CN1216140A - Optical system having increased angular scan range - Google Patents
Optical system having increased angular scan range Download PDFInfo
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- CN1216140A CN1216140A CN 97193800 CN97193800A CN1216140A CN 1216140 A CN1216140 A CN 1216140A CN 97193800 CN97193800 CN 97193800 CN 97193800 A CN97193800 A CN 97193800A CN 1216140 A CN1216140 A CN 1216140A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/003—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/106—Scanning systems having diffraction gratings as scanning elements, e.g. holographic scanners
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10554—Moving beam scanning
- G06K7/10594—Beam path
- G06K7/10683—Arrangement of fixed elements
- G06K7/10702—Particularities of propagating elements, e.g. lenses, mirrors
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Abstract
The invention relates to an optical system (1) comprising a radiation source (3) for supplying a radiation beam, and means for providing the radiation beam with a scanning movement through an angular range DELTA THETA . The light path of the scanning radiation beam incorporates at least one set of two optical interfaces (9, 11). The two interfaces (9, 11) mutually enclose an angle alpha and enclose a material having a refractive index n which is different from that of its surroundings.
Description
The present invention relates to comprise and be used to provide the radiation source of radiation beam and cause radiation beam scanning to move past the optical system of the device of an angular region Δ θ.
The invention still further relates to and be used for the scanning information plane, particularly optics belt recorder, and bar code scanner.
The such optical system that in beginning section, is described can from, for example, U.S. Pat-A 5,333,144, recognize.This patent has been described some embodiment of the optical system that is created on the radiation beam of doing scanning motion in the given angular region.The size of angular region is determined by the wavelength coverage of the radiation that laser instrument can generate.In this system, scanning is moved and is realized with optical means.
Yet, using the described instrument that is used for generating a kind of optical system of scanning beam of this United States Patent (USP), for example in bar code scanner or the laser addressable display board, than with known system obtainable bigger angular region be frequent needs.
The purpose of this invention is to provide a kind of optical system, can make the sweep limit of scanning beam acquisition increase and not make optical system complicated by it.
For this purpose, according to the feature of optical system of the present invention, the light path that is the scanning radiation bundle comprises a combination of at least two optical interfaces, and these two interfaces surround the α angle and wrap into has refractive index n and different material around it.
Optical interface is understood that to refer to from the close transition to optically thinner medium of light, or opposite situation.Usually, optical system is present in the air, so n＞1.
The present invention is based on such understanding, promptly the sweep limit Δ θ of scanning beam can utilize radiation beam on two non-parallel optical interfaces refraction and increase.
When radiation beam incides on the optical interface, will reflect.This refraction uses Si Nieer (Snellius) law to describe usually:
n
iSin (θ
i)=n
oSin (θ
o) n in the formula
iAnd n
oBe respectively the refractive index of the medium of the medium of radiation beams and received radiation bundle.θ
iAnd θ
oBe respectively with respect to the incident angle of interface normal with respect to the emergence angle of this normal.
Under the situation at two interfaces, θ
InBe considered to be in the incident angle on first interface, and θ
OutBe considered to be in second emergence angle on the interface.
At first interface, following formula will be suitable for.
Sin (θ
In)=nSin (θ
m) n is the refractive index of medium between two interfaces in the formula, and n
iBe assumed that 1.θ
mBe emergence angle with respect to first interface normal.
At second interface, following formula will be suitable for:
NSin (α-θ
m)=Sin (θ
Out) if the angle at two interfaces is α.α-θ
mBe exactly the incident angle that records with respect to second interface normal at present.Draw thus
θ
out=arc?Sin[nSin(α-θ
m)]
Like this, the angular region Δ θ of optical system can be increased significantly with respect to given ranges of incidence angles.
It should be noted that for from the close transition to optically thinner medium of light, the incident angle on the interface has a maximum value, is called as critical angle θ
gSurpass this maximum value, the incident beam will not be to be refracted but total reflection takes place at the interface.Work as θ
mBe approximately equal to θ
gThe time, angular region increase to maximum.
Embodiment according to optical system of the present invention is characterised in that the light path of scanning radiation bundle includes first combination and second combination that two optical interfaces are formed, and the interface of first combination surrounds α
1The angle, the interface of second combination surrounds α
2The angle, two combinations are mutually the β angle.
Therefore angular scan range is further increased.
The further advantage that this had is, especially when angle sweep be to carry out wavelength-modulated when being implemented together with grating by means of diode laser, reduce significantly so that the angle sweep that is increased is linear basically by the non-linear quilt of angle sweep that optical grating diffraction obtains.
Another kind of embodiment according to optical system of the present invention is characterised in that system comprises combination and a plurality of reflecting surface of a cover optical interface, and reflecting surface guarantees that scanning beam passes through each interface twice.
By this way, independent enough once the cover interface.Yet each interface is by by twice so that reached with four effects that the interface is same, but light path has been folded, and this helps the compactness of system.
Also has the embodiment that has same advantage according to the another kind of optical system of the present invention in addition, it is characterized in that system comprises the combination of two cover optical interfaces, it is that two covers are total that an interface is wherein arranged, and the system that is also comprises a plurality of reflectings surface in addition, and reflecting surface guarantees that scanning beam passes through other interfaces for twice once by total interface.
Another embodiment according to optical system of the present invention is characterised in that the optical interface of a cover constitutes the part of prism, and the subtended angle of prism (aperture angle) equals two angles that the interface surrounded.
Such element is a kind of simple optical element.So the refractive index of prism material is n.
Characteristics according to the another kind of embodiment of optical system of the present invention are that its optical interface is made of the wall of wedge shape liquid crystal cells.
Liquid crystal material generally also has suitable refractive index to reach desired effect.Can apply an electric field that passes through liquid crystal cells, the result can handle angle sweep in electricity consumption.
The different possibility that obtains scanning beam is arranged.
Be characterised in that according to the embodiment of optical system of the present invention its device comprises a wavelength and selects feedback element, make wavelength shift by feeding back to diode laser from the radiation beam of diode laser by this element; Be that also its device also comprises in addition the dispersion element that a radiation beam that is used to diode laser is generated depends on the refraction of wavelength.
By carving in due course required wavelength components is fed back to diode laser, diode laser will be forced to send the radiation of this wavelength.Can make the wavelength shift of diode laser by the method for guaranteeing to feed back wavelength variations.This can select feedback element to realize by place an adjustable wavelength in the radiation beam of second tube sheet laser instrument.Like this, just obtained the wavelength-modulated of diode laser.Rely on to place a chromatic dispersion element, grating for example, in the modulated beam of wavelength, wavelength-modulated then is converted into angle sweep.
Select the possibility of feedback element and explanation thereof can consult U.S. Pat-A5,333,144 about using adjustable wavelength.
Characteristics according to the another kind of embodiment of optical system of the present invention are, see over from diode laser, its device comprises first grating, second grating and feedback element, and feedback element been separated in a plurality of discrete areas, and wherein at least one is reflective.
First grating is separated into the spectrum component to the beam of radiation source emission, is made them become parallel by second grating before inciding feedback element.Feedback element reflects in a given area at least, this means, because chromatic dispersion, the beam to the wavelength of echo area when only having projection will be fed back to radiation source.This feedback element can be that for example baffle or optical disc or a liquid crystal battle array arrive.
Another kind of embodiment according to optical system of the present invention is characterised in that its this device comprises the rotatable scanning element of a polygon mirror form.
The beam that radiation source is supplied with is incident on the polygon mirror of rotation so that obtain scanning beam with mechanical mode.In this case, the wavelength of the radiation beam that radiation source sent is inoperative.
The invention still further relates to many optical instruments, can be used for wherein bringing very big benefit according to optical system of the present invention.
Consult embodiment described below, these and other situations of the present invention will be explained.
In the accompanying drawings:
Fig. 1 represents the embodiment that has the optical system of two optical interfaces of cover combination according to of the present invention;
Fig. 2 represents the embodiment that has the optical system of two optical interfaces of two covers combination according to of the present invention;
Fig. 3 represents the embodiment of wedge shape liquid crystal cells;
Fig. 4 (a), some embodiment of 4 (b) and 4 (c) expression optical element can make sweep limit obtain and increase by two same degree of interface combinations of two covers by this element;
Fig. 5 represents a kind of embodiment of optical system, can generate scanning beam with it, and can use the present invention therein;
Fig. 6 (a) and 6 (b) represent some curve maps, and their expressions are for the system that a cover interface combinations is arranged, and this interface surrounds 45, θ under the situation of two kinds of different refractivities
OutWith θ
InVariation, also show critical angle θ among the figure
g
Fig. 7 (a) and 7 (b) represent some curve maps, and they show that the optical interface in every cover surrounds 45 for the system of the combination that two cover optical interfaces are arranged, under the situation of two kinds of different beta values, and θ
OutWith θ
InVariation;
Fig. 8 (a) and 8 (b) represent some curve maps, and they show that the optical interface in every cover surrounds 30 ° of angles for the system of the combination that two cover optical interfaces are arranged, under the situation of two kinds of different beta values, and θ
OutWith θ
InVariation;
Fig. 9 represents to have the embodiment of the optical system of rotatable polygonal mirror;
Figure 10 represents to be furnished with the embodiment according to the laser printer of optical system of the present invention;
Figure 11 expresses possibility and is furnished with embodiment according to the visual display instrument of optical system of the present invention;
Figure 12 represents the embodiment of radiation addressable display board; And
Figure 13 represents to be furnished with the optical instrument that is used to read the one or more dimensions bar code according to optical system of the present invention.
The explain through diagrams embodiment of optical system that the scanning radiation bundle with angular scan range Δ θ is provided of Fig. 1.Radiation source 3 may be that for example its radiation beam incides the diode laser on the adjustable wavelength selection feedback element 5.Scalable is understood that here to refer to that the wavelength by the spectrum feedback of diode laser is variable.Feedback element 5 can be, for example has the optical waveguide of the integrated grating of period of change, has the reflecting element of variable reflectivity, electrooptic cell or acousto-optic element.Feedback element can be, for example the part transmission.About the detailed description of the scanning beam system with one of above-mentioned feedback element is provided, U.S. Pat-A5 is provided, 333,144 with as a reference.
Be fed back to the light wavelength of diode laser 3 thereby decide by regulating feedback element.As the result of this feedback, diode laser has generation the radiation of feedback wavelength.By the adjusting of change to feedback element, the wavelength that is fed, thus the wavelength of diode laser emission just can change.Grating 7 is positioned in the feedback element back.By means of grating 7, the different wave length composition is diffracted into different angles.Like this, just can generate scanning beam by wavelength variable second tube sheet laser instrument.In fact, the wavelength-modulated of diode laser is converted into angle sweep.
In according to optical system of the present invention, have at least two optical interfaces 9,11 to be positioned in the light path of scanning beam, these two interfaces are mutually the α angle, and wrap into refractive index n and the different material of medium on every side.Optical interface is understood that to refer to from light close to the transition of optically thinner medium or opposite situation here.Usually, optical system will be present in the air, thereby n＞1.
Like this, just may use scanning by bigger angular region.The available snell law of this result is illustrated: n
iSin (θ
i)=n
oSin (θ
o)
N in the formula
iAnd n
oBe respectively the refractive index of the medium of the medium of radiation beams and received radiation bundle.(θ
i) and θ
oBe respectively with respect to the incident angle of interface normal with respect to the emergence angle of this normal.
When on first interface 9 with respect to the incident angle θ of the normal 13 at this interface 9
InExpression, and on second interface 11 with respect to the emergence angle θ of the normal 15 at this interface 11
OutDuring expression, on first interface, following formula will be suitable for.
Sin (θ
In)=nSin (θ
m) n is the refractive index of medium between two interfaces in the formula, and n
iBe assumed that 1.θ
mFor on first interface with respect to the emergence angle of first interface normal.
On second interface 11, following formula will be suitable for:
NSin (α-θ
m)=Sin (θ
Out) if two interface angulations are α, then α-θ
mIt is exactly now incident angle measured with respect to normal 15 on second interface.
By make up at least one cover wrap into refractive index be different from the light path of scanning beam around the combination at two non-parallel interfaces of medium, the angular region of scanning beam can increase significantly.
Fig. 1 represents that two optical interfaces form the embodiment of the part prism with subtended angle α.Interface 9,11 also can constitute with the wall of the wedge shape liquid crystal cells with subtended angle α.Liquid crystal cells also can be disposable, so that its index of refraction reaches n
LcThereby scan angle can change.
Wedge shape liquid crystal cells itself can from, for example U.S. Pat-A 4,958,914 recognize.
Fig. 2 represents a kind of embodiment of optical system, and wherein one of two prisms is placed on another back.Thereby, four interfaces (9,11) and (17,19) are arranged in this embodiment.The angle of the first class boundary face (9,11) is α
1, and the angle of the second class boundary face (17,19) is α
2Two groups are mutually the β angle.By using two class boundary faces, angular region is optimised by the symmetry that further increases and scan.In addition, if scanning beam converts wavelength-modulated to angle sweep by grating and obtains, then owing to grating diffration, angle sweep will not be linear.By using two groups of non-parallel interfaces, this non-linear can being significantly reduced.
Two prisms or two wedge shape liquid crystal cells, or the combination of a prism and a liquid crystal cells certainly is taken as two class boundary faces and uses.
Fig. 3 represents the embodiment of wedge shape liquid crystal cells 41.Liquid crystal material 43 is present between two optically transparent flat boards 45,47 and has refractive index n
Lc
Shown in embodiment among Fig. 4 (a) and 4 (b), the embodiment that another kind can make angular region increase same degree can only cooperate three reflectings surface 25,27,29 to realize with two non-parallel interfaces 21,23.Beam by interface 21,23 each twice, so its result is suitable with four interfaces.In Fig. 4 (C), only need two reflectings surface 25,27, and the sidewall of the 3rd side of prism or wedge shaped element is used as an optical interface 31.Here, actual combination of using two interfaces of two covers is because of two covers have a total interface.
With the interface together, reflecting surface can constitute optical channel, so light does not lose basically.The advantage of these embodiment is that light path is folded, so optical system can be given compacter form.
Fig. 5 represents the another kind of embodiment of optical system, and it can generate scanning beam and the present invention can be used for wherein and bring very big benefit.Provide radiation beam b to incide on first grating 35 by diode laser 3 through collimation lens 33.The different wave length composition spatially is divided into time beam b by this grating in the beam
1, b3, b
3These beams then incide on second grating 37, and various there wavelength components are deflected different angles, therefore obtain a parallel-beam b '.This parallel-beam b ' incides on the feedback element 39, and this element is separated into many discrete areas 51, and wherein at least one is reflective.The wavelength components that only is incident on the usable reflection zone will instead be arrived diode laser.Diode laser will be forced by this feedback and generate the light with this wavelength.By changing the position in usable reflection district, just can obtain scanning beam.Scanning beam can couple out on second grating 37.This can obtain in the zero level transmission for the grating 37 of the utmost point of grating 35, if grating 37 is for example 50% reflection and 50% transmission.But then, this beam also can couple out in reflection, for example as the zero level of grating 37.This of interface or these combination is arranged in the scanning beam that system shown in Figure 5 provides continuously.
In according to optical system of the present invention, having angle is 45 °, and the medium refractive index that wraps into is a cover interface combinations of 1.53, and the variation that incident angle is 10 ° can make the variation of emergence angle increase to 24 °.
Fig. 6 (a) and 6 (b) represent the θ for two kinds of different refractivities of two materials that optical interface wraps into respectively
OutWith θ
InChange figure line.The angle at two interfaces is 45 °.Critical angle θ
gAlso show in the drawings.
Fig. 7 (a) and 7 (b) represent some curve maps, show α among the figure
1=α
2=45 °, two kinds of different beta values according to the variation of the emergence angle of optical system of the present invention with incident angle.This optical system has four optical interfaces.
Fig. 8 (a) and 8 (b) expression are to two kinds of different beta values, and α
1=α
2=30 ° figure line.
In optical system shown in Figure 9, scanning beam generates with mechanical means.For this reason, system comprises provides the radiation source of scanning beam b detection part 71 and rotating polygon mirror 73, and the reflection of this polygon mirror is for example parallel, and beam is to can be with beam focusing to the object lens 75 of point of irradiation.Polygonal mirror comprises, for example, and ten little minute surface f
1-f
10, they are such as the rotating shaft that is parallel to polygon mirror.In operating process, this polygonal mirror rotates along arrow 77 indicated directions.Each little minute surface forwards in the range of beam, schemes medium and small minute surface f
2, will make beam move past the entrance pupil of object lens along arrow 79 indicated directions.Optical system as described herein is used in the optical instrument for the banded record carrier of scanning especially.
Can be applied in many optical instruments according to optical system of the present invention and bring very big benefit.
Figure 10 represents the principle of laser printer 81.In such printer, at first on light-sensitive layer, write by scanning laser beam.Then, laser-sensitive layer moves through ink paths, thereby will scheme to beat on paper.Light-sensitive layer 93 can be wound on the cylinder 95, and in order to describe continuous lines, cylinder is 97 rotations around the shaft.Line sweep can by means of, for example, have six the little minute surface f and the polygon mirrors 99 of 101 rotations around the shaft, or grating is realized.Reference number 103 expression object lens are for example assembled by radiation source 105, as high-power diode laser institute radiation emitted, and by the lens of little direct reflection point of irradiation V to the medium 93.Intensity of laser beam flows through the electric current of diode laser by adjusting or by means of independently, for example acousto-optic or electrooptic modulator 107 are adjusted to accord with and wait to record the information of writing.In order to detect the position of polygon mirror on six-freedom degree, instrument configuration has position detecting system 109.Here be still,, can between element that causes beam scanning and light-sensitive layer, settle two or four interfaces in order to increase the sweep limit of scanning beam.
The wiring diagram of Figure 11 presentation image display instrument 111, image is by reflective radiosensitive in this instrument, promptly radiation addressable display board 113 generates.The advantage of this plate in image projection's instrument is described in European patent application EP 0517517.Compare with general active matrix board, the advantage of radiation addressable plate is that it can provide high optical efficiency, because do not need to provide electronic switch matrix and conductive electrode to the plate face, and because this plate absorbed radiation not in fact.
Figure 12 represents the structure of radiation addressable plate 113.Writing beam 115 1 sides from record sees over, it contains first transparent substrates 117, transparent conductive layer 119, for example make by indium tin oxide (ITO), in dark situation, have high resistance and when exposure, have good electrical to lead, for example form by silicon, photoconductive layer 121, may also have light shield layer 123, reflector layer 125 for example comprises one group of dielectric layer with quarter-wave thickness, first oriented layer 127,131, the second transparency conducting layers 133 of 129, the second oriented layers of liquid crystal material layer and second transparent substrates 135.
The record that this piece plate is sent by parts 139 is write beam by the scanning of row preface, and these parts comprise radiation source, for example laser instrument, with the beam shaping optical system, and information to be shown, as vision signal, be adjusted to and accord with this information thereby be applied on the formation system intensity of laser beam.Laser beam 137 is incident on the atwirl polygon mirror 141, and is incident on then that low speed moves and such as on second scanning element 143 that is made of the level crossing of vibration or second polygon mirror.Scanning element 143 makes beam towards plate 113 reflections.Polygon mirror 141 reflects the beam 137 of convergence in such a way so that the point of irradiation that forms is described straight line on the light-sensitive layer of plate 113.Second scanning element 143 guarantees that point of irradiation moves more slowly on second direction perpendicular to this rectilinear direction.The light-sensitive layer of plate 113 thereby scanned two-dimensionally, and the two-dimensional matrix of pixel is write out in record.The application of polygon mirror write the beam scanning display board with record aspect can be recognized from the english abstract of Japanese patent application 62-56931.Grating can replace polygon mirror to be used as scanning element.As mentioned above, can further increase the sweep limit of beam at two or four optical interfaces of scanning element 143 back arrangement.
As shown in figure 11, the plate 113 that has an addressing system can be used for image projector.This instrument configuration has the illuminace component that comprises radiation source 151 and beam shaping optical system 153, and these parts provide illumination radiation.This beam comes illuminatian plate 113 by Polarization-Sensitive beam splitter 155.The visual imaging that dependence will be formed onboard by the beam and the projecting lens 157 of plate reflection is on projection screen 159.
The addressable plate that has addressing system can be used to look at straight instrument with being replaced, by observer's Direct observation plate.
Comprise the graphical presentation system that the scanning device with the scanning element that increases sweep limit can be used to be called as laser television in addition, projection screen can directly be write on or on wall, by its image as moving by means of three laser beam under the situation of scanning laser beam or color image.Laser television exists, and for example is described in the european patent application 0374857.
The present invention also can be used for smear camera, particularly infrared camera, and landscape or object are moved by the formed image of object lens and pass through one or delegation's detecting device therein.This camera exists, and U.S. Pat-A3 for example is described in 706,484.Scanning element, for example atwirl polygon mirror or grating are used to make image move through detecting device by the row preface.The present invention also can be used for realizing bigger sweep limit once more.
As described above machinery the two all can be applicable to in the check processing or the instrument used of the article after the processing or workpiece with non-mechanical scanning device, or for reading number, as the bar code on the article, the instrument of usefulness, so the present invention also can be used for these instruments.
Figure 13 represents to be used to read the embodiment of the instrument of one or more dimensions bar code.The example of these yards is the bar code of one dimension and the some type sign indicating number of two dimension.The beam b scioptics 163 that provided by diode laser 161 are incident on the mirror 165.Magnet 167 is positioned in the rear of mirror 165, and it makes catoptron 165 do vibration together with the coil 169 that is driven by current source 171.The scanning beam of Sheng Chenging then is incident on the bar code 173 in this way.According to optical system of the present invention, comprise the combination at a cover or two non-parallel interfaces of two covers, be positioned between catoptron 165 and the bar code 173.This figure only expresses a cover interface (9,11).
Claims (15)
1. comprise and be used to provide the radiation source of radiation beam and be used to cause radiation beam scanning to move past the optical system of the device of angular region Δ θ, it is characterized in that including in the light path of scanning radiation bundle the combination of two optical interfaces of at least one cover, two interfaces are mutually the α angle and wrap into to have refractive index n and is different from material around it.
2. the optical system of claim 1 is characterized in that including the combination of first cover and two optical interfaces of second cover in the light path of scanning radiation bundle, and the interface of first cover becomes α
1The interface of angle, second cover becomes α
2The angle, and two covers are mutually the β angle.
3. the optical system of claim 1 is characterized in that system comprises combination and a plurality of reflecting surface of two optical interfaces of a cover, and reflecting surface guarantees that scanning light beam passes through each interface twice.
4. the optical system of claim 1 is characterized in that system comprises two cover optical interfaces, and one of them interface is that two covers are total; The system that also is also comprises a plurality of reflectings surface in addition, and reflecting surface guarantees that scanning beam passes through other interfaces once through twice at total interface.
5. claim 1,2,3 or 4 optical system is characterized in that the part that constitutes prism of two optical interfaces of a cover, and the subtended angle of this prism equals the angle at two interfaces.
6. claim 1,2,3 or 4 optical system is characterized in that optical interface is made up of the wall of wedge shape liquid crystal cells.
7. the optical system of above-mentioned arbitrary claim, wherein radiation source is a diode laser, it is characterized in that this device comprises wavelength and selects feedback element, with it by feeding back to diode laser, wavelength from the radiation beam of diode laser is variable, and its characteristics are that also this device also comprises the radiation beam that is used to diode laser is generated in addition and depends on the dispersion element that wavelength reflects.
8. the optical system of arbitrary claim in the claim 1 to 6, wherein radiation source is a diode laser, it is characterized in that seeing over from diode laser, this device comprises first grating, second grating and feedback element, feedback element is split into a plurality of discrete areas, and wherein at least one is reflective.
9. the optical system of arbitrary claim in the claim 1 to 6 is characterized in that this equipment comprises the rotation sweep element that is the polygon mirror form.
10. be used for the optical instrument of electromagnetic scanning medium at least in one direction, it is characterized in that this instrument configuration has the optical system of aforementioned arbitrary claim.
11. be used on radiation-sensitive layer by threadlike graph record write signal and the optical instrument that provides record to write the device of beam and be used to regulate the device that this beam is consistent with write information to be recorded be provided, it is characterized in that the have the right optical system of arbitrary claim in the requirement 1 to 9 of this instrument configuration.
12. be used for the optical instrument that the reflective display panel that disposes photoconductive layer is write in electromagnetism record, it is characterized in that the have the right optical system of arbitrary claim in the requirement 1 to 9 of this instrument configuration.
13. be used for image being write on projection screen or having the lip-deep optical instrument of such function, it is characterized in that the have the right optical system of arbitrary claim in the requirement 1 to 9 of this instrument configuration by the form of threadlike graph.
14. be used for image conversion is become electric signal, and wherein medium is the optical instrument of radiation-sensitive detector, it is characterized in that the have the right optical system of arbitrary claim in the requirement 1 to 9 of this instrument configuration.
15. be used to read the optical instrument of one or more dimensions bar code, it is characterized in that the have the right optical system of arbitrary claim in the requirement 1 to 9 of this instrument configuration.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96203710.7 | 1996-12-24 | ||
| EP96203710 | 1996-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1216140A true CN1216140A (en) | 1999-05-05 |
Family
ID=8224767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97193800 Pending CN1216140A (en) | 1996-12-24 | 1997-12-04 | Optical system having increased angular scan range |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0891620A1 (en) |
| JP (1) | JP2000507004A (en) |
| CN (1) | CN1216140A (en) |
| WO (1) | WO1998028736A1 (en) |
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| CN109557702A (en) * | 2018-12-25 | 2019-04-02 | 江苏慧光电子科技有限公司 | Photoelectric scanner |
| CN110100204A (en) * | 2016-12-23 | 2019-08-06 | 徕卡显微系统复合显微镜有限公司 | For influencing the optical arrangement system and method for the beam direction of at least one light beam |
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| JP4639691B2 (en) * | 2004-08-06 | 2011-02-23 | セイコーエプソン株式会社 | Optical scanning device and image display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61209418A (en) * | 1985-03-13 | 1986-09-17 | Hitachi Ltd | Prism optical system and optical information processor using said system |
| JPH0693044B2 (en) * | 1985-03-22 | 1994-11-16 | 株式会社日立製作所 | Prism optical system and information device using the same |
| DE69123523T2 (en) * | 1990-09-13 | 1997-04-24 | Canon Kk | Optical head for magneto-optical recording / playback device |
| US5237457A (en) * | 1990-10-04 | 1993-08-17 | Asahi Kogaku Kogyo Kabushiki Kaisha | Apparatus for adjusting an optical axis including a laser beam source and a beam shaping prism |
| US5477386A (en) * | 1991-07-24 | 1995-12-19 | Asahi Kogaku Kogyo Kabushiki Kaisha | Optical system for optical disc apparatus including anamorphic prisms |
| EP0550929B1 (en) * | 1991-12-30 | 1997-03-19 | Koninklijke Philips Electronics N.V. | Optical device and apparatus for scanning an information plane, comprising such an optical device |
-
1997
- 1997-12-04 CN CN 97193800 patent/CN1216140A/en active Pending
- 1997-12-04 WO PCT/IB1997/001520 patent/WO1998028736A1/en not_active Application Discontinuation
- 1997-12-04 EP EP97913371A patent/EP0891620A1/en not_active Withdrawn
- 1997-12-04 JP JP10528576A patent/JP2000507004A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107750342A (en) * | 2015-05-06 | 2018-03-02 | 通快激光有限责任公司 | Angle cubes reflector |
| CN107750342B (en) * | 2015-05-06 | 2021-06-22 | 通快激光有限责任公司 | Corner cube type reflector |
| CN110100204A (en) * | 2016-12-23 | 2019-08-06 | 徕卡显微系统复合显微镜有限公司 | For influencing the optical arrangement system and method for the beam direction of at least one light beam |
| CN110100204B (en) * | 2016-12-23 | 2023-05-09 | 徕卡显微系统复合显微镜有限公司 | Optical arrangement system and method for influencing the beam direction of at least one light beam |
| CN108732744A (en) * | 2018-05-07 | 2018-11-02 | 王念 | A kind of MEMS tunable optical filters |
| CN109557702A (en) * | 2018-12-25 | 2019-04-02 | 江苏慧光电子科技有限公司 | Photoelectric scanner |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0891620A1 (en) | 1999-01-20 |
| JP2000507004A (en) | 2000-06-06 |
| WO1998028736A1 (en) | 1998-07-02 |
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