A kind of optical power detection apparatus and method of TOF light projection moduleTechnical field
The present invention relates to the tests of the optical power of the testing field of TOF light projection module more particularly to a kind of pair of TOF light projectionDevice and method.
Background technique
The principle of TOF technology is exactly to use a transmitter to object emission light, such as laser, infrared light, then passed by oneSensor receives reflected optical signal, then calculates distance between object and mobile phone further according to the light round-trip time, fromAnd it can determine reflection point.When the laser of transmitting is enough, all points can be linked to be a three-dimensional surface.Existing 3DRecognition of face camera shooting first-class product has mostly used TOF technology, in identification process, needs to project infrared light, laser etc. to face, isThe safety of human eye, it is necessary to ensure that need the optical power to TOF light projection module institute projection light to detect, to guarantee in human eyeIn safe range.
Summary of the invention
The purpose of the present invention is to provide the optical powers of a kind of pair of TOF light projection module to carry out accurate, reasonable detection, reallyProjected light is protected in safety range of human eye.
The present invention provides a kind of optical power detection method of TOF light projection module, it is characterised in that: the following steps are included:
It is shot by camera and identifies TOF light projection module institute's projection light light most bright after diffusion barrier is imagedSpot；
Calculate the horizontal sextant angle θ b of the most bright hot spot and angle theta a along Z axis；
Horizontal rotation angle by middle control rotating platform regulating optical power detection meter is extremely consistent with θ b；
By the angle of the Z axis of angle rotating mechanism regulating optical power detection meter it is consistent with θ a after, then detect TOF light projectionThe optical power of module institute projection light.
It further, further include judging whether detected optical power exceeds set value；Beyond the step of then alarming.
The present invention also provides a kind of optical power detection apparatus of TOF light projection module, it is characterised in that: is displaced mould including XYGroup, the middle control rotating platform connecting with XY displacement mould group control the angle rotating mechanism and be set to angle that rotating platform is connect with middleThe optical power spent on rotating mechanism detects meter；Further include diffusion barrier, and is located at diffusion barrier camera；The camera is for clappingIt takes the photograph and identifies TOF light projection module institute's projection light hot spot most bright after diffusion barrier is imaged；The middle control rotating platform energyThe horizontal rotation angle of enough regulating optical power detection meters is extremely consistent with the horizontal sextant angle θ b of most bright hot spot；The angle whirlerThe angle that structure is capable of the Z axis of regulating optical power detection meter is consistent with the angle theta a along Z axis of most bright hot spot.
Further, which includes angle installation riser, is fixedly mounted on angle installation riser first sideAngular adjustment motor, the arc guide rail that is set in the angle installation riser second side opposite with first side, angle it is slidingBlock and spill spin block, described spill spin block one end are connect with the rotor of angular adjustment motor, and the other end is led by angle sliding block with circular arcRail is flexibly connected, and the optical power detection meter is fixedly installed on spill spin block.
Further, the angle sliding block is equipped with directive wheel, and the spill spin block is equipped with the line channel extended from inside to outside,The line channel is adapted to directive wheel.
Further, the angle rotating mechanism further includes L-type block, and longitudinal portion of the L-type block is fixed at spill spin blockSide far from angle installation riser direction, optical power detection meter are mounted on the transverse part of L-type block.
Further, the XY displacement mould group includes mould group fixed plate, the Y-axis sliding rail for being fixed on mould group fixed plate bottom surface, Y-axisSliding block, the Y-axis servo motor for driving Y-axis sliding block to move along Y-axis sliding rail；It is fixed at the X-axis pad of Y-axis slider bottomBlock, the X-axis slide rail that X-axis cushion block bottom surface is set, X-axis slide block, the X-axis servo electricity for driving X-axis slide block to move along X-axis slide railMachine.
It further, further include mast-up, middle control rotating platform is fixedly connected by the mast-up with X-axis slide block.
Further, the camera be set to angle installation riser on the second side along Z axis downward, the diffusion barrier is fixedSet on the lower section of camera.
Detailed description of the invention
Fig. 1 is the overall structure diagram of device in certain preferred embodiment.
Fig. 2 is that the camera of device shoots schematic diagram；
Fig. 3 is the schematic diagram that most bright hot spot is identified after the camera of device is shot；
Fig. 4 is the horizontal sextant angle schematic diagram of most bright hot spot.
Specific embodiment
Certain preferred embodiment of the invention is described further below in conjunction with drawings and embodiments.
As shown in Figure 1, in certain preferred embodiment, a kind of optical power detection apparatus of TOF light projection module, including XY displacementMould group 1, middle control rotating platform 2, optical power detection meter 4 and angle rotating mechanism.Wherein, it includes mould group that XY is displaced mould group 1 againFixed plate 13, the Y-axis sliding rail 112 for being fixed on 13 bottom surface of mould group fixed plate, Y-axis sliding block 113, for driving Y-axis sliding block 113 along YThe mobile Y-axis servo motor 111 of axis sliding rail 112；It is fixed at the X-axis cushion block 124 of 113 bottom of Y-axis sliding block, is arranged in X-axisX-axis slide rail 122, X-axis slide block 123, the X-axis for driving X-axis slide block 123 to move along X-axis slide rail 122 of 124 bottom surface of cushion block are watchedTake motor 121.Middle control rotating platform 2 is fixedly connected by a mast-up 14 with X-axis slide block 123, can be in Y-axis servo motor111 and under X-axis servo motor 121 drives, adjust the X of control rotating platform 2, Y axis coordinate position in entire.Middle control rotating platform 2With the rotating part that can do X/Y plane horizontal rotation under middle control 2 motor internal of rotating platform driving.
Angle rotating mechanism includes angle installation riser 31, the angle for being fixedly mounted on 31 first side of angle installation riserAdjust motor 32, the arc guide rail 33 being set in the second side opposite with first side of angle installation riser 31, spill spin block35 and L-type block 352.Angle installation riser 31 is connect by a cross connecting plate 21 with the rotating part of middle control rotating platform 2.RotationBlock 35 is arranged in parallel with angle installation riser 31, and the shaft on 32 rotor of angular adjustment motor and spill spin block 35 are fixedly connected on oneIt rises, spill spin block 35 can rotate under the effect of angular adjustment motor 32.Angle rotating mechanism further includes an angle sliding block 34, rotationThe one end of block 35 far from angular adjustment motor 32 is slidably connected by angle sliding block 34 with arc guide rail 33.Preferably, angle is slidingBlock 34 is equipped with directive wheel 341, and spill spin block 35 is equipped with the line channel 351 extended from inside to outside.Longitudinal portion of L-type block 352 is solidSide of the spill spin block 35 far from 31 direction of angle installation riser is set calmly, and optical power detection meter 4 is mounted on the cross of L-type block 352To portion.When work, XY displacement mould group 1 is responsible for the position in the direction XY of regulating optical power detection meter 4, and middle control rotating platform 2 is responsible forAngle on regulating optical power detection 4 horizontal planes of meter；Angle rotating mechanism is responsible for adjusting the angle between all directions and Z axis.Wherein, when angle rotating mechanism works, spill spin block 35 is controlled by angular adjustment motor 32 and rotates required angle, rotary courseIn, the other end is led by angle sliding block 34 and the guiding of arc guide rail 33, the directive wheel 341 of angle sliding block 34 and the straight line of spill spin block 35It limits and is oriented to mutually between guide groove between slot 351, entire rotation process is made to realize effect smooth, stable, that error is small, andAnd prevent the shake of rotation process.In addition, angle installation riser 31 is on the second side, in the side of spill spin block 35, also along Z axisEquipped with camera 5, and the diffusion barrier 51 positioned at 5 lower section of camera.Product is projected by the camera 5 and diffusion barrier 51Light is taken pictures by imaging after diffusion barrier 51, and the placement position information of product is judged by taking pictures.
Preferably, it is equipped with locating part at the both ends of arc guide rail 33, to prevent the disengaging of angle sliding block 34.As an alternative,Optical power detection meter 4 can be other sensory packages of optical power test.
When being tested in conjunction with Fig. 2,3, the optical power detection apparatus of 4, TOF light projection module, first in mobile deviceCamera 5 is to the surface of TOF light projection module.The light projection of TOF light projection module is simultaneously imaged by diffusion barrier 51.Camera5 shooting diffusion barriers 51 are imaged, and most bright hot spot is then identified by software.Then the horizontal sextant angle θ of most bright hot spot is calculatedB, and the angle theta a along Z axis.The optical power detection meter 4 of the optical power detection apparatus of TOF light projection module is displaced by XYMould group is moved to the surface of TOF light projection module；Pass through the horizontal rotation of middle control 2 regulating optical power of rotating platform detection meter 4Angle keeps the level angle of optical power detection meter 4 identical as the horizontal sextant angle θ b of most bright hot spot；Pass through angle rotating mechanism tuneThe angle for saving the Z axis of optical power detection meter 4, keeps it identical as the angle theta a of the Z axis of most bright hot spot, finally detects optical powerAfter meter 4 is adjusted in place, the optical powers such as the light such as infrared light, laser that TOF light projection module is projected can be detected, be sentencedThe disconnected safety value for whether exceeding human eye.In this way, determining the angle for most projecting light distribution by force by the most light spot for first finding out projectionThen degree adjusts the detection angles of optical power detection meter 4 again, can accurately detect to the most strong optical power of projection light,Judge whether to efficiently solve the problems, such as that traditional detection error is big in safety range of human eye.