supply is 3.3V.

In one possible implementation, the laser module further includes a controller;

the controller is electrically connected with an enabling end of the laser, and is configured to report state information indicating that the DOE is abnormal when the high-level signal is received.

In one possible implementation, the controller has a General Purpose Input Output (GPIO), and the GPIO is electrically connected to an enable terminal of the laser.

In one possible implementation, the laser module further includes an analog-to-digital converter;

the controller is electrically connected with the enabling end of the laser through the analog-to-digital converter.

In one possible implementation, the controller has an I2C (Inter-Integrated Circuit) interface;

the enabling end of the laser is electrically connected with the input end of the analog-to-digital converter, and the output end of the analog-to-digital converter is electrically connected with the I2C interface.

In one possible implementation manner, the laser comprises a driving chip and a light emitting diode, wherein the driving chip is provided with the enabling end;

the driving chip is electrically connected with the light emitting diode and is configured to stop driving the light emitting diode to emit light when the enabling end receives a low level signal.

In a second aspect, the present disclosure provides an image capturing apparatus having a laser module as defined in any one of the first aspects.

The technical scheme provided by the disclosure at least has the following beneficial effects:

the present disclosure provides a laser module, laser module include laser instrument, DOE and detection circuitry, and detection circuitry has the ITO, and the ITO plating is on DOE. The detection circuit is electrically connected with an enable end of the laser, and the detection circuit is configured to output a high-level signal in an ITO undamaged state and output a low-level signal in an ITO damaged state.

Since ITO is plated on the DOE, when the DOE is damaged, ITO is damaged at the same time. Like this, when DOE damages, because ITO's damage, detection circuitry can output low level signal immediately, then the laser instrument can close immediately to, avoided the direct outgoing of laser that the laser instrument sent, improved the security of laser instrument module.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. In the drawings:

fig. 1 is a schematic diagram of an image capturing device provided in an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a laser module according to an embodiment of the disclosure;

fig. 3 is a schematic diagram of a related circuit of a laser module according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of a related circuit of a laser module according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram of a related circuit of a laser module according to an embodiment of the present disclosure.

Description of the figures

01. A laser module 02 and an image sensor;

1. the device comprises a laser 11, a driving chip 111, an enabling end 12 and a light emitting diode;

2、DOE；

3. a detection circuit 31, a power supply 32, ITO 33 and a resistor;

4. controller, 41, GPIO, 42, I2C interface;

5. an analog-to-digital converter.

With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

The terminology used in the description of the embodiments of the present disclosure is for the purpose of describing the embodiments of the present disclosure only and is not intended to be limiting of the present disclosure. Unless otherwise defined, technical or scientific terms used in the embodiments of the present disclosure should have the ordinary meaning as understood by those having ordinary skill in the art to which the present disclosure belongs. The use of "first," "second," and similar terms in the description and claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes. "plurality" means two or more unless expressly limited otherwise.

Computer Vision (CV) is a science for researching how to make a machine "look", and more specifically, it refers to using a camera and a Computer to replace human eyes to perform machine Vision such as identifying and measuring objects, and further performing graphics processing, so that the Computer processing becomes an image more suitable for human eyes to observe or transmitting to an instrument to detect. As a scientific discipline, computer vision research-related theories and techniques attempt to build artificial intelligence systems that can capture information from images or multidimensional data. Computer vision technologies generally include image processing, image Recognition, image semantic understanding, image retrieval, Optical Character Recognition (OCR), video processing, video semantic understanding, video content/behavior Recognition, three-dimensional object reconstruction, 3D technologies, virtual reality, augmented reality, synchronous positioning, map construction, and the like, and also include common biometric Recognition technologies.

In 3D computer graphics and computer vision, a depth map is an image or image channel that contains information about the distance from the surface of the object being photographed to a viewpoint. Each pixel point of the depth map represents the distance between the image acquisition device and the photographed object, and is usually represented by 16 bits, and the unit is millimeter. The method is generally used for living body detection and auxiliary contrast identification in face brushing payment.

In the related art, as shown in fig. 1, an image capturing apparatus for generating a depth map includes a laser module 01 and an image sensor 02.

The laser module 01 includes a laser and a Diffractive Optical Element (DOE), and the DOE is located on the light emission side of the laser. After laser with strong light intensity emitted by the laser is diffracted by the DOE, the light intensity is weakened and becomes speckle structure light to be emitted outwards. Wherein, the speckle structure light is lattice light arranged according to a certain structural rule.

The image sensor 02 collects speckle structure light reflected back by the object to be photographed, and analyzes the speckle structure light according to the triangulation principle to obtain three-dimensional coordinate information of the object to be photographed, thereby generating a depth map.

After the DOE in the laser module 01 is damaged, laser emitted by the laser can be directly emitted outwards, and if the directly emitted laser is emitted into human eyes in a close distance, danger can occur, so that the safety of the laser module 01 is low.

In order to improve the safety of the laser module 01, in the related art, a distance sensor is used for detecting an object, and when the object is detected to be too close to the laser module 01, the laser is turned off so as to protect human eyes.

However, the distance sensor in the related art cannot distinguish whether the distance sensor is a human eye or a non-human eye, and if the distance between objects is too close, the laser is triggered to be turned off, and in some scenes, the user experience is influenced due to misjudgment. Moreover, according to the scheme, when the DOE is damaged, if no object is too close to the laser module 01, the laser cannot be immediately turned off, and therefore the protection level is low.

In view of the above technical problem, the embodiments of the present disclosure provide a laser module, as shown in fig. 2 and 3, which includes a laser 1, a DOE2, and a detection circuit 3. DOE2 is located on the light exit side of laser 1. The detection circuit 3 has Indium Tin Oxide (ITO) 32, and ITO32 is plated on the DOE 2. The detection circuit 3 is electrically connected to the enable terminal 111 of the laser 1, and the detection circuit 3 is configured to output a high-level signal to the enable terminal 111 in a state where the ITO32 is not damaged, and to output a low-level signal to the enable terminal 111 in a state where the ITO32 is damaged.

The laser 1 is used to emit laser light to the outside. The laser 1 has an enable terminal 111, and when the level signal at the enable terminal 111 is a high level signal, the laser 1 is in an operable state, and when the level signal at the enable terminal 111 is a low level signal, the laser 1 is immediately turned off.

The DOE2 generally adopts a micro-nano etching process to form diffraction units distributed in two dimensions, and each diffraction unit can have a specific morphology, a specific refractive index and the like so as to finely adjust and control the laser wave front phase distribution. The laser light is diffracted after passing through each diffraction unit and interferes at a certain distance (usually infinity or the focal plane of the lens) to form a specific light intensity distribution.

The detection circuit 3 is used to control the laser 1 to be turned on and off by changing the level signal of the enable terminal 111 of the laser 1. The detection circuit 3 is provided with ITO32, and the ITO32 is a mixture, is a transparent brown film or a yellow-to-gray block, is generally formed by mixing 90% of In2O3 and 10% of SnO2, and is mainly used for manufacturing liquid crystal displays, flat panel displays, plasma displays, touch screens, electronic paper, organic light emitting diodes, solar cells, antistatic coatings, Electromagnetic Interference (EMI) shielding transparent conductive coatings, various optical coatings and the like. ITO32 is closely attached to DOE2, and since the thickness of ITO32 is um level, when DOE2 is damaged, ITO32 is also damaged simultaneously. In some examples, ITO32 is plated on the light-in side of DOE2, and in other examples, ITO32 is plated on the light-out side of DOE 2.

According to the technical scheme provided by the embodiment of the disclosure, when the DOE2 is damaged, the ITO32 can be synchronously damaged, so that when the DOE2 is damaged, the detection circuit 3 can immediately output a low-level signal due to the damage of the ITO32, and then the laser 1 can be immediately closed, so that the direct emission of laser emitted by the laser 1 is avoided, and the safety of the laser module is improved.

The embodiment of the present disclosure does not limit the specific implementation manner of the detection circuit 3, and provides a possible implementation manner as follows:

in some examples, as shown in any of fig. 3-5, detection circuit 3 includes power supply 31, ITO32, and resistor 33. The power supply 31 is electrically connected to the first terminal of the ITO32, the second terminal of the ITO32 is electrically connected to the enable terminal 111 of the laser 1 and to the first terminal of the resistor 33, and the second terminal of the resistor 33 is grounded.

The voltage U1 of the level signal at the enable terminal 111 of the laser 1 is U × R2/(R1+ R2), where U is the voltage of the power supply 31, R1 is the resistance value of the ITO32, and R2 is the resistance value of the resistor 33.

In the undamaged state of the DOE2, the ITO32 is also undamaged, the resistance value of R1 is normal, the U1 is high, and the laser 1 is in a state of being able to operate normally. In the DOE2 failure state, if the ITO32 is also simultaneously broken, the ITO32 is equivalent to an open circuit, or if the resistance value R1 of the ITO32 becomes very large, the U1 becomes 0 or approaches 0, and becomes low, and the laser 1 is immediately turned off.

According to the technical scheme provided by the embodiment of the disclosure, by setting the detection circuit 3, when the DOE2 is damaged, the laser 1 can be immediately closed, and pure electrical behavior in protection is not required to be judged by software, so that zero time delay can be realized, and the highest-level laser protection is realized.

In addition, the whole detection circuit 3 has extremely simple structure, strong realizability and low realization cost.

The power supply 31 may be an original power supply in the image capturing device, or may be a power supply specially added to improve the safety of the laser module, which is not limited in the embodiment of the present disclosure.

The specific value of the voltage U of the power supply 31 is not limited in the embodiments of the present disclosure, and in some examples, the voltage of the power supply 31 is greater than 1.8V and less than 5V. Illustratively, the voltage of the power supply 31 is 3.3V.

In order to report the status information of the laser module, in some examples, as shown in fig. 4 and fig. 5, the laser module further includes a controller 4, the controller 4 is electrically connected to the enable terminal 111 of the laser 1, and the controller 4 is configured to report the status information indicating that the DOE2 is abnormal when receiving a high-level signal.

When the controller 4 receives a high signal, it indicates that the ITO32 and DOE2 are broken and that the laser 1 has been turned off. At this time, in order to facilitate the staff to maintain the laser module in time, the controller 4 may report status information indicating that the DOE2 is abnormal.

When the controller 4 receives the low level signal, the controller 4 may report state information for indicating that the DOE2 is normal, or may not report the state information because the laser module is in a normal state.

The embodiment of the present disclosure does not limit the manner in which the controller 4 detects the high-level signal, and in some examples, as shown in fig. 4, the controller 4 has a General Purpose Input Output (GPIO) 41, and the GPIO41 is electrically connected to the enable terminal 111 of the laser 1.

When the level signal detected by the GPIO41 is higher than a certain level threshold, the detected level signal is determined to be a high level signal, and when the level signal detected by the GPIO41 is lower than a certain level threshold, the detected level signal is determined to be a low level signal.

Since the GPIO41 is a widely used interface in electronic devices, the laser module provided by the embodiments of the present disclosure is easier to implement by using the GPIO 41.

In other examples, as shown in fig. 5, the laser module further includes an analog-to-digital converter 5, and the controller 4 is electrically connected to the enable terminal 111 of the laser 1 through the analog-to-digital converter 5.

The analog-to-digital converter 5 is configured to convert an analog signal of the enable terminal 111 of the laser 1 into a digital signal, and output the digital signal to the controller 4, so that the controller 4 can determine whether the signal is a high level signal or a low level signal according to a specific value of the level signal of the enable terminal 111.

The embodiment of the present disclosure does not limit the manner of electrical connection between the controller 4 and the analog-to-digital converter 5, and in some examples, as shown in fig. 5, the controller 4 has an I2C (Inter-Integrated Circuit) interface 42, the enable terminal 111 of the laser 1 is electrically connected to the input terminal of the analog-to-digital converter 5, and the output terminal of the analog-to-digital converter 5 is electrically connected to the I2C interface 42.

In some examples, the controller 4 is a master chip in the image capture device.

In the following, a possible implementation of the laser 1 is provided:

in some examples, as shown in fig. 3-5, the laser 1 includes a driving chip 11 and a light emitting diode 12, the driving chip 11 having an enable terminal 111. The driving chip 11 is electrically connected to the light emitting diode 12.

The driving chip 11 is configured to stop driving the light emitting diode 12 to emit light when the enable terminal 111 receives a low level signal.

When the enable terminal 111 receives the high level signal, the driving chip 11 drives the light emitting diode 12 to be in a working state, that is, only when the enable terminal 111 receives the high level signal, the laser 1 can work.

The embodiment of the present disclosure further provides an image capturing apparatus, as shown in fig. 1, the image capturing apparatus has any one of the laser modules 01 described above.

In some examples, as shown in fig. 1, the image capturing apparatus includes a laser module 01 and an image sensor 02, the laser module 01 is configured to emit speckle structure light to the outside, and the image sensor 02 is configured to capture the speckle structure light reflected back by the photographed object and resolve three-dimensional coordinate information of the photographed object, so as to generate a depth map.

In some examples, the image capture device provided by embodiments of the present disclosure is a three-dimensional image capture device.

In some examples, the image capture device provided by embodiments of the present disclosure is a face brushing device.

The above description is only for the purpose of illustrating the preferred embodiments of the present disclosure and is not to be construed as limiting the present disclosure, but rather as the subject matter of the present disclosure is to be accorded the full scope and breadth of the present disclosure.

Claims (10)

1. A laser module is characterized by comprising a laser (1), a diffraction optical element DOE (2) and a detection circuit (3);

the DOE (2) is positioned on the light-emitting side of the laser (1);

the detection circuit (3) has indium tin oxide, ITO, (32), and the ITO (32) is plated on the DOE (2);

the detection circuit (3) is electrically connected with an enable terminal (111) of the laser (1), and the detection circuit (3) is configured to output a high-level signal to the enable terminal (111) in an undamaged state of the ITO (32) and output a low-level signal to the enable terminal (111) in a damaged state of the ITO (32).

2. The laser module according to claim 1, characterized in that the detection circuit (3) comprises a power supply (31), the ITO (32) and a resistor (33);

the power supply (31) is electrically connected with a first end of the ITO (32), a second end of the ITO (32) is electrically connected with an enabling end (111) of the laser (1) and is electrically connected with a first end of the resistor (33), and a second end of the resistor (33) is grounded.

3. The laser module according to claim 2, wherein the voltage of the power supply (31) is greater than 1.8V and less than 5V.

4. A laser module according to claim 3, characterized in that the voltage of the power supply (31) is 3.3V.

5. The laser module according to any one of claims 1-4, further comprising a controller (4);

the controller (4) is electrically connected with an enabling terminal (111) of the laser (1), and the controller (4) is configured to report state information indicating that the DOE (2) is abnormal when the high-level signal is received.

6. The laser module according to claim 5, wherein the controller (4) has a general purpose input output interface GPIO (41), and the GPIO (41) is electrically connected with an enable terminal (111) of the laser (1).

7. A laser module according to claim 5, characterized in that it further comprises an analog-to-digital converter (5);

the controller (4) is electrically connected with an enabling end (111) of the laser (1) through the analog-to-digital converter (5).

8. The laser module according to claim 7, characterized in that the controller (4) has an I2C interface (42);

the enable end (111) of the laser (1) is electrically connected with the input end of the analog-to-digital converter (5), and the output end of the analog-to-digital converter (5) is electrically connected with the I2C interface (42).

9. The laser module according to any of claims 1-4, characterized in that the laser (1) comprises a driver chip (11) and a light emitting diode (12), the driver chip (11) having the enable terminal (111);

the driving chip (11) is electrically connected with the light emitting diode (12), and the driving chip (11) is configured to stop driving the light emitting diode (12) to emit light when the enable terminal (111) receives a low level signal.

10. An image acquisition device, characterized in that the image acquisition device has a laser module according to any one of claims 1-9.

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