CN107608072A - A kind of optical scanner of image-scanning system - Google Patents
A kind of optical scanner of image-scanning system Download PDFInfo
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- CN107608072A CN107608072A CN201710916641.5A CN201710916641A CN107608072A CN 107608072 A CN107608072 A CN 107608072A CN 201710916641 A CN201710916641 A CN 201710916641A CN 107608072 A CN107608072 A CN 107608072A
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Abstract
The invention discloses a kind of optical scanner of image-scanning system, the fluorescence of collection is not required to by optical reflection film, avoid energy by light reflection module absorb and caused by signal to noise ratio lower the problem of so that image quality is preferable.It includes light beam generation module, light reflects module and light harvesting device assembly, light reflection module includes being used for by light reflection mirror that the scanning light beam reflects and the scan module for driving light reflection mirror to rotate, light harvesting device assembly includes optical collector and electrooptical device, optical collector, which has, is used for face Image Plate to collect the collection window for the fluorescence that Image Plate excites, the electrooptical device enters window with what the fluorescence collected for the collection window entered, the light harvesting device assembly also includes to make laser light and making the transflection mirror of fluorescent reflection, the transflection mirror is arranged between the light reflection mirror of the light reflection module and the collection window of the optical collector, the electrooptical device is in the reflected light path of the transflection mirror.
Description
Technical field
The present invention relates to computer X-ray photographic imagery field, particularly a kind of shadow recorded using laser to Image Plate
As the optical scanner for the system that information is scanned.
Background technology
Computer X-ray photography（Computed X-ray Radiography, CR）It is strong to have been widely used for medical treatment
Health field, relative to traditional X-ray technology, it, which is mainly characterized by, employs flexible, erasable Image Plate
（Imaging Plate, IP）Instead of silver halide film, and available computer storage and display image information.
X ray penetrates object and is irradiated on the Image Plate containing Optical-excitation fluorescent powder, can produce a frame latent image（Latent
Image）And it is stored in Image Plate.When the certain wavelength of use（600-700nm）Laser irradiation when, Image Plate can inspire spy
Standing wave is grown（350-450nm）Fluorescence, its power distribution properties and latent image form are perfectly correlated, and these fluorescence are collected, changed
Into electric signal and digitize, so as to the two-dimensional digital image for being converted into store and transmitting by latent image.
Using the latent image characteristic of Image Plate, film making imaging can be carried out to tooth, compared with traditional film imaging method,
The advantages that CR technologies have image taking speed fast, and display dynamic range is wide, and slice, thin piece can be reused.Light as one of core component
Scanning system is learned, is related to the speed and picture quality of whole imaging process.
In the optical system of CR scanners, the image reading sides such as spot scan, line scanning and Surface scan can be typically used
Formula.Spot scan is exactly using a branch of convergence light scan-image plate, forms a scanning track, while at a certain time interval
（0.75μs）The fluorescence signal that collection laser facula inspires.Line scanning can gather the latent image of Image Plate line by line using line source
Information, the fluorescence signal then collected to every row decouple, and obtain the latent image information of each point.Surface scan can be understood as
It is exactly common shooting process, LASER Light Source is area source, and the fluorescence in whole image plate face inspired is by by largely sensing
The face battle array of device composition is collected into, and the image information of each pixel is obtained by the decoupling computation of complexity.
Either line scanning or Surface scan, are required for CCD（Charge-coupled Device）Or CMOS
（Complementary Metal Oxide Semiconductor）As image capture device, each photosensitive unit receives
The line signal for being from Image Plate（Line scans）Or face signal（Surface scan）, then divided again with certain space interval
Go out minimum display unit physically, by decoupling computation, obtain the latent image signal of each display unit.Such as to obtain high-resolution
Rate, the picture signal of high gray degree, it is necessary to which image capture device has enough photosensitive units and broad dynamic range
And accurate quick calculating process.
For from imaging mechanism, point, line, surface scanning is without essential difference, and the mode simply realized slightly has difference, especially
It is that line scanning and face surface sweeping realization principle and mode are substantially the same.Spot scan using previously described image capture device or
Person PMT（PhotoMultiplier Tube）, the latent image information of each point is directly read, therefore in theory can be more
Each pixel signal is accurately obtained, and then more can really react image information.
The spot scan mode used at present, there can be several different ways of realization again, typically mainly have：
Rotating mirror scan system
Tilting mirror surface sweeping system is the simplest from a structural point, relatively low to the rotating speed of servomotor（Prism scanning system
50%）；And because the symmetry in structure, velocity-stabilization type might as well；Light path only passes through primary event, and light loss is also small, is surveying
It is used widely in the fields such as amount, 3D imagings.But require extremely strict for processing and installation, which also limits it in precision
The application in scanning field.
Galvanometer scanning system
Galvanometer scanning system has obtained very extensive application on laser marking machine, typically can directly purchase this set system, both
1D scannings, which can be carried out, can also carry out 2D scannings, and Image Plate feeding module design comparison is flexible.For economy, mainly by
Required precision is formed on, the sweep speed linearity is only capable of reaching 99.9% or so, this precision and 5s for 20 μm of scanning light spot diameter
Sweep speed requirement for, be not met by requiring.
Prism scanning system
Prism scanning system structure is also relatively easy, and main parts size can be purchased directly（Some processes may need to customize）, and
And all relatively low is required to the processing and installation of pentaprism.Under the conditions of the price equal with galvanometer, the speed line of single servomotor
Property degree wants high an order of magnitude.
Described pentaprism scanning system is disclosed in the A1 of the patent US 2009/0267006 and B2 of US 6,599,014
（Hereinafter referred to as AB types）, the pentaprism scanning system of AB types is clearly disadvantageous for being designed with for light path, is primarily but not limited to body
Present fluorescence recovery loss is big, the collection of optical signal needs optical collector to be collected light beam, but due to the fluorescence of collection
Chief ray enters back into PMT after the pentaprism and support by centre, has a big chunk energy and is absorbed, so as to reduce letter
Make an uproar and compare, influence image quality.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide a kind of light-beam scanner of image-scanning system, wherein, receive
The fluorescence of collection is not required to by optical reflection film, avoid energy by light reflection module absorb and caused by signal to noise ratio lower the problem of, make
It is preferable to obtain image quality.
To reach above-mentioned purpose, a kind of technical scheme that the present invention uses for：
A kind of optical scanner of image-scanning system, including light beam generation module, light reflection module and light harvesting device assembly,
The light beam generation module includes laser and generates lens group for generating the light beam of scanning light beam, and the light reflects module
Including the light reflection mirror for the scanning light beam to be reflected and the scan module for driving the light reflection mirror to rotate, institute
Stating light harvesting device assembly includes optical collector and electrooptical device, and the optical collector, which has, is used for face Image Plate to collect image
The collection window for the fluorescence that plate excites, the electrooptical device have the entrance that the fluorescence collected for the collection window enters
Window, the light harvesting device assembly also include to make laser light and making the transflection mirror of fluorescent reflection, and the transflection mirror is arranged on
Between the light reflection mirror of the light reflection module and the collection window of the optical collector, the electrooptical device is located at institute
In the reflected light path for stating transflection mirror.
Preferably, the reflecting surface of the speculum is coated with the reflectance coating for being capable of reflected fluorescent light.
Preferably, the collection window of the optical collector has the relative front end nearer from the laser and swashed from described
The rear end of light device farther out, the section of front end are circular or ellipse, rear end for rectangle or round rectangle, and front-end and back-end it
Between seamlessly transit.
Preferably, the optical scanner also includes being arranged between the light reflection module and the light harvesting device assembly
F-theta lens groups, the F-theta lens groups include being used to produce the barrel distortion of light beam generation lens group relatively
Lens combination, the lens combination include aspherical mirror or at least three spherical lenses, and it is anti-that the transflection mirror is arranged on the light
Penetrate between the light reflection mirror of module and the F-theta lens groups or the F-theta lens groups and the optical collector
Between collection window.
It is highly preferred that the F-theta lens groups also include sleeve, the lens combination can be along the F-theta lens
The optical axis direction of group is movably in the sleeve.
Further, the sleeve can be movably arranged at along the direction of the optical axis perpendicular to the F-theta lens groups
On the scan module support of the scan module.
Further, what the light beam generation lens group included setting gradually is used for the light beam of the light beam of laser emitting
The angle of divergence, which is adjusted to one, to be shown to form the first lens of rotationally symmetrical taper light beam, for forming directional light to beam collimation
Second lens of beam and the 3rd lens for being focused on to light beam；Or, the light beam generation lens group includes what is set gradually
The first saturating of rotationally symmetrical taper light beam is formed for adjusting the beam divergence angle of the light beam of laser emitting to one to show
Mirror and the second lens for forming collimated light beam to beam collimation.
Preferably, the laser beam module is also included for setting the lens barrel of the light beam generation lens group and being used for
Light beam module bracket on scan module support, the lens barrel can movably be set along the optical axis of the laser beam module
It is placed in the light beam module bracket.
It is highly preferred that the light beam module bracket includes being used on the scan module support of image-scanning system
Body and the inner tube for connecting the lens barrel, the lens barrel can be movably arranged at along the optical axis of the laser beam module
In said inner tube, said inner tube can movably be arranged at the body along the direction of the optical axis perpendicular to the laser beam module
On.
It is highly preferred that the laser beam module is also including the light source base on the lens barrel, located at the light source
Laser mounting seat on pedestal, the laser are installed in the laser mounting seat, and the light source base can be along vertical
Movably it is located in the direction of the optical axis of the laser beam module on the lens barrel, the laser mounting seat can swash along described
The optical axis of light light beam module is movably in the light source base.
The present invention uses above-mentioned technical proposal, has the following advantages that compared with prior art：
By setting transflection mirror in the collection light path of fluorescence, and transflection mirror is arranged on the light reflection of the light reflection module
Between the collection window of mirror and the optical collector, the fluorescence of collection is reflected into PMT in transflection Jing Chu, without anti-by light
Penetrate module, avoid energy by light reflection module absorb and caused by signal to noise ratio lower the problem of so that image quality is preferable.
Brief description of the drawings
Accompanying drawing 1 shows a kind of structured flowchart of image-scanning system；
Accompanying drawing 2 shows a kind of three-dimensional structure diagram of optical scanner according to the present invention；
Accompanying drawing 3a shows the partial schematic diagram according to a kind of laser beam module of the invention before assembling；
Accompanying drawing 3b shows the partial schematic diagram in assembling according to a kind of laser beam module of the present invention；
Accompanying drawing 3c shows the partial schematic diagram according to a kind of laser beam module of the invention after assembling；
Accompanying drawing 4a shows a kind of structural representation of F-theta lens groups according to the present invention；
Accompanying drawing 4b shows a kind of minute surface schematic diagram of lens combination according to the present invention；
Accompanying drawing 5 shows the schematic diagram of F-theta lens groups；
Accompanying drawing 6a shows a kind of schematic diagram of light harvesting device assembly according to the present invention；
Accompanying drawing 6b shows the structural representation of a kind of the light harvesting device assembly and F-theta lens groups according to the present invention；
Accompanying drawing 7 shows the schematic diagram of light harvesting device assembly of the prior art；
Accompanying drawing 8 shows the schematic diagram of another light harvesting device assembly according to the present invention；
Accompanying drawing 9 shows the structural representation of another light harvesting device assembly and F-theta lens groups according to the present invention；
Accompanying drawing 10 shows the structural representation of the 4th kind of light harvesting device assembly and F-theta lens groups according to the present invention.
In above-mentioned accompanying drawing,
1st, laser beam module；101st, laser driving circuit；102nd, laser diode；103rd, O-ring；104th, laser is installed
Seat；104a, first step hole；104b, First terrace；104c, second step hole；104d, second step face；104e, the 3rd
Stepped hole；105th, light source base；105a, the first inclined-plane；106th, lens barrel；107th, the first jackscrew；107a, the second inclined-plane；108th,
One wedge；108a, the second inclined-plane；109th, stage clip；110th, body；111st, inner tube；111a, the 3rd inclined-plane；112nd, the second jackscrew；
112a, the 4th inclined-plane；113rd, the second wedge；113a, the 4th inclined-plane；114th, stage clip；
121st, the first lens；122nd, the second lens；133rd, the 3rd lens；
2nd, light reflection module；20th, pentaprism；21st, motor；22nd, electric machine support；
3rd, F-theta lens groups；30th, lens combination；31st, sleeve；32a, sleeve jackscrew；32b, sleeve jackscrew；33rd, sleeve pressure
Spring；34th, sleeve adjustment block；
4th, light harvesting device assembly；40th, optical collector；401st, reflectance coating；402nd, collection window；41st, transflection mirror；42nd, optical filter；43、
PMT；44th, reflecting drum；
5th, Image Plate.
Embodiment
Presently preferred embodiments of the present invention is described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be understood by the person skilled in the art.Herein it should be noted that being used to help for the explanation of these embodiments
Understand the present invention, but do not form limitation of the invention.It is in addition, involved in each embodiment of invention described below
As long as and to technical characteristic each other do not form conflict can be combined with each other.
The present embodiment provides a kind of optical scanner of image-scanning system, and the image-scanning system is used for computer X
Radiography image scan, and optical scanning system of the present invention is the core light department of the Chinese Academy of Sciences for the image-scanning system
Part.
Referring to the drawings shown in 1, the optical scanner is by launching certain wavelength（600-700nm）Laser, in band
Under the servomotor for having tilting mirror drives, Image Plate driven by stepper motors is quickly continuously scanned point by point, and this Image Plate record has
The latent image of dental imaging, certain wavelength can be inspired（350-450nm）Fluorescence, then pass through phosphor collection device（Light harvesting
Device）, by described phosphor collection to PMT, complete signal collection, opto-electronic conversion and A/D conversions.It is latent on Image Plate by being recorded in
As being converted into digital information, and synthesize a width two dimensional image and export to workbench.
In accompanying drawing 1, Image Plate transmission module mainly includes：
Motor #1 and its driving and control circuit #1, described motor #1 can be stepper motor or other can realize fine rotational
Or mobile motor, for driving whole executing agency to drive Image Plate at the uniform velocity to move；The motor driving and control circuit #1,
For driving and controlled motor #1, accurate speed control is realized；
Movement executing mechanism, the executing agency at the uniform velocity move for driving Image Plate to do under motor #1 driving；Image Plate
Geo-stationary can be kept by the form of magnetic, negative pressure, viscous silica gel or compression and executing agency；And
Position sensor and position detecting circuit, described position sensor is by multigroup photoelectric tube or photodiode structure
Into can not only detect whether Image Plate is inserted or removed from scanning means, moreover it is possible to carry out initial zero to every row image scan
Positioning；Described position detecting circuit, for activation point working sensor, and carry out useful signal detection.
The major function of optical scanner is：Start laser to the laser beam for exporting firm power, the light velocity to pass through
After focusing to certain spot size, impinge perpendicularly on Image Plate on the region of some very little, inspire and dive in the region
As the fluorescence signal of the proportional relation of gray value；The fluorescence signal excited is collected by light path, and is turned by opto-electronic conversion, A/D
The step such as change, digital signal streams are converted to by equal proportion；Described laser beam necessarily passes through a specular-reflection unit, the dress
Put can be rotated at a high speed under motor driven, it is achieved that on Image Plate all areas scanning.Referring to the drawings shown in 1, this hair
Bright optical scanner mainly includes：
Laser and laser driving circuit, described laser provide light source, laser output feux rouges, light wave for image scan
Grow between 600nm ~ 700nm, the semiconductor laser using He-Ne laser or specific wavelength may be selected；Described laser
Device drive circuit, constant current driving is provided for laser, and ensure the temperature stability of laser；
Laser adjusts light path, is made up of one group of lens and its supporting construction, for being adjusted to the output light source of laser, really
Protect and project spot size on Image Plate continually and steadily in required scope, for example hot spot should be less than 50 microns；
Motor #2 and motor driving and control circuit #2, described motor #2 is described scan module, for driving laser to adjust
Whole light path, light reflection mirror therein is especially driven to rotate so that laser can continue, evenly circumferentially be scanned；Institute
The motor driving stated and control circuit #2, run, and provide velocity accuracy control for motor #2；
Phosphor collection light path, laser facula are projected on Image Plate relevant position, moment can inspire the glimmering of a wavelength range
Proportionate relationship be present in light, the sub-image information recorded in the intensity and Image Plate of fluorescence；Fluorescence is according to certain angular distribution rule
Outwards scattering, is collected by phosphor collection light path；One group of lens of phosphor collection optical routing or speculum group into, it is therefore an objective to will dissipate
The fluorescence shot out is focused, and is projected in the light collection window of corresponding electrooptical device；And
Electrooptical device and signal acquisition control circuit, for collecting through over-focusing fluorescence signal, and amplify, and in proportion
It is converted into the current signal of some strength；Typically, laser scanning device uses photomultiplier（PMT）Carry out optical signal amplification
With the work of opto-electronic conversion；Signal acquisition control circuit, driving and control on the one hand are provided for electrooptical device, on the other hand
The A/D samplings of electric signal are realized, current signal are converted into data signal, sample rate is set by central controller.
Referring to the drawings shown in 1, network driver block be used to realizing the central control module of scanning means and workbench or
Interconnection between other control platforms, it is easy to workbench to send control parameter and control instruction, and scanning dress to scanning means
Put to workbench transmission view data, work state information and abnormal information；Image processing module, mainly controlled in center
Under the scheduling of module, complete to extract Image Plate latent image information from the signal stream of collection, and be combined into like clockwork
One width two-dimensional rectangular image, described image processing module can integrate with central control module, can also be by independent
Hardware form, such as FPGA, DSP etc.；Each functional module that power module is used for whole scanning system is powered, and voltage does not surpass
24V is crossed, control is powered by central control module；Central control module is used to connecting and controlling each perform function mould in periphery
Block, control the orderly function of whole scanning means, central control unit can be ARM+FPGA platform, can be FPGA+
DSP platform or single FPGA module.
The mechanical structure of optical scanner of the present invention is described in detail 2-10 below in conjunction with the accompanying drawings.Need
Illustrate, be actually whole portions shown in accompanying drawing 3a-3c and accompanying drawing 4a, 6b, 7,9,10 for the ease of observing internal structure
It is the view after 45 ° or 180 ° of sector that part or section components are cut away central angle vertically, for example, Fig. 9, shown in 10
Optical collector is to be cut away the optical collector 40 after the sector that central angle is 45 ° vertically.
Referring to the drawings shown in 2, described optical scanner includes laser beam module 1, light reflection module 2, F-theta
Lens group 3 and light harvesting device assembly 4.Wherein, the generation of laser beam module 1 can produce sweeping for the hot spot of definite shape and size
Light beam is retouched, scanning light beam is reflexed to F-theta lens groups 3, makes what scanning light beam was formed on Image Plate 5 by light reflection module 2
Hot spot is at the uniform velocity moved and flat field scanning can be carried out to Image Plate 5, and scanning light beam is projected on Image Plate 5, forms one surely
The hot spot of metric density, can inspire the fluorescence of a wavelength range moment, and the intensity of fluorescence is believed with the sub-image recorded on Image Plate 5
There is proportionate relationship in breath, fluorescence is outwards scattered according to certain angular distribution rule, is collected by light harvesting device assembly 4.
Referring to the drawings shown in 3a-3c, laser beam module 1 includes the LASER Light Source and light beam set gradually from top to bottom
Lens group is generated, the laser beam of LASER Light Source outgoing is adapted to generate given shape and size through light beam generation lens group
Hot spot laser beam.LASER Light Source is the laser on laser driving circuit 101, e.g., laser diode 102.
Light beam generation lens group includes the first lens 121, the second lens 122 and the 3rd lens 123；Wherein, the first lens 121 are used for
The beam divergence angle for the light beam that laser diode 102 is emitted is adjusted to consistent, is formed rotationally symmetrical taper light beam, specifically may be used
From D type lens；Second lens 122 are used to handle the taper beam collimation, form collimated light beam, and aspheric specifically can be selected
Face lens；3rd lens 123 are used to focus on described collimated light beam, that is, form the scanning light beam of certain focal length, specific optional
Use spherical lens.
Laser diode 102 is located on laser driving circuit 101 especially by a flexible connector, the flexible company
The O-ring 103 of annular can be selected in fitting, its it is flexible and can deformation realize that laser diode 102 and laser drive with this
The soft connection of dynamic circuit 101.Laser driving circuit 101 is arranged on laser mounting seat 104 by connection members such as bolts
On, specific in the present embodiment, the middle part of laser mounting seat 104 offer successively along the vertical direction first step hole 104a,
Second step hole 104c and the 3rd stepped hole 104e, described first step hole 104a, second step hole 104c, the 3rd step
Hole 104e connects successively from top to bottom and three's centerline collineation, wherein, first step hole 104a aperture>Second step hole
104c aperture>3rd stepped hole 104e aperture, so as in first step hole 104a and second step hole 104c joint
A First terrace 104b around second step hole 104c is formed, second step hole 104c's and the 3rd stepped hole 104e
Joint forms a second step face 104d around the 3rd stepped hole 104e；The bottom of at least described O-ring 103 is located at
In the 104a of first step hole and it is stuck on First terrace 104b, laser diode 102 is then located in the 104c of second step hole, by
In O-ring 103 can deformation, thus the lower surface of laser diode 102 and second can be ensured by making the deformation of O-ring 103
Terrace 104d is brought into close contact, and can be met installation accuracy requirement, be ensured laser diode and laser mounting seat center line as far as possible
The depth of parallelism, and then ensure beam primary light line direction, can also reduce from laser diode 102 to laser mounting seat 104
Thermal resistance, be easy to cool；Laser mounting seat 104 is preferably using the good copper seat of thermal conductivity.3rd stepped hole 104e is then positioned at sharp
The underface of optical diode 102, form the diaphragm of corresponding laser diode 102.The first above-mentioned lens 121 are arranged at laser
In mounting seat 104 and positioned at the underface of diaphragm, photosensitive resin or other adhesives can be used to be fixedly connected on laser peace
Fill the intracavitary below the 3rd stepped hole 104e of seat 104.
Laser mounting seat 104 then can be along the optical axis of laser beam module 1（Specifically, above-below direction）Removably mount within
In light source base 105.Specific in the present embodiment, light source base 105 is hollow and offers internal thread, laser mounting seat 104
Lateral wall there is the external screw thread that is engaged, the center line of internal and external threads is parallel or conllinear with the optical axis of laser beam module 1, swashs
Light device mounting seat 104 is located in light source base 105 and passes through screw thread（P=0.5mm）Connection.Laser beam module 1 in the present invention
Light source to the distance of light beam generation lens group is adjustable, that is to say, that passes through rotary laser mounting seat 104, it is possible to achieve
Object distance is finely tuned, and then changes scanning light beam Entry pupil diameters and position.Above-described connected mode is not limited to use certain detail
Pitch thread, the laser mounting seat can also be installed in the light source base by the form of interference fits.
The bottom of light source base 105 can be along the direction of the optical axis perpendicular to laser beam module 1（Specifically, horizontal direction）
Movably it is installed in lens barrel 106, the second lens 122 are arranged in the top of lens barrel 106 and positioned at the lower section of light source base 105.
Specific in the present embodiment, lens barrel 106 is hollow, is arranged at the top of lens barrel 106, lens barrel 106 lower removable of light source base 105
Top is equipped with least one the first jackscrew 107 that can be moved in the horizontal direction, the inner end and light source base of the first jackscrew 107
105 abut, and by turning the first jackscrew 107 light source base 105 can be promoted to move in the horizontal direction.The top of lens barrel 106 can be along water
, specifically can be by the way of grafting, in assembling, first by light source base 105 square to the first wedge 108 is movably provided with
Bottom be placed in the top of lens barrel 106, the first wedge 108 is then fixed on the top of lens barrel 106, the first wedge 108 again
Positioned at the top of the bottom of light source base 105, so as to which the bottom of light source base 105 is limited in into the first wedge 108 and lens barrel 106
Between.Light source base 105 has the first inclined-plane 105a, the inner end of the first jackscrew 107 and one of them first wedge 108
（Specially it is located at the first wedge with the opposite side of the first jackscrew 107）Have respectively the second inclined-plane 107a for being engaged and
108a, the first inclined-plane 105a are brought into close contact all the time with the second inclined-plane 107a and 108a.Between first jackscrew 107 and lens barrel 106
The first elastic component is additionally provided with, such as stage clip 109, for resetting light source base 105, the first elastic component and the first jackscrew 107 are distinguished
Located at the opposite sides of light source base 105, both coordinate driving light source base 105 to move back and forth in the horizontal direction, so as to adjust
The concentricity of light source center and the center line of light beam generation lens group.The lower surface of the light source base and the upper end of the lens barrel
Face keeping parallelism, and then ensure their center line alignment.Insulation spacer is separated between lens barrel and light source base, to ensure to swash
Optical diode is not disturbed by other metal parts impedances.
The bottom of light source base 105 can be along the optical axis of laser beam module 1（Specifically, above-below direction）Movably it is located at light
In beam module bracket, the 3rd lens 123 are arranged at the bottom of lens barrel 106.Specifically, light beam module bracket includes hollow and offered
The inner tube 111 of internal thread, the center line of internal and external threads is parallel or conllinear with the optical axis of laser beam module 1, under light source base 105
External screw thread with matching is offered on the lateral surface in portion, the bottom of light source base 105 connects in inner tube 111 and by screw thread
Connect.The light beam generation lens group of laser beam module 1 and focal plane（Image Plate 5）The distance between be adjustable, pass through rotation
Lens barrel 106 realizes the fine setting of image distance, and then controls spot size.Above-described connected mode is not limited to use specific closely-pitched
Screw thread, the lens barrel can also be installed in said inner tube by the form of interference fits.
Second lens 122 and the 3rd lens 123 are respectively fixedly connected with the opposite end of lens barrel 106（Such as accompanying drawing 3a-3c
In, it is respectively fixedly connected with the upper and lower ends of lens barrel 106）, can specifically be connected by photosensitive resin or other adhesives.
Light beam module bracket also includes body 110, and described inner tube 111 can be along the optical axis that module is restrained perpendicular to laser
Direction（Specifically, horizontal direction）Movably on the body 110.Specifically, body 110 is hollow that inner tube 111 can
Movably it is plugged in body 110 in the horizontal direction, can be movably equipped with the second top in the side wall of body 110 in the horizontal direction
Silk 112, the inner of the second jackscrew 112 and inner tube 111 abut, and by turning the second jackscrew 112, can promote inner tube 111 along water
Square to movement, and then the lens barrel 106 in inner tube 111 is driven to move in the horizontal direction.It can be moved in the horizontal direction on body 110
Ground is provided with the second wedge 113, specifically, in assembling, the upper end of inner tube 111 first can be placed in into this by the way of grafting
In body 110, then the second wedge 113 is fixed in body 110 again, the second wedge 113 is located at the upper end portion of inner tube 111
Lower section, so that the upper end of inner tube 111 is limited between the second wedge 113 and body 110.The upper end of inner tube 111 has
There are the 3rd inclined-plane 111a, the second jackscrew 112 and one of them second wedge 113（Specially it is located at and the second jackscrew 112 is relative
Second wedge of side）Inner end there is the 4th the inclined-plane 112a and 114a that is engaged, the 3rd inclined-plane 111a and the 4th is oblique
112a and 114a are brought into close contact all the time in face.The second elastic component, such as stage clip are provided between inner tube 111 and second wedge 113
114, for resetting inner tube 111, the second jackscrew 112 and the second elastic component are respectively positioned at the opposite sides of inner tube 111, Liang Zhepei
Close driving inner tube 111 to move back and forth in the horizontal direction so that the light beam generation lens group center line and servo of laser beam module 1
The revolution shaft concentricity of motor is adjustable, realizes lens group fine position in the horizontal direction by turning the second jackscrew 112, enters
And ensure light beam on scanning Axisymmetric.
The light beam module bracket is directly mounted on the scan module support of optical scanner, and light beam module branch
The mounting hole of frame and the boss of scan module support are accomplished to be fitted close, to ensure the output shaft concentricity of lens and scan module
Requirement.
The laser beam module 1 of the present embodiment can be realized accurate to the speed axial adjustment of laser diode 102, laser beam
Directly, focus on.Cause optical quality to be deteriorated to eliminate the error of manufacture and installation, also there is adjustment light beam concentricity and as thing
Away from function, so as to realize the optimization to hot spot geometry and size.
Light reflection module 2 comprises at least light reflection mirror, the scan module 21 for driving the light reflection mirror to rotate.This reality
Apply in example, light reflection mirror specifically selects pentaprism 20, and pentaprism 20 is arranged under the 3rd lens 123 of laser beam module 1
Side, scan module 21（The motor #2 addressed above）Pentaprism 20 is driven to rotate so that the scanning that laser beam module 1 generates
Light beam continues, evenly Image Plate 5 is scanned.
Referring to the drawings shown in 4a, F-theta lens groups 3 are arranged in the reflected light path of pentaprism 20, positioned at pentaprism 20
Between light harvesting device assembly 4, it includes being used to make described light beam generate lens group（Specifically, the 3rd lens 123）Produce negative
The lens combination 30 of distortion, described lens combination 30 include an aspherical mirror, can also include three or more than three
Spherical lens, certain barrel distortion is produced with this.Lens combination 30 is designed as image space telecentric optical system, so that scanning light
Beam can perpendicular projection on Image Plate 5.Accompanying drawing 4b provides a kind of instantiation of lens combination 30, with reference to shown in accompanying drawing 4b,
Lens combination 30 includes five spherical lenses M1, M2, M3, M4 and M5, and each spherical lens has two minute surfaces, lens M1,
The curvature and radius of M2, M3, M4 and M5 minute surface can be with identical, can also be different.
The principle of 5 pairs of F-theta lens groups 3 comprising three spherical lenses is described below in conjunction with the accompanying drawings.
For common condenser lens, infinite point object（Directional light）Through the high y of lens imaging and incident angleθTangent
It is directly proportional, i.e.,：
When this lens are used for laser scanning system, due to preferable image height and the non-linear relation of scanning angle, therefore with isogonism
Sweep speed of the incident beam of speed deflection on focal plane is not constant.In order to realize constant-speed scanning, and cause projection
Hot spot at the uniform velocity move, condenser lens should be made（That is, the 3rd described lens 123）Certain barrel distortion is produced, i.e., actual picture
It is highShould be smaller than the preferable image height that geometric optics calculates, corresponding amount of distortion is：
That is there is the lens combination 30 of above-mentioned amount of distortion, its actual image height and scanning angle meet linear relationship：
。
For the traditional optical scanning means not comprising F-theta lens groups 3, then Image Plate 5 needs to bend to certain
Shape, to adapt to the linear relationship between servomotor rotating speed and hot spot translational speed.And the optical scanner of the present invention can
To avoid this defect, realize that flat field scans.
According to another embodiment of the invention, it is saturating only to include first for the light beam generation lens of the laser beam module 1
The lens 122 of mirror 121 and second, without containing the 3rd lens 123, this is due to the lens combination 30 of F-theta lens groups 3 itself
Have the function that to focus on to light beam.
Preferably, with reference to shown in accompanying drawing 4, lens combination 30 can be movably located at along the optical axis direction of F-theta lens groups 3
In one sleeve 31.Specific in the present embodiment, the lateral surface of lens combination 30 is provided with external screw thread, and the medial surface of sleeve 31 is provided with
Matched internal thread, internal thread, externally threaded center line are equal and the optical axis of F-theta lens groups 3 is parallel or conllinear, thoroughly
Mirror system 30 is in sleeve 31 and is connected through a screw thread, and the axial direction of lens combination 30 can be adjusted by relay lens system 30
Position.
Further, sleeve 31 can movably be arranged at scanning electricity along the direction of the optical axis perpendicular to F-theta lens groups 3
On machine support 22, and it can move at least two directions.Specifically, movably it is equipped with least on scan module support 22
Two sleeves jackscrew 31a and 31b, wherein first sleeve jackscrew 31a is moved in the horizontal direction, second sleeve jackscrew 31b edge
Vertical direction moves, and two sleeve jackscrews 31a and 31b the inner abut with sleeve 31 respectively.It is removable on servomotor support 22
The connection side of two sleeve adjustment blocks 34, specially grafting corresponding with two above-mentioned sleeve jackscrews respectively is equipped with dynamicly
Formula, the corresponding sleeve jackscrew of sleeve adjustment block 34 respectively be located at sleeve opposite sides, each sleeve adjustment block 34 and and
Scan module support 22 is respectively equipped with two sleeve stage clips 33, described first sleeve jackscrew 31a and corresponding two set
Cylinder stage clip 33 is located at the opposite sides of sleeve 31, two corresponding sleeve pressures of second sleeve jackscrew 31b volumes respectively
Spring 33 respectively be located at sleeve 31 opposite sides, for make sleeve 31 in the horizontal direction, vertical direction reset.Turn sleeve top
Silk, by the cooperation of two couples of sleeve jackscrew 31a, 31b and sleeve stage clip 33, band moving sleeve 31 moves in horizontal, vertical both direction
It is dynamic, so as to adjust the position of sleeve 31 in 2 directions, and then adjust the position of lens combination 30.Described scan module
21, specially servomotor, it is fixed on described scan module support 22.
Accompanying drawing 6a and 6b show the light harvesting device assembly 4 of a modification of the present invention and its group with F-theta lens groups 3
Close.Referring to the drawings shown in 6a, light harvesting device assembly 4 mainly includes optical collector 40, transflection mirror 41, optical filter 42 and PMT 43（Light
Electric multiplier tube）.Optical collector 40 has collection window 402, and in scanning, the face Image Plate 5 of collection window 402 is in order to by image
The phosphor collection excited on plate 5.Transflection mirror 41 is arranged on the front side of optical collector, and image is projected for passing through laser beam
On plate 5, and the fluorescent reflection of laser collection window 402 will be passed through；Transflection mirror 41 must have less thickness, such as less than 3mm,
The laser of a wavelength range can be passed through, reflectance coating, the fluorescence of energy reflected wavelengths scope are coated with reflecting surface；Transflection mirror 41
It is not limited to, using the total reflection film in a wavelength range, reflection of polarization film can also be used, can passes through and be vibrated in a direction
Light wave.PMT 43 is arranged in the reflected light path of transflection mirror 41, and PMT 43 also has enters window for what fluorescence entered, and this enters
Enter window to be arranged on PMT 43 one end of face transflection mirror 41.Optical filter 42 be arranged on transflection mirror 41 and enter window it
Between, preferably covering is arranged on on window, and the optical filter 42 includes, but are not limited to absorption optical filter, absorption optical filtering
Piece is insensitive to radiation direction, and optical filter 42 preferably is designed into lens, so as to be converged to scattering fluorescence.With reference to attached
Shown in Fig. 6 b, optical collector 40 has phosphor collection chamber, and the phosphor collection chamber connects with described collection window 402, optical collector 40
Also there is an exit portal connected with phosphor collection chamber, the exit portal face PMT's 43 enters window.Optical collector 40
Phosphor collection cavity inner wall is coated with reflectance coating 401, includes, but are not limited to aluminizer, plating silverskin etc..The collection window of optical collector
402 have a relative front-end and back-end, and the section of front end is circular or ellipse, rear end for rectangle or round rectangle, it is and preceding
Seamlessly transitted between end and rear end so that collection window 402 is substantially in duckbill, improves phosphor collection efficiency.Address herein
The noun of locality such as "front", "rear" be using LASER Light Source as reference, in scanning, using the side nearer from LASER Light Source before,
Otherwise after being.It is successively set in optical collector 40 to transflection mirror 41 and the time interval of F-theta lens groups 3, transflection mirror 41 is specific
Before F-theta lens groups 3.
In the example that accompanying drawing 6a and 6b are provided, by the way of piece is entered vertically, i.e. Image Plate 5 vertically at the uniform velocity passes through
Cross collection window 402.The scanning light beam being emitted from pentaprism 20 enters optical collector 40, initially passes through transflection mirror 41 and is projected to F-
Theta lens groups 3, the collection window 402 through the optical collector 40 is projected on Image Plate 5, and forms certain Energy distribution
Hot spot；The hot spot can inspire a wavelength range on the Image Plate 5（Typical peak is 390nm）And distribution form
（It is typically cosine distribution）Fluorescence；The fluorescence inspired is due to certain angle of divergence, therefore chief ray can be through saturating
Anti- mirror 41 enters in the phosphor collection cavity after reflecting, without or by after some secondary reflections from the exit portal of optical collector 40
Project；Then pass through optical filter 42 and entered by entering window in PMT 43, complete opto-electronic conversion, electrical signal gain and A/D and turn
Change.
Accompanying drawing 7 show the schematic diagram of typical light harvesting device assembly 4 in the prior art, it can be seen that the tops of PMT 43 are entered
Enter the collection window 402 of window face optical collector 40, fluorescence is injected from the window that enters of side, and received, conversion, amplification become
Analog electrical signal.Referring to the drawings shown in 6a and 8, the present invention has carried out beneficial improvement, can effectively reduce complete machine Material Cost.
In light harvesting device assembly 4 shown in accompanying drawing 8, the collection window 402 of the side face optical collectors 40 of PMT 43, received using side glimmering
Light, compact structure, the length of whole device can be reduced.
Accompanying drawing 9 shows another light harvesting device assembly 4 of the present invention and the example of F-theta lens groups 3.Itself and accompanying drawing 6b
The example of offer is essentially identical, the difference is that only：PMT 43 uses opposed form, i.e. PMT 43 reflection windows face
The collection window 402 of optical collector 40, although structure is not very compact, due to having cast out transflection mirror 41, therefore laser beam energy
Intact enters F-theta lens groups 3, and scanning accuracy is higher；Reflecting drum 44 is used to connect PMT 43 and F-theta lens groups 3,
Laser beam and the fluorescence excited all pass through from this, and inside needs to plate reflectance coating, are mainly used in collecting fluorescence.
Accompanying drawing 10 shows the 4th kind of light harvesting device assembly 4 of the present invention and the example of F-theta lens groups 3.Referring to the drawings
Shown in 10, Image Plate 5 is horizontal to pass through collection window 402, and collection window 402 is set down, and F-theta lens groups 3 are arranged on collection
The side of light device 40, PMT 43 is arranged on above laser and it is also set down into window, and transflection mirror 41 is arranged on three
Between.By the way of entering piece using the level of Image Plate 5, it can avoid vertically entering as previously described sheet mode because Jin Pian mechanisms exist
Image Plate 5 is driven when moving from top to bottom, it is necessary to before Image Plate 5, the back side by applying thrust come stabilized image plate 5,
The problem of service life that caused may damage Image Plate 5.Laser beam passes through F-theta lens groups 3, through transflection mirror 41
After reflection, it is projected on Image Plate 5；The fluorescence inspired from the Image Plate 5 is received through transflection mirror 41 by PMT 43；It is described
Reflectance coating 401 is all coated with inside optical collector 40；Transflection mirror 41 can be with the laser of reflected wavelengths scope, through certain wavelength model
The fluorescence enclosed；Image Plate 5 is in the presence of self gravitation, without applying thrust in front.
For the image scanner of medical use, the present invention can optimize optical quality, facilitate machine debugging, improve Image Plate
5 service life.The present invention devises diaphragm in laser mounting seat 104 first, to stop the excessive light of the angle of divergence, swashs
Light device mounting seat 104 adds D type lens, and fast axle tentatively can be corrected, by the comparison of the diverging angle modulation of fast and slow axis
It is close, it is modulated after light beam again by the collimation of double non-spherical lenses after, become collimated light beam.In addition, for light source position
Adjustment it is also relatively flexible, it is possible to achieve freely adjusting on 3 directions, be also designed to for the lens barrel 106 of support lens
The movable part that can be freely adjusted on 3 directions, so when adjusting spot diameter, it is possible to directly by changing lens
Position obtains.After this improvement, the circular light spot of comparison rule can be obtained, and the diameter of hot spot can easily be adjusted
Section.
The present invention makes scan mode into flat field scanning, i.e., Image Plate 5 can be with straight shifting by F-theta lens groups 3
It is dynamic, and the holding perpendicular projection that light beam can be more easy to.The defects of traditional bent field scan is brought is overcome, for example reduces Image Plate
5 service life, the design of feeding machine is influenceed, high is required to the placement precision for influenceing plate.
The above embodiments merely illustrate the technical concept and features of the present invention, is a kind of preferred embodiment, and its purpose exists
In allowing person skilled in the art to understand present disclosure and implementing according to this, the guarantor of the present invention can not be limited with this
Protect scope.The equivalent change or modification that all Spirit Essences according to the present invention are made, should all cover in protection scope of the present invention
Within.
Claims (10)
1. a kind of optical scanner of image-scanning system, including light beam generation module, light reflection module and optical collector group
Part, the light beam generation module include laser and generate lens group, the light reflection for generating the light beam of scanning light beam
Module includes being used for light reflection mirror that the scanning light beam reflects and the scanning electricity for driving the light reflection mirror to rotate
Machine, the light harvesting device assembly include optical collector and electrooptical device, and the optical collector, which has, is used for face Image Plate to receive
There is the fluorescence collected for the collection window to enter for the collection window for the fluorescence that collection Image Plate excites, the electrooptical device
Enter window, it is characterised in that：The light harvesting device assembly also includes to make laser light and making the transflection mirror of fluorescent reflection,
The transflection mirror is arranged between the light reflection mirror of the light reflection module and the collection window of the optical collector, the light
Power conversion device is in the reflected light path of the transflection mirror.
2. optical scanner according to claim 1, it is characterised in that：The reflecting surface of the speculum is coated with can be anti-
Penetrate the reflectance coating of fluorescence.
3. optical scanner according to claim 1, it is characterised in that：The collection window of the optical collector has relative
The front end nearer from the laser and rear end from the laser farther out, the section of front end is circular or ellipse, after
End for rectangle or round rectangle, and seamlessly transitted between front-end and back-end.
4. optical scanner according to claim 1, it is characterised in that：The optical scanner also includes being arranged at
F-theta lens groups between the light reflection module and the light harvesting device assembly, the F-theta lens groups include being used to produce
The lens combination of the barrel distortion of raw relatively described light beam generation lens group, the lens combination include aspherical mirror or at least three
Spherical lens, the transflection mirror are arranged between the light reflection mirror and the F-theta lens groups of the light reflection module
Or between the F-theta lens groups and the collection window of the optical collector.
5. optical scanner according to claim 4, it is characterised in that：The F-theta lens groups also include sleeve,
The lens combination can be movably located in the sleeve along the optical axis direction of the F-theta lens groups.
6. optical scanner according to claim 5, it is characterised in that：The sleeve can be along perpendicular to the F-
The direction of the optical axis of theta lens groups is movably arranged on the scan module support of the scan module.
7. optical scanner according to claim 4, it is characterised in that：The light beam generation lens group includes setting successively
Put be used to adjust the beam divergence angle of the light beam of laser emitting to one shows to form rotationally symmetrical taper light beam the
One lens, for forming the second lens of collimated light beam and the 3rd lens for being focused on to light beam to beam collimation；Or,
What the light beam generation lens group included setting gradually is used to adjust the beam divergence angle of the light beam of laser emitting to consistent
To form the first lens of rotationally symmetrical taper light beam and the second lens for forming collimated light beam to beam collimation.
8. optical scanner according to claim 1, it is characterised in that：The laser beam module also includes being used to set
Put the lens barrel of the light beam generation lens group and for the light beam module bracket on scan module support, the lens barrel
Can movably it be arranged in the light beam module bracket along the optical axis of the laser beam module.
9. optical scanner according to claim 8, it is characterised in that：The light beam module bracket includes being used to install
Body on the scan module support of image-scanning system and the inner tube for connecting the lens barrel, the lens barrel can be along institutes
The optical axis for stating laser beam module is movably arranged in said inner tube, and said inner tube can be along perpendicular to the laser beam module
The direction of optical axis be movably arranged on the body.
10. optical scanner according to claim 8 or claim 9, it is characterised in that：The laser beam module also includes setting
In the light source base on the lens barrel, the laser mounting seat in the light source base, the laser is installed on described
In laser mounting seat, the light source base can movably be located at institute along the direction of the optical axis perpendicular to the laser beam module
State on lens barrel, the laser mounting seat can be movably located in the light source base along the optical axis of the laser beam module.
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| CN201710916641.5A CN107608072B (en) | 2017-09-30 | 2017-09-30 | Optical scanning device of image scanning system |
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| CN108490420A (en) * | 2018-06-12 | 2018-09-04 | 深圳市镭神智能系统有限公司 | A kind of micro mirror scanning optics |
| CN110477874A (en) * | 2019-09-25 | 2019-11-22 | 天逸瑞狮（苏州）口腔医疗科技股份有限公司 | Image scanner in a kind of mouth |
| CN110477873A (en) * | 2019-09-25 | 2019-11-22 | 天逸瑞狮（苏州）口腔医疗科技股份有限公司 | Image scanner in a kind of mouth based on silicon photoelectric multiplier |
| CN110568717A (en) * | 2019-09-25 | 2019-12-13 | 天逸瑞狮（苏州）口腔医疗科技股份有限公司 | Light beam adjusting device of image scanning equipment |
| CN111799647A (en) * | 2020-07-06 | 2020-10-20 | 中国人民解放军战略支援部队航天工程大学 | A miniaturized, automatic reciprocating scanning high-power laser |
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| CN110477874B (en) * | 2019-09-25 | 2025-03-04 | 天逸瑞狮（苏州）口腔医疗科技股份有限公司 | An intraoral imaging scanner |
| CN110477873B (en) * | 2019-09-25 | 2025-03-04 | 天逸瑞狮（苏州）口腔医疗科技股份有限公司 | An intraoral imaging scanner based on silicon photomultiplier |
| CN111799647A (en) * | 2020-07-06 | 2020-10-20 | 中国人民解放军战略支援部队航天工程大学 | A miniaturized, automatic reciprocating scanning high-power laser |
| CN111799647B (en) * | 2020-07-06 | 2021-10-12 | 中国人民解放军战略支援部队航天工程大学 | A miniaturized, automatic reciprocating scanning high-power laser |
| CN111965810A (en) * | 2020-08-31 | 2020-11-20 | 桂林市啄木鸟医疗器械有限公司 | Optical path structure of an image scanner and image scanner |
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