CN207866191U - Optical scanner and sorting equipment - Google Patents

Abstract

The utility model is related to optical scanners and sorting equipment.A kind of optical scanner for being used in sorting equipment, including at least one light source；At least one detector；It is arranged to the mirror that the light from least one light source is directed to object to be scanned and the light from object to be scanned is directed to at least one detector；And the unit for making mirror resonate.The purpose of the one side of the utility model is to provide a kind of optical scanner.The one side of the utility model has technical effect that optical scanner according to the present utility model has the advantages that such as compact dimensioning, low cost, due to not having dead time and with more information and due to not having moving parts and with high reliability.

Description

Optical scanner and sorting equipment

Technical field

The utility model is related to the scanners for sorting.Particularly, the utility model is directed in sorting equipment The optical scanner used.

Background technology

Laser scanner currently used for sorting uses polygon scanner.Polygon scanner, which uses, has deflection laser Beam is to scan the high speed rotation polygon prism in multiple faces of product.Each face is reflective.Current polygon scanner exists Many the shortcomings that may influencing scanner performance.For example, due to the variation of coating, the reflectivity in face is for certain in different sides Wavelength possible dramatically different up to 10% to 15%.

Another problem is, for wide wave-length coverage, the coating of mirror is typically shielded aluminium.Although such as protected Gold or other coatings of silver coating also can be used, but they can for the polygon speed (speed) of the bonding about coating It can be restricted.

Since polygon prism is scanned rotate at high speed, polygon scanner consumes high power, and therefore needs By the high power motor of large driven current density.Polygon prism is also high cost component, passage at any time, due to high speed rotary motion, Polygon prism may be crushed.Which increase cost and shorten the service life of scanner.

Another problem of polygon scanner is available scanning angle and is generally significantly less than actual scanning angle.Example Such as, 72 degree of the polygon scan in 10 faces, wherein having only used about 40 degree.Therefore, polygon scanner has between scans Dead time.

Accordingly, it is desirable to provide a kind of optical scanner overcoming disadvantages mentioned above at least partly.

Utility model content

The purpose of the one side of the utility model is to provide a kind of optical scanner.

According to the utility model, the optical scanner for being used in sorting equipment, including at least one light are provided Source, at least one detector are arranged to be directed to object to be scanned from the light of at least one light source and will come to wait for The light of sweep object is directed to the mirror of at least one detector and the unit for making mirror resonate.

Mirror is preferably plane.For making the unit that mirror resonates may include the torque rod that mirror is installed to.

For making the unit that mirror resonates that can also include the unit for making torque rod resonate.

At least one light source can be laser.At least one light source can be Light-emitting diode LED.At least one light source It can be super continuum source.

Optical scanner can also include at least one beam splitter, so that transmitting is detached with the light detected.

Additionally provide the sorting equipment for including at least one optical scanner as described herein.

The utility model provides a kind of resonance scanner, and resonance scanner utilizes resonance mirror by the source optical transport of transmitting To object to be detected and by reflection and scattering optical transport to detector, it is possible thereby in two directions sampled data with Just two parallel scannings that interweave are combined as.

The one side of the utility model has technical effect that optical scanner according to the present utility model has such as Compact dimensioning, low cost, due to there is no dead time and with more information and due to there is no a moving parts and with height The advantages of reliability.Scanner only has single face, to effectively eliminate face to the reflectivity changes between face.The scanner Also allow that light loss is reduced to only 1% using broadband dielectric coating, wherein wavelength is depended on, shielded aluminized coating loss Up to 15% reflectivity.The scanner is low-power consumption.For example, polygon scanner needs startup power and the operation of 192W The power of 48W under state.In contrast, the scanner of the utility model needs very small power to operate, for example, being less than 5W Power.

Description of the drawings

Fig. 1 is schematically illustrating for the scanner of one embodiment according to the present utility model.

Fig. 2 is scanner mirror and its installs the expression of one embodiment of equipment.

Fig. 3 a show the sinusoidal motion of scanner according to the present utility model；Fig. 3 b scanners according to the present utility model Angular speed；The angular acceleration of Fig. 3 c scanners according to the present utility model.

Fig. 4 shows the scan pattern to give scan frequency to product.

Fig. 5 shows the visualization by the digitized original signal of oscillograph for carrying out self-detector.

Fig. 6 shows the scan pattern to target product.

Fig. 7 a show the parallel sweep pattern of the first subset of the scan pattern as Fig. 6.

Fig. 7 b show the parallel sweep pattern of the second subset of the scan pattern as Fig. 6.

Specific implementation mode

The utility model is described with reference to the drawings.Fig. 1 is schematically illustrating for one embodiment of the utility model.It sweeps It includes light source 2 and 3, beam splitter 4,5 and 9, scanning mirror 6, lens 8 and detector 10 and 11 to retouch instrument 1.

Light source 2 and 3 has different wavelength, and the light emitted from it is combined into single light beam to be directed into scanning mirror 6 On.Each in light source 2,3 can be laser or light emitting diode (LED).Laser can be continuous output laser Device.At least one of light source 2 and 3 can be super continuum source.Beam splitter 5 is by polarization state rather than passes through wavelength Or intensity detaches the polarization beam apparatus of light.Therefore, the light for being only in specific polarization state is just transmitted to scanning mirror 6.It sweeps The oscillation of mirror 6 is retouched so that object 7 can be scanned by incident beam.Object 7 can be the one or more products to be sorted.Object 7 Can also be image or object including analog or digital pattern.Incident light is reflected or is scattered by object 7, and is reflected/scattered Light be then guided via scanning mirror 6 to be detected by detector 10.

As shown in Fig. 2, scanning mirror 6 may be mounted on the end of torque rod.Compared with the polygon prism with multiple faces, sweep It is that only there are one the plane mirrors in face for tool to retouch mirror 6, which reduce manufacture complexity and cost and ensures there is individual reflection rate Uniform coating.The scanning mirror 6 of Fig. 2 of one embodiment according to the present utility model is mounted on the end of torque rod, torque rod It is designed to vibrate with fixed frequency.Scanner does not have moving parts, in this sense, avoids rubbing between component It wipes.Due to friction often leads to breakage, the stability and reliability of scanner are improved.

One embodiment according to the present utility model, scanner only scan correct angle, and correct angle can be by being used for The setting amplitude of inspection is predefined plus small added angle, so that having fluorescence detector for scanning starting.Due to The movement of scanning mirror, when scanner moves back to scanning starting, data can also be recorded, to eliminate dead time.

One embodiment according to the present utility model and with reference to figure 3a, resonance scanner is opened around center (0 °) The variation of Angle Position in the time range for the cycle of oscillation begun is in a manner of sinusoidal (as unit of degree).Resonance scan The corresponding variation of angular speed of the instrument within same cycle of oscillation is as shown in Figure 3b.Angle of the resonance scanner within same cycle of oscillation The corresponding variation of acceleration is as shown in Figure 3c.

One embodiment according to the present utility model, Fig. 4 show the scan pattern to object, which can be used for To give the mobile product that scan frequency is checked.The product is moved with the speed of 2m/s in the direction perpendicular to the scan direction It is dynamic.It the scan position that is recorded in two cycles of oscillation to mobile product and is shown in FIG. 4.

It is assumed that the sinusoidal motion of the scanning mirror of resonance scanner is as shown in Figure 3b, the speed of the laser facula at product The significant changes between the center and peripheral of scanning.If data are sampled with fixed frequency, sampling every time is covered Distance or range will be different depending on the position relative to scanning center.

Therefore, the sampled data for carrying out self-detector is moved to edge from center also with laser, is returned to separately by center One edge simultaneously changes back to center.Fig. 5 provides the example of test result, show the sampled signal of detector with Scanning direction changes its intensity.The intensity of the peak instruction detector signal of upside.The direction of the block wave instruction scanning of downside.

Another embodiment according to the present utility model can adopt data in the both direction of the oscillation of mirror Sample, this can be combined into two parallel scannings that interweave, as shown in Figure 6.Importantly, scanning is parallel, with phase Deng rectangle or square pixel effect.The product for flowing through scanning area provides vertical movement, and mirror provides level Movement.Sorter can capture the A sweep (A1, A2, A3, A4) in diagram, and build an image as shown in Figure 7a, simultaneously B-scan (B1, B2, B3, B4) forms the second image as shown in Figure 7b.Merging image has the effect of dual sampled images.Figure There are slight angle differences as between, but difference is less than the size of pixels tall or pixel, therefore opposite unobvious.It is this The imaging sampling technique enabled by resonance scanner is impossible for polygon scanner, and more scannings are utilized Time.

When word " comprising " and word " have/including " are herein with reference to when the utility model is used, for specifying The presence of the feature, integer, step or component of statement, but it is not excluded for one or more of the other feature, integer, step, component Or combinations thereof presence or addition.

It will be recognized that for the sake of clarity, the utility model described in the context of separate embodiments Certain features can also combine offer in single embodiment.Comparatively, for simplicity, in the context of single embodiment Described in the utility model various features can also be provided separately or with any suitable sub-portfolio provide.

Claims (9)

1. a kind of optical scanner, for being used in sorting equipment, which is characterized in that including：

At least one light source；

At least one detector；

Mirror is arranged to that object to be scanned will be directed to from the light of at least one light source and will wait sweeping from described The light for retouching object is directed at least one detector；And

Unit for making mirror resonate.

2. optical scanner as described in claim 1, which is characterized in that the unit for wherein being used to that mirror to be made to resonate includes torsion Bar, mirror are installed to torque rod.

3. optical scanner as claimed in claim 2, which is characterized in that the unit for wherein being used to that mirror to be made to resonate further includes using In the unit for making torque rod resonate.

4. optical scanner as described in any one of the preceding claims, which is characterized in that wherein described at least one light source It is laser.

5. optical scanner as described in claim 1, which is characterized in that wherein described at least one light source is light emitting diode LED。

6. optical scanner as described in claim 1, which is characterized in that wherein described at least one light source is super continuous spectrums light Source.

7. optical scanner as described in claim 1, which is characterized in that further include at least one beam splitter, so that transmitting It is detached with the light detected.

8. optical scanner as described in claim 1, which is characterized in that the wherein described mirror is plane mirror.

9. a kind of sorting equipment, which is characterized in that swept including at least one optics as described in any one of the preceding claims Retouch instrument.